We have developed a fully automatable two-dimensional liquid chromatography platform for shotgun proteomics analyses based on the online coupling of hydrophilic interaction liquid chromatography (HILIC) – using a nonionic type of TSKgel Amide 80 at either pH 6.8 (neutral) or 2.7 (acidic) – with conventional low-pH reversed-phase chromatography. Online coupling of the neutral-pH HILIC and reversed phase chromatography systems outperformed the acidic HILIC–reversed phase chromatography combination, resulting in 18.4% (1914 versus 1617 nonredundant proteins) and 41.6% (12,989 versus 9172 unique peptides) increases in the number of identified peptides and proteins from duplicate analyses of Rat pheochromocytoma lysates. Armed with this optimized HILIC–reversed phase liquid chromatography platform, we identified 2554 nonredundant proteins from duplicate analyses of a Saccharomyces cerevisiae lysate, with the detected protein abundances spanning from approximately 41 to 10⁶ copies per cell, which contained up to approximately 2092 different validated protein species with a dynamic range of concentrations of up to approximately 10⁴. This present study establishes a fully automated platform as a promising methodology to enable online coupling of different hydrophilic HILIC and reversed phase chromatography systems, thereby expanding the repertoire of multidimensional liquid chromatography for shotgun proteomics.

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5 References

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Volume35, Issue14

July 2012

Pages 1755-1763

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jssc2792-sup-0001-Tables1.pdf447.8 KB	Table S1

Fully automatable two-dimensional hydrophilic interaction liquid chromatography–reversed phase liquid chromatography with online tandem mass spectrometry for shotgun proteomics

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Fully automatable two-dimensional hydrophilic interaction liquid chromatography–reversed phase liquid chromatography with online tandem mass spectrometry for shotgun proteomics

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