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Non-conventional toxins from Elapid venoms
S Nirthanan1, P Gopalakrishnakone, M C E Gwee
1Venom and Toxin Research Programme, Department of Anatomy, Faculty of Medicine, National University of Singapore, Singapore.
Summary
Non-conventional toxins from snake venom, though less potent, exhibit unique structural features and diverse targets, including neuronal receptors. Further research may reveal novel therapeutic applications.
Area of Science:
- * Biochemistry and Toxicology: Focus on snake venom components and their biological effects.
Background:
- * Non-conventional toxins are a distinct group of three-finger toxins found in Elapidae venoms.
- * They possess a unique disulfide bridge arrangement in loop I, differing from other three-finger toxins.
- * These toxins exhibit lower toxicity (LD50 5-80 mg/kg) compared to alpha-neurotoxins.
Purpose of the Study:
- * To characterize the structural and functional properties of non-conventional toxins.
- * To investigate their molecular targets and potential biological activities.
- * To explore their potential as pharmacological tools.
Main Methods:
- * Analysis of amino acid sequences and structural studies of non-conventional toxins.
- * Comparison with other known three-finger toxins (e.g., alpha-neurotoxins).
- * Review of existing literature on toxicity and receptor interactions.
Main Results:
- * Non-conventional toxins share structural similarities but have distinct disulfide bridge locations.
- * They exhibit lower toxicity and bind to muscle nicotinic acetylcholine receptors with lower affinity.
- * Emerging evidence shows antagonism of neuronal alpha 7 nicotinic acetylcholine receptors.
Conclusions:
- * Non-conventional toxins are functionally diverse, not solely targeting muscle receptors.
- * Their unique properties suggest potential for novel ligand development.
- * Further investigation into their molecular targets could unlock new therapeutic avenues.