Universal allosteric mechanism for Gα activation by GPCRs
- Tilman Flock 1, Charles N J Ravarani 1, Dawei Sun 2,3, A J Venkatakrishnan 1, Melis Kayikci 1, Christopher G Tate 1, Dmitry B Veprintsev 2,3, M Madan Babu 1
- Tilman Flock 1, Charles N J Ravarani 1, Dawei Sun 2,3
- 1MRC Laboratory of Molecular Biology, Francis Crick Avenue, Cambridge CB2 0QH, UK.
- 2Laboratory of Biomolecular Research, Paul Scherrer Institut, Villigen, Switzerland.
- 3Department of Biology, ETH Zurich, Zurich, Switzerland.
- 0MRC Laboratory of Molecular Biology, Francis Crick Avenue, Cambridge CB2 0QH, UK.
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View abstract on PubMed
Summary
This summary is machine-generated.G protein-coupled receptors (GPCRs) activate G proteins via a conserved allosteric mechanism. This conserved G protein activation mechanism allowed for rapid diversification of GPCRs while maintaining signaling specificity.
Area Of Science
- Molecular Biology
- Biochemistry
- Structural Biology
Background
- G protein-coupled receptors (GPCRs) are crucial cell surface receptors involved in numerous physiological processes.
- GPCRs activate heterotrimeric G proteins, initiating intracellular signaling cascades.
- The diversity of GPCRs (∼800 human genes) and Gα proteins (16 genes) raises questions about the universality of their activation mechanisms.
Purpose Of The Study
- To investigate whether a universal allosteric mechanism governs the activation of Gα proteins by diverse GPCRs.
- To understand the structural basis for conserved Gα activation within the context of GPCR signaling.
- To explore the evolutionary implications of conserved Gα activation and receptor-specific binding.
Main Methods
- Comparative structural analysis of Gα proteins and small GTPases like Ras.
- Analysis of protein segments undergoing disorder-to-order transitions.
- In silico modeling and biochemical assays (implied).
Main Results
- A highly conserved allosteric mechanism underlies the interaction and activation of Gα proteins by different GPCRs.
- Evolution of short, intrinsically disordered segments in Gα proteins allows decoupling of allosteric activation from receptor binding specificity.
- This mechanism explains the rapid diversification of the GPCR-Gα system while preserving core activation principles.
Conclusions
- The GPCR-Gα signaling system utilizes a conserved allosteric mechanism for G protein activation.
- Evolutionary adaptations in Gα protein structure, particularly disorder-to-order transitions, facilitate both conserved activation and specific receptor interactions.
- This conserved mechanism is key to understanding the vast signaling capacity and evolutionary success of the GPCR superfamily.
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