| Cell junction associated proteins IQGAP 1 , MAGI 2 , CASK , spectrins , and alpha actinin are components of the nephrin multiprotein complex . ^^^ Nephrin specifically pulled down six proteins from glomerular lysates , MAGI 2 / S SCAM ( membrane associated guanylate kinase inverted 2 / synaptic scaffolding molecule ) , IQGAP 1 ( IQ motif containingGTPase activatingprotein 1 ) , CASK ( calcium / calmodulin dependent serine protein kinase ) , alpha actinin , alphaII spectrin , and betaII spectrin . ^^^ |