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I.资助的奖学金R 01 GM 140584摘要 这项提议旨在了解位于细胞膜上的蛋白质如何作为守门人工作， 选择性地允许化合物进出细胞。这种看门人被称为ATP结合盒（ABC） 转运蛋白，因为它们使用ATP（三磷酸腺苷）水解的能量来转运化合物 穿过细胞膜细菌ABC输入者对于生物体的存活至关重要，控制着细菌的生长速率。 从细菌环境中清除的营养物质的吸收。对运输速度的控制防止了过度- 低浓度有益但高浓度可能有毒的营养素的积累。 虽然ABC蛋白的一个子集含有一个额外的“辅助”结构域，可以调节细胞对 通过关闭转运蛋白来合成化合物，目前还不清楚为什么某些转运蛋白含有这些结构域， 其他人则没有。然而，我们知道，当特定的化合物被释放时，某些转运蛋白会被“关闭”。 或蛋白质结合到该辅助结构域。其他附属结构域通过“感知”细胞内的变化来调节。 微环境，并做出相应的反应。为了破译这种调节机制，PI的实验室 结合生物化学和生物物理实验与结构生物学，以了解这些附属物如何 结构域在限制或允许营养物质进入细胞的运输调节中发挥作用。本研究 该计划将定义控制营养吸收的分子机制，并允许研究人员了解 多个运输系统如何在有机体内协同工作以维持细胞存活。我们将测试我们的 假设通过传感辅助蛋白调节转运蛋白激活。拟议的研究将 在一个模型系统中破译复杂的调节回路，有三个目的：（1）了解PepT SBPs如何 选择微环境中的不同基质（即，营养素、辅因子和肽）;（2）确定 核心转运蛋白的组装如何决定转运选择性和效率（3）揭示PepT如何 转运蛋白通过激活新的调节结构域来调节底物进入细胞。 这项研究计划已着手缩小在运输的基本原理的理解的关键差距 存在于所有细菌中。这些结果将有助于深入了解调控域如何调节运输 对细胞活力至关重要。 资助父母奖没有变化

I. SUMMARY OF THE FUNDED PARENT AWARD R01 GM140584 This proposal seeks to understand how proteins located in the cell membrane work as gatekeepers to selectively allow compounds into or out of the cell. Such gatekeepers are known as ATP-binding cassette (ABC) transporters because they use the energy of ATP (adenosine triphosphate) hydrolysis to transport compounds across the cell membrane. Bacterial ABC importers are essential for organism survival, controlling the rate of uptake for nutrients scavenged from the bacterium's environment. Control of the rate of transport precludes over- accumulation of a nutrient that is beneficial at low concentrations but is potentially toxic at high concentrations. While a subset of ABC proteins contain an additional “accessory” domain that can regulate the uptake of compounds by shutting off the transporter, it is unclear why certain transporters contain these domains while others do not. However, we do understand that certain transporters are “turned off” when a specific compound or protein binds to this accessory domain. Other accessory domains regulate by “sensing” changes in the microenvironment and reacting accordingly. To decipher this mechanism of regulation, the PI's laboratory combines biochemical and biophysical experiments with structural biology to understand how these accessory domains play a role in transport regulation, which in restricts or allows nutrients to enter the cell. This research program will define the molecular mechanism that controls nutrient uptake and allow researchers to understand how multiple transport systems work in concert within an organism to maintain cell survival. We will test our hypothesis that regulation of transporter activation via a sensing accessory protein. The proposed research will decipher the complex circuitry of regulation in a model system in three Aims to: (1) understand how PepT SBPs select for different substrates within the microenvironment (i.e., nutrients, cofactors, and peptides); (2) determine how the assembly of the core transporter dictates transport selectivity and efficiency (3) reveal how PepT transporters regulate the import of substrates into the cell through the activation of a novel regulatory domain. This research program has set out to close critical gaps in the understanding of the fundamentals of the transport mechanism present in all bacteria. The results will yield insights into how regulatory domains modulate transport across all organisms, crucial for cell viability. There are no changes to the funded parent award