Signaling through the PbgA-LapB regulatory complex activates LpxC proteolysis and limits lipopolysaccharide biogenesis during stationary-phase growth.

serovar Typhimurium (. Typhimurium) controls lipopolysaccharide (LPS) biosynthesis by regulating proteolysis of LpxC, the rate-limiting enzyme and target of preclinical antibiotics. PbgA/YejM/LapC regulates LpxC levels and controls outer membrane (OM) LPS composition at the log-to-stationary phase transition.

Cardiolipin Biosynthesis Genes Are Not Required for Serovar Typhimurium Pathogenesis in C57BL/6J Mice.

Salmonella enterica serovar Typhimurium is an intracellular pathogen that parasitizes macrophages from within a vacuole. The vacuolar environment prompts the bacterium to regulate the lipid composition of the outer membrane (OM), and this influences host inflammation. .

Conserved Tandem Arginines for PbgA/YejM Allow Salmonella Typhimurium To Regulate LpxC and Control Lipopolysaccharide Biogenesis during Infection.

Enterobacteriaceae use the periplasmic domain of the conserved inner membrane protein, PbgA/YejM, to regulate lipopolysaccharide (LPS) biogenesis. Salmonella enterica serovar Typhimurium ( Typhimurium) relies on PbgA to cause systemic disease in mice and this involves functional interactions with LapB/YciM, FtsH, and LpxC. Escherichia coli PbgA interacts with LapB, an adaptor for the FtsH protease, via the transmembrane segments.

Modulating Isoprenoid Biosynthesis Increases Lipooligosaccharides and Restores Acinetobacter baumannii Resistance to Host and Antibiotic Stress.

Acinetobacter baumannii is a leading cause of ventilator-associated pneumonia and a critical threat due to multidrug resistance. The A. baumannii outer membrane is an asymmetric lipid bilayer composed of inner leaflet glycerophospholipids and outer leaflet lipooligosaccharides.

Separation of the Cell Envelope for Gram-negative Bacteria into Inner and Outer Membrane Fractions with Technical Adjustments for Acinetobacter baumannii.

This method works by partitioning the envelope of Gram-negative bacteria into total, inner, and outer membrane (OM) fractions and concludes with assays to assess the purity of the bilayers. The OM has an increased overall density compared to the inner membrane, largely due to the presence of lipooligosaccharides (LOS) and lipopolysaccharides (LPS) within the outer leaflet. LOS and LPS molecules are amphipathic glycolipids that have a similar structure, which consists of a lipid-A disaccharolipid and core-oligosaccharide substituent.