Peptidyl-prolyl cist/trans isomerases (PPIases) are a family of proteins that are present in a wide range of species, display an interesting multi-domain structure, and because of their affinity for proline residues, are involved in a diversity of biological processes. This volume presents the latest information on their sequences, structures, and functions, their distribution within the cell, their interactions with other proteins and ligands, and their involvement
in signalling pathways.