Structural transition in Bcl-xL and its potential association with mitochondrial calcium ion transport.

Structural transition in Bcl-xL and its potential association with mitochondrial calcium ion transport.
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DOI:
10.1038/srep10609
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发表时间:
2015-05-29
期刊:
影响因子:
4.6
通讯作者:
Yoon HS
Yoon HS
中科院分区:
综合性期刊3区
文献类型:
--
作者:
Rajan S;Choi M;Nguyen QT;Ye H;Liu W;Toh HT;Kang C;Kamariah N;Li C;Huang H;White C;Baek K;Grüber G;Yoon HS

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Bcl-2家族蛋白是响应凋亡刺激的细胞内稳态的关键调节剂。Bcl-xL是抗凋亡Bcl-2家族成员,其经历构象转变,这导致两种构象状态:细胞质和膜结合。在这里,我们提出的晶体和小角X射线散射(SAXS)结构的Bcl-xL处理的温和洗涤剂正辛基β-D-麦芽糖苷(OM)。经洗涤剂处理的Bcl-xL通过交换两个单体之间的螺旋α6-α8的三维结构域交换(3DDS)形成二聚体。与Bcl-2家族的促凋亡成员Bax不同,Bcl-xL在结合BH 3肽和ABT-737(一种BH 3模拟药物)后不转化为3DDS同型二聚体。我们还设计了不能二聚化的Bcl-xL突变体,并表明这些突变体降低了MEF细胞中线粒体钙的摄取。这说明了Bcl-xL的结构可塑性,为Bcl-xL在线粒体钙离子转运中发挥调节作用的可能分子机制提供了线索。
Bcl-2 family proteins are key regulators for cellular homeostasis in response to apoptotic stimuli. Bcl-xL, an antiapoptotic Bcl-2 family member, undergoes conformational transitions, which leads to two conformational states: the cytoplasmic and membrane-bound. Here we present the crystal and small-angle X-ray scattering (SAXS) structures of Bcl-xL treated with the mild detergent n-Octyl β-D-Maltoside (OM). The detergent-treated Bcl-xL forms a dimer through three-dimensional domain swapping (3DDS) by swapping helices α6-α8 between two monomers. Unlike Bax, a proapoptotic member of the Bcl-2 family, Bcl-xL is not converted to 3DDS homodimer upon binding BH3 peptides and ABT-737, a BH3 mimetic drug. We also designed Bcl-xL mutants which cannot dimerize and show that these mutants reduced mitochondrial calcium uptake in MEF cells. This illustrates the structural plasticity in Bcl-xL providing hints toward the probable molecular mechanism for Bcl-xL to play a regulatory role in mitochondrial calcium ion transport.
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