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排序方式: 共有187条查询结果,搜索用时 15 毫秒
1.
Binding of the cationic tetra(tributylammoniomethyl)-substituted hydroxoaluminum phthalocyanine (AlPcN4) to bilayer lipid membranes was studied by fluorescence correlation spectroscopy (FCS) and intramembrane field compensation (IFC) methods. With neutral phosphatidylcholine membranes, AlPcN4 appeared to bind more effectively than the negatively charged tetrasulfonated aluminum phthalocyanine (AlPcS4), which was attributed to the enhancement of the coordination interaction of aluminum with the phosphate moiety of phosphatidylcholine by the electric field created by positively charged groups of AlPcN4. The inhibitory effect of fluoride ions on the membrane binding of both AlPcN4 and AlPcS4 supported the essential role of aluminum-phosphate coordination in the interaction of these phthalocyanines with phospholipids. The presence of negative or positive charges on the surface of lipid membranes modulated the binding of AlPcN4 and AlPcS4 in accord with the character (attraction or repulsion) of the electrostatic interaction, thus showing the significant contribution of the latter to the phthalocyanine adsorption on lipid bilayers. The data on the photodynamic activity of AlPcN4 and AlPcS4 as measured by sensitized photoinactivation of gramicidin channels in bilayer lipid membranes correlated well with the binding data obtained by FCS and IFC techniques. The reduced photodynamic activity of AlPcN4 with neutral membranes violating this correlation was attributed to the concentration quenching of singlet excited states as proved by the data on the AlPcN4 fluorescence quenching. 相似文献
2.
N P Mikha?lova N I Khromov-Borisov L V Rodina L R Davidenkov L D Antonenko 《Genetika》1984,20(12):2075-2077
A simple procedure for induction of nistatin-resistant mutants in yeasts under the action of 6-N-hydroxylaminopurine (HAP) is proposed. Some differences between the spectra of mutations induced by HAP and UV-light are observed: HAP induces dominant and double recessive mutants more frequently. 相似文献
3.
E. P. Lukhanina O. A. Laponogov V. I. Tsimbalyuk N. G. Matyuk V. G. Antonenko Yu. M. Medvedev 《Neurophysiology》1993,25(4):204-209
In the course of neurosurgical interventions in 40 patients with parkinsonism and torsion muscle dystonia, the background activity (BA) was recorded from 124 neurons of the ventrolateral nucleus (VL) of the thalamus with the aid of microelectrodes during demarcation of boundaries between nuclear structures, and identification of zones within a nucleus. The following characteristic features of the BA in patients with parkinsonism were found: a relatively large proportion (71%) of cells with a burst pattern of activity; a great diversity of burst duration in the activity (short or prolonged bursts); a large proportion (67%) of cells with cyclic changes in the BA frequency; diverse patterns of cyclic modulation, where periods varied from fractions of a second (0.2–0.8 sec) to seconds (2–10 sec) or to tens of seconds (20–40 sec); cyclic successions of spike bursts with the rhythm typical of the peripheral tremor (3–7/sec) in a substantial proportion (40%) of the units.The background spike trains recorded in patients with torsion muscle dystonia consisted of separated spikes in the majority (69%) of units. Only short high-frequency discharges were found in the burst activity in this group; a cyclic BA pattern occurred much less frequently (in 23% of neurons); burst discharges at a 3–4/sec frequency were found only in 4% of the examined cells.The possible nature of motor disorders in patients with parkinsonism and torsion muscle dystonia and the mechanisms of the curing effects of cryodestruction of theVL of the thalamus in the treatment of the disease are discussed.Neirofiziologiya/Neurophysiology, Vol. 25, No. 4, pp. 246–253, July–August, 1993. 相似文献
4.
Antonenko YN Rokitskaya TI Kotova EA Agapov II Tonevitsky AG 《Biochemistry. Biokhimii?a》2004,69(2):220-227
Biotin-avidin (or streptavidin) high affinity binding has been widely applied as a universal tool for basic research as well as diagnostic and therapeutic purposes. Here we studied the interaction of streptavidin with ionic channels formed by biotinylated gramicidin in planar bilayer lipid membranes (BLM) using the method of sensitized photoinactivation. As shown previously, the addition of streptavidin leads to a profound increase in the lifetime (tau) of gA5XB, a biotinylated analog of gramicidin A with a linker arm of five aminocaproyl groups (Rokitskaya et al. (2000) Biochemistry, 39, 13053-13058). The present study has revealed that the increase in tau is related to multivalent interaction of streptavidin with biotinylated gramicidin, i.e., to formation of a complex of streptavidin with several gramicidin channels, whereas binding of streptavidin to a single channel does not change the value of tau. A rather long linker arm attaching biotin to the C-terminus of gramicidin appeared to be required for the multivalent interaction of streptavidin with gramicidin channels, as the increase in tau was not observed with channels formed by gA2XB, the biotinylated gramicidin analog with a linker arm comprising only two aminocaproyl groups. However, the formation of a stoichiometric (1 : 1) complex of streptavidin with gA2XB apparently occurred. The multivalent interaction of streptavidin with gA5XB disappeared if biotinylated lipids were included into the diphytanoylphosphatidylcholine membrane. It is suggested that the slowing of gramicidin channel kinetics provoked by streptavidin binding is due to membrane-mediated elastic interactions between two neighboring channels. 相似文献
5.
In the adoptive transfer of cells obtained from the thymus, lymph nodes and the spleen to intact syngeneic animals the suppression of immune response was induced by lymph node cells. If the donors were previously sensitized, the cells of the thymus and lymph nodes showed suppressive activity in the adoptive transfer test. A single injection of antilymphocytic serum to the donors of lymphoid cells, previously sensitized with sheep red blood cells, enhanced the immunosuppressing action of thymocytes and lymph node cells. 相似文献
6.
Problems concerning synthesis of fructose-1,6-diphosphataldolase A (EC 4.1.2.13) in vitro, and localization in a cell and sizes of mRNA of this enzyme are considered in the review. The following items are described: methods for production and properties of individual mRNA and cDNA of the aldolase isoenzymes; making of the amino acid sequence of the aldolase isoenzyme forms according to the nucleotide sequence of mRNA and cDNA and peculiarities of isoform structure in different tissues of animals; structure of mRNA and cDNA of FDP-aldolase in the norm and under pathology and mechanisms of the appearance of nonspecific enzyme isoforms. Regulation of protein biosynthesis under pathology is considered as exemplified by mRNA and cDNA of FDP-aldolase. 相似文献
7.
Liamkin GI Taran IF Briukhanova GD Maletskaia OV Liapustina LV Antonenko AD 《Zhurnal mikrobiologii, epidemiologii, i immunobiologii》2003,(6):76-78
The emergency situation caused by inundations and high floods on the rivers in the affected regions exerts no direct influence on brucellosis morbidity among humans. Still the urgent evacuation of agricultural animals in connection with the natural calamity, their displacement and regrouping give grounds to prognosticate the deterioration of the epizootic situation in this infection in a number of regions of the territory where no sufficient veterinary surveillance has been ensured. 相似文献
8.
Positive and negative selection on the total length of two fragments of an interrupted longitudinal wing vein in an isogenic line of Drosophila melanogaster was accompanied by changes in the genomic localization pattern of MGE 412. Strong truncation selection was conducted in the population of effective size Ne = 160 for 50 generations. Twenty-six out of 35 polymorphic HHS-induced segments of MGE localization behaved as independent copies and markers, whereas 9 segments proved to be selective. The second group included "hot" segments of HHS transposition induction (43B, 97E, etc.). Thus, final consensus patterns of induced MGE transpositions have a random and an adaptive component in generation 50 of positive and negative selection. Selective patterns probably include modifier MGEs, which generate induced genetic regulatory variation of polygenes controlling the selected quantitative trait in the isogenic line after HHS. 相似文献
9.
Krylov AV Kotova EA Yaroslavov AA Antonenko YN 《Biochimica et biophysica acta》2000,1509(1-2):373-384
Functioning of membrane proteins, in particular ionic channels, can be modulated by alteration of their arrangement in membranes. We addressed this issue by studying the effect of different chain length polylysines on the kinetics of ionic channels formed in a bilayer lipid membrane (BLM) by O-pyromellitylgramicidin carrying three negative charges at the C-terminus. The method of sensitized photoinactivation was applied to the analysis of the channel association-dissociation kinetics (characterized by the exponential factor of the curve describing the time course of the flash-induced decrease in the transmembrane current, tau). Addition of polylysine to the bathing solutions of BLM led to the deceleration of the photoinactivation kinetics, i.e. to the increase in tau. It was shown here that for a series of polylysines differing in their chain lengths, the value of tau grew as their concentration increased above a threshold level until at a certain concentration of each polylysine tau reached maximum. At higher polylysine concentrations tau began to decrease and finally became close to the control level observed in the absence of polylysine. With lengthening of the polylysine chain the maximum value of tau increased, the concentration dependence became steeper, and the threshold concentration decreased. The increase in the ionic strength of the medium shifted the concentration dependence of tau to higher polylysine concentrations and decreased the maximum value of tau. It was concluded that the increase in tau was caused by the formation of domains of O-pyromellitylgramicidin molecules induced by binding of polylysines. This can be related to functional aspects of polycation-induced sequestering of negatively charged transmembrane peptides in neutral membranes. 相似文献
10.
Elena O. Omarova Pavel A. Nazarov Alexander M. Firsov Marina G. Strakhovskaya Anastasia Yu. Arkhipova Mikhail M. Moisenovich Igor I. Agapov Valentina A. Ol’shevskaya Andrey V. Zaitsev Valery N. Kalinin Elena A. Kotova Yuri N. Antonenko 《PloS one》2015,10(11)
Antimicrobial photodynamic inactivation is currently being widely considered as alternative to antibiotic chemotherapy of infective diseases, attracting much attention to design of novel effective photosensitizers. Carboranyl-chlorin-e6 (the conjugate of chlorin e6 with carborane), applied here for the first time for antimicrobial photodynamic inactivation, appeared to be much stronger than chlorin e6 against Gram-positive bacteria, such as Bacillus subtilis, Staphyllococcus aureus and Mycobacterium sp. Confocal fluorescence spectroscopy and membrane leakage experiments indicated that bacteria cell death upon photodynamic treatment with carboranyl-chlorin-e6 is caused by loss of cell membrane integrity. The enhanced photobactericidal activity was attributed to the increased accumulation of the conjugate by bacterial cells, as evaluated both by centrifugation and fluorescence correlation spectroscopy. Gram-negative bacteria were rather resistant to antimicrobial photodynamic inactivation mediated by carboranyl-chlorin-e6. Unlike chlorin e6, the conjugate showed higher (compared to the wild-type strain) dark toxicity with Escherichia coli ΔtolC mutant, deficient in TolC-requiring multidrug efflux transporters. 相似文献