[求救] cloning已經做了5個月...
我一共有四個gene要clone
用的plasmid是pET20b
RE site用 NdeI 跟 XhoI
在primer設計上 已經把RE site加進去 且在RE site前面多加兩個G
但一直沒辦法把insert接進去
後來改用TA cloning(但最後還是要把gene放到pET20b裡...)
將PCR product clean up後
直接用基龍米克斯的TA cloning kit
將PCR product跟TA vector進行ligation
transformation後 做藍白篩
有clone到其中一個gene
但 藍白篩的偽陽性很高 我挑六顆白色的菌 卻只有一個有我要的insert
其它都只有TA vector
另外 我想問
自製的competent cell 要怎樣做才堪用阿?
我做了兩三次的competent cell 但是前兩次的都不能用
transform完跟本不會長菌
第三次做的competent cell時長時不長...
還有 到底怎樣做cloning成功的機會比較高阿?
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