title: Human transcription factor IIIC box B binding subunit.
abstract: Transcription factor IIIC (TFIIIC) is a multisubunit basic TF for RNA polymerase III. It initiates transcription complex assembly on tRNA and related genes by binding to the internal box B promoter element and is also required for transcription of 5S rRNA and other stable nuclear and cytoplasmic RNAs transcribed by polymerase III. In mammalian cells, regulation of TFIIIC activity controls overall polymerase III transcription in response to growth factors and viral infection. Here, we report the cloning and sequencing of a full-length cDNA (and genomic DNA from the transcription initiation region) encoding the box B binding subunit of human TFIIIC, the 243-kDa alpha subunit. Specific antisera raised against the encoded protein super shifts a TFIIIC-box B DNA complex during an electrophoretic mobility shift assay and immunodepletes TFIIIC transcriptional activity from a partially purified TFIIIC fraction, proving that the cDNA encodes a component of TFIIIC. The human protein shows surprisingly little similarity to the box B binding subunit of yeast TFIIIC.
authors.affiliation: Department of Microbiology and Molecular Genetics, University of California, Los Angeles 90024-1570.
authors.forename: N D
authors.initials: ND
authors.lastname: L'Etoile
authors.forename: M L
authors.initials: ML
authors.lastname: Fahnestock
authors.forename: Y
authors.initials: Y
authors.lastname: Shen
authors.forename: R
authors.initials: R
authors.lastname: Aebersold
authors.forename: A J
authors.initials: AJ
authors.lastname: Berk
mesh_terms: D000595:Amino Acid Sequence; D001483:Base Sequence; D003001:Cloning, Molecular; D017931:DNA Primers / Q000235:genetics; D018076:DNA, Complementary / Q000235:genetics; D006801:Humans; D008969:Molecular Sequence Data; D011487:Protein Conformation; D012320:RNA Polymerase III / Q000235:genetics; D012441:Saccharomyces cerevisiae / Q000235:genetics; D017386:Sequence Homology, Amino Acid; D013045:Species Specificity; D014157:Transcription Factors / Q000737:chemistry / Q000235:genetics* / Q000378:metabolism; D019474:Transcription Factors, TFIII; D014158:Transcription, Genetic; D000098832:Transcription Factor TFIIIC
chemical_list: D017931:DNA Primers; D018076:DNA, Complementary; D014157:Transcription Factors; D019474:Transcription Factors, TFIII; D000098832:Transcription Factor TFIIIC; D012320:RNA Polymerase III