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Volume 271, Number 41,
Issue of October 11, 1996
pp. 25423-25429
©1996 by The American Society for Biochemistry and Molecular Biology, Inc.
Identification of the cpdA Gene Encoding Cyclic
3 ,5 -Adenosine Monophosphate Phosphodiesterase in Escherichia
coli
(Received for publication, November 13, 1995, and in revised form, June 21, 1996)
Ryu
Imamura
,
Kunitoshi
Yamanaka
,
Teru
Ogura
,
Sota
Hiraga
,
Nobuyuki
Fujita
§
,
Akira
Ishihama
§
and
Hironori
Niki
From the Department of Molecular Cell Biology,
Institute of Molecular Embryology and Genetics, Kumamoto University
School of Medicine, Kumamoto, Kumamoto 862 and the
§ Department of Molecular Genetics, National Institute of
Genetics, Mishima, Shizuoka 411, Japan
We have identified a gene, cpdA,
located at 66.2 min of the chromosome of Escherichia coli
that encodes cyclic 3 ,5 -adenosine monophosphate
phosphodiesterase (cAMP phosphodiesterase, EC). The
expression of -galactosidase, which is a product of the
lacZ gene, was repressed in cells that harbored multiple
copies of the plasmid carrying the cpdA gene. Northern
blotting showed that the transcription of the lacZ gene was
inhibited in these cells. Multiple copies of the cpdA gene
decreased the intracellular concentration of cAMP, which is a positive
regulator for transcription of the lacZ gene. We found that
the purified CpdA protein repressed in vitro transcription
from the lacP1 promoter by decreasing cAMP. In addition, we
showed that the CpdA protein hydrolyzed cAMP to 5 -adenosine
monophosphate and that its activity was activated by iron. Our results
suggested that regulation of intracellular concentration of cAMP is
dependent not only on synthesis of cAMP but also on hydrolysis of cAMP
by cAMP phosphodiesterase.

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Copyright © 1996 by the American Society for Biochemistry and Molecular Biology.
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