Cross-regulation of biphenyl- and salicylate-catabolic genes by two regulatory systems in Pseudomonas pseudoalcaligenes KF707.
Pseudomonas pseudoalcaligenes KF707 grows on biphenyl and salicylate as sole sources of carbon. The biphenyl-catabolic (bph) genes are organized as bphR1A1A2(orf3)A3A4BCX0X1X2X3D, encoding the enzymes for conversion of biphenyl to acetyl coenzyme A. In this study, the salicylate-catabolic (sal) gene cluster encoding the enzymes for conversion of salicylate to acetyl coenzyme A were identified 6.6-kb downstream of the bph gene cluster along with a second regulatory gene, bphR2. Both the bph and sal genes were cross-regulated positively and/or negatively by the two regulatory proteins, BphR1 and BphR2, in the presence or absence of the effectors. The BphR2 binding sequence exhibits homology with the NahR binding sequences in various naphthalene-degrading bacteria. Based on previous studies and the present study we propose a new regulatory model for biphenyl and salicylate catabolism in strain KF707.
Fujihara
Hidehiko
H
Laboratory of Applied Microbiology, Graduate School of Bioresource and Bioenvironmental Sciences, Kyushu University, Hakozaki 6-10-1, Fukuoka 812-8581, Japan.
Yoshida
Hideyuki
H
Matsunaga
Tetsuya
T
Goto
Masatoshi
M
Furukawa
Kensuke
K
D000105:Acetyl Coenzyme A / Q000378:metabolism; D001426:Bacterial Proteins / Q000235:genetics*; D001713:Biphenyl Compounds / Q000378:metabolism; D003470:Culture Media; D015964:Gene Expression Regulation, Bacterial; D005798:Genes, Bacterial; D008969:Molecular Sequence Data; D005810:Multigene Family; D011485:Protein Binding; D044205:Pseudomonas pseudoalcaligenes / Q000235:genetics* / Q000254:growth & development / Q000378:metabolism; D012459:Salicylates / Q000378:metabolism; D024363:Transcription Initiation Site
D000105:Acetyl Coenzyme A; D001426:Bacterial Proteins; D001713:Biphenyl Compounds; D003470:Culture Media; D012459:Salicylates; C010574:biphenyl