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Published on: December 13, 2013
Src regulates sequence-dependent beta-2 adrenergic receptor recycling via cortactin phosphorylation
Rachel Vistein1, Manojkumar A Puthenveedu
1Department of Biological Sciences, The Center for the Neural Basis of Cognition, Carnegie Mellon University, MI202, 4400 Fifth Avenue, Pittsburgh, PA, 15213, USA.
Signaling receptors like the beta-2 adrenergic receptor (B2AR) use specialized pathways for recycling. This process is controlled by Src kinases targeting cortactin, regulating receptor delivery to the cell surface.
Area of Science:
- Cell biology
- Molecular signaling
- Biochemistry
Background:
- Internalized signaling receptors recycle via specialized pathways, unlike bulk protein recycling.
- The mechanisms controlling this selective recycling remain largely unknown.
- Understanding receptor recycling is crucial for cellular communication.
Purpose of the Study:
- To investigate the mechanisms regulating signaling receptor recycling.
- To identify key proteins and pathways involved in the selective recycling of beta-2 adrenergic receptor (B2AR).
- To elucidate how heterologous signaling controls receptor recycling.
Main Methods:
- Live-cell imaging assays to visualize receptor recycling.
- Biochemical assays to study protein interactions and modifications.
- Genetic manipulation to assess the role of specific proteins like Src family kinases and cortactin.
Main Results:
- Src family kinases regulate the recycling of B2AR.
- Cortactin is a key target of Src, essential for B2AR sorting into endosomal microdomains.
- Phosphorylation of cortactin at Y466 controls the rate of B2AR vesicle fission and cell surface delivery.
Conclusions:
- Specialized recycling pathways enable selective control of signaling receptor recycling via heterologous signaling.
- Actin-stabilized microdomains act as convergence points for signaling pathway crosstalk.
- Cortactin phosphorylation by Src kinases is a critical regulatory step in B2AR recycling.
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