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Na + /H + antiport in isolated plasma membrane vesicles from the halotolerant alga Dunaliella salina
Author(s) -
Katz Adriana,
Kaback H.Ronald,
Avron Mordhay
Publication year - 1986
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(86)80665-2
Subject(s) - dunaliella salina , antiporter , halotolerance , vesicle , symporter , dunaliella , amiloride , chemistry , photosynthesis , sodium , intracellular , biophysics , membrane , biochemistry , biology , botany , algae , salinity , ecology , transporter , organic chemistry , gene
Plasma membrane vesicles isolated from the halotolerant alga Dunaliella salina catalyze Na + /H + antiport in a manner that is highly specific for Na + (apparent K m ≅ 16 mM). Li + and amiloride inhibit the process competitively with apparent K i values of 38 and 37 μM, respectively. It is suggested that Na + /H + antiport in this organism plays a major role in maintaining low intracellular Na + concentrations and may also function to drive Na + /HCO 3 − symport, an important step in photosynthetic carbon fixation.