Related Experiment Video
Updated: Jul 5, 2026
11:44
Synthesis and Structure Determination of µ-Conotoxin PIIIA Isomers with Different Disulfide Connectivities
Published on: October 2, 2018
mr1e, a conotoxin from Conus marmoreus with a novel disulfide pattern
Yanfang Wang1, Xiaoxia Shao, Min Li
1Institute of Protein Research, Tongji University, Shanghai 200092, China.
Acta Biochimica Et Biophysica Sinica
|May 10, 2008
Summary
Researchers discovered a new conotoxin, mr1e, from Conus marmoreus. This novel peptide exhibits an excitatory effect in mice and represents a new conotoxin family.
Area of Science:
- Marine biology
- Biochemistry
- Neuroscience
Background:
- Conotoxins are peptides from cone snails known for diverse structures and functions.
- Understanding conotoxin diversity is crucial for discovering new bioactive compounds.
Purpose of the Study:
- To identify and characterize a novel conotoxin from Conus marmoreus.
- To determine the structure and disulfide linkage of the new conotoxin.
- To investigate the biological activity of the novel conotoxin.
Main Methods:
- Peptide identification from Conus marmoreus.
- Amino acid sequencing and disulfide bond analysis.
- Reverse-phase High-Performance Liquid Chromatography (RP-HPLC) for isomer separation.
- Intracranial injection in mice to assess physiological effects.
Main Results:
- A novel 11-amino acid conotoxin, designated mr1e, was identified.
- mr1e possesses two disulfide bonds with a specific connectivity (C1-C4, C2-C3), forming a ribbon-like structure.
- The peptide demonstrated an excitatory effect in mouse models.
- Sequence homology analysis indicated mr1e represents a new conotoxin family.
Conclusions:
- mr1e is a novel conotoxin from Conus marmoreus with unique structural features.
- The specific disulfide linkage is critical for its native structure and function.
- This discovery expands the known diversity of conotoxins and offers new avenues for research.
More Related Videos
Related Concept Videos
01:12Bacterial Toxins
Bacterial toxins are sophisticated virulence factors that enable pathogenic bacteria to interact with, invade, and damage host tissues. These toxins fall broadly into two types: protein exotoxins, which are secreted into the environment and target specific host receptors, and lipopolysaccharide endotoxins, which are structural components of the bacterial outer membrane released primarily during bacterial lysis or membrane shedding. Exotoxins generally act more selectively, binding to cell...
01:29Tetanus
Tetanus is a life-threatening neurological disorder characterized by persistent muscle contractions and spastic paralysis. It is caused by Clostridium tetani, a motile, Gram-positive, rod-shaped, obligate anaerobe. These bacteria produce terminal endospores, giving them a distinctive “lollipop” or “tennis-racket” appearance. They thrive in anaerobic environments, such as those found in deep puncture wounds.Once introduced into the body, the spores germinate into vegetative cells. These cells...