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Bioorg Chem. 2012 Aug;43:44-50. doi: 10.1016/j.bioorg.2011.11.001. Epub 2011 Nov 17.

Cooperativity in monomeric enzymes with single ligand-binding sites.

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  • 1Department of Chemistry and Biochemistry, 217 Dittmer Laboratory, Florida State University, Tallahassee, FL 32306-4390, USA.

Abstract

Cooperativity is widespread in biology. It empowers a variety of regulatory mechanisms and impacts both the kinetic and thermodynamic properties of macromolecular systems. Traditionally, cooperativity is viewed as requiring the participation of multiple, spatially distinct binding sites that communicate via ligand-induced structural rearrangements; however, cooperativity requires neither multiple ligand binding events nor multimeric assemblies. An underappreciated manifestation of cooperativity has been observed in the non-Michaelis-Menten kinetic response of certain monomeric enzymes that possess only a single ligand-binding site. In this review, we present an overview of kinetic cooperativity in monomeric enzymes. We discuss the primary mechanisms postulated to give rise to monomeric cooperativity and highlight modern experimental methods that could offer new insights into the nature of this phenomenon. We conclude with an updated list of single subunit enzymes that are suspected of displaying cooperativity, and a discussion of the biological significance of this unique kinetic response.

Copyright © 2011 Elsevier Inc. All rights reserved.

PMID:
22137502
[PubMed - indexed for MEDLINE]
PMCID:
PMC3307832
Free PMC Article
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