A Computational Protocol for Regulating Protein Binding Reactions with a Light-Sensitive Protein Dimer.

Area of Science:

• Molecular Biology
• Optogenetics
• Biochemistry

Background:

• Light-sensitive proteins offer precise spatiotemporal control over cellular signaling networks.
• The Z-lock system utilizes a light-sensitive heterodimer to reversibly block protein binding surfaces.

Purpose of the Study:

• To develop and validate a computational protocol for designing optimal linkers for the Z-lock system.
• To enable the optogenetic control of diverse protein interactions using the Z-lock system.

Main Methods:

• Utilized the Rosetta molecular modeling program to design and test linkers.
• Engineered linkers to ensure proper heterodimer formation over specific protein binding surfaces.
• Tested the protocol on three different light-sensitive switches, including a novel switch for Cdc42.

Main Results:

• The developed protocol successfully predicted effective linker sets for Z-lock switches.
• Demonstrated the ability to design a new Z-lock switch for controlling the Rho-family GTPase Cdc42.
• Validated the generalized applicability of the computational approach for Z-lock system design.

Conclusions:

• The Rosetta-based protocol provides a generalized computational strategy for designing Z-lock linkers.
• This approach facilitates the optogenetic control of a wide range of proteins.
• Enables precise manipulation of protein binding and cellular signaling pathways via light activation.