Mechanisms of Allostery and Molecular Recognition in the Small Multidrug Resistan

描述（由申请方提供）：本提案的目的是表征小多药耐药（SMR）蛋白家族内的变构和药物识别机制。对抗生素的多药耐药（MDR）是细菌对多种化学上不同的分子同时产生耐药性的能力。虽然已经成功地开发和修饰了几种具有不同化学支架的新抗生素，但MDR仍然是医院和诊所中普遍存在的问题。我们将揭示原子水平上的变构控制机制和分子相互作用，使SMR蛋白能够识别多种药物。这些分子马达需要能量依赖的构象转变和蛋白质-蛋白质大分子组装来执行功能。我们的高分辨率结构生物学方法将采用NMR光谱来揭示分子水平的细节。虽然生物化学和生物物理学研究为这项研究奠定了基础，但这些蛋白质识别药物、被激活并随后产生耐药性的分子机制尚不清楚。我们的研究将提供结构动力学-功能相关性，以深入了解这一重大的人类健康问题，并从SMR家族的角度揭示MDR现象的分子图像，该图像可应用于其他家族，以更好地了解临床耐药性。

DESCRIPTION (provided by applicant): The goal of this proposal is to characterize the mechanisms of allostery and drug recognition within the small multidrug resistance (SMR) protein family. Multidrug resistance (MDR) to antibiotics is the ability of bacteria to confer simultaneous resistance to a wide variety of chemically distinct molecules. While several new antibiotics exhibiting different chemical scaffolds have been successfully developed and modified, MDR remains a pervasive problem in hospitals and clinics. We will reveal the allosteric control mechanism and molecular interactions at the atomic level that enable SMR proteins to recognize a wide variety of drugs. These molecular motors require energy dependent conformational transitions and protein-protein macromolecular assemblies to carry out function. Our high-resolution structural biology approach will employ NMR spectroscopy to reveal the details at the molecular level. While biochemical and biophysical studies have laid the foundation for this research, the molecular mechanism by which these proteins recognize drugs, become activated, and subsequently confer resistance is unknown. Our studies will provide a structural dynamics-function correlation for providing insight into this significant human health problem, and in doing so will reveal a molecular picture of the MDR phenomenon from the standpoint of the SMR family that can be applied to other families in order to better understand clinical resistance.