title: Crystal structure of toxin II from the scorpion Androctonus australis Hector refined at 1.3 A resolution.
abstract: The crystal structure of toxin II from the scorpion Androctonus australis Hector has been refined at 1.3 A resolution using restrained least-squares methods. The final R-factor is 0.148 for the 13,619 reflections between 7.0 A and 1.3 A resolution with F > 2.5 sigma (F) and the bond length standard deviation from ideality is 0.017 A. Although minor changes have been introduced relative to the model previously refined at 1.8 A resolution, the use of higher-resolution data has allowed the modelling of some discrete disorder. Thus, three residues (including a disulphide bridge) have been built with multiple conformations. Occupancies were refined for the 106 solvent molecules included in the model, nine of them with explicit multiple sites. There is well-defined electron density for some of the protein hydrogen atoms in the final difference Fourier map. A detailed description of the toxin structure is presented, along with a comparison with the high-resolution structure of the related variant-3 scorpion toxin.
authors.affiliation: Laboratoire de Cristallographie et Cristallogenèse des Protéines Institut de Biologie Structurale, Grenoble, France.
authors.forename: D
authors.initials: D
authors.lastname: Housset
authors.forename: C
authors.initials: C
authors.lastname: Habersetzer-Rochat
authors.forename: J P
authors.initials: JP
authors.lastname: Astier
authors.forename: J C
authors.initials: JC
authors.lastname: Fontecilla-Camps
mesh_terms: D000595:Amino Acid Sequence; D001665:Binding Sites; D018360:Crystallography, X-Ray; D006860:Hydrogen Bonding; D008958:Models, Molecular; D008969:Molecular Sequence Data; D009498:Neurotoxins / Q000737:chemistry*; D011487:Protein Conformation; D030162:Reptilian Proteins; D012604:Scorpion Venoms / Q000737:chemistry*
chemical_list: D009498:Neurotoxins; D030162:Reptilian Proteins; D012604:Scorpion Venoms; C053969:scorpion toxin II, Androctonus