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Originally published In Press as doi:10.1074/jbc.M003023200 on July 18, 2000
J. Biol. Chem., Vol. 275, Issue 40, 31016-31023, October 6, 2000
Versatile Transcription of Biphenyl Catabolic bph
Operon in Pseudomonas pseudoalcaligenes KF707*
Takahito
Watanabe,
Ryuichi
Inoue,
Nobutada
Kimura, and
Kensuke
Furukawa
From the Laboratory of Applied Microbiology, Graduate School of
Bioresource and Bioenvironmental Sciences, Kyushu University, Hakozaki
6-10-1 Fukuoka 812-8581, Japan
Pseudomonas pseudoalcaligenes KF707
possesses a chromosomally encoded bph gene cluster
responsible for the catabolism of biphenyl/polychlorinated biphenyls. The gene cluster consists of
(orf0)bphA1A2(orf3)bphA3A4BCX0X1X2X3D. We
studied the role of orf0 and transcription in the KF707
bph operon. Primer extension analyses revealed that at
least as many as six transcriptional initiation sites exist upstream of
orf0, bphA1, bphX0,
bphX1, and bphD, including two upstream of
bphD. The orf0-disruptant failed to grow on
biphenyl but accumulated large amounts of the biphenyl ring
meta-cleavage yellow compound (2-hydroxy-6-oxo-6-phenylhexa-2,4-dienoate). Western blot analysis revealed that ORF0 protein is inducibly expressed in KF707 in the
presence of biphenyl. Gel shift assay revealed that ORF0 directly binds
to the orf0 operator region. This binding was greatly
enhanced by addition of the biphenyl ring meta-cleavage
yellow compound. These results indicated that orf0,
bphA1A2(orf3)bphA3A4BC and bphX0X1X2X3D
are independently transcribed, and that ORF0 protein belonging to
the GntR family is involved in the regulation of the bph
operon in KF707 and is absolutely required for the expression of
orf0 and bphX0X1X2X3D.
*
This work was supported in part by CREST (Core Research for
Evolutional Science and Technology) of the Japan Science and Technology Corporation.The costs of publication of this
article were defrayed in part by the
payment of page charges. The article
must therefore be hereby marked
"advertisement" in
accordance with 18 U.S.C. Section
1734 solely to indicate this fact.
The nucleotide sequence(s) reported in this paper has been submitted to the GenBankTM/EMBL Data Bank with accession number(s) D85852, M83673, D85853, and D85851.
To whom correspondence should be addressed. Tel. and Fax:
81-92-642-2849; E-mail: kfurukaw@agr.kyushu-u.ac.jp.
Copyright © 2000 by The American Society for Biochemistry and Molecular Biology, Inc.

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Copyright © 2000 by the American Society for Biochemistry and Molecular Biology.
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