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P66(ShcA) interacts with MAPKAP kinase 2 and regulates its activity.
Yvonne M Yannoni1, Matthias Gaestel, Lih-Ling Lin
1Department of Inflammation, Wyeth Research, 200 Cambridge Park Drive, Cambridge, MA 02140-2311, USA. yvonne.yannoni@abbott.com
FEBS Letters
|April 20, 2004
Summary
Researchers identified three new proteins interacting with mitogen-activated protein kinase-activated protein kinase 2 (MK2). These include ShcA, HPH2, and HSTS, with ShcA playing a role in MK2 activation.
Area of Science:
- Molecular Biology
- Cell Signaling
Background:
- Mitogen-activated protein kinase-activated protein kinase 2 (MK2) is a key regulator in cellular signaling pathways.
- Understanding MK2 interacting proteins is crucial for elucidating its diverse cellular functions.
Purpose of the Study:
- To identify novel protein interactors of MK2.
- To investigate the functional relationship between MK2 and its interacting partners, particularly p66(ShcA).
Main Methods:
- Yeast two-hybrid screening was employed to identify potential MK2 interacting proteins.
- Co-immunoprecipitation assays were used to confirm the interactions in vitro.
- In vitro kinase assays were performed to assess MK2 activity in the presence of interacting proteins.
Main Results:
- Three novel MK2 interacting proteins were identified: ShcA, human polyhomeotic 2 (HPH2), and highly similar to smoothelin (HSTS).
- The interactions between MK2 and p66(ShcA) (the 66 kDa isoform of ShcA) and HPH2 were validated via co-immunoprecipitation.
- Co-expression of p66(ShcA) led to MK2 activation, and p66(ShcA) was found to be an in vitro substrate for MK2.
Conclusions:
- ShcA, HPH2, and HSTS are novel interacting partners of MK2.
- p66(ShcA) is involved in the activation of MK2, suggesting a role in MK2-mediated signaling pathways.