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
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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
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发表时间:
1989
期刊:
影响因子:
3.5
通讯作者:
R. Schwaller
R. Schwaller
中科院分区:
生物学3区
文献类型:
--
作者:
M. Chiesi;R. Schwaller

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相似文献

心脏肌浆网 (SR) 的 Ca 泵 ATP 酶活性由内在调节蛋白受磷蛋白 (PLB) 的磷酸化控制,这会影响转运过程的表观 Km(Ca) 和 Vmax。我们研究了 PLB 磷酸化与 SR 膜表面电位之间的相关性。后者影响生物膜附近相关离子种类的局部浓度,从而调节离子泵和通道的活性。研究发现阴离子探针 8-苯胺基-1-萘磺酸盐 (ANS-) 在 SR 膜中的分配取决于 PLB 的磷酸化水平。通过磷酸化可以获得高达 7 mV 的表面膜电位变化。 PLB 磷酸化诱导的 Ca 泵对 Ca2+ 的表观亲和力的增加在高离子强度下明显降低,即在已知降低表面膜电位和依赖于它的所有过程的条件下。结果表明,静电现象可以在很大程度上解释心脏 SR 中 PLB 对 Ca 泵的调节。
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.
具有改善的 Ca2+ 转运特性的犬心脏肌浆网的分离和表征。
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
β-肾上腺素能刺激心脏膜蛋白原位磷酸化的胆碱能拮抗作用。
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