Proinsulin C-peptide (human) 是一种由 31 个氨基酸残基构成的多肽，连接胰岛素原 A 链和 B 链以确保其正确折叠，具有生物活性和调节细胞的功能。
编号：110012
CAS号：33017-11-7
单字母：H2N-EAEDLQVGQVELGGGPGAGSLQPLALEGSLQ-OH
Proinsulin C-peptide (human) 是一种由 31 个氨基酸残基构成的多肽，连接胰岛素原 A 链和 B 链以确保其正确折叠，具有生物活性和调节细胞的功能。
Proinsulin C-peptide (human) is a 31-amino-acid peptide that links the A and B chains of proinsulin, ensuring its correct folding, which is biologically active and modulates cellular function [1].
| DOI | 名称 | |
|---|---|---|
| 10.1007/s00125-010-1736-6 | Cellular mechanisms by which proinsulin C-peptide prevents insulin-induced neointima formation in human saphenous vein | 下载 |
多肽H2N-Glu-Ala-Glu-Asp-Leu-Gln-Val-Gly-Gln-Val-Glu-Leu-Gly-Gly-Gly-Pro-Gly-Ala-Gly-Ser-Leu-Gln-Pro-Leu-Ala-Leu-Glu-Gly-Ser-Leu-Gln-COOH的合成步骤：
1、合成CTC树脂：称取1.32g CTC Resin（如初始取代度约为1.12mmol/g）和1.77mmol Fmoc-Gln(Trt)-OH于反应器中，加入适量DCM溶解氨基酸（需要注意，此时CTC树脂体积会增大好几倍，避免DCM溶液过少），再加入4.44mmol DIPEA（Mw：129.1,d：0.740g/ml），反应2-3小时后，可不抽滤溶液，直接加入1ml的HPLC级甲醇，封端半小时。依次用DMF洗涤2次，甲醇洗涤1次，DCM洗涤一次，甲醇洗涤一次，DCM洗涤一次，DMF洗涤2次（这里使用甲醇和DCM交替洗涤，是为了更好地去除其他溶质，有利于后续反应）。得到 Fmoc-Gln(Trt)-CTC Resin。结构图如下：
2、脱Fmoc：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-Gln(Trt)-CTC 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4.44mmol Fmoc-Leu-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8.87mmol DIPEA，4.21mmol 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-Leu-Gln(Trt)-CTC 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-Leu-Gln(Trt)-CTC Resin
Fmoc-Ser(tBu)-Leu-Gln(Trt)-CTC Resin
H2N-Ser(tBu)-Leu-Gln(Trt)-CTC Resin
Fmoc-Gly-Ser(tBu)-Leu-Gln(Trt)-CTC Resin
H2N-Gly-Ser(tBu)-Leu-Gln(Trt)-CTC Resin
Fmoc-Glu(OtBu)-Gly-Ser(tBu)-Leu-Gln(Trt)-CTC Resin
H2N-Glu(OtBu)-Gly-Ser(tBu)-Leu-Gln(Trt)-CTC Resin
Fmoc-Leu-Glu(OtBu)-Gly-Ser(tBu)-Leu-Gln(Trt)-CTC Resin
H2N-Leu-Glu(OtBu)-Gly-Ser(tBu)-Leu-Gln(Trt)-CTC Resin
Fmoc-Ala-Leu-Glu(OtBu)-Gly-Ser(tBu)-Leu-Gln(Trt)-CTC Resin
H2N-Ala-Leu-Glu(OtBu)-Gly-Ser(tBu)-Leu-Gln(Trt)-CTC Resin
Fmoc-Leu-Ala-Leu-Glu(OtBu)-Gly-Ser(tBu)-Leu-Gln(Trt)-CTC Resin
H2N-Leu-Ala-Leu-Glu(OtBu)-Gly-Ser(tBu)-Leu-Gln(Trt)-CTC Resin
Fmoc-Pro-Leu-Ala-Leu-Glu(OtBu)-Gly-Ser(tBu)-Leu-Gln(Trt)-CTC Resin
H2N-Pro-Leu-Ala-Leu-Glu(OtBu)-Gly-Ser(tBu)-Leu-Gln(Trt)-CTC Resin
Fmoc-Gln(Trt)-Pro-Leu-Ala-Leu-Glu(OtBu)-Gly-Ser(tBu)-Leu-Gln(Trt)-CTC Resin
H2N-Gln(Trt)-Pro-Leu-Ala-Leu-Glu(OtBu)-Gly-Ser(tBu)-Leu-Gln(Trt)-CTC Resin
Fmoc-Leu-Gln(Trt)-Pro-Leu-Ala-Leu-Glu(OtBu)-Gly-Ser(tBu)-Leu-Gln(Trt)-CTC Resin
H2N-Leu-Gln(Trt)-Pro-Leu-Ala-Leu-Glu(OtBu)-Gly-Ser(tBu)-Leu-Gln(Trt)-CTC Resin
Fmoc-Ser(tBu)-Leu-Gln(Trt)-Pro-Leu-Ala-Leu-Glu(OtBu)-Gly-Ser(tBu)-Leu-Gln(Trt)-CTC Resin
H2N-Ser(tBu)-Leu-Gln(Trt)-Pro-Leu-Ala-Leu-Glu(OtBu)-Gly-Ser(tBu)-Leu-Gln(Trt)-CTC Resin
Fmoc-Gly-Ser(tBu)-Leu-Gln(Trt)-Pro-Leu-Ala-Leu-Glu(OtBu)-Gly-Ser(tBu)-Leu-Gln(Trt)-CTC Resin
H2N-Gly-Ser(tBu)-Leu-Gln(Trt)-Pro-Leu-Ala-Leu-Glu(OtBu)-Gly-Ser(tBu)-Leu-Gln(Trt)-CTC Resin
Fmoc-Ala-Gly-Ser(tBu)-Leu-Gln(Trt)-Pro-Leu-Ala-Leu-Glu(OtBu)-Gly-Ser(tBu)-Leu-Gln(Trt)-CTC Resin
H2N-Ala-Gly-Ser(tBu)-Leu-Gln(Trt)-Pro-Leu-Ala-Leu-Glu(OtBu)-Gly-Ser(tBu)-Leu-Gln(Trt)-CTC Resin
Fmoc-Gly-Ala-Gly-Ser(tBu)-Leu-Gln(Trt)-Pro-Leu-Ala-Leu-Glu(OtBu)-Gly-Ser(tBu)-Leu-Gln(Trt)-CTC Resin
H2N-Gly-Ala-Gly-Ser(tBu)-Leu-Gln(Trt)-Pro-Leu-Ala-Leu-Glu(OtBu)-Gly-Ser(tBu)-Leu-Gln(Trt)-CTC Resin
Fmoc-Pro-Gly-Ala-Gly-Ser(tBu)-Leu-Gln(Trt)-Pro-Leu-Ala-Leu-Glu(OtBu)-Gly-Ser(tBu)-Leu-Gln(Trt)-CTC Resin
H2N-Pro-Gly-Ala-Gly-Ser(tBu)-Leu-Gln(Trt)-Pro-Leu-Ala-Leu-Glu(OtBu)-Gly-Ser(tBu)-Leu-Gln(Trt)-CTC Resin
Fmoc-Gly-Pro-Gly-Ala-Gly-Ser(tBu)-Leu-Gln(Trt)-Pro-Leu-Ala-Leu-Glu(OtBu)-Gly-Ser(tBu)-Leu-Gln(Trt)-CTC Resin
H2N-Gly-Pro-Gly-Ala-Gly-Ser(tBu)-Leu-Gln(Trt)-Pro-Leu-Ala-Leu-Glu(OtBu)-Gly-Ser(tBu)-Leu-Gln(Trt)-CTC Resin
Fmoc-Gly-Gly-Pro-Gly-Ala-Gly-Ser(tBu)-Leu-Gln(Trt)-Pro-Leu-Ala-Leu-Glu(OtBu)-Gly-Ser(tBu)-Leu-Gln(Trt)-CTC Resin
H2N-Gly-Gly-Pro-Gly-Ala-Gly-Ser(tBu)-Leu-Gln(Trt)-Pro-Leu-Ala-Leu-Glu(OtBu)-Gly-Ser(tBu)-Leu-Gln(Trt)-CTC Resin
Fmoc-Gly-Gly-Gly-Pro-Gly-Ala-Gly-Ser(tBu)-Leu-Gln(Trt)-Pro-Leu-Ala-Leu-Glu(OtBu)-Gly-Ser(tBu)-Leu-Gln(Trt)-CTC Resin
H2N-Gly-Gly-Gly-Pro-Gly-Ala-Gly-Ser(tBu)-Leu-Gln(Trt)-Pro-Leu-Ala-Leu-Glu(OtBu)-Gly-Ser(tBu)-Leu-Gln(Trt)-CTC Resin
Fmoc-Leu-Gly-Gly-Gly-Pro-Gly-Ala-Gly-Ser(tBu)-Leu-Gln(Trt)-Pro-Leu-Ala-Leu-Glu(OtBu)-Gly-Ser(tBu)-Leu-Gln(Trt)-CTC Resin
H2N-Leu-Gly-Gly-Gly-Pro-Gly-Ala-Gly-Ser(tBu)-Leu-Gln(Trt)-Pro-Leu-Ala-Leu-Glu(OtBu)-Gly-Ser(tBu)-Leu-Gln(Trt)-CTC Resin
Fmoc-Glu(OtBu)-Leu-Gly-Gly-Gly-Pro-Gly-Ala-Gly-Ser(tBu)-Leu-Gln(Trt)-Pro-Leu-Ala-Leu-Glu(OtBu)-Gly-Ser(tBu)-Leu-Gln(Trt)-CTC Resin
H2N-Glu(OtBu)-Leu-Gly-Gly-Gly-Pro-Gly-Ala-Gly-Ser(tBu)-Leu-Gln(Trt)-Pro-Leu-Ala-Leu-Glu(OtBu)-Gly-Ser(tBu)-Leu-Gln(Trt)-CTC Resin
Fmoc-Val-Glu(OtBu)-Leu-Gly-Gly-Gly-Pro-Gly-Ala-Gly-Ser(tBu)-Leu-Gln(Trt)-Pro-Leu-Ala-Leu-Glu(OtBu)-Gly-Ser(tBu)-Leu-Gln(Trt)-CTC Resin
H2N-Val-Glu(OtBu)-Leu-Gly-Gly-Gly-Pro-Gly-Ala-Gly-Ser(tBu)-Leu-Gln(Trt)-Pro-Leu-Ala-Leu-Glu(OtBu)-Gly-Ser(tBu)-Leu-Gln(Trt)-CTC Resin
Fmoc-Gln(Trt)-Val-Glu(OtBu)-Leu-Gly-Gly-Gly-Pro-Gly-Ala-Gly-Ser(tBu)-Leu-Gln(Trt)-Pro-Leu-Ala-Leu-Glu(OtBu)-Gly-Ser(tBu)-Leu-Gln(Trt)-CTC Resin
H2N-Gln(Trt)-Val-Glu(OtBu)-Leu-Gly-Gly-Gly-Pro-Gly-Ala-Gly-Ser(tBu)-Leu-Gln(Trt)-Pro-Leu-Ala-Leu-Glu(OtBu)-Gly-Ser(tBu)-Leu-Gln(Trt)-CTC Resin
Fmoc-Gly-Gln(Trt)-Val-Glu(OtBu)-Leu-Gly-Gly-Gly-Pro-Gly-Ala-Gly-Ser(tBu)-Leu-Gln(Trt)-Pro-Leu-Ala-Leu-Glu(OtBu)-Gly-Ser(tBu)-Leu-Gln(Trt)-CTC Resin
H2N-Gly-Gln(Trt)-Val-Glu(OtBu)-Leu-Gly-Gly-Gly-Pro-Gly-Ala-Gly-Ser(tBu)-Leu-Gln(Trt)-Pro-Leu-Ala-Leu-Glu(OtBu)-Gly-Ser(tBu)-Leu-Gln(Trt)-CTC Resin
Fmoc-Val-Gly-Gln(Trt)-Val-Glu(OtBu)-Leu-Gly-Gly-Gly-Pro-Gly-Ala-Gly-Ser(tBu)-Leu-Gln(Trt)-Pro-Leu-Ala-Leu-Glu(OtBu)-Gly-Ser(tBu)-Leu-Gln(Trt)-CTC Resin
H2N-Val-Gly-Gln(Trt)-Val-Glu(OtBu)-Leu-Gly-Gly-Gly-Pro-Gly-Ala-Gly-Ser(tBu)-Leu-Gln(Trt)-Pro-Leu-Ala-Leu-Glu(OtBu)-Gly-Ser(tBu)-Leu-Gln(Trt)-CTC Resin
Fmoc-Gln(Trt)-Val-Gly-Gln(Trt)-Val-Glu(OtBu)-Leu-Gly-Gly-Gly-Pro-Gly-Ala-Gly-Ser(tBu)-Leu-Gln(Trt)-Pro-Leu-Ala-Leu-Glu(OtBu)-Gly-Ser(tBu)-Leu-Gln(Trt)-CTC Resin
H2N-Gln(Trt)-Val-Gly-Gln(Trt)-Val-Glu(OtBu)-Leu-Gly-Gly-Gly-Pro-Gly-Ala-Gly-Ser(tBu)-Leu-Gln(Trt)-Pro-Leu-Ala-Leu-Glu(OtBu)-Gly-Ser(tBu)-Leu-Gln(Trt)-CTC Resin
Fmoc-Leu-Gln(Trt)-Val-Gly-Gln(Trt)-Val-Glu(OtBu)-Leu-Gly-Gly-Gly-Pro-Gly-Ala-Gly-Ser(tBu)-Leu-Gln(Trt)-Pro-Leu-Ala-Leu-Glu(OtBu)-Gly-Ser(tBu)-Leu-Gln(Trt)-CTC Resin
H2N-Leu-Gln(Trt)-Val-Gly-Gln(Trt)-Val-Glu(OtBu)-Leu-Gly-Gly-Gly-Pro-Gly-Ala-Gly-Ser(tBu)-Leu-Gln(Trt)-Pro-Leu-Ala-Leu-Glu(OtBu)-Gly-Ser(tBu)-Leu-Gln(Trt)-CTC Resin
Fmoc-Asp(OtBu)-Leu-Gln(Trt)-Val-Gly-Gln(Trt)-Val-Glu(OtBu)-Leu-Gly-Gly-Gly-Pro-Gly-Ala-Gly-Ser(tBu)-Leu-Gln(Trt)-Pro-Leu-Ala-Leu-Glu(OtBu)-Gly-Ser(tBu)-Leu-Gln(Trt)-CTC Resin
H2N-Asp(OtBu)-Leu-Gln(Trt)-Val-Gly-Gln(Trt)-Val-Glu(OtBu)-Leu-Gly-Gly-Gly-Pro-Gly-Ala-Gly-Ser(tBu)-Leu-Gln(Trt)-Pro-Leu-Ala-Leu-Glu(OtBu)-Gly-Ser(tBu)-Leu-Gln(Trt)-CTC Resin
Fmoc-Glu(OtBu)-Asp(OtBu)-Leu-Gln(Trt)-Val-Gly-Gln(Trt)-Val-Glu(OtBu)-Leu-Gly-Gly-Gly-Pro-Gly-Ala-Gly-Ser(tBu)-Leu-Gln(Trt)-Pro-Leu-Ala-Leu-Glu(OtBu)-Gly-Ser(tBu)-Leu-Gln(Trt)-CTC Resin
H2N-Glu(OtBu)-Asp(OtBu)-Leu-Gln(Trt)-Val-Gly-Gln(Trt)-Val-Glu(OtBu)-Leu-Gly-Gly-Gly-Pro-Gly-Ala-Gly-Ser(tBu)-Leu-Gln(Trt)-Pro-Leu-Ala-Leu-Glu(OtBu)-Gly-Ser(tBu)-Leu-Gln(Trt)-CTC Resin
Fmoc-Ala-Glu(OtBu)-Asp(OtBu)-Leu-Gln(Trt)-Val-Gly-Gln(Trt)-Val-Glu(OtBu)-Leu-Gly-Gly-Gly-Pro-Gly-Ala-Gly-Ser(tBu)-Leu-Gln(Trt)-Pro-Leu-Ala-Leu-Glu(OtBu)-Gly-Ser(tBu)-Leu-Gln(Trt)-CTC Resin
H2N-Ala-Glu(OtBu)-Asp(OtBu)-Leu-Gln(Trt)-Val-Gly-Gln(Trt)-Val-Glu(OtBu)-Leu-Gly-Gly-Gly-Pro-Gly-Ala-Gly-Ser(tBu)-Leu-Gln(Trt)-Pro-Leu-Ala-Leu-Glu(OtBu)-Gly-Ser(tBu)-Leu-Gln(Trt)-CTC Resin
Fmoc-Glu(OtBu)-Ala-Glu(OtBu)-Asp(OtBu)-Leu-Gln(Trt)-Val-Gly-Gln(Trt)-Val-Glu(OtBu)-Leu-Gly-Gly-Gly-Pro-Gly-Ala-Gly-Ser(tBu)-Leu-Gln(Trt)-Pro-Leu-Ala-Leu-Glu(OtBu)-Gly-Ser(tBu)-Leu-Gln(Trt)-CTC 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-Glu(OtBu)-Ala-Glu(OtBu)-Asp(OtBu)-Leu-Gln(Trt)-Val-Gly-Gln(Trt)-Val-Glu(OtBu)-Leu-Gly-Gly-Gly-Pro-Gly-Ala-Gly-Ser(tBu)-Leu-Gln(Trt)-Pro-Leu-Ala-Leu-Glu(OtBu)-Gly-Ser(tBu)-Leu-Gln(Trt)-CTC 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-Glu-Ala-Glu-Asp-Leu-Gln-Val-Gly-Gln-Val-Glu-Leu-Gly-Gly-Gly-Pro-Gly-Ala-Gly-Ser-Leu-Gln-Pro-Leu-Ala-Leu-Glu-Gly-Ser-Leu-Gln-COOH。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，甲基化修饰肽等。
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