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A-Level Biology OCR A

Structure Long Form End Tropocollagen Describe Collagen Polypeptides

Front Describe structure of collagen.
Back Collagen structure:
  • Three polypeptides wound together in long rope-like triple helix structure
  • Every third amino acid is glycine that allows close packing
  • Hydrogen bonds between pp chains form long quaternary proteins with staggered ends - allow them to join end to end to form long tropocollagen fibrils
  • Tropocollagen cross link to produce strong fibres
  • High proportion of proline and hydroxyproline that repel each other giving stability

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