Prolonged self-assembly of H. pylori ferritin globules at physiological conditions.

One of the promising drug delivery tools is ferritin, which features high stability at a wide range of conditions and protects cargo by its spherical protein shell. We studied the self-assembly into homoglobules of ferritin from H. pylori and a chimeric protein ferritin-SUMO.

The Assessment of Methyl Methanesulfonate Absorption by Amphipods from the Environment Using Lux-Biosensors.

The ability of aquatic mesofauna representatives involved in trophic chains to sorb and accumulate toxicants is important for understanding the functioning of aquatic ecosystems and for fishing industry. This study investigated the capacity of marine amphipod and freshwater amphipods and to absorb the DNA-alkylating agent methyl methanesulfonate (MMS). The presence of alkylating agents in the environment and in the tissues of the amphipods was determined using whole-cell lux-biosensor MG1655 pAlkA-lux, in which the genes from , enabling the luminescence of the cell culture, are controlled by the P promoter of DNA glycosylase.

luxA Gene From Enhygromyxa salina Encodes a Functional Homodimeric Luciferase.

Several clades of luminescent bacteria are known currently. They all contain similar lux operons, which include the genes luxA and luxB encoding a heterodimeric luciferase. The aldehyde oxygenation reaction is presumed to be catalyzed primarily by the subunit LuxA, whereas LuxB is required for efficiency and stability of the complex.

Broadness and specificity: ArdB, ArdA, and Ocr against various restriction-modification systems.

ArdB, ArdA, and Ocr proteins inhibit the endonuclease activity of the type I restriction-modification enzymes (RMI). In this study, we evaluated the ability of ArdB, ArdA, and Ocr to inhibit different subtypes of RMI systems (IA, IB, and IC) as well as two RMI systems. Furthermore we explored, the antirestriction activity of ArdA, ArdB, and Ocr against a type III restriction-modification system (RMIII) EcoPI and BREX.

Observation of Cytotoxicity of Phosphonium Derivatives Is Explained: Metabolism Inhibition and Adhesion Alteration.

The search for new antibiotics, substances that kill prokaryotic cells and do not kill eukaryotic cells, is an urgent need for modern medicine. Among the most promising are derivatives of triphenylphosphonium, which can protect the infected organs of mammals and heal damaged cells as mitochondria-targeted antioxidants. In addition to the antioxidant action, triphenylphosphonium derivatives exhibit antibacterial activity.

Genetic Structure Analysis of 155 Transboundary and Local Populations of Cattle (, and ) Based on STR Markers.

Every week, 1-2 breeds of farm animals, including local cattle, disappear in the world. As the keepers of rare allelic variants, native breeds potentially expand the range of genetic solutions to possible problems of the future, which means that the study of the genetic structure of these breeds is an urgent task. Providing nomadic herders with valuable resources necessary for life, domestic yaks have also become an important object of study.

Genotoxic Effect of Dicyclopropanated 5-Vinyl-2-Norbornene.

Dicyclopropanated 5-vinyl-2-norbornene (dcpVNB) is a strained polycyclic hydrocarbon compound with a high energy content, which makes it promising for the development of propellant components based on it. In this work, the genotoxic properties of dcpVNB were studied using whole-cell -biosensors based on and . It was shown that the addition of dcpVNB to bacterial cells leads to the appearance of DNA damage inducing the SOS response and Dps expression with slight activation of the OxyR-mediated response to oxidative stress.

Template-Directed Polymerization Strategy for Producing rGO/UHMWPE Composite Aerogels with Tunable Properties.

In this paper, we suggest a previously unknown template-directed polymerization strategy for producing graphene/polymer aerogels with elevated mechanical properties, preservation of the nanoscale pore structure, an extraordinary crystallite structure, as well as tunable electrical and hydrophobic properties. The suggested approach is studied using the reduced graphene oxide (rGO)/ultrahigh molecular weight polyethylene (UHMWPE) system as an example. We also develop a novel method of ethylene polymerization with formation of UHMWPE directly on the surface of rGO sheets prestructured as the aerogel template.

New temperature-switchable acyl homoserine lactone-regulated expression vector.

Bacterial expression systems play an indispensable role in the biosynthesis of recombinant proteins. Different proteins and the tasks associated with them may require different systems. The purpose of this work is to make an expression vector that allows switching on and off the expression of the target gene during cell incubation.

Ferritin self-assembly, structure, function, and biotechnological applications.

Ferritin is a vital protein complex responsible for storing iron in almost all living organisms. It plays a crucial role in various metabolic pathways, inflammation processes, stress response, and pathogenesis of cancer and neurodegenerative diseases. In this review we discuss the role of ferritin in diseases, cellular iron regulation, its structural features, and its role in biotechnology.

Segregated Structure Copolymer of Vinylidene Fluoride and Tetrafluoroethylene Composites Filled with rGO, SWCNTs and Their Mixtures.

This work is devoted to the formation and study of polymer composites with a segregated structure filled with single-walled carbon nanotubes (SWCNTs), reduced graphene oxide (rGO), and their mixtures. For the first time, polymer composites with a segregated structure filled with rGO/SWCNTs mixtures were obtained. A copolymer of vinylidene fluoride and tetrafluoroethylene (P(VDF-TFE)) was used as a polymer matrix.

Anti-Inflammatory Activity of Soluble Epoxide Hydrolase Inhibitors Based on Selenoureas Bearing an Adamantane Moiety.

The inhibitory potency of the series of inhibitors of the soluble epoxide hydrolase (sEH) based on the selenourea moiety and containing adamantane and aromatic lipophilic groups ranges from 34.3 nM to 1.2 μM.

LitR directly upregulates autoinducer synthesis and luminescence in .

LitR is a master-regulator of transcription in the and quorum sensing (QS) systems of bacteria from and genera. Here, we for the first time directly investigated the influence of LitR on gene expression in the QS system of psychrophilic bacteria . Investigated promoters were fused with reporter genes cassette in a heterological system of cells, was introduced into the cells under control of P promoter.

Constructing of -Based Lux-Biosensors with the Use of Stress-Inducible Promoters.

Here, we present a new lux-biosensor based on for detecting of DNA-tropic and oxidative stress-causing agents. Hybrid plasmids pNK-DinC, pNK-AlkA, and pNK-MrgA have been constructed, in which the reporter genes are transcribed from the stress-inducible promoters of : the SOS promoter P, the methylation-specific response promoter P, and the oxidative stress promoter P. The luminescence of based biosensors specifically increases in response to the appearance in the environment of such common toxicants as mitomycin C, methyl methanesulfonate, and HO.

Influence of the Regulatory Gene Dosage and Expression Level on the Sensitivity of the Whole-Cell Biosensor to Acyl-Homoserine Lactone.

LuxR and LuxR1 and LuxR2 regulatory proteins are quorum sensing transcriptional (QS) activators, inducing promoters of genes in the presence of an autoinducer (3-oxo-hexanoyl-l-homoserine lactone). In the cells, genes are regulated by HNS, CRP, LitR, etc. Here we investigated the role of the expression level in LuxI/R QS system functionality and improved the whole-cell biosensor for autoinducer detection.

Segregated Network Polymer Composites with High Electrical Conductivity and Well Mechanical Properties based on PVC, P(VDF-TFE), UHMWPE, and rGO.

The formation of a segregated network structure (wittingly uneven distribution of a filler) is one of the most promising strategies for the fabrication of electrically conductive polymer composites at present. However, the simultaneous achievement of high values of electrical conductivity with the retention of well mechanical properties within this approach remains a great challenge. Here, by means of X-ray photoelectron spectra (XPS), near-edge X-ray absorption fine structure (NEXAFS) spectra, scanning electron microscopy (SEM), dielectric spectroscopy, and compression engineering stress-strain curve analysis, we have studied the effect of a segregated network structure on the electrical conductivity and mechanical properties of a set of polymer composites.

Comparative analysis of Aliivibrio logei luxR1 and luxR2 genes regulation in Escherichia coli cells.

Regulation of Aliivibrio logei luxR1 and luxR2 genes was evaluated in Escherichia coli cells with use of transcriptional fusions of luxR1 and luxR2 promoter/operator regions with the Photorhabdus luminescens luxCDABE reporter gene cassette. Expression of the luxR1 and luxR2 genes was shown to largely depend on the CRP as activator. The hns::kan mutation increases the expression of luxR2 gene by two to three orders of magnitude and luxR1 gene by two to threefold.

Seasonal changes in luminescent intestinal microflora of the fish inhabiting the Bering and Okhotsk seas.

Here, we present a study of luminescent intestinal microflora of the fish inhabiting Bering and Okhotsk seas in summer and winter seasons. Sampling of intestinal luminescent microflora was carried for several years, with all recovered species belonging to psychrophilic bacteria of either Aliivibrio logei or Photobacterium phosphoreum species. A seasonal change in fish intestinal luminescent microflora detected include an increase in prevalence of P.

A combination of luxR1 and luxR2 genes activates Pr-promoters of psychrophilic Aliivibrio logei lux-operon independently of chaperonin GroEL/ES and protease Lon at high concentrations of autoinducer.

Unlabelled: Lux-operon of psychrophilic bacteria Aliivibrio logei contains two copies of luxR and is regulated by Type I quorum sensing (QS). Activation of lux-operon of psychrophilic bacteria A. logei by LuxR1 requires about 100 times higher concentrations of autoinducer (AI) than the activation by LuxR2.

-operon of the marine psychrophilic bacterium : a comparative analysis of the LuxR1/LuxR2 regulatory activity in cells.

The -operon of the psychrophilic bioluminescent bacterium is regulated by quorum sensing (QS). The key components of this system are LuxI, which catalyses synthesis of the autoinducer (AI), and LuxR, which activates transcription of the entire -operon. The -operon of contains two copies of the gene: and .