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Protein-protein interactions in receptor activation and intracellular signalling
T L Blundell1, D F Burke, D Chirgadze
1Department of Biochemistry, University of Cambridge, UK.
Biological Chemistry
|November 15, 2000
Summary
Structural studies reveal insights into cell signaling complexes, including growth factors and intracellular proteins. The strength of molecular interactions is not solely determined by surface area, with conformational changes playing a key role.
Area of Science:
- Structural biology
- Molecular signaling
- Biochemistry
Background:
- Cellular signaling relies on intricate protein-protein interactions.
- Understanding these complexes is crucial for deciphering biological processes.
Purpose of the Study:
- To review X-ray crystallography-defined signaling complexes.
- To analyze the relationship between buried surface area and interaction strength.
- To highlight the role of conformational changes in molecular recognition.
Main Methods:
- X-ray crystallography for structural determination.
- Analysis of protein-protein interaction interfaces.
- Comparison of diverse signaling complexes.
Main Results:
- Structures of growth factor-receptor complexes (NGF, HGF/SF, FGF1/FGFR2) and intracellular complexes (phosducin, CK2, Cdk6/p19INK4d) were analyzed.
- Buried surface area is not always a reliable predictor of interaction strength.
- Conformational changes are critical for interactions with intermediate buried surface areas (1500-2000 Ų), such as Cdk6-INK4.
Conclusions:
- Signaling complex formation involves diverse mechanisms, including induced fit.
- Structural insights are vital for understanding signal transduction pathways.
- The dynamics of protein interactions are as important as their interfaces.