Fig. 4.

(a) Primary structure of PSFMO, with secondary structure assignment, created using DSSP [32], [33] and represented using ALINE [34]. (b) Structure of PSFMO monomer, in ribbon format. One FAD molecule per monomer is shown in cylinder format with carbon atoms in grey. Helix α9, which with helix α10 forms part of the flexible helix–loop–helix structure over the active site, and for which electron density is continuous in the PSFMO structure, is also highlighted.