High sensitivity quantitation of peptides by mass spectrometry

C - Chemistry – Metallurgy – 12 – Q

Patent

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Details

C12Q 1/37 (2006.01) C07K 1/13 (2006.01) C07K 1/22 (2006.01) C12N 9/00 (2006.01) G01N 30/02 (2006.01) G01N 33/48 (2006.01) G01N 33/483 (2006.01) G01N 33/53 (2006.01) G01N 33/543 (2006.01)

Patent

CA 2501000

The instant invention provides an economical flow-through method for determining amount of target proteins in a sample. An antibody preparation (whether polyclonal or monoclonal, or any equivalent specific binding agent) is used to capture and thus enrich a specific monitor peptide (a specific peptide fragment of a protein to be quantitated in a proteolytic digest of a complex protein sample) and an internal standard peptide (the same chemical structure but including stable isotope labels). Upon elution into a suitable mass spectrometer, the natural (sample derived) and internal standard (isotope labeled) peptides are quantitated, and their measured abundance ratio used to calculate the abundance of the monitor peptide, and its parent protein, in the initial sample

L'invention porte sur un procédé de transfert économique permettant de déterminer la quantité de protéines cibles dans un échantillon. Une préparation d'anticorps (polyclonaux ou monoclonaux, ou n'importe quel agent de liaison spécifique équivalent) sert à saisir puis à enrichir un peptide de contrôle spécifique (un fragment de peptide spécifique d'une protéine à quantifier dans un produit digéré protéolytique d'un échantillon de protéine complexe) et un peptide standard interne (la même structure chimique comprenant des marqueurs d'isotope stables). Lors de l'élution dans un spectromètre de masse adéquat, les peptides naturels (prélevés dans un échantillon) et les peptides standards internes (à marqueur isotope) sont quantifiés, et leur rapport des teneurs mesuré sert à calculer la teneur en peptide de contrôle ainsi que celle de sa protéine mère dans l'échantillon initial.

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