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Transcriptional organization of the F1845 fimbrial adhesin determinant of Escherichia coli
Author(s) -
Bilge Sima S.,
Apostol John M.,
Fullner Karia Jean,
Moseley Steve L.
Publication year - 1993
Publication title -
molecular microbiology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.857
H-Index - 247
eISSN - 1365-2958
pISSN - 0950-382X
DOI - 10.1111/j.1365-2958.1993.tb01191.x
Subject(s) - biology , gene , primer extension , catabolite repression , genetics , bacterial adhesin , promoter , escherichia coli , open reading frame , homology (biology) , binding site , nucleic acid sequence , microbiology and biotechnology , gene expression , peptide sequence , messenger rna , mutant
Summary The transcriptional organization of the gene cluster encoding the F1845 fimbrial adhesin of a diarrhoea‐associated Escherichia coli was investigated. Genes daaA to daaE were determined to constitute a single transcriptional unit under the control of the daaA promoter. The nucleotide sequence of daaA and that of an upstream open reading frame encoded on the opposite strand, designated daaF , were determined to share limited homology with the papB and papi genes of the P fimbrial adhesin, respectively. The 5′ termini of the daaF and daaABCDE transcripts were mapped by primer extension and nuclease protection analyses. The promoters for these transcripts were associated with potential regulatory sequences including two consensus leucine‐responsive regulatory protein (Lrp)‐binding sites which contained differentially methylated GATC sequences, a cAMP‐CRP‐binding site, and an integration host factor (IHF)‐binding site. Expression of the daa locus was determined to be dependent on Lrp, subject to catabolite repression, and dependent on IHF.