RRC ID 35366
著者 Ogasawara H, Yamamoto K, Ishihama A.
タイトル Role of the biofilm master regulator CsgD in cross-regulation between biofilm formation and flagellar synthesis.
ジャーナル J Bacteriol
Abstract CsgD, the master regulator of biofilm formation, activates the synthesis of curli fimbriae and extracellular polysaccharides in Escherichia coli. To obtain insights into its regulatory role, we have identified a total of 20 novel regulation target genes on the E. coli genome by using chromatin immunoprecipitation (ChIP)-on-chip analysis with a high-density DNA microarray. By DNase I footprinting, the consensus CsgD-binding sequence predicted from a total of 18 target sites was found to include AAAAGNG(N(2))AAAWW. After a promoter-lacZ fusion assay, the CsgD targets were classified into two groups: group I genes, such as fliE and yhbT, are repressed by CsgD, while group II genes, including yccT and adrA, are activated by CsgD. The fliE and fliEFGH operons for flagellum formation are directly repressed by CsgD, while CsgD activates the adrA gene, which encodes an enzyme for synthesis of cyclic di-GMP, a bacterial second messenger, which in turn inhibits flagellum production and rotation. Taking these findings together, we propose that the cell motility for planktonic growth is repressed by CsgD, thereby promoting the switch to biofilm formation.
巻・号 193(10)
ページ 2587-97
公開日 2011-5-1
DOI 10.1128/JB.01468-10
PII JB.01468-10
PMID 21421764
PMC PMC3133154
MeSH Artificial Gene Fusion Bacterial Proteins / biosynthesis* Binding Sites Biofilms / growth & development* Chromatin Immunoprecipitation Consensus Sequence DNA Footprinting DNA, Bacterial / genetics DNA, Bacterial / metabolism Escherichia coli / genetics Escherichia coli / physiology* Escherichia coli Proteins / metabolism* Flagella / metabolism Gene Expression Regulation, Bacterial* Genes, Reporter Oligonucleotide Array Sequence Analysis / methods Promoter Regions, Genetic Protein Binding Regulon Trans-Activators / metabolism* beta-Galactosidase / genetics beta-Galactosidase / metabolism
IF 3.006
引用数 89
WOS 分野 MICROBIOLOGY
リソース情報
原核生物(大腸菌) ME9062(BW25113) JW1023-KC