Quantitative Phosphoproteomics in Fatty Acid Stimulated Saccharomyces cerevisiae
Summary
Description of a quantitative phosphorylation procedure using cryolysis, urea solubilziation, HILIC fractionation and IMAC enrichment of phosphorylated peptides.
Abstract
This protocol describes the growth and stimulation, with the fatty acid oleate, of isotopically heavy and light S. cerevisiae cells. Cells are ground using a cryolysis procedure in a ball mill grinder and the resulting grindate brought into solution by urea solubilization. This procedure allows for the lysis of the cells in a metabolically inactive state, preserving phosphorylation and preventing reorientation of the phosphoproteome during cell lysis. Following reduction, alkylation, trypsin digestion of the proteins, the samples are desalted on C18 columns and the sample complexity reduced by fractionation using hydrophilic interaction chromatography (HILIC). HILIC columns preferentially retain hydrophilic molecules which is well suited for phosphoproteomics. Phosphorylated peptides tend to elute later in the chromatographic profile than the non phosphorylated counterparts. After fractionation, phosphopeptides are enriched using immobilized metal chromatography, which relies on charge-based affinities for phosphopeptide enrichment. At the end of this procedure the samples are ready to be quantitatively analyzed by mass spectrometry.
Protocol
Cell growth and media A single colony of BY4742Δarg4Δlys1 cells overnight in 100 mL rich media to an OD600 of 1.0 then seed into two 1 liter cultures of a minimal yeast medium (0.17% Yeast Nitrogen Base without Ammonium Sulfate or Amino Acids, 0.5% Ammonium sulfate) containing a full complement of amino acids, supplemented with 20mg/L of isotopically normal or heavy arginine (13C6 15N4; Isotec) and lysine (13C6</s…
Discussion
This method will yield an enrichment of phosphopeptides that can be quantitatively analyzed. A number of parameters can be altered in this protocol, but the most important aspect to remember is to preserve your phosphorylation. Preparation of cells for quantification can be achieved in a number of different ways, for example if you cannot label your cells in vivo, tags such as ICAT[3] or ITRAC [4] can be used post extraction to differentially label two cultures for quantification purposes.
<p class="jove_c…Acknowledgements
We would like to thank Dr. Rich Rogers for technical assistance with mass spectrometry analyses and helpful discussions, and Drs. Rob Moritz, Jeff Ranish, and Hamid Mirzai for helpful discussions.
This work was funded by the NIH Centers of Excellence.
Materials
| Material Name | Type | Company | Catalogue Number | Comment |
|---|---|---|---|---|
| Isotec™ L-Arginine-13C6,15N4 | Sigma-Aldrich | 608033 | ||
| Isotec™ L-Lysine-15N2 | Sigma-Aldrich | 609021 | ||
| GIBCO™ Phosphate-Buffered Saline (PBS) 7.4 (10X) liquid | Invitrogen | 70011044 | ||
| SigmaFAST Protease Inhibitor Tablets | Sigma-Aldrich | S8820 | ||
| Pierce Halt Phosphatase Inhibitor Cocktail | Thermo Scientific | 78420 | ||
| Retsch PM100 Ball Mill Grinder | Retsch | 20.540.0001 | ||
| Retsch 125 ml Stainless Steel Grinding Jar | Retsch | 01.462.0148 | ||
| Ultramicrospin C18 column | The Nest Group | SUM SS10 | ||
| Sep-Pak Vac 500 mg C18 | Waters | WAT043395 | ||
| TSK-Gel Amide-80 4.6 mm x 25 cm analytical column | TOSOH BioSciences | 13071 | This is the HILIC chromatographic column. | |
| Guard column 4.6 mm ID x1 cm | TOSOH BioSciences | 19021 | We recommend this guard column to extend the life of your HILIC column. | |
| PHOS-Select™ Iron Affinity Gel | Sigma-Aldrich | P9740 | This is the IMAC resin. Aliquot and store. |
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Tags
Quantitative PhosphoproteomicsFatty Acid StimulationSaccharomyces CerevisiaeGrowth And StimulationOleateIsotopically Heavy And Light CellsCryolysis ProcedureBall Mill GrinderUrea SolubilizationMetabolically Inactive StatePhosphorylation PreservationPreventing ReorientationCell LysisReductionAlkylationTrypsin DigestionDesalting On C18 ColumnsSample Complexity ReductionFractionation Using Hydrophilic Interaction Chromatography (HILIC)Phosphopeptides Elution ProfileImmobilized Metal ChromatographyCharge-based AffinitiesMass Spectrometry Analysis
Citer Cet Article
Saleem, R. A., Aitchison, J. D. Quantitative Phosphoproteomics in Fatty Acid Stimulated Saccharomyces cerevisiae. J. Vis. Exp. (32), e1474, doi:10.3791/1474 (2009).