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Use of magnetic circular dichroism to study dinuclear metallohydrolases and the corresponding biomimetics

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Abstract

Magnetic circular dichroism (MCD) is a convenient technique for providing structural and mechanistic insight into enzymatic systems in solution. The focus of this review is on aspects of geometric and electronic structure that can be determined by MCD, and how this method can further our understanding of enzymatic mechanisms. Dinuclear Co(II) systems that catalyse hydrolytic reactions were selected to illustrate the approach. These systems all contain active sites with similar structures consisting of two Co(II) ions bridged by one or two carboxylates and a water or hydroxide. In most of these active sites one Co(II) is five-coordinate and one is six-coordinate, with differing binding affinities. It is shown how MCD can be used to determine which binding site—five or six-coordinate—has the greater affinity. Importantly, zero-field-splitting data and magnetic exchange coupling constants may be determined from the temperature and field dependence of MCD data. The relevance of these data to the function of the enzymatic systems is discussed.

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Acknowledgments

J.A.L. wishes to acknowledge the National Science Foundation (USA) for financial support from grant CHE0848433 and grant CHE0820965 (MCD instrument). G.S. and N.M. acknowledge funding from the Australian Research Council (Future Fellowship) and the Science Foundation of Ireland (PIYRA Fellowship).

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Authors and Affiliations

  1. Department of Chemistry and Biochemistry, Middlebury College, Middlebury, VT, 05753, USA

    James A. Larrabee

  2. School of Chemistry and Molecular Biosciences, University of Queensland, Brisbane, QLD, 4072, Australia

    Gerhard Schenk & Mark J. Riley

  3. Department of Chemistry, Maynooth University, Maynooth, Co. Kildare, Ireland

    Nataša Mitić

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  1. James A. Larrabee
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  2. Gerhard Schenk
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  3. Nataša Mitić
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Correspondence to James A. Larrabee, Gerhard Schenk or Mark J. Riley.

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Larrabee, J.A., Schenk, G., Mitić, N. et al. Use of magnetic circular dichroism to study dinuclear metallohydrolases and the corresponding biomimetics. Eur Biophys J 44, 393–415 (2015). https://doi.org/10.1007/s00249-015-1053-6

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  • DOI: https://doi.org/10.1007/s00249-015-1053-6

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