title: Crystal structure of Rattus norvegicus Visfatin/PBEF/Nampt in complex with an FK866-based inhibitor.
abstract: Visfatin (Nampt/PBEF) plays a pivotal role in the salvage pathway for NAD(+) biosynthesis. Its potent inhibitor, FK866, causes cellular NAD(+) levels to decline, thereby inducing apoptosis in tumor cells. In an effort to improve the solubility and binding interactions of FK866, we designed and synthesized IS001, in which a ribose group is attached to the FK866 pyridyl ring. Here, we report the crystal structure of rat visfatin in complex with IS001. Like FK866, IS001 is positioned at the dimer interface, and all of the residues that interact with IS001 are involved in hydrophobic or pi-pi-stacking interactions. However, we were unable to detect any strong interactions between the added ribose ring of IS001 and visfatin, which implies that a bulkier modifying group is necessary for a tight interaction. This study provides additional structure-based information needed to optimize the design of visfatin inhibitors.
authors.affiliation: Department of Life Science, Gwangju Institute of Science and Technology, Gwangju 500-712, Korea.
authors.forename: Gil Bu
authors.initials: GB
authors.lastname: Kang
authors.forename: Man-Ho
authors.initials: MH
authors.lastname: Bae
authors.forename: Mun-Kyoung
authors.initials: MK
authors.lastname: Kim
authors.forename: Isak
authors.initials: I
authors.lastname: Im
authors.forename: Yong-Chul
authors.initials: YC
authors.lastname: Kim
authors.forename: Soo Hyun
authors.initials: SH
authors.lastname: Eom
mesh_terms: D000178:Acrylamides / Q000737:chemistry* / Q000494:pharmacology*; D000818:Animals; D001665:Binding Sites; D002151:Calorimetry; D018360:Crystallography, X-Ray; D008958:Models, Molecular; D054409:Nicotinamide Phosphoribosyltransferase / Q000037:antagonists & inhibitors* / Q000737:chemistry*; D010880:Piperidines / Q000737:chemistry* / Q000494:pharmacology*; D055503:Protein Multimerization; D017433:Protein Structure, Secondary; D011726:Pyridinium Compounds / Q000737:chemistry* / Q000494:pharmacology*; D051381:Rats
chemical_list: D000178:Acrylamides; C543903:IS 001; C480543:N-(4-(1-benzoylpiperidin-4-yl)butyl)-3-(pyridin-3-yl)acrylamide; D010880:Piperidines; D011726:Pyridinium Compounds; D054409:Nicotinamide Phosphoribosyltransferase