Open AccessCrystallization and preliminary X‐ray crystallographic analysis of agkicetin‐C from Deinagkistrodon acutus venom
Author(s) -
Xu Gufeng,
Huang Qingqiu,
Teng Maikun,
Liu Peng,
Dong Yuhui,
Niu Liwen
Publication year - 2005
Publication title -
acta crystallographica section f
Language(s) - English
Resource type - Journals
ISSN - 1744-3091
DOI - 10.1107/s1744309104027241
Subject(s) - crystallization , crystallography , venom , ammonium sulfate , crystal structure , chemistry , molecule , space group , x ray crystallography , materials science , stereochemistry , diffraction , physics , organic chemistry , biochemistry , optics
The crystallization and preliminary crystallographic analysis of agkicetin‐C, a well known platelet glycoprotein Ib (GPIb) antagonist from the venom of Deinagkistrodon acutus found in Anhui Province, China is reported. Crystals of agkicetin‐C suitable for structure determination were obtained from 1.8 M ammonium sulfate, 40 m M MES pH 6.5 with 2%( v / v ) PEG 400. Interestingly, low buffer concentrations of MES seem to be necessary for crystal growth. The crystals of agkicetin‐C belong to space group C 2, with unit‐cell parameters a = 177.5, b = 97.7, c = 106.8 Å, β = 118.5°, and diffract to 2.4 Å resolution. Solution of the phase problem by the molecular‐replacement method shows that there are four agkicetin‐C molecules in the asymmetric unit, with a V M value of 3.4 Å 3 Da −1 , which corresponds to a high solvent content of approximately 64%. Self‐rotation function calculations show a single well defined non‐crystallographic twofold axis with features that may represent additional elements of non‐crystallographic symmetry.