collagen.html

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<!-- Page Title: Collagen -->
<h2>Introduction</h2>
<p>
    This script shows the structure of collagen. (Based on
    1cag.pdb, Bella et al. (1994) Science <strong>266
    </strong>: 75-81)
</p>
<br>

<h2>Triple Helix</h2>
<p>
    A classic collagen triple helix is shown here. The three helices are
	<span style="color:red;">red</span>, <span style="color:gold;">yellow</span>
    and <span style="color:green;">green</span>.
</p>
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<br>

<h2>Helix Stability</h2>
<p>
    A special amino acid sequence makes the tight collagen triple helix
    particularly stable. Every third amino acid is a glycine
    (<span style="color:gold;">YELLOW</span>), and many of the remaining amino
    acids are <span style="color:green;">proline</span> or
    <span style="color:red;">hydroxyproline</span>.
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<h2>Collagen 3</h2>
<p>
    Notice how the glycine (<span style="color:gold;">YELLOW</span>) forms a
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    proline</span> and <span style="color:red;">hydroxyproline</span> smoothly
    bend the chain back around the helix.
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