Alpha helix: Difference between revisions
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==Structure, hydrogen bonding and composition== | ==Structure, hydrogen bonding and composition== | ||
<StructureSection load='1hhb' size='400' side='right' caption='alpha helix' scene='77/778341/Ballstick/1'> | <StructureSection load='1hhb' size='400' side='right' caption='alpha helix' scene='77/778341/Ballstick/1'> | ||
An alpha helix 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 (green) 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> | In an alpha helix, the main chain arranges in a <scene name='77/778341/Ribbon/1'>right-handed helix</scene> with the side chains (green) 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> | ||
