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. 1990 Aug 15;270(1):83–90. doi: 10.1042/bj2700083

Kinetics of inhibition of platelet calpain II by human kininogens.

H N Bradford 1, A H Schmaier 1, R W Colman 1
PMCID: PMC1131681  PMID: 2396995

Abstract

The plasma kininogens, high-molecular-mass and low-molecular-mass kininogens, are the most potent plasma inhibitors of platelet calpain. We explored the kinetic mechanisms for kininogen inhibition of calpain by comparing calpain inactivation by human high-molecular-mass kininogen (HK) and human low-molecular-mass kininogen (LK). With a [14C]methylated alpha-casein substrate, the inhibition of calpain by HK did not follow classic Michaelis-Menten kinetics. With the use of a fluorogenic assay with the dipeptide substrate for calpain, 3-carboxypropionyl-leucyltyrosine 7-(4-methyl)coumarylamide, the inhibition by HK and LK fitted a kinetic model of tight-binding inhibition. LK was found to be a non-competitive inhibitor of platelet calpain with a Ki of 2.7 nM. HK showed mixed non-competitive inhibition of calpain with a Ki of 2.3 nM in the absence of substrate and Ki of 0.71 nM in the presence of saturating substrate, almost 4-fold tighter than LK. Proteolysis of HK by plasma and tissue kallikreins did not influence its ability to inhibit calpain. Digestion of the HK light chain by Factor XIa also did not alter its calpain-inhibitory function. These studies indicate that the kininogens are tight-binding non-competitive inhibitors of platelet calpain, the inhibitory domain in each case being mainly on the heavy chain. The light chain of HK appears to influence its kinetic behaviour.

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Selected References

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