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Purification, crystallization and preliminary X-ray diffraction analysis of saxthrombin, a thrombin-like enzyme from Gloydius saxatilis venom.


ABSTRACT: The snake-venom thrombin-like enzymes (SVTLEs) are a class of serine proteinases that show fibrinogen-clotting and esterolytic activities. Most TLEs convert fibrinogen to fibrin by releasing either fibrinopeptide A or fibrinopeptide B and cannot activate factor XIII. The enzymes hydrolyze fibrinogen to produce non-cross-linked fibrins, which are susceptible to the lytic action of plasmin. Because of these physiological properties, TLEs have important medical applications in myocardial infarction, ischaemic stroke and thrombotic diseases. Here, a three-step chromatography procedure was used to purify saxthrombin (AAP20638) from Gloydius saxatilis venom to homogeneity. Its molecular weight is about 30 kDa as estimated by SDS-PAGE. A saxthrombin crystal was obtained using the hanging-drop vapour-diffusion method and diffracted to a resolution limit of 1.43 A. The crystal belongs to space group C2, with unit-cell parameters a = 97.23, b = 52.21, c = 50.10 A, beta = 96.72 degrees , and the Matthews coefficient (V(M)) was calculated to be 2.13 A(3) Da(-1) with one molecule in the asymmetric unit.

SUBMITTER: Wei W 

PROVIDER: S-EPMC2335164 | biostudies-literature | 2007 Aug

REPOSITORIES: biostudies-literature

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Purification, crystallization and preliminary X-ray diffraction analysis of saxthrombin, a thrombin-like enzyme from Gloydius saxatilis venom.

Wei Wenqing W   Zhao Wei W   Wang Xiaoping X   Teng Maikun M   Niu Liwen L  

Acta crystallographica. Section F, Structural biology and crystallization communications 20070728 Pt 8


The snake-venom thrombin-like enzymes (SVTLEs) are a class of serine proteinases that show fibrinogen-clotting and esterolytic activities. Most TLEs convert fibrinogen to fibrin by releasing either fibrinopeptide A or fibrinopeptide B and cannot activate factor XIII. The enzymes hydrolyze fibrinogen to produce non-cross-linked fibrins, which are susceptible to the lytic action of plasmin. Because of these physiological properties, TLEs have important medical applications in myocardial infarction  ...[more]

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