Pourcel C, Marchal C, Louise A, Fritsch A, Tiollais P
Mol Gen Genet. 1979 Feb 26;170(2):161-9. doi: 10.1007/BF00337792.
Bacteriophage lambda vectors, derived from lambda plac5 were constructed. Their genomes have only one EcoRI restriction site, located near the end of the beta-galactosidase gene. Recombinants, constructed in vitro, having a DNA fragment inserted in the EcoRI site, are lac- and can be easily recognized. Expression of such foreign genes is then under the control of the lac promoter. Mutations Qam73 and Sam7 greatly increase the amount of beta-galactosidase synthesized by the vector bacteriophage. The lambda ZEQS vector has been certified B2 (EK2) by the French control commission "Recombinaisons génétiques in vitro".
构建了源自λplac5的噬菌体λ载体。它们的基因组只有一个EcoRI限制性酶切位点,位于β-半乳糖苷酶基因末端附近。在体外构建的、将DNA片段插入EcoRI位点的重组体是乳糖阴性的,并且易于识别。此类外源基因的表达随后受乳糖启动子的控制。突变Qam73和Sam7极大地增加了载体噬菌体合成的β-半乳糖苷酶的量。λZEQS载体已被法国“体外基因重组”控制委员会认证为B2(EK2)。