The expression of the Acinetobacter calcoaceticus recA gene increases in response to DNA damage independently of RecA and of development of competence for natural transformation.
Using the lacZ operon fusion technique, the transcriptional control of the Acinetobacter calcoaceticus recA gene was studied. A low (approximately twofold) inductive capacity was observed for compounds that damage DNA and/or inhibit DNA replication, e.g. methyl methanesulfonate, mitomycin C, UV light and nalidixic acid. Induction of the recA gene by DNA damage was independent of functional RecA. The presence of the recA promoter region on a multicopy plasmid had the same effect on recA transcription as the presence of DNA-damaging agents. Thus, recA expression in A. calcoaceticus appears to be regulated in a novel fashion, possibly involving a non-LexA-like repressor. Regulation of the recA gene in A. calcoaceticus appears not to be part of a regulon responsible for competence for natural transformation: in cells exhibiting extremely low transformation frequencies, the level of transcription of the recA gene was found to be comparable to the level found in cells in the state of maximal competence.
Rauch
Peter J G
PJG
Department of Microbiology, E. C. Slater Institute, BioCentrum Amsterdam, Nieuwe Achtergracht 127, 1018 TV Amsterdam, The Netherlands.
Palmen
Ronald
R
Department of Microbiology, E. C. Slater Institute, BioCentrum Amsterdam, Nieuwe Achtergracht 127, 1018 TV Amsterdam, The Netherlands.
Burds
Aurora A
AA
Department of Biology, Grinell College, Grinell, IA 50112, USA.
Gregg-Jolly
Leslie A
LA
Department of Biology, Grinell College, Grinell, IA 50112, USA.
van der Zee
J Rob
JR
Department of Microbiology, E. C. Slater Institute, BioCentrum Amsterdam, Nieuwe Achtergracht 127, 1018 TV Amsterdam, The Netherlands.
Hellingwerf
Klaas J
KJ
Department of Microbiology, E. C. Slater Institute, BioCentrum Amsterdam, Nieuwe Achtergracht 127, 1018 TV Amsterdam, The Netherlands.
D016954:Acinetobacter calcoaceticus / Q000235:genetics*; D003001:Cloning, Molecular; D004249:DNA Damage; D015964:Gene Expression Regulation, Bacterial; D005798:Genes, Bacterial; D007763:Lac Operon; D010957:Plasmids / Q000235:genetics; D011401:Promoter Regions, Genetic; D011938:Rec A Recombinases / Q000235:genetics*; D015183:Restriction Mapping; D014158:Transcription, Genetic; D014170:Transformation, Genetic
D011938:Rec A Recombinases