TABLE 1.

V. cholerae NhaR increases Na⁺-dependent expression of an E. coli nhaA::lacZ protein fusion

Straina	β-Galactosidase activity (Miller units)b
	No NaCl	100 mM NaCl
RK33Z	59.7	317
RK33Z(pGM42T)	71	1,276
RK33Z(pPM3091)	119	1,978

^aStrain RK33Z (nhaA::lacZ) was transformed with pGM42T (E. coli nhaR [20]) or pPM3091 (V. cholerae nhaR). 

^bThe cells were induced with Na⁺ (100 mM) for 150 min, and β-galactosidase activity was determined as previously described (9).