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Oligomerization of serotonin transporter and its functional consequences
1Department of Pharmacology, Yale University School of Medicine, 333 Cedar Street, P.O. Box 208066, New Haven, CT 06520-8066, USA.
Summary
Two forms of serotonin transporter (SERT) associate, suggesting a dimeric structure. Functional interactions between subunits indicate SERT may form higher-order complexes, possibly tetramers.
Area of Science:
- Neuroscience
- Molecular Biology
- Biochemistry
Background:
- The serotonin transporter (SERT) plays a crucial role in regulating serotonergic neurotransmission.
- Understanding the oligomeric state and subunit interactions of SERT is essential for elucidating its function and regulation.
Purpose of the Study:
- To investigate the oligomeric state and subunit interactions of the serotonin transporter (SERT).
- To determine if SERT exists as dimers or higher-order complexes and explore functional implications.
Main Methods:
- Co-expression of FLAG-tagged (Res-FLAG) and c-myc-tagged (Sens-myc) SERT forms in HeLa cells.
- Immunoprecipitation using anti-c-myc antibodies and streptavidin precipitation after biotinylation.
- Chemical modification of a reactive cysteine residue (Cys172) on Sens-myc to assess functional interactions.
Main Results:
- Res-FLAG was co-precipitated with Sens-myc, indicating association between SERT subunits.
- A reactive cysteine at position 172 in Sens-myc was accessible on the cell surface and involved in functional interactions.
- Inactivation of Sens-myc by chemical reagents was reduced when co-expressed with Res-FLAG, suggesting subunit interaction protects functional sites.
Conclusions:
- The findings support a dimeric model for SERT, with functional interactions between subunits.
- Evidence suggests SERT dimers may associate into higher-order complexes, potentially tetramers.
- These oligomeric structures likely play a role in SERT function and regulation.