Abstract
We have modified the biotin switch assay for protein S-nitrosothiols (SNOs), using resin-assisted capture (SNO-RAC). Compared with existing methodologies, SNO-RAC requires fewer steps, detects high-mass S-nitrosylated proteins more efficiently, and facilitates identification and quantification of S-nitrosylated sites by mass spectrometry. When combined with iTRAQ labeling, SNO-RAC revealed that intracellular proteins may undergo rapid denitrosylation on a global scale. This methodology is readily adapted to analyzing diverse cysteine-based protein modifications, including S-acylation.
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Acknowledgements
We thank S. Nimkar (Applied Biosystems) for providing iTRAQ reagents, and Q. Sun, K. Ozawa, A. Hausladen and D. Hess for expert advice. This work was supported by National Institutes of Health grants U19-ES012496, P01-HL075443, HL075443 and HL059130.
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Contributions
M.T.F., M.W.F. and L.N. performed experiments and analyzed data. J.W.T. and M.A.M. acquired and analyzed mass spectrometry data. M.T.F. and J.S.S. wrote the manuscript.
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Duke University (M.T.F., M.W.F., J.S.S.) has applied for a patent based on this methodology.
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Supplementary Text and Figures
Supplementary Figures 1–7, Supplementary Tables 1–3 (PDF 1291 kb)
Supplementary Table 4
MS spectra from all identified SNO-sites in CysNO-treated RAW264.7 macrophages and MG1655 E. coli. MSE (IdentityE) database search matches for the macrophage experiment are presented as Mascot searches for the purposes of display. (PDF 12223 kb)
Supplementary Table 5
Data from MS analyses of iTRAQ-coupled SNO-RAC. (ZIP 12668 kb)
Supplementary Table 6
MS/MS spectra from high mass protein-SNO identifications. (ZIP 1156 kb)
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Forrester, M., Thompson, J., Foster, M. et al. Proteomic analysis of S-nitrosylation and denitrosylation by resin-assisted capture. Nat Biotechnol 27, 557–559 (2009). https://doi.org/10.1038/nbt.1545
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DOI: https://doi.org/10.1038/nbt.1545
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