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Molecular characterization of the amplified aldehyde oxidase from insecticide resistant Culex quinquefasciatus

Coleman, Michael ORCID:, Vontas, John and Hemingway, Janet ORCID: (2002) 'Molecular characterization of the amplified aldehyde oxidase from insecticide resistant Culex quinquefasciatus'. European Journal of Biochemistry, Vol 269, Issue 3, pp. 768-779.

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Primary structural information including the complete nucleotide sequence of the first insect aldehyde oxidase (AO) was obtained from the common house mosquito Culex quinquefasciatus (Say) through cloning and sequencing of both genomic DNA and cDNA. The deduced amino-acid sequence encodes a 150-kDa protein of 1266 amino-acid residues, which is consistent with the expected monomeric subunit size of AO. The Culex AO sequence contains a molybdopterin cofactor binding domain and two iron-sulfur centres. A comparison of the partial sequences of AO from insecticide resistant and susceptible strains of C. quinquefasciatus shows two distinct alleles of this enzyme, one of which is amplified in the insecticide resistant strain on a 30-kb DNA amplicon alongside two resistance-associated esterases. The amplified AO gene results in elevated AO activity in all life stages, but activity is highest in 3rd instar larvae. The elevated enzyme can be seen as a separate band on polyacrylamide gel electrophoresis. The role of AO in xenobiotic oxidation in mammals and the partial inhibition of elevated AO activity by a range of insecticides in Culex, suggest that this AO may play a role in insecticide resistance.

Item Type: Article
Subjects: QU Biochemistry > Enzymes > QU 136 Hydrolases
QU Biochemistry > Genetics > QU 470 Genetic structures
QX Parasitology > Insects. Other Parasites > QX 510 Mosquitoes
QX Parasitology > Insects. Other Parasites > QX 530 Culex
QX Parasitology > Insects. Other Parasites > QX 600 Insect control. Tick control
Faculty: Department: Groups (2002 - 2012) > Vector Group
Digital Object Identifer (DOI):
Depositing User: Lynn Roberts-Maloney
Date Deposited: 03 Oct 2013 10:44
Last Modified: 06 Feb 2018 13:04


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