Formation of chiral morphologies through selective binding of amino acids to calcite surface steps

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ID: 119029
1970
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Abstract
Many living organisms contain biominerals and composites with finely tuned properties, reflecting a remarkable level of control over the nucleation, growth and shape of the constituent crystals1,2,3,4,5,6. Peptides and proteins play an important role in achieving this control1,7,8. But the general view that organic molecules affect mineralization through stereochemical recognition, where geometrical and chemical constraints dictate their binding to a mineral, seems difficult to reconcile4 with a mechanistic understanding, where crystallization is controlled by thermodynamic and kinetic factors9. Indeed, traditional crystal growth models emphasize the inhibiting effect of so-called ‘modifiers’ on surface-step growth, rather than stereochemical matching to newly expressed crystal facets. Here we report in situ atomic force microscope observations and molecular modelling studies of calcite growth in the presence of chiral amino acids that reconcile these two seemingly divergent views. We find that enantiomer-specific binding of the amino acids to those surface-step edges that offer the best geometric and chemical fit changes the step-edge free energies, which in turn results in macroscopic crystal shape modifications. Our results emphasize that the mechanism underlying crystal modification through organic molecules is best understood by considering both stereochemical recognition and the effects of binding on the interfacial energies of the growing crystal.
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orme1970natureformation Use this key to autocite in the manuscript while using SciMatic Manuscript Manager or Thesis Manager
Authors C.A. Orme;A. Noy;A. Wierzbicki;M. T. McBride;M. Grantham;H.H. Teng;P.M. Dove;J.J. DeYoreo;C.A. Orme;A. Noy;A. Wierzbicki;M. T. McBride;M. Grantham;H.H. Teng;P.M. Dove;J.J. DeYoreo;
Journal Nature
Year 1970
DOI
doi:10.1038/35081034
URL
https://dx.doi.org/10.1038/35081034
Keywords
Science humanities and social sciences multidisciplinary

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