Journal
MOLECULAR BIOTECHNOLOGY
Volume 43, Issue 1, Pages 59-66Publisher
HUMANA PRESS INC
DOI: 10.1007/s12033-009-9176-6
Keywords
Acetonitrile precipitation; Immobilized-metal-ion affinity chromatography; Mass spectrometry; Nucleic acid; Phosphopeptide
Funding
- Natural Science Foundation of China [30623009, 30721063]
- State Key Basic Research Program of China [2007CB507404]
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Immobilized-metal-ion affinity chromatography (IMAC) is used extensively for phosphopeptide enrichment in phosphoproteomics. However, the effect of nucleic acids in protein samples on phosphopeptide enrichment by IMAC has not yet been well clarified. In this study, we demonstrate that IMAC beads possess a strong adsorption of nucleic acids, especially single-stranded or single-stranded-region-containing nucleic acids, leading to approximately 50% loss of phosphopeptides during the process of IMAC enrichment. Therefore, nucleic acids must be removed from protein samples prior to IMAC. Acetonitrile (ACN) precipitation, a simple and efficient procedure, was established to remove nucleic acids from the protein samples. We showed that ACN precipitation approximately doubled the phosphopeptide number identified by IMAC and mass spectrometry, indicating that nucleic acid removal significantly improves the identification of phosphopeptides.
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