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. 1995 Nov 21;92(24):11185–11189. doi: 10.1073/pnas.92.24.11185

Identification of residues linked to the slow-->fast transition of thrombin.

E R Guinto 1, A Vindigni 1, Y M Ayala 1, Q D Dang 1, E Di Cera 1
PMCID: PMC40596  PMID: 7479962

Abstract

Residues energetically linked to the allosteric transition of thrombin from its anticoagulant slow form to the procoagulant fast form have been identified by site-directed mutagenesis. The energetics of recognition by the two forms of the enzyme were probed by using a synthetic chromogenic substrate, fibrinogen, and hirudin. The thrombin residues E39, W60d, E192, D221, and D222 are linked to the slow-->fast transition and are part of an "allosteric core" through which events originating at the Na+ binding loop propagate to other regions of the enzyme. The thrombin residues Y76, W96, W148, and R173 lie at the periphery of the allosteric core, affect recognition of fibrinogen and hirudin to the same extent in both forms, and are not linked to the slow-->fast transition.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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