Details of the Drug Therapeutic Target (DTT)

General Information of Drug Therapeutic Target (DTT) (ID: TTG84D3)

• DTT Name: Ephrin type-A receptor 4 (EPHA4)
• Synonyms: hEK8; Tyrosineprotein kinase receptor SEK; Tyrosineprotein kinase TYRO1; Tyrosine-protein kinase receptor SEK; Tyrosine-protein kinase TYRO1; TYRO1; SEK; Ephrin typeA receptor 4; EPHlike kinase 8; EPH-like kinase 8; EK8
• Gene Name: EPHA4
• DTT Type: Literature-reported target; [1]
• BioChemical Class: Kinase
• UniProt ID: EPHA4_HUMAN
• TTD ID: T70234
• EC Number: EC 2.7.10.1
• Sequence:
  MAGIFYFALFSCLFGICDAVTGSRVYPANEVTLLDSRSVQGELGWIASPLEGGWEEVSIM
  DEKNTPIRTYQVCNVMEPSQNNWLRTDWITREGAQRVYIEIKFTLRDCNSLPGVMGTCKE
  TFNLYYYESDNDKERFIRENQFVKIDTIAADESFTQVDIGDRIMKLNTEIRDVGPLSKKG
  FYLAFQDVGACIALVSVRVFYKKCPLTVRNLAQFPDTITGADTSSLVEVRGSCVNNSEEK
  DVPKMYCGADGEWLVPIGNCLCNAGHEERSGECQACKIGYYKALSTDATCAKCPPHSYSV
  WEGATSCTCDRGFFRADNDAASMPCTRPPSAPLNLISNVNETSVNLEWSSPQNTGGRQDI
  SYNVVCKKCGAGDPSKCRPCGSGVHYTPQQNGLKTTKVSITDLLAHTNYTFEIWAVNGVS
  KYNPNPDQSVSVTVTTNQAAPSSIALVQAKEVTRYSVALAWLEPDRPNGVILEYEVKYYE
  KDQNERSYRIVRTAARNTDIKGLNPLTSYVFHVRARTAAGYGDFSEPLEVTTNTVPSRII
  GDGANSTVLLVSVSGSVVLVVILIAAFVISRRRSKYSKAKQEADEEKHLNQGVRTYVDPF
  TYEDPNQAVREFAKEIDASCIKIEKVIGVGEFGEVCSGRLKVPGKREICVAIKTLKAGYT
  DKQRRDFLSEASIMGQFDHPNIIHLEGVVTKCKPVMIITEYMENGSLDAFLRKNDGRFTV
  IQLVGMLRGIGSGMKYLSDMSYVHRDLAARNILVNSNLVCKVSDFGMSRVLEDDPEAAYT
  TRGGKIPIRWTAPEAIAYRKFTSASDVWSYGIVMWEVMSYGERPYWDMSNQDVIKAIEEG
  YRLPPPMDCPIALHQLMLDCWQKERSDRPKFGQIVNMLDKLIRNPNSLKRTGTESSRPNT
  ALLDPSSPEFSAVVSVGDWLQAIKMDRYKDNFTAAGYTTLEAVVHVNQEDLARIGITAIT
  HQNKILSSVQAMRTQMQQMHGRMVPV
• 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. Highly promiscuous, it has the unique property among Eph receptors to bind and to be physiologically activated by both GPI-anchored ephrin-A and transmembrane ephrin-B ligands including EFNA1 and EFNB3. Upon activation by ephrin ligands, modulates cell morphology and integrin-dependent cell adhesion through regulation of the Rac, Rap and Rho GTPases activity. Plays an important role in the development of the nervous system controlling different steps of axonal guidance including the establishment of the corticospinal projections. May also control the segregation of motor and sensory axons during neuromuscular circuit development. In addition to its role in axonal guidance plays a role in synaptic plasticity. Activated by EFNA1 phosphorylates CDK5 at 'Tyr-15' which in turn phosphorylates NGEF regulating RHOA and dendritic spine morphogenesis. In the nervous system, plays also a role in repair after injury preventing axonal regeneration and in angiogenesis playing a role in central nervous system vascular formation. Additionally, its promiscuity makes it available to participate in a variety of cell-cell signaling regulating for instance the development of the thymic epithelium. Receptor tyrosine kinase which binds membrane-bound ephrin family ligands residing on adjacent cells, leading to contact-dependent bidirectional signaling into neighboring cells.
• KEGG Pathway: Axon guidance (hsa04360)
• Reactome Pathway:
  EPHA-mediated growth cone collapse (R-HSA-3928663)
  EPH-ephrin mediated repulsion of cells (R-HSA-3928665)
  EPH-Ephrin signaling (R-HSA-2682334)

Molecular Interaction Atlas (MIA) of This DTT

1 Discontinued Drug(s) Targeting This DTT

Drug Name	Drug ID	Indication	ICD 11	Highest Status	REF
MEDI-542	DM4G0D5	Solid tumour/cancer	2A00-2F9Z	Terminated	[1]

2 Investigative Drug(s) Targeting This DTT

Drug Name	Drug ID	Indication	ICD 11	Highest Status	REF
PMID19788238C66	DMCVJK9	Discovery agent	N.A.	Investigative	[2]
PMID23489211C20	DMDYC4J	Discovery agent	N.A.	Investigative	[3]

References

• [1] Product Pipeline Review of MedImmune, LLC in 2012.
• [2] 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.
• [3] Amino acid conjugates of lithocholic acid as antagonists of the EphA2 receptor. J Med Chem. 2013 Apr 11;56(7):2936-47.