NDLI: Specific interaction of IHF with RIBs, a class of bacterial repetitive DNA elements located at the 3' end of transcription units.

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Specific interaction of IHF with RIBs, a class of bacterial repetitive DNA elements located at the 3' end of transcription units.

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Specific interaction of IHF with RIBs, a class of bacterial repetitive DNA elements located at the 3' end of transcription units.

Content Provider	PubMed Central
Author	Boccard, F. Prentki, P.
Abstract	The prokaryotic REP (repetitive extragenic palindromes) or PU (palindromic units) sequences are often associated with other repetitive elements, forming arrangements which have been called 'BIMEs' (bacterial interspersed mosaic elements). It is estimated that the Escherichia coli chromosome carries approximately 300-500 BIMEs, whose biological role is at present unknown. We have identified a family of BIMEs consisting of two converging REP sequences flanking a 35 bp conserved segment which carries a static DNA bend and a binding site for IHF, the integration host factor of E.coli. We estimate that the E.coli genome harbors approximately 100 copies of this module, which we name 'RIB' (reiterative ihf BIME). We have analyzed by gel retardation and by footprinting the in vitro interaction of IHF with individual RIBs, and shown that the protein binds strongly and specifically to their center. We have also demonstrated binding of IHF to the chromosomal population of RIBs, using a new approach which combines two-dimensional bandshift and Southern blotting. RIB elements are at the end of transcription units, and thus define a new class of ihf sites. Possible implications for genome structure and DNA topology are discussed.
Starting Page	5019
File Format	PDF
ISSN	14602075
e-ISSN	14602075
Journal	The EMBO Journal
Issue Number	13
Volume Number	12
Language	English
Publisher Date	1993-12-15
Access Restriction	Open
Subject Keyword	Research in Higher Education
Content Type	Text
Resource Type	Article
Subject	Neuroscience Immunology and Microbiology Medicine Molecular Biology

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