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采用RT-PCR和RACE技术,从孟氏隐唇瓢虫Cryptolaemus montrouzieri Mulsant中成功克隆出气味结合蛋白(Com OBP1)基因的全序列(Genbank登陆号:KU170686)。Com OBP1基因全长922 bp,包括5'端长为40 bp的非编码区域(UTR),及3'端长为462 bp的UTR,开放阅读框ORF长为420 bp,编码139个氨基酸,预测的分子量为15.516 k Da,等电点p I为6.57,存在AATAAA加尾信号。N-末端疏水区包含由20个氨基酸构成的信号肽,无跨膜结构,有4个保守的半胱氨酸,属于Minus-C OBP,也是在孟氏隐唇瓢虫中发现的第一个Minus-C OBP。氨基酸序列中有且仅有一个N-糖基化位点为62 NLSA,并存在2个潜在的磷酸化位点。与其它昆虫的Minus-C OBPs进行同源性比较并构建系统发育树,发现与同为鞘翅目Coleoptera昆虫的同源性较高。利用Real-time PCR、RT-PCR技术对Cmon OBP1基因在孟氏隐唇瓢虫不同发育阶段,不同组织,不同营养条件及不同食性下的表达水平进行了测定,结果显示,Cmon OBP1基因在整个发育阶段均有表达,雄性成虫期具有最高表达量,且多在成虫的头部及翅部表达。当营养条件发生变化时,表达丰度不会发生变化,当猎物由天然猎物柑橘粉蚧Planococcus citri Risso变成碗豆修尾蚜Megoura japonica Matsumura时,表达量会明显下降。该结果表明,孟氏隐唇瓢虫的不同发育阶段、不同组织及猎物种类会影响Cmon OBP1基因的表达,从而进一步影响其嗅觉行为。同时,Cmon OBP1基因可能在雄虫相关的信息素感受过程中发挥着重要作用。 相似文献
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《环境昆虫学报》2013,35(4):479-485
本文使用场发射扫描电子显微镜对孟氏隐唇瓢虫Cryptolaemus montrouzieri Mulsant雌雄成虫的触角和触角感受器进行了观察和研究,并对触角形态,感受器形态、类型、数量及分布进行了统计和分析。孟氏隐唇瓢虫雌雄成虫触角均由柄节,梗节及8个鞭小节组成。观察到7种触角感受器:四种锥形感受器(sba),四种刺形感受器(sch),四种毛形感受器(str),一种腔锥形感受器(sco),一种耳形感受器(sau),一种腔形感受器(scl),一种Bhm氏鬃毛(sbm)。毛形感受器和刺形感受器数量最多,其他类型感受器数量都较少。Bhm氏鬃毛只存在于柄节和梗节。第八鞭小节的顶端感受器种类最丰富,被六种感受器稠密覆盖。雌雄触角大小、感受器类型都没有明显差异。根据感受器的分布和以前的相关报道,推测孟氏隐唇瓢虫的毛形感受器可能是信息素接收者,刺形感受器可能是机械性刺激感受器和化学感受器,锥形感受器和腔锥形感受器可能都是植物挥发物接受者,化学和温湿度感受器,耳形感受器或许承担物理或者嗅觉器官的功能,而Bhm氏鬃毛或许能感知触角的位置和活动。 相似文献
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本文克隆了东亚飞蝗Locusta migratoria manilensis(Meyen)细胞色素P450(cytochrome P450)基因全长,表达重组蛋白,并对其可溶性进行了分析。通过提取东亚飞蝗总的RNA,反转录成cDNA,设计特异性引物,PCR克隆东亚飞蝗细胞色素P450基因,将测序正确的目的片段克隆至原核表达载体pET-28a中,在大肠埃希菌Escherichia coli Rosetta中用异丙基-β-D-硫代半乳糖苷(IPTG)诱导表达。用十二烷基硫酸钠-聚丙烯酰胺凝胶电泳(SDS-PAGE)检测重组蛋白表达结果。结果表明:东亚飞蝗细胞色素P450基因开放阅读框全长为1 551 bp,编码516个氨基酸,与GenBank中已登录的东亚飞蝗细胞色素P450基因(HM153426)的同源性为99%,重组质粒pET-28a-P450在E.coli Rosetta中获得高效表达,重组蛋白相对分子质量(Mr)约为53 000,主要以包涵体的形式存在。 相似文献
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【目的】孟氏隐唇瓢虫Cryptolaemus montrouzieri Mulsant生殖系统结构和卵细胞发生将为昆虫的系统进化关系及瓢虫分类提供依据,同时可作为瓢虫人工饲料研究开发的参考。【方法】利用组织石蜡切片技术和光学显微镜,观察孟氏隐唇瓢虫生殖系统结构,以及自成虫羽化后不同发育阶段卵巢发育状况和成熟卵巢管卵子发生过程。【结果】孟氏隐唇瓢虫雄性生殖系统包括2对附腺、1对精巢、1对输精管、1对贮精囊、射精管、弯管和阳基。雌性生殖系统包括2片生殖板、生殖腔、受精囊、中输卵管、1对侧输卵管和1对卵巢。单侧卵巢管数量在11~14根之间,卵巢管端部延伸出细长的端丝。卵巢管属于端滋式,分为原卵区和生长区。滋养细胞分散且细胞核几乎充满整个细胞,未见合胞体。卵细胞稀疏地集中在原卵区下端,并且可见营养索向卵巢管顶端延伸。根据卵细胞位置和形态,卵黄积累情况,滤泡细胞形态变化,将卵细胞发生分为前期,中期,中后期和后期。卵细胞发育后期,营养索消失,滤泡细胞排列疏松,细胞间隙增大。【结论】孟氏隐唇瓢虫卵巢管的滋养细胞是端滋式卵巢管滋养细胞中的原始类型,且推测瓢虫科昆虫卵巢管滋养细胞均属于此类。卵细胞早期发育过程中,卵细胞通过营养索从滋养细胞获取营养物质。 相似文献
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孟氏隐唇瓢虫和台毛艳瓢虫对茶椰圆蚧的捕食作用 总被引:3,自引:0,他引:3
本首次报道,孟氏隐唇瓢虫和志艳瓢虫是茶椰圆蚧的重要捕食性天敌。1998-1999年我们研究了这两种瓢虫的生活习性及其对茶椰圆蚧二龄若虫的捕食作用。这两种瓢虫成6虫对共椰圆蚧二龄若虫的功能反应均可用HollingⅡ型模型模拟。孟氏隐唇瓢虫的模型参数为:α'=1.1302,Th=0.0093,maxNa=107.6233;台毛艳主虫的模型参数为:α'=1.0005,Th=0.0126,maxNa=79.3741。温度对孟氏隐唇瓢虫捕食作用的影响大于对台毛艳瓢虫的影响,个体间相互干扰对捕食作用的影响,孟氏隐唇瓢虫大于台毛艳瓢虫孟氏隐唇瓢虫干扰反应模拟模型参数为:Q=0.4045,m=0.4359;台毛艳瓢虫干扰反应模拟模型参数为:0.3335m=0.4042。 相似文献
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选择合适的内参基因是qRT-PCR研究的关键。本文以孟氏隐唇瓢虫Cryptolaemus montrouzieri Mulsant为研究材料,利用qRT-PCR技术,对孟氏隐唇瓢虫4个候选内参基因Actin、RPS23、GAPDH和β-tubulin的mRNA的表达量进行了分析,并用Ge Norm、Norm Finder和Best Keeper软件分析它们在孟氏隐唇瓢虫不同发育阶段及成虫不同组织中的表达稳定性。结果表明,以成虫不同组织为材料时,综合三种软件分析结果显示4个候选基因表达稳定性平均等级值排名为RPS23(rank=1)β-tubulin(rank=2.3)GAPDH(rank=3)Actin(rank=3.7),以不同发育时期虫体为材料时,综合分析结果显示4个候选内参基因表达稳定性平均等级值排名为RPS23(rank=1.7)Actin(rank=2)GAPDH(rank=2.7)β-tubulin(rank=3.7)。综合分析在瓢虫不同发育阶段及成虫不同组织两种处理下,三种软件的评价效果,4个候选基因表达稳定性等级值的总平均排名为RPS23(rank=1.3)Actin(rank=2.8)=GAPDH(rank=2.8)β-tubulin(rank=3)。RPS23在瓢虫不同发育阶段及成虫不同组织中均显示出较高的表达稳定性及与其它基因之间极大的相关性,可以确定为孟氏隐唇虫不同发育阶段及成虫不同组织基因表达分析中一个稳定表达的基因,可作为单个内参基因或者其它内参基因的协同基因,本实验为开展孟氏隐唇瓢虫功能基因表达分析奠定了方法学基础。 相似文献
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The analysis of a non-redundant set of human proteins, for which both the crystallographic structures and the corresponding gene sequences are available, show that bases at third codon position are non-uniformly distributed along the coding sequences. Significant compositional differences are found by comparing the gene regions corresponding to the different secondary structures of the proteins. Inter-and intra-structure differences were most pronounced in the GC-richest genes. These results are not compatible with any proposed hypotheses based on a neutral process of formation/maintenance of the high GC3 levels of the genes localized in the GC-richest isochores of the human genome. 相似文献
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Candida bombicola is a yeast with at least two appealing features. The species can grow on alkanes when provided as the sole carbon source, and it produces glycolipids, which have several industrial, cosmetic and pharmaceutical applications. Both metabolic processes require in their pathway the activity of cytochrome P450 monooxygenase. This enzyme needs and gets reducing equivalents from NADPH cytochrome P450 reductase (CPR). The CPR gene of Candida bombicola was isolated using degenerate PCR and genomic walking. The gene encodes an enzyme of 687 amino acids, which shows homology with known CPRs of other species. The functionality of the gene was proven by heterologous expression in Escherichia coli. The recombinant protein exhibited NADPH-dependent cytochrome c reducing activity. Cloning and characterization of this enzyme is an important step in the study of the cytochrome P450 monooxygenase system of Candida bombicola. The GenBank accession number of the sequence described in this article is EF050789. 相似文献
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Cloning and overexpression of CYP6F1, a cytochrome P450 gene, from deltamethrin-resistant Culex pipiens pallens 总被引:4,自引:0,他引:4
Gong MQ Gu Y Hu XB Sun Y Ma L Li XL Sun LX Sun J Qian J Zhu CL 《Acta biochimica et biophysica Sinica》2005,37(5):317-326
CYP6F1 (GenBank/EMBL accession No. AY662654), a novel gene with a complete encoding sequence in the cytochrome P450 family 6, was cloned and sequenced from deltamethrin-resistant 4th instar larvae of Culex pipiens pallens. The cDNA sequence of CYP6F1 has an open reading frame of 1527 bp, which encodes a putative protein of 508 amino acid residues. The deduced amino acid sequence of CYP6F1 indicated that the encoded P450 has conserved domains of a putative membrane-anchoring signal,putative reductase-binding sites, a typical heme-binding site, an ETLR motif and substrate recognition sites.Semi-quantitative RT-PCR analysis indicated that the CYP6F1 gene was expressed to a greater extent in the deltamethrin-resistant strain than in the susceptible strain of Cx. pipiens pallens. The expression levels of the CYP6F1 gene in the deltamethrin-resistant 1 st, 2nd, 3rd, 4th instar larvae and adult female mosquitoes differed, with highest expression levels in the 4th instar larvae. In addition, the CYP6F1 gene was stably expressed in mosquito C6/36 cells, and the expected 61.2 kDa band was identified by Western blotting. The cells transfected with CYP6F1 had an increased resistance to deltamethrin as compared with control cells.These results indicate that CYP6F1 is expressed at higher levels in the deltamethrin-resistant strain, and may confer some insecticide resistance in Cx. pipiens pallens. 相似文献
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P. D. Kamala Jayanthi R. Rajinikanth K. V. Ravishankar P. Sangeetha Abraham Verghese D. Lokeshwari 《Journal of Insect Behavior》2014,27(3):385-394
The cyclic guanomonophosphate (cGMP) dependent protein kinase (PKG) plays an important role in the food related behaviours of several insect species. Here we report the influence of cGMP dependent PKG on prey consumption of adult predatory coccinellid, Cryptolaemus montrouzieri Mulsant (Coleoptera: Coccinellidae). The oral cGMP treatment (which increases PKG activity) enhanced the feeding potential of C. montrouzieri. The good foragers responded more positively to the cGMP treatment compared to the poor foragers. The cGMP levels estimated through ELISA were significantly (P?<?0.001) high in the digestive tissues of unfed as well as cGMP treated C. montrouzieri compared to normal fed beetles. This finding suggests that cGMP is involved in the higher feeding rates of C. montrouzieri and the partial foraging gene (~455 bp) which encodes the cGMP dependent PKG was isolated from genomic DNA of C. montrouzieri using gene specific primers. 相似文献
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Expression,purification and spectroscopic characterization of the cytochrome P450 CYP121 from Mycobacterium tuberculosis 总被引:1,自引:0,他引:1
McLean KJ Cheesman MR Rivers SL Richmond A Leys D Chapman SK Reid GA Price NC Kelly SM Clarkson J Smith WE Munro AW 《Journal of inorganic biochemistry》2002,91(4):527-541
The CYP121 gene from the pathogenic bacterium Mycobacterium tuberculosis has been cloned and expressed in Escherichia coli, and the protein purified to homogeneity by ion exchange and hydrophobic interaction chromatography. The CYP121 gene encodes a cytochrome P450 enzyme (CYP121) that displays typical electronic absorption features for a member of this superfamily of hemoproteins (major Soret absorption band at 416.5 nm with alpha and beta bands at 565 and 538 nm, respectively, in the oxidized form) and which binds carbon monoxide to give the characteristic Soret band shift to 448 nm. Resonance Raman, EPR and MCD spectra show the protein to be predominantly low-spin and to have a typical cysteinate- and water-ligated b-type heme iron. CD spectra in the far UV region describe a mainly alpha helical conformation, but the visible CD spectrum shows a band of positive sign in the Soret region, distinct from spectra for other P450s recognized thus far. CYP121 binds very tightly to a range of azole antifungal drugs (e.g. clotrimazole, miconazole), suggesting that it may represent a novel target for these antibiotics in the M. tuberculosis pathogen. 相似文献