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Free keywords:
IDENTIFICATION RATES; MASS-SPECTROMETRY; LTQ ORBITRAP; PURIFICATION;
STRATEGY; BIOLOGY; CELLSBiochemistry & Molecular Biology;
Abstract:
We developed EASI-tag (easily abstractable sulfoxide-based isobaric-tag), a new type of amine-derivatizing and sulfoxide- containing isobaric labeling reagents for highly accurate quantitative proteomics analysis using mass spectrometry. We observed that EASI-tag labels dissociate at low collision energy and generate peptide-coupled, interference-free reporter ions with high yield. Efficient isolation of C-12 precursors and quantification at the MS2 level allowed accurate determination of quantitative differences between up to six multiplexed samples.