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    Entropy-enthalpy compensation may be a useful interpretation tool for complex systems like protein-DNA complexes: An appeal to experimentalists

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    Type
    Article
    Authors
    Starikov, E. B.
    Nordén, B.
    Date
    2012-05-12
    Online Publication Date
    2012-05-12
    Print Publication Date
    2012-05-07
    Permanent link to this record
    http://hdl.handle.net/10754/598203
    
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    Abstract
    In various chemical systems, enthalpy-entropy compensation (EEC) is a well-known rule of behavior, although the physical roots of it are still not completely understood. It has been frequently questioned whether EEC is a truly physical phenomenon or a coincidence due to trivial mathematical connections between statistical-mechanical parameters-or even simpler: A phantom effect resulting from the misinterpretation of experimental data. Here, we review EEC from another standpoint using the notion of correlation, which is essential for the method of factor analysis but is not conventional in physics and chemistry. We conclude that the EEC may be rationalized in terms of hidden (not directly measurable with the help of the current experimental set-up) but physically real factors, implying a Carnot-cycle model in which a micro-phase transition (MPT) plays a crucial role. Examples of such MPTs underlying physically valid EEC should be typically cooperative processes in supramolecular aggregates, like changes of structured water at hydrophobic surfaces, conformational transitions upon ligand-biopolymer binding, and so on. The MPT notion could help rationalize the occurrence of EEC in connection with hydration and folding of proteins, enzymatic reactions, functioning of molecular motors, DNA de- and rehybridization, as well as similar phenomena. © 2012 American Institute of Physics.
    Citation
    Starikov EB, Nordén B (2012) Entropy-enthalpy compensation may be a useful interpretation tool for complex systems like protein-DNA complexes: An appeal to experimentalists. Applied Physics Letters 100: 193701. Available: http://dx.doi.org/10.1063/1.4714726.
    Sponsors
    B.N. would like to acknowledge financial support from King Abdullah University of Science and Technology (KAUST).
    Publisher
    AIP Publishing
    Journal
    Applied Physics Letters
    DOI
    10.1063/1.4714726
    ae974a485f413a2113503eed53cd6c53
    10.1063/1.4714726
    Scopus Count
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