Table 1. Average distances (Å) between the centre of mass of the different aromatic sites (FAD isoalloxazine ring and Tyr, Phe or Trp side chain) involved in the FAD reduction in PhrB WT and its mutants Y391F, Y391A, Y391Wp and Y391Wd.
| WT | Y391F | Y391A | Y391Wp | Y391Wd | |
| FAD–A | 7.89 | 8.21 | — | 7.19 | 7.54 |
| A–B | 5.29 | 5.24 | — | 6.09 | 5.45 |
| B–C | 6.65 | 6.51 | 6.51 | 6.22 | 6.40 |
| FAD–B | 12.28 | 12.70 | 12.36 | 12.76 | 12.07 |
| FAD–Tyr395 | 8.28 | 8.06 | 8.29 | 8.03 | 7.67 |
| Tyr395-B | 6.77 | 6.93 | 6.95 | 7.01 | 7.00 |