Fig 2.

Overall structure of P9-1. The ribbon diagrams show the P9-1 asymmetric monomer (A) and dimer (B). The diagrams in the right column were generated after rotation of the left images by 90°. Ribbon representations of P9-1 show polypeptide chains in rainbow colors from blue (amino-terminal region) to red (carboxy-terminal region). The amino and carboxyl termini are indicated. Secondary structural elements are labeled sequentially. (C) Dimer interface of P9-1. The upper molecule is shown by a ribbon, and intermolecular interacting side chains are shown as ball-and-stick models. The lower molecule is shown as a molecular surface model, and regions of intermolecular interaction are colored orange. Numbers of some residues and secondary structural elements are labeled to facilitate identification.