TY - JOUR
T1 - Gene identification and proteomic analysis of the esterases of the cotton bollworm, Helicoverpa armigera
AU - Teese, Mark G.
AU - Campbell, Peter M.
AU - Scott, Colin
AU - Gordon, Karl H. J.
AU - Southon, Adam
AU - Hovan, Daniel
AU - Robin, Charles
AU - Russell, Robyn J.
AU - Oakeshott, John G.
N1 - Corrigendum can be found in Insect Biochemistry and Molecular Biology, Volume 40(12), 909, http://dx.doi.org/10.1016/j.ibmb.2010.09.002
PY - 2010/1
Y1 - 2010/1
N2 - Some of the resistance of Helicoverpa armigera to conventional insecticides such as organophosphates and synthetic pyrethroids appears to be due to metabolic detoxification by carboxylesterases. To investigate the H. armigera carboxyl/cholinesterases, we created a data set of 39 putative paralogous H. armigera carboxyl/cholinesterase sequences from cDNA libraries and other sources. Phylogenetic analysis revealed a close relationship between these sequences and 70 carboxyl/cholinesterases from the recently sequenced genome of the silkworm, Bombyx mori, including several conserved clades of non-catalytic proteins. A juvenile hormone esterase candidate from H. armigera was identified, and B. mori orthologues were proposed for 31% of the sequences examined, however low similarity was found between lepidopteran sequences and esterases previously associated with insecticide resistance from other insect orders. A proteomic analysis of larval esterases then enabled us to match seven of the H. armigera carboxyl/cholinesterase sequences to specific esterase isozymes. All identified sequences were predicted to encode catalytically active carboxylesterases, including six proteins with N-terminal signal peptides and N-glycans, with two also containing C-terminal signals for glycosylphosphatidylinositol anchor attachment. Five of these sequences were matched to zones of activity on native PAGE at relative mobility values previously associated with insecticide resistance in this species.
AB - Some of the resistance of Helicoverpa armigera to conventional insecticides such as organophosphates and synthetic pyrethroids appears to be due to metabolic detoxification by carboxylesterases. To investigate the H. armigera carboxyl/cholinesterases, we created a data set of 39 putative paralogous H. armigera carboxyl/cholinesterase sequences from cDNA libraries and other sources. Phylogenetic analysis revealed a close relationship between these sequences and 70 carboxyl/cholinesterases from the recently sequenced genome of the silkworm, Bombyx mori, including several conserved clades of non-catalytic proteins. A juvenile hormone esterase candidate from H. armigera was identified, and B. mori orthologues were proposed for 31% of the sequences examined, however low similarity was found between lepidopteran sequences and esterases previously associated with insecticide resistance from other insect orders. A proteomic analysis of larval esterases then enabled us to match seven of the H. armigera carboxyl/cholinesterase sequences to specific esterase isozymes. All identified sequences were predicted to encode catalytically active carboxylesterases, including six proteins with N-terminal signal peptides and N-glycans, with two also containing C-terminal signals for glycosylphosphatidylinositol anchor attachment. Five of these sequences were matched to zones of activity on native PAGE at relative mobility values previously associated with insecticide resistance in this species.
KW - comparative genomics
KW - cholinesterase-like adhesion molecule
KW - midgut
KW - GPI anchor
KW - protein purification
KW - tandem mass spectrometry
UR - http://www.scopus.com/inward/record.url?scp=75949095458&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/record.url?scp=78649634210&partnerID=8YFLogxK
UR - https://doi.org/10.1016/j.ibmb.2010.09.002
U2 - 10.1016/j.ibmb.2009.12.002
DO - 10.1016/j.ibmb.2009.12.002
M3 - Article
C2 - 20005949
AN - SCOPUS:75949095458
SN - 0965-1748
VL - 40
SP - 1
EP - 16
JO - Insect Biochemistry and Molecular Biology
JF - Insect Biochemistry and Molecular Biology
IS - 1
ER -