1
|
Vasilchenko AS, Gurina EV, Drozdov KA, Vershinin NA, Kravchenko SV, Vasilchenko AV. Exploring the antibacterial action of gliotoxin: Does it induce oxidative stress or protein damage? Biochimie 2023; 214:86-95. [PMID: 37356563 DOI: 10.1016/j.biochi.2023.06.009] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/23/2023] [Revised: 06/08/2023] [Accepted: 06/16/2023] [Indexed: 06/27/2023]
Abstract
The study aimed to investigate the effects of gliotoxin (GTX), a secondary fungal metabolite belonging to the epipolythiodioxopiperazines class, on Gram-positive and Gram-negative bacteria. While the cytotoxic mechanism of GTX on eukaryotes is well understood, its interaction with bacteria is not yet fully comprehended. The study discovered that S. epidermidis displayed a higher uptake rate of GTX than E.coli. However, Gram-negative bacteria required higher doses of GTX than Gram-positive bacteria to experience the bactericidal effect, which occurred within 4 h for both types of bacteria. The treatment of bioluminescent sensor E.coli MG1655 pKatG-lux with GTX resulted in oxidative stress. Pre-incubation with the antioxidant Trolox did not increase the GTX inhibitory dose, however, slightly increased the bacterial growth rate comparing to GTX alone. At the same time, we found that GTX inhibitory dose was significantly increased by the pretreatment of bacteria with 2-mercaptoethanol and reduced glutathione. Using another biosensor, E. coli MG1655 pIpbA-lux, we showed that bacteria treated with GTX exhibited heat shock stress. SDS-page electrophoresis demonstrated protein aggregation under the GTX treatment. In addition, we have found that gliotoxin's action on bacteria was significantly inhibited when zinc salt was added to the growth medium.
Collapse
Affiliation(s)
- Alexey S Vasilchenko
- Laboratory of Antimicrobial Resistance, Institute of Ecological and Agricultural Biology (X-BIO), Tyumen State University, Tyumen, Russia.
| | - Elena V Gurina
- Laboratory of Antimicrobial Resistance, Institute of Ecological and Agricultural Biology (X-BIO), Tyumen State University, Tyumen, Russia
| | - Konstantin A Drozdov
- G. B. Elyakov Pacific Institute of Bioorganic Chemistry Far Eastern Branch of Russian Academy of Sciences, Vladivostok, Russia
| | - Nikita A Vershinin
- Laboratory of Antimicrobial Resistance, Institute of Ecological and Agricultural Biology (X-BIO), Tyumen State University, Tyumen, Russia
| | - Sergey V Kravchenko
- Laboratory of Antimicrobial Resistance, Institute of Ecological and Agricultural Biology (X-BIO), Tyumen State University, Tyumen, Russia
| | - Anastasia V Vasilchenko
- Laboratory of Antimicrobial Resistance, Institute of Ecological and Agricultural Biology (X-BIO), Tyumen State University, Tyumen, Russia
| |
Collapse
|
2
|
Bröker KCA, Gailey G, Tyurneva OY, Yakovlev YM, Sychenko O, Dupont JM, Vertyankin VV, Shevtsov E, Drozdov KA. Site-fidelity and spatial movements of western North Pacific gray whales on their summer range off Sakhalin, Russia. PLoS One 2020; 15:e0236649. [PMID: 32797058 PMCID: PMC7428188 DOI: 10.1371/journal.pone.0236649] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/23/2020] [Accepted: 07/09/2020] [Indexed: 11/18/2022] Open
Abstract
The Western North-Pacific (WNP) gray whale feeding grounds are off the northeastern coast of Sakhalin Island, Russia and is comprised of a nearshore and offshore component that can be distinguished by both depth and location. Spatial movements of gray whales within their foraging grounds were examined based on 13 years of opportunistic vessel and shore-based photo-identification surveys. Site fidelity was assessed by examining annual return and resighting rates. Lagged Identification Rates (LIR) analyses were conducted to estimate the residency and transitional movement patterns within the two components of their feeding grounds. In total 243 individuals were identified from 2002-2014, among these were 94 calves. The annual return rate over the period 2002-2014 was 72%, excluding 35 calves only seen one year. Approximately 20% of the individuals identified from 2002-2010 were seen every year after their initial sighting (including eight individuals that returned for 13 consecutive years). The majority (239) of the WNP whales were observed in the nearshore area while only half (122) were found in the deeper offshore area. Within a foraging season, there was a significantly higher probability of gray whales moving from the nearshore to the offshore area. No mother-calf pairs, calves or yearlings were observed in the offshore area, which was increasingly used by mature animals. The annual return rates, and population growth rates that are primarily a result of calf production with little evidence of immigration, suggest that this population is demographically self-contained and that both the nearshore and offshore Sakhalin feeding grounds are critically important areas for their summer annual foraging activities. The nearshore habitat is also important for mother-calf pairs, younger individuals, and recently weaned calves. Nearshore feeding could also be energetically less costly compared to foraging in the deeper offshore habitat and provide more protection from predators, such as killer whales.
Collapse
Affiliation(s)
- Koen C. A. Bröker
- Marine Evolution and Conservation, Groningen Institute for Evolutionary Life Sciences, University of Groningen, Groningen, the Netherlands
- Shell Global Solutions International B.V., the Hague, The Netherlands
| | - Glenn Gailey
- Cetacean EcoSystem Research, Washington, Olympia, United States of America
| | - Olga Yu. Tyurneva
- A.V. Zhirmunsky National Scientific Center of Marine Biology of the Far Eastern Branch of the Russian Academy of Sciences (NSCMB FEB RAS), Vladivostok, Russian Federation
| | - Yuri M. Yakovlev
- A.V. Zhirmunsky National Scientific Center of Marine Biology of the Far Eastern Branch of the Russian Academy of Sciences (NSCMB FEB RAS), Vladivostok, Russian Federation
| | - Olga Sychenko
- Cetacean EcoSystem Research, Washington, Olympia, United States of America
| | - Jennifer M. Dupont
- ExxonMobil Upstream Research Company, Houston, Texas, United States of America
| | | | - Evgeny Shevtsov
- A.V. Zhirmunsky National Scientific Center of Marine Biology of the Far Eastern Branch of the Russian Academy of Sciences (NSCMB FEB RAS), Vladivostok, Russian Federation
| | - Konstantin A. Drozdov
- G.B. Elyakov Pacific Institute of Bioorganic Chemistry of the Far Eastern Branch of the Russian Academy of Sciences (PIBOC FEB RAS), Vladivostok, Russian Federation
| |
Collapse
|
3
|
Kotova MS, Drozdov KA, Dubinina TV, Kuzmina EA, Tomilova LG, Vasiliev RB, Dudnik AO, Ryabova LI, Khokhlov DR. In situ impedance spectroscopy of filament formation by resistive switches in polymer based structures. Sci Rep 2018; 8:9080. [PMID: 29899539 PMCID: PMC5998142 DOI: 10.1038/s41598-018-27332-1] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/04/2018] [Accepted: 05/29/2018] [Indexed: 11/18/2022] Open
Abstract
It is shown that the impedance spectroscopy allows identification of the resistive switching mechanisms in complex composite structures. This statement was demonstrated on an example of organic based sandwich structures with a modified polymer matrix as an active element. The impedance spectroscopy scanning was performed for a series of intermediate states formed within the switching process. Analysis of the experimentally obtained impedance spectra shows that the electron transport is provided by delocalized charge carriers and proceeds via conducting filaments formed in a highly resistive matrix. The filament configuration changes during the switching. With the shift from isolating to conducting states, single isolated filaments are reorganized into a branched network.
Collapse
Affiliation(s)
- M S Kotova
- Department of Physics, Lomonosov Moscow State University, 1 Leninskie Gory, Moscow, 119991, Russian Federation.
| | - K A Drozdov
- Department of Physics, Lomonosov Moscow State University, 1 Leninskie Gory, Moscow, 119991, Russian Federation
| | - T V Dubinina
- Department of Chemistry, Lomonosov Moscow State University, 1 Leninskie Gory, Moscow, 119991, Russian Federation.,Institute of Physiologically Active Compounds, Russian Academy of Sciences, 1 Severny proezd, 142432, Chernogolovka, Moscow Region, Russian Federation
| | - E A Kuzmina
- Department of Chemistry, Lomonosov Moscow State University, 1 Leninskie Gory, Moscow, 119991, Russian Federation
| | - L G Tomilova
- Department of Chemistry, Lomonosov Moscow State University, 1 Leninskie Gory, Moscow, 119991, Russian Federation.,Institute of Physiologically Active Compounds, Russian Academy of Sciences, 1 Severny proezd, 142432, Chernogolovka, Moscow Region, Russian Federation
| | - R B Vasiliev
- Department of Chemistry, Lomonosov Moscow State University, 1 Leninskie Gory, Moscow, 119991, Russian Federation
| | - A O Dudnik
- Department of Physics, Lomonosov Moscow State University, 1 Leninskie Gory, Moscow, 119991, Russian Federation
| | - L I Ryabova
- Department of Chemistry, Lomonosov Moscow State University, 1 Leninskie Gory, Moscow, 119991, Russian Federation
| | - D R Khokhlov
- Department of Physics, Lomonosov Moscow State University, 1 Leninskie Gory, Moscow, 119991, Russian Federation.,P.N. Lebedev Physical Institute, Leninskiy prosp. 53, 119991, Moscow, Russia
| |
Collapse
|
4
|
Galeeva AV, Krylov IV, Drozdov KA, Knjazev AF, Kochura AV, Kuzmenko AP, Zakhvalinskii VS, Danilov SN, Ryabova LI, Khokhlov DR. Electron energy relaxation under terahertz excitation in (Cd 1-x Zn x ) 3As 2 Dirac semimetals. Beilstein J Nanotechnol 2017; 8:167-171. [PMID: 28243553 PMCID: PMC5302011 DOI: 10.3762/bjnano.8.17] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 10/27/2016] [Accepted: 01/06/2017] [Indexed: 06/06/2023]
Abstract
We demonstrate that measurements of the photo-electromagnetic effect using terahertz laser radiation provide an argument for the existence of highly conductive surface electron states with a spin texture in Dirac semimetals (Cd1-x Zn x )3As2. We performed a study on a range of (Cd1-x Zn x )3As2 mixed crystals undergoing a transition from the Dirac semimetal phase with an inverse electron energy spectrum to trivial a semiconductor with a direct spectrum in the crystal bulk by varying the composition x. We show that for the Dirac semimetal phase, the photo-electromagnetic effect amplitude is defined by the number of incident radiation quanta, whereas for the trivial semiconductor phase, it depends on the laser pulse power, irrespective of wavelength. We assume that such behavior is attributed to a strong damping of the interelectron interaction in the Dirac semimetal phase compared to the trivial semiconductor, which may be due to the formation of surface electron states with a spin texture in Dirac semimetals.
Collapse
Affiliation(s)
- Alexandra V Galeeva
- Physics Department, M.V. Lomonosov Moscow State University, Leninskie Gory 1 bld.2, 119991 Moscow, Russia
| | - Ivan V Krylov
- Physics Department, M.V. Lomonosov Moscow State University, Leninskie Gory 1 bld.2, 119991 Moscow, Russia
| | - Konstantin A Drozdov
- Physics Department, M.V. Lomonosov Moscow State University, Leninskie Gory 1 bld.2, 119991 Moscow, Russia
| | - Anatoly F Knjazev
- Kursk Construction College, Sovetskaya str. 14, 305016 Kursk, Russia
| | - Alexey V Kochura
- South-West State University, 50 Let Oktyabrya str. 94, 305040 Kursk, Russia
| | | | | | - Sergey N Danilov
- Faculty of Physics, University of Regensburg, Universitaetstr. 31, 93053 Regensburg, Germany
| | - Ludmila I Ryabova
- Chemistry Department, M.V. Lomonosov Moscow State University, Leninskie Gory 1 bld.3, 119991 Moscow, Russia
| | - Dmitry R Khokhlov
- Physics Department, M.V. Lomonosov Moscow State University, Leninskie Gory 1 bld.2, 119991 Moscow, Russia
| |
Collapse
|
5
|
Drozdov KA, Khlistun OA, Drozdov AL. [The influence of ultrasound and constant magnetic field on gametes, zygotes, and embryos of the sea urchin]. Biofizika 2008; 53:513-518. [PMID: 18634327] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/26/2023]
Abstract
The influence of constant magnetic field, power 7 T, and ultrasound, frequency 2, 4 and 8 MHz, on gametes, fertization, embryos and larvae of the sea urchin was studied. It was shown that magnetic field breaks the process of the gamete fusion but does not influence gametes, embryos, and larvae. Ultrasound impairs the motility of spermatozoa and larvae, prevents the fertilization, and breaks the embryonic development. It is assumed that the effect of the magnetic field is connected with the response of the cortical cytoskeleton, which consists of bundles of actin microfilaments. The rearrangement of the cortical cytoskeleton occurs during the first 20 minutes after the contact of sperm with the egg. Also there is effect of magnetic fields on calcium ions, which are liberated during the first seconds after gamete contact. The effect of the ultrasound is explained by a small increase in water temperature and cavitation process, which break celluar structures.
Collapse
|