Cyclic Peptide Synthesis and Metal Ion Interactions

Cyclic peptides, in which the N- and C-termini or side chains are covalently linked to form a ring, have emerged as versatile scaffolds for applications ranging from drug design to materials science. Synthesis strategies include solution-phase macrocyclisation, solid-phase peptide synthesis with orthogonal protecting groups and chemoenzymatic routes exploiting peptide ligases. Key challenges involve controlling ring size, stereochemistry and functionalisation without epimerisation or oligomer formation. Metal ions play a dual role: they can template cyclisation by coordinating to specific residues, thereby preorganising linear precursors, and endow the resulting macrocycles with enhanced stability, redox activity or catalytic function. Metal-binding sites often incorporate heterocycles such as oxazole or thiazole rings, imidazole side chains and carbonyl oxygen donors, creating well-defined coordination geometry. Interactions with alkali, alkaline earth and transition metals underpin uses in ion sensing, nanocarrier design and selective extraction. Advances in computational modelling and spectroscopic characterisation have deepened understanding of metal-peptide binding energies, coordination modes and conformational dynamics in solution and within porous host materials. Combining synthetic innovation with metal-templated assembly continues to expand the repertoire of cyclic peptides as functional supramolecular constructs.

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Cyclic Peptide Synthesis and Metal Ion Interactions publication trend

The graph below shows the total number of articles in cyclic peptide synthesis and metal ion interactions across all publications each year (not limited to Nature Index journals).

Technical terms

Solid-phase peptide synthesis: A stepwise method in which amino acids are sequentially coupled to a resin-bound peptide chain, allowing iterative deprotection and coupling cycles to build linear precursors before cyclisation.

Macrocyclisation: The intramolecular reaction that links the termini or side chains of a linear peptide to form a ring, often requiring dilute conditions or metal templates to suppress polymerisation.

Metal templation: The use of a metal ion to coordinate to specific donor atoms in a peptide precursor, organising its conformation to favour cyclisation and guiding ring closure.

Binding energy: The calculated or measured free-energy change associated with complex formation between a peptide and an ion, reflecting the stability of the metal-peptide assembly.

References

1. Bistratamides M and N, Oxazole-Thiazole Containing Cyclic Hexapeptides Isolated from Lissoclinum bistratum Interaction of Zinc (II) with Bistratamide K. Marine Drugs (2017).
2. Theoretical Study on Cyclopeptides as the Nanocarriers for Li+, Na+, K+ and F−, Cl−, Br−. Journal of Nanomaterials (2015).