Structural basis for activation of plasma-membrane Ca2+-ATPase by calmodulin

Structural basis for activation of plasma-membrane Ca2+-ATPase by calmodulin
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钙调蛋白激活质膜 Ca2-ATP 酶的结构基础

DOI:
10.1038/s42003-018-0203-7
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发表时间:
2018
影响因子:
5.9
通讯作者:
Uetrecht
Uetrecht
中科院分区:
生物学2区
文献类型:
--
作者:
Nitsche;Heidemann;Mertens;Moulin;Haertlein;Forsyth;Svergun;Uetrecht

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质膜Ca~(2+)-ATPase将Ca~(2+)从细胞质中排出,是真核生物中Ca~(2+)稳态的关键调节因子。在低钙离子浓度下,它们被自动抑制。钙调蛋白(CaM)-结合到一个独特的调节域,释放自身抑制并激活泵。然而,这种激活的结构基础,包括这种钙泵的整体结构及其与钙调蛋白的复合体,尚不清楚。我们先前确定了钙调素与质膜Ca~(2+)-ATPase ACA8调节域的复合体的高分辨结构,并揭示了真核生物中钙调控的双模式机制。在这里,我们证明了CaM激活ACA8涉及到很大的构象变化。结合对从隐形纳米盘和自然质谱学获得的中子散射数据的高级建模和对结合常数的详细剖析,我们提出了一个全长ACA8钙泵的结构模型,该模型说明了调节结构域从核心酶移位的过程。
Plasma-membrane Ca2+-ATPases expel Ca2+from the cytoplasm and are key regulators of Ca2+homeostasis in eukaryotes. They are autoinhibited under low Ca2+concentrations. Calmodulin (CaM)-binding to a unique regulatory domain releases the autoinhibition and activates the pump. However, the structural basis for this activation, including the overall structure of this calcium pump and its complex with calmodulin, is unknown. We previously determined the high-resolution structure of calmodulin in complex with the regulatory domain of the plasma-membrane Ca2+-ATPase ACA8 and revealed a bimodular mechanism of calcium control in eukaryotes. Here we show that activation of ACA8 by CaM involves large conformational changes. Combining advanced modeling of neutron scattering data acquired from stealth nanodiscs and native mass spectrometry with detailed dissection of binding constants, we present a structural model for the full-length ACA8 Ca2+pump in its calmodulin-activated state illustrating a displacement of the regulatory domain from the core enzyme.
DOI: 10.1074/jbc.m109.006148
发表时间: 2009-11-06
影响因子: 4.8
作者:
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通讯作者: De Michelis, Maria Ida
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发表时间: 1988-01-01
影响因子: 2.9
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