Oxidation of Human α-Thrombin by the Myeloperoxidase-H2O2-chloride System: Structural and Functional Effects

Raimondo De Cristofaro; Raffaele Landolfi

doi:10.1055/s-0037-1613796

Thrombosis and Haemostasis, Inhaltsverzeichnis

Thromb Haemost 2000; 83(02): 253-261
DOI: 10.1055/s-0037-1613796

Rapid Communication

Schattauer GmbH

Oxidation of Human α-Thrombin by the Myeloperoxidase-H₂O₂-chloride System: Structural and Functional Effects

Raimondo De Cristofaro

¹From the Hemostasis Research Center, Department of Internal Medicine, Catholic University School of Medicine, Rome, Italy

,

Raffaele Landolfi

¹From the Hemostasis Research Center, Department of Internal Medicine, Catholic University School of Medicine, Rome, Italy

› Institutsangaben

Abstract

Summary

The myeloperoxidase-H₂O₂-chloride system (MPOS) is exploited by white blood cells to generate reactive oxygen species in many processes involved in the pathogenesis of inflammation and atherothrombosis. This study investigated the biochemical and functional effects of α-thrombin oxidation by MPOS. This system, in the presence of 100 µM L-tyrosine, caused in the thrombin molecule loss of tryptophan and lysine residues and formation of dityrosine, chloramine and carbonyl groups. The same changes could be directly induced by thrombin incubation with reagent HOCl, but not with H₂O₂ alone. Exposure to either MPOS or HOCl caused major functional abnormalities in human α-thrombin. The interaction of oxidized (ox-)thrombin with Protein C and antithrombin III-heparin complex were most sensitive to oxidation, being the k_cat/K_m value for Protein C hydrolysis roughly reduced 13-fold and the affinity for the antithrombin III-heparin complex decreased approximately 15-fold. Ox-thrombin interaction with small synthetic peptides showed several changes, arising from a perturbation of the S2-S3 specificity of the enzyme. Ox-thrombin was also characterized by a 5-fold decrease of the k_cat/K_m value for both fibrinopeptide A and B release from fibrinogen, a 5.8-fold increase of the EC₅₀ value for platelet activation and a 2-fold decrease of binding affinity for thrombomodulin. The above results indicate a high sensitivity of thrombin to oxidative modifications by myeloperoxidase. Perturbed interactions with Protein C and the heparin-ATIII complex were the most relevant functional abnormalities of ox-thrombin.

Abbreviations: DNPH: 2,4-dinitrophenylhydrazine; FpA: fibrinopeptide A; FpB: fibrinopeptide B; FRS: Fibrinogen recognition Site; GpIb: Glycoprotein Ib; HBS: Heparin Binding Site; MPO: myeloperoxidase; MPOS: Myeloperoxidase System; Pip: Pipecolynic acid; PMN: polymorphonuclear cells; pNA: para-nitroaniline; PPACK: Phenylalanine-Proline-Arginine-Chloromethyl-Ketone; TM: Thrombomodulin; TNB: 5-thio-2-nitrobenzoic acid; TPCK: N-tosyl-L-Phenylalanine-Chloromethyl-Ketone. Thrombin residues are numbered according to the chymotrypsin numbering system (31).

Key words

Thrombin - myeloperoxidase - protein oxidation

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Referenzen

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