Some review on PPII helices:

Adzhubei-AA, Sternberg-MJE: Left handed Polyproline helices commonly occur in globular proteins
J. Mol. Biol. (1993) Vol. 229: 472-493

Adzhubei-AA, Sternberg-MJE: Conservation of polyproline helices in homologous proteins...
Protein Science (1994) Vol. 3(12): 2395-410
Here is a kinamage for that article at Protein Science: Adzhubei.kin

On SH3 domains:
Mayer-BJ, Eck-MJ: Minding your p`s and q`s
Current Biology (1995) Vol. 5(4): 364-7

On collagen structure:
in PPS97 Section 11


I wish to thank for all the organisers of Principles of Protein Structure 97.

These files will be also available at :

by Zoltan Szabo 1997

Department of Medical Chemistry, Albert Szent-Gyorgyi Medical University, Hungary, Szeged