Collagen: Difference between revisions
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<applet load='1cag' size='300' frame='true' align='right' caption='Collagen' /> | <applet load='1cag' size='300' frame='true' align='right' caption='Collagen' /> | ||
[[Image:1cag.png |left]] | [[Image:1cag.png |left |thumb]] | ||
About one quarter of all of the protein in your body is collagen. Collagen is a major structural protein, forming molecular cables that strengthen the tendons and vast, resilient sheets that support the skin and internal organs. Collagen provides structure to our bodies, protecting and supporting the softer tissues and connecting them with the skeleton. But, in spite of its critical function in the body, collagen is a relatively simple protein. | About one quarter of all of the protein in your body is collagen. Collagen is a major structural protein, forming molecular cables that strengthen the tendons and vast, resilient sheets that support the skin and internal organs. Collagen provides structure to our bodies, protecting and supporting the softer tissues and connecting them with the skeleton. But, in spite of its critical function in the body, collagen is a relatively simple protein. | ||
== The Collagen Triple Helix == | == The Collagen Triple Helix == | ||
[[Image:MotM Collagen.gif|right |thumb]] | |||
Collagen is composed of three chains, wound together in a tight triple helix. The illustration included here shows only a small segment of the entire molecule--each chain is over 1400 amino acids long and only about 20 are shown here. A repeated sequence of three amino acids forms this sturdy structure. Every third amino acid is glycine, a small amino acid that fits perfectly inside the helix. Many of the remaining positions in the chain are filled by two unexpected amino acids: proline and a modified version of proline, hydroxyproline. We wouldn't expect proline to be this common, because it forms a kink in the polypeptide chain that is difficult to accommodate in typical globular proteins. But, as you can see on the next page, it seems to be just the right shape for this structural protein. | Collagen is composed of three chains, wound together in a tight triple helix. The illustration included here shows only a small segment of the entire molecule--each chain is over 1400 amino acids long and only about 20 are shown here. A repeated sequence of three amino acids forms this sturdy structure. Every third amino acid is glycine, a small amino acid that fits perfectly inside the helix. Many of the remaining positions in the chain are filled by two unexpected amino acids: proline and a modified version of proline, hydroxyproline. We wouldn't expect proline to be this common, because it forms a kink in the polypeptide chain that is difficult to accommodate in typical globular proteins. But, as you can see on the next page, it seems to be just the right shape for this structural protein. | ||
