Ziemkowski P, Felczak K, Poznański J, Kulikowski T, Zieliński Z, Cieśla J, Rode W. Interactions of 2'-fluoro-substituted dUMP analogues with thymidylate synthase.
Biochem Biophys Res Commun 2007;
362:37-43. [PMID:
17692822 DOI:
10.1016/j.bbrc.2007.07.097]
[Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/17/2007] [Accepted: 07/19/2007] [Indexed: 11/22/2022]
Abstract
A series of 2'-fluoro-substituted dUMP/FdUMP analogues were synthesized, their interaction with human recombinant thymidylate synthase investigated, and structural (1)H and (19)F NMR study of the corresponding nucleosides performed. While 2'-F-dUMP (fluorine in the "down" configuration), in striking contrast to 2'-F-ara-UMP (fluorine in the "up" configuration) and 2',2''-diF-dUMP, showed substrate activity, 2'-F-ara-UMP and 2',2''-diF-dUMP were classic inhibitors, and 2',5-diF-ara-UMP behaved as a strong slow-binding inhibitor, suggesting the 2'-F substituent in the "up" position to interfere with the active center cysteine thiol addition to the pyrimidine C(6) and the pyrimidine C(5)-F to prevent this interference. In support, the direct through space heteronuclear coupling J(HF) was observed for the fluorine "up" derivatives, 2'-F-ara-U and 2',5-diF-ara-U, causing the splitting of the H(6) resonance lines. The absence of such splitting in 2',2''-diF-dUrd, indicating an unusual orientation of the base in relation to the furanose, was associated with an exceptionally weak interaction with the enzyme.
Collapse