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            <title xml:lang="en">Unraveling double stranded ?-helical coiled coils: An x-ray diffraction study on hard ?-keratin fibers</title>
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                <forename type="first">L.</forename>
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            <idno type="halRefHtml">&lt;i&gt;Biopolymers&lt;/i&gt;, 2001, 58 (5), pp.526-533. &lt;a target="_blank" href="https://dx.doi.org/10.1002/1097-0282(20010415)58:5&lt;526::AID-BIP1028&gt;3.0.CO;2-L"&gt;&amp;#x27E8;10.1002/1097-0282(20010415)58:5&lt;526::AID-BIP1028&gt;3.0.CO;2-L&amp;#x27E9;&lt;/a&gt;</idno>
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                <title level="j">Biopolymers</title>
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              <classCode scheme="mesh">Animals</classCode>
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              <classCode scheme="mesh">Horses</classCode>
              <classCode scheme="mesh">Keratins</classCode>
              <classCode scheme="mesh">Protein Conformation</classCode>
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              <p>Transformations of proteins secondary and tertiary structures are generally studied in globular proteins in solution. In fibrous proteins, such as hard alpha-keratin, that contain long and well-defined double stranded alpha-helical coiled coil domains, such study can be directly done on the native fibrous tissue. In order to assess the structural behavior of the coiled coil domains under an axial mechanical stress, wide angle x-ray scattering and small angle x-ray scattering experiments have been carried out on stretched horse hair fibers at relative humidity around 30%. Our observations of the three major axial spacings as a function of the applied macroscopic strain have shown two rates. Up to 4% macroscopic strain the coiled coils were slightly distorted but retained their overall conformation. Above 4% the proportion of coiled coil domains progressively decreased. The main and new result of our study is the observation of the transition from alpha-helical coiled coils to disordered chains instead of the alpha-helical coiled coil to beta-sheet transition that occurs in wet fibers.</p>
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