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A Glu139Asp mutant of the NtpK subunit (kE139D) of Enterococcus hirae vacuolar-type ATPase (V-ATPase) lost tolerance to sodium but not to lithium at pH 10. Purified kE139D V-ATPase retained relatively high specific activity and affinity for the lithium ion compared to the sodium ion. The kE139 residue of V-ATPase is indispensable for its enzymatic activity that is linked with the salt tolerance of enterococci.

Significance of the Glutamate-139 Residue of the V-Type Na+-ATPase NtpK Subunit in Catalytic Turnover Linked with Salt Tolerance of Enterococcus hirae