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Volume 272, Number 31, Issue of August 1, 1997 pp. 19176-19186
©1997 by The American Society for Biochemistry and Molecular Biology, Inc.

Cloning, Yeast Expression, and Characterization of the Coupling of Two Distantly Related Arabidopsis thaliana NADPH-Cytochrome P450 Reductases with P450 CYP73A5

(Received for publication, April 9, 1997, and in revised form, May 22, 1997)

Philippe Urban , Claudia Mignotte ^§ , Michaël Kazmaier ^§¶ , Frédéric Delorme and Denis Pompon

From the  Centre de Génétique Moléculaire du CNRS, 91198 Gif-sur-Yvette, France, the ^§ Centre Orsan de Recherches en Biotechnologies, 91953 Les Ulis, France, and the ^¶ Service de Radiophysiologie Végétale du CEA, 13108 St. Paul-Lès-Durance, France

Two NADPH-cytochrome P450 reductase-encoding cDNAs were isolated from an Arabidopsis cDNA library by metabolic interference in a Saccharomyces cerevisiae mutant disrupted for its endogenous cpr1 gene. ATR1 encodes a protein of 692 amino acids, while ATR2 encodes either a 712-residue protein (ATR2-1), or a 702-residue protein (ATR2-2) depending on the choice of the initiation codon. Comparative analysis of ATR1 and ATR2-1 indicates 64% amino acid sequence identity and the absence of conservation in the third base of conserved amino acid codons. The two Arabidopsis reductases are encoded by distinct genes whose divergence is expected an early event in angiosperms evolution. A poly(Ser/Thr) stretch reminiscent of a plant chloroplastic targeting signal is present at the ATR2-1 N-terminal end but absent in ATR1. The cDNA open reading frames were expressed in yeast. The recombinant polypeptides were found present in the yeast endoplasmic reticulum membrane and exhibited a high specific NADPH-cytochrome c reductase activity. To gain more insight into the respective functions of the two reductases, the Arabidopsis cDNA encoding cinnamate 4-hydroxylase (CYP73A5) was cloned and co-expressed with ATR1 or ATR2 in yeast. Biochemical characterization of the Arabidopsis ATR1/CYP73A5 and ATR2-1/CYP73A5 systems demonstrates that the two distantly related Arabidopsis reductases similarly support the first oxidative step of the phenylpropanoid general pathway.

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