对虾白斑综合症病毒性质和蛋白激酶wsv083的研究
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摘要
对虾白斑综合症病毒(white spot syndrome virus, WSSV)是一种杆状DNA病毒,具有囊膜和被膜,DNA为双链环状。WSSV是目前对虾的最主要的病害,对对虾养殖业造成了巨大危害。所以对WSSV的性质和感染机制等研究对于对虾养殖业意义重大。
     本研究的主要内容如下:
     ①测定WSSV粒子的质量和其基本组成;
     ②探讨微生物在感染了WSSV的螯虾死亡过程中所起的作用;
     ③研究了WSSV囊膜表面的蛋白的种类;
     ④对WSSV的一个蛋白激酶wsv083进行了初步研究。
     结果如下:
     1、通过先计算出WSSV基因组的质量,再测定WSSV的基因组DNA占整个WSSV粒子质量的比例的思路,计算出了一个完整WSSV粒子的质量。进一步测定得到WSSV悬液的每个OD600相当于3.34×108/l的病毒浓度。另外,WSSV各组分在总重量中的比例经测定如下:基因组DNA占10.17%,核衣壳中的蛋白占43.07%,囊膜中的脂类含量约为22%,囊膜中的蛋白质含量约为24.76%;另外还测定了四种主要膜蛋白的相对比例。
     2、为了研究微生物在感染了WSSV的克氏原螯虾(Procambarus clarkii)的死亡过程中的作用,对染毒螯虾注射抗生素,发现其死亡率与对照组相比有明显下降。平板计数结果显示染毒螯虾的血淋巴中微生物数量有明显增加。分析表明主要是嗜水气单胞菌(Aeromonas hydrophila)、弗劳地柠檬酸杆菌(Citrobacter freundii)、嗜麦芽窄食单胞菌(Stenotrophomonasmaltophilia)和琼氏不动杆菌(Acinetobacter junii)等条件致病菌。而抗生素对WSSV的增殖没有显著影响。研究结果表明螯虾在感染了WSSV后血细胞的消失导致体内病原微生物的数量大幅增加,从而加速了螯虾的死亡速度。
     3、利用生物素标记转移技术对牛血清白蛋白(BSA)和凡纳滨对虾的鳃细胞膜蛋白进行标记,研究其与对虾白斑综合症病毒(WSSV)之间的相互作用。发现分子量在50-56KD之间的两种蛋白质位于WSSV的表面,并且与鳃细胞膜蛋白具有特异性的相互作用。根据分子量推测可能是病毒的两种膜蛋白,VP52A和VP56。
     4、把wsv083在大肠杆菌中进行表达和纯化,与纯化的VP28和VP19置于激酶缓冲液中看能否催化磷酸化。研究结果表明wsv083并不具备这个功能。另外还发现wsv083存在苏氨酸和酪氨酸的磷酸化,但没有丝氨酸的磷酸化。而wsv083的突变体则没有磷酸化。结果表明wsv083可以催化自身磷酸化。但其具体功能还需进一步研究。
Shrimp white spot syndrome virus (white spot syndrome virus, WSSV) is arod-shaped DNA virus, with the envelop and the tegument, DNA as double chainring. WSSV is currently the main diseases of prawn aquaculture, caused massiveharm. Therefore, the study on properties and infection mechanism of WSSV is ofgreat significance for prawn aquaculture.
     The main content of this study are as follows:
     ①determination of WSSV particle mass and its basic components;
     ②investigate the role of the microbial infection in the death of crayfishinfected with WSSV;
     ③the identification of the WSSV particle surface protein;
     ④a WSSV protein kinase wsv083were studied.
     The results are as follows:
     First the mass of WSSV genome was calculated, and the proportion of thegenomic DNA accounted for total WSSV particle virus mass was also measured,finally calculate the mass of a complete WSSV particle. The relative proportionsof the major envelop protein were also studied. WSSV suspension for each of theOD600was equivalent to3.34×108/L of the virus concentration.In addition,WSSV components in total weight in proportion through the determination wereas follows: the genomic DNA accounted for10.17%, nucleocapsid protein is43.07%, envelop lipid content is22%, envelop protein content is24.76%.
     To study the role of microorganism in the process of death of theProcambarus clarkia infected with WSSV(white spot syndrome virus), themortality rate of Procambarus clarkia injected with antibiotics decreasedsignificantly compared with the control group. Plate count showed that thehemolymph of Procambarus clarkia infected with WSSV have significantly increased the number of microorganisms. Analysis showed that they wereAeromonas hydrophila, Citrobacter freundii, Stenotrophomonas maltophilia andAcinetobacter junii. All of them were opportunistic pathogen. Antibiotic had nosignificant effect on the WSSV’s proliferation.The results showed that thedisappearance of the blood cells of Procambarus clarkia infected with WSSV invivo led to a substantial increase in the number of pathogenic microorganisms,thereby accelerating the rate of Procambarus clarkia deaths.
     Using the biotin label transfer technique, we found that the biotin label wastransferred from BSA or gill member protein of Litopenaeus vannamei to theenvelop protein of WSSV. Western blotting showed that two proteins whosemolecular weight among50-55KD were labeled with biotin. It was concludedthat the two proteins was location on the surface of the WSSV viron and couldinteract with the gill member protein of Litopenaeus vannamei. They wereestimated to be VP52A and VP56.
     VP28、VP19and wsv083were expressed in E. coli and purified. They wereput in kinase buffer to learn if wsv083can catalyze VP28and VP19’sphosphorylation. Results showed that wsv083cann’t. We also found that therewere threonine and tyrosine phosphorylation but no serine phosphorylation inwsv083. And wsv083mutant was not phosphorylated. It was concluded thatwsv083catalyze autophosphorylation. But its specific function needs furtherstudy.
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