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Cofactor maturase NifEN: A prototype ancient nitrogenase?

Journal Article · · Science Advances

Nitrogenase plays a key role in the global nitrogen cycle; yet, the evolutionary history of nitrogenase and, particularly, the sequence of appearance between the homologous, yet distinct NifDK (the catalytic component) and NifEN (the cofactor maturase) of the extant molybdenum nitrogenase, remains elusive. Here, we report the ability of NifEN to reduce N2 at its surface-exposed L-cluster ([Fe8S9C]), a structural/functional homolog of the M-cluster (or cofactor; [(R-homocitrate)MoFe7S9C]) of NifDK. Furthermore, we demonstrate the ability of the L-cluster–bound NifDK to mimic its NifEN counterpart and enable N2 reduction. These observations, coupled with phylogenetic, ecological, and mechanistic considerations, lead to the proposal of a NifEN-like, L-cluster–carrying protein as an ancient nitrogenase, the exploration of which could shed crucial light on the evolutionary origin of nitrogenase and related enzymes.

Research Organization:
University of California, Irvine, CA (United States)
Sponsoring Organization:
USDOE Office of Science (SC); National Institutes of Health (NIH)
Grant/Contract Number:
SC0016510
OSTI ID:
2472185
Journal Information:
Science Advances, Journal Name: Science Advances Journal Issue: 24 Vol. 10; ISSN 2375-2548
Publisher:
AAASCopyright Statement
Country of Publication:
United States
Language:
English

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