Ser421

Site Information
MGDDGQLsPGVLVRC SwissProt Entrez-Gene
Blast this site against: NCBI SwissProt PDB
Site Group ID: 2192771

In vivo Characterization
Methods used to characterize site in vivo:	mass spectrometry ( 1 , 3 , 4 , 5 , 6 , 7 , 8 , 9 , 10 , 11 , 12 , 13 , 14 , 15 , 16 , 17 , 18 , 19 , 20 , 21 , 22 , 23 , 24 , 25 , 26 , 27 , 28 , 29 , 30 , 31 , 32 , 33 , 34 , 35 , 36 , 37 , 38 , 39 , 40 , 41 , 42 , 43 , 44 , 45 , 46 , 47 , 48 , 49 , 50 , 51 , 52 )
Disease tissue studied:	HER2 positive breast cancer ( 1 ) , luminal A breast cancer ( 1 ) , luminal B breast cancer ( 1 ) , breast cancer, triple negative ( 1 ) , leukemia ( 8 , 23 , 24 ) , acute myelogenous leukemia ( 8 ) , chronic myelogenous leukemia ( 23 , 24 ) , lymphoma ( 3 ) , Burkitt's lymphoma ( 3 ) , follicular lymphoma ( 3 ) , teratoma ( 25 )
Relevant cell line - cell type - tissue:	BJAB (B lymphocyte) ( 3 ) , breast ( 1 ) , DG75 (B lymphocyte) ( 20 ) , FL-18 (B lymphocyte) ( 3 ) , HCT116 (intestinal) ( 44 ) , Jurkat (T lymphocyte) ( 4 , 5 , 6 , 7 , 9 , 10 , 11 , 12 , 13 , 14 , 15 , 16 , 17 , 18 , 19 , 21 , 22 , 26 , 27 , 28 , 29 , 30 , 31 , 32 , 33 , 34 , 35 , 36 , 37 , 38 , 39 , 40 , 41 , 42 , 43 , 45 , 46 , 47 , 48 , 49 , 50 , 51 , 52 ) , K562 (erythroid) ( 23 , 24 ) , KG-1 (myeloid) ( 8 ) , NCCIT (epithelial) ( 25 )

Upstream Regulation
Treatments:	antibody ( 51 )

References
1	Mertins P, et al. (2016) Proteogenomics connects somatic mutations to signalling in breast cancer. Nature 534, 55-62 27251275 Curated Info
2	Mertins P, et al. (2014) Ischemia in tumors induces early and sustained phosphorylation changes in stress kinase pathways but does not affect global protein levels. Mol Cell Proteomics 13, 1690-704 24719451 Curated Info
3	Rolland D, et al. (2014) Global phosphoproteomic profiling reveals distinct signatures in B-cell non-Hodgkin lymphomas. Am J Pathol 184, 1331-42 24667141 Curated Info
4	Mertins P, et al. (2013) Integrated proteomic analysis of post-translational modifications by serial enrichment. Nat Methods 10, 634-7 23749302 Curated Info
5	Guo A (2012) CST Curation Set: 13865; Year: 2012; Biosample/Treatment: cell line, Jurkat/calyculin_A & pervanadate; Disease: T cell leukemia; SILAC: -; Specificities of Antibodies Used to Purify Peptides prior to LCMS: RXXp[ST] Curated Info
6	Guo A (2012) CST Curation Set: 13866; Year: 2012; Biosample/Treatment: cell line, Jurkat/calyculin_A & pervanadate; Disease: T cell leukemia; SILAC: -; Specificities of Antibodies Used to Purify Peptides prior to LCMS: RXXp[ST] Antibodies Used to Purify Peptides prior to LCMS: Phospho-(Ser/Thr) PKD Substrate Antibody Cat#: 4381, PTMScan(R) Phospho-PKD Substrate Motif (LXRXXpS/pT) Immunoaffinity Beads Cat#: 1986 Curated Info
7	Mulhern D (2012) CST Curation Set: 13759; Year: 2012; Biosample/Treatment: cell line, Jurkat/calyculin_A & pervanadate; Disease: T cell leukemia; SILAC: -; Specificities of Antibodies Used to Purify Peptides prior to LCMS: RXXp[ST] Curated Info
8	Weber C, Schreiber TB, Daub H (2012) Dual phosphoproteomics and chemical proteomics analysis of erlotinib and gefitinib interference in acute myeloid leukemia cells. J Proteomics 75, 1343-56 22115753 Curated Info
9	Mulhern D (2011) CST Curation Set: 13261; Year: 2011; Biosample/Treatment: cell line, Jurkat/calyculin_A & pervanadate; Disease: T cell leukemia; SILAC: -; Specificities of Antibodies Used to Purify Peptides prior to LCMS: p[ST]Q Antibodies Used to Purify Peptides prior to LCMS: ATM/ATR substrate (s/t)QG Cat#: 6939 Curated Info
10	Mulhern D (2011) CST Curation Set: 13262; Year: 2011; Biosample/Treatment: cell line, Jurkat/calyculin_A & pervanadate; Disease: T cell leukemia; SILAC: -; Specificities of Antibodies Used to Purify Peptides prior to LCMS: p[ST]Q Antibodies Used to Purify Peptides prior to LCMS: ATM/ATR substrate (s/t)QG Cat#: 6939 Curated Info
11	Mulhern D (2011) CST Curation Set: 13265; Year: 2011; Biosample/Treatment: cell line, Jurkat/calyculin_A & pervanadate; Disease: T cell leukemia; SILAC: -; Specificities of Antibodies Used to Purify Peptides prior to LCMS: p[ST]Q Antibodies Used to Purify Peptides prior to LCMS: Phospho-(Ser/Thr) ATM/ATR Substrate (S/TQG) (P-S/T2-100) Rabbit mAb Cat#: 6966, PTMScan(R) Phospho-ATM/ATR Substrate Motif (S/TQG) Immunoaffinity Beads Cat#: 6969 Curated Info
12	Mulhern D (2011) CST Curation Set: 12744; Year: 2011; Biosample/Treatment: cell line, Jurkat/calyculin_A & pervanadate; Disease: T cell leukemia; SILAC: -; Specificities of Antibodies Used to Purify Peptides prior to LCMS: RXXp[ST] Antibodies Used to Purify Peptides prior to LCMS: Phospho-Akt Substrate (RXRXXS/T) (110B7) Rabbit mAb Cat#: 9614, PTMScan(R) Phospho-Akt Substrate Motif (RXXS/T) Immunoaffinity Beads Cat#: 1978 Curated Info
13	Mulhern D (2011) CST Curation Set: 12709; Year: 2011; Biosample/Treatment: cell line, Jurkat/calyculin_A & pervanadate; Disease: T cell leukemia; SILAC: -; Specificities of Antibodies Used to Purify Peptides prior to LCMS: p[ST]XP Curated Info
14	Mulhern D (2011) CST Curation Set: 12711; Year: 2011; Biosample/Treatment: cell line, Jurkat/calyculin_A & pervanadate; Disease: T cell leukemia; SILAC: -; Specificities of Antibodies Used to Purify Peptides prior to LCMS: p[ST]XP Curated Info
15	Mulhern D (2011) CST Curation Set: 12712; Year: 2011; Biosample/Treatment: cell line, Jurkat/calyculin_A & pervanadate; Disease: T cell leukemia; SILAC: -; Specificities of Antibodies Used to Purify Peptides prior to LCMS: p[ST]XP Curated Info
16	Mulhern D (2011) CST Curation Set: 12681; Year: 2011; Biosample/Treatment: cell line, Jurkat/calyculin_A & pervanadate; Disease: T cell leukemia; SILAC: -; Specificities of Antibodies Used to Purify Peptides prior to LCMS: (F/Y/M)Xp[ST](L/I/M) Curated Info
17	Guo A (2011) CST Curation Set: 11988; Year: 2011; Biosample/Treatment: cell line, Jurkat/calyculin_A & pervanadate; Disease: T cell leukemia; SILAC: -; Specificities of Antibodies Used to Purify Peptides prior to LCMS: (F/Y)XpS Curated Info
18	Guo A (2011) CST Curation Set: 11989; Year: 2011; Biosample/Treatment: cell line, Jurkat/calyculin_A & pervanadate; Disease: T cell leukemia; SILAC: -; Specificities of Antibodies Used to Purify Peptides prior to LCMS: p[ST]XP Antibodies Used to Purify Peptides prior to LCMS: Phospho-(Ser) 14-3-3 Binding Motif Antibody Cat#: 9601 Curated Info
19	Possemato A (2010) CST Curation Set: 10716; Year: 2010; Biosample/Treatment: cell line, Jurkat/pervanadate; Disease: T cell leukemia; SILAC: -; Specificities of Antibodies Used to Purify Peptides prior to LCMS: RXXp[ST] Curated Info
20	Iliuk AB, et al. (2010) In-depth analyses of kinase-dependent tyrosine phosphoproteomes based on metal ion-functionalized soluble nanopolymers. Mol Cell Proteomics 9, 2162-72 20562096 Curated Info
21	Possemato A (2010) CST Curation Set: 10290; Year: 2010; Biosample/Treatment: cell line, Jurkat/calyculin_A & pervanadate; Disease: T cell leukemia; SILAC: -; Specificities of Antibodies Used to Purify Peptides prior to LCMS: RXXp[ST] Curated Info
22	Possemato A (2010) CST Curation Set: 10116; Year: 2010; Biosample/Treatment: cell line, Jurkat/calyculin_A & pervanadate; Disease: T cell leukemia; SILAC: -; Specificities of Antibodies Used to Purify Peptides prior to LCMS: RXXp[ST] Antibodies Used to Purify Peptides prior to LCMS: Phospho-Akt Substrate (RXRXXS/T) (110B7) Rabbit mAb Cat#: 9614, PTMScan(R) Phospho-Akt Substrate Motif (RXXS/T) Immunoaffinity Beads Cat#: 1978 Curated Info
23	Beausoleil S (2010) CST Curation Set: 10282; Year: 2010; Biosample/Treatment: cell line, K-562/untreated; Disease: chronic myelogenous leukemia; SILAC: -; Specificities of Antibodies Used to Purify Peptides prior to LCMS: RXXp[ST] Curated Info
24	Beausoleil S (2010) CST Curation Set: 10287; Year: 2010; Biosample/Treatment: cell line, K-562/untreated; Disease: chronic myelogenous leukemia; SILAC: -; Specificities of Antibodies Used to Purify Peptides prior to LCMS: RXXp[ST] Curated Info
25	Zhou J (2010) CST Curation Set: 9672; Year: 2010; Biosample/Treatment: cell line, NCCIT/untreated; Disease: -; SILAC: -; Specificities of Antibodies Used to Purify Peptides prior to LCMS: RXXp[ST] Antibodies Used to Purify Peptides prior to LCMS: Phospho-(Ser/Thr) PKD Substrate Antibody Cat#: 4381, PTMScan(R) Phospho-PKD Substrate Motif (LXRXXpS/pT) Immunoaffinity Beads Cat#: 1986 Curated Info
26	Possemato A (2010) CST Curation Set: 9633; Year: 2010; Biosample/Treatment: cell line, Jurkat/calyculin_A & pervanadate; Disease: T cell leukemia; SILAC: -; Specificities of Antibodies Used to Purify Peptides prior to LCMS: RXXp[ST] Antibodies Used to Purify Peptides prior to LCMS: Phospho-Akt Substrate (RXRXXS/T) (110B7) Rabbit mAb Cat#: 9614 Curated Info
27	Possemato A (2010) CST Curation Set: 9635; Year: 2010; Biosample/Treatment: cell line, Jurkat/calyculin_A & pervanadate; Disease: T cell leukemia; SILAC: -; Specificities of Antibodies Used to Purify Peptides prior to LCMS: RXXp[ST] Antibodies Used to Purify Peptides prior to LCMS: Phospho-Akt Substrate (RXRXXS/T) (110B7) Rabbit mAb Cat#: 9614 Curated Info
28	Possemato A (2010) CST Curation Set: 9634; Year: 2010; Biosample/Treatment: cell line, Jurkat/calyculin_A & pervanadate; Disease: T cell leukemia; SILAC: -; Specificities of Antibodies Used to Purify Peptides prior to LCMS: RXXp[ST] Antibodies Used to Purify Peptides prior to LCMS: Phospho-Akt Substrate (RXRXXS/T) (110B7) Rabbit mAb Cat#: 9614 Curated Info
29	Possemato A (2010) CST Curation Set: 9632; Year: 2010; Biosample/Treatment: cell line, Jurkat/calyculin_A & pervanadate; Disease: T cell leukemia; SILAC: -; Specificities of Antibodies Used to Purify Peptides prior to LCMS: RXXp[ST] Antibodies Used to Purify Peptides prior to LCMS: Phospho-Akt Substrate (RXRXXS/T) (110B7) Rabbit mAb Cat#: 9614 Curated Info
30	Possemato A (2010) CST Curation Set: 9614; Year: 2010; Biosample/Treatment: cell line, Jurkat/calyculin_A & pervanadate; Disease: T cell leukemia; SILAC: -; Specificities of Antibodies Used to Purify Peptides prior to LCMS: RXXp[ST] Curated Info
31	Possemato A (2010) CST Curation Set: 9615; Year: 2010; Biosample/Treatment: cell line, Jurkat/calyculin_A & pervanadate; Disease: T cell leukemia; SILAC: -; Specificities of Antibodies Used to Purify Peptides prior to LCMS: RXXp[ST] Curated Info
32	Possemato A (2010) CST Curation Set: 9067; Year: 2010; Biosample/Treatment: cell line, Jurkat/calyculin_A & pervanadate; Disease: T cell leukemia; SILAC: -; Specificities of Antibodies Used to Purify Peptides prior to LCMS: (F/Y)XpS Curated Info
33	Possemato A (2010) CST Curation Set: 9073; Year: 2010; Biosample/Treatment: cell line, Jurkat/calyculin_A & pervanadate; Disease: T cell leukemia; SILAC: -; Specificities of Antibodies Used to Purify Peptides prior to LCMS: (F/Y)XpS Curated Info
34	Possemato A (2010) CST Curation Set: 9071; Year: 2010; Biosample/Treatment: cell line, Jurkat/calyculin_A & pervanadate; Disease: T cell leukemia; SILAC: -; Specificities of Antibodies Used to Purify Peptides prior to LCMS: (F/Y)XpS Curated Info
35	Possemato A (2010) CST Curation Set: 9051; Year: 2010; Biosample/Treatment: cell line, Jurkat/calyculin_A & pervanadate; Disease: T cell leukemia; SILAC: -; Specificities of Antibodies Used to Purify Peptides prior to LCMS: RXXp[ST] Antibodies Used to Purify Peptides prior to LCMS: Phospho-(Ser/Thr) PKD Substrate Antibody Cat#: 4381, PTMScan(R) Phospho-PKD Substrate Motif (LXRXXpS/pT) Immunoaffinity Beads Cat#: 1986 Curated Info
36	Possemato A (2010) CST Curation Set: 9052; Year: 2010; Biosample/Treatment: cell line, Jurkat/calyculin_A & pervanadate; Disease: T cell leukemia; SILAC: -; Specificities of Antibodies Used to Purify Peptides prior to LCMS: RXXp[ST] Antibodies Used to Purify Peptides prior to LCMS: Phospho-(Ser/Thr) PKD Substrate Antibody Cat#: 4381, PTMScan(R) Phospho-PKD Substrate Motif (LXRXXpS/pT) Immunoaffinity Beads Cat#: 1986 Curated Info
37	Possemato A (2010) CST Curation Set: 9055; Year: 2010; Biosample/Treatment: cell line, Jurkat/calyculin_A & pervanadate; Disease: T cell leukemia; SILAC: -; Specificities of Antibodies Used to Purify Peptides prior to LCMS: RXXp[ST] Antibodies Used to Purify Peptides prior to LCMS: Phospho-Akt Substrate (RXRXXS/T) (110B7) Rabbit mAb Cat#: 9614, PTMScan(R) Phospho-Akt Substrate Motif (RXXS/T) Immunoaffinity Beads Cat#: 1978 Curated Info
38	Possemato A (2010) CST Curation Set: 9047; Year: 2010; Biosample/Treatment: cell line, Jurkat/calyculin_A & pervanadate; Disease: T cell leukemia; SILAC: -; Specificities of Antibodies Used to Purify Peptides prior to LCMS: RXXp[ST] Antibodies Used to Purify Peptides prior to LCMS: Phospho-Akt Substrate (RXRXXS/T) (110B7) Rabbit mAb Cat#: 9614, PTMScan(R) Phospho-Akt Substrate Motif (RXXS/T) Immunoaffinity Beads Cat#: 1978 Curated Info
39	Possemato A (2009) CST Curation Set: 8352; Year: 2009; Biosample/Treatment: cell line, Jurkat/calyculin_A & pervanadate; Disease: T cell leukemia; SILAC: -; Specificities of Antibodies Used to Purify Peptides prior to LCMS: (K/R)XX[ST] Curated Info
40	Possemato A (2009) CST Curation Set: 8351; Year: 2009; Biosample/Treatment: cell line, Jurkat/calyculin_A & pervanadate; Disease: T cell leukemia; SILAC: -; Specificities of Antibodies Used to Purify Peptides prior to LCMS: (K/R)XX[ST] Curated Info
41	Possemato A (2009) CST Curation Set: 8361; Year: 2009; Biosample/Treatment: cell line, Jurkat/calyculin_A & pervanadate; Disease: T cell leukemia; SILAC: -; Specificities of Antibodies Used to Purify Peptides prior to LCMS: RXXp[ST] Antibodies Used to Purify Peptides prior to LCMS: Phospho-(Ser/Thr) PKD Substrate Antibody Cat#: 4381, PTMScan(R) Phospho-PKD Substrate Motif (LXRXXpS/pT) Immunoaffinity Beads Cat#: 1986 Curated Info
42	Possemato A (2009) CST Curation Set: 8362; Year: 2009; Biosample/Treatment: cell line, Jurkat/calyculin_A & pervanadate; Disease: T cell leukemia; SILAC: -; Specificities of Antibodies Used to Purify Peptides prior to LCMS: RXXp[ST] Antibodies Used to Purify Peptides prior to LCMS: Phospho-(Ser/Thr) PKD Substrate Antibody Cat#: 4381, PTMScan(R) Phospho-PKD Substrate Motif (LXRXXpS/pT) Immunoaffinity Beads Cat#: 1986 Curated Info
43	Possemato A (2009) CST Curation Set: 8363; Year: 2009; Biosample/Treatment: cell line, Jurkat/calyculin_A & pervanadate; Disease: T cell leukemia; SILAC: -; Specificities of Antibodies Used to Purify Peptides prior to LCMS: RXXp[ST] Antibodies Used to Purify Peptides prior to LCMS: Phospho-(Ser/Thr) PKD Substrate Antibody Cat#: 4381, PTMScan(R) Phospho-PKD Substrate Motif (LXRXXpS/pT) Immunoaffinity Beads Cat#: 1986 Curated Info
44	Oppermann FS, et al. (2009) Large-scale proteomics analysis of the human kinome. Mol Cell Proteomics 8, 1751-64 19369195 Curated Info
45	Possemato A (2009) CST Curation Set: 7266; Year: 2009; Biosample/Treatment: cell line, Jurkat/calyculin_A & pervanadate; Disease: T cell leukemia; SILAC: -; Specificities of Antibodies Used to Purify Peptides prior to LCMS: RXXp[ST] Antibodies Used to Purify Peptides prior to LCMS: Phospho-Akt Substrate (RXRXXS/T) (110B7) Rabbit mAb Cat#: 9614, PTMScan(R) Phospho-Akt Substrate Motif (RXXS/T) Immunoaffinity Beads Cat#: 1978 Curated Info
46	Possemato A (2009) CST Curation Set: 7265; Year: 2009; Biosample/Treatment: cell line, Jurkat/calyculin_A & pervanadate; Disease: T cell leukemia; SILAC: -; Specificities of Antibodies Used to Purify Peptides prior to LCMS: RXXp[ST] Antibodies Used to Purify Peptides prior to LCMS: Phospho-Akt Substrate (RXRXXS/T) (110B7) Rabbit mAb Cat#: 9614, PTMScan(R) Phospho-Akt Substrate Motif (RXXS/T) Immunoaffinity Beads Cat#: 1978 Curated Info
47	Possemato A (2009) CST Curation Set: 7267; Year: 2009; Biosample/Treatment: cell line, Jurkat/calyculin_A & pervanadate; Disease: T cell leukemia; SILAC: -; Specificities of Antibodies Used to Purify Peptides prior to LCMS: RXXp[ST] Curated Info
48	Possemato A (2009) CST Curation Set: 6913; Year: 2009; Biosample/Treatment: cell line, Jurkat/calyculin_A & pervanadate; Disease: T cell leukemia; SILAC: -; Specificities of Antibodies Used to Purify Peptides prior to LCMS: RXXp[ST] Antibodies Used to Purify Peptides prior to LCMS: Phospho-Akt Substrate (RXRXXS/T) (110B7) Rabbit mAb Cat#: 9614, PTMScan(R) Phospho-Akt Substrate Motif (RXXS/T) Immunoaffinity Beads Cat#: 1978 Curated Info
49	Possemato A (2009) CST Curation Set: 6894; Year: 2009; Biosample/Treatment: cell line, Jurkat/calyculin_A & pervanadate; Disease: T cell leukemia; SILAC: -; Specificities of Antibodies Used to Purify Peptides prior to LCMS: RXXp[ST] Antibodies Used to Purify Peptides prior to LCMS: Phospho-Akt Substrate (RXRXXS/T) (110B7) Rabbit mAb Cat#: 9614, PTMScan(R) Phospho-Akt Substrate Motif (RXXS/T) Immunoaffinity Beads Cat#: 1978 Curated Info
50	Possemato A (2009) CST Curation Set: 6895; Year: 2009; Biosample/Treatment: cell line, Jurkat/calyculin_A & pervanadate; Disease: T cell leukemia; SILAC: -; Specificities of Antibodies Used to Purify Peptides prior to LCMS: RXXp[ST] Antibodies Used to Purify Peptides prior to LCMS: Phospho-Akt Substrate (RXRXXS/T) (110B7) Rabbit mAb Cat#: 9614, PTMScan(R) Phospho-Akt Substrate Motif (RXXS/T) Immunoaffinity Beads Cat#: 1978 Curated Info
51	Mayya V, et al. (2009) Quantitative phosphoproteomic analysis of T cell receptor signaling reveals system-wide modulation of protein-protein interactions. Sci Signal 2, ra46 19690332 Curated Info
52	Wissing J, et al. (2007) Proteomics analysis of protein kinases by target class-selective prefractionation and tandem mass spectrometry. Mol Cell Proteomics 6, 537-47 17192257 Curated Info