Part:pSB6A1:Experience

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This plasmid has been adapted to the version 5 of BioBrick vector backbones by the ETHZ 2011 iGEM team, resulting in pSB6A5. This means, that the cassettes for the ORI and antibiotic resistance have been minimized (reduction of the size and transcriptional terminators flanking the prefix and the suffix have been added, to trancriptionally insulate the inserted parts from the vector backbone machinery and vice versa. This minimization yielded a reduction in size from 4022 bp to 2743 bp. For comparison of the copy number of the plasmids, triplicates of OD normalized bacterial cultures containing the respective plasmids were miniprepped. The DNA concentration was then determined by an agarose DNA gel electrophoresis of EcoRI digests of the purified plasmids (Figure 1). This experiment showed a clear reduction in copy number of the minimized version of the original plasmid (Figure 2). Figure 1: Agarose gel with 2-log-ladder loaded in in lane one, digests of triplicates of the EcoRI digests of pSB6A1 (lane 2-4) and pSB6A5 (lane5-7). Figure 2: Agarose gel with 2-log-ladder loaded in in lane one, digests of triplicates of the EcoRI digests of pSB6A1 (lane 2-4) and pSB6A5 (lane5-7).

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