Overview:
Lysyl-endopeptidase (Lys-c) was isolated from the Gram-negative soil bacterium Achromobacter lyticus by Masaki et al. The protein hydrolyzes amide and peptide ester bonds at the carboxylic side of lysine and S-aminoethylcysteine residues making it an important tool for enzymatic protein sequencing and Lys-X compound synthesis. The enzyme functions optimally between 30 – 37oC and suffers from degradation when subjected to temperatures above 50oC.Lysyl-endopeptidase retains complete activity after incubation in 4M urea or in 0.1% SDS solution for up to 6 hours at 30oC. Conversely, the enzyme is inhibited by DFP, PMSF, TLCK. Lysyl-endopeptidase is involved during the production of recombinant insulin and in proteomics research.
Gene Aliases:
API, Protease I, Lysyl endopeptidase
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没有这8种氨基酸就会发生由于缺乏营养所引起的疾病;氨基酸在医药上也有很大的用途,现在手术中输液都加有各种氨基酸,使患者的抵抗力增强,同时也增加营养。随着人民生活水平的提高,人们对摄入的营养物质的要求越来越高,尤其是幼儿、青少年的健康成长,疾病患者的康复,都迫切需要高质量的营养物质,所以有效开发氨基酸食品是很有必要的。
只有9个氨基酸,分子量1KD左右,想免疫小鼠制备单抗,有没有前辈做过这方面的东西?想了一些方法,但价值不大,请前辈们指教,不甚感激。
采用OPA柱前衍生,波长是338nm
流动相A:20mmol/LNaH2PO4(用10mol/LNaOH溶液调pH至7.8±0.2);
流动相B:甲醇:乙腈:水=(45:45:10,V/V/V);
柱温:40℃;
然后进其他单标氨基酸的时候都没有问题,但是进单标胱氨酸的时候,HPLC色谱图中出了两峰,为什么会有两峰?这两峰分别是什么峰?其中一个是半胱氨酸的峰吗?用何种方法可以确定这两个分别是什么峰?
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