The Electronic Structure of Genome Editors from the First Principles

Area of Science:

• Biochemistry
• Computational Biology
• Molecular Biophysics

Background:

• CRISPR-Cas9 gene editing technology has revolutionized multiple scientific fields.
• Understanding the precise enzymatic mechanisms of Cas9 is crucial for its advancement.

Purpose of the Study:

• To elucidate the role of first-principles (ab-initio) molecular dynamics (MD) in advancing CRISPR-Cas9 technology.
• To provide profound insights into the enzymatic function and guide enzyme engineering for improved genome editing tools.

Main Methods:

• Utilized ab-initio MD simulations to characterize the two-metal dependent DNA cleavage mechanism in the Cas9 RuvC domain.
• Employed free-energy methods (thermodynamic integration, metadynamics) combined with ab-initio MD to map chemical landscapes and catalytic mechanisms.
• Incorporated constant pH MD simulations to determine catalytic residue protonation states.

Main Results:

• Detailed characterization of the dual-metal dependent DNA cleavage by the RuvC domain and single-metal ion assistance in the HNH domain.
• Established the catalytic mechanism of CRISPR-Cas9 by analyzing the electronic structure and chemical landscape.
• Accurate prediction of catalytic residue protonation states using classical MD methods.

Conclusions:

• First-principles methods offer unprecedented understanding of CRISPR-Cas9's electronic structure and catalytic activity.
• These computational insights are invaluable for designing next-generation genome editing tools with enhanced efficiency and control.