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The Journal of General Physiology, Vol 67, 251-261, Copyright © 1976 by The Rockefeller University Press

ARTICLES

Phosphorylation of the red blood cell membrane during the active transport of C++

YN Cha and KS Lee

The phosphorylation of red blood cell membrane fragments (RBCMF) during Ca++ transport was investigated. When red cell membrane fragments are incubated with [gamma-32P]ATP under the experimental condition which minimizes the phosphorylation of Na+-K+-ATPase, RBCMF are labeled in the presence of Mg++ without Ca++. When Ca++ is added, the labeling decreases due to dephosphorylation of RBCMF. The initial reaction of phosphorylation is reversed in the presence of excess ADP. The treatment of RBCMF with n-ethylmaleimide (NEM) does not interfere with the initial phosphorylation reaction, but blocks the dephosphorylation in the presence of Ca++. These data suggest that the enzymatic sequence of the Ca++ transport mechanism may be very similar to that of the Na+ transport mechanism.
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