Metal Ion Transport by the Cation Diffusion Facilitator Family

阳离子扩散促进剂家族的金属离子传输

基本信息

  • 批准号:
    10319967
  • 负责人:
  • 金额:
    $ 43.42万
  • 依托单位:
  • 依托单位国家:
    美国
  • 项目类别:
  • 财政年份:
    2019
  • 资助国家:
    美国
  • 起止时间:
    2019-01-01 至 2022-12-31
  • 项目状态:
    已结题

项目摘要

ABSTRACT This project addresses fundamental mechanisms by which secondary transporters in the Cation Diffusion Facilitator (CDF) family carry transition metal ions such as Zn2+, Mn2+, Fe2+ and Co2+ across the membrane. These ions serve as cofactors for a diverse array of enzymes and regulatory proteins. The ions play a role in many different physiological processes and, as a result, CDF transporters are widespread. CDF transporters are involved both in uptake of ions, which are normally trace elements in the environment, and in export of ions, thus providing tolerance to extreme environments. We propose to combine structural, functional and computational studies to generate a detailed mechanistic understanding of the bacterial Zn2+ transporter YiiP and to extend this understanding to other branches of the family represented by specific bacterial and eukaryotic homologs displaying different in ion selectivities and having unique structural domains. Aim 1 will focus on defining conformational changes in YiiP that characterize the alternating access mechanism, a paradigm for the transport of substrates across biological membranes. For this first aim, we will use cryo-EM to characterize the structure of the outward-facing state as well as Zn2+-free states of YiiP in a lipid environment. We will also use Molecular Dynamics to characterize the dynamics of conformational changes between these states as well as the energetics of the transport cycle. Aim 2 will investigate functional determinants of transport. In particular, we will study energy coupling of YiiP using in vitro transport assays to characterize the coupling of Zn2+ transport to the proton motive force, will explore potential roles of Zn2+ binding sites in the cytoplasmic domain as either structural elements stabilizing the homodimer or as functional elements that regulate activity, and will characterize cooperativity between the two molecules that compose the dimer. In Aim 3, we will expand our studies on YiiP to related CDF family members from a diverse array of organisms, thus sampling all three branches of the family tree. We have identified from previous publications a number of bacterial and eukaryotic homologs have been heterologously expressed in either E. coli or S. cerevisiae and used for cell-based assays. We will screen these homologs for high expression levels and stability and use the best behaved to explore the basis for ion selectivity, to compare mechanisms of energy coupling, and to evaluate the functional role of histidine-rich loops. These loops have been postulated to bind metal ions, suggesting potential roles in regulation or activation of transport.
摘要 本项目涉及的基本机制,其中二级转运蛋白在阳离子 扩散促进剂(CDF)家族携带过渡金属离子,例如Zn 2+、Mn 2+、Fe 2+和Co 2 + 穿过细胞膜这些离子作为多种酶的辅因子, 调节蛋白离子在许多不同的生理过程中发挥作用, 因此,CDF转运蛋白分布广泛。CDF转运蛋白参与离子的摄取, 通常是环境中的痕量元素,并在离子输出中,因此提供 对极端环境的耐受性。我们建议将联合收割机结构、功能和 计算研究,以产生对细菌Zn2+的详细机制理解 转运蛋白YiiP,并将这种理解扩展到家族的其他分支, 特定的细菌和真核同源物,其显示不同的离子选择性,并具有 独特的结构域。目标1将集中于定义YiiP中的构象变化, 表征交替存取机制,用于基板的运输的范例 穿过生物膜对于第一个目标,我们将使用冷冻EM来表征 在脂质环境中,YiiP的外向状态以及无Zn 2+状态的结构。 我们还将使用分子动力学来表征构象变化的动力学 以及运输循环的能量学。目标2将调查 运输的功能决定因素。特别是,我们将研究YiP在 体外转运测定以表征Zn 2+转运与质子动力的偶联, 将探讨锌2+结合位点在细胞质结构域的潜在作用, 稳定同二聚体的元件或作为调节活性的功能元件,并且将 表征组成二聚体的两个分子之间的协同性。在目标3中,我们 将我们对YiiP的研究扩展到来自各种生物体的相关CDF家族成员, 从而对家谱的所有三个分支进行采样。我们已经从之前的 许多细菌和真核生物的同源物已经被异源地 表达于E. coli或S.并用于基于细胞的测定。我们将筛选这些 为同源物的高表达量和稳定性以及使用性能最佳化探索依据 对于离子选择性,比较能量耦合的机制,并评估功能 富含组氨酸的环的作用。这些环被假定为结合金属离子,这表明 调节或激活运输的潜在作用。

项目成果

期刊论文数量(0)
专著数量(0)
科研奖励数量(0)
会议论文数量(0)
专利数量(0)

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David L. Stokes其他文献

Why conserving species in the wild still matters
  • DOI:
    10.1007/s10531-018-1509-y
  • 发表时间:
    2018-02-05
  • 期刊:
  • 影响因子:
    3.100
  • 作者:
    David L. Stokes
  • 通讯作者:
    David L. Stokes
Structure of the Calcium Pump from Sarcoplasmic Reticulum at 8 Å Resolution: Architecture of the Transmembrane Helices and Localization of the Binding Site for Thapsigargin
8 Å 分辨率下肌浆网钙泵的结构:跨膜螺旋的结构和毒胡萝卜素结合位点的定位
  • DOI:
  • 发表时间:
    1998
  • 期刊:
  • 影响因子:
    2.8
  • 作者:
    Peijun Zhang;Chikashi Toyoshima;K. Yonekura;G. Inesi;M. Green;David L. Stokes
  • 通讯作者:
    David L. Stokes
Zinc-Induced Conformational Changes in the Cation Diffusion Facilitator YiiP
  • DOI:
    10.1016/j.bpj.2019.11.2468
  • 发表时间:
    2020-02-07
  • 期刊:
  • 影响因子:
  • 作者:
    Maria L. Lopez;Akiko Koide;Lorena Novoa;Jose M Arguello;Shohei Koide;David L. Stokes
  • 通讯作者:
    David L. Stokes
Mechanism of K<sup>+</sup> transport along the intersubunit tunnel of kdpFABC
  • DOI:
    10.1016/j.bpj.2022.11.2809
  • 发表时间:
    2023-02-10
  • 期刊:
  • 影响因子:
  • 作者:
    Hridya Valia Madapally;David L. Stokes;Himanshu Khandelia
  • 通讯作者:
    Himanshu Khandelia
Three-dimensional crystals of CaATPase from sarcoplasmic reticulum. Symmetry and molecular packing.
来自肌浆网的 CaATPase 三维晶体。
  • DOI:
  • 发表时间:
    1990
  • 期刊:
  • 影响因子:
    3.4
  • 作者:
    David L. Stokes;N. Green
  • 通讯作者:
    N. Green

David L. Stokes的其他文献

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{{ truncateString('David L. Stokes', 18)}}的其他基金

Molecular Mechanisms of Ion Transport - Equipment supplement
离子传输的分子机制 - 设备补充
  • 批准号:
    10798994
  • 财政年份:
    2022
  • 资助金额:
    $ 43.42万
  • 项目类别:
Molecular Mechanisms of Ion Transport
离子传输的分子机制
  • 批准号:
    10330684
  • 财政年份:
    2022
  • 资助金额:
    $ 43.42万
  • 项目类别:
Molecular Mechanisms of Ion Transport
离子传输的分子机制
  • 批准号:
    10600000
  • 财政年份:
    2022
  • 资助金额:
    $ 43.42万
  • 项目类别:
Metal Ion Transport by the Cation Diffusion Facilitator Family
阳离子扩散促进剂家族的金属离子传输
  • 批准号:
    10083216
  • 财政年份:
    2019
  • 资助金额:
    $ 43.42万
  • 项目类别:
Metal Ion Transport by the Cation Diffusion Facilitator Family
阳离子扩散促进剂家族的金属离子传输
  • 批准号:
    10592636
  • 财政年份:
    2019
  • 资助金额:
    $ 43.42万
  • 项目类别:
Potassium transport by the KdpFABC complex
KdpFABC 复合体的钾转运
  • 批准号:
    10225328
  • 财政年份:
    2014
  • 资助金额:
    $ 43.42万
  • 项目类别:
Potassium transport by the KdpFABC complex
KdpFABC 复合体的钾转运
  • 批准号:
    9982340
  • 财政年份:
    2014
  • 资助金额:
    $ 43.42万
  • 项目类别:
Structural Studies of P-Type ATPases
P 型 ATP 酶的结构研究
  • 批准号:
    8712800
  • 财政年份:
    2014
  • 资助金额:
    $ 43.42万
  • 项目类别:
High-throughput Pipeline for Electron Crystallography
电子晶体学高通量管道
  • 批准号:
    8313999
  • 财政年份:
    2010
  • 资助金额:
    $ 43.42万
  • 项目类别:
TRAINING PROGRAM IN MACROMOLECULAR STRUCTURE AND MECHANISM
大分子结构与机理培训项目
  • 批准号:
    8291301
  • 财政年份:
    2010
  • 资助金额:
    $ 43.42万
  • 项目类别:
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