Poststatin, a new inhibitor of prolyl endopeptidase, produced by Streptomyces viridochromogenes MH534-30F3. II. Structure determination and inhibitory activities.

The Journal of Antibiotics
1991.0

Abstract

Poststatin, a new inhibitor of prolyl endopeptidase, has been isolated from the culture broth of Streptomyces viridochromogenes MH534-30F3. The structure of poststatin was defined as L-valyl-L-valyl-3-amino-2-oxovaleryl-D-leucyl-L-valine by analysis of spectral properties and chemical studies of poststatin and its derivatives. The alpha-keto group of postine in poststatin plays the most important role on the inhibitory mechanism.

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