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Dependence on Na + of control of cytoplasmic pH in a facultative alkalophile
Author(s) -
McLaggan Debbie,
Selwyn Michael J.,
Dawson Alan P.
Publication year - 1984
Publication title -
febs letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.593
H-Index - 257
eISSN - 1873-3468
pISSN - 0014-5793
DOI - 10.1016/0014-5793(84)80180-5
Subject(s) - cytoplasm , antiporter , chemistry , facultative , biophysics , biochemistry , membrane , biology , botany
Regulation of the cytoplasmic pH of Exiguobacterium aurantiacum is dependent on the presence of Na + in the medium. The data suggest that above 500 μM external Na + the cells are able to regulate the cytoplasmic pH by the operation of a Na + cycle involving a Na + /H + antiport and a route for rapid Na + entry. Our data indicate that the rate of entry of Na + is subject to control by the cytoplasmic pH via feedback inhibition.