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Doklady. Biochemistry and Biophysics

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https://www.readbyqxmd.com/read/29779115/the-first-recombinant-viper-three-finger-toxins-inhibition-of-muscle-and-neuronal-nicotinic-acetylcholine-receptors
#1
Ya V Makarova, E V Kryukova, I V Shelukhina, D S Lebedev, T V Andreeva, D Yu Ryazantsev, S V Balandin, T V Ovchinnikova, V I Tsetlin, Yu N Utkin
Genes encoding two three-finger toxins TFT-AF and TFT-VN, nucleotide sequences of which were earlier determined by cloning cDNA from venom glands of vipers Azemiops feae and Vipera nikolskii, respectively, were expressed for the first time in E. coli cells. The biological activity of these toxins was studied by electrophysiological techniques, calcium imaging, and radioligand analysis. It was shown for the first time that viper three-finger toxins are antagonists of nicotinic acetylcholine receptors of neuronal and muscle type...
March 2018: Doklady. Biochemistry and Biophysics
https://www.readbyqxmd.com/read/29779114/general-sources-of-dopamine-as-a-potential-morphogenic-factor-in-the-developing-striatum-of-rats
#2
A I Kurtova, L K Dil'mukhametova, E R Mingazov, M V Ugrumov
In the striatum of rats at different stages of development, we determined the content of tyrosine hydroxylase and aromatic L-amino acids decarboxylase using double immunohistochemical labeling and estimated the expression level of their transcripts by real-time PCR. We found that, in different periods of development, there are three sources of dopamine in the striatum of rats: bienzymatic nerve fibers (throughout ontogeny), bienzymatic neurons (appear on day 18 of embryonic development), and monoenzymatic neurons (in adult animals)...
March 2018: Doklady. Biochemistry and Biophysics
https://www.readbyqxmd.com/read/29779113/preparation-and-properties-of-nanoparticles-trna-bivalent-metal-cation-me-2-complexes-and-prospects-of-their-practical-use
#3
V N Danilevich, V V Sorokin, Ya P Moiseev, S V Sizova
The patterns of formation of RNA nanoparticles (NPs) during thermal cycling of bacterial total tRNA in the presence of cations Ca2+ , Mn2+ , Ni2+ , Zn2+ , Co2+ , and Cu2+ were studied. The optimal conditions for the production of NPs were found, and it was revealed that their size depends on the ratio of the concentrations of Me2+ and tRNA. The concentration of reagents for obtaining NPs of small size (from 5 to 100 nm) was selected. It was shown that tRNA-based nanoparticles can comprise short (20-50 nt) ribooligonucleotides, including aptamers and siRNAs...
March 2018: Doklady. Biochemistry and Biophysics
https://www.readbyqxmd.com/read/29779112/border-structure-of-intercalary-heterochromatin-bands-of-drosophila-melanogaster-polytene-chromosomes
#4
V A Khoroshko, T Yu Zykova, O O Popova, I F Zhimulev
The precise genomic localization of the borders of 62 intercalary heterochromatin bands in Drosophila polytene chromosomes was determined. A new type of bands containing chromatin of different states was identified. This type is a combination of the gray band and the intercalary heterochromatin band, creating a genetic structure that with a light microscope is identified as a continuous band. The border structure of such bands includes the coding regions of genes with ubiquitous activity.
March 2018: Doklady. Biochemistry and Biophysics
https://www.readbyqxmd.com/read/29779111/magnetosensitivity-of-e-coli-bacteria-in-the-presence-of-zinc-isotopes
#5
U G Letuta, D M Shailina
The combined effect of the zinc magnetic isotope 67 Zn and weak magnetic field 25-35 mT causes a 2-4-fold increase in the colony-forming ability of bacteria E. coli in comparison with the nonmagnetic isotopes 64, 66 Zn. The effects of magnetic field in the range of 2.2-8 mT were detected for all bacteria regardless of the zinc-isotope enrichment of the media. This indicates the sensitivity of intracellular processes to weak magnetic fields. An increase in the ATP concentration in E. coli cells was only detected for the bacteria grown on the medium with the magnetic zinc isotope in the range of 2...
March 2018: Doklady. Biochemistry and Biophysics
https://www.readbyqxmd.com/read/29779110/translocation-of-oligonucleotide-oligosaccharide-complexes-into-cells-of-the-brain
#6
N N Dygalo, T S Kalinina, D A Lanshakov
Irradiation of a mixture of oligonucleotides with dextran resulted in the formation of a complex that is detected by a decelerated migration of an irradiated sample in electrophoretic gel compared to a non-irradiated one. When injected into the brain of neonatal rats, the formed complex penetrated into the cells 3 times easier compared to the original oligonucleotide, thus indicating that the use of radiation crosslinking of oligonucleotides with oligosaccharides is promising to enhance the efficiency of delivery of gene-targeted oligonucleotide drugs into cells...
March 2018: Doklady. Biochemistry and Biophysics
https://www.readbyqxmd.com/read/29779109/the-gene-encoding-the-universal-stress-protein-atusp-is-regulated-by-phytohormones-and-involved-in-seed-germination-of-arabidopsis-thaliana
#7
D S Gorshkova, I A Getman, A S Voronkov, S I Chizhova, Vl V Kuznetsov, E S Pojidaeva
For the first time, the organ-specific expression pattern of the AtUSP (At3g58450) gene, which also undergoes hormonal regulation, was shown. The USP protein encoded by this gene is involved in seed germination of Arabidopsis thaliana and, unlike abscisic acid, stimulates this process.
March 2018: Doklady. Biochemistry and Biophysics
https://www.readbyqxmd.com/read/29779108/microrna-dependent-regulation-of-igf1r-gene-expression-in-hormone-sensitive-and-hormone-resistant-prostate-cancer-cells
#8
V A Tarasov, M G Tyutyakina, M A Makhotkin, E F Shin, A V Naboka, A N Mashkarina, D A Chebotarev, E N Cherkasova, M I Kogan, M B Chibichyan, D G Matishov
Using multiple parallel sequencing on Illumina platform, we identified eight microRNAs that showed significant opposite changes of gene expression in cells of the hormone-sensitive LNCaP prostate cancer cell line and in cells of the hormone-resistant DU-145 cell line, in comparison to the microRNA expression in the normal prostate tissue cells. We found that the insulin-like growth factor 1 receptor (IGF1R) gene is a target of five microRNAs whose expression is increased in LNCaP cells and reduced in DU-145 cells...
March 2018: Doklady. Biochemistry and Biophysics
https://www.readbyqxmd.com/read/29779107/stabilization-of-butyrylcholinesterase-by-the-entrapment-into-the-natural-polymer-based-gels
#9
V I Lonshakova-Mukina, E N Esimbekova, V A Kratasyuk
A new method for obtaining stable butyrylcholinesterase (BuChE) samples based on the enzyme immobilization in starch and gelatin gels followed by drying is proposed. Coimmobilization of BuChE with the thiol group indicator 5,5'-dithiobis(2-nitrobenzoic) acid did not reduce the activity of BuChE, which allowed us to simplify the procedure and reduce the time of analysis of organophosphorus pesticides. The resulting immobilized samples retained activity for at least 300 days. BuChE samples based on the starch gel showed a greater sensitivity in the determination of pesticides as compared to the samples based on the gelatin gel...
March 2018: Doklady. Biochemistry and Biophysics
https://www.readbyqxmd.com/read/29779106/modular-nanotransporter-with-p21-fragment-inhibits-dna-repair-after-bleomycin-treatment
#10
T R Kamaletdinova, A A Rosenkranz, A V Ulasov, Y V Khramtsov, A D Tsvetkova, G P Georgiev, A S Sobolev
Modular nanotransporter (MNT) with C-terminal fragment of the p21 protein was synthesized and characterized, and its effect on DNA lesions was studied. This p21 fragment in MNT can significantly inhibit DNA repair in A431 human carcinoma cells after bleomycin treatment.
March 2018: Doklady. Biochemistry and Biophysics
https://www.readbyqxmd.com/read/29779105/guide-rna-design-for-crispr-cas9-mediated-potato-genome-editing
#11
A V Khromov, V A Gushchin, V I Timerbaev, N O Kalinina, M E Taliansky, V V Makarov
The activity of the pool of sgRNA molecules designed for different regions of potato coilin and phytoene desaturase genes was compared in vitro. Due to the presence of nucleotides unpaired with DNA, sgRNA is able not only to inhibit but also to stimulate the activity of the Cas9-sgRNA complex in vitro. Although the first six nucleotides located in the DNA substrate proximally to the PAM site at the 3' end are the binding sites for cas9, they had no significant effect on the activity of the Cas9-sgRNA complex...
March 2018: Doklady. Biochemistry and Biophysics
https://www.readbyqxmd.com/read/29779104/alternative-splicing-of-the-xmas-mrna-encoding-the-mrna-export-protein-in-drosophila-melanogaster
#12
D V Kopytova, Yu V Il'in, E N Nabirochkina
It is shown that Drosophila melanogaster has Xmas mRNA whose alternative splicing leads to the formation of three transcripts: Xmas, Xmas-2, and Xmas-1. As a result, three proteins are synthesized: Xmas, Xmas-2, and, presumably, Xmas-1. The size of the Xmas protein is close to the size of its homologue in humans. Adult flies contain large amounts of this protein, whereas in embryos it is absent.
March 2018: Doklady. Biochemistry and Biophysics
https://www.readbyqxmd.com/read/29779103/dopamine-synthesis-as-a-mechanism-of-brain-plasticity-in-nigrostriatal-system-pathology
#13
A A Kolacheva, M V Ugrumov
Using an experimental Parkinson's disease model (symptoms develop in mice after the injection of 1-methyl-4-phenyl-1,2,3,6-tetrahydropyridine), we studied the characteristics of the synthesis of dopamine as a possible compensatory mechanism aimed at maintaining the dopamine level in the dopaminergic neurons that survived in this pathology. We found no correlation between the content and activity of tyrosine hydroxylase in the nigrostriatal system. The enzyme activity and the dopamine content showed unidirectional changes in the substantia nigra, but not in the striatum, which is apparently due to triggering other compensatory mechanisms...
March 2018: Doklady. Biochemistry and Biophysics
https://www.readbyqxmd.com/read/29779102/insulator-protein-su-hw-is-indispensable-for-amplification-of-part-of-drosophila-amplicons-in-follicular-cells-dafcs-during-early-oogenesis
#14
A N Krasnov, N E Vorobyova, M Yu Mazina
We found that the Su(Hw) insulator protein binds to all known Drosophila amplicons in follicular cells (DAFCs). Su(Hw) binding is required for ORC replication complex positioning on part of DAFCs during early oogenesis. Our data allow us to expand the current view on the role of the Su(Hw) protein in Drosophila oogenesis as a transcription repressor. We assume that Su(Hw) is involved in the coordination of transcription and replication processes during oogenesis in Drosophila.
March 2018: Doklady. Biochemistry and Biophysics
https://www.readbyqxmd.com/read/29779101/the-role-of-epibionts-of-bacteria-of-the-genus-pseudoalteromonas-and-cellular-proteasomes-in-the-adaptive-plasticity-of-marine-cold-water-sponges
#15
O I Kravchuk, A I Lavrov, A D Finoshin, N G Gornostaev, A A Georgiev, S B Abaturova, V S Mikhailov, Yu V Lyupina
It was found that cells of different color morphs of the cold-water marine sponges Halichondria panicea (Pallas, 1766) of the class Demospongiae differ in the content of epibionts of bacteria of the genus Pseudoalteromonas. The sponge cells with elevated levels of epibionts of bacteria of the genus Pseudoalteromonas showed an increased expression of Hsp70 proteins but had a reduced level of the proteasomal catalytic beta 5 subunit, which was accompanied by a change in their activity. Probably, epibionts of bacteria of the genus Pseudoalteromonas may affect the ubiquitin-proteasome system in the cells of cold-water marine sponges and, thereby, ensure their adaptive plasticity...
March 2018: Doklady. Biochemistry and Biophysics
https://www.readbyqxmd.com/read/29779100/the-influence-of-myofibrils-on-the-proliferation-and-differentiation-of-myoblasts-cocultured-with-macrophages
#16
I V Kravchenko, V A Furalev, V O Popov
We studied the effect of myofibrils on proliferation and differentiation of myoblasts cocultured with macrophages as well as the effect of incubation of macrophages with myofibrils on the expression by macrophages of the compounds that are cytokines for muscle cells. In the cocultures, macrophages stimulated the proliferation of myoblasts. Myofibrils greatly enhanced the stimulating effect of macrophages, whereas lipopolysaccharide (LPS) completely abolished it. The culture medium conditioned by macrophages activated the proliferation of myoblasts that were incubated with myofibrils but inhibited it when myoblasts were incubated with LPS...
March 2018: Doklady. Biochemistry and Biophysics
https://www.readbyqxmd.com/read/29779099/the-differential-expression-of-adhesion-molecule-and-extracellular-matrix-genes-in-mesenchymal-stromal-cells-after-interaction-with-cord-blood-hematopoietic-progenitors
#17
L B Buravkova, E R Andreeva, M V Lobanova, E V Cotnezova, A I Grigoriev
The dynamics of the expression of genes encoding adhesion molecules, molecules of the connective tissue matrix, and its remodeling enzymes was studied in multipotent mesenchymal stromal cells (MSCs) from human adipose tissue after interaction with cord blood hematopoietic progenitors (HSPCs). An upregulation of ICAM1 and VCAM1, directly proportional to the coculture time (24-72 h), was found. After 72 h of culturing, a downregulation of the genes encoding the majority of matrix molecules (SPP1; COL6A2,7A1; MMP1,3; TIMP1,3; and HAS1) and cell-matrix adhesion molecules (ITGs) was revealed...
March 2018: Doklady. Biochemistry and Biophysics
https://www.readbyqxmd.com/read/29779098/stability-of-chromatin-remodeling-complex-subunits-is-determined-by-their-phosphorylation-status
#18
A M Azieva, A A Sheinov, F A Galkin, S G Georgieva, N V Soshnikova
It was found that, in the differentiated cells of mouse brain, the level of core (Brg1 and BAF155) and specific (BRD7, BAF180, and PHF10) subunits of the chromatin-remodeling complex PBAF is reduced compared to the undifferentiated proliferating cells. Phosphorylation of PBAF complex subunits is required for maintaining their stability in differentiated brain cells.
March 2018: Doklady. Biochemistry and Biophysics
https://www.readbyqxmd.com/read/29779097/mnt-optimization-for-intracellular-delivery-of-antibody-fragments
#19
A V Ulasov, Y V Khramtsov, T N Lupanova, A D Tsvetkova, A A Rosenkranz, T A Slastnikova, G P Georgiev, A S Sobolev
We studied the possibility of optimizing modular nanotransporters (MNTs) for the intracellular delivery of antibody fragments into the nuclei of cells of a specified type. Basic MNT with a reduced size retaining the desired functions was obtained, and the principal possibility of obtaining an MNT carrying an antibody fragment by microbiological synthesis was shown.
March 2018: Doklady. Biochemistry and Biophysics
https://www.readbyqxmd.com/read/29779096/the-status-of-the-hemostasis-system-under-the-influence-of-proline-peptides-during-the-development-of-experimental-metabolic-syndrome
#20
M E Grigorjeva, N F Myasoedov, L A Lyapina, T Y Obergan, L A Andreeva
A comparative study of the influence of regulatory proline peptides Pro-Gly-Pro, Pro-Arg-Pro, Pro-Gly-Pro-Leu, and Arg-Pro-Gly-Pro on the state of the hemostasis system was carried out in an experiment on male rats with metabolic syndrome. Under these conditions, repeated (7-fold) intranasal administration of the peptides in a daily dose of 50 μg/kg resulted in an increase in the anticoagulant potential of the blood, namely, in an increase in the anticoagulant, fibrinolytic, and antiplatelet activity 20 h and 7 days after the last peptide injection...
March 2018: Doklady. Biochemistry and Biophysics
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