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Nossik M.N.,Ii Mechnikov Research Institute For Vaccines And Sera | Kiseleva I.A.,Ii Mechnikov Research Institute For Vaccines And Sera | Bochkova M.S.,RAS D. I. Ivanovsky Institute of Virology | Ryzhov K.A.,Ii Mechnikov Research Institute For Vaccines And Sera | And 2 more authors.
Voprosy Virusologii | Year: 2015

A panel of 16 HIV-1 isolates was designed. Those isolates were isolated from patients undergoing HAART and developing resistance to the antiretroviral drugs. It was shown that the isolates were resistant to nucleoside RT inhibitors (retrovir, epivir) and non-nucleoside inhibitors (viramun). Isolates had stable replication activity. Average rate of cells expressing viral Ag was 14-20%. The infectious titer was 2.4 Ig TCID50. The sequencing showed that all isolates were of the subtype A dominating In the major part of Russian Federation. This panel could be used as the biotechnological base for studying antiretroviral drugs of new generation and for the design of experimental vaccines. Source

Faizuloev E.,Ii Mechnikov Research Institute For Vaccines And Sera | Marova A.,Ii Mechnikov Research Institute For Vaccines And Sera | Nikonova A.,Ii Mechnikov Research Institute For Vaccines And Sera | Volkova I.,RAS Topchiev Institute of Petrochemical Synthesis | And 2 more authors.
Carbohydrate Polymers | Year: 2012

To endow the cationic polysaccharides with solubility in the whole pH-range without loss of functionality of the amino groups, different chitosan samples were treated with glycidyltrimethylammonium chloride. Each modified unit of the exhaustively alkylated quaternized chitosan (QCht) contained both quaternary and secondary amino groups. The intercalated dye displacement assay and ζ-potential measurements implied stability of QCht polyplexes at physiological conditions and protonation of the secondary amino groups in slightly acidic media which is favorable for transfection according to proton sponge mechanism. The cytotoxicity and transfection efficacy increased with the chain lengthening. Nevertheless, the longest chains of QCht, 250 kDa were less toxic than PEI for COS-1 cells and revealed comparable and even significantly higher transfection activity of siRNA and plasmid DNA, respectively. Thus, highly polymerized QCht (250 kDa) provided the highest level of the plasmid DNA transfection being 5 and 80 times more active than QCht (100 kDa) and QCht (50 kDa), respectively, and 4-fold more effective than PEI, 25 kDa. The established influence of QCht molecular weight on toxicity and transfection efficacy allows elaborating polysaccharide vectors that possess rational balance of these characteristics. © 2012 Elsevier Ltd. All rights reserved. Source

Glukhov A.S.,Russian Academy of Sciences | Krutilina A.I.,Russian Academy of Sciences | Shlyapnikov M.G.,Russian Academy of Sciences | Severinov K.,Russian Academy of Sciences | And 9 more authors.
PLoS ONE | Year: 2012

The complete sequence of the 46,267 bp genome of the lytic bacteriophage tf specific to Pseudomonas putida PpG1 has been determined. The phage genome has two sets of convergently transcribed genes and 186 bp long direct terminal repeats. The overall genomic architecture of the tf phage is similar to that of the previously described Pseudomonas aeruginosa phages PaP3, LUZ24 and phiMR299-2, and 39 out of the 72 products of predicted tf open reading frames have orthologs in these phages. Accordingly, tf was classified as belonging to the LUZ24-like bacteriophage group. However, taking into account very low homology levels between tf DNA and that of the other phages, tf should be considered as an evolutionary divergent member of the group. Two distinguishing features not reported for other members of the group were found in the tf genome. Firstly, a unique end structure - a blunt right end and a 4-nucleotide 3′-protruding left end - was observed. Secondly, 14 single-chain interruptions (nicks) were found in the top strand of the tf DNA. All nicks were mapped within a consensus sequence 5′-TACT/RTGMC-3′. Two nicks were analyzed in detail and were shown to be present in more than 90% of the phage population. Although localized nicks were previously found only in the DNA of T5-like and phiKMV-like phages, it seems increasingly likely that this enigmatic structural feature is common to various other bacteriophages. © 2012 Glukhov et al. Source

Magill D.J.,Queens University of Belfast | Shaburova O.V.,Ii Mechnikov Research Institute For Vaccines And Sera | Chesnokova E.N.,Ii Mechnikov Research Institute For Vaccines And Sera | Pleteneva E.A.,Ii Mechnikov Research Institute For Vaccines And Sera | And 2 more authors.
FEMS Microbiology Letters | Year: 2015

A complete nucleotide sequence of the new Pseudomonas aeruginosa Luz24likevirus phiCHU was obtained. This virus was shown to have a unique host range whereby it grew poorly on the standard laboratory strain PAO1, but infected 26 of 46 clinical isolates screened, and strains harbouring IncP2 plasmid pMG53. It was demonstrated that phiCHU has single-strand interruptions in its genome. Analysis of the phiCHU genome also suggested that recombination event(s) participated in the evolution of the leftmost portion of the genome, presumably encoding early genes. © FEMS 2015. All rights reserved. Source

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