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. 1987 Feb;169(2):526–532. doi: 10.1128/jb.169.2.526-532.1987

Divergent transcription of the sn-glycerol-3-phosphate active transport (glpT) and anaerobic sn-glycerol-3-phosphate dehydrogenase (glpA glpC glpB) genes of Escherichia coli K-12.

M Ehrmann, W Boos, E Ormseth, H Schweizer, T J Larson
PMCID: PMC211809  PMID: 3027032

Abstract

The glpTQ operon and the glpA and glpB genes are located adjacent to one another near min 49 of the linkage map of Escherichia coli K-12. The positions and directions of transcription of the glpA and glpB genes with respect to the glpTQ operon were determined in the present work. Strains harboring Mu d1(Ap lac) fusions in either glpA or glpB were converted to the respective lambda p1(209) lysogens. Induction of these lysogens with mitomycin C resulted in production of Lac+ phage progeny which carried adjacent chromosomal DNA. Genetic crosses with a collection of glpT mutant strains were performed with several such phage lines. A fine-structure deletion map of the glpT gene was thus constructed. All phages used for this mapping carried DNA starting with the promoter-proximal end of glpT. This indicated that the glpTQ operon and the glpA and glpB genes are transcribed divergently. Additional evidence supporting this conclusion was obtained by physical mapping of restriction endonuclease cleavage sites in plasmids carrying these genes and in plasmids carrying glpA-lacZ or glpB-lacZ fusions. A new designation (glpC) for the gene encoding the 41,000-Mr subunit of the anaerobic sn-glycerol-3-phosphate dehydrogenase was proposed to distinguish it from the glpA gene, which encodes the 62,000-Mr subunit of the dehydrogenase, and the glpB gene, which encodes a membrane anchor subunit of the dehydrogenase. These three genes were present in an operon transcribed in the order glpA glpC glpB in the clockwise direction on the linkage map of E. coli.

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Selected References

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