J
John D. Knafels
Researcher at Pfizer
Publications - 25
Citations - 1173
John D. Knafels is an academic researcher from Pfizer. The author has contributed to research in topics: Glucokinase & Janus kinase. The author has an hindex of 17, co-authored 23 publications receiving 952 citations.
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Journal ArticleDOI
Crystal Structure of the Herpes Simplex Virus 1 DNA Polymerase
Shenping Liu,John D. Knafels,Jeanne S. Chang,Gregory Allan Waszak,Eric T. Baldwin,Martin R. Deibel,Darrell R. Thomsen,Fred L. Homa,Peter A. Wells,Monica C. Tory,Roger A. Poorman,Hua Gao,Xiayang Qiu,Andrew P. Seddon +13 more
TL;DR: The first crystal structure of a herpesvirus polymerase is presented, the Herpes Simplex Virus type 1 DNA polymerase, at 2.7 Å resolution and a novel inhibition mechanism is proposed in which a representative of a series of non-nucleosidic viral polymerase inhibitors, the 4-oxo-dihydroquinolines, binds at the polymerase active site interacting non-covalently with both the polymer enzyme and the DNA duplex.
Journal ArticleDOI
Discovery of (S)-6-(3-cyclopentyl-2-(4-(trifluoromethyl)-1H-imidazol-1-yl)propanamido)nicotinic acid as a hepatoselective glucokinase activator clinical candidate for treating type 2 diabetes mellitus.
Jeffrey A. Pfefferkorn,Angel Guzman-Perez,John Litchfield,Robert J. Aiello,Judith L. Treadway,John C. Pettersen,Martha L. Minich,Kevin J. Filipski,Christopher S. Jones,Meihua Tu,Gary Erik Aspnes,Hud Lawrence Risley,Jianwei Bian,Benjamin D. Stevens,Patricia Bourassa,Theresa D’Aquila,Levenia Baker,Nicole Barucci,Alan Robertson,Francis Bourbonais,David R. Derksen,Margit MacDougall,Over Cabrera,Jing Chen,Amanda L. Lapworth,James A. Landro,William J. Zavadoski,Karen Atkinson,Nahor Haddish-Berhane,Beijing Tan,Lili Yao,Rachel E. Kosa,Manthena V.S. Varma,Bo Feng,David B. Duignan,Ayman El-Kattan,Sharad B. Murdande,Shenping Liu,Mark Ammirati,John D. Knafels,Paul DaSilva-Jardine,Laurel Sweet,Spiros Liras,Timothy P. Rolph +43 more
TL;DR: 19 is identified as a potent glucokinase activator with a greater than 50-fold liver-to-pancreas ratio of tissue distribution in rodent and non-rodent species, leading to its selection as a clinical development candidate for treating type 2 diabetes.
Journal ArticleDOI
Dual Inhibition of TYK2 and JAK1 for the Treatment of Autoimmune Diseases: Discovery of (( S)-2,2-Difluorocyclopropyl)((1 R,5 S)-3-(2-((1-methyl-1 H-pyrazol-4-yl)amino)pyrimidin-4-yl)-3,8-diazabicyclo[3.2.1]octan-8-yl)methanone (PF-06700841).
Andrew Fensome,Catherine M. Ambler,Eric P. Arnold,Mary Ellen Banker,Matthew Frank Brown,Jill Chrencik,James D. Clark,Martin E. Dowty,Ivan Viktorovich Efremov,Andrew C. Flick,Brian S. Gerstenberger,Ariamala Gopalsamy,Matthew Merrill Hayward,Martin Hegen,Brett D. Hollingshead,Jason Jussif,John D. Knafels,David C. Limburg,David W. Lin,Tsung H. Lin,Betsy Pierce,Eddine Saiah,Raman Sharma,Peter T. Symanowicz,Jean-Baptiste Telliez,John I. Trujillo,Felix Vajdos,Fabien Vincent,Zhao-Kui Wan,Li Xing,Xiaojing Yang,Xin Yang,Liying Zhang +32 more
TL;DR: It is hypothesized that a dual JAK1/TYK2 inhibitor will provide additional efficacy, while managing risk by optimizing selectivity against JAK2 driven hematopoietic changes.
Journal ArticleDOI
Pyridone Methylsulfone Hydroxamate LpxC Inhibitors for the Treatment of Serious Gram-Negative Infections
Justin I. Montgomery,Matthew Frank Brown,Usa Reilly,Loren M. Price,Joseph A. Abramite,Joel T. Arcari,Rose Barham,Ye Che,Jinshan Michael Chen,Seung Won Chung,Elizabeth M. Collantes,Charlene R. Desbonnet,Matthew David Doroski,Jonathan L. Doty,Juntyma J. Engtrakul,Thomas M. Harris,Michael D. Huband,John D. Knafels,Karen L. Leach,Shenping Liu,Anthony Marfat,Laura A. McAllister,Eric B. McElroy,Carol A. Menard,Mark J. Mitton-Fry,Lisa Mullins,Mark C. Noe,John P. O'Donnell,Robert M. Oliver,Joseph Penzien,Mark S. Plummer,Veerabahu Shanmugasundaram,Christy Thoma,Andrew P. Tomaras,Daniel P. Uccello,Alfin D. N. Vaz,Donn G. Wishka +36 more
TL;DR: Members of this series of LpxC inhibitors have improved solubility and free fraction when compared to compounds in the previously described biphenyl methylsulfone hydroxamate series, and they maintain superior Gram-negative antibacterial activity to comparator agents.
Journal ArticleDOI
Potent inhibitors of LpxC for the treatment of Gram-negative infections.
Matthew Frank Brown,Usa Reilly,Joseph A. Abramite,Joel T. Arcari,Robert M. Oliver,Rose Barham,Ye Che,Jinshan Michael Chen,Elizabeth M. Collantes,Seung Won Chung,Charlene R. Desbonnet,Jonathan L. Doty,Matthew David Doroski,Juntyma J. Engtrakul,Thomas M. Harris,Michael D. Huband,John D. Knafels,Karen L. Leach,Shenping Liu,Anthony Marfat,Andrea Marra,Eric B. McElroy,Michael Melnick,Carol A. Menard,Justin I. Montgomery,Lisa Mullins,Mark C. Noe,John P. O'Donnell,Joseph Penzien,Mark S. Plummer,Loren M. Price,Veerabahu Shanmugasundaram,Christy Thoma,Daniel P. Uccello,Joseph S. Warmus,Donn G. Wishka +35 more
TL;DR: The synthesis and SAR as well as selectivity, pharmacokinetic, and infection model data for representative analogues of a novel series of potent antibacterial LpxC inhibitors represented by hydroxamic acid are presented.