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Journal of Experimental Biology, Vol 168, Issue 1 151-159, Copyright © 1992 by Company of Biologists

JOURNAL ARTICLES

Sodium-extruding and calcium-extruding sodium/calcium exchangers display similar calcium affinities

TJ Schoenmakers and G Flik
Department of Animal Physiology, Faculty of Science, University of Nijmegen, The Netherlands.

Na+/Ca2+ exchange activities in purely inside-out and mixed inside-out and right-side-out fish enterocyte basolateral plasma membrane vesicle preparations display equal affinities for Ca2+, showing that only the intracellular Ca2+ transport site of the Na+/Ca2+ exchanger is detected in experiments on vesicle preparations with mixed orientation. Therefore, Ca2+ pump and Na+/Ca2+ exchange activity may be compared directly without correction for vesicle orientation. The Na+/Ca2+ exchange activity in fish enterocyte vesicles is compared to the activity found in dog erythrocyte vesicles. The calcium-extruding exchanger in fish basolateral plasma membranes shows values of Km and V(max) for calcium similar to those found for the sodium-extruding exchanger in dog erythrocyte membranes, indicating that differences in electrochemical gradients underlie the difference in cellular function of the two exchangers.


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© The Company of Biologists Ltd 1992