Fig. 7
β-strand conformations for four different protein folds. Ribbon diagrams of the (a) thioesterase/thiol ester dehydrase-isomerase, (b) OB, (c) TIM β/α barrel, and (d) lipocalin folds (PDB ID: 1SC0, 1LM0, 1SFS, and 1KQW, respectively). The β-strand regions that are bent and straight are colored green and blue, respectively. Because the β-strands colored white have only one frame, θUD2 could not be calculated. The α-helices are colored pink