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Updated: Jun 28, 2026
Structure and Coordination Determination of Peptide-metal Complexes Using 1D and 2D 1H NMR
Published on: December 16, 2013
Using diastereopeptides to control metal ion coordination in proteins
Anna F A Peacock1, Lars Hemmingsen, Vincent L Pecoraro
1Department of Chemistry, University of Michigan, Ann Arbor, MI 48109-1055, USA.
Researchers developed a novel method using D-amino acids to control metal ion coordination geometry in biomolecules. This approach enables precise manipulation of metal binding pockets, leading to selective metal binding based on coordination number.
Area of Science:
- Biochemistry
- Bioinorganic Chemistry
- Peptide Design
Background:
- Controlling metal ion coordination in biomolecules is crucial for understanding their function.
- Amino acid side chain orientation significantly impacts metal binding pocket sterics.
Purpose of the Study:
- To introduce a new strategy for controlling metal ion coordination geometry in biomolecules.
- To demonstrate the ability to design de novo metallopeptides with specific metal binding properties.
Main Methods:
- Substitution of L-amino acids with D-amino acids to reorient side chains.
- Design and synthesis of de novo metallopeptides.
- Characterization using (113)Cd NMR and (111m)Cd PAC spectroscopy.
Main Results:
- Successfully designed a metallopeptide with exclusively trigonal CdS(3) coordination.
- Demonstrated that coordination number, not ligating group, dictates metal binding properties like high pKa.
- Engineered a construct capable of selectively binding Cd(II) to specific sites based on coordination number control.
Conclusions:
- The L- to D-amino acid substitution strategy effectively controls metal ion coordination geometry.
- Coordination number is a key determinant of metal binding site properties.
- This method allows for the design of proteins with metal-binding selectivity based on coordination number.
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