N. B. Tarusova

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DNA-directed RNA polymerase from Escherichia coli can break down RNA by catalysing the reverse of the reaction: NTP + (RNA)n = (RNA)n+1 + PPi where n indicates the number of nucleotide residues in the RNA molecule, to yield nucleoside triphosphates. This reaction requires the ternary complex of the polymerase with template DNA and the RNA that it has(More)
The antiviral activity of 3'-azido-2',3'-dideoxynucleoside 5'-phosphate analogues: 5'-phosphonomethylene-3'-azido-2',3'-dideoxythymidine, 5'-methylphosphonate and 5'-phosphite of 3'-azido-2',3'-dideoxythymidine, 5'-phosphites of 3'-azido-2',3'-dideoxyadenosine and guanosine was investigated in HIV-infected cell cultures (human lymphoblastoid cells). The(More)
Methanediphosphonate and 12 analogs thereof with different substituents at the carbon atom are potent competitive inhibitors of highly purified rat liver and bovine heart inorganic pyrophosphatases. The inhibition constants for the most effective diphosphonates, which contain an NH2 or OH group at the bridge carbon atom, are in the micromolar range. Yeast(More)
Processive pyrophosphorolysis of RNA from ternary RNA polymerase-nascent RNA-delta D111 T7 DNA complex has been followed in the absence of nucleoside triphosphates. Series of inorganic pyrophosphate analogs were investigated for their ability to sustain the reaction and to compete with inorganic pyrophosphate for the reaction. Methylenediphosphonic,(More)
The inorganic pyrophosphatase activity was determined in different tissues of mice. The immunization of mice by sheep erythrocytes increased the inorganic pyrophosphatase activity of the spleen. The in vivo administration of bisphosphonates (40 mg per 1 g of mass), which are structural analogs of inorganic pyrophosphate (methylene bisphosphonic acid--MBPA,(More)
Anti-HIV activity and cytotoxicity were tested for novel phosphonate derivatives of AZT, d4T and ddA. For d4T phosphonate derivatives the most active was 2',3'-Dideoxy-2',3'-didehydrothymidine 5'-isopropylphosphite and among the AZT phosphonate derivatives highest activity was shown by 2',3'-Dideoxy-3'-azidothymidine 5'-cyclohexylphosphite.
Bovine tryptophanyl-tRNA synthetase (E.C.6.1.1.2) lacking Zn2+ ions removed by chelation with phosphonate analog of P1,P4-bis-(5'-adenosyl)tetraphosphate (Ap4A) was obtained (E-Zn). E-Zn lost the ability to form tryptophanyl adenylate, however it hydrolyses ATP to ADP and further on to AMP and Pi. GTP serves as a substrate with Km approximately 0.6 mM. It(More)
Comparative study of DNA biosynthesis inhibition, catalyzed by avian myeloblastose virus (AMV) reverse transcriptase (RT), human immunodeficiency virus (HIV) recombinant and native RT, has been performed. 3'-Azido-2',3'-dideoxythymidine 5'-triphosphate (AzTTP); 3'-azido-2',3'-dideoxythymidine 5'-methylenephosphonate-diphosphate:(More)
The effects of bis(adenosyl-5′)oligophosphates on cation conductance-promoting ATP receptors at the somatic membrane of rat sensory ganglia neurons were investigated. Both bis(adenosyl-5′)tetraphosphate and bis(adenosyl-5′)pentaphosphate act as partial agonists of ATP receptors at saturating concentration and activate ionic currents of almost one order of(More)
A number of nucleoside 5'-phosphonates and nucleoside 5'-methylphosphonates were synthesised, to study their ability to inhibit reproduction of HIV-1. Three compounds, 5'-hydrogen phosphonates of 3'-azido-2',3'-dideoxythymidine (AZT-HP, IVc), 3'-fluoro-2',3'-dideoxythymidine (FLT-HP, IVa) and 2',3'-dideoxyadenosine (ddA-HP, I), exhibit potent anti-HIV-1(More)