title: Crystallization of 5-aminolaevulinic acid dehydratase from Escherichia coli and Saccharomyces cerevisiae and preliminary X-ray characterization of the crystals.
abstract: 5-Aminolaevulinic acid dehydratase (ALAD) catalyzes the formation of porphobilinogen from two molecules of 5-aminolaevulinic acid. Both Escherichia coli and Saccharomyces cerevisiae ALADs are homo-octameric enzymes which depend on Zn2+ for catalytic activity and are potently inhibited by lead ions. The E. coli enzyme crystallized in space group I422 (unit cell dimensions a = b = 130.7 A, c = 142.4 A). The best crystals were obtained in the presence of the covalently bound inhibitor laevulinic acid. The yeast enzyme (expressed in E. coli) crystallized in the same space group (I422) but with a smaller unit cell volume (a = b = 103.7 A, c = 167.7 A). High resolution synchrotron data sets were obtained from both E. coli and yeast ALAD crystals by cryocooling to 100 K.
authors.affiliation: Department of Biochemistry and Molecular Biology, School of Biological Sciences, University of Southampton, United Kingdom.
authors.forename: P T
authors.initials: PT
authors.lastname: Erskine
authors.forename: N
authors.initials: N
authors.lastname: Senior
authors.forename: S
authors.initials: S
authors.lastname: Maignan
authors.forename: J
authors.initials: J
authors.lastname: Cooper
authors.forename: R
authors.initials: R
authors.lastname: Lambert
authors.forename: G
authors.initials: G
authors.lastname: Lewis
authors.forename: P
authors.initials: P
authors.lastname: Spencer
authors.forename: S
authors.initials: S
authors.lastname: Awan
authors.forename: M
authors.initials: M
authors.lastname: Warren
authors.forename: I J
authors.initials: IJ
authors.lastname: Tickle
authors.forename: P
authors.initials: P
authors.lastname: Thomas
authors.forename: S P
authors.initials: SP
authors.lastname: Wood
authors.forename: P M
authors.initials: PM
authors.lastname: Shoolingin-Jordan
mesh_terms: D018360:Crystallography, X-Ray; D004926:Escherichia coli / Q000201:enzymology*; D000623:Porphobilinogen Synthase / Q000737:chemistry*; D012441:Saccharomyces cerevisiae / Q000201:enzymology*; D013045:Species Specificity
chemical_list: D000623:Porphobilinogen Synthase