2010 Volume 74 Issue 5 Pages 1116-1119
Hitherto, the roles of specific amino acid residues of ChaA, one of three Na+/H+ antiporters in Escherichia coli, in exchange activity have not been reported. Here we examined the role of acidic amino acid residues, Glu-85 and Glu-325, on the hydrophobic transmembrane domains. It was found that ChaA is involved in salt tolerance at alkaline pH. Mutagenesis analyses revealed the importance of Glu-85, but not Glu-325, in the exchange activity.
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