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Related Concept Videos

Gram-negative Bacterial Protein Secretion Systems01:17

Gram-negative Bacterial Protein Secretion Systems

Gram-negative bacteria utilize sophisticated protein secretion systems to transport proteins across their double-membrane envelope into the extracellular environment or host cells. Based on their mechanism of action, these systems are classified into one-step and two-step pathways.One-Step Secretion Systems (Types I, III, IV, and VI)One-step secretion systems bypass the periplasm entirely, forming a continuous channel that spans both the inner and outer membranes:Type I Secretion System (T1SS):...
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...
Bacterial Translocation and Protein Secretion01:26

Bacterial Translocation and Protein Secretion

Bacterial protein secretion involves translocation systems to ensure proteins reach their designated locations, including the plasma membrane, periplasm, outer membrane, or the external environment. These translocation systems are vital for bacterial physiology, supporting processes like membrane assembly, enzymatic activity in the periplasm, and interactions with the external environment. The division of labor between Sec and Tat pathways ensures efficiency in handling proteins with diverse...
Outer Layers of the Cell Envelope01:18

Outer Layers of the Cell Envelope

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...
ABC Transporters: Importer01:27

ABC Transporters: Importer

ATP-binding cassette or ABC transporters are a class of ATP-driven pumps that hydrolyze ATP to move solutes across the membrane. They can be grouped into importers and exporters. While exporters are present in all domains of life, importers exist only in bacteria and some plants.
In bacteria, based on the number of transmembrane helices and the chemical nature of their substrates, the ABC importers can be divided into three types:
Oligosaccharide Assembly01:24

Oligosaccharide Assembly

Protein glycosylation starts in the ER lumen and continues in the Golgi apparatus. Glycosyltransferases catalyze the addition of sugar molecules or glycosylation of proteins. Usually, these enzymes add sugars to the hydroxyl groups of selected serine or threonine residues to form O-linked glycans or the amino groups of asparagine residues to form N-linked glycans. Different positions on the same polypeptide chain can contain differently linked glycans.
Multiple sugar molecules that may or may...

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Related Experiment Video

Updated: May 12, 2026

Separation of the Cell Envelope for Gram-negative Bacteria into Inner and Outer Membrane Fractions with Technical Adjustments for Acinetobacter baumannii
10:24

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

Polysaccharide export outer membrane proteins in Gram-negative bacteria.

Biao Yuan1, Anchun Cheng, Mingshu Wang

  • 1Institute of Preventive Veterinary Medicine, Sichuan Agricultural University, Wenjiang, Chengdu City, Sichuan 611130, China.

Future Microbiology
|March 29, 2013
PubMed
Summary

Gram-negative bacteria use outer membrane proteins for polysaccharide export. This review details assembly mechanisms for E. coli polysaccharides and protein interactions, highlighting potential antibiotic targets.

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Last Updated: May 12, 2026

Separation of the Cell Envelope for Gram-negative Bacteria into Inner and Outer Membrane Fractions with Technical Adjustments for Acinetobacter baumannii
10:24

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Published on: April 10, 2020

From Constructs to Crystals – Towards Structure Determination of β-barrel Outer Membrane Proteins
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From Constructs to Crystals – Towards Structure Determination of β-barrel Outer Membrane Proteins

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Looking Outwards: Isolation of Cyanobacterial Released Carbohydrate Polymers and Proteins
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Looking Outwards: Isolation of Cyanobacterial Released Carbohydrate Polymers and Proteins

Published on: May 27, 2019

Area of Science:

  • Microbiology
  • Molecular Biology
  • Biochemistry

Background:

  • Polysaccharide export across the outer membrane of Gram-negative bacteria is crucial for cell function but not fully understood.
  • Escherichia coli serves as a model organism for studying polysaccharide assembly mechanisms.
  • Outer membrane proteins play a key role in the translocation of polysaccharides.

Purpose of the Study:

  • To review the current understanding of polysaccharide assembly mechanisms in Escherichia coli.
  • To summarize the structures and interactions of key outer membrane proteins involved in polysaccharide export.
  • To explore potential therapeutic targets, such as LptD, for antibiotic development.

Main Methods:

  • Literature review of existing research on polysaccharide export in Gram-negative bacteria.
  • Analysis of structural and interaction data for outer membrane proteins.
  • Discussion of established and emerging knowledge on polysaccharide assembly pathways.

Main Results:

  • Detailed review of assembly mechanisms for group 1 capsular polysaccharide, group 2 capsular polysaccharide, and lipopolysaccharide in E. coli.
  • Summary of structural insights and protein-protein interactions for essential export machinery.
  • Identification of LptD as a potential target for peptidomimetic antibiotics.

Conclusions:

  • Significant progress has been made in understanding E. coli polysaccharide assembly, yet gaps remain.
  • Outer membrane protein structures and interactions are critical for efficient polysaccharide export.
  • Targeting components like LptD offers a promising avenue for novel antibiotic strategies against Gram-negative pathogens.