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Effect of Light Regime on Puniceispirillum marinum IMCC1322 in Nutrient-Replete Conditions.
J Microbiol Biotechnol
November 2024
Hanyang University ERICA, Ansan 15588, Republic of Korea.
Previous studies showed no improvement in bacterial biomass for Puniceispirillum marinum IMCC1322 under light regimes. Nevertheless, in nutrient-replete cultures with higher inoculating cell densities, strain IMCC1322 exhibited proteorhodopsin photoheterotrophy. Increasing both inoculum size and the amino acid pool can eliminate quorum sensing and starvation responses in strain IMCC1322.
View Article and Find Full Text PDFPhosphorylation-Dependent Dispersion of the Response Regulator in Bacterial Chemotaxis.
J Mol Biol
February 2025
Department of Physics, University of Science and Technology of China, Hefei, Anhui 230026, China. Electronic address:
Protein phosphorylation is a fundamental cellular regulatory mechanism that governs the activation and deactivation of numerous proteins. In two-component signaling transduction pathways, the phosphorylation of response regulator proteins and their subsequent diffusion play pivotal roles in signal transmission. However, the impact of protein phosphorylation on their dispersion properties remains elusive.
View Article and Find Full Text PDFRemodeling of Individual Nucleosomes in Nucleosome Arrays.
Methods Mol Biol
December 2024
Institute of Physiological Chemistry, Faculty of Medicine Carl Gustav Carus, Technische Universität Dresden, Dresden, Germany.
Adenosin triphosphate (ATP)-dependent nucleosome remodeling factors sculpt the nucleosomal landscape of eukaryotic chromatin. They deposit, evict, or reposition nucleosomes along DNA in a process termed nucleosome sliding. Remodeling has traditionally been analyzed using mononucleosomes as a model substrate.
View Article and Find Full Text PDFAll eukaryotic SMC proteins induce a twist of -0.6 at each DNA loop extrusion step.
Sci Adv
December 2024
Department of Bionanoscience, Kavli Institute of Nanoscience Delft, Delft University of Technology, Delft, 2629HZ, Netherlands.
Eukaryotes carry three types of structural maintenance of chromosome (SMC) protein complexes, condensin, cohesin, and SMC5/6, which are ATP-dependent motor proteins that remodel the genome via DNA loop extrusion (LE). SMCs modulate DNA supercoiling but remains incompletely understood how this is achieved. Using a single-molecule magnetic tweezers assay that directly measures how much twist is induced by individual SMCs in each LE step, we demonstrate that all three SMC complexes induce the same large negative twist (i.
View Article and Find Full Text PDFHypoxia increases intracellular calcium in glutamate-activated horizontal cells of goldfish retina via mitochondrial K channels and intracellular stores.
Comp Biochem Physiol A Mol Integr Physiol
February 2025
Department of Biology, University of Ottawa, Ottawa, ON K1N 6N5, Canada; Brain and Mind Research Institute, University of Ottawa, Ottawa, ON K1H 8M5, Canada. Electronic address:
Central neurons of the common goldfish (Carassius auratus) are exceptional in their capacity to survive Ca-induced excitotoxicity and cell death during hypoxia. Horizontal cells (HCs) are inhibitory interneurons of the retina that are tonically depolarized by the neurotransmitter, glutamate, yet preserve intracellular Ca homeostasis. In HCs isolated from goldfish, and in the absence of glutamatergic input, intracellular Ca concentration ([Ca]) is protected from prolonged exposure to hypoxia by mitochondrial ATP-dependent K (mK) channel activity.
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