Global Phosphoproteomic Mapping of Early Mitotic Exit in Human Cells Identifies Novel Substrate Dephosphorylation Motifs.

{"sci_version": "1.0", "schema": "https://corpus.bntrg.co.uk/sci/1.0/sci.schema.json", "id": "pmid:26055452", "kind": "science-record", "revision": 2, "content_hash": "sha256:8103726116f2327bab98a32cd2a81c4d5c786e5d07b46088c01684bab6878b91", "created_at": "2026-11-01T17:31:10Z", "updated_at": "2026-11-01T18:47:24Z", "generator": {"name": "corpus-assay-engine", "run_id": "reading-sci-2026-11-01"}, "paper": {"state": "complete", "title": "Global Phosphoproteomic Mapping of Early Mitotic Exit in Human Cells Identifies Novel Substrate Dephosphorylation Motifs.", "doi": "10.1074/mcp.M114.046938", "pmid": "26055452", "authors": ["Rachael A McCloy", "Benjamin L Parker", "Samuel Rogers", "Rima Chaudhuri", "Velimir Gayevskiy", "Nolan J Hoffman", "Naveid Ali", "D Neil Watkins", "Roger J Daly", "David E James", "Thierry Lorca", "Anna Castro", "Andrew Burgess"], "journal": "Molecular & cellular proteomics : MCP", "year": 2015, "abstract": "Entry into mitosis is driven by the coordinated phosphorylation of thousands of proteins. For the cell to complete mitosis and divide into two identical daughter cells it must regulate dephosphorylation of these proteins in a highly ordered, temporal manner. There is currently a lack of a complete understanding of the phosphorylation changes that occur during the initial stages of mitotic exit in human cells. Therefore, we performed a large unbiased, global analysis to map the very first dephosphorylation events that occur as cells exit mitosis. We identified and quantified the modification of >16,000 phosphosites on >3300 unique proteins during early mitotic exit, providing up to eightfold greater resolution than previous studies. The data have been deposited to the ProteomeXchange with identifier PXD001559. Only a small fraction (∼ 10%) of phosphorylation sites were dephosphorylated during early mitotic exit and these occurred on proteins involved in critical early exit events, including organization of the mitotic spindle, the spindle assembly checkpoint, and reformation of the nuclear envelope. Surprisingly this enrichment was observed across all kinase consensus motifs, indicating that it is independent of the upstream phosphorylating kinase. Therefore, dephosphorylation of these sites is likely determined by the specificity of phosphatase/s rather than the activity of kinase/s. Dephosphorylation was significantly affected by the amino acids at and surrounding the phosphorylation site, with several unique evolutionarily conserved amino acids correlating strongly with phosphorylation status. These data provide a potential mechanism for the specificity of phosphatases, and how they co-ordinate the ordered events of mitotic exit. In summary, our results provide a global overview of the phosphorylation changes that occur during the very first stages of mitotic exit, providing novel mechanistic insight into how phosphatase/s specifically regulate this critical transition.", "claims": [{"id": "claim-data-access", "statement": "The data have been deposited to the ProteomeXchange with identifier PXD001559.", "kind": "methodological", "target": null, "evidence": [{"asset": "source:pmid:26055452", "locator": "sections[0] \"Abstract\" paragraph 1", "quote": "The data have been deposited to the ProteomeXchange with identifier PXD001559."}], "state": "complete"}, {"id": "claim-target-result", "statement": "The study identified and quantified more than 16,000 phosphosites on more than 3,300 unique proteins during early mitotic exit.", "kind": "qualitative", "target": null, "evidence": [{"asset": "source:pmid:26055452", "locator": "sections[0] \"Abstract\" paragraph 1", "quote": "We identified and quantified the modification of >16,000 phosphosites on >3300 unique proteins during early mitotic exit, providing up to eightfold greater resolution than previous studies."}], "state": "complete"}], "gaps": []}, "experiment": {"state": "complete", "objective": "The study identified and quantified more than 16,000 phosphosites on more than 3,300 unique proteins during early mitotic exit.", "steps": [{"id": "read_published_estimate", "order": 1, "name": "Read the published estimate from the source", "kind": "other", "state": "complete", "blocked_on": null, "description": "The claim, method and evidence span published with the source article.", "duration_hours": null, "parameters": {}, "inputs": ["source:pmid:26055452"], "outputs": ["the published estimate and its evidence"], "instruments": [], "reagents": []}, {"id": "obtain_source_data", "order": 2, "name": "Obtain the source data from the named repository", "kind": "data-preparation", "state": "complete", "blocked_on": null, "description": "The GEO series accession resolves and its sample accessions are listed. 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