of plasmid miniprep DNA. These cells are recombination-deficient (recA),
ensuring the stability of inserted DNA. With the lacI
qZDM15
gene on the F episome, 96Pack Gold competent cells allow bluewhite
color screening of recombinant plasmids. In addition, this cell strain
is restriction-minus, a feature that increases the efficiency of introducing
eukaryotic DNA into E. coli and increases the size and representation
of libraries constructed with methylated or hemimethylated DNA. Finally,
96Pack Gold cells grow at a fast rate, resulting in the formation of larger,
easier-to-select colonies (
Figure 1).
Superior Performance
We compared the transformation
efficiency of 96Pack Gold cells with MultiShot
cells (Invitrogen) (Figure
2). To test efficiency with supercoiled DNA, we added 1 pg and 10
pg of the pUC plasmid to either 96Pack Gold or MultiShot cells. To test
efficiency for ligated DNA, we transformed 96Pack Gold cells and MultiShot
cells with 2.3 ng of a ligated construct, the pCMV-Script
plasmid with the LacZ gene insert (approximately 4.9 kb). For each
experiment, we followed the manufacturers protocols. As can be seen,
96Pack Gold competent cell transformation efficiency outperformed the
competitors product with both supercoiled and ligated DNA.
Conclusions
Stratagenes
high-efficiency 96Pack Gold competent cells, provided in a high-throughput
format, are the superior choice for PCR cloning, restriction enzyme cloning,
and ligase-independent cloning. In comparison transformations of either
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Page: All 1 2 3 4 Related biology technology :1.
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