Alpha helix: Difference between revisions
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An <scene name='77/778341/Ballstick/1'>alpha helix</scene> is a type of secondary structure, i.e. a description of how the main chain of a protein is arranged in space. It is a repetitive regular secondary structure (just like the beta strand), i.e. all residues have similar conformation and hydrogen bonding, and it can be of arbitrary length. | An <scene name='77/778341/Ballstick/1'>alpha helix</scene> is a type of secondary structure, i.e. a description of how the main chain of a protein is arranged in space. It is a repetitive regular secondary structure (just like the beta strand), i.e. all residues have similar conformation and hydrogen bonding, and it can be of arbitrary length. | ||
In an alpha helix, the main chain arranges in a <scene name='77/778341/Ribbon/1'>right-handed helix</scene> with the side chains ( | In an alpha helix, the main chain arranges in a <scene name='77/778341/Ribbon/1'>right-handed helix</scene> with the <jmolLink> | ||
<script> select 6-10:A.sidechain; spacefill 20%; delay 0.4; select 6-10:A.CB or 6-10:A.backbone; restrict selected | |||
</script> | |||
<text>side chains</text> | |||
</jmolLink>side chains (truncated at the beta carbon for a better view of the main chain) pointing away from the helical axis. The alpha helix is stabilized by <scene name='77/778341/Hbonds/2'>hydrogen bonds</scene> (shown as dashed lines) from the <jmol> | |||
<jmolLink> | <jmolLink> | ||
<script> select 6-10:A.O; spacefill 30%; delay 0.4; spacefill 20%; delay 0.4; spacefill 30%; delay 0.4; spacefill 20%l delay 0.4; | <script> select 6-10:A.O; spacefill 30%; delay 0.4; spacefill 20%; delay 0.4; spacefill 30%; delay 0.4; spacefill 20%l delay 0.4; | ||