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(A) Molecular organization of putative terminal oxidase in the genome assembly of MSR-1. Dashed lines indicate the extent of deletions in mutant strains. (B and C) Transcription of putative terminal oxidase operons with gusA as a reporter in WT (B) and ΔMgfnr mutant (C) cells. Cultures were grown aerobically (21% O2) in nitrate and ammonium medium or microaerobically (2% O2) in nitrate and ammonium medium. Expression was measured by β-glucuronidase activities.
