Ion Binding Sites and their Representations by Quasichemical Reduced Models

Details Ion Binding Sites and their Representations by Quasichemical Reduced Models Ion Binding Sites and their Representations by Quasichemical Reduced Models

2012-02-22

arxiv.org/abs/1202.4939v1

Biology

Quantitative Biology

Biomolecules

Scientific paper

The binding of small metal ions to complex macromolecular structures is typically dominated by strong local interactions of the ion with its nearest ligands. For this reason, it is often possible to understand the microscopic origin of ion binding selectivity by considering simplified reduced models comprised of only the nearest ion-coordinating ligands. Although the main ingredients underlying simplified reduced models are intuitively clear, a formal statistical mechanical treatment is nonetheless necessary in order to draw meaningful conclusions about complex macromolecular systems. By construction, reduced models only treat the ion and the nearest coordinating ligands explicitly. The influence of the missing atoms from the protein or the solvent is incorporated indirectly. Quasi-chemical theory offers one example of how to carry out such a separation in the case of ion solvation in bulk liquids, and in several ways, a statistical mechanical formulation of reduced binding site models for macromolecules is expected to follow a similar route. Here, some critical issues with recent theories of reduced binding site models are examined.

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