Applications of BBa_K396000
BBa_K396000
low unregulated, repressed by lambda CI, activated by T7 RNA Polymerase, repression is stronger than activation.
T7/CI-OR1 hybrid promoter
T7/CI-OR1 hybrid promoter was designed to be activated by T7 RNA Polymerase and repressed by lambda CI protein. In sequence design, lambda CI operator site 1 (OR1, Part of BBa_R1051) was directly attached to the downstream of T7 promoter sequence (BBa_I719005). This characterization was implemented to validate the promoter function. In results, the activation and repression was actually observed.
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Results and Conclusion
Under the situation of CI non-expressed , T7 RNAP causes GFP expression by activating T7/CI hybrid
promoter (Fig.1). On the other hand, under the situation of CI expressed, T7 RNAP does not cause GFP
expression (Fig.2). The reason of this is considered as following. Under the situation of CI expressed,
even though T7 RNAP tries to activate T7/CI promoter, the promoter Is repressed by CI because the
ability of CI repression is superior to the one of T7 activation for this promoter. So it is concluded that
T7/CI hybrid promoter is to be activated by T7 RNA Polymerase and repressed by lambda CI protein,
following the rules of CI repression > T7 activation.
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UNIQ296d75e1dc591aff-partinfo-00000001-QINU
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