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- W2015963233 abstract "The time course of changes in the intravesicular Ca2+ concentration ([Ca2+]i) in terminal cisternal sarcoplasmic reticulum vesicles upon the induction of Ca2+ release was investigated by using tetramethylmurexide (TMX) as an intravesicular Ca2+ probe. Upon the addition of polylysine at the concentration that led to the maximum rate of Ca2+ release, [Ca2+]i decreased monotonically in parallel with Ca2+ release. Upon induction of Ca2+ release by lower concentrations of polylysine, [Ca2+]i first increased above the resting level, followed by a decrease well below it. The release triggers polylysine, and caffeine brought about dissociation of calcium that bound to a nonvesicular membrane segment consisting of the junctional face membrane and calsequestrin bound to it, as monitored with TMX. No Ca2+ dissociation from calsequestrin-free junctional face membranes or from the dissociated calsequestrin was produced by release triggers, but upon reassociation of the dissociated calsequestrin and the junctional face membrane, Ca2+ dissociation by triggers was restored. On the basis of these results, we propose that the release triggers elicit a signal in the junctional face membrane, presumably in the foot protein moiety, which is then transmitted to calsequestrin, leading to the dissociation of the bound calcium; and in SR vesicles, to the transient increase of [Ca2+]i, and subsequently release across the membrane." @default.
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- W2015963233 date "1991-05-28" @default.
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- W2015963233 title "Intravesicular calcium transient during calcium release from sarcoplasmic reticulum" @default.
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- W2015963233 doi "https://doi.org/10.1021/bi00235a017" @default.
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