多次跨膜蛋白
多次跨膜蛋白是细胞生长、信号转导及细胞间通讯的重要功能载体,广泛参与机体的各项生理活动,同时也是药物开发的重要靶点。然而,多次跨膜蛋白一直以来存在可溶重组形式的制备难题。恺佧生物拥有完善的VLP和Nanodisc技术平台,实现了多次跨膜蛋白的可溶表达,不仅保持了多次跨膜蛋白正确的结构和构象,且具备优异的生物学活性,可助力多次跨膜蛋白的相关药物研发。
VLP展示多次跨膜蛋白
VLP即Virus Like Particle,是由一种或多种病毒衣壳蛋白自动组装形成的微小纳米颗粒,具有很好的包封分子的能力。VLP展示多次跨膜蛋白是将多次跨膜蛋白展示在VLP表面,不仅维持了多次跨膜蛋白的正确构象,同时具备较强的免疫原性,在抗体发现中具有极大优势。

VLP展示多次跨膜蛋白机理

恺佧生物成功开发出一系列VLP展示的多次跨膜蛋白产品,靶点涵盖Claudin 18.2、GPRC5D、Claudin 6、CD20等多种靶点,突破了此类蛋白制备困难、可溶性低的技术壁垒,且具有更强的免疫原性,产品均经过严格的生物学活性验证,可满足客户不同场景需求。同时,为了实现SPR等更多场景的开发应用,恺佧生物特别开发出定点生物素化的VLP超级蛋白产品,具有高灵敏度、高特异性及高稳定性特点,适合多种分析方法。
产品优势:
全长序列表达,具备天然结构和构象
强免疫原性
可定点引入生物素化
全面的活性验证
产品应用:
动物免疫
抗体淘选
体内药效药代研究
ELISA、SPR等各种分析检测
数据示例
Fig. 1 Immobilized Human Claudin 18.2 VLP at 5 μg/ml (100 μl/Well). Dose response curve for Anti-Claudin 18.2 Antibody, hFc Tag with the EC50 of 9.8 ng/ml determined by ELISA.
Fig. 2 Biotinylated Human Claudin 18.2 VLP captured on CM5 Chip via Streptavidin can bind Anti-Claudin 18.2 Antibody with an affinity constant of 1.28 nM as determined in SPR assay.
Fig. 3 Immobilized Human Claudin 6 VLP at 5 μg/ml (100 μl/Well). Dose response curve for Anti-Claudin 6 Antibody, mFc Tag with the EC50 of 2.5 ng/ml determined by ELISA.
Fig. 4 Biotinylated Human Claudin 6 VLP captured on CM5 Chip via Streptavidin can bind Anti-Claudin 6 Antibody with an affinity constant of 0.65 nM as determined in SPR assay.
Nanodisc展示多次跨膜蛋白
多次跨膜蛋白的结构和功能与其所处的膜环境息息相关,多次跨膜蛋白研究的发展方向之一是开发能够提供更好的细胞膜模拟效果的纯化方法,Nanodisc展示技术应运而生。

Nanodisc展示多次跨膜蛋白示意图

Nanodisc也称纳米圆盘,为一种由磷脂和膜支架分子组成的类膜结构,是用于研究膜蛋白结构和功能的重要工具。它通过模拟天然磷脂双分子层膜环境,为膜蛋白提供了一个稳定的平台,利用Nanodisc展示多次跨膜蛋白不仅可以更好地维持蛋白的天然构象,还可解决多次跨膜蛋白的可溶性制备问题,广泛应用于药物开发的各种分析检测过程。
产品特点
正确的结构和构象
非去垢剂提取,性能更可靠
定量更精准
产品应用
抗体淘选
抗体筛选
检测方法开发(ELISA/SPR/BLI等)
数据示例
恺佧生物开发的Nanodisc展示全长GPRC5D蛋白具有优异的生物学活性和较高的检测灵敏度。
Fig. 5 Immobilized Human GPRC5D Nanodisc, His Tag at 2 μg/ml (100 μl/well) on the plate. Dose response curve for Anti-GPRC5D Antibody, hFc Tag with the EC50 of 4.9 ng/ml determined by
Fig. 6 Human GPRC5D Nanodisc, His Tag captured on CM5 Chip via anti-his antibody can bind Anti-GPRC5D Antibody with an affinity constant of 1.47 nM as determined in SPR assay.
为更大程度助益抗体药物(如双抗药物)开发,恺佧生物特别提供生物素化的Nanodisc展示多次跨膜蛋白,在测评中表现出优异的结合活性,可灵活应用于ELISA方法开发及药代动力学分析等不同研究阶段。
Fig. 7 Immobilized Human CD3E&CD3D, His Tag at 2 μg/ml (100 μl/well) on the plate, add serial dilutions of Anti-Human CD3×GPRC5D Bispecific Antibody, hFc Tag and then add Biotinylated Human GPRC5D Nanodisc, His Tag at 5 μg/ml. Detection was performed using HRP-conjugated streptavidin with the EC50 of 0.28 μg/ml determined by ELISA.
Fig. 8 Loaded Biotinylated Human GPRC5D Nanodisc, His Tag on SA-Biosensor, can bind Anti-GPRC5D Antibody with an affinity constant of 1.16 nM as determined in BLI assay.
多次跨膜蛋白在ADC药物PK分析中的应用
多次跨膜蛋白的ADC药物开发是目前的热门研究方向,在ADC药物的PK分析中,可运用靶蛋白对抗体进行亲和捕获,以分析ADC的总抗体、有效抗体偶联效率等参数,进而反映药物的药效和毒性。除了传统的LBA方法,目前已结合LC-MS等手段实现了更高通量和更高灵敏度的分析,进一步提升了ADC药物的开发效率。

多次跨膜蛋白在ADC药物PK分析中的应用

Fig. 9 Immobilized Human CD3E&CD3D at 5 μg/ml (100 μl/well) on the plate, add serial dilutions of Anti-Human CD3XGPRC5D bispecific antibody in 60% human serum and then add various dilution ratio of biotinylated human GPRC5D VLP. Detection was performed using HRP-conjugated streptavidin with the EC50 of 0.28 μg/ml determined by ELISA. The backcalculation bias is less than 20%, and the sensitivity of the method can reach 6.6 ng/ml.
Fig. 10 lmmobilized Human Claudin 6 VLP at 2 μg/ml (100 μl/well) on the plate. Add serial dilutions of Anti-Claudin 6 Antibody in 60% human serum. Detection was performed using HRP-conjugated goat anti-mouse antibody with the EC50 of 4.5 ng/ml determined by ELISA. The back calculation bias is less than 25%, and the sensitivity of the method can reach 0.7 ng/ml.
货号 蛋白名称 种属 标签 表达系统
CLD-HM0P37 Claudin 18.2 VLP Human N/A HEK293 立即询价
CLD-HM0P38B Biotinylated Claudin 18.2 VLP Human N/A HEK293 立即询价
CLD-HM0P9 FITC-equivalent Claudin 18.2 VLP Human N/A HEK293 立即询价
GPR-HM05P GPRC5D VLP Human N/A HEK293 立即询价
GPR-HM05PB Biotinylated GPRC5D VLP Human N/A HEK293 立即询价
GPR-CM05P GPRC5D VLP Cynomolgus N/A HEK293 立即询价
GPR-MM05P GPRC5D VLP Mouse N/A HEK293 立即询价
CLD-HM006 Claudin 6 VLP Human N/A HEK293 立即询价
CLD-HM006B Biotinylated Claudin 6 VLP Human N/A HEK293 立即询价
CLD-CM006 Claudin 6 VLP Cynomolgus N/A HEK293 立即询价
CLD-MM006 Claudin 6 VLP Mouse N/A HEK293 立即询价
CLD-HM009 Claudin 9 VLP Human N/A HEK293 立即询价
CLD-HM104 Claudin 4 VLP Human N/A HEK293 立即询价
CNR-HM001 Cannabinoid receptor 1 VLP Human N/A HEK293 立即询价
STR-HM002 SSTR2 VLP Human N/A HEK293 立即询价
TSF-HM002 TM4SF1 VLP Human N/A HEK293 立即询价
CD2-HM122 CD20 VLP Human N/A HEK293 立即询价
CCR-HM02B CCR2b VLP Human N/A HEK293 立即询价
CCR-HM02BB Biotinylated CCR2b VLP Human N/A HEK293 立即询价
VLP-HM00C Envelop VLP Control Human N/A HEK293 立即询价
GPR-HM05CB Biotinylated VLP Control Human N/A HEK293 立即询价
GPR-HM15P GPRC5D Nanodisc Human C-His HEK293 立即询价
GPR-HM45PB Biotinylated GPRC5D Nanodisc Human C-His-Avi HEK293 立即询价
CD2-HM1N37 CD20 Nanodisc Human C-His HEK293 立即询价
CCR-HM107 CCR7 Nanodisc Human C-His HEK293 立即询价
A2R-HM1N1 A2AR Nanodisc Human C-His HEK293 立即询价
STR-HM1N1 SSTR2 Nanodisc Human C-His HEK293 立即询价
TSF-HM00N TM4SF1 Nanodisc Human N-His HEK293 立即询价
LGR-HM10N LGR-4 Nanodisc Human C-His HEK293 立即询价
CLD-HM182FB FITC-equivalent Biotinylated Claudin 18.2 VLP Human N/A HEK293 立即询价
CD2-HM0P10B FITC-equivalent Biotinylated Human CD20 VLP Human N/A HEK293 立即询价
SL7-HM0P29 FITC-equivalent Human SLC7A1 VLP Human N/A HEK293 立即询价
CON-HM0P34 FITC-equivalent VLP Control N/A N/A HEK293 立即询价
CLD-HM40NB Biotinylated Claudin 18.2 Nanodisc Human N-His, C-Avi HEK293 立即询价
CLD-HM10N FITC-equivalent Claudin 18.2 Nanodisc Human N-His HEK293 立即询价
CR4-HM1N122 FITC-equivalent CCR4 Nanodisc Human C-His HEK293 立即询价
CD33-HM1N144 CD133 Nanodisc Human C-His HEK293 立即询价