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American Zoologist 1984 24(1):177-185; doi:10.1093/icb/24.1.177
© 1984 by The Society for Integrative and Comparative Biology
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Membrane-Bound ATPases in Arthropod Ion-Transporting Tissues1

DAVID W. TOWLE
Department of Biology, University of Richmond Richmond, Virginia 23173

Since Na$$K$-activated ATPase was first described, using arthropod tissues, it has become well-recognized as the enzymatic equivalent of the sodium pump. Occurring in the basolateral plasma membranes of epithelial ion-transporting cells, it is responsible for the transport of Na$ out of cells in exchange for the cytosol-directed movement of a counterion (K$ or NH4$). Its kinetic and dynamic properties suggest that it serves as a major limiting factor in whole-body Na$ regulation by aquatic arthropods. Its contribution to NH4$ excretion awaits isolation of Na$ $ K$-ATPase-enriched membrane fractions and determination of their transport properties. The role of Na$$K$-ATPase in insect epitheha is made uncertain by the apparent inaccessibility of the ATPase to the inhibitor ouabain. Two other membrane-bound ATPases, K$-stimulated ATPase and anion-dependent ATPase, have been described in arthropod tissues, but their physiological roles are not clear.


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