Analysis of a Rhizobium leguminosarum gene encoding a protein homologous to glutathione S-transferases

Tawfiq Alkafaf, Najláa K., Yeoman, Kay H., Wexler, Margaret, Hussain, Haitham and Johnston, Andrew W. B. (1997) Analysis of a Rhizobium leguminosarum gene encoding a protein homologous to glutathione S-transferases. Microbiology, 143 (3). pp. 813-822. ISSN 1350-0872

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A novel Rhizobium leguminosarum gene, gstA, the sequence of which indicated that it was a member of the gene family of glutathione S-transferases (GSTs), was identified. The homology was greatest to the GST enzymes of higher plants. The Rhizobium gstA gene was normally expressed at a very low level. The product of gstA was over-expressed and purified from Escherichia coli. It was shown to bind to the affinity matrix glutathione-Sepharose, but no enzymic GST activity with 1-chloro-2,4-dinitrobenzene as substrate was detected. gstA encoded a polypeptide of 203 amino acid residues with a calculated molecular mass of 21,990 Da. Transcribed divergently from gstA is another gene, gstR, which was similar in sequence to the LysR family of bacterial transcriptional regulators. A mutation in gstR had no effect on the transcription of itself or gstA under the growth conditions used here. Mutations in gstA and gstR caused no obvious phenotypic defect and the biological functions of these genes remain to be determined.

Item Type: Article
Uncontrolled Keywords: glutathione,glutathione s-transferase,rhizobium,transcriptional regulator
Faculty \ School:
Faculty of Science > School of Biological Sciences
Related URLs:
Depositing User: Pure Connector
Date Deposited: 26 Nov 2013 12:54
Last Modified: 24 Oct 2022 05:05
DOI: 10.1099/00221287-143-3-813

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