Pseudopeptide
Pseudopeptide — A peptide analog where one or more peptide bonds are replaced with alternative linkages to improve metabolic stability while retaining activity.
What Is a Pseudopeptide?
A pseudopeptide contains one or more modified peptide bonds replaced by isosteric surrogates that resist enzymatic hydrolysis. Common replacements include reduced amide (ψ[CH2NH]), methyleneamino (ψ[CH2N]), thioamide (ψ[CSNH]), and retroamide (ψ[NHCO]). Each modification alters local geometry, H-bonding, and backbone flexibility.
Amide Bond Surrogates
- Reduced amide (ψ[CH2NH]): More flexible, basic nitrogen. Fully protease resistant at that site
- Ester (ψ[COO]): Depsipeptide. Used in cyclization strategies
- E-alkene (ψ[CH=CH]): Rigid, planar. Mimics trans amide geometry without H-bond donor
- Triazole (ψ[triazole]): From click chemistry. Stable, similar geometry to trans amide
Frequently Asked Questions
What is Pseudopeptide?
A peptide analog where one or more peptide bonds are replaced with alternative linkages to improve metabolic stability while retaining activity.
Why is Pseudopeptide important in peptide research?
Pseudopeptide is a fundamental concept in chemistry 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.