C. elegans SIR-2.1 interacts with 14-3-3 proteins to activate DAF-16 and extend life span

Ala Berdichevsky ¹, Mohan Viswanathan , H Robert Horvitz

⁰Howard Hughes Medical Institute, Massachusetts Institute of Technology, Cambridge, 02139, USA.

Cell +

|

June 17, 2006

View abstract on PubMed

Summary

Extra copies of the sir-2.1 gene extend lifespan in C. elegans by activating DAF-16. This process requires 14-3-3 proteins, particularly under stress conditions, acting independently of insulin signaling.

Area Of Science

Genetics
Molecular Biology
Aging Research

Background

The sir-2.1 gene and DAF-16 transcription factor are known to influence longevity in Caenorhabditis elegans.
Understanding the molecular mechanisms regulating lifespan is crucial for aging research.

Purpose Of The Study

To investigate the role of 14-3-3 proteins in SIR-2.1-mediated lifespan extension.
To elucidate the interaction between SIR-2.1, DAF-16, and 14-3-3 proteins under different signaling conditions.

Main Methods

Yeast three-hybrid screening to identify SIR-2.1 binding partners.
RNA interference (RNAi) to assess gene function in C. elegans.
Western blotting and immunoprecipitation to study protein interactions.
Lifespan assays and stress resistance tests.

Main Results

Two C. elegans 14-3-3 proteins were identified as binding partners of SIR-2.1.
14-3-3 genes are essential for the lifespan extension conferred by extra sir-2.1 copies.
SIR-2.1-induced DAF-16 transcriptional activation and stress resistance depend on 14-3-3 proteins.
SIR-2.1 binds DAF-16 in a 14-3-3-dependent manner following heat stress.
sir-2.1 and 14-3-3 genes are not required for lifespan regulation by insulin-like signaling.

Conclusions

A stress-dependent pathway involving SIR-2.1 and 14-3-3 proteins activates DAF-16 to extend lifespan.
This pathway acts in parallel to the insulin-like signaling pathway.
14-3-3 proteins are critical mediators of SIR-2.1 function in longevity and stress response.

Related Concept Videos