当前位置： SCI文献检索 > JOURNAL OF MEDICINAL CHEMISTRY期刊下所有文献 > Facile Synthesis, Geometry, and 2'-Substituent-Dependent in Vivo Activity of 5'-(E)- and 5'-(Z)-Vinylphosphonate-Modified siRNA Conjugates.

Facile Synthesis, Geometry, and 2'-Substituent-Dependent in Vivo Activity of 5'-(E)- and 5'-(Z)-Vinylphosphonate-Modified siRNA Conjugates.

Abstract：

:(E)-Vinylphosphonate ((E)-VP), a metabolically stable phosphate mimic at the 5'-end of the antisense strand, enhances the in vivo potency of siRNA. Here we describe a straightforward synthetic approach to incorporate a nucleotide carrying a vinylphosphonate (VP) moiety at the 5'-end of oligonucleotides under standard solid-phase synthesis and deprotection conditions by utilizing pivaloyloxymethyl (POM) protected VP-nucleoside phosphoramidites. The POM protection enhances scope and scalability of 5'-VP-modified oligonucleotides and, in a broader sense, the synthesis of oligonucleotides modified with phosphonate moieties. Trivalent N-acetylgalactosamine-conjugated small interfering RNA (GalNAc-siRNA) comprising (E)-geometrical isomer of VP showed improved RISC loading with robust RNAi-mediated gene silencing in mice compared to the corresponding (Z)-isomer despite similar tissue accumulation. We also obtained structural insights into why bulkier 2'-ribosugar substitutions such as 2'-O-[2-(methylamino)-2-oxoethyl] are well tolerated only when combined with 5'-(E)-VP.

journal_name

J Med Chem

journal_title

Journal of medicinal chemistry

authors

Parmar RG,Brown CR,Matsuda S,Willoughby JLS,Theile CS,Charissé K,Foster DJ,Zlatev I,Jadhav V,Maier MA,Egli M,Manoharan M,Rajeev KG

doi

10.1021/acs.jmedchem.7b01147

subject

Has Abstract

pub_date

2018-02-08 00:00:00

pages

734-744

issue

3

eissn

0022-2623

issn

1520-4804

journal_volume

61

pub_type

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