Ligand-Protein Contacts & Contacts of Structural Units
Principles of Protein structure Birkbek College,London
Tutorial on Peptide and Protein Structure (The University of Georgia
Principles of Protein Structure....etc. (ch. 1 to 5) (ExPASy server)
Homology modelling for beginners.
Protein Structure 2 / 3D Structure Prediction & Databases at CMS
Fold recognition (Threading) methods and links