title: Isolation and sequencing of a gene coding for glyoxalase I activity from Salmonella typhimurium and comparison with other glyoxalase I sequences.
abstract: The glyoxalase I gene (gloA) from Salmonella typhimurium has been isolated in Escherichia coli on a multi-copy pBR322-derived plasmid, selecting for resistance to 3 mM methylglyoxal on Luria-Bertani agar. The region of the plasmid which confers the methylglyoxal resistance in E. coli was sequenced. The deduced protein sequence was compared to the known sequences of the Homo sapiens and Pseudomonas putida glyoxalase I (GlxI) enzymes, and regions of strong homology were used to probe the National Center for Biotechnology Information protein database. This search identified several previously known glyoxalase I sequences and other open reading frames with unassigned function. The clustal alignments of the sequences are presented, indicating possible Zn2+ ligands and active site regions. In addition, the S. typhimurium sequence aligns with both the N-terminal half and the C-terminal half of the proposed GlxI sequences from Saccharomyces cerevisiae and Schizosaccharomyces pombe, suggesting that the structures of the yeast enzymes are those of fused dimers.
authors.affiliation: Department of Chemistry, University of Waterloo, Ont., Canada.
authors.forename: S L
authors.initials: SL
authors.lastname: Clugston
authors.forename: E
authors.initials: E
authors.lastname: Daub
authors.forename: R
authors.initials: R
authors.lastname: Kinach
authors.forename: D
authors.initials: D
authors.lastname: Miedema
authors.forename: J F
authors.initials: JF
authors.lastname: Barnard
authors.forename: J F
authors.initials: JF
authors.lastname: Honek
mesh_terms: D000595:Amino Acid Sequence; D001483:Base Sequence; D003001:Cloning, Molecular; D006801:Humans; D007791:Lactoylglutathione Lyase / Q000235:genetics* / Q000302:isolation & purification / Q000378:metabolism*; D008969:Molecular Sequence Data; D011549:Pseudomonas / Q000201:enzymology; D012486:Salmonella typhimurium / Q000201:enzymology* / Q000235:genetics; D016415:Sequence Alignment; D017386:Sequence Homology, Amino Acid; D015032:Zinc / Q000378:metabolism
chemical_list: D007791:Lactoylglutathione Lyase; D015032:Zinc