Crystal structure of human collagen XVIII trimerization domain: A novel collagen trimerization Fold.
Boudko, S.P., Sasaki, T., Engel, J., Lerch, T.F., Nix, J., Chapman, M.S., Bachinger, H.P.(2009) J Mol Biol 392: 787-802
- PubMed: 19631658 
- DOI: 10.1016/j.jmb.2009.07.057
- Primary Citation of Related Structures:  
3HON, 3HSH - PubMed Abstract: 
Collagens contain a unique triple-helical structure with a repeating sequence -G-X-Y-, where proline and hydroxyproline are major constituents in X and Y positions, respectively. Folding of the collagen triple helix requires trimerization domains. Once trimerized, collagen chains are correctly aligned and the folding of the triple helix proceeds in a zipper-like fashion ...