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We constructed a photoresponsive T7 promoter by tethering two 2,6-dimethyl azobenzenes (4-(2,6-dimethyl-phenlylazo)-benzoic acids) via D-threoninol linkers. Under UV light irradiation, the rate of transcription with T7 RNA polymerase (RNAP) on the photoresponsive promoter was 10-fold faster than that under visible light irradiation. Kinetic analysis revealed that K(m) of cis-cis-promoter (both of the introduced azobenzenes are in cis-form) with T7 RNAP was more than 60 times larger than that of trans-trans-form, indicating that the high photoregulatory efficiency was obtained mainly due to the remarkable difference in their affinity with RNAP. By attaching a photoresponsive promoter to the GFP gene, we also showed that photoregulation of gene expression became practicable.

Effective photoregulation of gene expression by photo responsive T7 promoter