obsolete RNA polymerase III hybrid type promoter TFIIIB-type transcription factor activity (obsolete GO:0001040)
OBSOLETE. Binding to an RNA polymerase III (Pol III) complex, typically composed of seventeen subunits, and with another protein, macromolecule, or complex, permitting those molecules to function in a coordinated way. Once recruited to an RNA polymerase III hybrid type promoter, binds to DNA, recruits RNA polymerase III and facilitates the transition from the closed to the open complex.