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. 1987 Aug;169(8):3764–3769. doi: 10.1128/jb.169.8.3764-3769.1987

Complementation of a trpE deletion in Escherichia coli by Spirochaeta aurantia DNA encoding anthranilate synthetase component I activity.

B Brahamsha, E P Greenberg
PMCID: PMC212463  PMID: 3038849

Abstract

A 2.7-kilobase Sau3A fragment of Spirochaeta aurantia DNA cloned in pBR322 complemented a trpE deletion in Escherichia coli. Deletion analysis and Tn5 mutagenesis of the resulting plasmid pBG100 defined a 2-kilobase-pair region that was required for both the complementation and the synthesis of 59,000- and 47,000-molecular-weight polypeptides (59K and 47K polypeptides) in maxicells. Both the 59K and the 47K polypeptides appear to be encoded by a single gene. A maxicell analysis of pBG100::Tn5 mutants suggests that the 47K polypeptide is not sufficient for the trpE complementation. In vitro and in vivo anthranilate synthetase (AS) assays indicate that the complementing activity encoded by pBG100 was functionally analogous to the AS component I of E. coli in that it utilized NH3 but not glutamine as the amino donor. pBG100 did not encode a glutamine amidotransferase activity, although the AS component I it encoded was capable of interacting with E. coli AS component II to catalyze the glutamine-requiring reaction. Expression appeared to depend on a promoter in the cloned S. aurantia DNA.

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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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