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The Escherichia coli regulatory protein fumarate nitrate reduction (FNR) mediates a global transcriptional response upon O 2 deprivation. Spanning nearly 40 years of research investigations, our understanding of how FNR senses and responds to O 2 has considerably progressed despite a lack of structural information for most of that period. This knowledge has established the paradigm for how facultative anaerobic bacteria sense changes in O 2 tension. Recent Advances: Recently, the X-ray crystal structure of Aliivibrio fischeri FNR with its [4Fe-4S] cluster cofactor was solved and has provided valuable new insight into FNR structure and function. These findings have alluded to the conformational changes that may occur to alter FNR activity in response to O 2 .

Reassessing the Structure and Function Relationship of the O2Sensing Transcription Factor FNR

Reassessing the Structure and Function Relationship of the O₂Sensing Transcription Factor FNR