Nucleotide sequence of traQ and adjacent loci in the Escherichia coli K-12 F-plasmid transfer operon
10.1128/jb.171.1.213-221.1989
Crossref journal-article
American Society for Microbiology
Journal of Bacteriology (235)
Abstract

The F tra operon region that includes genes trbA, traQ, and trbB was analyzed. Determination of the DNA sequence showed that on the tra operon strand, the trbA gene begins 19 nucleotides (nt) distal to traF and encodes a 115-amino-acid, Mr-12,946 protein. The traQ gene begins 399 nt distal to trbA and encodes a 94-amino-acid, Mr-10,867 protein. The trbB gene, which encodes a 179-amino-acid, Mr-19,507 protein, was found to overlap slightly with traQ; its start codon begins 11 nt before the traQ stop codon. Protein analysis and subcellular fractionation of the products expressed by these genes indicated that the trbB product was processed and that the mature form of this protein accumulated in the periplasm. In contrast, the protein products of trbA and traQ appeared to be unprocessed, membrane-associated proteins. The DNA sequence also revealed the presence of a previously unsuspected locus, artA, in the region between trbA and traQ. The artA open reading frame was found to lie on the DNA strand complementary to that of the F tra operon and could encode a 104-amino-acid, 12,132-dalton polypeptide. Since this sequence would not be expressed as part of the tra operon, the activity of a potential artA promoter region was assessed in a galK fusion vector system. In vivo utilization of the artA promoter and translational start sites was also examined by testing expression of an artA-beta-galactosidase fusion protein. These results indicated that the artA gene is expressed from its own promoter.

Authors 2
  1. J H Wu (first)
  2. K Ippen-Ihler (additional)
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Dates
Type When
Created 8 years, 9 months ago (Nov. 4, 2016, 1:33 p.m.)
Deposited 4 years, 1 month ago (July 29, 2021, 1:42 p.m.)
Indexed 1 year, 1 month ago (July 3, 2024, 8:42 a.m.)
Issued 36 years, 8 months ago (Jan. 1, 1989)
Published 36 years, 8 months ago (Jan. 1, 1989)
Published Print 36 years, 8 months ago (Jan. 1, 1989)
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@article{Wu_1989, title={Nucleotide sequence of traQ and adjacent loci in the Escherichia coli K-12 F-plasmid transfer operon}, volume={171}, ISSN={1098-5530}, url={http://dx.doi.org/10.1128/jb.171.1.213-221.1989}, DOI={10.1128/jb.171.1.213-221.1989}, number={1}, journal={Journal of Bacteriology}, publisher={American Society for Microbiology}, author={Wu, J H and Ippen-Ihler, K}, year={1989}, month=jan, pages={213–221} }