A novel high-yield synthesis of aminoacyl <i>p</i>-nitroanilines and aminoacyl 7-amino-4-methylcoumarins: Important synthons for the synthesis of chromogenic/fluorogenic protease substrates
作者:Xinghua Wu、Yu Chen、Herve Aloysius、Longqin Hu
DOI:10.3762/bjoc.7.117
日期:——
Common protecting groups used in amino acid/peptide chemistry were all well-tolerated. The method was also successfully applied to the synthesis of a dipeptide conjugate, indicating that the methodology is applicable to the synthesis of chromogenic substrates containing short peptides. The method has general applicability to the synthesis of chromogenic and fluorogenic peptide substrates and represents
glucoconjugates 2 and 3 with promising antitumor activities in vivo. These results prompted us to investigate the importance of the spacer in this tumor-targeting glucose-based conjugates. Here we report the chemical synthesis and an in vitro cytotoxicity evaluation, using a 5-member panel of human tumor cell lines and human fibroblasts, of 16 new CLB glucoconjugates in which the alkylating drug is attached to
Various peptide anilides were synthesized by a conventional method with the object of obtaining specific substrates for human spleen fibrinolytic proteinase (SFP) and human leukocyte elastase (LE) in order to compare the substrate specificity of SFP with that of LE. It was found that the P1 Val compound among succinyl tripeptide p-nitroanilides (Suc-Tyr-Leu-X-pNA) exhibited the highest kcat/Km values for hydrolysis by SFP and LE, however, the tetrapeptide Suc-Ala-Tyr-Leu-Val-pNA [kcat/Km values (M-1S-1) for hydrolysis by SFP and LE : 84000 and 48000, respectively] was the preferred chromogenic substrate for SFP and LE because of its high solubility in the buffer and its moderate kcat/Km values. The substrate specificity of SFP was found to be similar to that of LE.