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The in vivo hydrocarbon formation by vanadium nitrogenase follows a secondary metabolic pathway
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Journal Article
The in vivo hydrocarbon formation by vanadium nitrogenase follows a secondary metabolic pathway
2016
Overview
The vanadium (V)-nitrogenase of
Azotobacter vinelandii
catalyses the
in vitro
conversion of carbon monoxide (CO) to hydrocarbons. Here we show that an
A. vinelandii
strain expressing the V-nitrogenase is capable of
in vivo
reduction of CO to ethylene (C
2
H
4
), ethane (C
2
H
6
) and propane (C
3
H
8
). Moreover, we demonstrate that CO is not used as a carbon source for cell growth, being instead reduced to hydrocarbons in a secondary metabolic pathway. These findings suggest a possible role of the ancient nitrogenase as an evolutionary link between the carbon and nitrogen cycles on Earth and establish a solid foundation for biotechnological adaptation of a whole-cell approach to recycling carbon wastes into hydrocarbon products. Thus, this study has several repercussions for evolution-, environment- and energy-related areas.
Nitrogenases reduce inorganic nitrogen to organic ammonia in a crucial step of the nitrogen cycle. Here the authors show that the vanadium-nitrogenase of
Azotobacter vinelandii
can also catalyse the
in vivo
conversion of carbon monoxide to hydrocarbons in a secondary non-biosynthetic pathway.
