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A nucleoside triphosphate is a nucleoside containing a nitrogenous base bound to a 5-carbon sugar (either ribose or deoxyribose), with three phosphate groups bound to the sugar. [1] They are the molecular precursors of both DNA and RNA, which are chains of nucleotides made through the processes of DNA replication and transcription. [2]
The non-nucleoside analogue inhibitors inhibit the polymerase activity in different ways, which depend on the allosteric site to which the inhibitor binds. [15] [16] In contrast to the nucleoside inhibitors, non-nucleoside analogue inhibitors do not compete with nucleotides nor the RNA template. Instead, by binding to RNA-dependent RNA ...
GS-441524 nucleoside is phosphorylated by nucleoside kinases (probably adenosine kinase (ADK), which is the enzyme that phosphorylates the structurally similar ribavirin), and then phosphorylated again by nucleoside-diphosphate kinase (NDK) to the active nucleotide triphosphate form.
The antiviral drug aciclovir (bottom), a nucleoside analogue that functions by mimicking guanosine (top) Nucleoside analogues are structural analogues of a nucleoside, which normally contain a nucleobase and a sugar. Nucleotide analogues are analogues of a nucleotide, which normally has one to three phosphates linked to a nucleoside.
A nucleoside consists simply of a nucleobase (also termed a nitrogenous base) and a five-carbon sugar (ribose or 2'-deoxyribose) whereas a nucleotide is composed of a nucleobase, a five-carbon sugar, and one or more phosphate groups. In a nucleoside, the anomeric carbon is linked through a glycosidic bond to the N9 of a purine or the N1 of a ...
Drug resistance is a serious clinical concern in treatment of viral infection, and it is a particularly difficult problem in treatment of HIV. [25] Resistance mutations are known for all approved NRTIs. [26] Two main mechanisms are known that cause NRTI drug resistance: Interference with the incorporation of NRTIs and excision of incorporated ...
Prior to the discovery of sofosbuvir, a variety of nucleoside analogs had been examined as antihepatitis C treatments, but these exhibited relatively low potency. This low potency arose in part because the enzymatic addition of the first of the three phosphate groups of the triphosphate is slow.
Guanosine-5'-triphosphate (GTP) is a purine nucleoside triphosphate. It is one of the building blocks needed for the synthesis of RNA during the transcription process. Its structure is similar to that of the guanosine nucleoside , the only difference being that nucleotides like GTP have phosphates on their ribose sugar.