Collagen_helix Collagen_helix

Collagen helix - Definition and Overview

In collagen, the collagen helix is a major shape in secondary structure. It consists of a triple helix made of the repetitious amino acid sequence glycine - proline - hydroxyproline. Each of the three chains is stabilized by the steric repulsion due to the pyrrolidone rings of proline and hydroxyproline residues. The pyrrolidone rings keep out of each other’s way when the polypeptide chain assumes this extended helical form, which is much more open than the tightly coiled form of the alpha helix. The three chains are hydrogen bonded to each other. The hydrogen bond donors are the peptide NH groups of glycine residues. The hydrogen bond acceptors are the CO groups of residues on the other chains. The OH group of hydroxyproline also participates in hydrogen bonding. The rise of the collagen helix (superhelix) is 2.9 angstrom per residue.

See also : tertiary structure -- α helix -- β sheet

Example Usage of Collagen

LiveMyFreeLife: Chicken capsules 'can provide relief from rheumatoid arthritis': By ANI WASHINGTON - Chicken type II Collagen (CCII... http://bit.ly/5pfa2B
sterling79: Chicken capsules 'can provide relief from rheumatoid arthritis': WASHINGTON - Chicken type II Collagen .. http://bit.ly/79vdBd
perfumenthings: Adrien Arpel by Adrien Arpel - Adrien arpel swiss Collagen hydrating complex - 1 oz http://tinyurl.com/ykofqlh #ihave #forsale
Copyright 2009 WordIQ.com - Privacy Policy  :: Terms of Use  :: Contact Us  :: About Us
This article is licensed under the GNU Free Documentation License. It uses material from the this Wikipedia article.