Current Microbiology

, Volume 61, Issue 1, pp 50–56 | Cite as

Cloning and Nucleotide Sequences of Carbazole Degradation Genes from Marine Bacterium Neptuniibacter sp. Strain CAR-SF

  • Hiroshi Nagashima
  • Azham Bin Zulkharnain
  • Rintaro Maeda
  • Hiroyuki Fuse
  • Kenichi Iwata
  • Toshio OmoriEmail author


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.


Carbazole Anthranilate Strain CA10 Ferredoxin Reductase carAc 
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This study was supported by Grant-in-Aid for Scientific Research (17380056 to T.O.) from the Ministry of Education, Culture, Sports, Science and Technology of Japan.


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Copyright information

© Springer Science+Business Media, LLC 2009

Authors and Affiliations

  • Hiroshi Nagashima
    • 1
  • Azham Bin Zulkharnain
    • 1
  • Rintaro Maeda
    • 1
  • Hiroyuki Fuse
    • 1
    • 2
  • Kenichi Iwata
    • 1
  • Toshio Omori
    • 1
    Email author
  1. 1.Bioscience and Bioengineering DepartmentShibaura Institute of TechnologyMinuma-kuJapan
  2. 2.National Institute of Advanced Industrial Science and TechnologyTsukubaJapan

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