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Na,K‐Pump Reaction Kinetics at the Tip of a Patch Electrode
Author(s) -
PELUFFO R. DANIEL,
BERLIN JOSHUA R.
Publication year - 2003
Publication title -
annals of the new york academy of sciences
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.712
H-Index - 248
eISSN - 1749-6632
pISSN - 0077-8923
DOI - 10.1111/j.1749-6632.2003.tb07151.x
Subject(s) - chemistry , electrophysiology , kinetics , steady state (chemistry) , ion channel , ion transporter , ion , biophysics , ion pump , patch clamp , electrode , redox , inorganic chemistry , biochemistry , neuroscience , physics , receptor , organic chemistry , quantum mechanics , biology
A bstract : Patch‐clamp electrophysiological techniques allow manipulations of electrochemical driving forces for ion transport by the Na,K‐ATPase. For this reason, this technique has been used to study steady‐state ion transport properties of the Na,K‐ATPase. High temporal resolution during these manipulations also permits rapid reactions, such as extracellular ion‐binding reactions, to be measured as charge movements when the enzyme is engaged in electroneutral ion exchange modes. Just as useful, but less widely recognized, is the ease with which electrophysiological techniques can be used to critically study reaction steps that do not directly involve ion binding. Three studies are briefly presented to show how pre‐steady‐state and/or steady‐state electrophysiological techniques can be used to study ion‐binding reactions in a novel fashion and the kinetics of electrically silent reaction steps of this enzyme. The reaction kinetics derived from each of these studies can be used to attain detailed mechanistic information about ion transport by the Na,K‐ATPase.