Synthesis and evaluation of 6-aza-2'-deoxyuridine monophosphate analogs as inhibitors of thymidylate synthases, and as substrates or inhibitors of thymidine monophosphate kinase in Mycobacterium tuberculosis.

Martin Kögler (1) , Roger Busson (1) , Steven de Jonghe (2) , Jef Rozenski (1) , Kristien van Belle (2) , Thierry Louat (2) , Hélène Munier-Lehmann (3) , Piet Herdewijn (4)

1 Laboratory of Medicinal Chemistry
2 Interface Valorisation Platform
3 Chimie et Biocatalyse
4 Laboratory for Medicinal Chemistry, Rega Institute for Medical Research

A series of 5-substituted analogs of 6-aza-2'-deoxyuridine 5'-monophosphate, 6-aza-dUMP, has been synthesized and evaluated as potential inhibitors of the two mycobacterial thymidylate synthases (i.e., a flavin-dependent thymidylate synthase, ThyX, and a classical thymidylate synthase, ThyA). Replacement of C(6) of the natural substrate dUMP by a N-atom in 6-aza-dUMP 1a led to a derivative with weak ThyX inhibitory activity (33% inhibition at 50 μM). Introduction of alkyl and aryl groups at C(5) of 1a resulted in complete loss of inhibitory activity, whereas the attachment of a 3-(octanamido)prop-1-ynyl side chain in derivative 3 retained the weak level of mycobacterial ThyX inhibition (40% inhibition at 50 μM). None of the synthesized derivatives displayed any significant inhibitory activity against mycobacterial ThyA. The compounds have also been evaluated as potential inhibitors of mycobacterial thymidine monophosphate kinase (TMPKmt). None of the derivatives showed any significant TMPKmt inhibition. However, replacement of C(6) of the natural substrate (dTMP) by a N-atom furnished 6-aza-dTMP (1b), which still was recognized as a substrate by TMPKmt.

Domains: Microbiology and Parasitology

Martin Kögler, Roger Busson, Steven de Jonghe, Jef Rozenski, Kristien van Belle, et al.. Synthesis and evaluation of 6-aza-2'-deoxyuridine monophosphate analogs as inhibitors of thymidylate synthases, and as substrates or inhibitors of thymidine monophosphate kinase in Mycobacterium tuberculosis.. Chemistry and Biodiversity, 2012, 9 (3), pp.536-56. ⟨10.1002/cbdv.201100285⟩. ⟨pasteur-00705897⟩