SDS-PAGE: Coomassie-stained SDS-PAGE showing purified African Swine Fever virus pp62 polyprotein.

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AFRICAN SWINE FEVER VIRUS PP62 POLYPROTEIN, HIS-TAG
African Swine Fever virus pp62 polyprotein is a recombinant protein expressed and purified from mammalian cells. This polyprotein is the precursor for structural proteins p15 and p35 which are essential components of the viral capsid.
PRODUCT DETAILS – AFRICAN SWINE FEVER VIRUS PP62 POLYPROTEIN, HIS-TAG
- Recombinant African Swine Fever virus pp62 polyprotein (NCBI accession number NP_042787.1, aa1-530, strain BA71V).
- Protein contains a C-terminal glycine-serine linker and a His-tag.
- Expressed in HEK293 cells and purified from cell pellets by immobilised metal affinity and ion exchange chromatography.
- Presented in 50mM Tris-HCl pH8.0, 200mM NaCl, sterile filtered.
BACKGROUND
African swine fever (ASF) is a highly contagious haemorrhagic viral disease affecting domestic and wild pigs. It is caused by an enveloped deoxyvirus of the Asfarviridae family that infects domestic and wild pigs as well as soft-bodied ticks of the Ornithodoros genus. Outbreaks have been reported in Africa and parts of Europe, South America, and the Caribbean. More recently (since 2007) the disease has been reported in multiple countries across Africa, Asia and Europe, in both domestic and wild pigs (OIE, 2018). There is currently no approved vaccine for ASFV infection.
African swine fever virus (ASFV) has a double-stranded DNA genome of 170-190 kbp, that encodes more than 150 polypeptides, including pp220, p72, p54, p30, and CD2v. To date, 110 ORFs have been identified and two of those encode the ASFV polyprotein precursors pp220 and pp62 (or pp60). Pp62 has a relative molecular weight of 60.5 kDa and is encoded by the gene CP530R. It can be proteolytically cleaved into the mature virion proteins p35 and p15 by S273R (Alonso et al., 2001). Pp220, pp62, and their mature proteins have important functions in the assembly of virions and viral infection (Jia et al., 2017). Extracellular mature virus particles are composed of a viral core consisting of a central DNA-containing nucleoid, a surrounding core shell, an ER-derived inner lipid envelope, an icosahedral protein capsid, and a plasma membrane derived envelope. Particles are assembled within cytoplasmic viral factories from endoplasmic reticulum-derived viral membranes which become icosahedral particles by the gradual formation of the outer capsid layer. Immunoelectron microscopy showed that pp62 cleavage products reside within the core shell (Suárez et al., 2010). This shell is formed underneath the viral envelope, and subsequently the viral DNA and nucleoproteins are packaged and condensed to form the electron-dense nucleoid. Intracellular mature virions made at the assembly sites are infectious and a fraction of them are transported to the plasma membrane, where they bud, and become infectious extracellular enveloped virions. Processing of polyproteins pp220 and pp62 requires the expression of the major capsid protein p72 and proper processing is an important sign of mature virions. Incomplete processing of pp220 and pp62 results in virus particles without a core or lacking infectiveness (Andrés et al., 2002).
Recombinant insect cell expressed pp62, p32, and p54 antigenicity has been tested in ELISA and immunoblot (IB) for ASF serological diagnosis. Reaction specificity in the IB test were shown to be higher than in ELISA, and the specificities of pp62 and p32 were higher than that of p54 (Gallardo et al., 2006).
The Native Antigen Company is pleased to offer a recombinant pp62 protein which has been manufactured in our state-of-the-art mammalian cell line, ensuring a more native environment for correct processing and stability. This protein is suitable for use in vaccine and diagnostic research and development studies.
REFERENCES
- Alonso et al. (2001). African swine fever virus protein p54 interacts with the microtubular motor complex through direct binding to light-chain dynein. J Virol. 75, 9819–9827.
- Andrés et al. (2002). African Swine Fever Virus Polyproteins pp220 and pp62 Assemble into the Core Shell. J Virol. (24): 12473–12482.
- Gallardo et al. (2006). Antigenic properties and diagnostic potential of African swine fever virus protein pp62 expressed in insect cells. J Clin Microbiol. 44, 950–956.
- Jia et al. (2017). Roles of African swine fever virus structural proteins in viral infection. J Vet Res. 61, 135-143.
- Suárez et al. (2010). African swine fever virus polyprotein pp62 is essential for viral core development. J Virol, 84, 176–187.
- The World Organisation for Animal Health (OIE). African Swine Fever. Oct 2018.
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1、是不是获得SCI文献引用;
2、试剂盒是不是具备高灵敏,质量好的;
3、售后服务完全,提供代测服务;
4、后期实验提供全程技术支持!
今天文章就简单整理了一下最近遇到的问题,有些问题对你来说可能很简单,但是还是会给一些科研菜鸟带去小麻烦,特整理了这么个专场来涨涨姿势。
这里就简单整理了5个问题,具体内容如下:
小编自己在各大论坛看到最多的三个答案:
1)48T可做42个样本加6个标准曲线;96T可做90个样本加6个标准曲线
2)以96T试剂盒来算,定量的试剂盒一般可以做90个左右的样品,定性的试剂盒可以做94个左右的样品
3)96T的ELISA试剂盒,去除标准品复孔检测,最多还能检测80个标本;48T的最多30个样本。
2、elisa试剂盒96T的能做检测多少血清样品?板能重复利用吗?
96T,一般做复孔的话,做标准曲线需要16个孔,剩下80个孔就可以做40个样本。这个板不能重复利用。而且配套的试剂也只是够一块板子用的。
3、想请教一下,我想用elisa法测血清里的一种抗原,查了资料,发现没有现成的试剂盒用,现在就有2种备选方案,一种是买抗体对自己包被(查了R&D等大公司都没有可用于elisa的单抗)。哪种比较好呢?自己包被的会不会比国产的试剂盒可靠呢?
如果你觉得技术不错有队其他公司不放心,可以自己购买抗体对自己包被,这个就是麻烦点,自己包被用着放心,舒心;
另外国内还是有一些资质不错的公司,如北京达科为,上海巧伊,依科赛,深圳欣博盛等等
4、western和ELISA处理样本有何差别?
WesternBlot样品制备要加蛋白裂解液(含有蛋白酶抑制剂),然后冰上研磨,收集于EP管,冰上裂解30min,4度12000rpm离心15min,取上清分装,即得到蛋白样品。建议直接电泳,多余的-80保存。建议分装的蛋白每支略多于一次上样量,一次性用完一支,避免反复冻融。
ELISA样品,直接脑组织冰上匀浆,收集于EP管,同上一样离心,大约220-250ul每支分装(因为ELISA上样量基本都是每孔100ul,做复孔,每个样品2孔,就需要200ul,为了避免不够2孔,分装时要大于200ul每支),直接实验。多余的-80保存,一样避免反复冻融。
不过ELISA最好少量样品进行预实验,或者查阅文献,看看大概组织里有多高浓度,选择合适的试剂盒,测量范围要与组织浓度相符。避免浓度过高测量不准,或者浓度过低,小于试剂盒最低可测浓度。
5、Elisa试剂盒该买哪家公司的呢?
提出这个问题的朋友其实该打,目前国际上各个品牌的试剂盒生厂商,都会有其偏重点,像R&D在细胞因子方面的试剂盒就非常牛逼,而其他牌子也一样的。
Bender:粘附分子方面的试剂盒;
Cayman:花生四烯酸类产品的试剂盒;
Merck(Linco):内分泌研究方面的试剂盒;
Tips:
1、买Elisa试剂盒时,尽量先查文献,通过文献找品牌,再找供应商,找供应商就找正规代理商,千万不要去干“赔夫人又折兵”的蠢事。
2、ELISA中,复孔就是同一个样品加到至少两个孔中(一般3个或4个),最后取其平均值作为样品的读数,这样测得的结果才有说服力!
做复孔是为了较好的较少组内差异,如果血清不足不做复孔也可以。