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文献和实验Cyclization via the acyl azide(X=Z or Boc,R=Me,Et,Bzl) Bodansky最早应用迭氮法合成了cyclo(D-Ala-D-Ala-Val-D-Leu-Ile),虽然上述环肽不具有其母体化合物malformin的生物活性,但合成它为应用迭氮法合成环肽开辟了前景。 应用迭氮法合成环肽的另一个成功的例子是内皮素拮抗剂的合成。Endothelin(ET)是一种高效的血管收缩剂,由21个氨基酸残基组成,其受体拮抗剂之一cyclo(D-Trp-D-Asp(OtBu
Factor Xa Cleavage of MBP-Fusion protein
for each system. Samples must be removed at various time points and analyzed by PAGE-SDS to estimate the yield, purity and extent of factor Xa digestion. Factor Xa cleaves after the Arg residue in the cleavage site Ile-(Glu or Asp)-Gly-Arg. Ile and Thr are prefered
Small scale His-Tag fusion protein purification under denaturative conditions
4 + buffers and amino acids as Arg, Glu, Gly or His. Procedure 1 Resuspend pellet of 10ml bacterial culture (or 100ml bacterial culture for very low expression level) in 1ml lysis buffer 2 Prepare lysis buffer containing urea
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