title: Characterization of the genes of the 2,3-butanediol operons from Klebsiella terrigena and Enterobacter aerogenes.
abstract: The genes involved in the 2,3-butanediol pathway coding for alpha-acetolactate decarboxylase, alpha-acetolactate synthase (alpha-ALS), and acetoin (diacetyl) reductase were isolated from Klebsiella terrigena and shown to be located in one operon. This operon was also shown to exist in Enterobacter aerogenes. The budA gene, coding for alpha-acetolactate decarboxylase, gives in both organisms a protein of 259 amino acids. The amino acid similarity between these proteins is 87%. The K. terrigena genes budB and budC, coding for alpha-ALS and acetoin reductase, respectively, were sequenced. The 559-amino-acid-long alpha-ALS enzyme shows similarities to the large subunits of the Escherichia coli anabolic alpha-ALS enzymes encoded by the genes ilvB, ilvG, and ilvI. The K. terrigena alpha-ALS is also shown to complement an anabolic alpha-ALS-deficient E. coli strain for valine synthesis. The 243-amino-acid-long acetoin reductase has the consensus amino acid sequence for the insect-type alcohol dehydrogenase/ribitol dehydrogenase family and has extensive similarities with the N-terminal and internal regions of three known dehydrogenases and one oxidoreductase.
authors.affiliation: Biotechnical Laboratory, Technical Research Center of Finland, Espoo.
authors.forename: K
authors.initials: K
authors.lastname: Blomqvist
authors.forename: M
authors.initials: M
authors.lastname: Nikkola
authors.forename: P
authors.initials: P
authors.lastname: Lehtovaara
authors.forename: M L
authors.initials: ML
authors.lastname: Suihko
authors.forename: U
authors.initials: U
authors.lastname: Airaksinen
authors.forename: K B
authors.initials: KB
authors.lastname: Stråby
authors.forename: J K
authors.initials: JK
authors.lastname: Knowles
authors.forename: M E
authors.initials: ME
authors.lastname: Penttilä
mesh_terms: D000095:Acetolactate Synthase / Q000235:genetics* / Q000378:metabolism; D000429:Alcohol Oxidoreductases / Q000235:genetics*; D000595:Amino Acid Sequence; D001483:Base Sequence; D002072:Butylene Glycols / Q000378:metabolism*; D002262:Carboxy-Lyases / Q000235:genetics* / Q000378:metabolism; D003001:Cloning, Molecular; D004269:DNA, Bacterial; D004754:Enterobacter / Q000235:genetics*; D015964:Gene Expression Regulation, Bacterial; D005798:Genes, Bacterial; D007709:Klebsiella / Q000235:genetics*; D008969:Molecular Sequence Data; D009876:Operon; D015183:Restriction Mapping; D017386:Sequence Homology, Amino Acid; D012689:Sequence Homology, Nucleic Acid; D014158:Transcription, Genetic
chemical_list: D002072:Butylene Glycols; D004269:DNA, Bacterial; C026978:2,3-butylene glycol; D000429:Alcohol Oxidoreductases; C019801:butanediol dehydrogenase; D000095:Acetolactate Synthase; D002262:Carboxy-Lyases; C023746:acetolactate decarboxylase