FIGURE 2.

Typical arrangements of genes for ApbE, Na⁺-NQR, RNF, and other FMN-binding proteins in bacterial chromosomes. Genes for Na⁺-NQR and RNF subunits are indicated by the last letters in their standard designations. apbE genes together with their accepted alternative designations are shown as rectangles, genes for FMN-binding Na⁺-NQR and RNF subunits, UrdA, NosR, and other FMN-binding proteins (fmnb) are indicated by gray shading. The connecting lines refer to intercalating sequences. The numbers above the genes indicate their numbers in genomes according to the Kyoto Encyclopedia of Genes and Genomes. The genes were detected as hits in a BLAST search of complete prokaryotic genomes using the V. harveyi proteins as the queries. Genes for FMN-binding proteins were identified using search for Pfam motifs PF04205 and PF03116.