Bridged isocytosine-adenosine compounds: Synthesis and antibacterial evaluation
作者:O. William Lever、B. Randall Vestal
DOI:10.1002/jhet.5570230348
日期:1986.5
In an approach to novel antibacterial agents, we synthesized a series of 5-nitrosoisocytosines in which a 6-alkylamino substituent is bridged, through an amide linkage at the terminus of the alkyl chain, to the 5′-position of a 5′-deoxyadenosine moiety. A corresponding series of 5-nitro analogues were also prepared. None of the bridgedcompounds showed significant antibacterial activity.
A galactoside derivative of a nitrosoisocytosine inhibitor of dihydropteroate synthase: Synthesis and biological evaluation
作者:O. William Lever、Clifton Hyman、Paul H. Ray、Robert Ferone、John E. Kelsey
DOI:10.1002/jhet.5570230265
日期:1986.3
The synthesis of the O-β-D-galactosyl derivative 3 of the dihydropteroatesynthaseinhibitor 6-(3-(4-hydroxyphenoxy)propylamino)-5-nitrosoisocytosine (2) was accomplished through coupling of N-(3-(4-hydroxyphenoxy)propyl)phthalimide (4) with 2,3,4,6-tetra-O-acetyl-α-D-galactopyranosyl bromide followed by complete deblocking of the resulting β-glycoside 9 with hydrazine and then methanolic ammonia to
Structural Studies of Pterin-Based Inhibitors of Dihydropteroate Synthase
作者:Kirk E. Hevener、Mi-Kyung Yun、Jianjun Qi、Iain D. Kerr、Kerim Babaoglu、Julian G. Hurdle、Kanya Balakrishna、Stephen W. White、Richard E. Lee
DOI:10.1021/jm900861d
日期:2010.1.14
Dihydropteroate synthase (DHPS) is a key enzyme in bacterial folate synthesis and the target of the sulfonamide class of antibacterials. Resistance and toxicities associated with sulfonamides have led to a decrease in their clinical use. Compounds that bind to the pterin binding site of DHPS, as opposed to the p-amino benzoic acid (pABA) binding site targeted by the sulfonamide agents, arc anticipated to bypass sulfonamide resistance. To identify such inhibitors and map the pterin binding pocket, we have performed virtual screening, synthetic, and Structural studies using Bacillus anthracis DHPS. Several compounds with inhibitory activity have been identified, and Crystal Structures have been determined that show how the compounds engage the pterin site. The structural Studies identify the key binding elements and have been used to generate a structure-activity based pharmacophore map that will facilitate the development of the next generation or DHPS inhibitors which specifically target the pterin site.