title: Initiating a crystallographic analysis of recombinant (S)-2-hydroxypropylphosphonic acid epoxidase from Streptomyces wedmorensis.
abstract: The oxirane (1R,2S)-1,2-epoxypropylphosphonic acid (fosfomycin) is a natural product antibiotic produced in Streptomyces wedmorensis by the metal-ion-dependent (S)-2-hydroxypropylphosphonic acid epoxidase. This epoxidase is highly unusual since it has no requirement for a haem prosthetic group. The gene encoding the enzyme, fom4, has been cloned and a highly efficient recombinant source of the enzyme established. Two different crystal forms, tetragonal and hexagonal, have been obtained. The hexagonal form displays symmetry consistent with space group P6(1/5)22 and unit-cell parameters a = 86.44, c = 221.56 A, gamma = 120 degrees. The Matthews coefficient, VM, of 2.7 A3 Da(-1) corresponds to two subunits, each of approximate weight 21.4 kDa, in the asymmetric unit with 55% solvent content. These crystals diffract to high resolution and experimental phases are being sought to determine the structure.
authors.affiliation: Division of Biological Chemistry and Molecular Microbiology, School of Life Sciences, University of Dundee, Dundee DD1 5EH, Scotland.
authors.forename: Scott
authors.initials: S
authors.lastname: Cameron
authors.forename: Karen
authors.initials: K
authors.lastname: McLuskey
authors.forename: Rachel
authors.initials: R
authors.lastname: Chamberlayne
authors.forename: Irene
authors.initials: I
authors.lastname: Hallyburton
authors.forename: William N
authors.initials: WN
authors.lastname: Hunter
mesh_terms: D001483:Base Sequence; D003001:Cloning, Molecular; D003460:Crystallization; D018360:Crystallography, X-Ray; D008969:Molecular Sequence Data; D010088:Oxidoreductases / Q000737:chemistry* / Q000235:genetics / Q000378:metabolism; D020836:Protein Structure, Quaternary; D011994:Recombinant Proteins / Q000737:chemistry* / Q000235:genetics / Q000378:metabolism*; D013302:Streptomyces / Q000201:enzymology* / Q000378:metabolism
chemical_list: D011994:Recombinant Proteins; D010088:Oxidoreductases; C405402:2-hydroxypropylphosphonic acid epoxidase