the effect of cpa on the sarcoplasmic reticulum ca2+-atpase appears to be fairly specific , since the kidney and brain na+ , k+-atpase ( ec 3.6.1.37 ) , the gastric h+ , k+-atpase ( ec 3.6.1.36 ) , the mitochondrial f1-atpase ( ec 3.6.1.34 ) , the ca2+-atpase of erythrocytes , and the mg2+-activated atpase of t-tubules and surface membranes of rat skeletal muscle were not inhibited by cpa , even at concentrations as high as 1000 nmol/mg protein .
C0916181
sarcoplasmic reticulum ca2
C0001476
ca2