Overview of operon organization of Cp9-redoxins, NrdH-redoxins, and BC3987.

(A) The gene encoding the Cp9-redoxin is located between a thioredoxin reductase (cp34) and a peroxiredoxin (cp20). (B) The classical class Ib RNR operon where the NrdH-redoxin is found in front of the genes encoding the flavodoxin-like protein NrdI, the catalytic subunit NrdE and the radical/metal cofactor containing NrdF protein. (C) The organization of class Ib RNR genes in the Bacillus cereus group where the putative NrdH-redoxin (BC3987) is located elsewhere in the genome.