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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Sukovatyi L. A., Lisitsa A. E., Kratasyuk V. A., Nemtseva E. V.
Заглавие : The Effect of Osmolytes on the Bioluminescent Reaction of Bacteria: Structural and Dynamic Properties
Место публикации : Biophysics: Pleiades journals, 2020. - Vol. 65, Is. 6. - С. 966-971. - ISSN 00063509 (ISSN), DOI 10.1134/S0006350920060202
Аннотация: The effects of viscous media with glycerol and sucrose (10–40%) on the kinetics of the bacterial bioluminescent reaction have been investigated by stopped-flow technique. Increment of quantum yield in media with 10% of both osmolytes was shown. Higher concentrations of glycerol, up to 30–40%, were found to reduce the efficiency of the reaction, while this effect was not observed in the media with sucrose. The molecular dynamics simulation was used to study the structure of bacterial luciferase surrounded by either water molecules solely or by mixture of water with various numbers of glycerol/sucrose molecules. It was found that both cosolvents at studied concentrations did not cause a significant change in conformation of bacterial luciferase. The calculated root-mean-square fluctuation for C?-atoms of bacterial luciferase ?-subunit indicated that the higher flexibility of the enzyme mobile loop could be responsible for increment of quantum yield in the presence of 10% of both osmolytes. The active site of bacterial luciferase was found to be accessible for glycerol molecules while sucrose did not enter catalytic gorge. Moreover, at 30 and 40% concentration the glycerol molecules were found to locate in the active site of bacterial luciferase throughout the whole simulation time. © 2020, Pleiades Publishing, Inc.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Ushakova S.A., Kovaleva N.P., Tikhomirova N.A., Gribovskaya I.V., Kolmakova A.A.
Заглавие : Effect of photosynthetically active radiation, salinization, and type of nitrogen nutrition on growth of Salicornia europaea plants
Место публикации : Russian Journal of Plant Physiology. - 2006. - Vol. 53, Is. 6. - С. 785-792. - ISSN 10214437 (ISSN) , DOI 10.1134/S1021443706060094
Ключевые слова (''Своб.индексиров.''): nacl salinization--photosynthetically active radiation--productivity--salicornia europaea--types of nitrogen nutrition--salicornia europaea
Аннотация: Effects of various combinations of nutrient solution salinity (0.3, 171, and 342 mM NaCl), photosynthetically active radiation (PAR) of 600 or 1150 ?mol/(m2 s), and type of nitrogen nutrition (amide-N or nitrate-N) on the productivity and the content of accumulated mineral nutrients and free amino acids were studied in Salicornia europaea plants. At PAR of 600 ?mol/(m2 s), plant productivity increased with elevation of salinity level; at 1150 ?mol/(m2 s), the maximum productivity was observed in the plants grown at 171 mM of NaCl. The content of free amino acids in shoots, regardless of PAR, decreased with growing salinity level, whereas Na content, on the opposite, increased. Glutamic acid, rather than proline, was shown to be the main organic osmolyte in this plant species. Comparison of the productivity of plants grown on solutions with amide (urea) or nitrate nitrogen showed that higher biomass accumulation was achieved in the former case. В© 2006 Nauka/Interperiodica.
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