title: Cloning and nucleotide sequence of a D,L-haloalkanoic acid dehalogenase encoding gene from Alcaligenes xylosoxidans ssp. denitrificans ABIV.
abstract: We have cloned DNA fragments of plasmid pFL40 from Alcaligenes xylosoxidans ssp. denitrificans ABIV encoding a D,L-2-haloalkanoic acid halidohydrolase (DhlIV). A 6.5-kb EcoRI/SalI-fragment with inducible expression of the halidohydrolase was cloned in Pseudomonas fluorescens and Escherichia coli. A 1.9-kb HindII-fragment demonstrated expression of the dehalogenase only due to the presence of the promoter from the pUC vector in Escherichia coli. The nucleotide sequence of this DNA-fragment was determined. It had an open reading frame coding for 296 amino acid residues (molecular weight of 32783 D). The dhlIV gene showed sequence homology to a short segment of a D-specific dehalogenase (hadD) from Pseudomonas putida AJ1, but not to any other known DNA sequences. Restriction enzyme patterns indicated similarity between dhlIV and the D,L- isomer specific dehl dehalogenase gene from Pseudomonas putida PP3. There are some indications from restriction enzyme patterns and initial sequencing data, that a gene encoding a sigma 54-dependent activator protein, similar to the dehRI regulatory gene from Pseudomonas putida PP3 is located upstream of dhlIV. In contrast to DehI, dehalogenation of D- or L-chloropropionic acid by the DhlIV-protein leads to lactic acid of inverted configuration.
authors.affiliation: Department of Microbiology, University Gesamthochschule Kassel, Germany.
authors.forename: A
authors.initials: A
authors.lastname: Brokamp
authors.forename: B
authors.initials: B
authors.lastname: Happe
authors.forename: F R
authors.initials: FR
authors.lastname: Schmidt
mesh_terms: D000421:Alcaligenes / Q000201:enzymology / Q000235:genetics*; D000595:Amino Acid Sequence; D001482:Base Composition; D001483:Base Sequence; D003001:Cloning, Molecular; D004791:Enzyme Inhibitors / Q000494:pharmacology; D004926:Escherichia coli / Q000235:genetics; D015964:Gene Expression Regulation, Bacterial; D005798:Genes, Bacterial; D005809:Genes, Regulator; D006867:Hydrolases / Q000737:chemistry / Q000235:genetics* / Q000378:metabolism; D007700:Kinetics; D008969:Molecular Sequence Data; D008970:Molecular Weight; D010957:Plasmids; D011551:Pseudomonas fluorescens / Q000235:genetics; D015183:Restriction Mapping; D012689:Sequence Homology, Nucleic Acid; D013237:Stereoisomerism; D013439:Sulfhydryl Reagents / Q000494:pharmacology
chemical_list: D004791:Enzyme Inhibitors; D013439:Sulfhydryl Reagents; D006867:Hydrolases; C034507:2-haloacid dehalogenase