title: Cloning and nucleotide sequences of carbazole degradation genes from marine bacterium Neptuniibacter sp. strain CAR-SF.
abstract: The marine bacterium Neptuniibacter sp. strain CAR-SF utilizes carbazole as its sole carbon and nitrogen sources. Two sets of clustered genes related to carbazole degradation, the upper and lower pathways, were obtained. The marine bacterium genes responsible for the upper carbazole degradation pathway, carAa, carBa, carBb, and carC, encode the terminal oxygenase component of carbazole 1,9a-dioxygenase, the small and large subunits of the meta-cleavage enzyme, and the meta-cleavage compound hydrolase, respectively. The genes involved in the lower degradation pathway encode the anthranilate dioxygenase large and small subunit AntA and AntB, anthranilate dioxygenase reductase AntC, 4-oxalocrotonate tautomerase, and catechol 2,3-dioxygenase. Reverse transcription-polymerase chain reaction confirmed the involvement of the isolated genes in carbazole degradation. Escherichia coli cells transformed with the CarAa of strain CAR-SF required ferredoxin and ferredoxin reductase for biotransformation of carbazole. Although carAc, which encodes the ferredoxin component of carbazole 1,9a-dioxygenase, was not found immediately downstream of carAaBaBbC, the carAc-like gene may be located elsewhere based on Southern hybridization. This is the first report of genes involved in carbazole degradation isolated from a marine bacterium.
authors.affiliation: Bioscience and Bioengineering Department, Shibaura Institute of Technology, 307 Fukasaku, Minuma-ku, Saitama-shi, 337-8570, Japan.
authors.forename: Hiroshi
authors.initials: H
authors.lastname: Nagashima
authors.forename: Azham Bin
authors.initials: AB
authors.lastname: Zulkharnain
authors.forename: Rintaro
authors.initials: R
authors.lastname: Maeda
authors.forename: Hiroyuki
authors.initials: H
authors.lastname: Fuse
authors.forename: Kenichi
authors.initials: K
authors.lastname: Iwata
authors.forename: Toshio
authors.initials: T
authors.lastname: Omori
mesh_terms: D001426:Bacterial Proteins / Q000235:genetics / Q000378:metabolism; D001483:Base Sequence; D001711:Biotransformation; D002227:Carbazoles / Q000378:metabolism*; D050557:Catechol 2,3-Dioxygenase / Q000235:genetics / Q000378:metabolism; D049308:Dioxygenases / Q000235:genetics / Q000378:metabolism; D004926:Escherichia coli / Q000235:genetics / Q000378:metabolism; D005288:Ferredoxins / Q000235:genetics / Q000378:metabolism; D005798:Genes, Bacterial; D006867:Hydrolases / Q000235:genetics / Q000378:metabolism; D007535:Isomerases / Q000235:genetics / Q000378:metabolism; D053858:Metabolic Networks and Pathways / Q000235:genetics; D006899:Mixed Function Oxygenases / Q000235:genetics / Q000378:metabolism; D005810:Multigene Family; D044130:Oceanospirillaceae / Q000201:enzymology / Q000235:genetics* / Q000378:metabolism*; D016366:Open Reading Frames; D020133:Reverse Transcriptase Polymerase Chain Reaction; D014158:Transcription, Genetic; D014169:Transformation, Bacterial
chemical_list: D001426:Bacterial Proteins; D002227:Carbazoles; D005288:Ferredoxins; C041514:carbazole; D006899:Mixed Function Oxygenases; D049308:Dioxygenases; C108434:carbazole 1,9a-dioxygenase; D050557:Catechol 2,3-Dioxygenase; C023440:anthranilate 2,3-dioxygenase(deaminating); D006867:Hydrolases; C021918:4-oxalocrotonate tautomerase; D007535:Isomerases