[求救] Enzyme digestion 一直切不到但Plasmid PCR有band!!!
因為小妹做這個Cloning已經快5個月了...一直都卡在很奇怪的地方
所以想請版上經驗值豐富的大家的幫個忙~>"<
我想要Clone的gene片段大約是600bp
PCR primer是設計了BamHI & XbaI的切位
我先用PCR產物接到T/A cloning vector(promega跟RBC都試過)
接著transform into DH5-apha還有TOP-10也試過
使用藍白篩選及Amp抗生素
挑白色的菌落做colony PCR 接著增殖有P到約600bp的菌
抽Plamid 取40.5ul的DNA + 5ul buffer 2 + 0.5ul BSA
+ 2ul BamHI + 2ul XbaI
37度 overnight . 3小時跟4小時都試過
可是最後跑膠確認時都沒有切下我想要的band...
應該說除了很亮的Plasmid的band之外都沒有其他的band = =
酵素是用NEB的 而且是新買的
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