Human Fc gamma RIIIA/CD16a (V176F)組換え体(リコンビナント)タンパク質 | Recombinant Human Fc gamma RIIIA/CD16a (V176F)

R&D Systems社製の高品質なHuman Fc gamma RIIIA/CD16a (V176F)の組換え体タンパク質(Recombinant Human Fc gamma RIIIA/CD16a (V176F))です。

※本製品は研究用です。研究用以外には使用できません。

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R&D Systems社組換え体タンパク質製品では通常ウシ血清アルブミン(BSA)をキャリアタンパク質として加えています。キャリアタンパク質を加えることで組換え体タンパク質の安定性が高まり、使用期限が長くなります。また、より濃度の低い溶液での保管も可能となります。CF製品はBSAが含まれない製品となります。一般的に細胞培養や、ELISAのスタンダードにはBSA含有製品を推奨しています。CF製品はBSAが影響してしまうアプリケーションに推奨されます。

Fc gamma  RIIIA/CD16a is a low/intermediate affinity receptor for polyvalent immune-complexed IgG. It is involved in phagocytosis, secretion of enzymes and inflammatory mediators, antibody-dependent cytotoxicity, and clearance of immune complexes (1-3). In humans, it is expressed as a 50-70 kDa transmembrane activating receptor on NK cells, T cells, monocytes, and macrophages (2). It is closely related to the GPI-linked Fc gamma RIIIB which is expressed on human neutrophils and eosinophils (1, 3). These two proteins share 97% amino acid (aa) identity within their extracellular domains (ECD) (4). The ECD of Fc gamma RIIIA also shares 63%, 61%, 65%, 59%, and 58% aa identity with mouse Fc gamma RIV, rat Fc gamma RIIIA, feline CD16, bovine CD16, and porcine Fc gamma RIIIB, respectively. Mature human Fc gamma RIIIA consists of a 192 aa ECD with two C2-type Ig-like domains, a 21 aa transmembrane segment, and a 25 aa cytoplasmic domain. In humans, a single nucleotide polymorphism (T230A) creates high binding (176V) and low binding (176F) forms that may influence susceptibility to autoimmune diseases or response to therapeutic IgG antibodies (5, 6). Fc gamma RIIIA surface expression requires interaction with an accessory chain, either the common gamma -chain or CD3 zeta (7, 8). Glycosylation patterns, electrophoretic mobility, and binding affinity appear to differ between NK cell and monocyte Fc gamma RIIIA (9). Shed forms of both Fc gamma RIIIA and Fc gamma RIIIB can be generated by proteolytic cleavage and retain binding activity (10-13). Shedding from monocytes and macrophages can be triggered by cell activation or phagocytosis (13). Soluble Fc gamma RIII circulates in normal plasma and is elevated in rheumatoid arthritis and in coronary artery diseases (11, 12).