6PER image
Entry Detail
PDB ID:
6PER
Title:
Crystal Structure of Ligand-Free iSeroSnFR
Biological Source:
PDB Version:
Deposition Date:
2019-06-20
Release Date:
2020-06-24
Method Details:
Experimental Method:
Resolution:
2.10 Å
R-Value Free:
0.23
R-Value Work:
0.18
R-Value Observed:
0.19
Space Group:
I 2 2 2
Macromolecular Entities
Polymer Type:polypeptide(L)
Description:iSeroSnFR, a soluble, genetically-encoded fluorescent sensor for serotonin
Chain IDs:A
Chain Length:557
Number of Molecules:1
Biological Source:Thermoanaerobacter sp. X513
Ligand Molecules
Primary Citation

Abstact

Serotonin plays a central role in cognition and is the target of most pharmaceuticals for psychiatric disorders. Existing drugs have limited efficacy; creation of improved versions will require better understanding of serotonergic circuitry, which has been hampered by our inability to monitor serotonin release and transport with high spatial and temporal resolution. We developed and applied a binding-pocket redesign strategy, guided by machine learning, to create a high-performance, soluble, fluorescent serotonin sensor (iSeroSnFR), enabling optical detection of millisecond-scale serotonin transients. We demonstrate that iSeroSnFR can be used to detect serotonin release in freely behaving mice during fear conditioning, social interaction, and sleep/wake transitions. We also developed a robust assay of serotonin transporter function and modulation by drugs. We expect that both machine-learning-guided binding-pocket redesign and iSeroSnFR will have broad utility for the development of other sensors and in vitro and in vivo serotonin detection, respectively.

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