Amino acids and peptides. XXX. Synthesis of eglin c(41-49) and eglin c(60-63) and examination of their inhibitory activity towards human leukocyte elastase, cathepsin G, porcine pancreatic elastase and .ALPHA.-chymotrypsin.
Amino acids and peptides. XXX. Synthesis of eglin c(41-49) and eglin c(60-63) and examination of their inhibitory activity towards human leukocyte elastase, cathepsin G, porcine pancreatic elastase and .ALPHA.-chymotrypsin.
H-Ser-Pro-Val-Thr-Leu-Asp-Leu-Arg-Tyr-OH and H-Thr-Asn-Val-Val-OH, which correspond to the sequences 41-49 and 60-63 of eglin c, respectively, were synthesized by a conventional solution approach using the newly developed 6-chloro-2-pyridyl ester method. The inhibitory activities of the above two peptides against human leukocyte elastase, cathepsin G, porcine pancreatic elastase and α-chymotrypsin were examined in comparison with those of the corresponding methyl esters.
Amino Acids and Peptides. XXXVII. Synthesis of Stereoisomeric Nonapeptides Corresponding to Sequence 41-49 of Eglin c and Examination of Their Inhibitory Activity against Human Leukocyte Cathepsin G and .ALPHA.-Chymotrypsin.
A nonapeptide, H-Ser-Pro-Val-Thr-Leu-Asp-Leu-Arg-Tyr-OH, corresponding to sequence 41-49 of eglin c inhibited leukocyte cathepsin G and α-chymotrypsin with Ki values of 2.2×10-5 and 7.2×10-6M, respectively, although eglin c itself inhibited leukocyte elastase, cathepsin G and α-chymotrypsin with Ki values of 6.0×10-9, 5.5×10-9 and 2.5×10-9M, respectively. The inhibitory activity of the nonapeptide decreased following incubation with cathepsin G due to the cleavage of the Leu45-Asp46 peptide bond. Therefore, Leu45 and/or Asp46 were replaced with D-amino acids and the inhibitory activities of the resultant nonapeptides were examined. Their inhibitory activities against cathepsin G and α-chymotrypsin were much weaker than those of the all-L-type nonapeptide, suggesting that the amino acids at the active site, Leu45 and Asp46 are required to be in the L-configuration for potent activity.