Details of the Drug Therapeutic Target (DTT)

General Information of Drug Therapeutic Target (DTT) (ID: TT5LM7U)

• DTT Name: Ephrin type-B receptor 3 (EPHB3)
• Synonyms: hEK2; Tyrosine-protein kinase TYRO6; TYRO6; Embryonic kinase 2; ETK2; EPH-like tyrosine kinase 2; EPH-like kinase 2; EK2
• Gene Name: EPHB3
• DTT Type: Literature-reported target; [1]
• BioChemical Class: Kinase
• UniProt ID: EPHB3_HUMAN
• TTD ID: T56121
• EC Number: EC 2.7.10.1
• Sequence:
  MARARPPPPPSPPPGLLPLLPPLLLLPLLLLPAGCRALEETLMDTKWVTSELAWTSHPES
  GWEEVSGYDEAMNPIRTYQVCNVRESSQNNWLRTGFIWRRDVQRVYVELKFTVRDCNSIP
  NIPGSCKETFNLFYYEADSDVASASSPFWMENPYVKVDTIAPDESFSRLDAGRVNTKVRS
  FGPLSKAGFYLAFQDQGACMSLISVRAFYKKCASTTAGFALFPETLTGAEPTSLVIAPGT
  CIPNAVEVSVPLKLYCNGDGEWMVPVGACTCATGHEPAAKESQCRPCPPGSYKAKQGEGP
  CLPCPPNSRTTSPAASICTCHNNFYRADSDSADSACTTVPSPPRGVISNVNETSLILEWS
  EPRDLGGRDDLLYNVICKKCHGAGGASACSRCDDNVEFVPRQLGLTERRVHISHLLAHTR
  YTFEVQAVNGVSGKSPLPPRYAAVNITTNQAAPSEVPTLRLHSSSGSSLTLSWAPPERPN
  GVILDYEMKYFEKSEGIASTVTSQMNSVQLDGLRPDARYVVQVRARTVAGYGQYSRPAEF
  ETTSERGSGAQQLQEQLPLIVGSATAGLVFVVAVVVIAIVCLRKQRHGSDSEYTEKLQQY
  IAPGMKVYIDPFTYEDPNEAVREFAKEIDVSCVKIEEVIGAGEFGEVCRGRLKQPGRREV
  FVAIKTLKVGYTERQRRDFLSEASIMGQFDHPNIIRLEGVVTKSRPVMILTEFMENCALD
  SFLRLNDGQFTVIQLVGMLRGIAAGMKYLSEMNYVHRDLAARNILVNSNLVCKVSDFGLS
  RFLEDDPSDPTYTSSLGGKIPIRWTAPEAIAYRKFTSASDVWSYGIVMWEVMSYGERPYW
  DMSNQDVINAVEQDYRLPPPMDCPTALHQLMLDCWVRDRNLRPKFSQIVNTLDKLIRNAA
  SLKVIASAQSGMSQPLLDRTVPDYTTFTTVGDWLDAIKMGRYKESFVSAGFASFDLVAQM
  TAEDLLRIGVTLAGHQKKILSSIQDMRLQMNQTLPVQV
• Function: The signaling pathway downstream of the receptor is referred to as forward signaling while the signaling pathway downstream of the ephrin ligand is referred to as reverse signaling. Generally has an overlapping and redundant function with EPHB2. Like EPHB2, functions in axon guidance during development regulating for instance the neurons forming the corpus callosum and the anterior commissure, 2 major interhemispheric connections between the temporal lobes of the cerebral cortex. In addition to its role in axon guidance plays also an important redundant role with other ephrin-B receptors in development and maturation of dendritic spines and the formation of excitatory synapses. Controls other aspects of development through regulation of cell migration and positioning. This includes angiogenesis, palate development and thymic epithelium development for instance. Forward and reverse signaling through the EFNB2/EPHB3 complex also regulate migration and adhesion of cells that tubularize the urethra and septate the cloaca. Finally, plays an important role in intestinal epithelium differentiation segregating progenitor from differentiated cells in the crypt. Receptor tyrosine kinase which binds promiscuously transmembrane ephrin-B family ligands residing on adjacent cells, leading to contact-dependent bidirectional signaling into neighboring cells.
• KEGG Pathway: Axon guidance (hsa04360)
• Reactome Pathway:
  EPHB-mediated forward signaling (R-HSA-3928662)
  Ephrin signaling (R-HSA-3928664)
  EPH-ephrin mediated repulsion of cells (R-HSA-3928665)
  EPH-Ephrin signaling (R-HSA-2682334)

Molecular Interaction Atlas (MIA) of This DTT

2 Investigative Drug(s) Targeting This DTT

Drug Name	Drug ID	Indication	ICD 11	Highest Status	REF
PMID19788238C66	DMCVJK9	Discovery agent	N.A.	Investigative	[1]
PMID23489211C20	DMDYC4J	Discovery agent	N.A.	Investigative	[2]

References

• [1] Structure-based optimization of potent and selective inhibitors of the tyrosine kinase erythropoietin producing human hepatocellular carcinoma receptor B4 (EphB4). J Med Chem. 2009 Oct 22;52(20):6433-46.
• [2] Amino acid conjugates of lithocholic acid as antagonists of the EphA2 receptor. J Med Chem. 2013 Apr 11;56(7):2936-47.