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. 1990 Apr 1;267(1):79–84. doi: 10.1042/bj2670079

Differential interactions of human kallikrein-binding protein and alpha 1-antitrypsin with human tissue kallikrein.

L M Chen 1, L Chao 1, R K Mayfield 1, J Chao 1
PMCID: PMC1131247  PMID: 2327990

Abstract

The characteristics of a new kallikrein-binding protein in human serum and its activities were studied. Both the kallikrein-binding protein and alpha 1-antitrypsin form 92 kDa SDS-stable and heat-stable complexes with human tissue kallikrein. In non-SDS/PAGE, the mobility of these complexes differ. Complex-formation between kallikrein and the binding protein is inhibited by heparin, whereas that between kallikrein and alpha 1-antitrypsin is heparin-resistant. In normal or alpha 1-antitrypsin-deficient-serum, the amount of 92 kDa SDS-stable complex formed upon addition of kallikrein is not related to serum alpha 1-antitrypsin levels. The rate of complex-formation between kallikrein and the binding protein is 12 times higher than that between kallikrein and alpha 1-antitrypsin. Purified alpha 1-antitrypsin, which exhibits normal elastase binding, has a kallikrein-binding activity less than 5% of that of serum. Binding of tissue kallikrein in serum is not inhibited by increasing elastase concentrations, and elastase binding in serum is not inhibited by excess tissue kallikrein. A specific monoclonal antibody to human alpha 1-antitrypsin does not bind to either 92 kDa endogenous or exogenous kallikrein complexes isolated from human serum. The studies demonstrate a new tissue kallikrein-binding protein, distinct from alpha 1-antitrypsin, is present in human serum.

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