title: Metal mediated inhibition of methionine aminopeptidase by quinolinyl sulfonamides.
abstract: Quinolinyl sulfonamides, such as N-(quinolin-8-yl)methanesulfonamide (10) and N-(5-chloroquinolin-8-yl)methanesulfonamide (11), were identified as potent methionine aminopeptidase (MetAP) inhibitors by high throughput screening of a diverse chemical library of small organic compounds. They showed different inhibitory potencies on Co(II)-, Ni(II)-, Fe(II)-, Mn(II)-, and Zn(II)-forms of Escherichia coli MetAP, and their inhibition is dependent on metal concentration. X-ray structures of E. coli MetAP complexed with 10 revealed that the inhibitor forms a metal complex with the residue H79 at the enzyme active site; the complex is further stabilized by an extended H-bond and metal interaction network. Analysis of the inhibition of MetAP by these inhibitors indicates that this is a typical mechanism of inhibition for many non-peptidic MetAP inhibitors and emphasizes the importance of defining in vitro conditions for identifying and evaluating MetAP inhibitors that will be capable of giving information relevant to the in vivo situation.
authors.affiliation: High Throughput Screening Laboratory, University of Kansas, Lawrence, KS 66045, USA.
authors.forename: Min
authors.initials: M
authors.lastname: Huang
authors.forename: Sheng-Xue
authors.initials: SX
authors.lastname: Xie
authors.forename: Ze-Qiang
authors.initials: ZQ
authors.lastname: Ma
authors.forename: Robert P
authors.initials: RP
authors.lastname: Hanzlik
authors.forename: Qi-Zhuang
authors.initials: QZ
authors.lastname: Ye
mesh_terms: D000626:Aminopeptidases / Q000037:antagonists & inhibitors* / Q000378:metabolism; D016227:Benzoquinones / Q000737:chemistry*; D001665:Binding Sites; D002413:Cations, Divalent / Q000737:chemistry; D018360:Crystallography, X-Ray; D004926:Escherichia coli / Q000201:enzymology; D006860:Hydrogen Bonding; D020128:Inhibitory Concentration 50; D019216:Metals, Heavy / Q000494:pharmacology*; D063208:Methionyl Aminopeptidases; D008958:Models, Molecular; D015394:Molecular Structure; D011480:Protease Inhibitors / Q000737:chemistry* / Q000494:pharmacology*; D017434:Protein Structure, Tertiary; D013057:Spectrum Analysis; D013449:Sulfonamides / Q000737:chemistry* / Q000494:pharmacology*
chemical_list: D016227:Benzoquinones; D002413:Cations, Divalent; D019216:Metals, Heavy; D011480:Protease Inhibitors; D013449:Sulfonamides; C004532:quinone; D000626:Aminopeptidases; D063208:Methionyl Aminopeptidases