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14-3-3 and its possible role in co-ordinating multiple signalling pathways
1Laboratory of Protein Structure, National Institute for Medical Research, Mill Hill, London, UK NW7 1AA.
Trends in Cell Biology
|September 1, 1996
Summary
14-3-3 proteins act as novel chaperone proteins, regulating signal-transduction pathways. Phosphorylation is key to their function, and a new motif in Raf proteins identifies a 14-3-3 binding site.
Area of Science:
- Molecular Biology
- Cell Signaling
- Protein Interactions
Background:
- 14-3-3 proteins are crucial for biological activities, acting as homo- and heterodimers.
- Their precise role was previously unclear but they are now recognized as chaperone proteins.
- These proteins modulate interactions within signal-transduction pathways.
Purpose of the Study:
- To investigate the role of phosphorylation in regulating 14-3-3 protein interactions.
- To identify novel sequence motifs involved in 14-3-3 binding.
Main Methods:
- Analysis of major phosphorylation sites in Raf proteins.
- Identification and characterization of a novel sequence motif.
Main Results:
- Phosphorylation of binding partners and 14-3-3 proteins is critical for interaction regulation.
- A novel conserved sequence motif, R(S)X(1,2)S(P)X(P), was identified in Raf.
- This motif represents a potential interaction site for 14-3-3-binding proteins.
Conclusions:
- 14-3-3 proteins function as critical regulators in signal transduction.
- Phosphorylation plays a vital role in modulating these protein interactions.
- The identified Raf motif provides insight into conserved 14-3-3 binding mechanisms.