Determining absolute quantity as well as alternative splice forms and modifications of proteins present in a biological sample rapidly and ...


Ontology type: sgo:Patent     


Patent Info

DATE

2010-02-02T00:00

AUTHORS

AEBERSOLD RUDOLF H

ABSTRACT

The invention provides methods for identifying and quantifying polypeptides in a sample. The methods include the steps of labeling peptides in a polypeptide sample with an isotope tag; adding a plurality of peptide standards to the polypeptide sample, wherein the peptide standards are labeled with an isotopically distinct version of the isotope tag; resolving the labeled sample and standard peptides into a plurality of fractions; analyzing the resolved fractions using mass spectrometry; identifying an isotope-tagged sample peptide in an analyzed fraction; and determining the amount of the identified isotope-tagged sample peptide in the analyzed fraction by comparison to the amount of isotope tagged standard peptide in the same fraction. More... »

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