Conformational selection or induced fit? 50 years of debate resolved.

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TitleConformational selection or induced fit? 50 years of debate resolved.
Publication TypeJournal Article
Year of Publication2011
AuthorsChangeux, J-P, Edelstein, S
JournalF1000 Biol Rep
Date Published2011

<p>Exactly 50 years ago, biochemists raised the question of the mechanism of the conformational change that mediates "allosteric" interactions between regulatory sites and biologically active sites in regulatory/receptor proteins. Do the different conformations involved already exist spontaneously in the absence of the regulatory ligands (Monod-Wyman-Changeux), such that the complementary protein conformation would be selected to mediate signal transduction, or do particular ligands induce the receptor to adopt the conformation best suited to them (Koshland-Nemethy-Filmer-induced fit)? This is not just a central question for biophysics, it also has enormous importance for drug design. Recent advances in techniques have allowed detailed experimental and theoretical comparisons with the formal models of both scenarios. Also, it has been shown that mutated receptors can adopt constitutively active confirmations in the absence of ligand. There have also been demonstrations that the atomic resolution structures of the same protein are essentially the same whether ligand is bound or not. These and other advances in past decades have produced a situation where the vast majority of the data using different categories of regulatory proteins (including regulatory enzymes, ligand-gated ion channels, G protein-coupled receptors, and nuclear receptors) support the conformational selection scheme of signal transduction.</p>

Alternate JournalF1000 Biol Rep
PubMed ID21941598
PubMed Central IDPMC3169905