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. 1997 Nov;115(3):1135–1143. doi: 10.1104/pp.115.3.1135

Analysis of wild-type and mutant plant nitrate reductase expressed in the methylotrophic yeast Pichia pastoris.

W Su 1, J A Mertens 1, K Kanamaru 1, W H Campbell 1, N M Crawford 1
PMCID: PMC158578  PMID: 9390442

Abstract

Recombinant Arabidopsis thaliana NADH:nitrate reductase (NR; EC 1.6.6.1) was produced in the methylotrophic yeast Pichia pastoris and purified to near-electrophoretic homogeneity. Purified enzyme had the spectral and kinetic properties typical of highly purified NR from natural plant sources. Site-directed mutagenesis altering several key residues and regions was carried out, and the mutant enzyme forms were expressed in P. pastoris. When the invariant cysteine residue, cysteine-191, in the molybdo-pterin region of the A. thaliana NIA2 protein was replaced with serine or alanine, the NR protein was still produced but was inactive, showing that this residue is essential for enzyme activity. Deletions or substitutions of the conserved N terminus of NR retained activity and the ability to be inactivated in vitro when incubated with ATP. Enzyme with a histidine sequence appended to the N terminus was still active and was easily purified using metal-chelate affinity chromatography. These results demonstrate that P. pastoris is a useful and reliable system for producing recombinant holo-NR from plants.

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Selected References

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