Electric Fields and Enzyme Catalysis

Annu Rev Biochem. 2017 Jun 20;86:387-415. doi: 10.1146/annurev-biochem-061516-044432. Epub 2017 Mar 24.

Abstract

What happens inside an enzyme's active site to allow slow and difficult chemical reactions to occur so rapidly? This question has occupied biochemists' attention for a long time. Computer models of increasing sophistication have predicted an important role for electrostatic interactions in enzymatic reactions, yet this hypothesis has proved vexingly difficult to test experimentally. Recent experiments utilizing the vibrational Stark effect make it possible to measure the electric field a substrate molecule experiences when bound inside its enzyme's active site. These experiments have provided compelling evidence supporting a major electrostatic contribution to enzymatic catalysis. Here, we review these results and develop a simple model for electrostatic catalysis that enables us to incorporate disparate concepts introduced by many investigators to describe how enzymes work into a more unified framework stressing the importance of electric fields at the active site.

Keywords: electric fields; enzyme electrostatics; infrared spectroscopy; preorganization; protein biophysics; vibrational Stark effect.

Publication types

  • Review
  • Research Support, N.I.H., Extramural
  • Research Support, U.S. Gov't, Non-P.H.S.
  • Research Support, Non-U.S. Gov't

MeSH terms

  • Bacterial Proteins / chemistry*
  • Bacterial Proteins / genetics
  • Bacterial Proteins / metabolism
  • Biocatalysis
  • Catalytic Domain
  • Gene Expression
  • Hydrolases / chemistry*
  • Hydrolases / genetics
  • Hydrolases / metabolism
  • Ketosteroids / chemistry*
  • Ketosteroids / metabolism
  • Kinetics
  • Models, Chemical
  • Molecular Dynamics Simulation
  • Mutation
  • Pseudomonas / chemistry
  • Pseudomonas / enzymology*
  • Pseudomonas / genetics
  • Spectrophotometry, Infrared / methods
  • Static Electricity
  • Steroid Isomerases / chemistry*
  • Steroid Isomerases / genetics
  • Steroid Isomerases / metabolism
  • Thermodynamics

Substances

  • Bacterial Proteins
  • Ketosteroids
  • Hydrolases
  • 4-chlorobenzoyl coenzyme A dehalogenase
  • Steroid Isomerases