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“ Suramin increased the apparent calcium affinity to the activating high-affinity calcium binding sites and reduced the apparent magnesium affinity to the inhibitory low affinity Ca(2+)/Mg(2+) binding sites.”
“The ability of suramin to diminish ATP-dependent Ca++ accumulation by SR vesicles therefore reflects two distinct actions: 1) activation (opening) of the SR Ca++ release channel and 2) inhibition of the Ca++ pump.”