Ser21

Site Information
KsRHNPQsPLQESsA SwissProt Entrez-Gene
Blast this site against: NCBI SwissProt PDB
Site Group ID: 453006

In vivo Characterization
Methods used to characterize site in vivo:	immunoprecipitation ( 1 ) , mass spectrometry ( 1 , 3 , 4 , 5 , 6 , 7 , 8 , 9 , 10 , 11 , 12 , 13 , 14 , 15 , 16 , 17 , 18 , 19 , 20 , 21 , 22 , 23 ) , phospho-antibody ( 1 ) , western blotting ( 1 )
Disease tissue studied:	brain cancer ( 10 , 11 , 12 , 13 ) , neuroblastoma ( 15 ) , neuroendocrine cancer ( 10 , 11 , 12 , 13 ) , melanoma skin cancer ( 22 )
Relevant cell line - cell type - tissue:	'3T3-L1, differentiated' (adipocyte) ( 3 , 6 ) , 'brain, embryonic' ( 21 ) , 'neuron, cortical'-brain ( 1 ) , 32Dcl3 (myeloid) [FLT3 (mouse), transfection, chimera with human FLT3-ITD mutant (corresponding to wild type P36888 ( 20 ) , 32Dcl3 (myeloid) ( 20 ) , brain ( 8 , 9 , 10 , 11 , 12 , 13 , 17 , 19 ) , embryo ( 1 ) , HEK293-A (epithelial) ( 1 ) , HeLa (cervical) ( 16 ) , Hepa 1-6 (epithelial) ( 23 ) , HL-1 (myocyte) [Akt1 (mouse), knockdown, stable lentiviral expression of Akt1 shRNA] ( 5 ) , HL-1 (myocyte) [Akt2 (mouse), knockdown, stable lentiviral expression of Akt2 shRNA] ( 5 ) , HL-1 (myocyte) ( 5 ) , kidney ( 17 ) , macrophage-bone marrow ( 18 ) , macrophage-bone marrow [DUSP1 (mouse), homozygous knockout] ( 18 ) , macrophage-peritoneum ( 7 ) , MEF (fibroblast) ( 14 ) , N1E-115 (neuron) ( 15 ) , RAW 264.7 (macrophage) ( 4 ) , skin [mGluR1 (mouse), transgenic, TG mutant mice] ( 22 ) , testis ( 17 )

Upstream Regulation
Regulatory protein:	Tau (mouse) ( 1 )
Treatments:	insulin ( 6 ) , LPS ( 18 ) , LY294002 ( 6 )

References
1	Tseng JH, et al. (2021) Tau seeds are subject to aberrant modifications resulting in distinct signatures. Cell Rep 35, 109037 33910013 Curated Info
2	Sacco F, et al. (2016) Glucose-regulated and drug-perturbed phosphoproteome reveals molecular mechanisms controlling insulin secretion. Nat Commun 7, 13250 27841257 Curated Info
3	Parker BL, et al. (2015) Targeted phosphoproteomics of insulin signaling using data-independent acquisition mass spectrometry. Sci Signal 8, rs6 26060331 Curated Info
4	Pinto SM, et al. (2015) Quantitative phosphoproteomic analysis of IL-33-mediated signaling. Proteomics 15, 532-44 25367039 Curated Info
5	Reinartz M, Raupach A, Kaisers W, Gödecke A (2014) AKT1 and AKT2 induce distinct phosphorylation patterns in HL-1 cardiac myocytes. J Proteome Res 13, 4232-45 25162660 Curated Info
6	Humphrey SJ, et al. (2013) Dynamic Adipocyte Phosphoproteome Reveals that Akt Directly Regulates mTORC2. Cell Metab 17, 1009-20 23684622 Curated Info
7	Wu X, et al. (2012) Investigation of receptor interacting protein (RIP3)-dependent protein phosphorylation by quantitative phosphoproteomics. Mol Cell Proteomics 11, 1640-51 22942356 Curated Info
8	Trinidad JC, et al. (2012) Global identification and characterization of both O-GlcNAcylation and phosphorylation at the murine synapse. Mol Cell Proteomics 11, 215-29 22645316 Curated Info
9	Goswami T, et al. (2012) Comparative phosphoproteomic analysis of neonatal and adult murine brain. Proteomics 12, 2185-9 22807455 Curated Info
10	Guo A (2011) CST Curation Set: 12736; Year: 2011; Biosample/Treatment: tissue, brain/untreated; Disease: brain cancer; SILAC: -; Specificities of Antibodies Used to Purify Peptides prior to LCMS: PXpSP, pSPX(K/R) Antibodies Used to Purify Peptides prior to LCMS: Phospho-MAPK/CDK Substrates (PXSP or SPXR/K) (34B2) Rabbit mAb Cat#: 2325, PTMScan(R) Phospho-MAPK/CDK Substrate Motif (PXSP, SPXK/R) Immunoaffinity Beads Cat#: 1982 Curated Info
11	Guo A (2011) CST Curation Set: 12737; Year: 2011; Biosample/Treatment: tissue, brain/untreated; Disease: brain cancer; SILAC: -; Specificities of Antibodies Used to Purify Peptides prior to LCMS: PXpSP, pSPX(K/R) Antibodies Used to Purify Peptides prior to LCMS: Phospho-MAPK/CDK Substrates (PXSP or SPXR/K) (34B2) Rabbit mAb Cat#: 2325, PTMScan(R) Phospho-MAPK/CDK Substrate Motif (PXSP, SPXK/R) Immunoaffinity Beads Cat#: 1982 Curated Info
12	Guo A (2011) CST Curation Set: 12738; Year: 2011; Biosample/Treatment: tissue, brain/untreated; Disease: brain cancer; SILAC: -; Specificities of Antibodies Used to Purify Peptides prior to LCMS: PXpSP, pSPX(K/R) Antibodies Used to Purify Peptides prior to LCMS: Phospho-MAPK/CDK Substrates (PXSP or SPXR/K) (34B2) Rabbit mAb Cat#: 2325, PTMScan(R) Phospho-MAPK/CDK Substrate Motif (PXSP, SPXK/R) Immunoaffinity Beads Cat#: 1982 Curated Info
13	Guo A (2011) CST Curation Set: 12739; Year: 2011; Biosample/Treatment: tissue, brain/untreated; Disease: brain cancer; SILAC: -; Specificities of Antibodies Used to Purify Peptides prior to LCMS: PXpSP, pSPX(K/R) Antibodies Used to Purify Peptides prior to LCMS: Phospho-MAPK/CDK Substrates (PXSP or SPXR/K) (34B2) Rabbit mAb Cat#: 2325, PTMScan(R) Phospho-MAPK/CDK Substrate Motif (PXSP, SPXK/R) Immunoaffinity Beads Cat#: 1982 Curated Info
14	Yu Y, et al. (2011) Phosphoproteomic analysis identifies Grb10 as an mTORC1 substrate that negatively regulates insulin signaling. Science 332, 1322-6 21659605 Curated Info
15	Wang Y, et al. (2011) Spatial phosphoprotein profiling reveals a compartmentalized extracellular signal-regulated kinase switch governing neurite growth and retraction. J Biol Chem 286, 18190-201 21454597 Curated Info
16	Hegemann B, et al. (2011) Systematic phosphorylation analysis of human mitotic protein complexes. Sci Signal 4, rs12 22067460 Curated Info
17	Huttlin EL, et al. (2010) A tissue-specific atlas of mouse protein phosphorylation and expression. Cell 143, 1174-89 21183079 Curated Info
18	Weintz G, et al. (2010) The phosphoproteome of toll-like receptor-activated macrophages. Mol Syst Biol 6, 371 20531401 Curated Info
19	Wiśniewski JR, et al. (2010) Brain phosphoproteome obtained by a FASP-based method reveals plasma membrane protein topology. J Proteome Res 9, 3280-9 20415495 Curated Info
20	Choudhary C, et al. (2009) Mislocalized activation of oncogenic RTKs switches downstream signaling outcomes. Mol Cell 36, 326-39 19854140 Curated Info
21	Zhou J (2009) CST Curation Set: 7411; Year: 2009; Biosample/Treatment: tissue, brain/untreated; Disease: -; SILAC: -; Specificities of Antibodies Used to Purify Peptides prior to LCMS: HXXp[ST] Curated Info
22	Zanivan S, et al. (2008) Solid tumor proteome and phosphoproteome analysis by high resolution mass spectrometry. J Proteome Res 7, 5314-26 19367708 Curated Info
23	Pan C, Gnad F, Olsen JV, Mann M (2008) Quantitative phosphoproteome analysis of a mouse liver cell line reveals specificity of phosphatase inhibitors. Proteomics 8, 4534-46 18846507 Curated Info