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Fungal Genet Biol. 2003 Feb;38(1):10-21.

Tandem cytochrome P450 monooxygenase genes and splice variants in the white rot fungus Phanerochaete chrysosporium: cloning, sequence analysis, and regulation of differential expression.

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Molecular Toxicology Division, Department of Environmental Health, College of Medicine, University of Cincinnati, Cincinnati, OH 45267-0056, USA.


Phanerochaete chrysosporium, the model white rot fungus, uses P450 monooxygenation for oxidation of xenobiotic chemicals. To characterize its P450 systems, we have isolated two tandemly linked full-length P450 monooxygenase genes, pc-1 (2510bp) and pc-2 (2503bp). cDNA sequence and splice site analysis showed multiple small putative introns (35-82bp), 17 in pc-1 and 16 in pc-2. The deduced P450 proteins PC-1 (531 aa, MW 60,070) and PC-2 (538 aa, MW 61,765) showed 55% aa identity with each other and low relatedness (25-36%) with P450 gene families CYP52, CYP86, CYP4, and CYP3 decreasing in that order. Alternate splicing was identified for pc-1 transcription. Real-time quantitative RT-PCR analysis on 4-day cultures showed an elevated level of expression ( approximately 8-fold) of pc-1 in nutrient-limited (ligninolytic) as compared to nutrient-rich (non-ligninolytic) conditions. Interestingly, the pc-1 gene is expressible in both primary and secondary phases of growth with peak expression occurring with secondary metabolism.

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