The present invention includes methods of treating or preventing malaria by administering an anti-malarial effective amount of 6-substituted uridine derivatives to a subject need thereof. The invention also includes new 6-substituted uridine derivatives for use as therapeutics, in particular to treat malaria.
The present invention includes methods of treating or preventing cancer by administering an effective amount of 6-substituted pyrimidine derivatives of the Formula I to a subject need thereof:
本发明涉及通过向需要该治疗的受体施用公式I的6-取代嘧啶衍生物的有效量来治疗或预防癌症的方法:
Substrate Distortion Contributes to the Catalysis of Orotidine 5′-Monophosphate Decarboxylase
作者:Masahiro Fujihashi、Toyokazu Ishida、Shingo Kuroda、Lakshmi P. Kotra、Emil F. Pai、Kunio Miki
DOI:10.1021/ja408197k
日期:2013.11.20
Orotidine 5'-monophosphate decarboxylase (OD-Case) accelerates the decarboxylation of orotidine 5'-monophosphate (OMP) to uridine 5'-monophosphate (UMP) by 17 orders of magnitude. Eight new crystal structures with ligand analogues combined with computational analyses of the enzyme's short-lived intermediates and the intrinsic electronic energies to distort the substrate and other ligands improve our understanding of the still controversially discussed reaction mechanism. In their respective complexes, 6-methyl-UMP displays significant distortion of its methyl substituent bond, 6-amino-UMP shows the competition between the K72 and C6 substituents for a position close to D70, and the methyl and ethyl esters of OMP both induce rotation of the carboxylate group substituent out of the plane of the pyrimidine ring. Molecular dynamics and quantum mechanics/molecular mechanics computations of the enzyme-substrate complex also show the bond between the carboxylate group and the pyrimidine ring to be distorted, with the distortion contributing a 10-15% decrease of the Delta Delta G(double dagger) value. These results are consistent with ODCase using both substrate distortion and transition-state stabilization, primarily exerted by K72, in its catalysis of the OMP decarboxylation reaction.