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【Protocol】擬南芥核質(zhì)分離實(shí)驗(yàn)溶液配制: Honda buffer: 25 mM Tris-HCl(pH7.4) 10 mM MgCl2 2.5% (wt/vol) Ficoll 400 5% (wt/vol) Dextran T 40 0.4 M蔗糖 1x Protease Inhibitor Cocktail (用前加) 5 mM DTT (用前加) 10 mM β-巰基乙醇 (用前加) Triton X-100:20% (vol/vol) 試劑及耗材: Triton X-100:#T8787, Sigma, St. Louis, USA 蛋白酶抑制劑(cOmplete Protease Inhibitor Cocktail Tablets): #11836145001, Roche, Mannheim, Germany 二硫蘇糖醇(DL-dithiothreitol, DTT): AMRESCO, Solon, USA Ficoll 400: #F4375,Sigma,St. Louis,USA Dextran T40: #17-0270-01, GE Healthcare, Little Chalfont, England UGPase抗體: #AS05086, Agrisera, Vännäs, Sweden Histone H3抗體: #AS10710, Agrisera, Vännäs, Sweden Miracloth濾布: #475855-1R,Calbiochem, Merck Millipore, Darmstadt, Germany 實(shí)驗(yàn)流程: 1. 稱取2 g 10日齡的擬南芥幼苗于液氮中研磨。 2. 將樣品轉(zhuǎn)移至預(yù)冷的離心管中,并加入4 mL Honda buffer,顛倒混勻后置于冰上10 min,使其充分溶解。 3. 用Miracloth濾布對樣品進(jìn)行過濾。 4. 在濾液中加入終濃度為0.5%的Triton X-100。充分混勻后冰上放置15 min。 5. 取出100 μL樣品作為總蛋白(Total protein)。 6. 4℃,離心1500 g,5 min。轉(zhuǎn)移上清至新管,作為去除了核的細(xì)胞質(zhì)組分蛋白(Nuclei-depleted fraction)。再重復(fù)離心2次,去除沉淀。 7. 沉淀用1 mL添加了0.1% Triton X-100的Honda buffer進(jìn)行清洗,洗5次,1500 g,離心5 min。 8. 沉淀用Honda buffer重懸,50 g,離心1 min,以去除細(xì)胞碎片,細(xì)胞壁及淀粉粒等組分。并將上清轉(zhuǎn)移至新的離心管。 9. 1800 g,離心5 min,收集的沉淀即為核組分(Nuclei-enriched fraction)。將沉淀溶于100 μL Honda buffer中。 10. 將總蛋白、胞質(zhì)組分和核組分進(jìn)行SDS-PAGE電泳及Western blot檢測分離效果。 11. Western blot所用抗體:細(xì)胞質(zhì)組分特異的UGPase抗體(1 : 500稀釋)及核組分特異的Histone H3抗體(1 :5000稀釋)對同時對各組分進(jìn)行檢測。 結(jié)果示例: 引自ref.3 參考文獻(xiàn): 1. Kinkema et al., Nuclear Localization of NPR1 Is Required for Activation ofPRGene Expression, The Plant Cell (2020) 12:2339–235 2.Xia et al., Developmental and hormonal regulation of the Arabidopsis CER2 gene that codes for a nuclear-localized protein required for the normal accumulation of cuticular caxes, Plant Physiology (1997) 115:925-937 3. Long et al., BICELLULAR POLLEN 1 is a modulator of DNA replication and pollen development in Arabidopsis, New Phytologist (2019) 222: 588–603 |