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le Du MH, Housset D, Marchot P, et al. Structure of fasciculin 2 from green mamba snake venom: evidence for unusual loop flexibility. Acta Crystallogr D Biol Crystallogr. 1996;52:87-92doi: 10.1107/S0907444995007517.
le Du, M. H., Housset, D., Marchot, P., Bougis, P. E., Navaza, J., & Fontecilla-Camps, J. C. (1996). Structure of fasciculin 2 from green mamba snake venom: evidence for unusual loop flexibility. Acta crystallographica. Section D, Biological crystallography, 5287-92. https://doi.org/10.1107/S0907444995007517
le Du, M H, et al. "Structure of fasciculin 2 from green mamba snake venom: evidence for unusual loop flexibility." Acta crystallographica. Section D, Biological crystallography vol. 52 (1996): 87-92. doi: https://doi.org/10.1107/S0907444995007517
le Du MH, Housset D, Marchot P, Bougis PE, Navaza J, Fontecilla-Camps JC. Structure of fasciculin 2 from green mamba snake venom: evidence for unusual loop flexibility. Acta Crystallogr D Biol Crystallogr. 1996 Jan 01;52:87-92. doi: 10.1107/S0907444995007517. PMID: 15299729.
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Acta Crystallogr D Biol Crystallogr. 1996 Jan 01;52:87-92. doi: 10.1107/S0907444995007517.

Structure of fasciculin 2 from green mamba snake venom: evidence for unusual loop flexibility.

Acta crystallographica. Section D, Biological crystallography

M H le Du, D Housset, P Marchot, P E Bougis, J Navaza, J C Fontecilla-Camps

Affiliations

  1. Laboratoire de Cristallographie et Cristallogenèse des Protéines, Institut de Biologie Structurale J.P. Ebel, CEA-CNRS, Grenoble, France.

PMID: 15299729 DOI: 10.1107/S0907444995007517

Abstract

The crystal structure of the snake toxin fasciculin 2, a potent acetylcholinesterase inhibitor from the venom of the green mamba (Dendroaspis angusticeps), has been determined by the molecular-replacement method, using the fasciculin 1 model and refined to 2.0 A resolution. The introduction of an overall anisotropic temperature factor improved significantly the quality of the electron-density map. It suggests, as it was also indicated by the packing, that the thermal motion along the unique axis direction is less pronounced than on the (ab) plane. The final crystallographic R factor is 0.188 for a model having r.m.s. deviations from ideality of 0.016 A for bond lengths and 2.01 degrees for bond angles. As fasciculin 1, fasciculin 2 belongs to the three-finger class of Elapidae toxins, a structural group that also contains the alpha-neurotoxins and the cardiotoxins. Although the two fasciculins have, overall, closely related structures, the conformation of loop I differs appreciably in the two molecules. The presence of detergent in crystallization medium in the case of fasciculin 2 appears to be responsible for the displacement of the loop containing Thr9. This conformational change also results in the formation of a crystallographic dimer that displays extensive intermolecular interactions.

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