Edman Sequencing
Edman Sequencing — A method for determining amino acid sequence by sequential chemical removal and identification of N-terminal residues, complementing mass spectrometry approaches.
What Is Edman Sequencing?
Edman degradation sequencing is the classical method for determining peptide sequence by iteratively removing and identifying the N-terminal amino acid. Each cycle cleaves one residue using phenylisothiocyanate (PITC), converts it to a PTH-amino acid derivative, and identifies it by HPLC.
Details
- Cycle: Coupling (PITC + N-terminal amine) → Cleavage (TFA) → Conversion (acid) → Identification (HPLC)
- Limit: Typically 30-50 residues before signal-to-noise degrades. Requires free N-terminus
- Modern role: Largely replaced by MS/MS but still used for confirming N-terminal sequence and blocking modifications
Frequently Asked Questions
What is Edman Sequencing?
A method for determining amino acid sequence by sequential chemical removal and identification of N-terminal residues, complementing mass spectrometry approaches.
Why is Edman Sequencing important in peptide research?
Edman Sequencing 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
- Edman Sequencing on Wikipedia
- Search Edman Sequencing on PubChem (NIH)
- Research articles on ScienceDirect