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•••• HUST-China 2015

Figure 1: The whole circuit The CRY2/CIB1 interaction is entirely genetically encoded and does not require addition of any exogenous cofactors. The binding naturally reverses within minutes in the dark, allowing rapid shutoff of transcription by placing samples in the dark. a Gal4 DNA binding domain fused to N terminus of CRY2 and a Gal4 DNA activating domain fused to N terminus of CIB1 are for use in a yeast-two-hybrid system. To regulate DNA transcription by blue light, the system is based on a two-hybrid interaction in which a light-mediated protein interaction brings together two halves (a binding domain and an activation domain) of a split transcription factor. If we remove the stimulation of blue light, dark reversion of CRY2 will dissociate the interaction with CIB1 and halt Gal4-dependent transcription. The principle of blue-light-control system based on yeast-two-hybrid. Characterization From addgene, we received a plasmid pRMH120 that containing both Gal4BD-CRY2 and Gal4AD-CIB1 fusions on a p414TEF backbone. These two fusions are under the control of constitutive promoter PTEF1 and PADH1 respectively. Since promoterUAS-PGal1 and downstream gene β-galactosidase exists in yeast Y187 originally, we can validate the light-control system by testing the activity of β-galactosidase. Thus, we use Saccharomyces cerevisiae Y187 as chassis to test the light-control system. Figure3: β-galactosidase activity of CRY2-CIB1 system tested in darkness or light. The control group was wildtype Y187. (Error bars represent sample standard error, n = 4). Experiments were carried out three times with similar results to show. We observed that pRMH120 transformed cells incubated in white light (18W) gave distinguishable activation from pRMH120 tansformed cells incubated in total darkness, which means that GalBD-CRY2 coupled well with GalAD-CIB1 for light-inducible protein expression. Considering AD and BD could bind randomly, the result that the strains with pRMH120 in darkness was also activated a bit than the control wildtype yeast is reasonable.

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