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鸭源新型鹅细小病毒的分离鉴定及VP2蛋白的原核表达

Isolation and identification of a duck-derived Novel goose parvovirus and prokaryotic expression of VP2 protein

  • 摘要: 为了获得鸭源新型鹅细小病毒(NGPV)流行毒株并表达VP2蛋白,试验采集患短喙侏儒综合征的死亡鸭肝脏组织病料样本,首先通过鸭胚传代培养分离病毒,然后对分离毒株进行血凝试验、PCR检测、鸭胚半数致死量(ELD50)测定及致病性试验,最后对VP2蛋白进行诱导表达、可溶性分析、纯化及Western-blot鉴定。结果表明:从临床病料样本中分离到1株病毒,将该毒株接种鸭胚,鸭胚的死亡时间均集中在接种后的第48~72小时之间,死亡鸭胚出现绒毛尿囊膜增厚、胚体有大量出血点、鸭喙短小等短喙侏儒综合征的典型病变特征,将分离毒株命名为SCNC01株。SCNC01株不能凝集1%鸡红细胞,在其基因组DNA中可扩增出NGPV NS1基因序列,该序列与GenBank中的NGPV NS1基因序列相似性在90.6%~98.3%之间,SCNC01株与MK000549、MN415966、JF333590、KC996729、KT598506、MW929338等NGPV毒株处于同一分支,确定该毒株为NGPV。SCNC01株的ELD50为1×10-4.5/0.2 mL,可引起雏鸭出现运动障碍、食欲下降、精神萎靡、喙萎缩、舌头外翻、排白色稀便等临床症状甚至死亡。经IPTG诱导NGPV VP2蛋白获得了表达,且表达形式为包涵体,经His-Tag蛋白纯化柱纯化后,出现与目的蛋白大小一致的单一条带,该蛋白能与NGPV阳性血清特异性结合,具有良好的反应原性。说明试验成功分离到1株鸭源NGPV,并获得了具有良好反应原性的VP2蛋白。

     

    Abstract: In order to obtain a duck-derived Novel goose parvovirus(NGPV) epidemic strain and express the VP2 protein, in the test, liver tissue samples from dead ducks suffering from short-beaked dwarf syndrome were collected; firstly, the virus was isolated from duck embryos by passaging culture; then, erythrocyte agglutination test, PCR detection, determination of the half lethal dose(ELD50) of duck embryos, and pathogenicity test were performed on the virus; finally, the VP2 protein was performed on induced expression, solubility analysis purification, and Western-blot identification. The results showed that a strain of virus was isolated from clinical samples; the death of duck embryos inoculated with this strain was concentrated between the 48th and 72nd hours after inoculation; the dead duck embryos had thickening chorionic villous urothelium, a large number of hemorrhagic spots on the embryo body, and short beaks, which were the typical characteristics of short-beaked dwarf syndrome; and the strain was named as SCNC01 strain. SCNC01 strain was not agglutinative to 1% chicken erythrocytes; the NGPV NS1 gene sequence could be amplified in its genomic DNA, which showed 90.6%-98.3% similarity to the NGPV NS1 gene sequences in GenBank; SCNC01 strain was in the same branch with MK000549, MN415966, JF333590, KC996729, KT598506, MW929338 and other NGPV strains, and this strain was identified as NGPV. The ELD50 of SCNC01 strain was 1×10-4.5/0.2 mL, which could cause ducklings to show clinical symptoms such as movement disorder, decreased appetite, depression, beak atrophy, tongue outward turning, white scanty feces and even death. The VP2 protein was induced by IPTG to obtain the expression, and the expression form was inclusion body; after purification by His-Tag purification column, a single band with the same size as the target protein appeared; the protein could specifically bind to NDV positive serum with good reactogenicity. The results suggested that in the experiment a strain of duck-derived NGPV was successfully isolated and the VP2 protein with good reactogenicity was obtained.

     

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