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- 详细信息
- 文献和实验
- 技术资料
- 库存：
大量
- 英文名：
Trypsin from porcine pancreas
- CAS号：
9002-07-7
- 保质期：
2年
- 供应商：
上海瓦兰生物
- 保存条件：
-20°
- 规格：
1G
性质
| Related Categories | 3.4.x.x Peptidases, 3.x.x.x Hydrolases, Analytical and Industrial Enzymes, Application Index, BRDU 细胞增殖检测试剂, 更多... |
| type | Type II-S |
| form | lyophilized powder |
| mol wt | mol wt 23.8 kDa |
| storage temp. | −20°C |
产品描述
Components
Trypsin consists of a single chain polypeptide of 223 amino acid residues, produced by the removal of the N-terminal hexapeptide from trypsinogen which is cleaved at the Lys - lle peptide bond. The sequence of amino acids is cross-linked by 6 disulfide bridges. This is the native form of trypsin, beta-trypsin. BETA-trypsin can be autolyzed, cleaving at the Lys - Ser residue, to produce alpha-trypsin. Trypsin is a member of the serine protease family.
Caution
Solutions in 1 mM HCl are stable for 1 year in aliquots and stored at -20°C. The presence of Ca2+ will also diminish the self-autolysis of trypsin and maintain its stability in solution. Trypsin will also retain most of its activity in 2.0 M urea, 2.0 M guanidine HCl, or 0.1% (w/v) SDS.
包装
1, 10, 100 g in poly bottle
Preparation Note
This product is a lyophilized powder soluble in Hank′s Balanced Salt Solution at 25 mg/mL.
Unit Definition
One BAEE unit will produce a ΔA253 of 0.001 per min at pH 7.6 at 25° C using BAEE as substrate. One BTEE unit = 320 ATEE units. Reaction volume = 3.2 mL (1 cm light path).
Application
For trypsin digestion of peptides, use a ratio of about 1:100 to 1:20 for trypsin:peptide. The typical use for this product is in removing adherent cells from a culture surface. The concentration of trypsin necessary to dislodge cells from their substrate is dependent primarily on the cell type and the age of the culture. Trypsins have also been used for the re-suspension of cells during cell culture, in proteomics research for digestion of proteins and in various in-gel digestionsns†. Additional applications include assessing crystallization by membrane-based techniques and in a study to determine that protein folding rates and yields can be limited by the presence of kinetic traps.
Biochem/physiol Actions
Trypsin cleaves peptides on the C-terminal side of lysine and arginine residues. The rate of hydrolysis of this reaction is slowed if an acidic residue is on either side of the cleavage site and hydrolysis is stopped if a proline residue is on the carboxyl side of the cleavage site. The optimal pH for trypsin activity is 7-9. Trypsin can also act to cleave ester and amide linkages of synthetic derivatives of amino acids. EDTA is added to trypsin solutions as a chelating agent that neutralizes calcium and magnesium ions that obscure the peptide bonds on which trypsin acts. Removing these ions increases the enzymatic activity.
Serine protease inhibitors, including DFP, TLCK, APMSF, AEBSEF, and aprotinin, amongst others, will inhibit Trypsin.
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文献和实验［原理］ 在动物胰脏中除了存在胰蛋白酶外，还有另外两种与胰蛋白酶性质相似的蛋白水解酶：胰凝乳蛋白酶和弹性蛋白酶。在胰蛋白酶提取过程中，三者彼此很难分开。需采用合适的方法进一步分离纯化。 从动物胰脏中提取胰蛋白酶，一般是用稀酸将胰腺细胞中含有的胰蛋白酶原提取出来，然后根据等电点沉淀的原理将提取液的pH值调至酸性（pH3.0左右），使大量的酸性
样品：重组胰蛋白酶，比活 4500USP u/mg pro.，上海雅心生物技术有限公司，纯度如图 1 所示。BAEE，Sigma. 图 1. 重组胰蛋白酶的纯度的 SDS-PAGE 鉴定 1. 最适 pH 的研究 准备 pH 为 3~12 的底物 BAEE（0.25 mM），分别测定 rPT 纯酶液的活性，最后结果表示为测定数值占最高酶活的百分比。缓冲液成分依次为 25 mM NaAc-HAc (pH 3~6)，25 mM Tris-HCl (pH 7~8)，25
问：有人说白颜色胰蛋白酶的要比黄颜色的效果好，是吗？我近期买的胰蛋白酶倒是白颜色的，但是不能溶解在PBS中，呈细小的悬浮颗粒状，是GIBCO公司出产的。这会是什么原因呢？望各位师兄师姐回复。 答：以我们的经验确实是这样的，我们做过比较的是白颜色的比较好，究其原因我们认为是黄颜色的胰蛋白酶提纯不够，里面混有杂质所致。
技术资料