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Analyzing Melts and Fluids from Ab Initio Molecular Dynamics Simulations with the UMD Package

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Serine proteases: an ab initio molecular dynamics study.

L De Santis¹, P Carloni

¹Istituto Nazionale di Fisica della Materia, International School for Advanced Studies, Trieste, Italy.

|January 29, 2000

Summary

This summary is machine-generated.

Serine proteases utilize key hydrogen bonds for function. Our study reveals His57-Asp102 forms a low-barrier H-bond, while Gly193 stabilizes intermediates via charge interactions, not H-bonding.

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Area of Science:

Biochemistry
Computational Chemistry
Enzymology

Background:

Serine proteases (SPs) are critical enzymes with conserved catalytic residues.
Hydrogen bonds, particularly between His57-Asp102 and Gly193 with the transition state, are vital for SP enzymatic function.
The precise nature of these interactions, especially Gly193's role, requires further elucidation.

Purpose of the Study:

To investigate the nature of crucial hydrogen bonds in serine proteases.
To clarify the interaction mechanism between Gly193 and the transition state intermediate.
To compare computational findings with experimental data for enzyme-transition state complexes.

Main Methods:

Performed ab initio molecular dynamics simulations.
Simulated complexes of the reaction intermediate with elastase.
Modeled substrate-enzyme adducts for comparative analysis.

Main Results:

Confirmed a low-barrier hydrogen bond between His57 and Asp102, consistent with NMR data.
Demonstrated that Gly193 stabilizes the intermediate through charge/dipole interactions, not hydrogen bonding.
Found that the protein's electric field has a negligible impact on charge distribution.

Conclusions:

The His57-Asp102 interaction in serine proteases is a low-barrier hydrogen bond.
Gly193 stabilizes the transition state intermediate via electrostatic forces, revising previous hypotheses.
Computational simulations provide valuable insights into enzyme catalytic mechanisms.