Characterization of Imidazo[4,5-
<i>d</i>
]Pyridazine Nucleosides as Modulators of Unwinding Reaction Mediated by West Nile Virus Nucleoside Triphosphatase/Helicase: Evidence for Activity on the Level of Substrate and/or Enzyme
作者:Peter Borowski、Melanie Lang、Annemarie Haag、Herbert Schmitz、Joonho Choe、Huan-Ming Chen、Ramachandra S. Hosmane
DOI:10.1128/aac.46.5.1231-1239.2002
日期:2002.5
inhibitors of enzymes that unwind DNA or RNA. In the present study we describe the synthesis and properties of some nucleoside analogues that interact with double-stranded DNA but that, in contrast, facilitate the unwinding reaction mediated by West Nile (WN) virus nucleoside triphosphatase (NTPase)/helicase. The nucleoside analogues described, 1-(2'-O-methyl-beta-D-ribofuranosyl)imidazo[4,5-d]pyridazine-4
与DNA或RNA相互作用的化合物通常充当释放DNA或RNA的酶的抑制剂。在本研究中,我们描述了一些与双链DNA相互作用的核苷类似物的合成和性质,但与此相反,它们促进了由西尼罗河(WN)病毒核苷三磷酸酶(NTPase)/解旋酶介导的解旋反应。所描述的核苷类似物,1-(2'-O-甲基-β-D-核呋喃糖基)咪唑并[4,5-d]哒嗪-4,7(5H,6H)-二酮(HMC-HO4),1-( β-D-呋喃呋喃糖基)咪唑并[4,5-d]哒嗪-4,7(5H,6H)-二酮和1-(2'-脱氧-α-D-呋喃呋喃糖基)咪唑并[4,5-d]哒嗪-4,7(5H,6H)二酮,均含有咪唑并[4,5-d]哒嗪环系统。发现对解旋酶活性的增强作用的程度取决于DNA底物暴露于化合物的时间及其浓度。然而,已发现核苷类似物能够通过在酶水平上起作用的机制解偶联酶的ATP酶和解旋酶活性。因此,在HMC-HO4的情况下,与酶的直接相互作用导