![ACROBiosystems/Influenza A [A/Guinea fowl/Hong Kong/WF10/99 (H9N2)] Hemagglutinin 1 (HA1) Protein, His Tag/1mg/HA2](images/ACROBiosystems/HA2-V52H8.jpg)
- SynonymHA,Hemagglutinin
- SourceInfluenza A [A/Guinea fowl/Hong Kong/WF10/99 (H9N2)] HA1, His Tag (HA2-V52H8) is expressed from human 293 cells (HEK293). It contains AA Asp 19 - Arg 338 (Accession # Q80KD9).Predicted N-terminus: Asp 19Request for sequence
- Molecular Characterization
This protein carries a polyhistidine tag at the C-terminus.
The protein has a calculated MW of 37.5 kDa. The protein migrates as 50-66 kDa under reducing (R) condition (SDS-PAGE) due to glycosylation.
- EndotoxinLess than 1.0 EU per μg by the LAL method.
- Purity
>95% as determined by SDS-PAGE.
- Formulation
Lyophilized from 0.22 μm filtered solution in PBS, pH7.4. Normally trehalose is added as protectant before lyophilization.
Contact us for customized product form or formulation.
- Reconstitution
Please see Certificate of Analysis for specific instructions.
For best performance, we strongly recommend you to follow the reconstitution protocol provided in the CoA.
- Storage
For long term storage, the product should be stored at lyophilized state at -20°C or lower.
Please avoid repeated freeze-thaw cycles.
This product is stable after storage at:
- -20°C to -70°C for 12 months in lyophilized state;
- -70°C for 3 months under sterile conditions after reconstitution.
![Influenza A [A/Guinea fowl/Hong Kong/WF10/99 (H9N2)] HA1, His Tag (Cat. No. HA2-V52H8) SDS-PAGE gel](images/ACROBiosystems/HA2-V52H8.jpg)
Influenza A [A/Guinea fowl/Hong Kong/WF10/99 (H9N2)] HA1, His Tag on SDS-PAGE under reducing (R) condition. The gel was stained overnight with Coomassie Blue. The purity of the protein is greater than 95%.
- BackgroundNeuraminidase (NA) and hemagglutinin (HA) are major membrane glycoproteins found on the surface of influenza virus. Hemagglutinin binds to the sialic acid-containing receptors on the surface of host cells during initial infection and at the end of an infectious cycle. Hemagglutinin also plays a major role in the determination of host range restriction and virulence. As a class I viral fusion protein, hemagglutinin is responsible for penetration of the virus into the cell cytoplasm by mediating the fusion of the membrane of the endocytosed virus particle with the endosomal membrane.
- References
Please contact us via TechSupport@acrobiosystems.com if you have any question on this product.
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2.准备旋转培养瓶,用于按比例扩增Sf9细胞,将合适大小的两孔盖连接在转瓶的一个 侧臂,另用一平盖接在另一侧臂。将一段短管(约6英寸或15 cm)装在通气孔中,末端连接一滤器,借助张力器用管索将管子与通气孔和滤器固牢。
3.将一段长管(30~60 cm)连接至进气孔,并在末端连接一滤器,用管索加固,另一段管子连接于滤器的另一端,用管索固牢。管子末端用铝箔封好。
4.将与两孔装置相对的侧壁上的盖子旋转90度以松开,高压灭菌培养瓶1 h。
5.将适应了无血清培养液的细胞接种于经高压灭菌的培养瓶中。将培养瓶装至半
而没答案
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考研细胞的题答案
基因重组只是控制同一性状表达不同而已,但是它不会改变性状的基本情况。如:控制眼睛颜色的基因,亲本的基因重组之后可能亲本为黑色,子代便为蓝色。但绝对不会控制眼睛颜色的基因在重组之后就变成控制耳朵的基因。
基因敲除除可中止某一基因的表达外,还包括引入新基因及引入定点突变。既可以是用突变基因或其它基因敲除相应的正常基因,也可以用正常基因敲除相应的突变基因。 基因敲除是80年代后半期应用DNA同源重组原理发展起来的一门新技术。80年代初,胚胎干细胞(ES细胞)分离和体外培养的成功奠定了基因敲除的技术基础。1985年,首次证实的哺乳动物细胞中同源重组的存在奠定了基因敲除的理论基础。到1987年,Thompsson首次建立了完整的ES细胞基因敲除的小鼠模型。此后的几年中,基因敲除技术得到了进一步的发展和完善。
基因敲除的技术路线如下:
(1)构建重组基因载体﹔
(2)用电穿孔、显微注射等方法把重组DNA转入受体细胞核内﹔
(3)用选择培养基筛选已击中的细胞﹔
(4)将击中细胞转入胚胎使其生长成为转基因动物,对转基因动物进行形态观察及分子生物学检测。
基因敲除的靶细胞目前最常用的是小鼠ES细胞。基因敲除的技术路线虽不复杂,但由于高等真核细胞内外源DNA与靶细胞DNA序列自然发生同源重组的机率非常低,约为百万分之一,要把基因敲除成功的细胞筛选出来是一件非常困难的工作。因此,同源重组的筛选和检测就成了基因敲除技术所要解决的关键问题。目前已有多种筛
1. 金开瑞的与传统的蛋白表达系统相比,省略了耗时耗力的质粒转化、细胞培养、收集、破碎和离心等, 极大地提高了工作效率;
2. 反应体系小,能同时平行合成多种不同的蛋白质;
3. 反应周期短,能满足高通量配体筛选和蛋白质组学的科研要求;
4. 开放的反应体系,便于改变各项反应条件,有利于调控基因的转录,蛋白质的合成和翻译后修饰,避免包涵体的形成;
5. 稳定的反应体系,可以偶联其它工艺,形成自动化、程序化、规模化生产,加快重组蛋白的纯化、功能表征和后续的结构解析;
6. 无细胞结构限制,可用于生产对宿主有毒害作用的外源蛋白,避免蛋白表达对宿主细胞的致死作用;
7. 添加非天然氨基酸或同位素标记氨基酸,表达特殊蛋白。
8.对于多次跨膜或由于疏水性强导致的普通细胞系表达困难的项目有显著改善。
定量:考马斯亮蓝显色或紫外分光光度计,就是光谱学的方法。

