RESUMO
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RESUMO
In the present study, we sequenced the complete mitochondrial genome (mitogenome) of Agrius convolvuli (Lepidoptera: Sphingidae) and compared it with previously sequenced mitogenomes of lepidopteran species. The mitogenome was a circular molecule, 15 349 base pairs (bp) long, containing 37 genes. The order and orientation of genes in the A. convolvuli mitogenome were similar to those in sequenced mitogenomes of other lepidopterans. All 13 protein-coding genes (PCGs) were initiated by ATN codons, except for the cytochrome c oxidase subunit 1 (cox1) gene, which seemed to be initiated by the codon CGA, as observed in other lepidopterans. Three of the 13 PCGs had the incomplete termination codon T, while the remainder terminated with TAA. Additionally, the codon distributions of the 13 PCGs revealed that Asn, Ile, Leu2, Lys, Phe, and Tyr were the most frequently used codon families. All transfer RNAs were folded into the expected cloverleaf structure except for tRNASer(AGN), which lacked a stable dihydrouridine arm. The length of the adenine (A) + thymine (T)-rich region was 331 bp. This region included the motif ATAGA followed by a 19-bp poly-T stretch and a microsatellite-like (TA)8 element next to the motif ATTTA. Phylogenetic analyses (maximum likelihood and Bayesian methods) showed that A. convolvuli belongs to the family Sphingidae.
Assuntos
Genoma Mitocondrial , Ipomoea batatas/parasitologia , Lepidópteros/genética , Animais , Composição de Bases , Biologia Computacional/métodos , DNA Intergênico , Ordem dos Genes , Sequenciamento de Nucleotídeos em Larga Escala , Lepidópteros/classificação , Anotação de Sequência Molecular , Fases de Leitura Aberta , FilogeniaRESUMO
In this study, we sequenced the complete mitochondrial genome of Eligma narcissus and compared it with 18 other lepidopteran species. The mitochondrial genome (mitogenome) was a circular molecule of 15,376 bp containing 13 protein-coding genes (PCGs), 22 transfer RNA (tRNA) genes, two ribosomal RNA (rRNA) genes and an adenine (A) + thymine (T) - rich region. The positive AT skew (0.007) indicated the occurrence of more As than Ts. The arrangement of 13 PCGs was similar to that of other sequenced lepidopterans. All PCGs were initiated by ATN codons, except for the cytochrome c oxidase subunit 1 (cox1) gene, which was initiated by the CGA sequence, as observed in other lepidopterans. The results of the codon usage analysis indicated that Asn, Ile, Leu, Tyr and Phe were the five most frequent amino acids. All tRNA genes were shown to be folded into the expected typical cloverleaf structure observed for mitochondrial tRNA genes. Phylogenetic relationships were analyzed based on the nucleotide sequences of 13 PCGs from other insect mitogenomes, which confirmed that E. narcissus is a member of the Noctuidae superfamily.
Assuntos
Genoma Mitocondrial , Mariposas/genética , Sequência Rica em At , Animais , Sequência de Bases , Códon , Sequência Conservada , Proteínas de Insetos/genética , Sequências Repetidas Invertidas , Proteínas Mitocondriais/genética , Anotação de Sequência Molecular , Filogenia , RNA Ribossômico/genética , RNA de Transferência/genética , Sequenciamento Completo do GenomaRESUMO
The complete mitochondrial genome (mitogenome) of Plutella xylostella (Lepidoptera: Plutellidae) was determined (GenBank accession No. KM023645). The length of this mitogenome is 16,014 bp with 13 protein-coding genes (PCGs), 2 rRNA genes, 22 tRNA genes and an A + T-rich region. It presents the typical gene organization and order for completely sequenced lepidopteran mitogenomes. The nucleotide composition of the genome is highly A + T biased, accounting for 81.48%, with a slightly positive AT skewness (0.005). All PCGs are initiated by typical ATN codons, except for the gene cox1, which uses CGA as its start codon. Some PCGs harbor TA (nad5) or incomplete termination codon T (cox1, cox2, nad2 and nad4), while others use TAA as their termination codons. The A + T-rich region is located between rrnS and trnM with a length of 888 bp.
Assuntos
DNA Mitocondrial/química , Genoma Mitocondrial , Mariposas/genética , Animais , Sequência de Bases , Dados de Sequência Molecular , Conformação de Ácido Nucleico , Motivos de Nucleotídeos , Análise de Sequência de DNARESUMO
Small heat shock proteins (sHSPs) can regulate protein folding and protect cells from stress. To investigate the role of sHSPs in the silk-producing insect Antheraea pernyi (A. pernyi; Lepidoptera: Saturniidae), cDNA encoding HSP20.8 in A. pernyi, termed Ap-sHSP20.8, was identified as a 564 bp ORF. The translated amino acid sequence encoded 187 residues with a calculated molecular mass of 20.8 kDa and an isoelectronic point (pI) of 5.98; the sequence showed homology to sHSP chaperone proteins from other insects. Ap-sHSP20.8 mRNA transcript expression was abundant in the midgut and fat body and found to be both constitutive and inducible by infectious stimuli. Therefore, Ap-sHSP20.8 may play important roles in A. pernyi immune responses under biotic stress. Furthermore, we found that eicosanoids could mediate the induction of Ap-sHSP20.8 in the fat body and midgut. Our findings show that sHSPs may be promising molecules to target in order to cripple immunity in insect pests.
Assuntos
Proteínas de Choque Térmico Pequenas/genética , Proteínas de Insetos/genética , Mariposas/genética , Sequência de Aminoácidos , Animais , Botrytis/imunologia , Eicosanoides/imunologia , Eicosanoides/farmacologia , Escherichia coli/imunologia , Corpo Adiposo/efeitos dos fármacos , Corpo Adiposo/imunologia , Corpo Adiposo/metabolismo , Corpo Adiposo/microbiologia , Regulação da Expressão Gênica no Desenvolvimento , Proteínas de Choque Térmico Pequenas/imunologia , Proteínas de Insetos/imunologia , Mucosa Intestinal/metabolismo , Intestinos/efeitos dos fármacos , Intestinos/imunologia , Intestinos/microbiologia , Ponto Isoelétrico , Larva/efeitos dos fármacos , Larva/genética , Larva/crescimento & desenvolvimento , Larva/imunologia , Dados de Sequência Molecular , Mariposas/efeitos dos fármacos , Mariposas/crescimento & desenvolvimento , Mariposas/imunologia , Nucleopoliedrovírus/imunologia , Fases de Leitura Aberta , Homologia de Sequência de Aminoácidos , Estresse FisiológicoRESUMO
Analgesics such as morphine cause many side effects including addiction, but kappa-opioid receptor agonist can produce antinociception without morphine-like side effects. With the aim of developing new and potent analgesics with lower abuse potential, we studied the antinociceptive and physical dependent properties of a derivate of ICI-199441, an analogue of (-)U50,488H, named (2-(3,4-dichloro)-phenyl)-N-methyl-N-[(1S)-1-(2-isopropyl)-2-(1-(3-pyrrolinyl))ethyl] acetamides (LPK-26). LPK-26 showed a high affinity to kappa-opioid receptor with the Ki value of 0.64 nM and the low affinities to micro-opioid receptor and delta-opioid receptor with the Ki values of 1170 nM and >10,000 nM, respectively. It stimulated [(35)S]GTPgammaS binding to G-proteins with an EC50 value of 0.0094 nM. In vivo, LPK-26 was more potent than (-)U50,488H and morphine in analgesia, with the ED50 values of 0.049 mg/kg and 0.0084 mg/kg in hot plat and acetic acid writhing tests, respectively. Moreover, LPK-26 failed to induce physical dependence, but it could suppress naloxone-precipitated jumping in mice when given simultaneously with morphine. Taken together, our results show that LPK-26 is a novel selective kappa-opioid receptor agonist with highly potent antinociception effects and low physical dependence potential. It may be valuable for the development of analgesic and drug that can be used to reduce morphine-induced physical dependence.
