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    Nanion技术: 离子通道研究的智能工具

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    SyncroPatch 384i: HTS Automated Patch Clamp

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    SURFE²R 96SE: 非标记高通量转运体筛选

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  • 脂双层记录: Orbit产品系列

    脂双层记录: Orbit产品系列

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SyncroPatch 384

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Orbit Mini

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Vesicle Prep Pro

2014 - Substrate-bound outward-open state of the betaine transporter BetP provides insights into Na+ coupling

Icon N1  SURFE²R-technology (custom-built system) publication in Nature Communications (2014)

Authors:
Perez C., Faust B., Mehdipour A.R., Francesconi K.A., Forrest L.R., Ziegler C.

Journal:
Nature Communications (2014) 5:4231 doi: 10.1038/ncomms5231


Abstract:

The Na+-coupled betaine symporter BetP shares a highly conserved fold with other sequence unrelated secondary transporters, for example, with neurotransmitter symporters. Recently, we obtained atomic structures of BetP in distinct conformational states, which elucidated parts of its alternating-access mechanism. Here, we report a structure of BetP in a new outward-open state in complex with an anomalous scattering substrate, adding a fundamental piece to an unprecedented set of structural snapshots for a secondary transporter. In combination with molecular dynamics simulations these structural data highlight important features of the sequential formation of the substrate and sodium-binding sites, in which coordinating water molecules play a crucial role. We observe a strictly interdependent binding of betaine and sodium ions during the coupling process. All three sites undergo progressive reshaping and dehydration during the alternating-access cycle, with the most optimal coordination of all substrates found in the closed state.


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