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The Serotonin Receptor Subtype 5b Specifically Interacts with Serotonin Receptor Subtype 1A.


ABSTRACT: Previously, we described the dysregulation of serotonin (5-HT) receptor subtype 5b (5-ht5b) in a mouse model of Rett syndrome (RTT). 5-ht5b has not been extensively studied, so we set out to characterize it in more detail. Unlike common cell surface receptors, 5-ht5b displays no membrane expression, while receptor clusters are located in endosomes. This unusual subcellular localization is at least in part controlled by glycosylation of the N-terminus, with 5-ht5b possessing fewer glycosylation sites than related receptors. We analyzed whether the localization to endosomes has any functional relevance and found that 5-ht5b receptors can specifically interact with 5-HT1A receptors and retain them in endosomal compartments. This interaction reduces 5-HT1A surface expression and is mediated by interactions between the fourth and fifth trans-membrane domain (TMD). This possibly represents a mechanism by which 5-ht5b receptors regulate the activity of other 5-HT receptor.

SUBMITTER: Niebert S 

PROVIDER: S-EPMC5613149 | biostudies-literature | 2017

REPOSITORIES: biostudies-literature

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The Serotonin Receptor Subtype 5b Specifically Interacts with Serotonin Receptor Subtype 1A.

Niebert Sabine S   van Belle Gijsbert J GJ   Vogelgesang Steffen S   Manzke Till T   Niebert Marcus M  

Frontiers in molecular neuroscience 20170921


Previously, we described the dysregulation of serotonin (5-HT) receptor subtype 5b (5-ht<sub>5b</sub>) in a mouse model of Rett syndrome (RTT). 5-ht<sub>5b</sub> has not been extensively studied, so we set out to characterize it in more detail. Unlike common cell surface receptors, 5-ht<sub>5b</sub> displays no membrane expression, while receptor clusters are located in endosomes. This unusual subcellular localization is at least in part controlled by glycosylation of the N-terminus, with 5-ht<s  ...[more]

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