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Appl. Environ. Microbiol., Aug 1997, 3282-3285, Vol 63, No. 8
S Kosono, M Maeda, F Fuji, H Arai and T Kudo
Rhodococcus erythropolis TA421, a polychlorinated biphenyl and biphenyl
degrader isolated from a termite ecosystem, has seven bphC genes expressing
2,3-dihydroxybiphenyl dioxygenase activity. R. erythropolis TA421 harbored
a large and probably linear plasmid on which three (bphC2, bphC3, and
bphC4) of the seven bphC genes were located. A non- biphenyl-degrading
mutant, designated strain TA422, was obtained spontaneously from R.
erythropolis TA421. TA422 lacked the plasmid, suggesting that the three
bphC genes were involved in the degradation of biphenyl. Southern blot
analyses showed that R. erythropolis TA421 and Rhodococcus globerulus P6
have a similar set of bphC genes and that the genes for biphenyl catabolism
are located on plasmids of different sizes. These results indicated that
the genes encoding the biphenyl catabolic pathway in Rhodococcus strains
are borne on plasmids.
Copyright © 1997, American Society for Microbiology
Three of the seven bphC genes of Rhodococcus erythropolis TA421, isolated from a termite ecosystem, are located on an indigenous plasmid associated with biphenyl degradation
Institute of Physical and Chemical Research (RIKEN), Saitama, Japan.
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