Dipeptidyl peptidase-IV (DPP-IV) inhibitors are poised to be the next major drug class for the treatment of type 2 diabetes. Structure-activity studies of substitutions at the C5 position of the 2-cyanopyrrolidide warhead led to the discovery of potent inhibitors of DPP-IV that lack activity against DPP8 and DPP9. Further modification led to an extremely potent (Ki(DPP)(-)(IV) = 1.0 nM) and selective (Ki(DPP8) > 30 microM; Ki(DPP9) > 30 microM) clinical candidate, ABT-279, that is orally available, efficacious, and remarkably safe in preclinical safety studies.
        
Representative scheme of DPP4N_Peptidase_S9 structure and an image from PDBsum server
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Databases
PDB-Sum
2I03 Previously Class, Architecture, Topology and Homologous superfamily - PDB-Sum server
FSSP
2I03Fold classification based on Structure-Structure alignment of Proteins - FSSP server