Protein structure. Crystal structures of translocator protein (TSPO) and mutant mimic of a human polymorphism.

Protein structure. Crystal structures of translocator protein (TSPO) and mutant mimic of a human polymorphism.
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DOI:
10.1126/science.1260590
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发表时间:
2015-01-30
期刊:
Science (New York, N.Y.)
影响因子:
--
通讯作者:
Ferguson-Miller S
Ferguson-Miller S
中科院分区:
其他
文献类型:
--
作者:
Li F;Liu J;Zheng Y;Garavito RM;Ferguson-Miller S

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18千道尔顿转运蛋白(TSPO)被认为是胆固醇转运到线粒体中的关键分子,在类固醇生成组织、转移性癌症以及炎症和神经系统疾病(如阿尔茨海默氏症和帕金森氏症)中高度表达。TSPO配体,包括苯二氮卓类药物,涉及调节细胞凋亡,并广泛用于诊断成像。我们报告了来自球形红细菌的TSPO的晶体结构(分辨率为1.8、2.4和2.5埃)以及一种模拟与精神疾病和孕烯醇酮产生减少相关的人类Ala 147 → Thr 147多态性的突变体。晶体中获得的立方相揭示了内源性卟啉配体的结合位点和突变的构象效应。这三种晶体结构显示出相同的紧密相互作用的二聚体,并提供了对TSPO有争议的生理作用以及突变如何影响胆固醇结合的见解。
The 18-kilodalton translocator protein (TSPO), proposed to be a key player in cholesterol transport into mitochondria, is highly expressed in steroidogenic tissues, metastatic cancer, and inflammatory and neurological diseases such as Alzheimer’s and Parkinson’s. TSPO ligands, including benzodiazepine drugs, are implicated in regulating apoptosis and are extensively used in diagnostic imaging. We report crystal structures (at 1.8, 2.4, and 2.5 angstrom resolution) of TSPO from Rhodobacter sphaeroides and a mutant that mimics the human Ala147→Thr147 polymorphism associated with psychiatric disorders and reduced pregnenolone production. Crystals obtained in the lipidic cubic phase reveal the binding site of an endogenous porphyrin ligand and conformational effects of the mutation. The three crystal structures show the same tightly interacting dimer and provide insights into the controversial physiological role of TSPO and how the mutation affects cholesterol binding.
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