4084198
Common laboratory strain used for recombinant protein expression.
<P><b><i>Escherichia coli</i> BL21-Gold(DE3)pLysS AG.</B>BL21-Gold(DE3)pLysS AG is a derivative of <i>E. coli</i> strain B. Deficiency in Lon and OmpT proteases makes it a superior host for recombinant protein expression. It also carries a DE3 recombinant phage harboring the T7 RNA polymerase gene that can direct high-level expression of cloned genes under the control of the T7 promoter.