title: Sequence and characterization of mxaB, a response regulator involved in regulation of methanol oxidation, and of mxaW, a methanol-regulated gene in Methylobacterium extorquens AM1.
abstract: In the facultative serine cycle methylotroph Methylobacterium extorquens AM1, mxaB is required for regulation of methanol oxidation and is located at the end of a large cluster of methylotrophy genes that begins with mxaF. The sequence of mxaB has been obtained and indicates that the gene product is a member of the response regulator family. None of the open reading frames near mxaB showed sequence identity to sensor kinases. Complementation studies suggest a promoter may be located adjacent to mxaB. Another gene (mxaW) is present immediately upstream of mxaF, divergently transcribed from a methanol-inducible promoter. The sequence in the region of mxaW was also obtained. MxaW showed no identity to known proteins. Mutations in mxaW and in an adjacent open reading frame, OrfR, had no effect on growth of M. extorquens AM1 on methanol or other substrates. The MxaW mutant had normal methanol dehydrogenase activity and normal transcription of the mxaF promoter. Therefore, the function of mxaW is unknown.
authors.affiliation: Department of Chemical Engineering, University of Washington, Seattle 98195-1750, USA.
authors.forename: A L
authors.initials: AL
authors.lastname: Springer
authors.forename: A J
authors.initials: AJ
authors.lastname: Auman
authors.forename: M E
authors.initials: ME
authors.lastname: Lidstrom
mesh_terms: D000429:Alcohol Oxidoreductases / Q000235:genetics*; D001426:Bacterial Proteins / Q000235:genetics*; D004269:DNA, Bacterial / Q000032:analysis; D015964:Gene Expression Regulation, Bacterial / Q000235:genetics; D016946:Gram-Negative Aerobic Rods and Cocci / Q000235:genetics* / Q000378:metabolism*; D000432:Methanol / Q000378:metabolism*; D008969:Molecular Sequence Data; D016254:Mutagenesis, Insertional; D016366:Open Reading Frames; D010084:Oxidation-Reduction; D017422:Sequence Analysis, DNA
chemical_list: D001426:Bacterial Proteins; D004269:DNA, Bacterial; C110976:MxaB protein, Methylobacterium extorquens; C110977:mxaW protein, Methylobacterium extorquens; D000429:Alcohol Oxidoreductases; C019641:alcohol dehydrogenase (acceptor); D000432:Methanol