MammalianJaggedproteinsarehomologsoftheDrosophilaNotchligand,Serrate,andtogetherwithDelta-likeproteins,constituteligandsforthemammalianNotchproteins.Jagged1and2are180kDaand150kDatypeItransmembraneglycoproteins,respectively,thatpossessextracellularDSL(delta,serrate,lag-2consensussequence)domainsnecessaryforbindingtoNotchreceptors,alongwith15-16calcium-bindingEGF-likerepeatswhichmodulatethebindingaffinity.Jagged-Notchsignalingspecifiescellfate,regulatespatternformation,definesboundariesbetweendifferentcelltypes,andmodulatescellproliferationanddifferentiation,especiallyduringhematopoiesis,myogenesis,neurogenesisanddevelopmentofthevasculature.Sinceboththeligandsandreceptorsaretransmembraneproteins,directcell-cellinteractionsarethoughttoberequiredforfunctionalNotchsignaling.
Image:Jagged1stainingofparaffin-embeddedhumankidneycancer.HRP-DABreagents(browncolor)wereusedforthedetectionand counterstainedusinghematoxylin(blue).
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