The relationship between photosystem II regulation and light-dependent hydrogen production by microalgae.

Certain microalgae species are capable of light-dependent hydrogen production under conditions of dark anaerobic incubation or nutrient deprivation. From the biotechnological point of view, this phenomenon is a process of synthesizing the energy carrier H while consuming light energy. Here, we overview the functional connection between the photosynthetic machinery and light-dependent hydrogen production and assess the physiological significance of this process.

"Microalgae as converters of light energy into biofuels and high-value products": a session of the Russian Photobiology Society 9th Congress (Shepsi, Krasnodar region, Russia; September, 12-19, 2021).

An outline of the "Microalgae as converters of light energy into biofuels and high-value products" section of the 9th Congress of the Russian Photobiological Society is presented. Key talks and poster presentations are briefly introduced along with key findings made by their authors. We conclude that this section was a success with many interesting talks and a vigorous follow-up discussion indicative of the keen interest of Russian researchers in microalgae and biotechnologies based on these microorganisms.

Commentary to "Biophotonics of molecules and nanoparticles": a session of the Russian Photobiology Society 9th Congress Shepsi, Krasnodar region, Russia; September 12-19, 2021.

Commentaries on the section "Biophotonics of molecules and nanoparticles" of the 9th Congress of the Russian Photobiological Society are presented. Presentations are briefly introduced along with the main conclusions made by their authors. This section included a plenary lecture, oral presentations, and posters with interesting talks and follow-up discussions.

Reconstitution of the functional Carotenoid-Binding Protein from silkworm in E. coli.

Natural water-soluble carotenoproteins are promising antioxidant nanocarriers for biomedical applications. The Carotenoid-Binding Protein from silkworm Bombyx mori (BmCBP) is responsible for depositing carotenoids in cocoons. This determines the silk coloration, which is relevant for sericulture for four thousand years.

Complete Genome Analysis of S8 Capable of Degrading Alkanes and Producing Biosurfactant Reveals Its Genetic Adaptation for Crude Oil Decomposition.

Microorganisms capable of decomposing hydrophobic substrates in cold climates are of considerable interest both in terms of studying adaptive reactions to low temperatures and in terms of their application in biotechnologies for cleaning up oil spills in a crude-oil polluted soil. The aim of this work was to investigate the genome of S8 and explore behavior traits of this strain grown in the presence of hexadecane. The genome size of strain S8 is 8.

Call for contributions to the Special Issue on the 9th Congress of the Russian Photobiological Society held in Shepsi, Krasnodar region, Russia, on September 12-19, 2021.

This Commentary describes a call for submissions for the upcoming Special Issue focused on the science presented at the 9th Congress of The Russian Photobiological Society entitled "Actual Problems in Photobiology."

The HydS C-terminal domain of the Thiocapsa bogorovii HydSL hydrogenase is involved in membrane anchoring and electron transfer.

Thiocapsa bogorovii BBS (former name Thiocapsa roseopersicina) contains HydSL hydrogenase belonging to 1e subgroup of NiFe hydrogenases (isp-type). The operon of these hydrogenases contains gene for small subunit (hydS), gene for large subunit (hupL), and genes isp1 and isp2 between them. It is predicted that last two genes code electron transport careers for electron transfer from/to HydSL hydrogenase.

'Candidatus Chloroploca mongolica' sp. nov. a new mesophilic filamentous anoxygenic phototrophic bacterium.

A mesophilic filamentous anoxygenic phototrophic bacterium, designated M50-1, was isolated from a microbial mat of the Chukhyn Nur soda lake (northeastern Mongolia) with salinity of 5-14 g/L and pH 8.0-9.3.

Lack of Excitation Energy Transfer from the Bacteriochlorophyll Soret Band to Carotenoids in Photosynthetic Complexes of Purple Bacteria.

The excitation energy transfer (EET) from the bacteriochlorophyll (BChl) Soret band to the second excited state(s) (S) of carotenoids in pigment-protein complexes of purple bacteria was investigated. The efficiency of EET was determined, based on fluorescence excitation and absorption spectra of chromatophores, peripheral light-harvesting complexes (LH2), core complexes (LH1-RC), and pigments in solution. Carotenoid-containing and carotenoid-less samples were compared: LH1-RC and LH2 from , , and chromatophores from and wild type and carotenoid-free strains R-26 and G9.

'Candidatus Oscillochloris kuznetsovii' a novel mesophilic filamentous anoxygenic phototrophic Chloroflexales bacterium from Arctic coastal environments.

Chloroflexales bacteria are mostly known as filamentous anoxygenic phototrophs that thrive as members of the microbial communities of hot spring cyanobacterial mats. Recently, we described many new Chloroflexales species from non-thermal environments and showed that mesophilic Chloroflexales are more diverse than previously expected. Most of these species were isolated from aquatic environments of mid-latitudes.

gen. nov., sp. nov., the first bacteriochlorophyll -containing, psychrophilic and acidophilic bacteriobiont of lichen species.

Gram-negative, aerobic, chemo-organotrophic and bacteriochlorophyll -containing bacterial strains, KEBCLARHB70R, KAMCLST3051 and KAMCLST3152, were isolated from the thalli of and lichens. Cells from the strains were coccoid and reproduced by binary division. They were motile at the early stages of growth and utilized sugars and alcohols.

'Candidatus Oscillochloris fontis': a novel mesophilic phototrophic Chloroflexota bacterium belonging to the ubiquitous Oscillochloris genus.

We present the results of a study of mesophilic anoxygenic phototrophic Chloroflexota bacteria from Mechigmen hot spring (the Chukotka Peninsula) and Siberia. According to 16S rRNA phylogenetic analysis, these bacteria belong to Oscillochloris trichoides. However, sequencing the draft genome of the bacterium from the Chukotka and analysis of the average nucleotide identity, as well as in silico DNA-DNA hybridization, reveal that this bacterium belongs to a novel species within the Oscillochloris genus.

'Candidatus Viridilinea mediisalina', a novel phototrophic Chloroflexi bacterium from a Siberian soda lake.

In this article, we present the description of a novel mesophilic phototrophic Chloroflexi bacterium, 'Candidatus Viridilinea mediisalina' Kir15-3F. We have isolated an anaerobic, highly enriched culture of this bacterium from the Kiran soda lake (Siberia) and optimized its cultivation. Metagenomic sequencing revealed that 'Ca.

The presence of the low molecular mass carbonic anhydrase in photosystem II of C3 higher plants.

The carrier of carbonic anhydrase (CA) activity was detected in gel among low molecular mass proteins from pea, spinach and Arabidopsis, after nondenaturing electrophoresis in PAAG of the dodecyl-β-d-maltoside treated PSII membranes (the fragments of thylakoid membrane containing PSII complexes). The elimination of Mn-stabilizing protein PsbO by treatment of PSII membranes with salts, did not lead to a decrease in CA activity observed in the gel although it reduced the amount of this protein down to 25% compared to the original sample. The isolated protein PsbO did not demonstrated CA activity.

Carbonic anhydrase activity in Arabidopsis thaliana thylakoid membrane and fragments enriched with PSI or PSII.

The procedure of isolating the thylakoids and the thylakoid membrane fragments enriched with either photosystem I or photosystem II (PSI- and PSII-membranes) from Arabidopsis thaliana leaves was developed. It differed from the one used with pea and spinach in durations of detergent treatment and centrifugation, and in concentrations of detergent and Mg(2+) in the media. Both the thylakoid and the fragments preserved carbonic anhydrase (CA) activities.