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Synthesis and substrate properties towards HIV-1 reverse transcriptase of new diphosphate analogues of 9-[(2-phosphonomethoxy)ethyl]adenine

Abstract : Background The replacement of β,γ-pyrophosphate by β,γ-phosphonate moieties within the triphosphate chain of 5'-triphosphate nucleoside analogues was previously studied for various antiviral nucleoside analogues such as AZT and 2',3'-dideoxynucleosides. Thus, it has been shown that these chemical modifications could preserve, in some cases, the terminating substrate properties of the triphosphate analogue for HIV-RT. Herein, we aimed to study such 5'-triphosphate mimics based on the scaffold of the well-known antiviral agent 9-[(2-phosphonomethoxy)ethyl]adenine (PMEA, Adefovir). Methods Synthesis involved coupling of a morpholidate derivative of PMEA with appropriate pyrophosphoryl analogues. The relative efficiencies of incorporation of the studied diphosphate phosphonates were measured using subtype B WT HIV-1 RT in an in vitro susceptibility assay, in comparison to the parent nucleotide analogue (PMEApp). Results Searching for nucleoside 5'-triphosphate mimics, we have synthesized and studied a series of diphosphate analogues of PMEA bearing non hydrolysable bonds between the and phosphorus atoms. We also examined their relative inhibitory capacity towards HIV-1 reverse transcriptase in comparison to the parent nucleotide analogue (PMEApp). Only one of them appeared as a weak inhibitor (IC50 = 403.0 ± 75.5 µM) and proved to be less effective than PMEApp (IC50 = 6.4 ± 0.8 µM). Conclusion PMEA diphosphoryl derivatives were designed as potential substrates and/or inhibitors of various viral polymerases. These modifications dramatically affect their ability to inhibit HIV-RT.
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Wolfgang Hg Laux, Stephane Priet, Karine Alvarez, Suzanne Peyrottes, Christian Perigaud. Synthesis and substrate properties towards HIV-1 reverse transcriptase of new diphosphate analogues of 9-[(2-phosphonomethoxy)ethyl]adenine. Antiviral Chemistry and Chemotherapy, International Medical Press, 2018, 26, pp.204020661875763. ⟨10.1177/2040206618757636⟩. ⟨hal-02094536⟩

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