Comparison of β-barrels occurring in selected structuresa yielding top DALI Z-scores after full structure alignment with YxeF.

aStructures were selected among those with the top DALI Z-score (see text) when aligned with the entire folded YxeF domain (residues 32–132), and they are ranked according to the Z-score from that comparison (right-most column). The location of the β-strands forming the β-barrels were identified using the program STRIDE4 and pairwise structural comparisons of the β-barrels was again performed using the program DALI.16,58 R.m.s.d. values were calculated after superposition of the Cα atoms. Structures of proteins other than E. coli Blc (seventh row, highlighted in bold) are designated by their PDB IDs: 1Y4H (chain C) is staphostatin B; 3D95 (chain B) is the cellular retinoic acid-binding protein II; 1JJJ (chain A) is the human epidermal-type fatty acid-binding protein; 2QMI_C (chain B) is the C-terminal domain of protease Pab87; 3AKM (chain A) is the human intestinal fatty acid binding protein; 1P6P is the toad liver basic fatty acid-binding protein. For comparison, the values for avidin (PDB ID 2CAM, chain A) are also provided (bottom row; see also Figure 6).