Enhanced plasmid production in miniaturized high-cell-density cultures of Escherichia coli supported with perfluorinated oxygen carrier
Maciej Pilarek , Eva Brand , Friederike Hillig , Mirja Krause , Peter Neubauer
AbstractA simple method for plasmid minipreps in closed 1.5 mL microcentrifuge tubes using a cultivation medium with internal substrate delivery (EnBase®) in combination with a two-phase perfluorodecalin (PFD) system supplying additional oxygen to the E. coli culture is described. The procedure can simply be performed on a thermoshaker using only 50 μL cultivation volume. Twenty and twenty-five percent higher cell densities and plasmid concentration, respectively, were obtained with the additional oxygen delivery system when compared to cultures without PFD. Compared to standard 2 mL LB cultures ninefold higher cell densities and eightfold higher plasmid concentrations were achieved for the smaller culture volume. The μL-scale cultures can be directly utilized in further plasmid purification without any centrifugation step or the subsequent removal of the supernatant. This simplifies the routine procedure considerably. Furthermore, the new method is very robust considering the time of cultivation. Highest plasmid concentrations were already obtained after only 6 h of cultivation, but the plasmid concentration remained high (87 % of the maximum) even until 8 h of cultivation. Aside from the advantage of this method for the daily routine, we believe that it could also be applied to automated high-throughput processes.
|Journal series||Bioprocess and Biosystems Engineering, ISSN 1615-7591|
|Publication size in sheets||0.5|
|ASJC Classification||; ;|
|Score|| = 25.0, 06-08-2020, ArticleFromJournal|
= 30.0, 06-08-2020, ArticleFromJournal
|Publication indicators||= 20; = 20; = 27.0; : 2013 = 1.076; : 2013 = 1.823 (2) - 2013=2.012 (5)|
|Citation count*||27 (2020-09-14)|
* presented citation count is obtained through Internet information analysis and it is close to the number calculated by the Publish or Perish system.