Regulation of expression of the Escherichia coli K-12 mtr gene by TyrR protein and Trp repressor.

Abstract:

:The Escherichia coli K-12 mtr gene, which encodes a tryptophan-specific permease, was cloned, and its nucleotide sequence was determined. The precise location of the mtr gene at 69 min on the E. coli chromosome was determined. The mtr gene product was identified as a 414-amino-acid residue protein with a calculated molecular weight of 44,332. The protein is very hydrophobic, consistent with its presumed location spanning the cytoplasmic membrane. The initiation sites of transcription and translation were identified. Construction of an mtr-lacZ transcriptional fusion facilitated investigation of the molecular basis of mtr regulation. The TyrR protein in association with phenylalanine or tyrosine is responsible for the activation of mtr expression, whereas the Trp repressor in conjunction with tryptophan serves to repress expression of this gene. Site-directed mutagenesis confirmed that sequences in the mtr regulatory region homologous to TyrR protein and to Trp repressor-binding sites were involved in the activation and repression of mtr expression, respectively. Sequences homologous to sigma 70- and sigma 54-dependent promoters were identified upstream of the transcription start point of mtr. It was determined that transcription of mtr occurs only via a sigma 70-dependent promoter.

journal_name

J Bacteriol

journal_title

Journal of bacteriology

authors

Sarsero JP,Wookey PJ,Pittard AJ

doi

10.1128/jb.173.13.4133-4143.1991

subject

Has Abstract

pub_date

1991-07-01 00:00:00

pages

4133-43

issue

13

eissn

0021-9193

issn

1098-5530

journal_volume

173

pub_type

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