title: Plasmid-encoded diacetyl (acetoin) reductase in Leuconostoc pseudomesenteroides.
abstract: A plasmid-borne diacetyl (acetoin) reductase (butA) from Leuconostoc pseudomesenteroides CHCC2114 was sequenced and cloned. Nucleotide sequence analysis revealed an open reading frame encoding a protein of 257 amino acids which had high identity at the amino acid level to diacetyl (acetoin) reductases reported previously. Downstream of the butA gene of L. pseudomesenteroides, but coding in the opposite orientation, a putative DNA recombinase was identified. A two-step PCR approach was used to construct FPR02, a butA mutant of the wild-type strain, CHCC2114. FPR02 had significantly reduced diacetyl (acetoin) reductase activity with NADH as coenzyme, but not with NADPH as coenzyme, suggesting the presence of another diacetyl (acetoin)-reducing activity in L. pseudomesenteroides. Plasmid-curing experiments demonstrated that the butA gene is carried on a 20-kb plasmid in L. pseudomesenteroides.
authors.affiliation: Department of Genomics and Strain Development, Chr. Hansen A/S., DK-2970 Hørsholm, Denmark. FergalPatrick.Rattray@dk.chr-hansen.com
authors.forename: Fergal P
authors.initials: FP
authors.lastname: Rattray
authors.forename: Dorte
authors.initials: D
authors.lastname: Myling-Petersen
authors.forename: Dianna
authors.initials: D
authors.lastname: Larsen
authors.forename: Dan
authors.initials: D
authors.lastname: Nilsson
mesh_terms: D000094:Acetoin Dehydrogenase / Q000235:genetics* / Q000378:metabolism*; D003001:Cloning, Molecular; D004926:Escherichia coli / Q000201:enzymology / Q000235:genetics; D017353:Gene Deletion; D007934:Leuconostoc / Q000201:enzymology* / Q000235:genetics; D008969:Molecular Sequence Data; D010957:Plasmids / Q000235:genetics*; D017422:Sequence Analysis, DNA
chemical_list: D000094:Acetoin Dehydrogenase