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Invitrogen Bac to Bac Expression System

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Product Qualification, continued<br />

MAX Efficiency ®<br />

DH10<strong>Bac</strong> <br />

Chemically<br />

Competent E. coli<br />

1. MAX Efficiency ® DH10<strong>Bac</strong> competent cells are tested for transformation<br />

efficiency using the pUC19 control plasmid included in the kit. Transformed<br />

cultures are plated on LB plates containing 100 µg/ml ampicillin and the<br />

transformation efficiency is calculated. Transformation efficiency should be<br />

greater than 1 x 10 8 cfu/µg pUC19 with non-saturating amounts (50 pg) of<br />

DNA, and greater than 1 x 10 5 cfu/µg pUC19 with saturating amounts<br />

(25 ng) of DNA.<br />

2. DH10<strong>Bac</strong> competent cells are tested for transposition efficiency using 1 ng<br />

of the pFast<strong>Bac</strong> 1-Gus plasmid and following the procedure on page 21.<br />

Transposition frequency should be greater than 8% (% white colonies).<br />

3. Untransformed cells are tested for the appropriate antibiotic sensitivity and<br />

absence of phage contamination.<br />

68

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