Aib (α-Aminoisobutyric Acid)
Aib (α-Aminoisobutyric Acid) — A non-proteinogenic amino acid used in peptide design to promote helical structure and enhance resistance to proteolytic degradation.
What Is Aib?
Aib (alpha-aminoisobutyric acid, 2-methylalanine) is a non-proteinogenic amino acid with two methyl groups on the alpha-carbon instead of one. This gem-dimethyl substitution strongly restricts backbone conformational flexibility and is the most powerful helix-inducing residue known. Aib forces the backbone into alpha-helical or 310-helical conformations.
Applications
- Helix nucleation: A single Aib residue nucleates helical structure in short peptides
- Peptaibols: Fungal antimicrobial peptides (alamethicin, trichogin) naturally contain multiple Aib residues
- GLP-1 analogs: Aib substitution at position 8 protects against DPP-IV cleavage (semaglutide contains Aib8)
- Protease resistance: Gem-dimethyl substitution blocks protease recognition
Frequently Asked Questions
What is Aib (α-Aminoisobutyric Acid)?
A non-proteinogenic amino acid used in peptide design to promote helical structure and enhance resistance to proteolytic degradation.
Why is Aib (α-Aminoisobutyric Acid) important in peptide research?
Aib (α-Aminoisobutyric Acid) is a fundamental concept in amino acid 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.
Authority Sources
- Aib (α-Aminoisobutyric Acid) on Wikipedia
- Search Aib (α-Aminoisobutyric Acid) on PubChem (NIH)
- Research articles on ScienceDirect