MaxPlax™ Lambda Packaging Extracts offer maximum in vitro packaging efficiencies of cos site-containing methylated or unmethylated DNA. Traditional lambda packaging extracts are derived from two complementary lysogenic E. coli strains, BHB2690 and BHB2688, as described by Hohn.1 MaxPlax Extracts use a restriction-free E. coli K-12 strain, NM759, in place of strain BHB2690.2 The sonicated extracts of NM759 are combined with extracts of BHB2688 to produce MaxPlax Extracts.
Each lot of MaxPlax Extracts is tested and guaranteed to maintain a packaging efficiency of greater than 1 × 109 pfu/µg of Control Ligated Lambda DNA for 1 year from the date of purchase if stored properly. A Certificate of Analysis stating actual packaging efficiency (pfu/µg DNA) is provided with each lot of MaxPlax Extracts.
|Table 1. Packaging of methylated and unmethylated DNA using MaxPlax™ Lambda Packaging Extracts.|
|Cosmid Insert||Pfu/µg DNA|
|Unmethylated DNA||3.5 x 107|
|Methylated DNA||3.9 x 107|