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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 alpha-chymotrypsin with Ki values of 2.2 x 10(-5) and 7.2 x 10(-6) M, respectively, although eglin c itself inhibited leukocyte elastase, cathepsin G and alpha-chymotrypsin with Ki values of 6.0 x 10(-9), 5.5 x 10(-9) and 2.5 x 10(-9) M, 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 alpha-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.

chemical and pharmaceutical bulletin/chemical and pharmaceutical bulletin

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.