Alexa Fluor™ 647-Labeled Human CD19 (20-291) Protein, His Tag
分子别名(Synonym)
CD19, B4, CVID3, MGC12802
表达区间及表达系统(Source)
Alexa Fluor 647-Labeled Human CD19 (20-291), His Tag (CD9-HA2H6) is produced via conjugation of AF647 to Human CD19 (20-291), His Tag with a new generation site-specific technology under Star Staining labeling platform. Human CD19 (20-291), His Tag is expressed from human 293 cells (HEK293). It contains AA Pro 20 - Lys 291 (Accession # P15391-1).
蛋白结构(Molecular Characterization)

This protein carries a polyhistidine tag at the C-terminus.
偶联(Conjugate)
AF647
Excitation Wavelength: 640 nm
Emission Wavelength: 672 nm
纯度(Purity)
>95% as determined by SDS-PAGE.
制剂(Formulation)
Lyophilized from 0.22 μm filtered solution in PBS, pH7.4 with trehalose as protectant.
Contact us for customized product form or formulation.
重构方法(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.
存储(Storage)
For long term storage, the product should be stored at lyophilized state at -20°C or lower.
Please protect from light and 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.


背景介绍
B淋巴细胞抗原CD19(亦称分化簇19,Cluster of Differentiation 19)是一种单次跨膜I型膜蛋白,包含两个Ig样C2型(免疫球蛋白样)结构域。该蛋白表达于滤泡树突细胞和B细胞表面,实际上从发育过程中最早可识别的B系细胞到B母细胞阶段持续存在,但在成熟为浆细胞时消失。CD19主要作为B细胞共受体,与CD21和CD81协同作用:激活后其胞质尾部发生磷酸化,导致Src家族激酶结合并招募PI-3激酶。与T细胞类似,B淋巴细胞表面多个分子共同构成抗原受体并形成复合体。(近乎)B细胞特异性的CD19磷酸糖蛋白是其中关键组分,其他成员包括CD21和CD81。这些表面免疫球蛋白(sIg)关联分子共同促进信号转导。在活体B细胞中,模拟外源抗原的抗免疫球蛋白抗体会引发CD19与sIg结合并随之内化。反向过程尚未证实,提示该受体复合物的形成由抗原诱导——这一分子相互作用已通过化学研究得到验证。CD19基因突变会导致以抗体产生缺陷为特征的严重免疫缺陷综合征。研究证实CD19可与CD81、CD82、补体受体2及VAV2发生相互作用。
关键字: CD19;CD19蛋白;CD19重组蛋白;ACRO;百普赛斯;
百普赛斯集团ACROBiosystems Group(股票代码:301080)是成立于2010年的跨国生物科技公司,是为全球生物医药、健康产业领域提供关键生物试剂产品及解决方案的行业平台型基石企业。2021年在创业板上市。百普赛斯集团业务遍布全球,横跨亚洲、北美洲、欧洲,在中国、美国、瑞士等12个城市设有办公室、研发中心及生产基地。目前累计服务客户超6000家,与全球Top 20医药企业均建立了长期、稳定的合作伙伴关系。集团旗下拥有品牌ACROBiosystems百普赛斯、bioSeedin柏思荟、Condense Capital垦拓资本和ACRODiagnostics百斯医学等。