![BioVision/Human CellExp™ CD80, human recombinant/7383/](images/biovison/7383_1.jpg)
Alternate Name | CD80, B7, B7-1, B7.1, BB1, CD28LG, CD28LG1, LAB7 |
---|---|
Gene Symbol | CD80 |
Gene ID | 941 |
Accession # | P33681 |
Source | HEK293 cells |
Appearance | Lyophilized |
Physical Form Description | Lyophilized from 0.22 μm filtered solution in PBS, pH7.4. Generally 5-8% Mannitol or trehalose is added as a protectant before lyophilization. |
Molecular Weight | This protein is fused with 6×His tag at the C-terminus, has a calculated MW of 24.7 kDa. The predicted N-terminus is Val 35. DTT-reduced Protein migrates as 45-75 kDa due to different glycosylation. |
Purity by SDS-PAGE | ≥95% |
Endotoxin Level | <1 eu/μg="" by="" lal="">1> |
Biological Activity | Measured by its ability to induce IL2 secretion by Jurkat human acute T cell leukemia cells. The ED50 for this effect is typically 0.01 - 0.1 µg/mL in the presence of phytohaemagglutinin. |
Reconstitution Instructions | Centrifuge the vial prior to opening. Reconstitute in sterile PBS, pH 7.4 to a concentration of 50 µg/ml. Do not vortex. This solution can be stored at 2-8°C for up to 1 month. For extended storage, it is recommended to store at -20°C. |
Handling | Centrifuge the vial prior to opening. |
Storage Conditions | -20°C |
Shipping Conditions | Gel Pack |
USAGE | For Research Use Only! Not to be used in humans |
Description:
B7-1 and B7-2, together with their receptors CD28 and CTLA4, constitute one of the dominant co-stimulatory pathways that regulate T and Bcell responses. Although both CTLA4 and CD28 can bind to the same ligands, CTLA4 binds to B71 and B72 with a 20 100 fold higher affinity than CD28 and is involved in the downregulation of the immune response. B-lymphocyte activation antigen B7-1 (referred to as B7) also known as cluster of Differentiation 80 (CD80), is a member of cell surface immunoglobulin superfamily and is expressed on activated B cells, activated T cells, macrophages and dendritic cells. It is the ligand for two different proteins on the T cell surface: CD28 (for autoregulation and intercellular association) and CTLA-4 (for attenuation of regulation and cellular disassociation). CD80 works in tandem with CD86 to prime T cells. CD80 plays a role in induction of innate immune responses by activating NF-κB-signaling pathway in macrophages. CD80 is thus regarded as promising therapeutic targets for autoimmune diseases and various carcinomas.ebiomall.com
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如果是做科研,国内外很多知名的药企都是你学习借鉴的榜样。
生物制品细胞制备过程中不得使用青霉素或β-内酰胺(β-Lactam)类抗生素,明确表明不准使用青霉素。那么进行的重组蛋白类表达的微生物发酵,可以用青霉素吗?
2、2015版药典三部,各论中指出,”将检定合格的工作种子批菌种接种于适宜培养基(可含适量抗生素)中培养“,”发酵用培养基(采用适宜的不含抗生素的培养基)“。
这里说明种子培养基中可以使用抗生素,而且也没有限定究竟是哪种抗生素。
3、关于发酵中使用的抗生素,不知大家一般用哪家的,一些常用的,氨苄西林钠,硫酸卡那霉素,氯霉素等,都是用的什么级别,那个厂家的呢?我现在生工的,阿拉丁的,生兴生物的都用过。主要还是用的生工生物的,但是生工生物的抗生素都是进口分装的,不仅仅抗生素,国内很多进口分装的试剂,都无法提供相应的产品质量检测证书。而且因为是分装的,基本也就属于只有销售,所以,以后真的生产了,原材料来源的稳定性也无法保证。请问这个问题,大家是怎么解决的,一般用的哪家的呢。
最近留意了几个消息,发现生产线一家比一家大,结合最近国家在搞药品上市许可持有人制度试点,五年以后这行业竞争会有多激烈,产能会不会过剩的。
百迈博生产线6000升(3000*2)
东耀生产线10000升(2000*5)
三生制药生产线30000升(5000*6)
信达生物生产线>15000升
百泰生物生产线4000升
药明康德生产线2000升(不知现在规模有没有扩大)
还有很多低调的公司可能规模更大……
将来在国内,按照现有的产量结合所有生产线的总和生产出来的重组蛋白会不会以白菜价进入市场的,
大家好,想请教大家一个关于HPLC方法学的问题。
目前我们做的一个蛋白药,没有标准品,液相建立一个方法只想用于纯度鉴定,不去定量,这个方法所得到的图谱就一个主蛋白峰,面积归一化法相当于100%,现在就这个方法的方法学验证提出下面几点疑问:
1.因为我只做纯度鉴定,这个方法的方法学应该做系统适用性、专属性、检测限、耐用性和精密度这些,还是按照定量的全套加上定量限、线性、范围、准确度这些?
2.纯度鉴定中,我觉得应该对杂质进行定量,但是我们的这个方法只有一个主蛋白峰,几乎没有杂质峰,这样的话这个方法学我应该以什么为标准证明纯度呢?需将样品进行适当的氧化、酸、碱破坏吗?然后证明破坏后主峰能和产生的杂质分开?
3.对应生物蛋白药的杂质,应该属于无法获得的,如果通过强破坏,这个杂质也是不好鉴定的,是不是我只需要知道主峰能和强破坏的降解物分开,就可以说方法建立成功?还是生物药没有必要做这个强破坏,简单的走一下系统适用性、专属性、检测限、耐用性和精密度这样的流程就行?
说的有点乱,主要是自己对这个生物药的HPLC纯度鉴定的方法学,实在是疑惑重重,希望有经验的大侠能帮忙解答下。非常感谢!
事实上,现在多数药用级别白蛋白都是用血清生产的.
白蛋白的销售方向若是面向实验室,可采用重组质粒转到微生物发酵的方法生产,对土地面积的要求小,更集约,成本效率更高.
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