5i6z

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X-ray structure of the ts2 human serotonin transporter

Structural highlights

5i6z is a 3 chain structure with sequence from Homo sapiens and Mus musculus. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance.
Method:X-ray diffraction, Resolution 4.53Å
Ligands:NAG
Resources:FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT

Function

SC6A4_HUMAN Serotonin transporter whose primary function in the central nervous system involves the regulation of serotonergic signaling via transport of serotonin molecules from the synaptic cleft back into the pre-synaptic terminal for re-utilization. Plays a key role in mediating regulation of the availability of serotonin to other receptors of serotonergic systems. Terminates the action of serotonin and recycles it in a sodium-dependent manner.[1] [2] [3]

Publication Abstract from PubMed

The serotonin transporter (SERT) terminates serotonergic signalling through the sodium- and chloride-dependent reuptake of neurotransmitter into presynaptic neurons. SERT is a target for antidepressant and psychostimulant drugs, which block reuptake and prolong neurotransmitter signalling. Here we report X-ray crystallographic structures of human SERT at 3.15 A resolution bound to the antidepressants (S)-citalopram or paroxetine. Antidepressants lock SERT in an outward-open conformation by lodging in the central binding site, located between transmembrane helices 1, 3, 6, 8 and 10, directly blocking serotonin binding. We further identify the location of an allosteric site in the complex as residing at the periphery of the extracellular vestibule, interposed between extracellular loops 4 and 6 and transmembrane helices 1, 6, 10 and 11. Occupancy of the allosteric site sterically hinders ligand unbinding from the central site, providing an explanation for the action of (S)-citalopram as an allosteric ligand. These structures define the mechanism of antidepressant action in SERT, and provide blueprints for future drug design.

X-ray structures and mechanism of the human serotonin transporter.,Coleman JA, Green EM, Gouaux E Nature. 2016 Apr 21;532(7599):334-9. doi: 10.1038/nature17629. Epub 2016 Apr 6. PMID:27049939[4]

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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See Also

References

  1. ↑ Brenner B, Harney JT, Ahmed BA, Jeffus BC, Unal R, Mehta JL, Kilic F. Plasma serotonin levels and the platelet serotonin transporter. J Neurochem. 2007 Jul;102(1):206-15. Epub 2007 May 15. PMID:17506858 doi:http://dx.doi.org/10.1111/j.1471-4159.2007.04542.x
  2. ↑ Ahmed BA, Jeffus BC, Bukhari SI, Harney JT, Unal R, Lupashin VV, van der Sluijs P, Kilic F. Serotonin transamidates Rab4 and facilitates its binding to the C terminus of serotonin transporter. J Biol Chem. 2008 Apr 4;283(14):9388-98. doi: 10.1074/jbc.M706367200. Epub 2008, Jan 28. PMID:18227069 doi:http://dx.doi.org/10.1074/jbc.M706367200
  3. ↑ Ahmed BA, Bukhari IA, Jeffus BC, Harney JT, Thyparambil S, Ziu E, Fraer M, Rusch NJ, Zimniak P, Lupashin V, Tang D, Kilic F. The cellular distribution of serotonin transporter is impeded on serotonin-altered vimentin network. PLoS One. 2009;4(3):e4730. doi: 10.1371/journal.pone.0004730. Epub 2009 Mar 9. PMID:19270731 doi:http://dx.doi.org/10.1371/journal.pone.0004730
  4. ↑ Coleman JA, Green EM, Gouaux E. X-ray structures and mechanism of the human serotonin transporter. Nature. 2016 Apr 21;532(7599):334-9. doi: 10.1038/nature17629. Epub 2016 Apr 6. PMID:27049939 doi:http://dx.doi.org/10.1038/nature17629

Contents


PDB ID 5i6z

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OCA

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