Related Experiment Video
Updated: Jun 17, 2026
08:08
Automated Measurement of Cryptococcal Species Polysaccharide Capsule and Cell Body
Published on: January 11, 2018
Galactoxylomannans from Cryptococcus neoformans varieties neoformans and grubii are structurally and antigenically
Magdia De Jesus1, Siu-Kei Chow, Radames J B Cordero
1Department of Microbiology and Immunology, Albert Einstein College of Medicine, 1300 Morris Park Ave., Bronx, NY 10461, USA.
Eukaryotic Cell
|January 12, 2010
Summary
Galactoxylomannan (GalXM) from Cryptococcus neoformans shows structural and antigenic variations between serotypes A and D. These differences, influenced by growth conditions, may affect immune responses.
Area of Science:
- Mycology
- Immunology
- Biochemistry
Background:
- Cryptococcus neoformans galactoxylomannan (GalXM) exhibits serotype-specific structural and antigenic variations.
- These variations are known to influence the molecule's immunomodulatory effects.
Purpose of the Study:
- To characterize the structural and physicochemical properties of GalXM from C. neoformans serotypes A and D.
- To investigate the impact of environmental conditions on GalXM structure.
- To assess the antigenic relatedness of GalXM across different Cryptococcus species and varieties.
Main Methods:
- Carbohydrate analysis
- Static and dynamic light scattering (including multiangle laser light scattering)
- Zeta potential measurements
- Antigenic analysis using polyclonal antibodies
Main Results:
- GalXM from serotype A (strain cap59) exhibited significantly higher molecular mass and radius of gyration compared to serotype D (strain cap67).
- GalXM structure (effective diameter, polydispersity) varied with temperature and growth medium, indicating environmental influence.
- Zeta potential was negative for both strains, consistent with glucuronic acid presence.
- Antigenic analysis revealed similarities among C. neoformans varieties but no reactivity with C. gattii.
Conclusions:
- C. neoformans GalXM displays significant structural and antigenic variability dependent on serotype and environmental conditions.
- These variations may lead to differential immunomodulatory effects, impacting host immune responses.
- GalXM structure and antigenicity are key factors in understanding Cryptococcus pathogenesis and host interactions.
Related Concept Videos
01:27Cryptococcal 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,...
01:15Antifungal 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...
01:57Protein Complexes with Interchangeable Parts
Groups of proteins may form a complex where each protein in this complex has a different role in the overall execution of the complex’s function. Often some of the proteins in the complex can be replaced by a closely related variant to give a complex that contains many of the same components yet is functionally distinct.
The SCF ubiquitin ligase is a protein complex of five individual proteins. This complex attaches ubiquitin to other target proteins to mark them for degradation. In order to...
The SCF ubiquitin ligase is a protein complex of five individual proteins. This complex attaches ubiquitin to other target proteins to mark them for degradation. In order to...
01:24Oligosaccharide 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...
Multiple sugar molecules that may or may...