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MIF-I 是催产素的 C 端三肽,已被证明在许多行为测试和临床情况中具有活性。
编号:173636
CAS号:2002-44-0/1207536-22-8
单字母:H2N-PLG-CONH2
编号: | 173636 |
中文名称: | 促黑素释放抑制因子 Melanocyte stimulating hormone release inhibiting factor、MIF-I、Oxytocin C-terminal tripeptide |
英文名: | Melanocyte stimulating hormone release inhibiting factor、MIF-I、Oxytocin C-terminal tripeptide |
CAS号: | 2002-44-0,freebase 1207536-22-8,TFA盐 |
单字母: | H2N-PLG-CONH2 |
三字母: | H2N N端氨基:N-terminal amino group。在肽或多肽链中含有游离a-氨基的氨基酸一端。在表示氨基酸序列时,通常将N端放在肽链的左边。 -ProL-脯氨酸:proline。系统命名为吡咯烷-(2S)-羧酸。为亚氨基酸。是编码氨基酸。在肽链中有特殊作用,如易形成顺式的肽键等。符号:P,Pro。 -LeuL-亮氨酸:leucine。系统命名为(2S)-氨基-4-甲基戊酸。是编码氨基酸。是哺乳动物的必需氨基酸。符号:L,Leu。 -Gly甘氨酸:glycine。系统命名为 2-氨基乙酸。是编码氨基酸中没有旋光性的最简单的氨基酸,因具有甜味而得名。符号:G,Gly。 -CONH2C端酰胺化 |
氨基酸个数: | 3 |
分子式: | C13H24N4O3 |
平均分子量: | 284.35 |
精确分子量: | 284.18 |
等电点(PI): | - |
pH=7.0时的净电荷数: | 0.97 |
平均亲水性: | -1.8 |
疏水性值: | 0.6 |
消光系数: | - |
来源: | 人工化学合成,仅限科学研究使用,不得用于人体。 |
盐体系: | 可选TFA、HAc、HCl或其它 |
储存条件: | 负80℃至负20℃ |
标签: | 三肽 |
MIF-I 是催产素的 C 端三肽,已被证明在许多行为测试和临床情况中具有活性。
MIF-I, the C-terminal tripeptide of oxytocin, has been shown to be active in numerous behavioral tests and clinical situations.
催产素C末端三肽乙酸酯是黑素细胞刺激激素(MSH)释放的抑制剂,可阻断α-MSH的释放,增加大脑多巴胺水平,并在体内拮抗生理和行为阿片类药物的作用。
Oxytocin C-terminal tripeptide acetate, an inhibitor of melanocyte-stimulating hormone (MSH) release, blocks the release of α-MSH, increases brain dopamine levels, and antagonizes physiological and behavioral opioid effects in vivo.
背景
促黑素释放抑制因子的化学式为C13H24N4O3,是一个三肽,氨基酸序列为H2N-Pro-Leu-Gly-amide,分子量为284.35。促黑素释放抑制因子也被称为Pro-Leu-Gly-NH2、Melanostatin、MSH释放抑制激素或MIF-1,是来源于催产素裂解的内源性多肽片段,在体内通常发挥多种不同的活性(1)。MIF-1产生多种效果,例如阻断阿片受体激活的效应(2)、充当D2和D4多巴胺受体亚型的正向变构调节剂、抑制其他神经肽如α-MSH的释放和增强褪黑素活性(3)。MIF-1对血液代谢具有抗性,可以轻易穿过血脑屏障,它的口服活性较差,通常采用注射的方式用药。
参考文献:
1. Celis ME, Taleisnik S, Walter R (July 1971). "Regulation of formation and proposed structure of the factor inhibiting the release of melanocyte-stimulating hormone". Proceedings of the National Academy of Sciences of the United States of America 68 (7): 1428–33.
2. Contreras PC, Takemori AE (June 1984). "Effect of prolyl-leucyl-glycinamide and alpha-melanocyte-stimulating hormone on levorphanol-induced analgesia, tolerance and dependence". Life Sciences 34 (26): 2559–66.
3. Sandyk R (May 1990). "MIF-induced augmentation of melatonin functions: possible relevance to mechanisms of action of MIF-1 inmovement disorders". The International Journal of Neuroscience 52 (1-2): 59–65.
MSH-Release Inhibiting Factor (MRIF) has been shown to be a potent inhibitor of the release of proinflammatory cytokines. It is derived from the acid methyl ester of mouse serum, and has been shown to inhibit the release of tumor necrosis factor-α (TNF-α) in animal studies. MRIF has also been shown to have anti-diabetic effects in mice. MRIF inhibits the production of inflammatory cytokines by blocking TNF-α at a molecular level. This protein binds to progesterone receptor and prevents it from interacting with its ligand, which is necessary for cancer cell growth. The expression system for this protein is E. coli, and it can be used as an immunosuppressant in animal studies.\nMRIF also blocks TNF-α activity by inhibiting transcriptional activation of NFκB and AP-1, which are proteins that regulate gene expression.
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10.1007/BF00508614 | On the optimal dosage of Pro-Leu-Gly-NH2 (MIF) in neuropharmacological tests and clinical use | 下载 |
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多肽H2N-Pro-Leu-Gly-NH2的合成步骤:
1、合成MBHA树脂:取若干克的MBHA树脂(如初始取代度为0.5mmol/g)和1倍树脂摩尔量的Fmoc-Linker-OH加入到反应器中,加入DMF,搅拌使氨基酸完全溶解。再加入树脂2倍量的DIEPA,搅拌混合均匀。再加入树脂0.95倍量的HBTU,搅拌混合均匀。反应3-4小时后,用DMF洗涤3次。用2倍树脂体积的10%乙酸酐/DMF 进行封端30分钟。然后再用DMF洗涤3次,甲醇洗涤2次,DCM洗涤2次,再用甲醇洗涤2次。真空干燥12小时以上,得到干燥的树脂{Fmoc-Linker-MHBA Resin},测定取代度。这里测得取代度为 0.3mmol/g。结构如下图:
2、脱Fmoc:取1.33g的上述树脂,用DCM或DMF溶胀20分钟。用DMF洗涤2遍。加3倍树脂体积的20%Pip/DMF溶液,鼓氮气30分钟,然后2倍树脂体积的DMF 洗涤5次。得到 H2N-Linker-MBHA Resin 。(此步骤脱除Fmoc基团,茚三酮检测为蓝色,Pip为哌啶)。结构图如下:
3、缩合:取1.2mmol Fmoc-Gly-OH 氨基酸,加入到上述树脂里,加适当DMF溶解氨基酸,再依次加入2.39mmol DIPEA,1.14mmol HBTU。反应30分钟后,取小样洗涤,茚三酮检测为无色。用2倍树脂体积的DMF 洗涤3次树脂。(洗涤树脂,去掉残留溶剂,为下一步反应做准备)。得到Fmoc-Gly-Linker-MBHA Resin。氨基酸:DIPEA:HBTU:树脂=3:6:2.85:1(摩尔比)。结构图如下:
4、依次循环步骤二、步骤三,依次得到
H2N-Gly-Linker-MBHA Resin
Fmoc-Leu-Gly-Linker-MBHA Resin
H2N-Leu-Gly-Linker-MBHA Resin
Fmoc-Pro-Leu-Gly-Linker-MBHA Resin
以上中间结构,均可在专肽生物多肽计算器-多肽结构计算器中,一键画出。
最后再经过步骤二得到 H2N-Pro-Leu-Gly-Linker-MBHA Resin,结构如下:
5、切割:6倍树脂体积的切割液(或每1g树脂加8ml左右的切割液),摇床摇晃 2小时,过滤掉树脂,用冰无水乙醚沉淀滤液,并用冰无水乙醚洗涤沉淀物3次,最后将沉淀物放真空干燥釜中,常温干燥24小试,得到粗品H2N-Pro-Leu-Gly-NH2。结构图见产品结构图。
切割液选择:1)TFA:H2O=95%:5%
2)TFA:H2O:TIS=95%:2.5%:2.5%
3)三氟乙酸:茴香硫醚:1,2-乙二硫醇:苯酚:水=87.5%:5%:2.5%:2.5%:2.5%
(前两种适合没有容易氧化的氨基酸,例如Trp、Cys、Met。第三种适合几乎所有的序列。)
6、纯化冻干:使用液相色谱纯化,收集目标峰液体,进行冻干,获得蓬松的粉末状固体多肽。不过这时要取小样复测下纯度 是否目标纯度。
7、最后总结:
杭州专肽生物技术有限公司(ALLPEPTIDE https://www.allpeptide.com)主营定制多肽合成业务,提供各类长肽,短肽,环肽,提供各类修饰肽,如:荧光标记修饰(CY3、CY5、CY5.5、CY7、FAM、FITC、Rhodamine B、TAMRA等),功能基团修饰肽(叠氮、炔基、DBCO、DOTA、NOTA等),同位素标记肽(N15、C13),订书肽(Stapled Peptide),脂肪酸修饰肽(Pal、Myr、Ste),磷酸化修饰肽(P-Ser、P-Thr、P-Tyr),环肽(酰胺键环肽、一对或者多对二硫键环),生物素标记肽,PEG修饰肽,甲基化修饰肽
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