Article
Identification and characterization of functional residues in a Na+/H+ antiporter (NhaA) from Escherichia coli by random mutagenesis.
Journal of biochemistry - 1 Apr 1997
Noumi T, Inoue H, Sakurai T, Tsuchiya T, Kanazawa H
Abstract excerpt
Forty-one mutants were isolated by means of random PCR mutagenesis of the Escherichia coli Na+/H+ antiporter (nhaA), which could not support the growth of a nhaAnhaB mutant (HIT delta AB-) on plates containing 0.15 M LiCl (pH 7.5) or 0.65 M NaCl (pH 8.0). Most of the mutants were sensitive to both NaCl and LiCl, or to LiCl alone. DNA sequencing revealed that twelve of the mutants had single amino acid...
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