Fibrous proteins Flashcards
1
Q
Collagen: how many strands, common residues, and direction of rotation
A
Three amino acid strands
every 2nd amino acid is proline
every 3rd amino acid is glycine
X-pro-gly-X-pro-gly
30% glycine
Right handed helices turned around to the left
Glycine is so small it can fit in interior
2
Q
Why is glycine important and in what molecule
A
collagen, because it’s so small
proline helps give it enough “kink” to make the turns
polyproline spontaneously forms collagen
