How to prepare samples for phosphoproteomics mass spectrometry?

Sample preparation of phosphorylated proteins is crucial for subsequent mass spectrometry analysis. The general steps are as follows:

1. Protein Extraction:

(1) Use an appropriate buffer to extract total proteins from cells or tissues.

(2) To prevent protease activity, protease inhibitors can be added.

(3) To prevent the loss of phosphorylation sites during extraction, it is important to use phosphatase inhibitors.

2. Protein Purification and Concentration:

(1) Proteins can be concentrated by methods such as ultrafiltration or centrifugation.

(2) Immunoprecipitation or affinity chromatography can also be used to further purify specific proteins or protein complexes.

3. Protease Digestion:

Typically, Trypsin is used for protease digestion to break down proteins into peptides.

4. Phosphorylation Site Enrichment:

Since phosphorylated proteins or peptides are usually present at low abundance in the sample, it is necessary to enrich phosphorylated peptides using affinity chromatography methods, such as metal chelate chromatography or immunoprecipitation.

5. Liquid Chromatography Separation:

Use high-performance liquid chromatography (HPLC) for further separation and elution of peptides.

At this point, the obtained peptides can be subjected to mass spectrometry.

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