Attomole level protein sequencing by Edman degradation coupled with accelerator mass spectrometry

Masahiro Miyashita, Jack M. Presley, Bruce A. Buchholz, Kit Lam, Young Moo Lee, John S. Vogel, Bruce D. Hammock

Research output: Contribution to journalArticlepeer-review

36 Scopus citations


Edman degradation remains the primary method for determining the sequence of proteins. In this study, accelerator mass spectrometry was used to determine the N-terminal sequence of glutathione S-transferase at the attomole level with zeptomole precision using a tracer of 14C. The transgenic transferase was labeled by growing transformed Escherichia coli on [14C]glucose and purified by microaffinity chromatography. An internal standard of peptides on a solid phase synthesized to release approximately equal amounts of all known amino acids with each cycle were found to increase yield of gas phase sequencing reactions and subsequent semimicrobore HPLC as did a lactoglobulin carrier. This method is applicable to the sequencing of proteins from cell culture and illustrates a path to more general methods for determining N-terminal sequences with high sensitivity.

Original languageEnglish (US)
Pages (from-to)4403-4408
Number of pages6
JournalProceedings of the National Academy of Sciences of the United States of America
Issue number8
StatePublished - Apr 10 2001

ASJC Scopus subject areas

  • Genetics
  • General


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