#$%^&*AU2015201410B220161103.pdf#####H:\rbr\Interwoven\NRPortbI\DCC\RBR\7513411 L.docx-3/03/2015 Abstract The present invention relates to novel protein modulators capable of altering function of the mutant CFTR protein and their use for treating diseases associated with CFTR protein malfunction. The invention provides compositions, pharmaceutical preparations and methods 5 of correcting the cellular alteration of a mutant CFTR protein wherein the CFTR mutation is a mutation AF508-CFTR, or another mutation of class II.