somatotroph is one of those subjects where the details matter more than the headlines. This page pulls together the background, the mechanisms, and the practical points readers ask about most.
Last reviewed on 2025-11-04. Where a claim depends on a specific study, the study is described rather than over-claimed.
稳定性研究通常考察温度、光照、湿度和 pH 对肽链的影响。冻干粉在低温避光条件下较为稳定，复溶后则需控制保存时间并避免反复冻融。肽类可能发生氧化、脱酰胺、水解和聚集，这些变化会改变色谱纯度。强制降解实验用于识别主要降解途径并验证分析方法的专属性。
质量控制项目一般包括外观、身份、纯度、含量、有关物质、水分和微生物限度。身份确认可通过肽图谱、氨基酸分析和质谱完成，纯度则用面积归一化法计算。研究级材料与药品级材料的要求不同，前者常缺少完整药典验证。不同批次间杂质谱是否影响活性，仍是一个需要具体数据回答的问题。
特沙莫瑞林的检测通常依赖反相高效液相色谱和质谱联用。反相色谱可分离肽主峰与缺失序列、氧化产物等杂质，质谱则提供精确质量以确认身份。对于复杂基质中的定量，常采用液相色谱-串联质谱，并配合固相萃取或蛋白沉淀。生物样品中的肽易降解，因此采集和处理条件会影响结果。
Tesamorelin is a synthetic peptide of forty-four amino acids whose sequence reproduces human growth hormone-releasing hormone. Its distinguishing feature sits at the amino terminus, where a trans-3-hexenoyl group replaces the free amine. That acylation slows cleavage by dipeptidyl peptidase IV, an enzyme that otherwise removes the first two residues and inactivates the natural hormone quickly. The modified peptide therefore persists longer in circulation while keeping the same receptor target. It is handled as a lyophilized solid and dissolved shortly before use.
Signaling begins at the GHRH receptor, a class B G protein-coupled receptor displayed on somatotroph cells of the anterior pituitary. Receptor occupancy activates Gs proteins, which raise adenylyl cyclase activity and intracellular cyclic AMP, in turn driving protein kinase A dependent pathways. The downstream output is synthesis and pulsatile secretion of growth hormone into the bloodstream. Hepatic tissue and peripheral sites respond by increasing insulin-like growth factor 1 production. Somatostatin and IGF-1 itself supply negative feedback that caps the size and duration of each secretory burst.
| Property | Value | Notes |
|---|---|---|
| 外观 | 白色至类白色冻干粉 | 可能具吸湿性 |
| 溶解性 | 溶于水和水性缓冲液 | 典型肽类行为 |
| 冻干粉储存 | -20°C 或 2-8°C，避光 | 长期稳定性较好 |
| 复溶后储存 | 2-8°C，短期 | 避免反复冻融 |
| 常用分析 | RP-HPLC 与 LC-MS | 纯度与身份确认 |
Stimulated growth hormone release leads to hepatic production of insulin-like growth factor 1, a key mediator of many growth hormone effects. In clinical studies, tesamorelin increased IGF-1 levels in a dose-dependent manner, although the response varies among individuals. The drug's effect on visceral fat is thought to involve growth hormone-mediated lipolysis and altered adipocyte metabolism. Muscle mass and lean body mass have also been assessed as secondary outcomes, but changes are generally smaller and less consistent than fat reductions.
Pharmacodynamic studies show that tesamorelin reduces visceral adipose tissue more than subcutaneous adipose tissue in the studied population. This selectivity may relate to differences in blood flow and hormone sensitivity between fat depots. Effects on glucose metabolism and insulin sensitivity have been investigated, with some trials reporting modest changes and others showing stability. The precise relationship between growth hormone exposure, IGF-1 levels, and visceral fat loss remains an active area of analysis.
Tesamorelin binds to growth hormone-releasing hormone receptors on somatotroph cells in the anterior pituitary. Receptor activation increases intracellular cyclic AMP and promotes synthesis and secretion of growth hormone. Because the peptide mimics endogenous GHRH, it amplifies the normal pulsatile release of growth hormone rather than providing exogenous growth hormone directly. This upstream action distinguishes tesamorelin from recombinant growth hormone preparations and from growth hormone secretagogues that act at different receptors.
Physicochemical behavior is dominated by the peptide backbone. The molecule is hydrophilic and carries a net positive charge near neutral pH, owing to several arginine and lysine residues. In solution it adopts a largely unstructured conformation, and aggregation is a known concern for peptide products of this size. Oxidation of methionine and deamidation of asparagine or glutamine residues are the principal chemical degradation routes. These liabilities shape how the material is formulated, handled, and analyzed, and they explain why lyophilized presentations are common in research settings.
Tesamorelin is a synthetic peptide analog of growth hormone-releasing hormone, built from 44 amino acids. Its sequence follows the natural human GHRH(1-44) backbone, with a trans-3-hexenoyl group attached to the N-terminal tyrosine. This modification blocks recognition by dipeptidyl peptidase IV, the enzyme that rapidly truncates the native hormone in circulation. The result is a molecule with a substantially longer plasma residence time than unmodified GHRH, which makes it practical for clinical and laboratory study.
Receptor-level activity begins when the peptide binds the GHRH receptor, a class B G-protein-coupled receptor found on pituitary somatotroph cells. Occupancy triggers Gs-mediated activation of adenylyl cyclase and a rise in intracellular cyclic AMP, which in turn promotes synthesis and pulsatile release of growth hormone. Because the compound acts upstream of the growth hormone axis rather than supplying hormone directly, its effect depends on intact pituitary function. Binding studies in cell culture and animal models have established this pathway; the detailed kinetics of receptor recycling in humans remain less well characterized.
Whether the drug improves hard clinical outcomes is not settled. No completed trial has shown a reduction in heart attacks or strokes among treated patients, although a dedicated cardiovascular outcomes study has been discussed in the literature. Investigators have also examined hepatic fat in people with HIV and fatty liver disease, cognitive measures in small cohorts, and changes in bone density. Regulatory labeling emphasizes monitoring of insulin-like growth factor 1 because supraphysiologic levels raise questions about tissue growth, and the clinical significance of that signal remains an open question rather than a demonstrated harm.
Binding of tesamorelin to the growth hormone-releasing hormone receptor on anterior pituitary somatotrophs activates a Gs protein pathway, raises cyclic AMP, and triggers release of stored growth hormone into the bloodstream. Because the analogue resists dipeptidyl peptidase-4, its plasma residence time exceeds that of native GHRH, producing a larger and more sustained secretory signal. The released growth hormone then acts on the liver and peripheral tissues to raise insulin-like growth factor 1, which feeds back on the hypothalamus and pituitary. This axis explains both the intended effects on fat distribution and the biological markers used to track them.
The hexenoyl cap slows the enzyme step that trims the amino terminus of native GHRH, the same step that shortens its active lifetime in circulation. As a result, the modified peptide persists longer in plasma than the unmodified hormone in side-by-side comparison. Receptor activity stays broadly comparable, because the added group sits away from the residues that contact the binding site. This combination, preserved receptor activity with reduced degradation, explains why the analog was developed instead of the native sequence.
Several compounds share the GHRH framework, including sermorelin, the shorter 1-29 fragment, and other analogs built on the full 1-44 chain. Naming follows a common convention: a stem that identifies the peptide plus a suffix marking analog status. Reports may describe tesamorelin by its sequence fragment, as a GHRH(1-44) analog, or by its amino-terminal modification. Indexing the compound therefore requires searching all of these forms, since some older literature predates the current international nonproprietary name.
Tesamorelin is a synthetic peptide built from 44 amino acids and classified with the growth hormone–releasing hormone family. Its sequence corresponds to the human GHRH(1-44) backbone, carrying one structural change at the amino terminus. That change is a trans-3-hexenoyl group placed where the natural peptide would have an unmodified end. The modification is the feature that separates the compound from the endogenous hormone in name, in stability, and in how it is handled in the laboratory.
== Distribution == Despite the name, none of the Periplaneta species is native to the Americas; P. americana was introduced to what is now the United States from Africa as early as 1625. They are now common in tropical climates because human activity has extended the insects' range of habitation, and are virtually cosmopolitan in distribution as a result of global commerce.
== History == The first 15 years of the EIP focused on establishing vaccination schedules and ensuring that poorer countries had a supply of vaccines. In 1974, only 5% of children in low-income countries and 21% of all children received basic vaccines. DTP3 coverage increased from 20% in 1982 to 76% in 1990. (DTP3 refers to the third shot of the DTP vaccine. DTP3 completion rates in one-year-olds is used as a proxy for infant vaccination completion rates.) The growth was fueled by Child Survival and Development Revolution initiated by Jim Grant in UNICEF. After the sharp increase in vaccination rates, the growth has slowed to a halt because the most of the remaining infants live in places where the cold chain for vaccine storage is unreliable. In response the EPI broadened its scope and introduced more vaccines (HepB, Hib, PCV) into schedules. This expands the spectrum of protection for kids with access to vaccines. The GAVI was founded in 2000, providing funding for expanding vaccine access in poorer countries. The DTP3 completion rate was 83% by 2010. Technical innovations such as the solar-powered refrigerator and the vaccine vial monitor played a large role in gaining the 7 percentage points. In the one-and-a-half decades after 2010, the EPI saw major achievements including the appearance and endorsement of rotavirus, HPV, and malaria vaccines. The rotavirus vaccine greatly reduced women and child mortality due to diarrhea; the HPV vaccine had already made a dent in the number of cervical cancer cases; and the malaria vaccine too has saved lives.
=== Multi-model approach === Culture and ethnicity provide an environment where trust and communication between criminals can be efficient and secure. This may ultimately lead to a competitive advantage for some groups; however, it is inaccurate to adopt this as the only determinant of classification in organized crime. This categorization includes the Sicilian Mafia, 'Ndrangheta, ethnic Chinese criminal groups, Japanese yakuza (or Boryokudan), Colombian drug trafficking groups, Nigerian organized crime groups, Corsican mafia, Korean criminal groups and Jamaican posses. From this perspective, organized crime is not a modern phenomenon - the construction of 17th and 18th century crime gangs fulfill all the present day criteria of criminal organizations (in opposition to the Alien Conspiracy Theory). These roamed the rural borderlands of central Europe embarking on many of the same illegal activities associated with today's crime organizations, with the exception of money laundering. When the French revolution created strong nation states, the criminal gangs moved to other poorly controlled regions like the Balkans and Southern Italy, where the seeds were sown for the Sicilian Mafia – the linchpin of organized crime in the New World.
Sources: en.wikipedia.org
== Medical uses == Sertraline has been approved for major depressive disorder, obsessive–compulsive disorder (OCD), post-traumatic stress disorder (PTSD), premenstrual dysphoric disorder, panic disorder, social anxiety disorder (SAD), and generalized anxiety disorder (GAD). Sertraline is approved for use in children with OCD.
== Medical use == According to phase III randomized trials, a cangrelor–clopidogrel combination is safe and has been found to be more effective than standard clopidogrel treatment at reducing ischemic events in the heart, without increasing major bleeding in the treatment of stenotic coronary arteries. The advantages of this drug combination are most prominent in patients with myocardial infarction. Available antiplatelet drugs have delayed onset and offset of action. Since cangrelor's effects are immediate and quickly reversed, it is a more desirable drug for elective treatment of stenotic coronary arteries, high risk acute coronary syndromes treated with immediate coronary stenting, and for bridging those surgery patients who require P2Y12 inhibition. Evidence regarding cangrelor therapy is limited by the lack studies assessing cangrelor administration in conjunction with either prasugrel or ticagrelor. Cangrelor been approved for adults undergoing percutaneous coronary intervention (PCI).
There have been increasing public calls for global collective action to address the threat, including a proposal for an international treaty on antimicrobial resistance. Further detail and attention is still needed to recognize and measure trends in resistance on the international level; the idea of a global tracking system has been suggested but implementation has yet to occur. A system of this nature would provide insight to areas of high resistance as well as information necessary for evaluating programs, introducing interventions and other changes made to fight or reverse antibiotic resistance.
=== Circulating angiogenic cell === A similar method is to culture the peripheral blood mononuclear fraction in supplemented endothelial growth medium, removing the non-adherent cells, and isolating the remaining. While these cells display some endothelial characteristics, they do not form colonies.
Sources: en.wikipedia.org
On April 24, 2025, during the first Armenian Genocide Remembrance Day of Trump's second term, the White House issued a statement commemorating the day that did not use the term "genocide". This was seen as a reversal after Joe Biden formally recognized the Armenian genocide in 2021. The second Trump administration continues to avoid using the term "genocide", instead continuing to refer to the events as the Medz Yeghern (Armenian for 'Great Catastrophe') and labeling April 24 as only "Armenian Remembrance Day". On August 8, 2025, Armenian prime minister Nikol Pashinyan and Azerbaijani president Ilham Aliyev signed a peace agreement in a ceremony hosted by President Donald Trump in the White House, aiming to end the more than 35-year conflict between Armenia and Azerbaijan.
Atherosclerosis, formerly considered a lipid storage disorder, is now understood as a chronic inflammatory condition involving the arterial walls. Research has established a fundamental role for inflammation in mediating all stages of atherosclerosis from initiation through progression and, ultimately, the thrombotic complications from it. These new findings reveal links between traditional risk factors like cholesterol levels and the underlying mechanisms of atherogenesis. Clinical studies have shown that this emerging biology of inflammation in atherosclerosis applies directly to people. For instance, elevation in markers of inflammation predicts outcomes of people with acute coronary syndromes, independently of myocardial damage. In addition, low-grade chronic inflammation, as indicated by levels of the inflammatory marker C-reactive protein, prospectively defines risk of atherosclerotic complications, thus adding to prognostic information provided by traditional risk factors, such as LDL levels. Moreover, certain treatments that reduce coronary risk also limit inflammation. Notably, lipid-lowering medications such as statins have shown anti-inflammatory effects, which may contribute to their efficacy beyond just lowering LDL levels. This emerging understanding of inflammation's role in atherosclerosis has had significant clinical implications, influencing both risk stratification and therapeutic strategies.
Naval Postgraduate School academic Edward A. Olsen, British politician David Alton, York University professor Hyun Ok Park, and University of Southern California professor David C. Kang used the term to refer to tensions between North Korea and South Korea, which have been divided since the end of World War II in 1945. They interchangeably called it the "Korean Cold War". In August 2019, the North Korean government said that further US–South Korean military cooperation would prompt North Korea to "trigger a new cold war on the Korean Peninsula and in the region." China's Defense Ministry spokesman Geng Yansheng, The Diplomat editor Shannon Tiezzi, and The Guardian columnist Simon Tisdall used the term to refer to tensions between China and Japan.
Miso: A fermented soybean paste that is a cornerstone of Japanese cuisine. Its production involves combining koji (usually rice-based) with cooked soybeans and salt, followed by fermentation for weeks or even years. Enzymes in the koji break down complex proteins and carbohydrates in the soybeans, creating miso's rich and nuanced flavor. The fermentation time, type of koji, and additional ingredients all contribute to a wide variety of miso types, from sweet white miso to robust red miso. Miso adds depth and complexity to dishes such as soups, stews, marinades, and sauces. Sake: In sake production, koji converts rice starch into fermentable sugars. Unlike beer brewing, where saccharification and fermentation occur sequentially, sake brewing integrates these stages in a parallel fermentation environment. This dynamic interplay contributes to sake's unique flavor profile. Koji not only facilitates starch conversion but also develops nuanced aromas and flavors in the final product. Soy Sauce: A fermented condiment derived from soybeans and wheat, with koji initiating enzymatic breakdown. Koji is cultivated on roasted wheat and soybeans and then mixed with salt water to create a brine called moromi, which ferments for months. Koji enzymes break down proteins and starches, contributing to soy sauce's umami flavor. After fermentation, the moromi is pressed, pasteurized, filtered, and bottled.
=== EC 2.1.1: Methyltransferases === EC 2.1.1.1: nicotinamide N-methyltransferase EC 2.1.1.2: guanidinoacetate N-methyltransferase EC 2.1.1.3: thetin—homocysteine S-methyltransferase EC 2.1.1.4: acetylserotonin O-methyltransferase EC 2.1.1.5: betaine—homocysteine S-methyltransferase EC 2.1.1.6: catechol O-methyltransferase EC 2.1.1.7: nicotinate N-methyltransferase EC 2.1.1.8: histamine N-methyltransferase EC 2.1.1.9: thiol S-methyltransferase EC 2.1.1.10: homocysteine S-methyltransferase EC 2.1.1.11: magnesium protoporphyrin IX methyltransferase EC 2.1.1.12: methionine S-methyltransferase EC 2.1.1.13: methionine synthase EC 2.1.1.14: 5-methyltetrahydropteroyltriglutamate—homocysteine S-methyltransferase EC 2.1.1.15: fatty-acid O-methyltransferase EC 2.1.1.16: methylene-fatty-acyl-phospholipid synthase EC 2.1.1.17: phosphatidylethanolamine N-methyltransferase EC 2.1.1.18: polysaccharide O-methyltransferase EC 2.1.1.19: trimethylsulfonium—tetrahydrofolate N-methyltransferase EC 2.1.1.20: glycine N-methyltransferase EC 2.1.1.21: methylamine—glutamate N-methyltransferase EC 2.1.1.22: carnosine N-methyltransferase EC 2.1.1.23: now covered by EC 2.1.1.124, EC 2.1.1.125 and EC 2.1.1.126 EC 2.1.1.24: now covered by EC 2.1.1.77, EC 2.1.1.80 and EC 2.1.1.100 EC 2.1.1.25: phenol O-methyltransferase EC 2.1.1.26: iodophenol O-methyltransferase EC 2.1.1.27: tyramine N-methyltransferase EC 2.1.1.28: phenylethanolamine N-methyltransferase EC 2.1.1.29: Now covered by EC 2.1.1.202, EC 2.1.1.203 and EC .1.1.204 EC 2.1.1.30: tRNA (purine-2- or -6-)-methyltransferase: Reactions previously described are due to EC 2.1.1.32 EC 2.1.1.31: Now covered by EC 2.1.1.221 and EC 2.1.1.228 EC 2.1.1.32: Now covered by EC 2.1.1.213, EC 2.1.1.214, EC 2.1.1.215 and EC 2.1.1.216 EC 2.1.1.33: tRNA (guanine46-N7)-methyltransferase EC 2.1.1.34: tRNA (guanosine18-2′-O)-methyltransferase EC 2.1.1.35: tRNA (uracil54-C5)-methyltransferase EC 2.1.1.36: Now covered by EC 2.1.1.217, EC 2.1.1.218, EC 2.1.1.219, EC 2.1.1.220 EC 2.1.1.37: DNA (cytosine-5-)-methyltransferase EC 2.1.1.38: O-demethylpuromycin O-methyltransferase EC 2.1.1.39: inositol 3-methyltransferase EC 2.1.1.40: inositol 1-methyltransferase EC 2.1.1.41: sterol 24-C-methyltransferase EC 2.1.1.42: flavone 3′-O-methyltransferase EC 2.1.1.43: Now described by EC 2.1.1.354, EC 2.1.1.355, EC 2.1.1.356, EC 2.1.1.357, EC 2.1.1.358, EC 2.1.1.359, EC 2.1.1.360, EC 2.1.1.361 and EC 2.1.1.362 EC 2.1.1.44: L-histidine Nα-methyltransferase EC 2.1.1.45: thymidylate synthase EC 2.1.1.46: isoflavone 4′-O-methyltransferase EC 2.1.1.47: indolepyruvate C-methyltransferase EC 2.1.1.48: Now covered by EC 2.1.1.181, EC 2.1.1.182, EC 2.1.1.183 and EC 2.1.1.184 EC 2.1.1.49: amine N-methyltransferase EC 2.1.1.50: loganate O-methyltransferase EC 2.1.1.51: Now covered by EC 2.1.1.187 and EC 2.1.1.188 EC 2.1.1.52: Now covered by EC 2.1.1.171, EC 2.1.1.172, EC 2.1.1.173 and EC 2.1.1.174 EC 2.1.1.53: putrescine N-methyltransferase EC 2.1.1.54: deoxycytidylate C-methyltransferase EC 2.1.1.55: tRNA (adenine-N6-)-methyltransferase EC 2.1.1.56: mRNA (guanine-N7)-methyltransferase EC 2.1.1.57: methyltransferase cap1 EC 2.1.1.58: deleted, included in EC 2.1.1.57 EC 2.1.1.59: [cytochrome c]-lysine N-methyltransferase EC 2.1.1.60: calmodulin-lysine N-methyltransferase EC 2.1.1.61: tRNA (5-methylaminomethyl-2-thiouridylate)-methyltransferase EC 2.1.1.62: mRNA (2′-O-methyladenosine-N6-)-methyltransferase EC 2.1.1.63: methylated-DNA—[protein]-cysteine S-methyltransferase EC 2.1.1.64: 3-demethylubiquinol 3-O-methyltransferase EC 2.1.1.65: licodione 2′-O-methyltransferase EC 2.1.1.66: Now covered by EC 2.1.1.230 EC 2.1.1.67: thiopurine S-methyltransferase EC 2.1.1.68: caffeate O-methyltransferase EC 2.1.1.69: 5-hydroxyfuranocoumarin 5-O-methyltransferase EC 2.1.1.70: 8-hydroxyfuranocoumarin 8-O-methyltransferase EC 2.1.1.71: phosphatidyl-N-methylethanolamine N-methyltransferase EC 2.1.1.72: site-specific DNA-methyltransferase (adenine-specific) EC 2.1.1.73: deleted: reaction is that of EC 2.1.1.37, DNA (cytosine-5-)-methyltransferase EC 2.1.1.74: methylenetetrahydrofolate—tRNA-(uracil54-C5)-methyltransferase [NAD(P)H-oxidizing] EC 2.1.1.75: apigenin 4′-O-methyltransferase EC 2.1.1.76: quercetin 3-O-methyltransferase EC 2.1.1.77: protein-L-isoaspartate(D-aspartate) O-methyltransferase EC 2.1.1.78: isoorientin 3′-O-methyltransferase EC 2.1.1.79: cyclopropane-fatty-acyl-phospholipid synthase EC 2.1.1.80: protein-glutamate O-methyltransferase EC 2.1.1.81: deleted, included in EC 2.1.1.49 EC 2.1.1.82: 3-methylquercetin 7-O-methyltransferase EC 2.1.1.83: 3,7-dimethylquercetin 4′-O-methyltransferase EC 2.1.1.84: methylquercetagetin 6-O-methyltransferase EC 2.1.1.85: protein-histidine N-methyltransferase EC 2.1.1.86: Now covered by EC 7.2.1.4 EC 2.1.1.87: pyridine N-methyltransferase EC 2.1.1.88: 8-hydroxyquercetin 8-O-methyltransferase EC 2.1.1.89: tetrahydrocolumbamine 2-O-methyltransferase EC 2.1.1.90: methanol—5-hydroxybenzimidazolylcobamide Co-methyltransferase EC 2.1.1.91: isobutyraldoxime O-methyltransferase EC 2.1.1.92: Now included with EC 2.1.1.69 EC 2.1.1.93: is identical to EC 2.1.1.70, 8-hydroxyfuranocoumarin 8-O-methyltransferase EC 2.1.1.94: tabersonine 16-O-methyltransferase EC 2.1.1.95: tocopherol C-methyltransferase EC 2.1.1.96: thioether S-methyltransferase EC 2.1.1.97: 3-hydroxyanthranilate 4-C-methyltransferase EC 2.1.1.98: diphthine synthase EC 2.1.1.99: 3-hydroxy-16-methoxy-2,3-dihydrotabersonine N-methyltransferase EC 2.1.1.100: protein-S-isoprenylcysteine O-methyltransferase EC 2.1.1.101: macrocin O-methyltransferase EC 2.1.1.102: demethylmacrocin O-methyltransferase EC 2.1.1.103: phosphoethanolamine N-methyltransferase EC 2.1.1.104: caffeoyl-CoA O-methyltransferase EC 2.1.1.105: N-benzoyl-4-hydroxyanthranilate 4-O-methyltransferase EC 2.1.1.106: tryptophan 2-C-methyltransferase EC 2.1.1.107: uroporphyrinogen-III C-methyltransferase EC 2.1.1.108: 6-hydroxymellein O-methyltransferase EC 2.1.1.109: demethylsterigmatocystin 6-O-methyltransferase EC 2.1.1.110: sterigmatocystin 8-O-methyltransferase EC 2.1.1.111: anthranilate N-methyltransferase EC 2.1.1.112: glucuronoxylan 4-O-methyltransferase EC 2.1.1.113: site-specific DNA-methyltransferase (cytosine-N4-specific) EC 2.1.1.114: polyprenyldihydroxybenzoate methyltransferase EC 2.1.1.115: (RS)-1-benzyl-1,2,3,4-tetrahydroisoquinoline N-methyltransferase EC 2.1.1.116: 3′-hydroxy-N-methyl-(S)-coclaurine 4′-O-methyltransferase EC 2.1.1.117: (S)-scoulerine 9-O-methyltransferase EC 2.1.1.118: columbamine O-methyltransferase EC 2.1.1.119: 10-hydroxydihydrosanguinarine 10-O-methyltransferase EC 2.1.1.120: 12-hydroxydihydrochelirubine 12-O-methyltransferase EC 2.1.1.121: 6-O-methylnorlaudanosoline 5′-O-methyltransferase EC 2.1.1.122: (S)-tetrahydroprotoberberine N-methyltransferase EC 2.1.1.123: [cytochrome-c]-methionine S-methyltransferase EC 2.1.1.124: Now covered by EC 2.1.1.319, EC 2.1.1.320, EC 2.1.1.321 and EC 2.1.1.322 EC 2.1.1.125: Now covered by EC 2.1.1.319, EC 2.1.1.320 and EC 2.1.1.321 EC 2.1.1.126: Now covered by EC 2.1.1.319, EC 2.1.1.320 and EC 2.1.1.321 EC 2.1.1.127: [ribulose-bisphosphate carboxylase]-lysine N-methyltransferase EC 2.1.1.128: (RS)-norcoclaurine 6-O-methyltransferase EC 2.1.1.129: inositol 4-methyltransferase EC 2.1.1.130: precorrin-2 C20-methyltransferase EC 2.1.1.131: precorrin-2 C17-methyltransferase EC 2.1.1.132: precorrin-6B C5,15-methyltransferase (decarboxylating) EC 2.1.1.133: precorrin-4 C11-methyltransferase EC 2.1.1.134: now with EC 2.1.1.129 EC 2.1.1.135: now EC 1.16.1.8 EC 2.1.1.136: chlorophenol O-methyltransferase EC 2.1.1.137: arsenite methyltransferase EC 2.1.1.138: deleted: Reaction due to EC 2.1.1.137 EC 2.1.1.139: 3′-demethylstaurosporine O-methyltransferase EC 2.1.1.140: (S)-coclaurine-N-methyltransferase EC 2.1.1.141: jasmonate O-methyltransferase EC 2.1.1.142: cycloartenol 24-C-methyltransferase EC 2.1.1.143: 24-methylenesterol C-methyltransferase EC 2.1.1.144: trans-aconitate 2-methyltransferase EC 2.1.1.145: trans-aconitate 3-methyltransferase EC 2.1.1.146: (iso)eugenol O-methyltransferase EC 2.1.1.147: corydaline synthase EC 2.1.1.148: thymidylate synthase (FAD) EC 2.1.1.149: Now covered by EC 2.1.1.267, flavonoid 3′,5′-methyltransferase EC 2.1.1.150: isoflavone 7-O-methyltransferase EC 2.1.1.151: cobalt-factor II C20-methyltransferase EC 2.1.1.152: precorrin-6A synthase (deacetylating) EC 2.1.1.153: vitexin 2′′-O-rhamnoside 7-O-methyltransferase EC 2.1.1.154: isoliquiritigenin 2′-O-methyltransferase EC 2.1.1.155: kaempferol 4′-O-methyltransferase EC 2.1.1.156: glycine/sarcosine N-methyltransferase EC 2.1.1.157: sarcosine/dimethylglycine N-methyltransferase EC 2.1.1.158: 7-methylxanthosine synthase EC 2.1.1.159: theobromine synthase EC 2.1.1.160: caffeine synthase EC 2.1.1.161: dimethylglycine N-methyltransferase EC 2.1.1.162: glycine/sarcosine/dimethylglycine N-methyltransferase EC 2.1.1.163: demethylmenaquinone methyltransferase EC 2.1.1.164: demethylrebeccamycin-D-glucose O-methyltransferase EC 2.1.1.165: methyl halide transferase EC 2.1.1.166: 23S rRNA (uridine2552-2′-O)-methyltransferase EC 2.1.1.167: 27S pre-rRNA (guanosine2922-2′-O)-methyltransferase EC 2.1.1.168: 21S rRNA (uridine2791-2′-O)-methyltransferase EC 2.1.1.169: tricetin 3′,4′,5′-O-trimethyltransferase EC 2.1.1.170: 16S rRNA (guanine527-N7)-methyltransferase EC 2.1.1.171: 16S rRNA (guanine966-N2)-methyltransferase EC 2.1.1.172: 16S rRNA (guanine1207-N2))-methyltransferase EC 2.1.1.173: 23S rRNA (guanine2445-N2)-methyltransferase EC 2.1.1.174: 23S rRNA (guanine1835-N2)-methyltransferase EC 2.1.1.175: tricin synthase EC 2.1.1.176: 16S rRNA (cytosine967-C5)-methyltransferase EC 2.1.1.177: 23S rRNA (pseudouridine1915-N3)-methyltransferase EC 2.1.1.178: 16S rRNA (cytosine1407-C5)-methyltransferase EC 2.1.1.179: 16S rRNA (guanine1405-N7)-methyltransferase EC 2.1.1.180: 16S rRNA (adenine1408-N1)-methyltransferase EC 2.1.1.181: 23S rRNA (adenine1618-N6)-methyltransferase EC 2.1.1.182: 16S rRNA (adenine1518-N6/adenineadenine1519-N6)-dimethyltransferase EC 2.1.1.183: 18S rRNA (adenine1779-N6/adenine1780-N6)-dimethyltransferase EC 2.1.1.184: 23S rRNA (adenine2085-N6)-dimethyltransferase EC 2.1.1.185: 23S rRNA (guanosine2251-2′-O)-methyltransferase EC 2.1.1.186: 23S rRNA (cytidine2498-2′-O)-methyltransferase EC 2.1.1.187: 23S rRNA (guanine745-N1)-methyltransferase EC 2.1.1.188: 23S rRNA (guanine748-N1)-methyltransferase EC 2.1.1.189: 23S rRNA (uracil747-C5)-methyltransferase EC 2.1.1.190: 23S rRNA (uracil1939-C5)-methyltransferase EC 2.1.1.191: 23S rRNA (cytosine1962-C5)-methyltransferase EC 2.1.1.192: 23S rRNA (adenine2503-C2)-methyltransferase EC 2.1.1.193: 16S rRNA (uracil1498-N3)-methyltransferase EC 2.1.1.194: A mixture of EC 2.1.1.192 and EC 2.1.1.224 EC 2.1.1.195: cobalt-precorrin-5B (C1)-methyltransferase EC 2.1.1.196: cobalt-precorrin-7 (C15)-methyltransferase (decarboxylating) EC 2.1.1.197: malonyl-[acyl-carrier protein] O-methyltransferase EC 2.1.1.198: 16S rRNA (cytidine1402-2′-O)-methyltransferase EC 2.1.1.199: 16S rRNA (cytosine1402-N4)-methyltransferase EC 2.1.1.200: tRNA (cytidine32/uridine32-2′-O)-methyltransferase EC 2.1.1.201: 2-methoxy-6-polyprenyl-1,4-benzoquinol methylase EC 2.1.1.202: multisite-specific tRNA:(cytosine-C5)-methyltransferase EC 2.1.1.203: tRNA (cytosine34-C5)-methyltransferase EC 2.1.1.204: tRNA (cytosine38-C5)-methyltransferase EC 2.1.1.205: tRNA (cytidine32/guanosine34-2′-O)-methyltransferase EC 2.1.1.206: tRNA (cytidine56-2′-O)-methyltransferase EC 2.1.1.207: tRNA (cytidine34-2′-O)-methyltransferase EC 2.1.1.208: 23S rRNA (uridine2479-2′-O)-methyltransferase EC 2.1.1.209: 23S rRNA (guanine2535-N1)-methyltransferase EC 2.1.1.210: demethylspheroidene O-methyltransferase EC 2.1.1.211: tRNASer(uridine44-2′-O)-methyltransferase EC 2.1.1.212: 2,7,4′-trihydroxyisoflavanone 4′-O-methyltransferase EC 2.1.1.213: tRNA (guanine110-N2)-dimethyltransferase EC 2.1.1.214: tRNA (guanine10-N2)-methyltransferase EC 2.1.1.215: tRNA (guanine26-N2/guanine27-N2)-dimethyltransferase EC 2.1.1.216: tRNA (guanine26-N2)-dimethyltransferase EC 2.1.1.217: tRNA (adenine22-N1)-methyltransferase EC 2.1.1.218: tRNA (adenine9-N1)-methyltransferase EC 2.1.1.219: tRNA (adenine57-N1/adenine58-N1)-methyltransferase EC 2.1.1.220: tRNA (adenine58-N1)-methyltransferase EC 2.1.1.221: tRNA (guanine9-N1)-methyltransferase EC 2.1.1.222: 2-polyprenyl-6-hydroxyphenyl methylase EC 2.1.1.223: tRNA1Val (adenine937-N6)-methyltransferase EC 2.1.1.224: 23S rRNA (adenine2503-C8)-methyltransferase EC 2.1.1.225: tRNA:m4X modification enzyme EC 2.1.1.226: 23S rRNA (cytidine1920-2′-O)-methyltransferase EC 2.1.1.227: 16S rRNA (cytidine1409-2′-O)-methyltransferase EC 2.1.1.228: tRNA (guanine37-N1)-methyltransferase EC 2.1.1.229: tRNA (carboxymethyluridine34-5-O)-methyltransferase EC 2.1.1.230: 23S rRNA (adenosine1067-2′-O)-methyltransferase EC 2.1.1.231: flavonoid 4′-O-methyltransferase EC 2.1.1.232: naringenin 7-O-methyltransferase EC 2.1.1.233: [phosphatase 2A protein]-leucine-carboxy methyltransferase EC 2.1.1.234: dTDP-3-amino-3,4,6-trideoxy-α-D-glucopyranose N,N-dimethyltransferase EC 2.1.1.235: dTDP-3-amino-3,6-dideoxy-α-D-glucopyranose N,N-dimethyltransferase EC 2.1.1.236: dTDP-3-amino-3,6-dideoxy-α-D-galactopyranose N,N-dimethyltransferase EC 2.1.1.237: mycinamicin III 3′′-O-methyltransferase EC 2.1.1.238: mycinamicin VI 2′′-O-methyltransferaseD EC 2.1.1.239: L-olivosyl-oleandolide 3-O-methyltransferase EC 2.1.1.240: trans-resveratrol di-O-methyltransferase EC 2.1.1.241: 2,4,7-trihydroxy-1,4-benzoxazin-3-one-glucoside 7-O-methyltransferase EC 2.1.1.242: 16S rRNA (guanine1516-N2)-methyltransferase EC 2.1.1.243: 2-ketoarginine methyltransferase EC 2.1.1.244: protein N-terminal methyltransferase EC 2.1.1.245: 5-methyltetrahydrosarcinapterin—corrinoid/iron-sulfur protein Co-methyltransferase EC 2.1.1.246: [methyl-Co(III) methanol-specific corrinoid protein]—coenzyme M methyltransferase EC 2.1.1.247: (methyl-Co(III) methylamine-specific corrinoid protein)—coenzyme M methyltransferase EC 2.1.1.248: methylamine—corrinoid protein Co-methyltransferase EC 2.1.1.249: dimethylamine—corrinoid protein Co-methyltransferase EC 2.1.1.250: trimethylamine—corrinoid protein Co-methyltransferase EC 2.1.1.251: methylated-thiol—coenzyme M methyltransferase EC 2.1.1.252: tetramethylammonium—corrinoid protein Co-methyltransferase EC 2.1.1.253: [methyl-Co(III) tetramethylammonium-specific corrinoid protein]—coenzyme M methyltransferase EC 2.1.1.254: erythromycin 3′′-O-methyltransferase EC 2.1.1.255: geranyl diphosphate 2-C-methyltransferase EC 2.1.1.256: tRNA (guanine6-N6-methyltransferase) EC 2.1.1.257: tRNA (pseudouridine54-N1)-methyltransferase EC 2.1.1.258: 5-methyltetrahydrofolate—corrinoid/iron-sulfur protein Co-methyltransferase EC 2.1.1.259: [fructose-bisphosphate aldolase]-lysine N-methyltransferase EC 2.1.1.260: rRNA small subunit pseudouridine methyltransferase Nep1 EC 2.1.1.261: 4-dimethylallyltryptophan N-methyltransferase EC 2.1.1.262: squalene methyltransferase EC 2.1.1.263: botryococcene C-methyltransferase EC 2.1.1.264: 23S rRNA (guanine2069-N7)-methyltransferase EC 2.1.1.265: tellurite methyltransferase EC 2.1.1.266: 23S rRNA (adenine2030-N6)-methyltransferase EC 2.1.1.267: flavonoid 3′,5′-methyltransferase EC 2.1.1.268: tRNAThr (cytosine32-N3)-methyltransferase EC 2.1.1.269: dimethylsulfoniopropionate demethylase EC 2.1.1.270: (+)-6a-hydroxymaackiain 3-O-methyltransferase EC 2.1.1.271: cobalt-precorrin-4 methyltransferase EC 2.1.1.272: cobalt-factor III methyltransferase EC 2.1.1.273: benzoate O-methyltransferase EC 2.1.1.274: salicylate 1-O-methyltransferase EC 2.1.1.275: gibberellin A9 O-methyltransferase EC 2.1.1.276: gibberellin A4 carboxyl methyltransferase EC 2.1.1.277: anthranilate O-methyltransferase EC 2.1.1.278: indole-3-acetate O-methyltransferase EC 2.1.1.279: trans-anol O-methyltransferase EC 2.1.1.280: selenocysteine Se-methyltransferase EC 2.1.1.281: phenylpyruvate C3-methyltransferase EC 2.1.1.282: tRNAPhe 7-[(3-amino-3-carboxypropyl)-4-demethylwyosine37-N4]-methyltransferase EC 2.1.1.283: emodin O-methyltransferase EC 2.1.1.284: 8-demethylnovobiocic acid C8-methyltransferase EC 2.1.1.285: demethyldecarbamoylnovobiocin O-methyltransferase EC 2.1.1.286: 25S rRNA (adenine2142-N1)-methyltransferase EC 2.1.1.287: 25S rRNA (adenine645-N1)-methyltransferase EC 2.1.1.288: aklanonic acid methyltransferase EC 2.1.1.289: cobalt-precorrin-7 (C5)-methyltransferase EC 2.1.1.290: tRNAPhe [7-(3-amino-3-carboxypropyl)wyosine37-O]-methyltransferase EC 2.1.1.291: (R,S)-reticuline 7-O-methyltransferase EC 2.1.1.292: carminomycin 4-O-methyltransferase EC 2.1.1.293: 6-hydroxytryprostatin B O-methyltransferase EC 2.1.1.294: 3-O-phospho-polymannosyl GlcNAc-diphospho-ditrans,octacis-undecaprenol 3-phospho-methyltransferase EC 2.1.1.295: 2-methyl-6-phytyl-1,4-hydroquinone methyltransferase EC 2.1.1.296: methyltransferase cap2 EC 2.1.1.297: peptide chain release factor N5-glutamine methyltransferase EC 2.1.1.298: ribosomal protein L3 N5-glutamine methyltransferase EC 2.1.1.299: protein N-terminal monomethyltransferase EC 2.1.1.300: pavine N-methyltransferase EC 2.1.1.301: cypemycin N-terminal methyltransferase EC 2.1.1.302: 3-hydroxy-5-methyl-1-naphthoate 3-O-methyltransferase EC 2.1.1.303: 2,7-dihydroxy-5-methyl-1-naphthoate 7-O-methyltransferase EC 2.1.1.304: L-tyrosine C3-methyltransferase EC 2.1.1.305: 8-demethyl-8-α-L-rhamnosyltetracenomycin-C 2′-O-methyltransferase EC 2.1.1.306: 8-demethyl-8-(2-methoxy-α-L-rhamnosyl)tetracenomycin-C 3′-O-methyltransferase EC 2.1.1.307: 8-demethyl-8-(2,3-dimethoxy-α-L-rhamnosyl)tetracenomycin-C 4′-O-methyltransferase EC 2.1.1.308: cytidylyl-2-hydroxyethylphosphonate methyltransferase EC 2.1.1.309: 18S rRNA (guanine1575-N7)-methyltransferase EC 2.1.1.310: 25S rRNA (cytosine2870-C5)-methyltransferase EC 2.1.1.311: 25S rRNA (cytosine2278-C5)-methyltransferase EC 2.1.1.312: 25S rRNA (uracil2843-N3)-methyltransferase EC 2.1.1.313: 25S rRNA (uracil2634-N3)-methyltransferase EC 2.1.1.314: diphthine methyl ester synthase EC 2.1.1.315: 27-O-demethylrifamycin SV methyltransferase EC 2.1.1.316: mitomycin 6-O-methyltransferase EC 2.1.1.317: sphingolipid C9-methyltransferase EC 2.1.1.318: [trehalose-6-phosphate synthase]-L-cysteine S-methyltransferase EC 2.1.1.319: type I protein arginine methyltransferase EC 2.1.1.320: type II protein arginine methyltransferase EC 2.1.1.321: type III protein arginine methyltransferase EC 2.1.1.322: type IV protein arginine methyltransferase EC 2.1.1.323: (–)-pluviatolide 4-O-methyltransferase EC 2.1.1.324: dTDP-4-amino-2,3,4,6-tetradeoxy-D-glucose N,N-dimethyltransferase EC 2.1.1.325: juvenile hormone-III synthase EC 2.1.1.326: N-acetyldemethylphosphinothricin P-methyltransferase EC 2.1.1.327: phenazine-1-carboxylate N-methyltransferase EC 2.1.1.328: N-demethylindolmycin N-methyltransferase EC 2.1.1.329: demethylphylloquinol methyltransferase EC 2.1.1.330: 5′-demethylyatein 5′-O-methyltransferase EC 2.1.1.331: bacteriochlorophyllide d C-121-methyltransferase EC 2.1.1.332: bacteriochlorophyllide d C-82-methyltransferase EC 2.1.1.333: bacteriochlorophyllide d C-20 methyltransferase EC 2.1.1.334: methanethiol S-methyltransferase EC 2.1.1.335: 4-amino-anhydrotetracycline N4-methyltransferase EC 2.1.1.336: norbelladine O-methyltransferase EC 2.1.1.337: reticuline N-methyltransferase EC 2.1.1.338: desmethylxanthohumol 6′-O-methyltransferase EC 2.1.1.339: xanthohumol 4-O-methyltransferase EC 2.1.1.340: 3-aminomethylindole N'-methyltransferase EC 2.1.1.341: vanillate/3-O-methylgallate O-demethylase EC 2.1.1.342: anaerobilin synthase EC 2.1.1.343: 8-amino-8-demethylriboflavin N,N-dimethyltransferase EC 2.1.1.344: ornithine lipid N-methyltransferase EC 2.1.1.345: psilocybin synthase EC 2.1.1.346: U6 snRNA m6A methyltransferase EC 2.1.1.347: (+)-O-methylkolavelool synthase EC 2.1.1.348: mRNA m6A methyltransferase EC 2.1.1.349: toxoflavin synthase EC 2.1.1.350: menaquinone C8-methyltransferase EC 2.1.1.351: nocamycin O-methyltransferase EC 2.1.1.352: 3-O-acetyl-4′-O-demethylpapaveroxine 4′-O-methyltransferase EC 2.1.1.353: demethylluteothin O-methyltransferase EC 2.1.1.354: [histone H3]-lysine4 N-trimethyltransferase EC 2.1.1.355: [histone H3]-lysine9 N-trimethyltransferase EC 2.1.1.356: [histone H3]-lysine27 N-trimethyltransferase EC 2.1.1.357: [histone H3]-lysine36 N-dimethyltransferase EC 2.1.1.358: [histone H3]-dimethyl-L-lysine36 N-methyltransferase. Now known to have the activity of EC 2.1.1.359, [histone H3]-lysine36 N-trimethyltransferase. EC 2.1.1.359: [histone H3]-lysine36 N-trimethyltransferase EC 2.1.1.360: [histone H3]-lysine79 N-trimethyltransferase EC 2.1.1.361: [histone H4]-lysine20 N-methyltransferase EC 2.1.1.362: [histone H4]-N-methyl-L-lysine20 N-methyltransferase EC 2.1.1.363: pre-sodorifen synthase EC 2.1.1.364: [histone H3]-lysine4 N-methyltransferase EC 2.1.1.365: MMP 1-O-methyltransferase EC 2.1.1.366: [histone H3]-N6,N6-dimethyl-lysine9 N-methyltransferase EC 2.1.1.367: [histone H3]-lysine9 N-methyltransferase EC 2.1.1.368: [histone H3]-lysine9 N-dimethyltransferase EC 2.1.1.369: [histone H3]-lysine27 N-methyltransferase EC 2.1.1.370: [histone H3]-lysine4 N-dimethyltransferase EC 2.1.1.371: [histone H3]-lysine27 N-dimethyltransferase EC 2.1.1.372: [histone H4]-lysine20 N-trimethyltransferase EC 2.1.1.373: 2-hydroxy-4-(methylsulfanyl)butanoate S-methyltransferase EC 2.1.1.374: 2-heptyl-1-hydroxyquinolin-4(1H)-one methyltransferase EC 2.1.1.375: NNS virus cap methyltransferase EC 2.1.1.376: glycine betaine—corrinoid protein Co-methyltransferase EC 2.1.1.377: [methyl-Co(III) glycine betaine-specific corrinoid protein]—coenzyme M methyltransferase EC 2.1.1.378: [methyl-Co(III) glycine betaine-specific corrinoid protein]—tetrahydrofolate methyltransferase EC 2.1.1.379: [methyl coenzyme M reductase]-L-arginine C-5-methyltransferase
Sources: en.wikipedia.org
反相高效液相色谱用于分离和纯度评估，质谱用于分子量确认。肽图谱或串联质谱可进一步验证序列。具体方法需根据样品基质和监管要求选择。
高温、强光、潮湿和反复冻融都会加速肽降解。冻干粉通常建议低温避光保存。复溶后的溶液稳定性较短，应依据验证数据确定保存条件。
氧化、脱酰胺和截短肽可能影响色谱纯度和生物活性读数。不同批次之间这些杂质的相对比例可能不同。是否具有临床意义取决于杂质水平、给药途径和暴露量，尚无统一阈值。
The amino acid sequence matches human growth hormone-releasing hormone, but the amino terminus carries a trans-3-hexenoyl group instead of a free amine. That single structural change chiefly affects enzymatic stability rather than receptor selectivity.