The Q5 Site-Directed Mutagenesis Kit (Without Competent Cells) enables rapid,site-specific mutagenesis of double-stranded plasmid DNA in less than 2 hours(Figure 1). The kit utilizes the robust Q5 Hot Start High-Fidelity DNA Polymerasealong with custom mutagenic primers to create insertions, deletionsand substitutions in a wide variety of plasmids. After PCR, the amplified materialis added directly to a unique Kinase-Ligase-DpnI (KLD) enzyme mix for rapid(5 minutes), room temperature circularization and template removal (Figure 2).Transformation into high-efficiency chemically-competent E. coli, not supplied,ensures robust results with plasmids up to at least 20 kb in length.Kit is available with competent cells (NEB #E0554)Figure 1: Site-specific mutagenesis proceeds in less than 2 hours.The use of a master mix, a unique multi-enzyme KLD enzyme mix, and a fast polymerase ensures that, for mostplasmids, the mutagenesis reaction is complete in less than two hours.Figure 2: Q5 Site-Directed Mutagenesis Overview.This kit is designed for rapid and efficient incorporation of insertions, deletions and substitutions into doublestrandedplasmid DNA. The first step is an exponential amplification using standard primers and a master mixfomulation of Q5 Hot Start High-Fidelity DNA Polymerase. The second step involves incubation with a uniqueenzyme mix containing a kinase, a ligase and DpnI. Together, these enzymes allow for rapid circularization of thePCR product and removal of the template DNA. The last step is a high-efficiency transformation into chemicallycompetentcells (not provided).Figure 3: Primer Design for Q5 Site-Directed MutagenesisSubstitutions, deletions and insertions are incorporated into plasmid DNA through the use of specifically designedforward (black) and reverse (red) primers. Unlike kits that rely on linear amplification, primers designedfor the Q5 Site-Directed Mutagenesis Kit should not overlap to ensure that the benefits ofexponential amplification are realized. A) Substitutions are created by incorporating the desired nucleotidechange(s) (denoted by *) in the center of the forward primer, including at least 10 complementary nucleotides onthe 3´side of the mutation(s). The reverse primer is designed so that the 5´ends of the two primers anneal backto-back. B) Deletions are engineered by designing standard, non-mutagenic forward and reverse primers that flankthe region to be deleted. C) Insertions less than or equal to 6 nucleotides are incorporated into the 5´ end of theforward primer while the reverse primer anneals back-to-back with the 5´ end of the complementary region of theforward primer. D) Larger insertions can be created by incorporating half of the desired insertion into the 5´ endsof both primers. The maximum size of the insertion is largely dictated by oligonucleotide synthesis limitations.Figure 4: NEB’s Q5 SDM Kit delivers higher transformation efficiency than Agilent’s QuikChange® SDM KitResults from a substitution reaction (4 nt) using the back-to-back Control SDM Primer Mix and Control SDM Plasmid (6.7 kb) are shown, along with results from a 12 nt deletion experiment (5.8 kb plasmid) and an 18 nt insertion experiment (7.0 kb plasmid). In all three cases, over 90% of the resultant colonies had incorporated the desired mutation(s). Results are normalized to total transformants if cells were not diluted prior to plating. For comparison, the same substitution reaction (4 nt) was performed with the QuikChange Lightning Site-Directed Mutagenesis Kit (Agilent) following Agilent’s protocol and using Agilent’s primer design tool to design overlapping primers.*Note that the QuikChange kit does not accommodate deletions and insertions of this size, so no comparison could be made for these experiments.
This product is related to the following categories:
DNA Assembly, Cloning and Mutagenesis Kits Products
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