Multiplexed absolute quantification for proteomics using concatenated signature peptides encoded by QconCAT genes

Julie M Pratt, Deborah M Simpson, Mary K Doherty, Jenny Rivers, Simon J Gaskell, Robert J Beynon

Research output: Contribution to journalArticle

274 Citations (Scopus)

Abstract

An important area of proteomics involves the need for quantification, whether relative or absolute. Many methods now exist for relative quantification, but to support biomarker proteomics and systems biology, absolute quantification rather than relative quantification is required. Absolute quantification usually involves the concomitant mass spectrometric determination of signature proteotypic peptides and stable isotope-labeled analogs. However, the availability of standard labeled signature peptides in accurately known amounts is a limitation to the widespread adoption of this approach. We describe the design and synthesis of artificial QconCAT proteins that are concatamers of tryptic peptides for several proteins. This protocol details the methods for the design, expression, labeling, purification, characterization and use of the QconCATs in the absolute quantification of complex protein mixtures. The total time required to complete this protocol (from the receipt of the QconCAT expression plasmid to the absolute quantification of the set of proteins encoded by the QconCAT protein in an analyte sample) is approximately 29 d.
Original languageEnglish
Pages (from-to)1029-1043
Number of pages15
JournalNature Protocols
Volume1
Issue number2
DOIs
Publication statusPublished - 2006

Keywords

  • Genes, Synthetic
  • Genetic Techniques
  • Peptides
  • Protein Biosynthesis
  • Proteomics
  • Time Factors

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