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Peptidoglycan Synthesis01:28

Peptidoglycan Synthesis

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Structure of PeptidoglycanPeptidoglycan is a vital structural component of the bacterial cell wall, providing mechanical strength and shape to the cell. It consists of repeating units of two sugars—N-acetylglucosamine (NAG) and N-acetylmuramic acid (NAM)—linked by β-1,4 glycosidic bonds. These sugar chains are cross-linked by short peptide chains, forming a mesh-like polymer that surrounds the bacterial plasma membrane.Cytoplasmic Phase – Precursor SynthesisPeptidoglycan...
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Quorum sensing is a mechanism of bacterial communication that enables coordinated gene expression in response to changes in population density. This facilitates collective behaviors that enhance survival, resource acquisition, and ecological adaptation. This process relies on small signaling molecules called autoinducers that accumulate as bacterial populations grow. When a critical threshold concentration of autoinducers is reached, bacterial cells collectively modify gene expression,...
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The human immune system is a complex network of cells, tissues, and organs that work together to defend the body against bacterial infections. It consists of various immune cells, each playing a specific role in the defense mechanism.
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The glycocalyx is a carbohydrate-rich, fuzzy-appearing layer on the outer surface of the cell membrane. It is highly hydrophilic, because of this it attracts large amounts of water to the cell's surface. This aids the cell's interaction with the watery environment and also helps it to obtain substances dissolved in the water. It is also important for cell identification, self/non-self determination, and embryonic development and is used in cell-to-cell attachments to form tissues.
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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,...
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Bacterial signaling can occur within bacteria (intracellular) or between bacteria (intercellular). At times, a group of bacteria behaves like a community. To achieve this, they engage in quorum sensing, the perception of higher cell density that causes changes in gene expression. Quorum sensing involves both extracellular and intracellular signaling. The signaling cascade starts with a molecule called an autoinducer (AI). Individual bacteria produce AIs that move out of the bacterial cell...
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Related Experiment Video

Updated: Oct 28, 2025

Generation of Null Mutants to Elucidate the Role of Bacterial Glycosyltransferases in Bacterial Motility
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Glycan-mediated molecular interactions in bacterial pathogenesis.

Sohyoung Lee1, Sean Inzerillo1, Gi Young Lee1

  • 1Department of Microbiology & Immunology, Cornell University, Ithaca, New York 14853, NY, USA.

Trends in Microbiology
|July 18, 2021
PubMed
Summary

Glycans mediate crucial interactions between bacteria and hosts, impacting disease and immunity. Understanding these interactions offers new strategies against drug-resistant pathogens.

Keywords:
anti-bacterial strategiesbacterial pathogensglycansglycobiology of host-pathogen interactionshost responsestechnological advances in glycoscience

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Biomimetic Materials to Characterize Bacteria-host Interactions
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Area of Science:

  • Microbiology
  • Immunology
  • Glycoscience

Background:

  • Glycans on host and bacterial cells are key players in host-pathogen interactions.
  • These interactions can influence pathogenesis, colonization, immune evasion, and host defense mechanisms.

Purpose of the Study:

  • To review the roles of bacterial and host glycans in pathogenesis and immune responses.
  • To explore challenges and opportunities for developing novel antibacterial strategies.
  • To highlight technological advancements in glycoscience.

Main Methods:

  • Literature review and synthesis of current research on glycan-mediated host-pathogen interactions.
  • Analysis of bacterial and host glycan functions in infection and immunity.
  • Discussion of emerging antibacterial strategies and enabling technologies.

Main Results:

  • Bacterial glycans are critical for colonization and immune evasion.
  • Bacteria exploit host glycans for pathogenesis.
  • Both bacterial and host glycans are involved in immune responses against pathogens.
  • Technological advances in glycoscience accelerate research in this field.

Conclusions:

  • Glycan-mediated interactions offer promising targets for new antibacterial therapies.
  • Effective strategies are needed to combat globally spreading drug-resistant pathogens.
  • Continued research and technological innovation in glycoscience are vital for advancing antibacterial strategies.