Assembly of human small nuclear RNA gene-specific transcription factor IIIB complex de novo on and off promoter.
In humans, transcription factor IIIB (TFIIIB)-alpha governs basal transcription from small nuclear RNA genes by RNA polymerase III (pol III). One of the components of this complex, BRFU/TFIIIB50, is specific for these promoters, whereas TATA-binding protein (TBP) and hB" are required for pol III transcription from both gene external and internal promoters. We show that hB" is specifically recruited to a promoter-bound TBP.BRFU complex, which we have previously demonstrated as forming on TATA-...Expand abstract
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