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Transcription in the region of the replication origin, oriC, of Escherichia coli: termination of asnC transcripts


Transcription in the region of the replication origin, oriC, of Escherichia coli: termination of asnC transcripts



Molecular and General Genetics: Mgg 214(3): 474-481



ISSN/ISBN: 0026-8925

PMID: 2464126

Transcription from the asnC promoter was found to proceed through the replication origin, oriC, into the gidA gene of Escherichia coli. Between 10% and 20% of asnC transcripts reached oriC in vivo. Termination sites in the intergenic region between asnC and mioC and within mioC were determined in vivo and in vitro using S1 mapping. Only about 10% of the transcripts terminated at the asnC terminator in vivo. DnaA protein dependent termination was observed close to the binding site, dnaA box, for DnaA protein. In the in vitro replication system asnC transcripts did not reach oriC, suggesting that asnC transcripts are not involved in the initiation of replication, contrary to mioC transcripts. We suggest that oriC and mioC might have been transposed during evolution into an asnC regulation.

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Accession: 041832089

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