Acetylation
Acetylation — A chemical modification in which an acetyl group is added to the N-terminus of a peptide, improving stability and resistance to enzymatic degradation.
What Is N-Terminal Acetylation?
N-terminal acetylation is the addition of an acetyl group (CH3CO-) to the N-terminal amino group of a peptide. Combined with C-terminal amidation, acetylation produces a peptide with no free termini, eliminating both the N-terminal positive charge and the C-terminal negative charge. This dual modification is a standard strategy for improving peptide stability and bioactivity.
Effects
- Aminopeptidase resistance: Blocked N-terminus prevents sequential degradation by aminopeptidases
- Charge neutralization: Removes N-terminal positive charge, making the peptide more membrane-permeable
- Helix stabilization: Acetylation stabilizes alpha-helix at the N-terminus by capping the helix dipole
- Synthesis: Simple acetic anhydride treatment on resin before cleavage
Frequently Asked Questions
What is Acetylation?
A chemical modification in which an acetyl group is added to the N-terminus of a peptide, improving stability and resistance to enzymatic degradation.
Why is Acetylation important in peptide research?
Acetylation is a fundamental concept in modification 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.