Related Experiment Video
Updated: Jan 9, 2026

Structural Biology and Analytical Chemistry Approaches for Characterizing C-Glycoside Metabolic Enzymes in Human Gut Microbiota
Published on: May 23, 2025
Free GPIs and Comparison of GPI Structures Among Species
Stella Amarachi Ihim1, Morihisa Fujita1
1Institute for Glyco-core Research (iGCORE), Gifu University, Gifu 501-1193, Japan.
Free glycosylphosphatidylinositols (GPIs) are crucial in protozoa and mammals, impacting virulence and disease. These non-protein-linked GPIs are emerging as vital biomarkers and therapeutic targets in glycobiology.
Area of Science:
- Glycobiology
- Molecular Biology
- Parasitology
Background:
- Glycosylphosphatidylinositols (GPIs) anchor eukaryotic proteins to membranes (GPI-APs).
- Non-protein-linked free GPIs are found in protozoa and mammals.
- Free GPIs have roles in virulence, immune modulation, and disease.
Purpose of the Study:
- Compare free GPI and GPI-AP structure and biosynthesis across species.
- Highlight unique adaptations in free GPIs.
- Discuss emerging roles of free GPIs in physiology and pathology.
Main Methods:
- Comparative analysis of literature on free GPIs and GPI-APs.
- Review of studies on protozoan parasites and mammalian cells.
- Exploration of known physiological and pathological conditions.
Main Results:
- Free GPIs exhibit diverse structures and biosynthetic pathways.
- Protozoan free GPIs are implicated in virulence and survival.
- Mammalian free GPIs are linked to specific genetic disorders and blood group phenotypes.
Conclusions:
- Free GPIs are significant molecules with diverse functions.
- Free GPIs represent potential biomarkers and therapeutic targets.
- Further research on free GPIs offers insights into host-pathogen interactions and glycobiology.
More Related Videos
Related Concept Videos
GPI Anchoring of Proteins in the ER Membrane
GPI-anchor structure
A sequence of 11 enzymatic reactions results in the synthesis of the complete GPI anchor consisting of a hydrophobic and a hydrophilic portion. The hydrophobic portion comprises phosphatidylinositol, while the hydrophilic part comprises polar groups like phosphoethanolamine,...
Evolutionary Relationships through Genome Comparisons
Gene Families
Occasionally these regions can be adapted to take on new roles within the organism, becoming novel genes...
Globular and Fibrous Proteins
Globular proteins are also known as spheroproteins and typically are approximately round in shape. They contain a mix of amino acid types and contain differing sequences in their primary structures. Globular proteins have many different functions, such as enzymes, cellular messengers, and molecular transporters. These roles often require the proteins to be...
G Protein-coupled Receptors
GPCRs are also called heptahelical, 7TM, or serpentine receptors, and consist of seven (H1-H7) transmembrane alpha-helices that span the bilayer to form a cylindrical core. The transmembrane helices are connected by three extracellular loops and three...
Activation and Inactivation of G Proteins

