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The basal transcription factor SNAP c  binds to the PSE, a core element in the RNA polymerase II and III human snRNA promoters. SNAP c  contains at least four subunits, but it has not been possible to assemble a fully defined recombinant SNAP c . Here we reconstitute SNAP c  from five recombinant subunits, SNAP43, SNAP45, SNAP50, SNAP190, and a newly identified subunit, SNAP19. This recombinant complex binds specifically to the PSE and directs both RNA polymerase II and III snRNA gene transcription. Thus, the same core SNAP c  nucleates the assembly of two classes of initiation complexes.

SNAP19 mediates the assembly of a functional core promoter complex (SNAPc) shared by RNA polymerases II and III

SNAP19 mediates the assembly of a functional core promoter complex (SNAP_c) shared by RNA polymerases II and III