National Institutes of Health/National Institute of Mental Health (NIH/NIMH)
米国
引用
ジャーナル: Sci Adv / 年: 2021 タイトル: Illumination of serotonin transporter mechanism and role of the allosteric site. 著者: Dongxue Yang / Eric Gouaux / 要旨: The serotonin transporter (SERT) terminates serotonin signaling by using sodium and chloride gradients to drive reuptake of serotonin into presynaptic neurons and is the target of widely used ...The serotonin transporter (SERT) terminates serotonin signaling by using sodium and chloride gradients to drive reuptake of serotonin into presynaptic neurons and is the target of widely used medications to treat neuropsychiatric disorders. Despite decades of study, the molecular mechanism of serotonin transport, the coupling to ion gradients, and the role of the allosteric site have remained elusive. Here, we present cryo–electron microscopy structures of SERT in serotonin-bound and serotonin-free states, in the presence of sodium or potassium, resolving all fundamental states of the transport cycle. From the SERT-serotonin complex, we localize the substrate-bound allosteric site, formed by an aromatic pocket positioned in the scaffold domain in the extracellular vestibule, connected to the central site via a short tunnel. Together with elucidation of multiple apo state conformations, we provide previously unseen structural understanding of allosteric modulation, demonstrating how SERT binds serotonin from synaptic volumes and promotes unbinding into the presynaptic neurons.
履歴
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2021年1月26日
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2021年12月15日
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2021年12月15日
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2021年12月15日
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2021年12月15日
Data content type: Additional map / Data content type: Additional map / Provider: repository / タイプ: Initial release
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2021年12月15日
Data content type: Image / Data content type: Image / Provider: repository / タイプ: Initial release
改定 1.0
2021年12月15日
Data content type: Primary map / Data content type: Primary map / Provider: repository / タイプ: Initial release
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A: Sodium-dependent serotonin transporter B: variable domain of 15B8 antibody Fab heavy chain C: variable domain of 15B8 antibody Fab light chain ヘテロ分子