Klei HE

References (4)

Title : Optimization of Activity, Selectivity, and Liability Profiles in 5-Oxopyrrolopyridine DPP4 Inhibitors Leading to Clinical Candidate (Sa)-2-(3-(Aminomethyl)-4-(2,4-dichlorophenyl)-2-methyl-5-oxo-5H-pyrrolo[3,4-b]py ridin-6(7H)-yl)-N,N-dimethylacetamide (BMS-767778) - Devasthale_2013_J.Med.Chem_56_7343
Author(s) : Devasthale P , Wang Y , Wang W , Fevig J , Feng J , Wang A , Harrity T , Egan D , Morgan N , Cap M , Fura A , Klei HE , Kish K , Weigelt C , Sun L , Levesque P , Moulin F , Li YX , Zahler R , Kirby MS , Hamann LG
Ref : Journal of Medicinal Chemistry , 56 :7343 , 2013
Abstract : Optimization of a 5-oxopyrrolopyridine series based upon structure-activity relationships (SARs) developed from our previous efforts on a number of related bicyclic series yielded compound 2s (BMS-767778) with an overall activity, selectivity, efficacy, PK, and developability profile suitable for progression into the clinic. SAR in the series and characterization of 2s are described.
ESTHER : Devasthale_2013_J.Med.Chem_56_7343
PubMedSearch : Devasthale_2013_J.Med.Chem_56_7343
PubMedID: 23964740
Gene_locus related to this paper: human-DPP4

Title : 7-Oxopyrrolopyridine-derived DPP4 inhibitors-mitigation of CYP and hERG liabilities via introduction of polar functionalities in the active site - Wang_2011_Bioorg.Med.Chem.Lett_21_6646
Author(s) : Wang W , Devasthale P , Wang A , Harrity T , Egan D , Morgan N , Cap M , Fura A , Klei HE , Kish K , Weigelt C , Sun L , Levesque P , Li YX , Zahler R , Kirby MS , Hamann LG
Ref : Bioorganic & Medicinal Chemistry Lett , 21 :6646 , 2011
Abstract : Design, synthesis, and SAR of 7-oxopyrrolopyridine-derived DPP4 inhibitors are described. The preferred stereochemistry of these atropisomeric biaryl analogs has been identified as Sa. Compound (+)-3t, with a K(i) against DPP4, DPP8, and DPP9 of 0.37 nM, 2.2, and 5.7 muM, respectively, showed a significant improvement in insulin response after single doses of 3 and 10 mumol/kg in ob/ob mice.
ESTHER : Wang_2011_Bioorg.Med.Chem.Lett_21_6646
PubMedSearch : Wang_2011_Bioorg.Med.Chem.Lett_21_6646
PubMedID: 21996520
Gene_locus related to this paper: human-DPP4

Title : Discovery of 6-(Aminomethyl)-5-(2,4-dichlorophenyl)-7-methylimidazo[1,2-a]pyrimidine-2-carboxa mides as Potent, Selective Dipeptidyl Peptidase-4 (DPP4) Inhibitors - Meng_2010_J.Med.Chem_53_5620
Author(s) : Meng W , Brigance RP , Chao HJ , Fura A , Harrity T , Marcinkeviciene J , O'Connor SP , Tamura JK , Xie D , Zhang Y , Klei HE , Kish K , Weigelt CA , Turdi H , Wang A , Zahler R , Kirby MS , Hamann LG
Ref : Journal of Medicinal Chemistry , 53 :5620 , 2010
Abstract : Continued structure-activity relationship (SAR) exploration within our previously disclosed azolopyrimidine containing dipeptidyl peptidase-4 (DPP4) inhibitors led us to focus on an imidazolopyrimidine series in particular. Further study revealed that by replacing the aryl substitution on the imidazole ring with a more polar carboxylic ester or amide, these compounds displayed not only increased DPP4 binding activity but also significantly reduced human ether-a-go-go related gene (hERG) and sodium channel inhibitory activities. Additional incremental adjustment of polarity led to permeable molecules which exhibited favorable pharmacokinetic (PK) profiles in preclinical animal species. The active site binding mode of these compounds was determined by X-ray crystallography as exemplified by amide 24c. A subsequent lead molecule from this series, (+)-6-(aminomethyl)-5-(2,4-dichlorophenyl)-N-(1-ethyl-1H-pyrazol-5-yl)-7-methylimidazo[1,2-a]pyrimidine-2-carboxamide (24s), emerged as a potent, selective DPP4 inhibitor that displayed excellent PK profiles and in vivo efficacy in ob/ob mice.
ESTHER : Meng_2010_J.Med.Chem_53_5620
PubMedSearch : Meng_2010_J.Med.Chem_53_5620
PubMedID: 20684603
Gene_locus related to this paper: human-DPP4

Title : Involvement of DPP-IV catalytic residues in enzyme-saxagliptin complex formation - Metzler_2008_Protein.Sci_17_240
Author(s) : Metzler WJ , Yanchunas J , Weigelt C , Kish K , Klei HE , Xie D , Zhang Y , Corbett M , Tamura JK , He B , Hamann LG , Kirby MS , Marcinkeviciene J
Ref : Protein Science , 17 :240 , 2008
Abstract : The inhibition of DPP-IV by saxagliptin has been proposed to occur through formation of a covalent but reversible complex. To evaluate further the mechanism of inhibition, we determined the X-ray crystal structure of the DPP-IV:saxagliptin complex. This structure reveals covalent attachment between S630 and the inhibitor nitrile carbon (C-O distance <1.3 A). To investigate whether this serine addition is assisted by the catalytic His-Asp dyad, we generated two mutants of DPP-IV, S630A and H740Q, and assayed them for ability to bind inhibitor. DPP-IV H740Q bound saxagliptin with an approximately 1000-fold reduction in affinity relative to DPP-IV WT, while DPP-IV S630A showed no evidence for binding inhibitor. An analog of saxagliptin lacking the nitrile group showed unchanged binding properties to the both mutant proteins, highlighting the essential role S630 and H740 play in covalent bond formation between S630 and saxagliptin. Further supporting mechanism-based inhibition by saxagliptin, NMR spectra of enzyme-saxagliptin complexes revealed the presence of three downfield resonances with low fractionation factors characteristic of short and strong hydrogen bonds (SSHB). Comparison of the NMR spectra of various wild-type and mutant DPP-IV:ligand complexes enabled assignment of a resonance at approximately 14 ppm to H740. Two additional DPP-IV mutants, Y547F and Y547Q, generated to probe potential stabilization of the enzyme-inhibitor complex by this residue, did not show any differences in inhibitor binding either by ITC or NMR. Together with the previously published enzymatic data, the structural and binding data presented here strongly support a histidine-assisted covalent bond formation between S630 hydroxyl oxygen and the nitrile group of saxagliptin.
ESTHER : Metzler_2008_Protein.Sci_17_240
PubMedSearch : Metzler_2008_Protein.Sci_17_240
PubMedID: 18227430
Gene_locus related to this paper: human-DPP4