Transcription profiling of E. coli K-12 W3110 strain grown at Ph5.7, 7.0, 8.5 reveals pH and anaerobiosis coregulate metabolism, multidrug transporters, and envelope composition

ABSTRACT: In Escherichia coli, pH-dependent gene expression varies with oxygen level. Anaerobic pH-dependent expression ratios were analyzed and compared to the published analysis of aerated cultures (Maurer et al, 2005). E. coli K-12 strain W3110 was cultured in closed tubes containing LBK broth buffered at pH 5.7, pH 7.0, and pH 8.5. Gene expression profiles were obtained by cDNA hybridization to Affymetrix arrays. pH-dependent expression was seen for 1,394 genes, of which 1,002 show no pH dependence under aeration. Four intergenic regions containing regulatory sRNAs were up-regulated by acid anaerobically (ryeA, csrB, gadY, rybC) and one sRNA (ryhA) by acid with aeration. Acid and anaerobiosis co-regulated the gad regulon; drug transporters (mdtEF, mdtL); catabolism of sugar derivatives w

ORGANISM(S): Escherichia coli

SUBMITTER: Joan Lyn Slonczewski 

PROVIDER: E-GEOD-4556 | biostudies-arrayexpress |

REPOSITORIES: biostudies-arrayexpress