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  • Title: Purification, crystallization and preliminary X-ray diffraction analysis of an acidic phospholipase A2 with vasoconstrictor activity from Agkistrodon halys pallas venom.
    Author: Zou Z, Zeng F, Zhang L, Niu L, Teng M, Li X.
    Journal: Acta Crystallogr Sect F Struct Biol Cryst Commun; 2012 Nov 01; 68(Pt 11):1329-32. PubMed ID: 23143242.
    Abstract:
    Phospholipases A2 (PLA2s) are the major component of snake venoms and exert a variety of relevant toxic actions such as neurotoxicity and myotoxicity, amongst others. An acidic PLA2, here named AhV_aPA, was purified from Agkistrodon halys pallas venom by means of a three-step chromatographic procedure. AhV_aPA migrated as a single band on SDS-PAGE gels, with a molecular weight of about 14 kDa. Like other acidic aPLA2s, AhV_aPA has high enzymatic activity. Tension measurements of mouse thoracic aortic rings remarkably indicated that AhV_aPA could induce a further contractile response on the 60 mM K+-induced contraction, with an EC50 of 369 nmol l(-1). Rod-shaped crystals were obtained by the hanging-drop vapour-diffusion method and diffracted to a resolution limit of 2.30 Å. The crystals belonged to space group P222, with unit-cell parameters a=44.27, b=68.39, c=81.54 Å.
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