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Protein & Peptide Letters

Editor-in-Chief

ISSN (Print): 0929-8665
ISSN (Online): 1875-5305

Studies on the Interaction of Papain with Human Placental Cystatin by Uv, Fluorescence and Cd Spectroscopy

Author(s): Fouzia Rashid, S. P. Baba, Sandeep Sharma and B. Bano

Volume 11, Issue 6, 2004

Page: [583 - 591] Pages: 9

DOI: 10.2174/0929866043406364

Price: $65

Abstract

The interaction of activated papain with low molecular weight cystatin (Mr 12500) purified from human placenta has been studied. Analysis of inhibition of caesinolytic activity of papain by cystatin showed stoichiometry of 1:1. Kinetic studies gave an inhibition constant (Ki) value of 5.5 x 10 -8 M and association rate constant (K+1) value of 3.4 x 10 4 (M-1 s-1). All spectroscopic studies showed conformational changes in both papain and cystatin on formation of complex. The data suggest perturbation of environment of aromatic residues and change of their native structure and conformation thereby shedding light on the behaviour of cystatins, especially interaction of placental cystatin with thiol protease inhibitors.

Keywords: cystatin, far uv-cd spectroscopy, fluorescence emission, human placenta, papain, uvabsorption


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