. The ligated product was transformed into E. coli BL21 (DE3) pLysS and the positive clones obtained by selection
medium were
further confirmed by PCR and restriction analysis. Transformants were cultured 12 h in LB medium with ampicillin (50 lg/ml) at
37 C. It was subcultured into fresh LB/ampicillin medium, grown several hours at 37 C to an OD590 = 0.4 and then induced using IPTG. Before harvesting, the cells were incubated for 6 h at 37 C. To analyze the induced protein, an equivalent of 1.0 ml of cells was resuspended in 0.1 ml of cracking buffer and heated at
100 C for 5 min immediately prior to loading a 20 ll aliquot of
sample onto an SDS-polyacrylamide gel (Laemmli, 1970) using
10% running and 4% stacking gel. The molecular mass of proteins was determined using higher range protein molecular weight mar- ker (myosin rabbit muscle 205 kDa, phosphorylase b 97.4 kDa, bovine serum albumin 66 kDa, ovalbumin 43 kDa and carbonic anhydrase 29 kDa) obtained from GeNeiTM, Bangalore, India.
. The ligated product was transformed into E. coli BL21 (DE3) pLysS and the positive clones obtained by selectionmedium werefurther confirmed by PCR and restriction analysis. Transformants were cultured 12 h in LB medium with ampicillin (50 lg/ml) at37 C. It was subcultured into fresh LB/ampicillin medium, grown several hours at 37 C to an OD590 = 0.4 and then induced using IPTG. Before harvesting, the cells were incubated for 6 h at 37 C. To analyze the induced protein, an equivalent of 1.0 ml of cells was resuspended in 0.1 ml of cracking buffer and heated at100 C for 5 min immediately prior to loading a 20 ll aliquot ofsample onto an SDS-polyacrylamide gel (Laemmli, 1970) using10% running and 4% stacking gel. The molecular mass of proteins was determined using higher range protein molecular weight mar- ker (myosin rabbit muscle 205 kDa, phosphorylase b 97.4 kDa, bovine serum albumin 66 kDa, ovalbumin 43 kDa and carbonic anhydrase 29 kDa) obtained from GeNeiTM, Bangalore, India.
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