|Application:||Gene expression microarray analysis|
|Number of samples:||2|
|Release date:||Oct 30 2009|
|Last update date:||Mar 21 2012|
|Chemicals:||Glucose, Succinic Acid|
|Dataset link||High succinic acid tolerance E.coli (DST160)|
A single colony of E. coli W3110 was inoculated into a 15-mL tube containing 4 mL of LB medium. After 12 h cultivation in a shaking incubator at 37℃ and 220 rpm, pre-culture (1 mL) was transferred to a 250 mL-fermentor (Mini-chemostat fermentor; Biotron Inc., Bucheon, Korea) containing 100 mL medium consisted of M9-glucose minimal medium (3 g glucose , 0.8 g NH4Cl, 0.5 g NaCl, 7.5 g Na2HPO4•2H2O, 3 g KH2PO4 with separately added trace elements of 0.2 g MgSO4•7H2O, 0.1 g CaCl2, 1 mg thiamine) per liter supplemented with 254 mmole of succinate (30 g succinic acid) per liter. The initial pH of the medium was set to be pH 7.5 by adding 6N NaOH. The fermentor was operated at 37℃, 350 rpm with air flushing (100 mL/min.). After 12 h batch mode growth, feeding and outlet pumps were turned on at flow rate of 0.167 mL/min (Dilution rate=0.1 h-1). The fresh medium reservoir (10 L) contained the same contents and pH with the initial medium. Every 10 turnover time (100 h), the reservoir was changed with the same medium composition except succinate concentration. The succinate concentration of the reservoir was gradually increased by 25.4 ~ 84.7 mM (3 ~ 10 g/L of succinic acid) at a time than previous states depending on the cell concentrations at the outlet. When the cell concentration was reduced below O.D.=0.2, succinate feeding pump was temporarily stopped to go back to the slightly lower succinate concentration. The continuous culture was performed until the steady state when succinate in the reservoir reached 1.35 M (160 g/L in succinic acid form). The final adapted cells in 100 mL culture were harvested by centrifuge and frozen rapidly in a liquid nitrogen tank for further analyses including DNA microarray. To understand the change of up/down regulations in the high-succinate adapted E. coli, total mRNAs of control cells and the adapted E. coli cells were extracted using a RNA extraction kit (RNeasy mini kit; Quiagen, Hilden, Germany), and the transcriptomes were compared using DNA microarray. Hybridization and washing were accomplished by a facility of Digital Genomics Co (Seoul, Korea). DNA microarray were scanned using an Axon GenePix 4000B Scanner (Axon Instruments, Union City, CA, USA), and the scanned images were analyzed with GenePix Pro 3.0 software to obtain gene expression ratios.