Protein sequencing by mass spectrometry

Details Protein sequencing by mass spectrometry Protein sequencing by mass spectrometry

1992-12-21

1999-09-14

Weber, Jon P.

Radiant energy

Ionic separation or analysis

With sample supply means

250281, 250282, 250283, 435 23, B01D 5944, C12Q 137

Patent

active

059526530

ABSTRACT:
A method of analyzing a protein, namely determining the amino acid sequence of a protein is described. Trypsin is added to a protein to form a liquid phase mixture of trypsin and the protein. The disulfide linkages of the protein may be reduced and the resulting sulfhydryl groups alkylated either before or after the addition of trypsin. The trypsin is allowed to digest the protein long enough to cleave protein into tryptic fragments. A portion of the digested mixture is ionized by ion evaporation to produce gas phase ions of the tryptic fragments, the gas phase ions being predominantly doubly charged with one charge at each end of the doubly charged ions. The gas phase ions of the tryptic fragments are analyzed by sequentially selecting therefrom ions of a desired mass to charge ratio in a first mass analyzer. The selected ions are fragmented by collision in a second mass analyzer to produce daughter ions, and the daughter ions are then analyzed in a third mass analyzer.

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