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- _5 value "o biochemically characterize the transcriptional activity of GCMa/1, we set up an in vitro transcription system for human GCMa/1 (hGCMa/1). Using G-free reporter constructs carrying multiple copies of wild-type or mutant GCMa-binding site (GBS) in front of a synthetic TATA box, we observed specific transcriptional activities of recombinant hGCMa/1 proteins prepared from a baculovirus--insect cell or Escherichia coli expression system. We further characterized GCMa/1-mediated transcriptional activation on the native syncytin promoter. Using G-free reporter constructs containing the native syncytin promoter, a TATA box downstream of the proximal GBS in the syncytin promoter was shown to be essential for the transcription activation directed by hGCMa/1. " provenance.