RRC ID 33573
著者 Hirooka K, Edahiro T, Kimura K, Fujita Y.
タイトル Direct and indirect regulation of the ycnKJI operon involved in copper uptake through two transcriptional repressors, YcnK and CsoR, in Bacillus subtilis.
ジャーナル J Bacteriol
Abstract Northern blot and primer extension analyses revealed that the ycnKJI operon and the ycnL gene of Bacillus subtilis are transcribed from adjacent promoters that are divergently oriented. The ycnK and ycnJ genes encode a DeoR-type transcriptional regulator and a membrane protein involved in copper uptake, respectively. DNA binding experiments showed that the YcnK protein specifically binds to the ycnK-ycnL intergenic region, including a 16-bp direct repeat that is essential for the high binding affinity of YcnK, and that a copper-specific chelator significantly inhibits YcnK's DNA binding. lacZ reporter analysis showed that the ycnK promoter is induced by copper limitation or ycnK disruption. These results are consistent with YcnK functioning as a copper-responsive repressor that derepresses ycnKJI expression under copper limitation. On the other hand, the ycnL promoter was hardly induced by copper limitation, but ycnK disruption resulted in a slight induction of the ycnL promoter, suggesting that YcnK also represses ycnL weakly. Moreover, while the CsoR protein did not bind to the ycnK-ycnL intergenic region, lacZ reporter analysis demonstrated that csoR disruption induces the ycnK promoter only in the presence of intact ycnK and copZA genes. Since the copZA operon is involved in copper export and repressed by CsoR, it appears that the constitutive copZA expression brought by csoR disruption causes intracellular copper depletion, which releases the repression of the ycnKJI operon by YcnK.
巻・号 194(20)
ページ 5675-87
公開日 2012-10-1
DOI 10.1128/JB.00919-12
PII JB.00919-12
PMID 22904286
PMC PMC3458678
MeSH Artificial Gene Fusion Bacillus subtilis / genetics* Bacillus subtilis / metabolism* Base Sequence Blotting, Northern Copper / metabolism* DNA, Bacterial / metabolism Gene Deletion Gene Expression Profiling Gene Expression Regulation, Bacterial* Genes, Reporter Models, Biological Molecular Sequence Data Operon Promoter Regions, Genetic Protein Binding Repressor Proteins / metabolism* Transcription Factors / metabolism* Transcription, Genetic* beta-Galactosidase / analysis beta-Galactosidase / genetics
IF 3.006
引用数 9
WOS 分野 MICROBIOLOGY
リソース情報
原核生物(枯草菌) MBS356 MBS357 MBS358 MBS359 MBS360 MBS361 MBS362 MBS363 MBS364 MBS365 MBS366 MBS367 MBS368 MBS369 MBS370