Distinct conformational spectrum of homologous multidrug ABC transporters.

Distinct conformational spectrum of homologous multidrug ABC transporters.
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DOI:
10.1016/j.str.2014.12.013
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发表时间:
2015-03-03
期刊:
影响因子:
5.7
通讯作者:
Zhang, Qinghai
Zhang, Qinghai
中科院分区:
生物学2区
文献类型:
--
作者:
Moeller, Arne;Lee, Sung Chang;Tao, Houchao;Speir, Jeffrey A.;Chang, Geoffrey;Urbatsch, Ina L.;Potter, Clinton S.;Carragher, Bridget;Zhang, Qinghai

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ATP结合盒(ABC)输出蛋白广泛存在于生命的各个领域,其成员在介导药物药代动力学和临床多药耐药方面发挥着重要作用。关于它们在X射线结构中观察到的构象的相关性,它们的结构动力学和运输机制,仍然存在重大的问题和争议。在这里,我们使用单粒子电子显微镜(EM)描绘的两个同源ABC出口商(细菌MsbA和哺乳动物P-糖蛋白)和核苷酸和底物结合的影响的整个构象谱。新开发的两亲物与脂质复合,支持高蛋白质稳定性和活性,使EM可视化的膜模拟环境中的单个复合物。这些数据提供了这些ABC出口商在不同状态下的构象灵活性的全面视图,并且不仅展示了它们对构象变化的机械和能量调节之间的相似之处,而且还展示了显着差异。
ATP-binding cassette (ABC) exporters are ubiquitously found in all kingdoms of life and their members play significant roles in mediating drug pharmacokinetics and multidrug resistance in the clinic. Significant questions and controversies remain regarding the relevance of their conformations observed in X-ray structures, their structural dynamics, and mechanism of transport. Here we used single particle electron microscopy (EM) to delineate the entire conformational spectrum of two homologous ABC exporters (bacterial MsbA and mammalian P-glycoprotein) and the influence of nucleotide and substrate binding. Newly developed amphiphiles in complex with lipids that support high protein stability and activity enabled EM visualization of individual complexes in a membrane-mimicking environment. The data provide a comprehensive view of the conformational flexibility of these ABC exporters under various states and demonstrate not only similarities but striking differences between their mechanistic and energetic regulation of conformational changes.
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