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Default Enzyme Active Site Interactions by Raman/FTIR, NMR, and Ab Initio Calculations.

Enzyme Active Site Interactions by Raman/FTIR, NMR, and Ab Initio Calculations.

Related Articles Enzyme Active Site Interactions by Raman/FTIR, NMR, and Ab Initio Calculations.

Adv Protein Chem Struct Biol. 2013;93:153-82

Authors: Deng H

Abstract
Characterization of enzyme active site structure and interactions at high resolution is important for the understanding of the enzyme catalysis. Vibrational frequency and NMR chemical shift measurements of enzyme-bound ligands are often used for such purpose when X-ray structures are not available or when higher resolution active site structures are desired. This review is focused on how ab initio calculations may be integrated with vibrational and NMR chemical shift measurements to quantitatively determine high-resolution ligand structures (up to 0.001Å for bond length and 0.01Å for hydrogen bonding distance) and how interaction energies between bound ligand and its surroundings at the active site may be determined. Quantitative characterization of substrate ionic states, bond polarizations, tautomeric forms, conformational changes and its interactions with surroundings in enzyme complexes that mimic ground state or transition state can provide snapshots for visualizing the substrate structural evolution along enzyme-catalyzed reaction pathway. Our results have shown that the integration of spectroscopic studies with theoretical computation greatly enhances our ability to interpret experimental data and significantly increases the reliability of the theoretical analysis.


PMID: 24018325 [PubMed - in process]



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