Hydrogen tunneling and protein motion in enzyme reactions

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217 Scopus citations


Theoretical perspectives on hydrogen transfer reactions in enzymes are presented. The proton-coupled electron transfer reaction catalyzed by soybean lipoxygenase and the hydride transfer reaction catalyzed by dihydrofolate reductase are discussed. The first reaction is nonadiabatic and involves two distinct electronic states, while the second reaction is predominantly adiabatic and occurs on the electronic ground state. Theoretical studies indicate that hydrogen tunneling and protein motion play significant roles in both reactions. In both cases, the proton donor-acceptor distance decreases relative to its equilibrium value to enable efficient hydrogen tunneling. Equilibrium thermal motions of the protein lead to conformational changes that facilitate hydrogen transfer, but the nonequilibrium dynamical aspects of these motions have negligible impact.

Original languageEnglish (US)
Pages (from-to)93-100
Number of pages8
JournalAccounts of chemical research
Issue number2
StatePublished - Feb 2006
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • General Chemistry


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