Deuterium Exchange
Deuterium Exchange — A technique where hydrogen atoms in a peptide are replaced with deuterium to study protein dynamics, folding, and ligand binding by mass spectrometry.
What Is Deuterium Exchange?
Hydrogen-deuterium exchange (HDX) is a technique where backbone amide hydrogens in a peptide exchange with deuterium from D2O solvent. Hydrogen-bonded or solvent-inaccessible amide hydrogens exchange slowly, while exposed/flexible regions exchange rapidly. HDX coupled with MS (HDX-MS) maps peptide dynamics, binding interfaces, and conformational changes.
Workflow
- Labeling: Dilute peptide/protein into D2O buffer for defined time points (10s to 4h)
- Quench: Drop pH to 2.5 and temperature to 0°C to stop exchange
- Digestion: Pepsin digestion (active at pH 2.5) generates peptide fragments
- Detection: LC-MS measures mass increase (+1 Da per deuterium) per fragment
Frequently Asked Questions
What is Deuterium Exchange?
A technique where hydrogen atoms in a peptide are replaced with deuterium to study protein dynamics, folding, and ligand binding by mass spectrometry.
Why is Deuterium Exchange important in peptide research?
Deuterium Exchange is a fundamental concept in analytical 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
- Deuterium Exchange on Wikipedia
- Search Deuterium Exchange on PubChem (NIH)
- Research articles on ScienceDirect