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. 1991 Jun;173(11):3601–3604. doi: 10.1128/jb.173.11.3601-3604.1991

The tryptophan-specific permease gene, mtr, is differentially regulated by the tryptophan and tyrosine repressors in Escherichia coli K-12.

V M Heatwole 1, R L Somerville 1
PMCID: PMC207980  PMID: 1904443

Abstract

The regulation of transcription of the gene for the tryptophan-specific permease, mtr, was evaluated in several genetically marked Escherichia coli strains through the use of a single-copy lacZ reporter system. The expression of mtr was repressed 97-fold by tryptophan via the Trp repressor and induced 10-fold by phenylalanine or tyrosine via the Tyr repressor. By primer extension analysis two distinct mtr transcripts and their corresponding promoters were identified. One transcript was induced by the Tyr repressor. The tryptophan-dependent interaction of Trp repressor with an operator target within the mtr promoter was demonstrated by means of a restriction endonuclease protection assay.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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