Secondary structure

• what is the secondary structure most well-known for?

  this is the shape that the polypeptide chain forms as a result of hydrogen bonding between the =O on -CO groups and the -H on -NH groups in the peptide bonds along the chain
• what does the shape that the polypeptide chain forms cause?

  this causes the long polypeptide chain to be twisted into a 3D shape
• what are the arrangements that the 3D shape can make?

  • alpha-helix
  • beta-pleated sheet
• whats an example of a protein that contains a-helix?

  the protein keratin has a high proportion of a-helix
• whats an example of a protein that contain B-pleated sheets?

  fibroin, in silk, has a high proportion of B-pleated sheet
• what are these structure of?

  alpha-helix and beta-pleated sheets