Comments
Restriction digests of the clone give the following sizes (kb): EcoRI--9.0; EcoRV--5.4, 3.7; SspI--5.0, 1.7, 1.5, 0.9; EcoRI/MluI--8.2, 0.8.
Contains sequences encoding lacIq, a tac promoter, and lacZalpha to allow direct screening by inactivation of alpha-complementation.
Constructed by replacing the MluI/EcoRI fragment of pMMB190 (taclacUV5 promoter) with the MluI/EcoRI fragment of pMMB311 (tac promoter).