暗黑鰓金龜雌雄觸角差異蛋白質(zhì)組學(xué)分析
[Abstract]:(Holotrichia parallela Motschulsky) belongs to the family Coleoptera, and its larvae are called grub, which is an important underground pest, which can cause serious damage to crops, vegetables and fruit trees. Therefore, the effective prevention and cure dark gills golden tortoise has become the question which urgently needs to be solved. The olfactory system is essential for insects to find hosts, mates and other behaviors. Understanding the insect olfactory system will help to develop new control strategies to control pests. Including the use of insect olfactory recognition mechanism to disperse or attract pests for control purposes. Differential proteomics, which can reveal olfactory related proteins, is an important measure to elucidate the molecular recognition mechanism of antennae olfaction. In order to clarify the mechanism of olfactory recognition of the antennae, we used protein two-dimensional electrophoresis (2-DE), mass spectrometry (MS) and bioinformatics analysis techniques to analyze and verify the function of male and female antennae proteins. The preparation of protein sample is one of the key links in 2-DE proteomics. In order to establish a stable platform for the study of antennal proteomics, four methods for the preparation of antennal proteins (TCA/ acetone precipitation method, saturated phenol method, PEG method and direct extraction method) were analyzed and optimized. According to protein yield, SDS-PAGE electrophoresis and protein number analysis, it was found that TCA/ acetone precipitation method was the best method for extracting antennal proteins. Using software ImageMaster2D Platinum7.0 to analyze the two dimensional electrophoresis patterns of silver-stained proteins, it was found that about 1,100 protein spots could be detected on each gel. The results of differential protein analysis showed that there were significant changes in 47 protein spots (1.5 foldsp-value 0.05) in the male and female antennae. Among them, 25 protein spots were up-regulated in male antennae and 22 protein spots were up-regulated in female antennae. In order to identify differentially expressed proteins in the antennae, the protein spots isolated from the gel were analyzed by MALDI-TOF/TOF MS mass spectrometry. 35 of the 47 differentially expressed proteins were successfully identified. Of these proteins, 65.7% were related to carbohydrate and energy metabolism, antioxidant system, transport and metabolism of amino acids and nucleotides. Some olfactory related proteins have been identified for the first time, including peptidoglycan recognition protein-1 (spot16), acyl-coenzyme A dehydrogenase (spot26), phosphoacetone isomerase analogues (spot29), aldehyde-ketone reductase analogues (spot34), serine protease (spot21), etc. Smell binding protein 2 (spot38), acetaldehyde dehydrogenase (spot14), cytochrome P450 (spot12), etc. According to KEGG and Gene Ontology database and software, the differentially expressed proteins were analyzed by bioinformatics, and the identified proteins were classified into 8 categories. Among them, 20.0% of proteins were related to carbohydrate and energy metabolism, 17.1% to antioxidant system, 14.3% to transport, 14.3% to amino acid and nucleotide metabolism. It also included 11.4% cytoskeleton protein and 8.6% protein related to protein folding. Six olfactory related proteins were identified by protein interaction network analysis, including heat shock protein 70 homologues-3, serine protease and aldehyde-ketone reductase analogues, and cytochrome P450, which is abundant in the antennae. Aldehyde dehydrogenase and glutamine synthase create conditions for further study of protein function. The changes of six olfactory related proteins at the transcriptional level were detected by real-time fluorescence quantitative PCR. The results showed that the changes of mRNA and protein levels were basically the same.
【學(xué)位授予單位】:吉林大學(xué)
【學(xué)位級別】:碩士
【學(xué)位授予年份】:2015
【分類號】:S433.5
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