Characterization of the Second Form of NADH-Cytochrome, b5 Reductase Gene from Arachidonic Acid-Producing Fungus Mortierella alpina 1S-4

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  • Characterization of the Second Form of NADH-Cytochrome b5 Reductase Gene from Arachidonic Acid-Producing Fungus Mortierella alpina 1S-4

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The second type of cytochrome b5 reductase (Cb5R-II) gene was characterized in the arachidonic acid-producing fungus Mortierella alpina 1S-4. Its cDNA (897 bp) and predicted amino acid (298 aa) sequences show more than 70% similarity to the previously isolated first type of Cb5R. Highly conserved exon-intron organization suggests that the two genes evolved from the duplication of a common ancestral gene. Cb5R-II has a flavin-binding domain at its highly hydrophobic N-terminal and an NADH-binding domain at the C-terminal. In comparison with Cb5R genes from other sources, high homology (46-54%) was found for yeast and plant genes. Phylogenetic analysis revealed that microbial and plant Cb5R genes represent a gene family evolved from one prototype and are different from mammalian Cb5R genes.

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