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Identification of Protein Interaction Partners in Mammalian Cells Using SILAC-immunoprecipitation Quantitative Proteomics
Published on: July 6, 2014
Protein-protein interactions. Putting the pieces together
Current Biology : CB
|October 1, 1995
Abstract:
What do the recently determined crystal structures of 14-3-3 proteins and of a complex between part of the protein kinase Raf and the Ras-related protein Rap tell us about how 14-3-3 and Ras regulate the function of Raf?
Insights
Crystal structures reveal how 14-3-3 proteins and Ras-related proteins regulate Raf kinase function. These findings provide insights into the molecular mechanisms governing Raf signaling pathways.
Area of Science:
- Biochemistry
- Molecular Biology
- Structural Biology
Background:
- 14-3-3 proteins are crucial regulators of diverse cellular processes.
- Raf kinases are key components of signaling pathways, including the Ras-MAPK pathway.
- Dysregulation of Raf signaling is implicated in various diseases, particularly cancer.
Purpose of the Study:
- To elucidate the structural basis for 14-3-3 mediated regulation of Raf kinase.
- To understand the role of Ras-related proteins, such as Rap, in modulating Raf-14-3-3 interactions.
- To provide molecular insights into how these interactions control Raf activity and downstream signaling.
Main Methods:
- X-ray crystallography was used to determine the structures of 14-3-3 proteins.
- Crystal structure determination of a complex comprising Raf kinase and the Ras-related protein Rap.
- Structural analysis and comparison to infer functional mechanisms.
Main Results:
- The crystal structures reveal specific binding interfaces between 14-3-3 proteins and Raf kinase.
- The structures illustrate how Rap binding to Raf influences its conformation and interaction with 14-3-3.
- These interactions suggest a mechanism where 14-3-3 binding stabilizes an active or inactive conformation of Raf, modulated by Rap.
Conclusions:
- The determined structures provide a detailed molecular understanding of how 14-3-3 proteins regulate Raf kinase.
- Ras-related proteins like Rap play a role in modulating Raf's interaction with 14-3-3, thereby influencing Raf activity.
- These findings offer a structural framework for understanding Raf signaling and potential therapeutic targeting.
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