Boc/Tos-L-Phe-L-Arg-Xaa tripeptides (where Xaa = L-Ala-OBut, L-Ala, or DL-Ala(P)(OC2H5)(2)) were synthesized by conventional methods of peptide synthesis in solution. Special features of their interaction with thrombin and trypsin were studied. Unlike trypsin, thrombin did not catalyze the hydrolysis of the L-Arg-L-Ala(P)(OC2H5)(2) bond. The Tos-L-Phe-L-Arg-DL-Ala(P)(OC2H5)(2) peptide was the most active inhibitor of thrombin among all the compounds studied. The relationship between the structure and inhibitory action of the synthesized peptides is discussed(2).
Synth�se de laL-histidyl-L-ph�nylalanyl-L-arginyl-L-tryptophanyl-glycyl-?-CBO-L-lysyl-L-prolyl-L-valylamide
摘要:
AbstractTrityl‐glycyl‐ϵ‐CBO‐L‐lysine is condensed with L‐prolyl‐L‐valine methyl ester and, after amidification and splitting of the trityl group, glycyl‐ϵ‐CBO‐L‐lysyl‐L‐prolyl‐L‐valylamide is obtained. This is condensed with ditrityl‐L‐histidyl‐L‐phenylalanyl‐L‐arginyl‐L‐tryptophane prepared by condensation of ditrityl‐L‐histidyl‐L‐phenylalanine with L‐arginyl‐L‐tryptophane methyl ester and saponification. Dicyclohexyl‐carbodiimide is used as a condensing agent. After splitting off the trityl groups, the final octapeptide, L‐histidyl‐L‐phenylalanyl‐L‐arginyl‐L‐tryptophanyl‐glycyl‐ϵ‐CBO‐L‐lysyl‐L‐prolyl‐L‐valylamide is shown to be optically pure by leucine‐aminopeptidase digestion.