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FEBS Lett. 1995 Mar 20;361(2-3):153-6.

Stoichiometry of K+/H+ antiport helps to explain extracellular pH 11 in a model epithelium.

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Zoologisches Institut der Universit√§t, M√ľnchen, Germany.


The stoichiometry of K+/H+ antiport was measured fluorometrically by the static head method in highly purified vesicles from goblet cell apical membranes of larval lepidopteran midgut. The measured stoichiometry of 1 K+/2 H+ explains how the antiport results in electrophoretic exchange of extracellular H+ for intracellular K+, driven by the voltage component of the proton-motive force of an H+ translocating V-ATPase that is located in the same membrane. In turn, the exchange of K+ for H+ helps to explain how the midgut contents are alkalinized to a pH of 11.

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