Involvement of electrostatic phenomena in phospholamban‐induced stimulation of Ca uptake into cardiac sarcoplasmic reticulum
Involvement of electrostatic phenomena in phospholamban‐induced stimulation of Ca uptake into cardiac sarcoplasmic reticulum
复制标题
静电现象参与受磷蛋白诱导的心肌肌浆网 Ca 摄取刺激
DOI:
10.1016/0014-5793(89)81201-3
复制
发表时间:
1989
期刊:
影响因子:
3.5
通讯作者:
R. Schwaller
中科院分区:
文献类型:
--
作者:
M. Chiesi;R. Schwaller
The activity of the Ca-pumping ATPase of cardiac sarcoplasmic reticulum (SR) is controlled by the phosphorylation of the intrinsic regulatory protein phospholamban (PLB), which affects both the apparentKm(Ca) and theVmaxof the transport process. We have investigated the correlation between phosphorylation of PLB and the surface potential of the SR membrane. This latter influences the local concentration of relevant ionic species near biological membranes and thus modulates the activity of ion pumps and channels. The partitioning of the anionic probe 8-anilino-1-naphthalenesulfonate (ANS−) into the SR membrane was found to be dependent on the phosphorylation level of PLB. Changes of the surface membrane potential up to 7 mV could be obtained by phosphorylation. The increase in the apparent affinity of the Ca pump for Ca2+induced by PLB phosphorylation was clearly reduced at high ionic strength, i.e. under conditions known to reduce the surface membrane potential and all processes dependent on it. The results show that electrostatic phenomena can account, in good part, for the modulation of the Ca pump by PLB in cardiac SR.
DOI:
--
发表时间:
1983
期刊:
The Journal of biological chemistry
影响因子:
--
作者:
Chamberlain,BK;Levitsky,DO;Fleischer,S
通讯作者:
Fleischer,S
DOI:
--
发表时间:
1983
期刊:
The Journal of biological chemistry
影响因子:
--
作者:
Iwasa,Y;Hosey,MM
通讯作者:
Hosey,MM
DOI:
--
发表时间:
1984
期刊:
The Journal of biological chemistry
影响因子:
--
作者:
Wegener,AD;Jones,LR
通讯作者:
Jones,LR