PMID:15657039. OTX5 Enhances BMAL/CLOCK-mediated Expression through PRDM- PCEs—To examine the capability of OTX5 to directly bind and activate zfaanat2.

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OTX5 Enhances BMAL/CLOCK-mediated Expression through PRDM- PCEs—To examine the capability of OTX5 to directly bind and activate zfaanat2 through PRDM-PCEs, AA1M-PRDM reporter construct was co- transfected with zOTX5 expression vector into NIH-3T3 cells. OTX5 did not increase reporter gene expression over control levels; rather, most surprisingly, it reduced expression 2 L. Ziv and Y. Gothilf, unpublished results. (Fig. 3A), indicating that the relevant binding sites were not disrupted. These insertions also did not affect the level of expression driven by the hUSF1/mUSF2/zOTX5 combination (Fig. 3A). Nevertheless, co- transfection of AA1M-PRDM, hBMAL/mCLOCK, and zOTX5 resulted in a 10-fold increase in luciferase activity; this is significantly (p 0.001) greater than the increase obtained with hBMAL/mCLOCK alone (Fig. 3A), indicating that zOTX5 enhanced the hBMAL/mCLOCK-mediated transcription. In contrast, OTX5 did not stimulate expression when co-transfected with hUSF-1/hUSF-2 (Fig. 3B); rather, there was a tendency to reduce the USF- stimulated expression, indicating that the additive effect of OTX5 is specific for BMAL/CLOCK activation. Appelbaum, L. et al. JBC Vol. 280, No. 12, pp –11551, 2005

The GO annotation made

FIG. 3. Cooperative activation by BMAL/CLOCK heterodimer and OTX5 via PRDM. NIH-3T3 cells were transfected with a luciferase reporter driven by E-box-mutated AVP constructs (AA1M) (29) containing WT and mutated PRDM. Mutations include E-box mutation (ME), mutation of all PCEs (MP), and an insertion of 6 (M6) or 10 (M10) nucleotides between the E-box and PCEs. The cells were co-transfected with combinations of expression vectors (indicated by ) of zOTX5 and hBMAL/mCLOCK (A) or hUSF1/mUSF2 (B). Transcriptional activity is expressed as relative luciferase activity (mean S.E.). Results are the mean of three independent experiments performed in triplicate. Statistical analysis was performed by 3-way ANOVA. Appelbaum, L. et al. JBC Vol. 280, No. 12, pp –11551, 2005