Abstract
A gene has been cloned from a DNA library from the marine bacterium Vibrio alginolyticus that functionally complements a mutant strain of Escherichia coli, NM81, defective in an Na +/H + antiporter (NhaA). The cloned Vibrio gene restored NM81 to grow in a medium containing 0.5 M NaCl at pH 7.5 and concomitantly led to an increase in Na +/H + antiport activity. The nucleotide sequence of the cloned fragment revealed an open reading frame, which encodes a protein with a predicted 383 amino acid sequence and molecular mass of 40400 Da. The hydropathy profile is characteristic of a membrane protein with 11 membrane spanning regions. The deduced amino acid sequence is 58% identical with E. coli NhaA.
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