Characterization, crystallization and preliminary X--ray diffraction analysis of acutohaemolysin, a haemolytic toxin from Agkistrodon acutus venom.

Abstract

Acutohaemolysin, a phospholipase A(2) (PLA(2)) from the venom of the snake Agkistrodon acutus, has been isolated and purified to homogeneity by anion-exchange chromatography on a DEAE-Sepharose column followed by cation-exchange chromatography on a CM-Sepharose column. It is an alkaline protein with an isoelectric point of 10.5 and is comprised of a single polypeptide chain of 13 938 Da. Its N-terminal amino-acid sequence shows very high similarity to Lys49-type PLA(2) proteins from other snake venoms. Although its PLA(2) enzymatic activity is very low, acutohaemolysin has a strong indirect haemolytic activity and anticoagulant activity. Acutohaemolysin crystals with a diffraction limit of 1.60 A were obtained by the hanging-drop vapour-diffusion method. The crystals belong to the space group C2, with unit-cell parameters a = 45.30, b = 59.55, c = 46.13 A, beta = 117.69 degrees. The asymmetric unit contains one molecule.

Cite this paper

@article{Huang2000CharacterizationCA, title={Characterization, crystallization and preliminary X--ray diffraction analysis of acutohaemolysin, a haemolytic toxin from Agkistrodon acutus venom.}, author={Qiao Q. Huang and Xi Yu Zhu and Nian Bing Li and W. H. Deng and Timothy B. Chen and Ping Fan Rao and Ming-xing Teng and Li-li Niu}, journal={Acta crystallographica. Section D, Biological crystallography}, year={2000}, volume={56 Pt 7}, pages={907-11} }