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cysteine.html
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cysteine.html
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<!DOCTYPE html>
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<div class="card-header"> Cysteine </div>
<div class="card-body">
<h5 class="card-title"> <i class="fa fa-info-circle" aria-hidden="true" title="information about amino-acid"></i>
</h5>
<p class="card-text">
<a-scene>
<a-assets>
<a-asset-item id="Cysteine_Dioxygenase" src="/models/2IC1.glb"></a-asset-item>
</a-assets>
<a-entity gltf-model="#Cysteine_Dioxygenase" animation-mixer position="10 22 -90"></a-entity>
</a-scene>
<table>
<tr>
<th> Group, </th>
<th> Alien-Protein-code, </th>
<th> Agent, </th>
<th> Formula, </th>
</tr>
<tr>
<td> </td>
<td> </td>
<td> Neutral, </td>
<td>
<a class="jmol" href="https://chemapps.stolaf.edu/jmol/jmol.php?model=C%28%5BC%40%40H%5D%28C%28%3DO%29%5BO-%5D%29%5BNH3%2B%5D%29S" title="Chemical structure of Cysteine molecule. In Cysteine compound Hydrogen atoms are abudant.">
C<small class="subscript">3-</small>H<small class="subscript">7-</small>NO<small class="subscript">2-</small>S
</a>
</td>
</tr>
<tr>
<th> Weight, </th>
<th> Nature, </th>
<th> Role, </th>
<th> Sidechain, </th>
</tr>
<tr>
<td>
121.15 g·mol−1,
</td>
<td>
Hydrophile,
</td>
<td>
<li> Precursor to the antioxidant glutathione. </li>
<li> Precursor to iron-sulfur clusters. </li>
<li> Metal ion binding. </li>
<li> Roles in protein structure. </li>
Free cysteine residues do occur in proteins, most are covalently bonded to other cysteine residues to form disulfide bonds, which play an important role in the folding and stability of some proteins, usually proteins secreted to the extracellular medium.
Protein disulfide isomerases catalyze the proper formation of disulfide bonds; the cell transfers dehydroascorbic acid to the endoplasmic reticulum, which oxidizes the environment. In this environment, cysteines are, in general, oxidized to cystine and are no longer functional as a nucleophiles.
Aside from its oxidation to cystine, cysteine participates in numerous post-translational modifications.
The nucleophilic sulfhydryl group allows cysteine to conjugate to other groups, e.g., in prenylation. Ubiquitin ligases transfer ubiquitin to its pendant, proteins, and caspases, which engage in proteolysis in the apoptotic cycle.
Inteins often function with the help of a catalytic cysteine.
These roles are typically limited to the intracellular milieu, where the environment is reducing, and cysteine is not oxidized to cystine.
</td>
<td>
Thiol ,
</td>
</tr>
</table>
</p>
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