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<p><b>New page</b></p><div>[[File:Notexin.png|thumb|Notexin]] '''Notexin''' is a [[toxin]] derived from the venom of the [[Australian tiger snake]] (''Notechis scutatus''). It is a potent [[myotoxin]] that specifically targets [[skeletal muscle]] cells, leading to [[muscle necrosis]] and [[paralysis]]. Notexin is often used in [[biomedical research]] to study muscle regeneration and the mechanisms of muscle damage.<br />
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==Structure and Function==<br />
Notexin is a [[phospholipase A2]] (PLA2) enzyme, which means it hydrolyzes the [[phospholipids]] in cell membranes. This enzymatic activity disrupts the integrity of the muscle cell membranes, causing cell lysis and subsequent muscle damage. The primary structure of notexin consists of a single polypeptide chain with a molecular weight of approximately 14 kDa.<br />
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==Mechanism of Action==<br />
Upon injection into muscle tissue, notexin binds to the [[phospholipid bilayer]] of muscle cell membranes. Its PLA2 activity then catalyzes the hydrolysis of [[phosphatidylcholine]] and other phospholipids, leading to the release of [[arachidonic acid]] and [[lysophospholipids]]. These products are highly reactive and contribute to the breakdown of the cell membrane, resulting in muscle cell death.<br />
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==Applications in Research==<br />
Notexin is widely used in [[muscle biology]] research due to its ability to induce controlled muscle damage. Researchers use notexin to create models of muscle injury in [[laboratory animals]], which helps in studying the processes of muscle degeneration and regeneration. This research is crucial for understanding diseases such as [[muscular dystrophy]] and for developing potential therapies.<br />
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==Safety and Handling==<br />
As a potent toxin, notexin must be handled with extreme care in a controlled laboratory environment. Proper [[personal protective equipment]] (PPE) such as gloves and safety goggles should be worn, and protocols for handling and disposal must be strictly followed to prevent accidental exposure.<br />
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==Related Pages==<br />
* [[Australian tiger snake]]<br />
* [[Phospholipase A2]]<br />
* [[Myotoxin]]<br />
* [[Muscle necrosis]]<br />
* [[Muscular dystrophy]]<br />
* [[Arachidonic acid]]<br />
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==See Also==<br />
* [[Snake venom]]<br />
* [[Toxin]]<br />
* [[Muscle regeneration]]<br />
* [[Cell membrane]]<br />
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{{Reflist}}<br />
{{Venomous snakes}}<br />
{{medicine-stub}}<br />
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[[Category:Toxins]]<br />
[[Category:Snake toxins]]<br />
[[Category:Phospholipase A2 enzymes]]<br />
[[Category:Myotoxins]]<br />
[[Category:Biomedical research]]</div>Prab