Enhancing Metal-binding with Noncanonical Coordinating Amino Acids

Area of Science:

• Biochemistry
• Bioinorganic Chemistry
• Synthetic Biology

Background:

• Proteins and peptides commonly bind metal ions via canonical amino acid side chains.
• Post-translational modifications and noncanonical amino acids significantly expand metal-binding capabilities.

Purpose of the Study:

• To review natural and artificial systems utilizing noncanonical amino acids for metal ion coordination.
• To highlight novel or enhanced functions achieved through these modified systems.

Main Methods:

• Summarization of diverse examples including disease-related proteins, natural metallophores, and synthetic constructs.
• Analysis of systems employing sulfurylation, phosphorylation, and other modifications.

Main Results:

• Noncanonical amino acids enable unique metal-binding properties not achievable with canonical residues alone.
• Examples span from disease protein modifications to selective ion capture and biocatalysis.

Conclusions:

• Modified peptides and proteins with noncanonical amino acids offer versatile and enhanced metal coordination.
• These systems present novel avenues for applications in medicine, biotechnology, and environmental remediation.