title: Purification, crystallization and preliminary X-ray analysis of the disintegrin contortrostatin from Agkistrodon contortrix contortrix snake venom.
abstract: Disintegrins are cysteine-rich RGD-containing peptides that block tumor-cell implantation and angiogenesis. Contortrostatin, a homodimeric disintegrin (64 residues in each chain) from southern copperhead snake venom, has been purified to homogeneity and crystallized. Initial attempts at crystallization led to a form grown from polyethylene glycol (PEG), which crystallizes in the orthorhombic space group C222(1), with unit-cell parameters a = 57.39, b = 139.55, c = 78.98 A, and diffracts to a resolution limit of 3.2 A. Very recently, a new crystalline form of the title protein has been obtained grown from ammonium sulfate [(NH(4))(2)SO(4)] as a precipitant having a space group of P2(1)2(1)2(1), with unit-cell parameters a = 37.52, b = 59.93, c = 121.37 A. These improved crystals diffract to a resolution limit of 1.7 A.
authors.affiliation: Department of Chemistry, University of Southern California, Los Angeles, CA 90089, USA.
authors.forename: Natalia
authors.initials: N
authors.lastname: Moiseeva
authors.forename: Stephen D
authors.initials: SD
authors.lastname: Swenson
authors.forename: Francis S
authors.initials: FS
authors.lastname: Markland
authors.forename: Robert
authors.initials: R
authors.lastname: Bau
mesh_terms: D000595:Amino Acid Sequence; D002851:Chromatography, High Pressure Liquid; D003435:Crotalid Venoms / Q000737:chemistry*; D018360:Crystallography, X-Ray; D019483:Disintegrins / Q000737:chemistry / Q000302:isolation & purification*; D008969:Molecular Sequence Data; D011487:Protein Conformation; D017386:Sequence Homology, Amino Acid
chemical_list: C031442:Agkistrodon venoms; D003435:Crotalid Venoms; D019483:Disintegrins; C403494:contortrostatin