[Effectiveness of the promoter Ptac' in vitro and in mini-cells].

The efficiency of hybrid promotor Ptac', comprising a synthetic trp-promoter and lacUV5 "-10" sequence, was studied. By means of electrophoresis and hybridization of RNA-products obtained in vitro and in minicells, with promotor-containing plasmids; the hybrid promotor was found to be 6 times and 3-4 times as efficient as trp and lacUV5 promoters, respectively.