Macrocycle
Macrocycle — A cyclic molecule with a ring of 12 or more atoms, including cyclic peptides designed for enhanced target binding and metabolic stability.
What Is a Macrocycle?
A macrocycle is a ring-shaped molecule containing 12 or more atoms in the ring. In peptide chemistry, macrocyclic peptides are created by cyclization strategies (head-to-tail, disulfide, lactam, staple, or triazole bridges). Macrocyclic peptides occupy a unique chemical space between small molecules and biologics, offering protein-like binding surfaces with drug-like membrane permeability.
Why Macrocycles
- Binding surface: 600-2000 Da macrocycles present larger binding surfaces than small molecules, enabling targeting of protein-protein interactions
- Conformational control: Ring constraint reduces entropic penalty of binding, improving affinity
- Membrane permeability: Intramolecular hydrogen bonds shield polar amides, enabling passive membrane crossing (cyclosporine model)
- Protease resistance: Cyclic backbone lacks free termini for exopeptidase attack
Frequently Asked Questions
What is Macrocycle?
A cyclic molecule with a ring of 12 or more atoms, including cyclic peptides designed for enhanced target binding and metabolic stability.
Why is Macrocycle important in peptide research?
Macrocycle is a fundamental concept in structure as it relates to peptide science. It directly influences experimental design, compound characterization, and the reliability of research outcomes across biochemistry and molecular biology disciplines.