This domain represents one of the two dimerisation regions of the protein, located at the edge of the dimer interface, at the C-terminus, being the last three beta strands, S6, S7, and S8 along with the last three residues to the end. In Swiss:P21159, S6 runs from residues 178-192, S7 from 200-206 and S8 from 211-215. the extended loop, of residues 167-177 may well be involved in the pocket formed between the two dimers that positions the FMN molecule [1].To date, the only time functional oxidase or phenazine biosynthesis activities have been experimentally demonstrated is when the sequences contain both Pfam:PF01243 and Pfam:PF10590. It is unknown the role performed by each domain in bringing about molecular functions of either oxidase or phenazine activity [2].

1: X-ray structure of Escherichia coli pyridoxine 5'-phosphate oxidase complexed with FMN at 1.8 A resolution. Safo MK, Mathews I, Musayev FN, di Salvo ML, Thiel DJ, Abraham DJ, Schirch V; Structure. 2000;8:751-762. PMID:10903950

2: Experimental Evidence for a Revision in the Annotation of Putative Pyridoxamine 5'-Phosphate Oxidases P(N/M)P from Fungi. Domitrovic T, Raymundo DP, da Silva TF, Palhano FL; PLoS One. 2015;10:e0136761. PMID:26327315