ECD 蛋白（Extracellular Domain Proteins，胞外结构域蛋白）是膜蛋白抗体开发中最常用的免疫原与筛选抗原之一。相较于全长膜蛋白，ECD 蛋白在表达、纯化和检测体系兼容性方面更具优势，广泛应用于抗体早期筛选、亲和力评价及功能验证。缔码生物的ECD蛋白主要是针对于单次跨膜蛋白，利用其哺乳动物表达系统已成功表达出1600+高纯度ECD蛋白，覆盖900+靶点。靶点包括GPCR、免疫检查点、肿瘤相关抗原及代谢受体等多个热门可成药靶点。其中，有500+ECD蛋白已成功开发出对应流式抗体。缔码生物所有ECD蛋白产品均经SDS-PAGE纯度验证及ELISA活性，可支持抗体筛选、功能验证及结构研究等多种应用，为膜蛋白药物研发提供高质量研究材料。
ECD 蛋白（Extracellular Domain Proteins）
什么是ECD蛋白？
ECD（Extracellular Domain）蛋白是指膜蛋白位于细胞外侧与外界环境直接接触的结构区域，通常承担配体结合、信号识别、配体结合及细胞间通讯等关键功能。许多重要的受体类药物靶点，如G蛋白偶联受体（GPCR）、受体酪氨酸激酶（RTK）及免疫检查点分子（如PD-1、CTLA-4等），其生物活性主要由胞外域介导。ECD通过特异性识别配体或抗体，不仅参与生理信号传导，还在免疫应答、肿瘤发生及病毒感染等过程中发挥重要作用。
通过去除跨膜结构并优化表达体系，可获得可溶、正确折叠的ECD重组蛋白，既能保留关键抗原表位，又便于ELISA、SPR、流式检测、抗体筛选及结构分析等多种实验应用。随着结构生物学与蛋白工程技术的发展，ECD蛋白已广泛应用于抗体药物发现、受体-配体互作研究以及疫苗设计等领域。
ECD蛋白的应用
- 抗体初筛（Primary Screening）
- 抗体亲和力比较与排序
- 表位分组与机制研究
- ELISA/SPR/BLI方法建立
- 全长膜蛋白或细胞实验前的验证步骤
缔码ECD蛋白优势
- 哺乳动物细胞表达，构象更稳定，筛选更可靠
- 多物种、多片段现货，快速匹配不同研究需求
- 1600+现货ECD蛋白，覆盖900+药物靶点
- 支持流式抗体开发，500+项目实际应用验证
- 适配多种应用场景，加速抗体开发流程
ECD蛋白热门分类
ECD蛋白数据展示
ELISA plate pre-coated by 2 μg/ml (100 μl/well) Human CS1 protein (PME100002) can bind Anti-CS1 Neutralizing antibody BME100002 in a linear range of 7.81-210.7 ng/ml.
ELISA plate pre-coated by 2 μg/ml (100 μl/well) Human BCMA protein (PME100001) can bind Anti-BCMA Neutralizing antibody (BME100016) in a linear range of 3.71-22.29 ng/ml.
Loaded Anti-MUC1 mAb (BME100249) on Pro-A Biosensor, can bind Human MUC1 Protein (PME100106) with an affinity constant of 0.432nM.
Loaded Anti-ACVR2B mAb (BME100228) on Pro-A Biosensor binds Human ACVR2B Protein (PME101717) with an afinity constant of 0.169nM.
HEK293 cell line transfected with irrelevant protein (B) and human B7-2 (A) were surface stained with Human CD28 protein (PME100014) 1μg/ml followed by Alexa 488-conjugated anti-mouse IgG secondary antibody.
HEK293 cell line transfected with irrelevant protein (B) and human GITR Ligand (A) were surface stained with Human GITR protein (PME100019) 1μg/ml followed by Alexa 488-conjugated anti-mouse IgG secondary antibody.
The List of ECD Proteins
100μg 50% 0FF
ECD Proteins
SKU: PME100466 Target: CD200 Tag: C-6×His Tag
Price: 10μg ￥668.00 ; 50μg ￥2499.00 ; 100μg ￥3750.00
ECD Proteins
SKU: PME100070 Target: AXL Tag: C-6×His Tag
Price: 10μg ￥782.00 ; 50μg ￥2866.00 ; 100 μg ￥4299.00
ECD Proteins
SKU: PME100069 Target: FCGR3A Tag: C-6×His Tag
Price: 10μg ￥673.00 ; 50μg ￥2466.00 ; 100 μg ￥3699.00
ECD Proteins
SKU: PME100061 Target: CD52 Tag: C-Mouse Fc Tag
Price: 10μg ￥673.00 ; 50μg ￥2466.00 ; 100 μg ￥3699.00
ECD Proteins
SKU: PME100042 Target: CD70 Tag: N-Mouse Fc and C-6×His Tag
Price: 10μg ￥909.00 ; 50μg ￥3333.00 ; 100 μg ￥4999.00
ECD Proteins
SKU: PME100039 Target: CD33 Tag: C-Human Fc and 6×His Tag
Price: 10μg ￥727.00 ; 50μg ￥2666.00 ; 100 μg ￥3999.00
ECD Proteins
SKU: PME100059 Target: NTB-A Tag: C-Mouse Fc and 6×His Tag
Price: 10μg ￥668.00 ; 50μg ￥2499.00 ; 100μg ￥3750.00
100μg 50% 0FF
ECD Proteins
SKU: PME100469 Target: CD34 Tag: C-6×His Tag
Price: 10μg ￥668.00 ; 50μg ￥2499.00 ; 100μg ￥3750.00
ECD Proteins
SKU: PME100468 Target: IL17RA Tag: C-6×His Tag
Price: 10μg ￥782.00 ; 50μg ￥2866.00 ; 100 μg ￥4299.00
100μg 50% 0FF
ECD Proteins
SKU: PME100465 Target: TNFRSF10B Tag: C-Mouse Fc Tag
Price: 10μg ￥727.00 ; 50μg ￥2666.00 ; 100 μg ￥3999.00
ECD Proteins
SKU: PME100067 Target: CSF1R Tag: C-6×His Tag
Price: 10μg ￥727.00 ; 50μg ￥2666.00 ; 100 μg ￥3999.00
ECD Proteins
SKU: PME100048 Target: BTLA Tag: C-Mouse Fc and 6×His Tag
Price: 10μg ￥909.00 ; 50μg ￥3333.00 ; 100 μg ￥4999.00
ECD Proteins
SKU: PME100068 Target: EPCAM Tag: C-6×His Tag
Price: 10μg ￥668.00 ; 50μg ￥2499.00 ; 100μg ￥3750.00
100μg 50% 0FF
ECD Proteins
SKU: PME100050 Target: DNAM1 Tag: C-Mouse Fc and 6×His Tag
Price: 10μg ￥782.00 ; 50μg ￥2866.00 ; 100 μg ￥4299.00
ECD Proteins
SKU: PME100045 Target: EPHA3 Tag: C-Mouse Fc and 6×His Tag
Price: 10μg ￥782.00 ; 50μg ￥2866.00 ; 100 μg ￥4299.00
100μg 50% 0FF
ECD Proteins
SKU: PME100464 Target: CD7 Tag: C-Mouse Fc Tag
Price: 10μg ￥668.00 ; 50μg ￥2499.00 ; 100μg ￥3750.00
100μg 50% 0FF
ECD Proteins
SKU: PME100463 Target: TweakR Tag: C-Mouse Fc Tag
Price: 10μg ￥727.00 ; 50μg ￥2666.00 ; 100 μg ￥3999.00
ECD Proteins
SKU: PME100462 Target: PD-1 Tag: C-Human Fc and 6×His Tag
Price: 10μg ￥909.00 ; 50μg ￥3333.00 ; 100 μg ￥4999.00
ECD Proteins
SKU: PME100461 Target: PD-1 Tag: C-6×His Tag
Price: 10μg ￥668.00 ; 50μg ￥2499.00 ; 100μg ￥3750.00
ECD Proteins
SKU: PME100460 Target: S protein RBD Tag: C-Mouse Fc and 6×His Tag
Price: 10μg ￥782.00 ; 50μg ￥2866.00 ; 100 μg ￥4299.00
ECD Proteins
SKU: PME100459 Target: Nucleocapsid Tag: N-His Tag
Price: 10μg ￥818.00 ; 50μg ￥2999.00 ; 100 μg ￥4499.00
ECD Proteins
SKU: PME100034 Target: B7-2 Tag: C-Mouse Fc and 6×His Tag
Price: 10μg ￥673.00 ; 50μg ￥2466.00 ; 100 μg ￥3699.00
ECD Proteins
SKU: PME100033 Target: FLT3LG Tag: C-Mouse Fc and 6×His Tag
Price: 10μg ￥818.00 ; 50μg ￥2999.00 ; 100 μg ￥4499.00
100μg 50% 0FF
ECD Proteins
SKU: PME100032 Target: IL6 Tag: C-Mouse Fc and 6×His Tag
Price: 10μg ￥909.00 ; 50μg ￥3333.00 ; 100 μg ￥4999.00
ECD Proteins
SKU: PME100031 Target: Mesothelin Tag: C-Mouse Fc and 6×His Tag
Price: 10μg ￥782.00 ; 50μg ￥2866.00 ; 100 μg ￥4299.00
ECD Proteins
SKU: PME100030 Target: TIM3 Tag: C-Mouse Fc and 6×His Tag
Price: 10μg ￥818.00 ; 50μg ￥2999.00 ; 100 μg ￥4499.00
ECD Proteins
SKU: PME100029 Target: B7-H2 Tag: C-Mouse Fc and 6×His Tag
Price: 10μg ￥818.00 ; 50μg ￥2999.00 ; 100 μg ￥4499.00
ECD Proteins
SKU: PME100028 Target: CD96 Tag: C-Mouse Fc and 6×His Tag
Price: 10μg ￥782.00 ; 50μg ￥2866.00 ; 100 μg ￥4299.00
ECD Proteins
SKU: PME100027 Target: CD155 Tag: C-Mouse Fc and 6×His Tag
Price: 10μg ￥727.00 ; 50μg ￥2666.00 ; 100 μg ￥3999.00
ECD Proteins
SKU: PME100026 Target: ICOS Tag: C-Mouse Fc and 6×His Tag
Price: 10μg ￥854.00 ; 50μg ￥3133.00 ; 100 μg ￥4699.00
100μg 50% 0FF
ECD Proteins
SKU: PME100024 Target: SLAMF1 Tag: C-Mouse Fc and 6×His Tag
Price: 10μg ￥909.00 ; 50μg ￥3333.00 ; 100 μg ￥4999.00
ECD Proteins
SKU: PME100023 Target: PDL1 Tag: C-Mouse Fc and 6×His Tag
Price: 10μg ￥909.00 ; 50μg ￥3333.00 ; 100 μg ￥4999.00
