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Updated: May 23, 2025
08:54
Bimolecular Fluorescence Complementation
Published on: April 15, 2011
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FKBP8, a new member of the PIK3C3/VPS34 complex
Milton Osmar Aguilera1,2,3, María Isabel Colombo1,2
1Consejo Nacional de Investigaciones Científicas y Tecnológicas (CONICET). Buenos Aires, Argentina.
Autophagy Reports
|May 21, 2025
Summary
FKBP8 is a newly identified protein that regulates starvation-activated autophagy. Its absence impairs autophagy, while its overexpression activates it, highlighting its crucial role in this cellular process.
Area of Science:
- Cell Biology
- Molecular Biology
Background:
- Autophagy is a vital cellular degradation pathway regulated by numerous proteins.
- Protein interactions are key to the specificity of autophagic events.
Purpose of the Study:
- To identify and characterize novel regulatory proteins involved in starvation-activated autophagy.
- To elucidate the mechanism by which FKBP8 regulates autophagy.
Main Methods:
- Investigated the role of FKBP8 in autophagy activation using cell-based assays.
- Examined the interaction of FKBP8 with the PIK3C3/VPS34 complex.
- Differentiated the function of FKBP8 domains in various autophagy contexts.
Main Results:
- FKBP8 was identified as a novel regulator of starvation-activated autophagy.
- FKBP8 absence impairs autophagy activation by serum starvation.
- FKBP8 overexpression activates autophagy in nutrient-rich conditions.
- FKBP8 regulates autophagy through interaction with the PIK3C3/VPS34 complex.
- The transmembrane domain of FKBP8, not the LIR domain, is crucial for its function in starvation-activated autophagy.
Conclusions:
- FKBP8 plays a critical role in the regulation of starvation-activated autophagy.
- FKBP8 interacts with the PIK3C3/VPS34 complex via its transmembrane domain to modulate autophagy.
- This contrasts with its previously known role in mitophagy, where the LIR domain is essential.
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