Membrane vesicles (MVs) are lumen-containing spheres of lipid bilayers secreted by all prokaryotes into the extracellular milieu. They have multifunctional roles in stress response, virulence transfer, biofilm formation, and microbial interactions. Remarkably, MVs contain various components, including lytic enzymes, genetic materials, and hydrophobic signals, at high concentrations and transfer them effectively to the target microbial cells. Therefore, MVs act as carriers for bactericidal effects, horizontal gene transfer, and quorum sensing. Although the purpose of secreted MVs remains unclear, recent reports have provided evidence that MVs selectively interact with microbial cells in order to transfer their content to the target species. Herein, we review microbial interactions using MVs and discuss MV-mediated selective delivery of their content to target microbial cells.
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http://dx.doi.org/10.2142/biophysico.16.0_114 | DOI Listing |
Plant Physiol Biochem
January 2025
Laboratory of Microbial Genetics, Department of Botany, Institute of Science, Banaras Hindu University, Varanasi, 221005, India. Electronic address:
Nitric oxide synthases (NOSs) are heme-based monooxygenases that catalyze the NADPH-dependent oxidation of L-arginine to produce NO and L-citrulline. Over the past five years, the identification and characterization of NOS homologs in cyanobacteria have significantly advanced our understanding of these enzymes. However, the precise mechanisms through which NOS-derived NO influences nitrogen metabolism remain incompletely elucidated.
View Article and Find Full Text PDFPLoS One
January 2025
Department of Pharmacognosy, Faculty of Pharmacy, Helwan University, Cairo, Egypt.
This study identifies the secondary metabolites from Alternaria alternate and evaluates their ACE-2: Spike RBD (SARS-CoV-2) inhibitory activity confirmed via immunoblotting in human lung microvascular endothelial cells. In addition, their in vitro anti-inflammatory potential was assessed using a cell-based assay in LPS-treated RAW 264.7 macrophage cells.
View Article and Find Full Text PDFProc Natl Acad Sci U S A
January 2025
Center for Physics and Biology, Rockefeller University, New York, NY 10065.
Life is invasive, occupying all physically accessible scales, stretching between almost nothing (protons, electrons, and photons) and almost everything (the whole biosphere). Motivated by seventeenth-century insights into this infinity, this paper proposes a language to discuss life as an infinite double cascade of machines making machines. Using this simplified language, we first discuss the micro-cascade proposed by Leibniz, which describes how the self-reproducing machine of the cell is built of smaller submachines down to the atomic scale.
View Article and Find Full Text PDFProc Natl Acad Sci U S A
January 2025
Frontiers Science Center for Synthetic Biology and Key Laboratory of Systems Bioengineering (Ministry of Education), School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, People's Republic of China.
Lignin degradation by biocatalysts is a key strategy to develop a plant-based sustainable carbon economy and thus alleviate global climate change. This process involves synergy between ligninases and auxiliary enzymes. However, auxiliary enzymes within secretomes, which are composed of thousands of enzymes, remain enigmatic, although several ligninolytic enzymes have been well characterized.
View Article and Find Full Text PDFAnnu Rev Pathol
January 2025
Diabetes Center and Department of Laboratory Medicine, University of California, San Francisco, California, USA;
The immune system plays fundamental roles in maintaining physiological homeostasis. With the increasing prevalence of obesity-a state characterized by chronic inflammation and systemic dyshomeostasis-there is growing scientific and clinical interest in understanding how obesity reshapes immune function. In this review, we propose that obesity is not merely an altered metabolic state but also a fundamentally altered immunological state.
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