Conformational dynamics of the human serotonin transporter during substrate and drug binding.

Abstract:

:The serotonin transporter (SERT), a member of the neurotransmitter:sodium symporter family, is responsible for termination of serotonergic signaling by re-uptake of serotonin (5-HT) into the presynaptic neuron. Its key role in synaptic transmission makes it a major drug target, e.g. for the treatment of depression, anxiety and post-traumatic stress. Here, we apply hydrogen-deuterium exchange mass spectrometry to probe the conformational dynamics of human SERT in the absence and presence of known substrates and targeted drugs. Our results reveal significant changes in dynamics in regions TM1, EL3, EL4, and TM12 upon binding co-transported ions (Na+/K+) and ligand-mediated changes in TM1, EL3 and EL4 upon binding 5-HT, the drugs S-citalopram, cocaine and ibogaine. Our results provide a comprehensive direct view of the conformational response of SERT upon binding both biologically relevant substrate/ions and ligands of pharmaceutical interest, thus advancing our understanding of the structure-function relationship in SERT.

journal_name

Nat Commun

journal_title

Nature communications

authors

Möller IR,Slivacka M,Nielsen AK,Rasmussen SGF,Gether U,Loland CJ,Rand KD

doi

10.1038/s41467-019-09675-z

subject

Has Abstract

pub_date

2019-04-11 00:00:00

pages

1687

issue

1

issn

2041-1723

pii

10.1038/s41467-019-09675-z

journal_volume

10

pub_type

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