Timofey S Zatsepin

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The interaction of nucleotide excision repair factors-xeroderma pigmentosum complementation group C protein in complex with human homolog of yeast Rad23 protein (XPC-HR23B), replication protein A (RPA), and xeroderma pigmentosum complementation group A protein (XPA)—with 48-mer DNA duplexes imitating damaged DNA structures was investigated. All studied(More)
The specific activity of the human immunodeficiency virus, type 1 (HIV-1), integrase on the viral long terminal repeat requires the binding of the enzyme to certain sequences located in the U3 and U5 regions at the ends of viral DNA, but the determinants of this specific DNA-protein recognition are not yet completely understood. We synthesized DNA duplexes(More)
2'-Deoxyoligonucleotides and 2'-O-methyloligoribonucleotides carrying one or more 2'-aldehyde groups were synthesized and coupled to peptides containing an N-terminal cysteine, aminooxy, or hydrazide group to give peptide-oligonucleotide conjugates incorporating single or multiple peptides in good yield. The facile conjugation method allows specific(More)
This review outlines the synthesis of covalent conjugates of oligonucleotides and their analogues that are obtained by reactions of carbonyl compounds with various nucleophiles such as primary amines, N-alkoxyamines, hydrazines, and hydrazides. The products linked by imino, oxime, hydrazone, or thiazolidine groups are shown to be useful intermediates for a(More)
Nowadays, oligonucleotide-carbohydrate conjugates are used in antisense biotechnology and in the study of glycosylated DNA functioning in vitro. The application of mono- and disaccharide phosphoramidites, solid-phase supports with immobilized carbohydrates, glycosylated nucleoside phosphoramidites, and postsynthetic conjugation of reactive sugar derivatives(More)
Chemical landscape of natural RNA species is decorated with the large number of modified nucleosides. Some of those could easily be detected by reverse transcription, while others permit only high-performance liquid chromatography or mass-spectrometry detection. Presence of m(6)A nucleoside at a particular position of long RNA molecule is challenging to(More)
Oligonucleotides carrying 2'-aldehyde groups were synthesized and coupled to peptides containing an N-terminal cysteine, aminooxy or hydrazide group to give peptide-oligonucleotide conjugates in good yield. The synthesis of a novel phosphoramidite reagent for the incorporation of 2'-O-(2,3-diaminopropyl)uridine into oligonucleotides was also described.(More)
The review describes key aspects of the synthesis and biological activities of conjugates of oligonucleotides and their analogues with synthetic peptides, in particular aimed towards gene silencing applications. The common methods of synthesis of oligonucleotide-peptide conjugates (OPCs) and PNA-peptide conjugates (PPCs) are described, which include both(More)
This review covers the basic aspects of small interfering RNA delivery by lipid nano-particles (LNPs) and elaborates on the current status of clinical trials for these systems. We briefly describe the roles of all LNP components and possible strategies for their improvement. We also focus on the current clinical trials using LNP-formulated RNA and the(More)
Bacterial 6S RNAs bind to the housekeeping RNA polymerase (σ(A)-RNAP in Bacillus subtilis) to regulate transcription in a growth phase-dependent manner. B. subtilis expresses two 6S RNAs, 6S-1 and 6S-2 RNA, with different expression profiles. We show in vitro that 6S-2 RNA shares hallmark features with 6S-1 RNA: Both (1) are able to serve as templates for(More)