Repression of flagella motility in enterohemorrhagic Escherichia coli O157:H7 by mucin components.
Whole genome-scale transcriptome analysis of enterohemorrhagic Escherichia coli (EHEC) O157:H7 EDL933 was performed to investigate the influence of mucin components on the EHEC gene expression. Here we report that the 732 candidate genes were differentially expressed by the presence of 0.5% porcine stomach mucin, including the 8 flagella-related genes. Quantitative real-time PCR analyses revealed that the transcription expression of the flg genes (encoding the structural components for flagella basal body) was down-regulated by the mucin components. Indeed, bacterial swarming motility was drastically reduced when grown on 0.3% trypton agar plates containing the mucin. These results imply that gastrointestinal (GI) mucin is a possible environmental signal which negatively regulates the flagellation of EHEC O157:H7 in the GI tract.
Division of Enteric Bacterial Infections, Center for Infectious Diseases Research, Korea National Institute of Health, Chungcheongbuk-do 363-951, Republic of Korea.
Jong Chul
JC
Kim
Jang W
JW
Yoon
Cheorl-Ho
CH
Kim
Mi-Sun
MS
Park
Seung-Hak
SH
Cho
D000818:Animals; D019453:Escherichia coli O157 / Q000187:drug effects / Q000235:genetics* / Q000502:physiology*; D005407:Flagella / Q000187:drug effects / Q000235:genetics* / Q000502:physiology; D005753:Gastric Mucosa / Q000378:metabolism; D015964:Gene Expression Regulation, Bacterial; D009077:Mucins / Q000378:metabolism* / Q000494:pharmacology; D013552:Swine; D014158:Transcription, Genetic; D059467:Transcriptome
D009077:Mucins