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Rhodamine 19 Alkyl Esters as Effective Antibacterial Agents.
Int J Mol Sci
June 2024
Belozersky Institute of Physico-Chemical Biology, Lomonosov Moscow State University, 119991 Moscow, Russia.
Mitochondria-targeted antioxidants (MTAs) have been studied quite intensively in recent years as potential therapeutic agents and vectors for the delivery of other active substances to mitochondria and bacteria. Their most studied representatives are MitoQ and SkQ1, with its fluorescent rhodamine analog SkQR1, a decyl ester of rhodamine 19 carrying plastoquinone. In the present work, we observed a pronounced antibacterial action of SkQR1 against Gram-positive bacteria, but virtually no effect on Gram-negative bacteria.
View Article and Find Full Text PDFThe regulation of light quality on the substance production and photosynthetic activity of Dunaliella bardawil.
J Photochem Photobiol B
March 2024
College of Environmental Science & Engineering, Yangzhou University, 196 Huayang West Street, Hanjiang District, Yangzhou City, Jiangsu Province, China; Marine Science & Technology Institute, Yangzhou University, 196 Huayang West Street, Hanjiang District, Yangzhou City, Jiangsu Province, China. Electronic address:
To study the influence and regulation of light quality on the microalgal photosynthetic activity and production of biomass and substances, green alga Dunaliella bardawil was cultured in this study under the monochromatic red light (7R0B), blue light (0R7B), and their combinations with different ratios (xRyB, x + y = 7), as well as a control of white light (W). The results demonstrated that the only advantage for control W was its chlorophyll-a (Chl-a) and Chl-b contents. All substance production at 7R0B were much lower than at control W, except of glycerol.
View Article and Find Full Text PDFProximity to Photosystem II is necessary for activation of Plastid Terminal Oxidase (PTOX) for photoprotection.
Nat Commun
January 2024
Department of Earth and Environmental Sciences, Faculty of Science and Engineering, University of Manchester, Manchester, United Kingdom.
The Plastid Terminal Oxidase (PTOX) is a chloroplast localized plastoquinone oxygen oxidoreductase suggested to have the potential to act as a photoprotective safety valve for photosynthesis. However, PTOX overexpression in plants has been unsuccessful at inducing photoprotection, and the factors that control its activity remain elusive. Here, we show that significant PTOX activity is induced in response to high light in the model species Eutrema salsugineum and Arabidopsis thaliana.
View Article and Find Full Text PDFDnaK2 Mediates a Negative Feedback Regulation of the Heat Shock Responsive Hik2-Rre1 Two-Component System in the Cyanobacterium Synechococcus Elongatus PCC 7942.
Plant Cell Physiol
January 2024
Laboratory for Chemistry and Life Science, Institute of Innovative Research, Tokyo Institute of Technology, Yokohama, 226-8501 Japan.
The two-component system (TCS) is a conserved signal transduction module in bacteria. The Hik2-Rre1 system is responsible for transcriptional activation upon high-temperature shift as well as plastoquinone-related redox stress in the cyanobacterium Synechococcus elongatus PCC 7942. As heat-induced de novo protein synthesis was previously shown to be required to quench the heat-activated response, we investigated the underlying mechanism in this study.
View Article and Find Full Text PDFComputer-Aided and AILDE Approaches to Design Novel 4-Hydroxyphenylpyruvate Dioxygenase Inhibitors.
Int J Mol Sci
July 2022
Department of Applied Chemistry, College of Arts and Sciences, Northeast Agricultural University, Harbin 150030, China.
4-Hydroxyphenylpyruvate dioxygenase (HPPD) is a pivotal enzyme in tocopherol and plastoquinone synthesis and a potential target for novel herbicides. Thirty-five pyridine derivatives were selected to establish a Topomer comparative molecular field analysis (Topomer CoMFA) model to obtain correlation information between HPPD inhibitory activity and the molecular structure. A credible and predictive Topomer CoMFA model was established by "split in two R-groups" cutting methods and fragment combinations ( = 0.
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