重組金黃色葡萄球菌蛋白A——一種基因工程重組蛋白
品 ?? 名:重組金黃色葡萄球菌蛋白A(Recombinant Staphylococcal Protein A, r-SPA)
規(guī)??? 格:1 mg,10 mg,100 mg,500 mg,特殊訂制
產(chǎn)品形式:冷凍干粉;凍干前緩沖體系為5 mM PB(pH 7.4)
分 子 量:33.6 kDa(SDS-PAGE 約30 kDa)
等 電 點(diǎn):5.10
A280nm(1 mg/mL):0.221?
來??? 源:大腸桿菌
純??? 度:≥95%
保存條件:-20℃保存
有 效 期:3 年

相關(guān)介紹:
??????? 蛋白A是一種金黃色葡萄球菌細(xì)胞壁蛋白質(zhì),能特異性地與很多哺乳動(dòng)物的IgG及少數(shù)IgM和IgA結(jié)合,主要是與免疫球蛋白重鏈的Fc區(qū)結(jié)合。蛋白A可與多種報(bào)告分子(熒光染料、酶標(biāo)記、生物素、膠體金、放射性標(biāo)記等)偶聯(lián)而不影響其與抗體結(jié)合的活性,這些偶聯(lián)反應(yīng)可用于ELISA試驗(yàn)、組織化學(xué)、Western Blot等的抗體檢測(cè)。將蛋白A與瓊脂糖凝膠結(jié)合后還可制備用于抗體純化的親和填料,可從腹水、血清、細(xì)胞培養(yǎng)上清或細(xì)胞抽提物中分離和純化多種哺乳動(dòng)物不同亞型的抗體或包含抗體Fc片段的基因工程重組蛋白。
Protein A is a cell wall protein of Staphylococcus aureus that can specifically bind to many mammalian IgG and a few IgM and IgA, mainly to the Fc region of the immunoglobulin heavy chain. Protein A can couple with various reporter molecules (fluorescent dyes, enzyme labeling, biotin, colloidal gold, radioactive labeling, etc.) without affecting its binding activity with antibodies. These coupling reactions can be used for antibody detection in ELISA tests, histochemistry, Western Blot, etc. Protein A can also be combined with agarose gel to prepare an affinity filler for antibody purification, which can separate and purify antibodies of various mammalian subtypes or genetic engineering recombinant proteins containing antibody Fc fragments from ascites, serum, cell culture supernatant or cell extracts.