RESUMO
Acetylcholinesterase-1 (AChE1) is a vital enzyme involved in neurotransmission and represents an attractive insecticide-target for organophosphates and carbamates in Plutella xylostella (Linneaus), an important pest of cruciferous crops worldwide. However, insecticide-resistance often occurs due to mutations, making many organophosphates and carbamates ineffective. In particular, A298S and G324A mutations in AChE1 significantly lower the binding affinity of insecticides. In the present study, the wild-type and mutant AChE1 structures were constructed and their structural stabilities, residual flexibilities were investigated through molecular dynamics simulations. Subsequently, the structural and energetic changes responsible for the insecticide-resistance in AChE1 were analyzed using molecular docking. The results of molecular dynamics simulation showed that the mutant AChE1 shows little structural deviation than the wild-type, indicate the structural instability. Furthermore, the docking results demonstrated that these mutations break the intermolecular hydrogen bonding interactions and thereby affect the prothiofos as well as all insecticide binding. Hence, the results could provide some insights into the resistance mechanism of AChE1 in insecticides binding and helpful in the development of novel insecticides that are less susceptible to insecticide-resistance.
Assuntos
Acetilcolinesterase/genética , Acetilcolinesterase/metabolismo , Inseticidas/metabolismo , Mariposas/enzimologia , Mariposas/genética , Acetilcolinesterase/química , Substituição de Aminoácidos , Animais , Brassicaceae/parasitologia , Estabilidade Enzimática , Ligação de Hidrogênio , Resistência a Inseticidas , Simulação de Acoplamento Molecular , Simulação de Dinâmica Molecular , Mariposas/química , Mariposas/efeitos dos fármacos , Organotiofosfatos/metabolismo , Mutação Puntual , Ligação ProteicaRESUMO
MOlecular Database on Indian Insects (MODII) is an online database linking several databases like Insect Pest Info, Insect Barcode Information System (IBIn), Insect Whole Genome sequence, Other Genomic Resources of National Bureau of Agricultural Insect Resources (NBAIR), Whole Genome sequencing of Honey bee viruses, Insecticide resistance gene database and Genomic tools. This database was developed with a holistic approach for collecting information about phenomic and genomic information of agriculturally important insects. This insect resource database is available online for free at http://cib.res.in. AVAILABILITY: http://cib.res.in/.
