BackgroundInformation | EPHandEPH-relatedreceptorshavebeenimplicatedinmediatingdevelopmentalevents,particularlyinthenervoussystem.ReceptorsintheEPHsubfamilytypicallyhaveasinglekinasedomainandanextracellularregioncontainingaCys-richdomainand2fibronectintypeIIIrepeats.Theephrinreceptorsaredividedinto2groupsbasedonthesimilarityoftheirextracellulardomainsequencesandtheiraffinitiesforbindingephrin-Aandephrin-Bligands. Proteinkinasesareenzymesthattransferaphosphategroupfromaphosphatedonor,generallythegphosphateofATP,ontoanacceptoraminoacidinasubstrateprotein.Bythisbasicmechanism,proteinkinasesmediatemostofthesignaltransductionineukaryoticcells,regulatingcellularmetabolism,transcription,cellcycleprogression,cytoskeletalrearrangementandcellmovement,apoptosis,anddifferentiation. |