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. 1984 Dec 15;224(3):799–815. doi: 10.1042/bj2240799

DNA sequence around the Escherichia coli unc operon. Completion of the sequence of a 17 kilobase segment containing asnA, oriC, unc, glmS and phoS.

J E Walker, N J Gay, M Saraste, A N Eberle
PMCID: PMC1144516  PMID: 6395859

Abstract

The nucleotide sequence is described of a region of the Escherichia coli chromosome extending from oriC to phoS that also includes the loci gid, unc and glmS. Taken with known sequences for asnA and phoS this completes the sequence of a segment of about 17 kilobases or 0.4 min of the E. coli genome. Sequences that are probably transcriptional promoters for unc and phoS can be detected and the identity of the unc promoter has been confirmed by experiments in vitro with RNA polymerase. Upstream of the promoter sequence is an extensive region that appears to be non-coding. Conserved sequences are found that may serve to concentrate RNA polymerase in the vicinity of the unc promoter. Hairpin loop structures resembling known rho-independent transcription termination signals are evident following the unc operon and glmS. The glmS gene encoding the amidotransferase, glucosamine synthetase, has been identified by homology with glutamine 5-phosphoribosylpyrophosphate amidotransferase.

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Selected References

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