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Toxins 2017, 9(12), 392;

Direct Fibrinolytic Snake Venom Metalloproteinases Affecting Hemostasis: Structural, Biochemical Features and Therapeutic Potential

Research and Development Center, Ezequiel Dias Foundation, Belo Horizonte 30510-010, MG, Brazil
Graduate Program in Nursing, Federal University of Minas Gerais, Belo Horizonte 30130-100, MG, Brazil
Institute for Physiological Chemistry and Pathobiochemistry, University of Münster, 15, 48149 Muenster, Germany
Author to whom correspondence should be addressed.
Academic Editor: Steve Peigneur
Received: 25 October 2017 / Revised: 24 November 2017 / Accepted: 27 November 2017 / Published: 5 December 2017
(This article belongs to the Special Issue Toxins in Drug Discovery and Pharmacology)
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Snake venom metalloproteinases (SVMPs) are predominant in viperid venoms, which provoke hemorrhage and affect hemostasis and thrombosis. P-I class enzymes consist only of a single metalloproteinase domain. Despite sharing high sequence homology, only some of them induce hemorrhage. They have direct fibrin(ogen)olytic activity. Their main biological substrate is fibrin(ogen), whose Aα-chain is degraded rapidly and independently of activation of plasminogen. It is important to understand their biochemical and physiological mechanisms, as well as their applications, to study the etiology of some human diseases and to identify sites of potential intervention. As compared to all current antiplatelet therapies to treat cardiovascular events, the SVMPs have outstanding biochemical attributes: (a) they are insensitive to plasma serine proteinase inhibitors; (b) they have the potential to avoid bleeding risk; (c) mechanistically, they are inactivated/cleared by α2-macroglobulin that limits their range of action in circulation; and (d) few of them also impair platelet aggregation that represent an important target for therapeutic intervention. This review will briefly highlight the structure–function relationships of these few direct-acting fibrinolytic agents, including, barnettlysin-I, isolated from Bothrops barnetti venom, that could be considered as potential agent to treat major thrombotic disorders. Some of their pharmacological advantages are compared with plasmin. View Full-Text
Keywords: metalloproteinases; animal toxins; thrombolysis; antithrombotics metalloproteinases; animal toxins; thrombolysis; antithrombotics

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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).

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Sanchez, E.F.; Flores-Ortiz, R.J.; Alvarenga, V.G.; Eble, J.A. Direct Fibrinolytic Snake Venom Metalloproteinases Affecting Hemostasis: Structural, Biochemical Features and Therapeutic Potential. Toxins 2017, 9, 392.

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