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Screening a library of temperature-sensitive mutants to identify secretion factors in .
J Bacteriol
January 2025
Department of Microbiology, Howard Taylor Ricketts Laboratory, The University of Chicago, Chicago, Illinois, USA.
Protein secretion is an essential cell process in bacteria, required for cell envelope biogenesis, export of virulence factors, and acquisition of nutrients, among other important functions. In the Sec secretion pathway, signal peptide-bearing precursors are recognized by the SecA ATPase and pushed across the membrane through a translocon channel made of the proteins SecY, SecE, and SecG. The Sec pathway has been extensively studied in the model organism , but the Sec pathways of other bacteria such as the human pathogen differ in important ways from this model.
View Article and Find Full Text PDFBrassica rapa receptor-like cytoplasmic kinase BrRLCK1 negatively regulates freezing tolerance in transgenic Arabidopsis via the CBF pathway.
Gene
January 2025
Crop Research Institute, Gansu Academy of Agriculture Sciences, Lanzhou 730070, China.
Some winter rapeseed (Brassica rapa) varieties can endure extremely low temperatures (-20°C to -32°C). However, because of a lack of mutant resources, the molecular mechanisms underlying cold tolerance in B. rapa remain unclear.
View Article and Find Full Text PDFMagnolol as an Antibacterial Agent Against Drug-resistant Bacteria Targeting Filamentous Temperature-sensitive Mutant Z.
Chem Biodivers
December 2024
State Key Laboratory of Chemical Biology and Drug Discovery, and Department of Applied Biology and Chemical Technology, The Hong Kong Polytechnic University, Hong Kong, P. R. China.
The emergence of multiple drug-resistant bacteria poses critical health threats worldwide. It is urgently needed to develop potent and safe antibacterial agents with novel bactericidal mechanisms to treat these infections. In this study, magnolol was identified as a potential bacterial cell division inhibitor by a cell-based screening approach.
View Article and Find Full Text PDFTemperature-driven changes in membrane fluidity differentially impact FILAMENTATION TEMPERATURE-SENSITIVE H2-mediated photosystem II repair.
Plant Cell
December 2024
Shanghai Center for Plant Stress Biology, CAS Center for Excellence in Molecular Plant Sciences (CEMPS), Chinese Academy of Sciences, Shanghai 200032, China.
Article Synopsis
- The Arabidopsis var2 mutant, which lacks functional FtsH2, is key for studying the repair process of photosystem II (PSII) in plants.
- Under cold stress, var2 mutants struggle due to increased membrane viscosity, highlighting the essential need for FtsH2's substrate extraction activity to manage this condition.
- In contrast, during heat stress, the mutant behaves like normal plants, as increased membrane fluidity allows other FtsH isomers to compensate for the lack of FtsH2, indicating that membrane fluidity significantly affects the function of the FtsH complex under various stress conditions.
Two H3K23 histone methyltransferases, SET-32 and SET-21, function synergistically to promote nuclear RNAi-mediated transgenerational epigenetic inheritance in Caenorhabditis elegans.
Genetics
December 2024
Department of Molecular Biology and Biochemistry, Rutgers The State University of New Jersey, 604 Allison Road, Piscataway, NJ 08854, USA.
Nuclear RNAi in C. elegans induces a set of transgenerationally heritable marks of H3K9me3, H3K23me3, and H3K27me3 at the target genes. The function of H3K23me3 in the nuclear RNAi pathway is largely unknown due to the limited knowledge of H3K23 histone methyltransferase (HMT).
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