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• W1981466378 abstract "The Gram-positive bacterium Enterococcus hirae has a vacuolar-type Na+-translocating ATPase that is encoded by the ntp operon (ntpFIKECGABDHJ) (Takase, K., Kakinuma, S., Yamato, I., Konishi, K., Igarashi, K., and Kakinuma, Y. (1994) J. Biol. Chem. 269, 11037-11044). Primer extension experiments identified the start site of transcription of this operon upstream of the ntpF gene. In parallel with the increases of both Na+-pumping activity in whole cells and Na+-stimulated ATPase activity in the membranes, the amounts of the two major subunits (A and B) of this enzyme increased remarkably in cells grown on medium containing high concentrations of NaCl but not on medium containing KCl or sorbitol. Chloramphenicol completely abolished the increases of the enzyme activity and the amounts of A and B subunits, suggesting that the Na+-ATPase level increased by de novo synthesis of the enzyme with the stimulation of high concentrations of the external sodium ions. Finally, Western blot and Northern blot experiments revealed that the increase in the Na+-ATPase level with the external Na+ was further accelerated by addition of an ionophore, such as monensin, which rendered the cell membrane permeable to Na+. These results suggest that the transcription of the Na+-ATPase operon is regulated by the intracellular concentration of sodium ions. The Gram-positive bacterium Enterococcus hirae has a vacuolar-type Na+-translocating ATPase that is encoded by the ntp operon (ntpFIKECGABDHJ) (Takase, K., Kakinuma, S., Yamato, I., Konishi, K., Igarashi, K., and Kakinuma, Y. (1994) J. Biol. Chem. 269, 11037-11044). Primer extension experiments identified the start site of transcription of this operon upstream of the ntpF gene. In parallel with the increases of both Na+-pumping activity in whole cells and Na+-stimulated ATPase activity in the membranes, the amounts of the two major subunits (A and B) of this enzyme increased remarkably in cells grown on medium containing high concentrations of NaCl but not on medium containing KCl or sorbitol. Chloramphenicol completely abolished the increases of the enzyme activity and the amounts of A and B subunits, suggesting that the Na+-ATPase level increased by de novo synthesis of the enzyme with the stimulation of high concentrations of the external sodium ions. Finally, Western blot and Northern blot experiments revealed that the increase in the Na+-ATPase level with the external Na+ was further accelerated by addition of an ionophore, such as monensin, which rendered the cell membrane permeable to Na+. These results suggest that the transcription of the Na+-ATPase operon is regulated by the intracellular concentration of sodium ions." @default.
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• W1981466378 date "1996-09-01" @default.
• W1981466378 modified "2023-09-28" @default.
• W1981466378 title "Intracellular Na+ Regulates Transcription of the ntp Operon Encoding a Vacuolar-type Na+-translocating ATPase in Enterococcus hirae" @default.
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• W1981466378 doi "https://doi.org/10.1074/jbc.271.39.23661" @default.
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