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. 1980 Aug;143(2):761–771. doi: 10.1128/jb.143.2.761-771.1980

Restriction map of the Escherichia coli malA region and identification of the malT product.

O Raibaud, M Schwartz
PMCID: PMC294359  PMID: 6259122

Abstract

A series of plaque-forming lambda h80 transducing phages carrying various portions of the malA region were isolated. A 5,800-base pair HindIII-EcoRI DNA fragment from one of these phages was cloned into pBR322 and shown to contain malT, which is the positive regulator gene of the maltose regulon, and most of malP, the structural gene for maltodextrin phosphorylase. A restriction map of the HindIII-EcoRI fragment was established, and it was correlated with the genetic map of the malA region (i) by mapping deletions which had been generated in vitro on the plasmid and (ii) by locating on the restriction map a DNA insertion of known genetic position. A 600-base pair HincII-HaeII segment was shown to contain all or part of the promoters for malT and malP, which are known to be transcribed in opposite directions. Strains carrying gene malT on a plasmid synthesized a 94,000-dalton polypeptide which was not produced by identical strains carrying similar plasmids in which malT was partially deleted. Estimates of the size of the malT gene support the conclusion that the 94,000-dalton polypeptide is the malT product.

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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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