title: Crystallization and preliminary X-ray crystallographic analysis of a highly stable mutant V107A of glutathione transferase from Anopheles dirus in complex with glutathione.
abstract: An engineered mutant V107A of the dimeric glutathione transferase enzyme from Anopheles dirus (adgstD4-4) was cocrystallized with glutathione substrate using the hanging-drop vapour-diffusion method. The crystal diffracted to 2.47 A resolution in space group P3(2)21 (unit-cell parameters a = b = 49.4, c = 272.4 A). Although the crystal morphology differed from that previously obtained for the wild-type enzyme, the crystal packing was the same. At 318 K, the engineered mutant showed an enzyme stability that was increased by about 32-fold, while possessing a similar catalytic function to the wild type. Structural determination will provide valuable understanding of the role of Val107. This residue is in the dimeric interface and appears to contribute towards enhancing the physical properties of the entire protein.
authors.affiliation: Institute of Molecular Biology and Genetics, Mahidol University, Salaya Campus, Nakorn Pathom 73170, Thailand.
authors.forename: Jantana
authors.initials: J
authors.lastname: Wongsantichon
authors.forename: Jirundon
authors.initials: J
authors.lastname: Yuvaniyama
authors.forename: Albert J
authors.initials: AJ
authors.lastname: Ketterman
mesh_terms: D000595:Amino Acid Sequence; D000818:Animals; D000852:Anopheles / Q000201:enzymology*; D003460:Crystallization / Q000379:methods; D018360:Crystallography, X-Ray; D004795:Enzyme Stability; D004926:Escherichia coli / Q000378:metabolism; D005978:Glutathione / Q000737:chemistry*; D005982:Glutathione Transferase / Q000737:chemistry* / Q000235:genetics*; D017354:Point Mutation; D014633:Valine / Q000737:chemistry
chemical_list: D005982:Glutathione Transferase; D005978:Glutathione; D014633:Valine