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Title: High molecular weight kininogen as substrate for cathepsin B
Authors: Barros, NMT
Tersariol, ILS
Oliva, MLV
Araujo, M. S.
Sampaio, CAM
Juliano, L.
Motta, G. da
Universidade Federal de São Paulo (UNIFESP)
Keywords: cystatins
cysteine peptidase
Issue Date: 1-Jun-2004
Publisher: Walter de Gruyter & Co
Citation: Biological Chemistry. Berlin: Walter de Gruyter & Co, v. 385, n. 6, p. 551-555, 2004.
Abstract: We investigated the influence of pH and divalent cations (Zn2+, Mg2+ and Ca2+) on high molecular weight kininogen processing by cathepsin B. At pH 6.3, high molecular weight kininogen is hydrolyzed by cathepsin B at three sites generating fragments of 80, 60 and 40 kDa. Cathepsin B has kininogenase activity at this pH which is improved in the absence of divalent cations. At pH 7.35, high molecular weight kininogen is slightly cleaved by cathepsin B into fragments of 60 kDa, and cathepsin B kininogenase activity is impaired. Our results suggest that high molecular weight kininogen is a substrate for cathepsin B under pathophysiological conditions.
ISSN: 1431-6730
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