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Positive allostery in metal ion binding by a cooperatively folded β-peptide bundle.

  • Author(s): Miller, Jonathan
  • Melicher, Michael
  • Schepartz, Alanna
  • et al.

Published Web Location

https://doi.org/10.1021/ja508872q
Abstract

Metal ion binding is exploited by proteins in nature to catalyze reactions, bind molecules, and favor discrete structures, but it has not been demonstrated in β-peptides or their assemblies. Here we report the design, synthesis, and characterization of a β-peptide bundle that uniquely binds two Cd(II) ions in a distinct bicoordinate array. The two Cd(II) ions bind with positive allosteric cooperativity and increase the thermodynamic stability of the bundle by more than 50 °C. This system provides a unique, synthetic context to explore allosteric regulation and should pave the way to sophisticated molecular assemblies with catalytic and substrate-sensing functions that have historically not been available to de novo designed synthetic proteomimetics in water.

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