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Protein Folding: Page 1
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<p class="pagetitle"><strong>Protein Folding:</strong> Form and Function</p>
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<td><p class="mainidea">A protein folds into a shape that enables it perform a specific task.</p></td>
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<p>
Proteins are strings of amino acids, small molecules joined together by
strong covalent bonds. Their shapes are determined almost entirely by
the sequence of amino acids. This is because amino acids have their own
characteristics of charge and relationship to water. Some are strongly
attracted to others and to the polar water molecules; others repel water
and charges.
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<p>
Proteins fold into complex shapes so they can perform a wide variety of
critical tasks in the cell. For example, they work both as movable
"tracks" and the "trucks" that run on them. Specific proteins have
unique shapes so they can:
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swivel to sense a signal
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work as quality control engineers as they roam up and down DNA strands
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<li>
act as match-making enzymes, and much more.
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<p class="mainidea">
A few proteins actually have shapes that suggest what their function is.
Try your hand at matching the proteins shown below with their functions:
</p>
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A protein that can puncture a cell wall:
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protein 1
protein 2
protein 3
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A protein that forms a cable:
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protein 1
protein 2
protein 3
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A protein that becomes a pore in a membrane:
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protein 1
protein 2
protein 3
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