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Comparison of Cyclization Strategies for Cyclic Peptide Design
Cyclization chemistry strongly influences affinity, stability, permeability, and manufacturability. We select the closure strategy according to sequence context, desired rigidity, and the degree of chemical complexity the program can support in later developme
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- Cyclization chemistry strongly influences affinity, stability, permeability, and manufacturability. We select the closure strategy according to sequence context, desired rigidity, and the degree of chemical complexity the program can support in later development.
- Head-to-Tail Macrocyclization
- Constrains the full peptide backbone into a compact ring
- Often delivers strong protease resistance and clear conformational control
- Natural-product-inspired scaffolds, receptor ligands, broad SAR campaigns
- Side-Chain-to-Side-Chain Lactam
- Creates a localized constraint without fully closing the backbone
- Useful for preserving active conformations while retaining design flexibility
- Helical motifs, epitope-focused designs, potency rescue studies
- Disulfide Cyclization
- Introduces reversible conformational locking through cysteine pairing
- Fast exploratory option for screening and topology scouting
- Early hit finding, extracellular targets, biologically reducing environments not dominant
- Thioether or Stable Side-Chain Linkage
- Produces chemically robust macrocycles with limited reversibility
- Higher chemical stability than disulfides and good translational potential
- Systemic therapeutics, serum-exposed programs, candidate-quality scaffolds
- Stapled / Hydrocarbon-Constrained Peptides
- Reinforces secondary structure, especially helical presentation
- Can improve helicity, protease resistance, and cellular uptake
- Intracellular PPIs, transcription-factor interfaces, helical binding motifs
- Bicyclic and Multicyclic Formats
- Deliver highly rigid architectures with multiple constrained loops
- Excellent for affinity maturation and difficult selectivity problems
- Challenging targets, enzyme inhibitors, high-stringency lead programs