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Rewiring kinase specificity with a synthetic adaptor protein
Elissa M Hobert1, Alanna Schepartz
1Department of Chemistry, Yale University, New Haven, Connecticut 06520-8107, USA.
Journal of the American Chemical Society
|February 23, 2012
Summary
Synthetic adaptor proteins, built from miniature proteins, can redirect cellular signaling pathways. This study demonstrates a novel adaptor that directs tyrosine phosphorylation of a p53 regulator by a specific kinase.
Area of Science:
- Biochemistry
- Molecular Biology
- Synthetic Biology
Background:
- Protein interactions are crucial for managing cellular signaling cascades in time and space.
- Adaptor proteins facilitate these interactions by bringing enzymes and substrates together.
- Miniature proteins are small, engineered protein domains with specific binding capabilities.
Purpose of the Study:
- To engineer a synthetic adaptor protein using miniature proteins to redirect tyrosine phosphorylation.
- To investigate the ability of this synthetic adaptor to control signaling events involving the Src family kinase Hck.
Main Methods:
- Utilized two miniature proteins with complementary binding properties to construct a synthetic adaptor protein.
- Employed the synthetic adaptor to redirect the Hck kinase to phosphorylate hDM2.
- Analyzed the phosphorylation event, including turnover and site specificity.
Main Results:
- A miniature-protein-based adaptor (adaptor 3) was successfully created.
- Adaptor 3 effectively redirected the Src family kinase Hck to phosphorylate hDM2, a negative regulator of p53.
- The phosphorylation event demonstrated multiple turnover and occurred at a specific site.
Conclusions:
- Miniature proteins can be assembled into synthetic adaptors to control protein signaling.
- This approach offers a novel method for redirecting enzymatic activity, such as tyrosine phosphorylation.
- The engineered adaptor shows potential for precise manipulation of cellular signaling pathways.
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