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Related Concept Videos

Cryptococcal Meningitis01:27

Cryptococcal Meningitis

Cryptococcal meningitis is a life-threatening opportunistic infection predominantly associated with HIV/AIDS, accounting for over 100,000 deaths annually worldwide. However, it also affects individuals with other forms of immunosuppression, including those undergoing immunosuppressive therapy, organ transplant recipients, patients with innate immunodeficiencies, and individuals with hematological disorders. The infection is caused mainly by Cryptococcus neoformans and Cryptococcus gattii,...
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Antifungal Agents

Amphotericin B is a broad-spectrum antifungal agent that exploits structural differences between fungal and mammalian cell membranes. Its amphipathic structure—featuring a hydrophobic polyene-lactone ring and a hydrophilic region containing mycosamine and carboxylic acid groups—enables selective binding to ergosterol, a sterol predominantly found in fungal plasma membranes. This selective interaction underlies the drug’s antifungal activity, although weak binding to cholesterol contributes to...
Peptidoglycan Synthesis01:28

Peptidoglycan Synthesis

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 biosynthesis begins in...
Biosynthesis of Polysaccharides01:26

Biosynthesis of Polysaccharides

Polysaccharides such as glycogen and starch are synthesized from nucleoside diphosphate sugars, primarily uridine diphosphate glucose (UDPG) and adenosine diphosphate glucose (ADPG). These activated glucose donors act as key intermediates in carbohydrate metabolism and biosynthesis. UDPG primarily involves glycogen synthesis in animals and many bacteria, while ADPG plays a fundamental role in starch synthesis in plants and certain bacteria.UDPG is formed when glucose-1-phosphate reacts with...
Biosynthesis in Bacteria01:24

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Biosynthesis in bacteria is a fundamental anabolic process that generates essential macromolecules, including proteins, nucleic acids, lipids, and polysaccharides. These macromolecules are critical for cellular growth, replication, and function. The process is tightly regulated and energetically linked to catabolic pathways to ensure optimal resource utilization.Biosynthetic pathways begin with precursor metabolites such as pyruvate, acetyl-CoA, and glucose-6-phosphate derived from glycolysis,...
Glycocalyx and its Functions01:14

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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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Updated: May 29, 2026

Automated Measurement of Cryptococcal Species Polysaccharide Capsule and Cell Body
08:08

Automated Measurement of Cryptococcal Species Polysaccharide Capsule and Cell Body

Published on: January 11, 2018

Emerging themes in cryptococcal capsule synthesis.

Pardeep Kumar1, Meng Yang, Brian C Haynes

  • 1Department of Molecular Microbiology, Washington University Medical School, St. Louis, MO 63110, USA.

Current Opinion in Structural Biology
|September 6, 2011
PubMed
Summary
This summary is machine-generated.

Cryptococcus neoformans yeast synthesizes a large polysaccharide capsule essential for causing disease. Researchers are investigating variations in capsule polymers and the regulation of its biosynthesis.

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Size Matters: Measurement of Capsule Diameter in Cryptococcus neoformans
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Last Updated: May 29, 2026

Automated Measurement of Cryptococcal Species Polysaccharide Capsule and Cell Body
08:08

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Published on: January 11, 2018

Size Matters: Measurement of Capsule Diameter in Cryptococcus neoformans
08:24

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Published on: February 27, 2018

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09:03

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Area of Science:

  • Mycology
  • Pathogenic Microbiology
  • Biochemistry

Background:

  • Cryptococcus neoformans is an opportunistic fungal pathogen.
  • The yeast produces a large polysaccharide capsule crucial for virulence.
  • Capsule synthesis presents a significant biosynthetic challenge.

Purpose of the Study:

  • To review recent advances in Cryptococcus neoformans capsule synthesis.
  • To highlight the variation in capsule polysaccharide composition.
  • To discuss the regulatory mechanisms governing capsule biosynthesis.

Main Methods:

  • Literature review of studies on Cryptococcus neoformans capsule.
  • Analysis of research on capsule polymer diversity.
  • Examination of regulatory pathways controlling capsule production.

Main Results:

  • Significant variation exists in the composition of Cryptococcus neoformans capsule polysaccharides.
  • The biosynthesis of the capsule is tightly regulated.
  • Understanding these processes is key to understanding fungal pathogenesis.

Conclusions:

  • Capsule variation and regulated biosynthesis are critical aspects of Cryptococcus neoformans virulence.
  • Further research into these areas may reveal novel therapeutic targets.
  • The study provides an overview of a rapidly advancing field.