title: Crystallization and preliminary x-ray diffraction studies of a Bowman-Birk inhibitor from Vigna unguiculata seeds.
abstract: A Bowman-Birk type trypsin/chymotrypsin inhibitor isolated from Vigna unguiculata seeds has been crystallized. Crystals were grown using the vapour-diffusion method at pH 4.0 using citrate/phosphate as a buffer and 30% saturated ammonium sulfate as precipitant. The crystals belonged to the monoclinic space group P2(1), with unit-cell parameters a = 32.4, b = 61.8, c = 32.9 A, beta = 114.5 degrees. The Matthews coefficient calculated assuming two molecules in the asymmetric unit was 1.95 A(3) Da(-1), which corresponds to a 37% solvent content. X-ray data were collected to 2.5 A resolution from a flash-frozen crystal. The structure was solved using the molecular-replacement method using tracy soybean inhibitor structure (PDB entry 1pi2) as a model.
authors.affiliation: Division of Biochemical Sciences, National Chemical Laboratory, Pune 411008, India.
authors.forename: K N
authors.initials: KN
authors.lastname: Rao
authors.forename: S S
authors.initials: SS
authors.lastname: Hegde
authors.forename: R J
authors.initials: RJ
authors.lastname: Lewis
authors.forename: C G
authors.initials: CG
authors.lastname: Suresh
mesh_terms: D002918:Chymotrypsin / Q000037:antagonists & inhibitors; D003460:Crystallization; D018360:Crystallography, X-Ray; D007887:Fabaceae; D008958:Models, Molecular; D010946:Plants, Medicinal; D012639:Seeds; D014358:Trypsin Inhibitor, Bowman-Birk Soybean / Q000737:chemistry*; D014361:Trypsin Inhibitors / Q000737:chemistry*
chemical_list: D014358:Trypsin Inhibitor, Bowman-Birk Soybean; D014361:Trypsin Inhibitors; D002918:Chymotrypsin