Cyclization
The process of forming a ring structure within a peptide chain, typically through disulfide bonds or amide bonds between the N- and C-termini. Cyclization increases stability, receptor selectivity, and resistance to enzymatic degradation.
Frequently Asked Questions
What is Cyclization?
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Related Terms
A covalent bond formed between two cysteine residues in a peptide chain. Disulfide bonds stabilize three-dimensional structure and are critical for the biological activity of many peptides including insulin.
StabilityA peptide’s resistance to chemical degradation over time. Affected by temperature, pH, light, and oxidation. Lyophilized peptides are most stable; reconstituted peptides should be refrigerated and used within 28 days.
Half-lifeThe time required for the concentration of a peptide in the body to decrease by half. Determines dosing frequency — short half-life peptides (minutes) need daily dosing, while long half-life peptides (days) can be dosed weekly.