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免疫沉淀技術(shù)服務(wù)|實(shí)驗(yàn)技術(shù)服務(wù)

時(shí)間:2015/8/1閱讀:335
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關(guān)鍵詞:免疫沉淀技術(shù)服務(wù)|實(shí)驗(yàn)技術(shù)服務(wù)
簡介:世界*品牌免疫沉淀技術(shù)服務(wù)|實(shí)驗(yàn)技術(shù)服務(wù)原裝,,質(zhì)量保證,*,。
免疫沉淀技術(shù)服務(wù)|實(shí)驗(yàn)技術(shù)服務(wù)——pCzn1質(zhì)粒+Arctic Express宿主菌低溫表達(dá)體系。
我們具備豐富的蛋白表達(dá)設(shè)計(jì)經(jīng)驗(yàn)及實(shí)驗(yàn)操作技巧,,承諾客戶不成功不收費(fèi),。我們所有的實(shí)驗(yàn)數(shù)據(jù)真實(shí)可信,我們提供原始的表達(dá)菌株和克隆質(zhì)粒,,客戶可以依據(jù)我們的實(shí)驗(yàn)報(bào)告重復(fù)我們的實(shí)驗(yàn)結(jié)果,。
產(chǎn)品品牌:   http://www.。,。com/goodsid/fenleiyi/2868603/1.html    
測序?qū)嶒?yàn)流程:
材料
1,,  蛋白A 或蛋白G
2,  一抗
3,,  免疫沉淀緩沖液:20 mM 磷酸鈉, pH 7.5, 500 mM NaCl, 0.1% SDS, 1% NP40, 0.5% 脫氧膽酸鈉 and 0.02% *.
(> NOTE: 50 mM 醋酸鈉緩沖液, pH 5.0,. 500 mM NaCl, 0.1% SDS, 1% NP-40 and 0.02%* 也可作為免疫沉淀的緩沖液,,能提高蛋白G的結(jié)合功效)
4,  洗脫液:0.1 M 甘氨酸-HCl buffer, pH 2.5
5,,  SDS-PAGE 上樣緩沖液 (pH 6.8): 2% SDS, 62.5 mM Tris 堿, 10% 甘油, 2-5% 
實(shí)驗(yàn)流程為:
1.用磷酸鹽緩沖液洗30塊10 cm培養(yǎng)板上的適宜細(xì)胞,。刮去每塊板上的細(xì)胞到1 ml冰冷的EBC裂解緩沖液中。
2.將每毫升細(xì)胞懸液轉(zhuǎn)移到微量離心管中,,在微量離心機(jī)上4℃以zui大速度離心15 min,。
3.收集上清(約30 ml)并加入30μg的適當(dāng)抗體,4℃搖動(dòng)免疫沉淀物1 h,。
4.加入0.9 ml的蛋白質(zhì)A-Sepharose 懸液,,4℃搖動(dòng)免疫沉淀物30 min。
5.用含900 mmol/L NaCl的NETN洗蛋白A-Sepharose混合物,,再重復(fù)洗5次,。zui后,用NETN洗一次,。
6.吸出混合物的液體部分,。加入800μl的1×SDS膠加樣緩沖液到球珠中,煮沸4 min,。
7.將樣品加入到大孔的不連續(xù)SDS-PAGE梯度膠中,,在10 mA的恒定電流下電泳。
8.通過考馬斯藍(lán)染色觀察蛋白質(zhì)泳帶。
9.從膠上切下目標(biāo)帶,,將其放到微量離心管中,,用1ml 50%乙腈洗兩次,每次3 min,。
10. 用胰蛋白酶消化膠中的蛋白質(zhì),,再將肽電洗脫。
11. 通過窄孔液相色譜分離肽,。將收集的肽在ABI 477A或494A機(jī)器上進(jìn)行自動(dòng)Edman降解測序,。
在免疫共沉淀實(shí)驗(yàn)中要保證實(shí)驗(yàn)結(jié)果的真實(shí)性,應(yīng)注意以下幾點(diǎn):
(1) 確保共沉淀的蛋白是由所加入的抗體沉淀得到的,,而并非外源非特異蛋白,,單克隆抗體的使用有助于避免污染的發(fā)生;
(2) 要確??贵w的特異性,,即在不表達(dá)抗原的細(xì)胞溶解物中添加抗體后不會(huì)引起共沉淀;
(3) 確定蛋白間的相互作用是發(fā)生在細(xì)胞中,,而不是由于細(xì)胞的溶解才發(fā)生的,,這需要進(jìn)行蛋白質(zhì)的定位來確定。

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