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Significance Stable expression of each component of the nitrogenase system in an active form is a prerequisite for engineering nitrogen fixation in eukaryotic cells. Mitochondria provide an oxygen-depleted environment for the expression of active nitrogenase in plants, but signal peptides are required to target nuclear encoded Nif proteins to this organelle. We demonstrate that one of the structural subunits of nitrogenase, NifD, is itself susceptible to cleavage by mitochondrial processing peptidases from a variety of plant origins, presenting a major challenge to engineering nitrogen fixation in mitochondria. To overcome this issue, we have engineered NifD variants that are resistant to cleavage and retain high levels of nitrogenase activity, thus providing a potential solution for engineering active MoFe protein in plants.

Using synthetic biology to overcome barriers to stable expression of nitrogenase in eukaryotic organelles