Catalytic Fields as a Tool to Analyze Enzyme Reaction Mechanism Variants and Reaction Steps

Area of Science:

• Biochemistry
• Computational Chemistry
• Enzyme Catalysis

Background:

• Traditional studies focus on enzyme electric fields acting on reactant bonds.
• A gap exists in understanding how catalytic fields affect enzyme residues.

Purpose of the Study:

• To investigate the role of catalytic fields in reducing activation barriers.
• To analyze the impact of charge redistribution on conserved amino acid residues.
• To compare catalytic mechanisms in histidyl tRNA synthetases.

Main Methods:

• A novel bottom-up computational approach using small reactant and transition-state models.
• Analysis of catalytic fields and charge redistribution.
• Application to 12 histidyl tRNA synthetases.

Main Results:

• Identified the critical role of the Glu83 conformation change in catalysis.
• Provided detailed insight into enzyme catalytic site electrostatic preorganization.
• Demonstrated low computational cost for detailed analysis.

Conclusions:

• The bottom-up approach offers a new perspective on enzyme-substrate interactions.
• Catalytic fields significantly influence conserved amino acid residues.
• Enables rational biocatalyst design with reduced computational expense.