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Insect Biochem Mol Biol. 1995 Feb;25(2):275-83.

cDNA and deduced protein sequence of CYP6D1: the putative gene for a cytochrome P450 responsible for pyrethroid resistance in house fly.

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Department of Entomology, Cornell University, Ithaca, NY 14853.


A microsomal cytochrome P450 from the house fly (Musca domestica), termed P450lpr, is involved in P450 monooxygenase-mediated pyrethroid resistance and is expressed at 8-fold higher levels in the insecticide resistant LPR strain compared to a susceptible strain. An internal cDNA sequence was amplified by polymerase chain reaction (PCR) using degenerate primers based on known P450lpr polypeptide sequences, and the remainder of the sequence was amplified by single side-specific PCR. A 1.8 kb cDNA sequence was obtained from 3 overlapping PCR products, with an open reading frame encoding a P450 protein of 516 residues (M(r) 59,182). This gene has been designated CYP6D1 within the P450 gene superfamily. CYP6D1 exhibits most similarity (28.2-29.8% positional identity) to butterfly CYP6B1, house fly CYP6A1 and Drosophila CYP6A2, and also exhibits comparable similarity (24.7% identity) to rat CYP3A1. The deduced protein sequence contains a hydrophobic N-terminal region and conserved sequences thought to be involved in heme-binding and electron donor-protein interactions. Comparison of CYP6D1 with its four most similar proteins (CYP6B1, CYP6A1, CYP6A2 and CYP3A1) reveals the presence of extensive stretches of residues in an alignment row in 2 possible substrate-binding regions. Three introns of 74, 66 and 64 bp, having 5'-GT and AG-3' ends, split the CYP6D1 coding region in genomic DNA. Results indicate that CYP6D1 is likely the P450lpr gene.

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