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Related Concept Videos

Formation of Lipopolysaccharides01:19

Formation of Lipopolysaccharides

Lipopolysaccharides (LPS) are crucial components of the outer membrane of Gram-negative bacteria, serving both structural and functional roles. It contributes to membrane stability and protects bacteria from host immune responses. LPS is composed of three major regions—lipid A, a core oligosaccharide, and an O antigen. The biosynthesis and assembly of LPS involve a highly coordinated set of enzymatic reactions and transport mechanisms. Additionally, LPS is recognized as an endotoxin, triggering...
The Inner Mitochondrial Membrane01:28

The Inner Mitochondrial Membrane

The inner mitochondrial membrane is the primary site of ATP synthesis. The inner membrane domain that forms a smooth layer adjacent to the outer membrane is called the inner boundary membrane. This domain contains membrane transporters that drive metabolites in and out of the mitochondria.  In contrast, the inner membrane network that invaginates into the matrix space is called the cristae membrane. This domain accounts for principle mitochondrial function as it accommodates the protein...
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Mitochondria, chloroplasts, and gram-negative bacteria have transmembrane, beta-barrel proteins called porins to mediate the free diffusion of ions and metabolites across the membrane. Mitochondrial porin precursors contain conserved amino acid sequences called beta signals at their C-terminal. Beta signals have a  motif of PoXGXXHyXHy (Po-Polar, X-Any amino acid, G-Glycine, Hy-LargeHydrophobic), which are crucial for precursor recognition to initiate precursor assembly. Beta-barrel precursors...
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The outermost layers of prokaryotic cells play a critical role in their survival, virulence, and interaction with the environment. These layers, often composed of polysaccharides, polypeptides, or proteins, form protective and adhesive structures that vary in organization and function.Capsules and Slime LayersCapsules are highly organized, tightly bound layers that firmly attach to the bacterial cell wall. Capsules are usually made of polysaccharides, though some are made of polypeptides. These...
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A single mitochondrion is a bean-shaped organelle enclosed by a double-membrane system. The outer membrane of mitochondria is smooth and contains many porins - the integral membrane transporters. Porins enable free diffusion of ions and small uncharged molecules through the outer mitochondrial membrane but limit the transport of molecules larger than 5000 Daltons. Further, the outer mitochondrial membrane forms a unique structure called membrane contact sites with other subcellular organelles,...
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A single mitochondrion is a bean-shaped organelle enclosed by a double-membrane system. The outer membrane of mitochondria is smooth and contains many porins - the integral membrane transporters. Porins enable free diffusion of ions and small uncharged molecules through the outer mitochondrial membrane but limit the transport of molecules larger than 5000 Daltons. Further, the outer mitochondrial membrane forms a unique structure called membrane contact sites with other subcellular organelles,...

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Related Experiment Video

Updated: Jul 10, 2026

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

Published on: April 10, 2020

Structure and function of Salmonella inner membrane.

Xinliang Liu1, Yun Wang1, Jinxin Sun1

  • 1College of Basic Medicine and Forensic Medicine, Henan University of Science and Technology, Luoyang, 471023, China.

Archives of Microbiology
|July 9, 2026
PubMed
Summary
This summary is machine-generated.

The Salmonella inner membrane is a dynamic network, not just a barrier. It coordinates transport, metabolism, and protein export to help bacteria adapt to host stress and infection.

Keywords:
SalmonellaEnvelope homeostasisHost adaptationInner membraneMembrane proteinsPhospholipidsTransportersVirulence

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Area of Science:

  • Microbiology
  • Bacterial Physiology
  • Molecular Biology

Background:

  • The Salmonella inner membrane functions beyond selective permeability, integrating diverse cellular processes.
  • Understanding these integrated functions is crucial for deciphering bacterial adaptation and virulence.

Purpose of the Study:

  • To review the Salmonella inner membrane as a coordinated adaptive network.
  • To highlight how inner membrane components interact under infection-related stress.

Main Methods:

  • Review of literature focusing on Salmonella inner membrane proteins and their functions.
  • Analysis of representative transporters, respiratory enzymes, secretion systems, and phospholipids.
  • Integration of data on protein secretion (Sec/Tat, T3SSs), nutrient uptake (ABC importers, secondary transporters), energy metabolism (respiratory complexes, F₀F₁-ATPase), and envelope biogenesis.

Main Results:

  • Inner membrane proteins function as interconnected modules rather than isolated units.
  • Transport systems facilitate nutrient acquisition and resistance to host-imposed challenges (antibiotics, bile, AMPs).
  • Energy metabolism and envelope pathways are intrinsically linked to stress tolerance, virulence, and host adaptation.

Conclusions:

  • The Salmonella inner membrane acts as a coordinated adaptive network, crucial for bacterial survival and pathogenesis.
  • Targeting this network offers potential for novel antibacterial strategies that disrupt bacterial adaptation.