Abstract
Reversible thiol oxidation of cysteine residues occurs in many intracellular catalytic and signaling processes. Here we describe an optimized protocol, which can be completed in ∼5 d, to unambiguously identify specific cysteine residues that are transiently and reversibly oxidized by comparing two complex biological samples obtained from yeast cell cultures at the proteome level. After 'freezing' the in vivo thiol stage of cysteine residues by medium acidification, we first block reduced thiols in extracts with iodoacetamide (IAM), and then we sequentially reduce and label reversible oxidized thiols with the biotin-based heavy or light IAM derivatives, which are known as isotope-coded affinity tag (ICAT) reagents, so that the two samples can be compared at once after combination of the labeled extracts, trypsin digestion, streptavidin-affinity purification of peptides containing oxidized cysteines, and liquid chromatography–tandem mass spectrometry (LC-MS/MS) analysis. For the same protein extracts, before cysteine-containing peptide enrichment, individual relative protein concentrations are obtained by stable-isotope dimethyl labeling.
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Acknowledgements
We acknowledge the Centre for Genomic Regulation-Universitat Pompeu Fabra (CRG-UPF) proteomic facility where the LC-MS/MS experiments were performed. This work was supported by the Spanish Ministry of Science and Innovation (nos. BFU2009-06933 and BFU2012-32045), by PLAN E and Fondo Europeo de Desarrollo Regional (FEDER), by the Spanish program Consolider-Ingenio 2010 (grant no. CSD 2007-0020) and by grant no. SGR2009-195 from Generalitat de Catalunya (Spain) to E.H. E.H. and J.A. are recipients of Institució Catalana de Recerca i Estudis Avançats (ICREA) Academia Awards (Generalitat de Catalunya).
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S.G.-S. and S.B. developed the protocol and conducted the experiments. S.G.-S., H.M. and S.B. interpreted the data. H.M. performed the LC-MS/MS experiments and edited the manuscript. A.D. performed some control experiments. J.A. provided intellectual expertise. S.G.-S. drafted the manuscript. E.H. was responsible for project supervision, data interpretation, manuscript editing and providing grant support.
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Integrated supplementary information
Supplementary Figure 1 TCA followed by IAM, but not only IAM, is required to display the transient H2O2-dependent in vivo oxidation of Pap1.
Wild-type strain 972 was treated or not with 0.2 mM H2O2 for 5 min. Cells were then lysed in the presence of TCA, proteins in the lysates were then alkylated with IAM, and Pap1 redox state was analyzed by non-reducing electrophoresis and Western blot analysis as described before (Vivancos et al. 2005, PNAS 102:8875) (A). Alternatively, 75 mM IAM was added to both cell cultures and cell pellets prior to lysis (B), or only to cell pellets prior to lysis (C), and samples were processed for Western blot analysis as described above.
Supplementary Figure 2 Effect of SDS and Tris-HCl in the labeling of oxidized cysteines and proteins in their N-terminal sites.
Left panel, oxidized cysteines from wild-type (WT) and Δtrr1 cells were labelled with a fluorescent derivative of iodoacetamide (FIAM) as described in García-Santamarina et al. 2011, J. Proteomics 74:2476, using either ICAT buffer (buffer 1; 200 mM Tris-HCl, 0.05% SDS, 6 M urea, 5 mM EDTA) or a buffer without Tris-HCl and SDS (buffer 2; 200 mM Triethyl-ammonium bicarbonate 1 M, pH 8.5 , 6 M urea). Right panel, 100 µg of protein extracts in 50 µl from wild-type (WT) and Δtrr1 cells were labelled at their N-terminal sites with 2.5 µl of 1 mg/ml fluorescein isothiocyanate (FITC), either in ICAT buffer (buffer 1) or in a buffer without Tris-HCl and SDS (buffer 2). In both cases, protein extracts were electrophoretically separated by reducing SDS-PAGE. After electrophoresis fluorescence was scanned in a Typhoon 8600 using λex. 532 nm and λem. 526 nm. Silver staining was used as a protein loading control.
Supplementary information
Supplementary Figure 1
TCA followed by IAM, but not only IAM, is required to display the transient H2O2-dependent in vivo oxidation of Pap1. (PDF 93 kb)
Supplementary Figure 2
Effect of SDS and Tris-HCl in the labeling of oxidized cysteines and proteins in their N-terminal sites. (PDF 319 kb)
Supplementary Table 1
Peptides with oxidized cysteines (ICAT ratio vs protein concentration >1.5 in two biological replicates) identified from wild-type H2O2-treated vs wild-type untreated fission yeast cells. (XLS 48 kb)
Supplementary Table 2
Peptides with oxidized cysteines (ICAT ratio vs protein concentration >1.5 in two biological replicates) identified from Δtrr1 vs wild-type untreated fission yeast cells. (XLS 48 kb)
Supplementary Table 3
Peptides with oxidized cysteines (ICAT ratio vs protein concentration >1.5 in two biological replicates) identified from Δtrx1 vs wild-type untreated fission yeast cells. (XLS 37 kb)
Supplementary Data 1
Description LC gradient with 84 min (marked '120 minutes') and 147 min (marked '180 minutes') resolving gradients. (PDF 40 kb)
Supplementary Data 2
MS and MS/MS parameters for a Q-Exactive mass spectrometer operated in data dependent (dd) mode. (PDF 100 kb)
Supplementary Data 3
Retention time comparison of identical cysteine-containing peptides modified by carbamidomethyl (ca) and/or ICAT measured in the same experiment. (PDF 109 kb)
Supplementary Data 4
MS/MS spectra of the triply charged peptide. (PDF 130 kb)
Supplementary Data 5
MS spectrum of the triply charged peptide. (PDF 143 kb)
Supplementary Data 6
Three dimensional plot of the ICAT-labelled peptide pair shown in Supplementary Data 5. (PDF 283 kb)
Supplementary Data 7
Modifications used to search tandem MS data (MS/MS). (PDF 70 kb)
Supplementary Data 8
Five important steps needed to launch a MaxQuant 1.3.0.5 analysis. (PDF 150 kb)
Supplementary Data 9
The 'peptide.txt' file contains the dimethyl-based quantification results as well as the ICAT-based quantification results. (PDF 52 kb)
Supplementary Data 10
Scatter plot of measured ICAT ratios. (PDF 54 kb)
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García-Santamarina, S., Boronat, S., Domènech, A. et al. Monitoring in vivo reversible cysteine oxidation in proteins using ICAT and mass spectrometry. Nat Protoc 9, 1131–1145 (2014). https://doi.org/10.1038/nprot.2014.065
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DOI: https://doi.org/10.1038/nprot.2014.065
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