Figure A6.

Various nitrite reductase architectures within Chloroflexi. Three different open reading frame types including a C1 cytochrome and a nitrite reductase domain appear in surveyed Chloroflexi. The most commonly seen gene features C1, C2, and cytochrome‐dependent nirS (a); however, C1 is also seen in ORFs with cupredoxin and copper‐dependent nitrite reductase (nirK) domains (b). A limited number of Chloroflexi genomes also contain ORFs placing C1, C2, and nirS together with an N‐terminal cupredoxin, plastocyanin (PetE), or similar copper‐containing domain (c). ORF, open reading frame