专肽生物_定制多肽合成服务_多肽合成定制服务_多肽合成厂家_多肽合成公司

C-Peptide 2, rat 是一种由 31 个氨基酸残基构成的多肽，是胰岛素原的一种组分。C-Peptide 2, rat 可抑制葡萄糖诱导的胰岛素分泌。

C-Peptide 2, rat, 31-amino-acid peptide, is a component of proinsulin. C-Peptide 2, rat can inhibit glucose-induced insulin secretion.

C肽2（大鼠）是一种由31个氨基酸残基组成的肽，可有效提高链脲佐菌素诱导的糖尿病大鼠的葡萄糖利用率。它是胰岛素原的一种成分，可以抑制葡萄糖诱导的胰岛素分泌。

C-Peptide 2 (rat), a peptide composed of 31 amino acid residues, can effectively improve glucose utilization in streptozotocin induced diabetic rats. It is a component of proinsulin, and can inhibit glucose-induced insulin secretion.

Toyota T, et, al. Inhibitory action of rat insulin and synthetic rat C-peptide on insulin secretion in the perfused rat pancreas. Acta Diabetol Lat. Sep-Dec 1977; 14(5-6): 250-6. : https://pubmed.ncbi.nlm.nih.gov/349994/
Wójcikowski C, et, al. Effects of synthetic rat C-peptide in normal and diabetic rats. Diabetologia. 1983 Sep;25(3):288-90. : https://pubmed.ncbi.nlm.nih.gov/6139319/

多肽H2N-Glu-Val-Glu-Asp-Pro-Gln-Val-Ala-Gln-Leu-Glu-Leu-Gly-Gly-Gly-Pro-Gly-Ala-Gly-Asp-Leu-Gln-Thr-Leu-Ala-Leu-Glu-Val-Ala-Arg-Gln-COOH的合成步骤：

1、合成CTC树脂：称取0.72g CTC Resin（如初始取代度约为0.87mmol/g）和0.75mmol 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1.88mmol 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1.88mmol Fmoc-Arg(Pbf)-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3.76mmol DIPEA，1.79mmol 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-Arg(Pbf)-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-Arg(Pbf)-Gln(Trt)-CTC Resin

Fmoc-Ala-Arg(Pbf)-Gln(Trt)-CTC Resin

H2N-Ala-Arg(Pbf)-Gln(Trt)-CTC Resin

Fmoc-Val-Ala-Arg(Pbf)-Gln(Trt)-CTC Resin

H2N-Val-Ala-Arg(Pbf)-Gln(Trt)-CTC Resin

Fmoc-Glu(OtBu)-Val-Ala-Arg(Pbf)-Gln(Trt)-CTC Resin

H2N-Glu(OtBu)-Val-Ala-Arg(Pbf)-Gln(Trt)-CTC Resin

Fmoc-Leu-Glu(OtBu)-Val-Ala-Arg(Pbf)-Gln(Trt)-CTC Resin

H2N-Leu-Glu(OtBu)-Val-Ala-Arg(Pbf)-Gln(Trt)-CTC Resin

Fmoc-Ala-Leu-Glu(OtBu)-Val-Ala-Arg(Pbf)-Gln(Trt)-CTC Resin

H2N-Ala-Leu-Glu(OtBu)-Val-Ala-Arg(Pbf)-Gln(Trt)-CTC Resin

Fmoc-Leu-Ala-Leu-Glu(OtBu)-Val-Ala-Arg(Pbf)-Gln(Trt)-CTC Resin

H2N-Leu-Ala-Leu-Glu(OtBu)-Val-Ala-Arg(Pbf)-Gln(Trt)-CTC Resin

Fmoc-Thr(tBu)-Leu-Ala-Leu-Glu(OtBu)-Val-Ala-Arg(Pbf)-Gln(Trt)-CTC Resin

H2N-Thr(tBu)-Leu-Ala-Leu-Glu(OtBu)-Val-Ala-Arg(Pbf)-Gln(Trt)-CTC Resin

Fmoc-Gln(Trt)-Thr(tBu)-Leu-Ala-Leu-Glu(OtBu)-Val-Ala-Arg(Pbf)-Gln(Trt)-CTC Resin

H2N-Gln(Trt)-Thr(tBu)-Leu-Ala-Leu-Glu(OtBu)-Val-Ala-Arg(Pbf)-Gln(Trt)-CTC Resin

Fmoc-Leu-Gln(Trt)-Thr(tBu)-Leu-Ala-Leu-Glu(OtBu)-Val-Ala-Arg(Pbf)-Gln(Trt)-CTC Resin

H2N-Leu-Gln(Trt)-Thr(tBu)-Leu-Ala-Leu-Glu(OtBu)-Val-Ala-Arg(Pbf)-Gln(Trt)-CTC Resin

Fmoc-Asp(OtBu)-Leu-Gln(Trt)-Thr(tBu)-Leu-Ala-Leu-Glu(OtBu)-Val-Ala-Arg(Pbf)-Gln(Trt)-CTC Resin

H2N-Asp(OtBu)-Leu-Gln(Trt)-Thr(tBu)-Leu-Ala-Leu-Glu(OtBu)-Val-Ala-Arg(Pbf)-Gln(Trt)-CTC Resin

Fmoc-Gly-Asp(OtBu)-Leu-Gln(Trt)-Thr(tBu)-Leu-Ala-Leu-Glu(OtBu)-Val-Ala-Arg(Pbf)-Gln(Trt)-CTC Resin

H2N-Gly-Asp(OtBu)-Leu-Gln(Trt)-Thr(tBu)-Leu-Ala-Leu-Glu(OtBu)-Val-Ala-Arg(Pbf)-Gln(Trt)-CTC Resin

Fmoc-Ala-Gly-Asp(OtBu)-Leu-Gln(Trt)-Thr(tBu)-Leu-Ala-Leu-Glu(OtBu)-Val-Ala-Arg(Pbf)-Gln(Trt)-CTC Resin

H2N-Ala-Gly-Asp(OtBu)-Leu-Gln(Trt)-Thr(tBu)-Leu-Ala-Leu-Glu(OtBu)-Val-Ala-Arg(Pbf)-Gln(Trt)-CTC Resin

Fmoc-Gly-Ala-Gly-Asp(OtBu)-Leu-Gln(Trt)-Thr(tBu)-Leu-Ala-Leu-Glu(OtBu)-Val-Ala-Arg(Pbf)-Gln(Trt)-CTC Resin

H2N-Gly-Ala-Gly-Asp(OtBu)-Leu-Gln(Trt)-Thr(tBu)-Leu-Ala-Leu-Glu(OtBu)-Val-Ala-Arg(Pbf)-Gln(Trt)-CTC Resin

Fmoc-Pro-Gly-Ala-Gly-Asp(OtBu)-Leu-Gln(Trt)-Thr(tBu)-Leu-Ala-Leu-Glu(OtBu)-Val-Ala-Arg(Pbf)-Gln(Trt)-CTC Resin

H2N-Pro-Gly-Ala-Gly-Asp(OtBu)-Leu-Gln(Trt)-Thr(tBu)-Leu-Ala-Leu-Glu(OtBu)-Val-Ala-Arg(Pbf)-Gln(Trt)-CTC Resin

Fmoc-Gly-Pro-Gly-Ala-Gly-Asp(OtBu)-Leu-Gln(Trt)-Thr(tBu)-Leu-Ala-Leu-Glu(OtBu)-Val-Ala-Arg(Pbf)-Gln(Trt)-CTC Resin

H2N-Gly-Pro-Gly-Ala-Gly-Asp(OtBu)-Leu-Gln(Trt)-Thr(tBu)-Leu-Ala-Leu-Glu(OtBu)-Val-Ala-Arg(Pbf)-Gln(Trt)-CTC Resin

Fmoc-Gly-Gly-Pro-Gly-Ala-Gly-Asp(OtBu)-Leu-Gln(Trt)-Thr(tBu)-Leu-Ala-Leu-Glu(OtBu)-Val-Ala-Arg(Pbf)-Gln(Trt)-CTC Resin

H2N-Gly-Gly-Pro-Gly-Ala-Gly-Asp(OtBu)-Leu-Gln(Trt)-Thr(tBu)-Leu-Ala-Leu-Glu(OtBu)-Val-Ala-Arg(Pbf)-Gln(Trt)-CTC Resin

Fmoc-Gly-Gly-Gly-Pro-Gly-Ala-Gly-Asp(OtBu)-Leu-Gln(Trt)-Thr(tBu)-Leu-Ala-Leu-Glu(OtBu)-Val-Ala-Arg(Pbf)-Gln(Trt)-CTC Resin

H2N-Gly-Gly-Gly-Pro-Gly-Ala-Gly-Asp(OtBu)-Leu-Gln(Trt)-Thr(tBu)-Leu-Ala-Leu-Glu(OtBu)-Val-Ala-Arg(Pbf)-Gln(Trt)-CTC Resin

Fmoc-Leu-Gly-Gly-Gly-Pro-Gly-Ala-Gly-Asp(OtBu)-Leu-Gln(Trt)-Thr(tBu)-Leu-Ala-Leu-Glu(OtBu)-Val-Ala-Arg(Pbf)-Gln(Trt)-CTC Resin

H2N-Leu-Gly-Gly-Gly-Pro-Gly-Ala-Gly-Asp(OtBu)-Leu-Gln(Trt)-Thr(tBu)-Leu-Ala-Leu-Glu(OtBu)-Val-Ala-Arg(Pbf)-Gln(Trt)-CTC Resin

Fmoc-Glu(OtBu)-Leu-Gly-Gly-Gly-Pro-Gly-Ala-Gly-Asp(OtBu)-Leu-Gln(Trt)-Thr(tBu)-Leu-Ala-Leu-Glu(OtBu)-Val-Ala-Arg(Pbf)-Gln(Trt)-CTC Resin

H2N-Glu(OtBu)-Leu-Gly-Gly-Gly-Pro-Gly-Ala-Gly-Asp(OtBu)-Leu-Gln(Trt)-Thr(tBu)-Leu-Ala-Leu-Glu(OtBu)-Val-Ala-Arg(Pbf)-Gln(Trt)-CTC Resin

Fmoc-Leu-Glu(OtBu)-Leu-Gly-Gly-Gly-Pro-Gly-Ala-Gly-Asp(OtBu)-Leu-Gln(Trt)-Thr(tBu)-Leu-Ala-Leu-Glu(OtBu)-Val-Ala-Arg(Pbf)-Gln(Trt)-CTC Resin

H2N-Leu-Glu(OtBu)-Leu-Gly-Gly-Gly-Pro-Gly-Ala-Gly-Asp(OtBu)-Leu-Gln(Trt)-Thr(tBu)-Leu-Ala-Leu-Glu(OtBu)-Val-Ala-Arg(Pbf)-Gln(Trt)-CTC Resin

Fmoc-Gln(Trt)-Leu-Glu(OtBu)-Leu-Gly-Gly-Gly-Pro-Gly-Ala-Gly-Asp(OtBu)-Leu-Gln(Trt)-Thr(tBu)-Leu-Ala-Leu-Glu(OtBu)-Val-Ala-Arg(Pbf)-Gln(Trt)-CTC Resin

H2N-Gln(Trt)-Leu-Glu(OtBu)-Leu-Gly-Gly-Gly-Pro-Gly-Ala-Gly-Asp(OtBu)-Leu-Gln(Trt)-Thr(tBu)-Leu-Ala-Leu-Glu(OtBu)-Val-Ala-Arg(Pbf)-Gln(Trt)-CTC Resin

Fmoc-Ala-Gln(Trt)-Leu-Glu(OtBu)-Leu-Gly-Gly-Gly-Pro-Gly-Ala-Gly-Asp(OtBu)-Leu-Gln(Trt)-Thr(tBu)-Leu-Ala-Leu-Glu(OtBu)-Val-Ala-Arg(Pbf)-Gln(Trt)-CTC Resin

H2N-Ala-Gln(Trt)-Leu-Glu(OtBu)-Leu-Gly-Gly-Gly-Pro-Gly-Ala-Gly-Asp(OtBu)-Leu-Gln(Trt)-Thr(tBu)-Leu-Ala-Leu-Glu(OtBu)-Val-Ala-Arg(Pbf)-Gln(Trt)-CTC Resin

Fmoc-Val-Ala-Gln(Trt)-Leu-Glu(OtBu)-Leu-Gly-Gly-Gly-Pro-Gly-Ala-Gly-Asp(OtBu)-Leu-Gln(Trt)-Thr(tBu)-Leu-Ala-Leu-Glu(OtBu)-Val-Ala-Arg(Pbf)-Gln(Trt)-CTC Resin

H2N-Val-Ala-Gln(Trt)-Leu-Glu(OtBu)-Leu-Gly-Gly-Gly-Pro-Gly-Ala-Gly-Asp(OtBu)-Leu-Gln(Trt)-Thr(tBu)-Leu-Ala-Leu-Glu(OtBu)-Val-Ala-Arg(Pbf)-Gln(Trt)-CTC Resin

Fmoc-Gln(Trt)-Val-Ala-Gln(Trt)-Leu-Glu(OtBu)-Leu-Gly-Gly-Gly-Pro-Gly-Ala-Gly-Asp(OtBu)-Leu-Gln(Trt)-Thr(tBu)-Leu-Ala-Leu-Glu(OtBu)-Val-Ala-Arg(Pbf)-Gln(Trt)-CTC Resin

H2N-Gln(Trt)-Val-Ala-Gln(Trt)-Leu-Glu(OtBu)-Leu-Gly-Gly-Gly-Pro-Gly-Ala-Gly-Asp(OtBu)-Leu-Gln(Trt)-Thr(tBu)-Leu-Ala-Leu-Glu(OtBu)-Val-Ala-Arg(Pbf)-Gln(Trt)-CTC Resin

Fmoc-Pro-Gln(Trt)-Val-Ala-Gln(Trt)-Leu-Glu(OtBu)-Leu-Gly-Gly-Gly-Pro-Gly-Ala-Gly-Asp(OtBu)-Leu-Gln(Trt)-Thr(tBu)-Leu-Ala-Leu-Glu(OtBu)-Val-Ala-Arg(Pbf)-Gln(Trt)-CTC Resin

H2N-Pro-Gln(Trt)-Val-Ala-Gln(Trt)-Leu-Glu(OtBu)-Leu-Gly-Gly-Gly-Pro-Gly-Ala-Gly-Asp(OtBu)-Leu-Gln(Trt)-Thr(tBu)-Leu-Ala-Leu-Glu(OtBu)-Val-Ala-Arg(Pbf)-Gln(Trt)-CTC Resin

Fmoc-Asp(OtBu)-Pro-Gln(Trt)-Val-Ala-Gln(Trt)-Leu-Glu(OtBu)-Leu-Gly-Gly-Gly-Pro-Gly-Ala-Gly-Asp(OtBu)-Leu-Gln(Trt)-Thr(tBu)-Leu-Ala-Leu-Glu(OtBu)-Val-Ala-Arg(Pbf)-Gln(Trt)-CTC Resin

H2N-Asp(OtBu)-Pro-Gln(Trt)-Val-Ala-Gln(Trt)-Leu-Glu(OtBu)-Leu-Gly-Gly-Gly-Pro-Gly-Ala-Gly-Asp(OtBu)-Leu-Gln(Trt)-Thr(tBu)-Leu-Ala-Leu-Glu(OtBu)-Val-Ala-Arg(Pbf)-Gln(Trt)-CTC Resin

Fmoc-Glu(OtBu)-Asp(OtBu)-Pro-Gln(Trt)-Val-Ala-Gln(Trt)-Leu-Glu(OtBu)-Leu-Gly-Gly-Gly-Pro-Gly-Ala-Gly-Asp(OtBu)-Leu-Gln(Trt)-Thr(tBu)-Leu-Ala-Leu-Glu(OtBu)-Val-Ala-Arg(Pbf)-Gln(Trt)-CTC Resin

H2N-Glu(OtBu)-Asp(OtBu)-Pro-Gln(Trt)-Val-Ala-Gln(Trt)-Leu-Glu(OtBu)-Leu-Gly-Gly-Gly-Pro-Gly-Ala-Gly-Asp(OtBu)-Leu-Gln(Trt)-Thr(tBu)-Leu-Ala-Leu-Glu(OtBu)-Val-Ala-Arg(Pbf)-Gln(Trt)-CTC Resin

Fmoc-Val-Glu(OtBu)-Asp(OtBu)-Pro-Gln(Trt)-Val-Ala-Gln(Trt)-Leu-Glu(OtBu)-Leu-Gly-Gly-Gly-Pro-Gly-Ala-Gly-Asp(OtBu)-Leu-Gln(Trt)-Thr(tBu)-Leu-Ala-Leu-Glu(OtBu)-Val-Ala-Arg(Pbf)-Gln(Trt)-CTC Resin

H2N-Val-Glu(OtBu)-Asp(OtBu)-Pro-Gln(Trt)-Val-Ala-Gln(Trt)-Leu-Glu(OtBu)-Leu-Gly-Gly-Gly-Pro-Gly-Ala-Gly-Asp(OtBu)-Leu-Gln(Trt)-Thr(tBu)-Leu-Ala-Leu-Glu(OtBu)-Val-Ala-Arg(Pbf)-Gln(Trt)-CTC Resin

Fmoc-Glu(OtBu)-Val-Glu(OtBu)-Asp(OtBu)-Pro-Gln(Trt)-Val-Ala-Gln(Trt)-Leu-Glu(OtBu)-Leu-Gly-Gly-Gly-Pro-Gly-Ala-Gly-Asp(OtBu)-Leu-Gln(Trt)-Thr(tBu)-Leu-Ala-Leu-Glu(OtBu)-Val-Ala-Arg(Pbf)-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)-Val-Glu(OtBu)-Asp(OtBu)-Pro-Gln(Trt)-Val-Ala-Gln(Trt)-Leu-Glu(OtBu)-Leu-Gly-Gly-Gly-Pro-Gly-Ala-Gly-Asp(OtBu)-Leu-Gln(Trt)-Thr(tBu)-Leu-Ala-Leu-Glu(OtBu)-Val-Ala-Arg(Pbf)-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-Val-Glu-Asp-Pro-Gln-Val-Ala-Gln-Leu-Glu-Leu-Gly-Gly-Gly-Pro-Gly-Ala-Gly-Asp-Leu-Gln-Thr-Leu-Ala-Leu-Glu-Val-Ala-Arg-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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