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Two new enzymes that liberate undecaprenyl-phosphate to replenish the carrier lipid pool during envelope stress.
mBio
January 2025
Department of Microbiology, Harvard Medical School, Boston, Massachusetts, USA.
The 55-carbon isoprenoid, undecaprenyl-phosphate (UndP), is a universal carrier lipid that ferries most glycans and glycopolymers across the cytoplasmic membrane in bacteria. In addition to peptidoglycan precursors, UndP transports O-antigen, capsule, wall teichoic acids, and sugar modifications. How this shared but limited lipid is distributed among competing pathways is just beginning to be elucidated.
View Article and Find Full Text PDFStructural and Functional Characterization of Conserved Key Amino Acids in Lipoteichoic Acid Synthase LtaS of .
J Agric Food Chem
January 2025
Key Lab of Clean Energy and Green Circulation, College of Chemistry and Material Science, Huaibei Normal University, Huaibei 235000, China.
Lipoteichoic acid synthase (LtaS) is crucial for the biosynthesis of lipoteichoic acid (LTA) in lactic acid bacteria (LAB), where LTA plays a key role in bacterial adhesion, immune modulation, and maintaining cell integrity. This study explores the regulation of LtaS activity in , examining the effects of factors such as temperature, pH, and metal ions on enzyme activity. Molecular docking was used to identify critical amino acids at the enzyme's active site, and site-directed mutagenesis confirmed the role of five key residues (Glu-259, Thr-303, Asn-353, Arg-360, and His-420) in LtaS activity.
View Article and Find Full Text PDFPostbiotic studies of mixed cultures of and B-5P produced b rumen producing short-chain fatty acid.
Vet World
November 2024
Research Organization of Agriculture and Food, National Research and Innovation Agency, Bogor, 16911, Indonesia.
Background And Aim: Postbiotics are functional bioactive compounds or bioactive molecules with beneficial effects on health and functional activities in humans or livestock, produced by probiotic bacteria or yeast. Several postbiotics, including enzymes, short-chain fatty acids, amino acids, extracellular polysaccharides, microbial cell fragments, and teichoic acids, are currently being widely studied. This study aimed to explore the potential of secondary metabolites of and as lactic acid bacteria (LAB) and yeast isolated from Budu (fermented fish) which can act as postbiotics through rumen fermentation.
View Article and Find Full Text PDFChemical structure of lipoteichoic acid in the probiotic strain Latilactobacillus curvatus CP2998.
FEMS Microbiol Lett
January 2025
Department of Microbiology, Sapporo Medical University School of Medicine, Sapporo, Hokkaido 060-8556, Japan.
Latilactobacillus curvatus, found in various fermented foods, is a promising probiotic with unique health benefits. Lipoteichoic acid (LTA) is a characteristic amphiphilic surface polymer of Gram-positive bacteria and exhibits immunomodulatory activities. Despite the structural diversity of LTA among different bacterial species and strains, no information is available on the chemical structure of LTA in L.
View Article and Find Full Text PDFPTGS2/GRP78 Activation Triggers Endoplasmic Reticulum Stress Leading to Lipid Metabolism Disruption and Cell Apoptosis, Exacerbating Damage in Bovine Mastitis.
Biomolecules
November 2024
College of Veterinary Medicine, Gansu Agricultural University, Lanzhou 730070, China.
Lipoteichoic acid (LTA), an organic acid of Gram-positive bacteria, is closely related to mastitis in dairy cows. This study evaluates the effect of LTA-induced endoplasmic reticulum stress (ER stress) in vitro using MAC-T (mammary epithelial cells) and in dairy cows with mastitis. LTA stimulation significantly increases ER stress and apoptosis-related factors in MAC-T.
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