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Article

Stable isotopic signature of dissimilatory nitrate reduction is robust against enzyme mutation.

Proceedings of the National Academy of Sciences of the United States of America - 26 Nov 2024

Asamoto Ciara K, Ryu Yeongjun, Eckartt Kelly N, Kelley-Kern Julia, Dietrich Lars E P, Sigman Daniel M, Kopf Sebastian H

Abstract excerpt

The proportionality of oxygen-to-nitrogen isotope effects (18ε/15ε) is used as a key isotopic signature of nitrogen cycling processes in the environment. Dissimilatory nitrate reduction is observed to have an 18ε/15ε proportionality of ~0.9 in marine and ~0.6 in freshwater/terrestrial ecosystems. The origins of this difference are uncertain, with both geochemical and biological factors conceivably at play. One...

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PMID: 39576351
DOI: 10.1073/pnas.2416002121
PMCID: PMC11621745

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