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Updated: May 22, 2025

Spatiotemporal Control of Protein Activity through Optogenetic Allosteric Regulation

Spatiotemporal Control of Protein Activity through Optogenetic Allosteric Regulation

Published on: October 4, 2024

Lipid-driven Src self-association modulates its transformation capacity.

Irrem-Laareb Mohammad¹, Marina I Giannotti^2,3,4, Elise Fourgous^5,6

¹https://ror.org/021018s57 Biomolecular NMR Laboratory, Department of Inorganic and Organic Chemistry, Universitat de Barcelona (UB), Barcelona, Spain.

Life Science Alliance

|March 13, 2025

Summary

This summary is machine-generated.

Membrane lipids regulate Src tyrosine kinase self-association through a lysine cluster in its SH4 region, impacting cell growth and cancer. This lipid-mediated mechanism may extend to other signaling proteins.

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Area of Science:

Biochemistry
Cell Biology
Molecular Oncology

Background:

Src tyrosine kinase is crucial for cell growth and adhesion, with deregulation linked to cancer.
While Src associates with the plasma membrane, the influence of membrane lipids on its regulation is not well understood.

Purpose of the Study:

To investigate the role of membrane lipids in regulating Src tyrosine kinase activity and self-association.
To elucidate the structural basis and functional consequences of lipid-mediated Src self-association.

Main Methods:

In vitro and in vivo assays using human cells to study Src self-association.
Site-directed mutagenesis of the lysine cluster in the Src SH4 region.
Formation of protein-lipid condensates using supported lipid bilayers and purified Src domains.

Main Results:

Src self-associates via a lipid-mediated lysine cluster in its SH4 region.
Mutating the lysine cluster affects Src self-association and its transforming potential in human cells.
Full-length Src and its N-terminal regulatory element form micron-sized, lipid-anchored condensates, while the isolated SH4 domain forms smaller clusters.

Conclusions:

Lipid-mediated kinase self-association is a novel regulatory mechanism for Src tyrosine kinase.
This mechanism, involving lysine clusters and membrane lipids, may be relevant for other membrane-associated signaling proteins.