spleen associated tyrosine kinase | Syk family | IUPHAR Guide to IMMUNOPHARMACOLOGY

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spleen associated tyrosine kinase

Target id: 2230

Nomenclature: spleen associated tyrosine kinase

Abbreviated Name: Syk

Family: Syk family

Annotation status:  image of an orange circle Annotated and awaiting review. Please contact us if you can help with reviewing.  » Email us

   GtoImmuPdb view: ON :     spleen associated tyrosine kinase has curated data in GtoImmuPdb

Gene and Protein Information
Species TM AA Chromosomal Location Gene Symbol Gene Name Reference
Human - 635 9q22 SYK spleen associated tyrosine kinase
Mouse - 629 13 B-C2 Syk spleen tyrosine kinase
Rat - 629 17 p14 Syk spleen associated tyrosine kinase
Previous and Unofficial Names
p72syk | Sykb
Database Links
Ensembl Gene
Entrez Gene
Human Protein Atlas
KEGG Enzyme
RefSeq Nucleotide
RefSeq Protein
Selected 3D Structures
Image of receptor 3D structure from RCSB PDB
Description:  Structural and biophysical characterization of the Syk activation switch.
PDB Id:  4FL2
Resolution:  2.19Å
Species:  Human
References:  11
Enzyme Reaction
EC Number:

Download all structure-activity data for this target as a CSV file

Key to terms and symbols View all chemical structures Click column headers to sort
Ligand Sp. Action Affinity Units Reference
tamatinib Hs Inhibition 7.7 pKd 8
pKd 7.7 (Kd 1.9x10-8 M) [8]
TAK-659 Hs Inhibition 8.0 pEC50 15
pEC50 8.0 (EC50 9.8x10-9 M) [15]
Description: Cellular potency
TAS05567 Hs Inhibition 9.4 pIC50 12
pIC50 9.4 (IC50 3.7x10-10 M) [12]
P505-15 Hs Inhibition 9.0 pIC50 6
pIC50 9.0 (IC50 1x10-9 M) [6]
TAK-659 Hs Inhibition 8.5 pIC50 15
pIC50 8.5 (IC50 3.2x10-9 M) [15]
Description: Enzyme inhibition in vitro.
compound 23 [PMID: 17600705] Hs Inhibition 8.4 pIC50 2
pIC50 8.4 (IC50 4x10-9 M) [2]
GSK143 Hs Inhibition 8.1 pIC50 17
pIC50 8.1 (IC50 7.5x10-9 M) [17]
Description: Enzyme inhibition assay using recombinant human protein
entospletinib Hs Inhibition 8.1 pIC50 7
pIC50 8.1 (IC50 7.7x10-9 M) [7]
example 2 [US9290505] Hs Inhibition 7.9 pIC50 3
pIC50 7.9 (IC50 1.35x10-8 M) [3]
Syk inhibitor Hs Inhibition 7.8 pIC50 14
pIC50 7.8 (IC50 1.4x10-8 M) [14]
Description: Assayed using N-Flag tagged catalytic domain of human SYK (Ala340-Asn635)
BAY 61-3606 Hs Inhibition 7.6 pIC50 16
pIC50 7.6 (IC50 2.55x10-8 M) [16]
tamatinib Hs Inhibition 7.4 – 7.8 pIC50 4,18,26
pIC50 7.8 (IC50 1.7x10-8 M) [18]
Description: Measuring inhibition of the capacity of a truncated construct of Syk (aa 360-635) to phosphorylate a biotinylated peptide substrate.
pIC50 7.4 – 7.5 (IC50 4.1x10-8 – 3x10-8 M) [4,26]
cerdulatinib Hs Inhibition 7.5 pIC50 5
pIC50 7.5 (IC50 3.2x10-8 M) [5]
Syk inhibitor II Hs Inhibition 7.4 pIC50 13
pIC50 7.4 (IC50 4.1x10-8 M) [13]
apitolisib Hs Inhibition 6.9 pIC50 23
pIC50 6.9 (IC50 1.34x10-7 M) [23]
compound 7 [PMID: 22464456] Hs Inhibition 6.4 pIC50 19
pIC50 6.4 (IC50 3.582x10-7 M) [19]
Syk inhibitor III Hs Inhibition 5.6 pIC50 24
pIC50 5.6 (IC50 2.8x10-6 M) [24]
ER-27319 Hs Inhibition 5.0 pIC50 22
pIC50 5.0 (IC50 1x10-5 M) [22]
Description: Inhibition of Syk in human mast cells by immunoprecipitation assay
DiscoveRx KINOMEscan® screen
A screen of 72 inhibitors against 456 human kinases. Quantitative data were derived using DiscoveRx KINOMEscan® platform.
Reference: 8,25

Key to terms and symbols Click column headers to sort
Target used in screen: SYK
Ligand Sp. Type Action Affinity Units
lestaurtinib Hs Inhibitor Inhibition 8.0 pKd
staurosporine Hs Inhibitor Inhibition 7.8 pKd
tamatinib Hs Inhibitor Inhibition 7.7 pKd
midostaurin Hs Inhibitor Inhibition 7.1 pKd
foretinib Hs Inhibitor Inhibition 6.6 pKd
bosutinib Hs Inhibitor Inhibition 6.5 pKd
PD-173955 Hs Inhibitor Inhibition 6.4 pKd
AST-487 Hs Inhibitor Inhibition 6.2 pKd
KW-2449 Hs Inhibitor Inhibition 6.2 pKd
NVP-TAE684 Hs Inhibitor Inhibition 5.9 pKd
Displaying the top 10 most potent ligands  View all ligands in screen »
EMD Millipore KinaseProfilerTM screen/Reaction Biology Kinase HotspotSM screen
A screen profiling 158 kinase inhibitors (Calbiochem Protein Kinase Inhibitor Library I and II, catalogue numbers 539744 and 539745) for their inhibitory activity at 1µM and 10µM against 234 human recombinant kinases using the EMD Millipore KinaseProfilerTM service.

A screen profiling the inhibitory activity of 178 commercially available kinase inhibitors at 0.5µM against a panel of 300 recombinant protein kinases using the Reaction Biology Corporation Kinase HotspotSM platform.


Reference: 1,9

Key to terms and symbols Click column headers to sort
Target used in screen: Syk/SYK
Ligand Sp. Type Action % Activity remaining at 0.5µM % Activity remaining at 1µM % Activity remaining at 10µM
staurosporine Hs Inhibitor Inhibition 4.7 1.0 0.5
K-252a Hs Inhibitor Inhibition 6.0 1.0 2.0
Gö 6976 Hs Inhibitor Inhibition 14.6 3.0 5.0
Cdk1/2 inhibitor III Hs Inhibitor Inhibition 15.5 16.0 3.0
Syk inhibitor II Hs Inhibitor Inhibition 15.6 6.0 0.0
SB 218078 Hs Inhibitor Inhibition 15.8 90.0 80.0
Syk inhibitor Hs Inhibitor Inhibition 16.5 38.0 28.0
midostaurin Hs Inhibitor Inhibition 16.8 2.0 3.0
bosutinib Hs Inhibitor Inhibition 21.1
TWS119 Hs Inhibitor Inhibition 36.1 18.0 3.0
Displaying the top 10 most potent ligands  View all ligands in screen »


Show »

1. Anastassiadis T, Deacon SW, Devarajan K, Ma H, Peterson JR. (2011) Comprehensive assay of kinase catalytic activity reveals features of kinase inhibitor selectivity. Nat. Biotechnol., 29 (11): 1039-45. [PMID:22037377]

2. Bamborough P, Angell RM, Bhamra I, Brown D, Bull J, Christopher JA, Cooper AW, Fazal LH, Giordano I, Hind L et al.. (2007) N-4-Pyrimidinyl-1H-indazol-4-amine inhibitors of Lck: indazoles as phenol isosteres with improved pharmacokinetics. Bioorg. Med. Chem. Lett., 17 (15): 4363-8. [PMID:17600705]

3. Blomgren P, Currie KS, Kropf JE, Lee SH, Lo JR, Mitchell SA, Schmitt AC, Xiong J-M, Xu J, Zhao Z et al.. (2016) Substituted imidazo[1,2-a]pyrazines as Syk inhibitors. Patent number: US9290505. Assignee: Gilead Sciences, Inc.. Priority date: 23/12/2013. Publication date: 22/03/2016.

4. Braselmann S, Taylor V, Zhao H, Wang S, Sylvain C, Baluom M, Qu K, Herlaar E, Lau A, Young C et al.. (2006) R406, an orally available spleen tyrosine kinase inhibitor blocks fc receptor signaling and reduces immune complex-mediated inflammation. J. Pharmacol. Exp. Ther., 319 (3): 998-1008. [PMID:16946104]

5. Coffey G, Betz A, DeGuzman F, Pak Y, Inagaki M, Baker DC, Hollenbach SJ, Pandey A, Sinha U. (2014) The novel kinase inhibitor PRT062070 (Cerdulatinib) demonstrates efficacy in models of autoimmunity and B-cell cancer. J. Pharmacol. Exp. Ther., 351 (3): 538-48. [PMID:25253883]

6. Coffey G, DeGuzman F, Inagaki M, Pak Y, Delaney SM, Ives D, Betz A, Jia ZJ, Pandey A, Baker D et al.. (2012) Specific inhibition of spleen tyrosine kinase suppresses leukocyte immune function and inflammation in animal models of rheumatoid arthritis. J. Pharmacol. Exp. Ther., 340 (2): 350-9. [PMID:22040680]

7. Currie KS, Kropf JE, Lee T, Blomgren P, Xu J, Zhao Z, Gallion S, Whitney JA, Maclin D, Lansdon EB et al.. (2014) Discovery of GS-9973, a selective and orally efficacious inhibitor of spleen tyrosine kinase. J. Med. Chem., 57 (9): 3856-73. [PMID:24779514]

8. Davis MI, Hunt JP, Herrgard S, Ciceri P, Wodicka LM, Pallares G, Hocker M, Treiber DK, Zarrinkar PP. (2011) Comprehensive analysis of kinase inhibitor selectivity. Nat. Biotechnol., 29 (11): 1046-51. [PMID:22037378]

9. Gao Y, Davies SP, Augustin M, Woodward A, Patel UA, Kovelman R, Harvey KJ. (2013) A broad activity screen in support of a chemogenomic map for kinase signalling research and drug discovery. Biochem. J., 451 (2): 313-28. [PMID:23398362]

10. Ghosh D, Tsokos GC. (2010) Spleen tyrosine kinase: an Src family of non-receptor kinase has multiple functions and represents a valuable therapeutic target in the treatment of autoimmune and inflammatory diseases. Autoimmunity, 43 (1): 48-55. [PMID:20001666]

11. Grädler U, Schwarz D, Dresing V, Musil D, Bomke J, Frech M, Greiner H, Jäkel S, Rysiok T, Müller-Pompalla D et al.. (2013) Structural and biophysical characterization of the Syk activation switch. J. Mol. Biol., 425 (2): 309-33. [PMID:23154170]

12. Hayashi H, Kaneko R, Demizu S, Akasaka D, Tayama M, Harada T, Irie H, Ogino Y, Fujino N, Sasaki E. (2018) TAS05567, a Novel Potent and Selective Spleen Tyrosine Kinase Inhibitor, Abrogates Immunoglobulin-Mediated Autoimmune and Allergic Reactions in Rodent Models. J. Pharmacol. Exp. Ther., 366 (1): 84-95. DOI: 10.1124/jpet.118.248153 [PMID:29728446]

13. Hisamichi H, Naito R, Toyoshima A, Kawano N, Ichikawa A, Orita A, Orita M, Hamada N, Takeuchi M, Ohta M et al.. (2005) Synthetic studies on novel Syk inhibitors. Part 1: Synthesis and structure-activity relationships of pyrimidine-5-carboxamide derivatives. Bioorg. Med. Chem., 13 (16): 4936-51. [PMID:15990316]

14. Lai JY, Cox PJ, Patel R, Sadiq S, Aldous DJ, Thurairatnam S, Smith K, Wheeler D, Jagpal S, Parveen S et al.. (2003) Potent small molecule inhibitors of spleen tyrosine kinase (Syk). Bioorg. Med. Chem. Lett., 13 (18): 3111-4. [PMID:12941345]

15. Lam B, Arikawa Y, Cramlett J, Dong Q, de Jong R, Feher V, Grimshaw CE, Farrell PJ, Hoffman ID, Jennings A et al.. (2016) Discovery of TAK-659 an orally available investigational inhibitor of Spleen Tyrosine Kinase (SYK). Bioorg. Med. Chem. Lett., 26 (24): 5947-5950. [PMID:27839918]

16. Lau KS, Zhang T, Kendall KR, Lauffenburger D, Gray NS, Haigis KM. (2012) BAY61-3606 affects the viability of colon cancer cells in a genotype-directed manner. PLoS ONE, 7 (7): e41343. [PMID:22815993]

17. Liddle J, Atkinson FL, Barker MD, Carter PS, Curtis NR, Davis RP, Douault C, Dickson MC, Elwes D, Garton NS et al.. (2011) Discovery of GSK143, a highly potent, selective and orally efficacious spleen tyrosine kinase inhibitor. Bioorg. Med. Chem. Lett., 21 (20): 6188-94. [PMID:21903390]

18. Lucas MC, Goldstein DM, Hermann JC, Kuglstatter A, Liu W, Luk KC, Padilla F, Slade M, Villaseñor AG, Wanner J et al.. (2012) Rational design of highly selective spleen tyrosine kinase inhibitors. J. Med. Chem., 55 (23): 10414-23. [PMID:23151054]

19. McLean LR, Zhang Y, Zaidi N, Bi X, Wang R, Dharanipragada R, Jurcak JG, Gillespy TA, Zhao Z, Musick KY et al.. (2012) X-ray crystallographic structure-based design of selective thienopyrazole inhibitors for interleukin-2-inducible tyrosine kinase. Bioorg. Med. Chem. Lett., 22 (9): 3296-300. [PMID:22464456]

20. Newland A, Lee EJ, McDonald V, Bussel JB. (2018) Fostamatinib for persistent/chronic adult immune thrombocytopenia. Immunotherapy, 10 (1): 9-25. [PMID:28967793]

21. Riccaboni M, Bianchi I, Petrillo P. (2010) Spleen tyrosine kinases: biology, therapeutic targets and drugs. Drug Discov. Today, 15 (13-14): 517-30. [PMID:20553955]

22. Singh R, Masuda ES, Payan DG. (2012) Discovery and development of spleen tyrosine kinase (SYK) inhibitors. J. Med. Chem., 55 (8): 3614-43. [PMID:22257213]

23. Sutherlin DP, Bao L, Berry M, Castanedo G, Chuckowree I, Dotson J, Folks A, Friedman L, Goldsmith R, Gunzner J et al.. (2011) Discovery of a potent, selective, and orally available class I phosphatidylinositol 3-kinase (PI3K)/mammalian target of rapamycin (mTOR) kinase inhibitor (GDC-0980) for the treatment of cancer. J. Med. Chem., 54 (21): 7579-87. [PMID:21981714]

24. Wang WY, Hsieh PW, Wu YC, Wu CC. (2007) Synthesis and pharmacological evaluation of novel beta-nitrostyrene derivatives as tyrosine kinase inhibitors with potent antiplatelet activity. Biochem. Pharmacol., 74 (4): 601-11. [PMID:17601492]

25. Wodicka LM, Ciceri P, Davis MI, Hunt JP, Floyd M, Salerno S, Hua XH, Ford JM, Armstrong RC, Zarrinkar PP et al.. (2010) Activation state-dependent binding of small molecule kinase inhibitors: structural insights from biochemistry. Chem. Biol., 17 (11): 1241-9. [PMID:21095574]

26. Xie HZ, Li LL, Ren JX, Zou J, Yang L, Wei YQ, Yang SY. (2009) Pharmacophore modeling study based on known spleen tyrosine kinase inhibitors together with virtual screening for identifying novel inhibitors. Bioorg. Med. Chem. Lett., 19 (7): 1944-9. [PMID:19254842]

How to cite this page

Syk family: spleen associated tyrosine kinase. Last modified on 07/05/2018. Accessed on 20/01/2019. IUPHAR/BPS Guide to PHARMACOLOGY, http://guidetoimmunopharmacology.org/GRAC/ObjectDisplayForward?objectId=2230.