Abstract:
:We have shown previously that a sequence-specific DNA-binding protein based on the Lac repressor protein can isolate pre-purified DNA efficiently from simple buffer solution but our attempts to purify plasmids directly from crude starting materials were disappointing with impractically low DNA yields. We have optimized the procedure and present a simple affinity methodology whereby plasmid DNA is purified directly by mixing two crude cell lysates, one cell lysate containing the plasmid and the other the protein affinity ligand, without the need for treatment by RNaseA. After IMAC chromatography, high purity supercoiled DNA is recovered in good yields of 100-150 microg plasmid per 200 mL shake flask culture. Moreover, the resulting DNA is free from linear or open-circular plasmid DNA, genomic DNA, RNA, and protein, to the limits of our detection. Furthermore, we show that lyophilized affinity ligand can be stored at room temperature and re-hydrated for use when required.
journal_name
Biotechnol Bioengjournal_title
Biotechnology and bioengineeringauthors
Darby RA,Forde GM,Slater NK,Hine AVdoi
10.1002/bit.21492subject
Has Abstractpub_date
2007-12-01 00:00:00pages
1103-8issue
5eissn
0006-3592issn
1097-0290journal_volume
98pub_type
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