B2M/Beta-2-microglobulin 蛋白, Human (99a.a, HEK293, His)

B2M is a component of MHC class I complexes that present peptide antigens to the immune system. B2M/Beta-2-microglobulin Protein, Human (99a.a, HEK293, His) is the recombinant human-derived B2M/Beta-2-microglobulin protein, expressed by HEK293 , with C-6*His labeled tag. The total length of B2M/Beta-2-microglobulin Protein, Human (99a.a, HEK293, His) is 99 a.a., with molecular weight of ~14.0 kDa.

B2M（或 Beta-2-微球蛋白）是 I 类主要组织相容性复合体 (MHC) 的重要组成部分，在向免疫系统呈递肽抗原方面发挥着核心作用。值得注意的是，外源应用的结核分枝杆菌 EsxA 或 EsxA-EsxB 会结合 B2M 并减少其向细胞表面的输出，可能导致 I 类抗原呈递缺陷。B2M 以异二聚体形式存在，由 α 链和 β 链组成，后者作为主要组织相容性复合物 I 类分子的 β 链。在长期血液透析患者的组织中观察到了 B2M 聚合物。B2M 以其分离形式与结核分枝杆菌 EsxA 和 EsxA-EsxB 复合物相互作用，形成可在宿主内质网中检测到的三联复合物。B2M-EsxA 复合物的稳定性可在较宽的 pH 范围内以及高盐浓度的情况下保持。此外，B2M 与 HLA-E、HLA-G 和 HLA-F 以及自身肽或外源肽形成异三聚体，有助于主要组织相容性复合物的多种功能。此外，B2M 与 MR1 形成异源三聚体复合物，在与代谢抗原相关的抗原呈递中发挥作用。

Human

HEK293

C-6*His

P61769 (I21-M119)

567  [NCBI]

IQRTPKIQVYSRHPAENGKSNFLNCYVSGFHPSDIEVDLLKNGERIEKVEHSDLSFSKDWSFYLLYYTEFTPTEKDEYACRVNHVTLSQPKIVKWDRDM

Approximately 14.0 kDa

Greater than 95% as determined by reducing SDS-PAGE

无菌粉末.

Lyophilized from a 0.2 μm filtered solution of 20 mM PB, 150 mM NaCl, pH 7.2.

<1 EU/μg, determined by LAL method.

It is not recommended to reconstitute to a concentration less than 100 μg/mL in ddH₂O. For long term storage it is recommended to add a carrier protein (0.1% BSA, 5% HSA, 10% FBS or 5% Trehalose).

Stored at -20°C for 2 years. After reconstitution, it is stable at 4°C for 1 week or -20°C for longer (with carrier protein). It is recommended to freeze aliquots at -20°C or -80°C for extended storage.

Room temperature in continental US; may vary elsewhere.