Thesecretedpolypeptidenoggin,encodedbytheNOGgene,bindsandinactivatesmembersofthetransforminggrowthfactor-beta(TGF-beta)superfamilysignalingproteins,suchasbonemorphogeneticprotein-4(BMP4).BydiffusingthroughextracellularmatricesmoreefficientlythanmembersoftheTGF-betasuperfamily,nogginmayhaveaprincipalroleincreatingmorphogenicgrADIents.Nogginappearstohavepleiotropiceffect,bothearlyindevelopmentaswellasinlaterstages.ItwasoriginallyisolatedfromXenopusbasedonitsABIlitytorestorenormaldorsal-ventralbodyaxisinembryosthathadbeenartificiallyventralizedbyUVtreatment.Theresultsofthemouseknockoutofnogginsuggestthatitisinvolvedinnumerousdevelopmentalprocesses,suchasneuraltubefusionandjointformation.Recently,severaldominanthumanNOGmutationsinunrelatedfamilieswithproximalsymphalangism(SYM1)andmultiplesynostosessyndrome(SYNS1)wereidentified;bothSYM1andSYNS1havemultiplejointfusionastheirprincipalfeature,andmaptothesameregion(17q22)asNOG.AllNOGmutationsalteredevolutionarilyconservedaminoacidresidues.TheaminoacidsequenceofhumannogginishighlyhomologoustothatofXenopus,ratandmouse.
BIOLOGicalActivity:
TheED50,calculatedbytheabilitytoinhibit5ng/mlofBMP-4inducedalkalinephosphataseproductionbyATCD-5chondrogeniccells<0.06µg/ml.
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