| 词条 | Collagen helix |
| 释义 |
| Symbol = Collagen | Name = Collagen triple helix | image = 1K6F Crystal Structure Of The Collagen Triple Helix Model Pro- Pro-Gly103 04.png | width = | caption = Model of a collagen helix.[1] | Pfam = PF01391 | InterPro = IPR008160 | SMART = | PROSITE = | SCOP = 1a9a | TCDB = | OPM family = | OPM protein = | PDB = {{PDB2|1q7d}}, {{PDB2|1rj7}}, {{PDB2|1rj8}} }} In collagen, the collagen helix, or type-2 helix, is a major shape in secondary structure. It consists of a triple helix made of the repetitious amino acid sequence glycine - X - Y, where X and Y are frequently proline or hydroxyproline.[2][3]A collagen triple helix has 3.3 residues per turn.[4] Each of the three chains is stabilized by the steric repulsion due to the pyrrolidine rings of proline and hydroxyproline residues. The pyrrolidine 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 does not participate in hydrogen bonding but stabilises the trans isomer of proline by stereoelectronic effects, therefore stabilizing the entire triple helix. The rise of the collagen helix (superhelix) is 2.9 Å (0.29 nm) per residue. References1. ^{{cite journal |vauthors=Berisio R, Vitagliano L, Mazzarella L, Zagari A |title=Crystal structure of the collagen triple helix model [(Pro-Pro-Gly)(10)](3) |journal=Protein Sci. |volume=11 |issue=2 |pages=262–70 |date=February 2002 |pmid=11790836 |pmc=2373432 |doi=10.1110/ps.32602 |url=}} {{Protein tandem repeats}}{{Protein secondary structure}}{{DEFAULTSORT:Collagen Helix}}{{protein-stub}}2. ^{{cite journal |vauthors=Bhattacharjee A, Bansal M |title=Collagen structure: the Madras triple helix and the current scenario |journal=IUBMB Life |volume=57 |issue=3 |pages=161–72 |date=March 2005 |pmid=16036578 |doi=10.1080/15216540500090710}} 3. ^{{cite book|last1=Saad|first1=Mohamed|title=Low resolution structure and packing investigations of collagen crystalline domains in tendon using Synchrotron Radiation X-rays, Structure factors determination, evaluation of Isomorphous Replacement methods and other modeling.|date=Oct 1994|publisher=PhD Thesis, Université Joseph Fourier Grenoble I|pages=1–221|url=https://drive.google.com/open?id=0B3L_EN9hIuFTTkhuN2lrWEU4RDQ&authuser=0 |doi= 10.13140/2.1.4776.7844}} 4. ^Harpers Illustrated Biochemistry, 30th edition 5 : Protein structural motifs|Helices|Protein families|Articles lacking sources from June 2009|All articles lacking sources |
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