Shamoo A E, MacLennan D H
Proc Natl Acad Sci U S A. 1974 Sep;71(9):3522-6. doi: 10.1073/pnas.71.9.3522.
Solubilized Ca(++) + Mg(++)-dependent adenosinetriphosphatase (EC 3.6.1.3; ATP diphosphohydrolase) from sarcoplasmic reticulum increased bimolecular lipid membrane (oxidized cholesterol) conductance several hundred-fold. The relative conductance change and the relative permeability elicited by this material has the following sequence: Ba(++) > Ca(++) > Sr(++) > Mg(++) > Mn(++) > Zn(++), Na(+), K(+), Cs(+), Li(+), and Rb(+). Zn(++) and Na(+) strongly inhibit the increase in Ca(++) conductance obtained with solubilized Ca(++) + Mg(++)-dependent adenosinetriphosphatase. The Ca(++)-ionophore is an integral part of the Ca(++) + Mg(++)-dependent adenosinetriphosphatase enzyme and may function as a Ca(++)-carrier in the overall Ca(++)-pump of sarcoplasmic reticulum.
来自肌浆网的可溶性钙(++)+镁(++)依赖性三磷酸腺苷酶(EC 3.6.1.3;ATP二磷酸水解酶)使双分子脂质膜(氧化胆固醇)的电导率增加了数百倍。该物质引起的相对电导率变化和相对渗透率具有以下顺序:钡(++)>钙(++)>锶(++)>镁(++)>锰(++)>锌(++)、钠(+)、钾(+)、铯(+)、锂(+)和铷(+)。锌(++)和钠(+)强烈抑制可溶性钙(++)+镁(++)依赖性三磷酸腺苷酶所导致的钙(++)电导率增加。钙(++)离子载体是钙(++)+镁(++)依赖性三磷酸腺苷酶的一个组成部分,并且可能在肌浆网的整体钙(++)泵中作为钙(++)载体发挥作用。