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The reduction of oxygen to water is crucial to life and a central metabolic process. To fulfil this task, prokaryotes use among other enzymes cytochrome bd oxidases (Cyt bds) that also play an important role in bacterial virulence and antibiotic resistance. To fight microbial infections by pathogens, an in-depth understanding of the enzyme mechanism is required. Here, we combine bioinformatics, mutagenesis, enzyme kinetics and FTIR spectroscopy to demonstrate that proton delivery to the active site contributes to the rate limiting step