I want to express shRNA against my gene of interest in a tetracycline regulatable manner (tet-on system). Can anyone suggest some suitable plasmids for the same? I have shRNAs with 5'BglII and 3'HindIII overhangs. Are there any relevant plasmids with such cloning sites? If I add overhangs for any other restriction enzymes will it alter the processivity of the shRNAs?