title: The plasmid-located haloalkane dehalogenase gene from Rhodococcus rhodochrous NCIMB 13064.
abstract: The haloalkane dehalogenase (dhaA) gene from Rhodococcus rhodochrous NCIMB 13064 was cloned and sequenced. Its comparison with the previously studied dhlA gene from Xanthobacter autotrophicus GJ10 did not show homology. However, the amino acid sequences of the products of these genes showed approximately 30% identity and several of the catalytic amino acid residues were conserved in the NCIMB 13,064 dehalogenase. A high level of dhaA expression was demonstrated in Escherichia coli cells and this gene was shown to encode a dehalogenase with the activity against chloroalkanes of chain length C3-C10. Also, some dehalogenase activity against 1,2-dichloroethane encoded by the cloned dhaA gene was detected. The analysis of NCIMB 13,064 derivatives lacking dehalogenase activity showed that the dhaA gene was located on the 100 kbp pRTL1 plasmid. It was also found that reversible rearrangements of DNA in the dhaA region may be responsible for the control of expression of haloalkane dehalogenase in R. rhodochrous NCIMB 13064. A number of repeated and inverted sequences which may cause genetic instability at the locus were found in the haloalkane dehalogenase gene region.
authors.affiliation: The Questor Centre, David Keir Building, The Queen's University of Belfast, Belfast BT9 5AG, UK and School of Biology and Biochemistry, Medical Biology Centre, The Queen's University of Belfast,Belfast BT9 7BL,UK.
authors.forename: Anna N
authors.initials: AN
authors.lastname: Kulakova
authors.affiliation: The Questor Centre, David Keir Building, The Queen's University of Belfast, Belfast BT9 5AG, UK and School of Biology and Biochemistry, Medical Biology Centre, The Queen's University of Belfast,Belfast BT9 7BL,UK.
authors.forename: Michael J
authors.initials: MJ
authors.lastname: Larkin
authors.affiliation: The Questor Centre, David Keir Building, The Queen's University of Belfast, Belfast BT9 5AG, UK and School of Biology and Biochemistry, Medical Biology Centre, The Queen's University of Belfast,Belfast BT9 7BL,UK.
authors.forename: Leonid A
authors.initials: LA
authors.lastname: Kulakov
mesh_terms: D000595:Amino Acid Sequence; D001483:Base Sequence; D003001:Cloning, Molecular; D017124:Conserved Sequence; D004926:Escherichia coli / Q000235:genetics; D015964:Gene Expression Regulation, Bacterial; D005798:Genes, Bacterial; D006088:Gram-Negative Aerobic Bacteria / Q000201:enzymology / Q000235:genetics; D006867:Hydrolases / Q000096:biosynthesis / Q000235:genetics*; D008969:Molecular Sequence Data; D009154:Mutation; D009693:Nucleic Acid Hybridization; D010957:Plasmids / Q000235:genetics*; D011994:Recombinant Proteins / Q000096:biosynthesis; D012240:Rhodococcus / Q000201:enzymology / Q000235:genetics*; D017422:Sequence Analysis, DNA; D017386:Sequence Homology, Amino Acid; D013045:Species Specificity; D013379:Substrate Specificity
chemical_list: D011994:Recombinant Proteins; D006867:Hydrolases; C046137:haloalkane dehalogenase