保护碱基

我的经验：其实，对于常用的一些很好使的内切酶，如HindIII、BamHI、SacI等，保护碱基[size=1em]可以任意选择。此时，可以考虑使用与模板上对应序列配对的一个或者几个碱基作为保护碱基。如果两条引物的GC含量和Tm值相差较大，还可以通过调整保护碱基来使之接近。下面是NEB公司网站提供的保护碱基参考。|A|B|C|E|H|K|M|N|P|S|X|EnzymeOligoSequenceChainLength%Cleavage2hr20hrAccIGGTCGACCCGGTCGACCGCCGGTCGACCGG81012000000AflIIICACATGTGCCACATGTGGCCCACATGTGGG810120909009090AscIGGCGCGCCAGGCGCGCCTTTGGCGCGCCAA81012909090909090AvaICCCCGGGGCCCCCGGGGGTCCCCCGGGGGA81012509090909090BamHICGGATCCGCGGGATCCCGCGCGGATCCGCG81012109090259090BglIICAGATCTGGAAGATCTTCGGAAGATCTTCC810120752509090BssHIIGGCGCGCCAGGCGCGCCTTTGGCGCGCCAA8101200500090BstEIIGGGT(A/T)ACCC9010BstXIAACTGCAGAACCAATGCATTGGAAAACTGCAGCCAATGCATTGGAACTGCAGAACCAATGCATTGGATGCAT2224270252505090ClaICATCGATGGATCGATCCCATCGATGGCCCATCGATGGG881012009050009050EcoRIGGAATTCCCGGAATTCCGCCGGAATTCCGG81012909090909090HaeIIIGGGGCCCCAGCGGCCGCTTTGCGGCCGCAA81012909090909090HindIIICAAGCTTG800CCAAGCTTGGCCCAAGCTTGGG1012010075KpnIGGGTACCCGGGGTACCCCCGGGGTACCCCG810120909009090MluIGACGCGTCCGACGCGTCG810025050NcoICCCATGGGCATGCCATGGCATG814050075NdeICCATATGGCCCATATGGGCGCCATATGGCGGGGTTTCATATGAAACCCGGAATTCCATATGGAATTCCGGGAATTCCATATGGAATTCCC810121820220000757500009090NheIGGCTAGCCCGGCTAGCCGCTAGCTAGCTAG810120101002550NotITTGCGGCCGCAAATTTGCGGCCGCTTTAAAATATGCGGCCGCTATAAAATAAGAATGCGGCCGCTAAACTATAAGGAAAAAAGCGGCCGCAAAAGGAAAA1216202428010102525010109090NsiITGCATGCATGCACCAATGCATTGGTTCTGCAGTT122210909090PacITTAATTAAGTTAATTAACCCTTAATTAAGG8101200002590PmeIGTTTAAACGGTTTAAACCGGGTTTAAACCCAGCTTTGTTTAAACGGCGCGCCGG8101224000750255090PstIGCTGCAGCTGCACTGCAGTGCAAACTGCAGAACCAATGCATTGGAAAACTGCAGCCAATGCATTGGAACTGCAGAACCAATGCATTGGATGCAT8142224260109090001090900PvuICCGATCGGATCGATCGATTCGCGATCGCGA81012010002510SacICGAGCTCG81010SacIIGCCGCGGCTCCCCGCGGGGA812050090SalIGTCGACGTCAAAAGGCCATAGCGGCCGC2800GCGTCGACGTCTTGGCCATAGCGGCCGCGGACGCGTCGACGTCGGCCATAGCGGCCGCGGAA303210105075ScaIGAGTACTCAAAAGTACTTTT81210752575SmaICCCGGGCCCCGGGGCCCCCGGGGGTCCCCCGGGGGA68101200109010105090SpeIGACTAGTCGGACTAGTCCCGGACTAGTCCGCTAGACTAGTCTAG810121410100090905050SphIGGCATGCCCATGCATGCATGACATGCATGCATGT81214001002550StuIAAGGCCTTGAAGGCCTTCAAAAGGCCTTTT81012909090909090XbaICTCTAGAGGCTCTAGAGCTGCTCTAGAGCACTAGTCTAGACTAG810121409075750909090XhoICCTCGAGGCCCTCGAGGGCCGCTCGAGCGG810120101002575XmaICCCCGGGGCCCCCGGGGGCCCCCCGGGGGGTCCCCCCGGGGGGA810121402550900759090