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A-Level Biology OCR A

Structure Long Form End Tropocollagen Describe Collagen Polypeptides

Collagen structure consists of three polypeptides wound into a rope-like triple helix, with glycine at every third amino acid for close packing, and hydrogen bonds forming staggered tropocollagen fibrils.

La estructura del colágeno consiste en tres polipéptidos enrollados en una triple hélice similar a una cuerda, con glicina en cada tercer aminoácido para un empaquetamiento cercano, y enlaces de hidrógeno que forman fibrillas de tropocolágeno entrelazadas.

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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