hTAF(II)68, a novel RNA/ssDNA-binding protein with homology to the pro-oncoproteins TLS/FUS and EWS is associated with both TFIID and RNA polymerase II.
TFIID is the main sequence-specific DNA-binding component of the RNA polymerase II (Pol II) transcriptional machinery. It is a multiprotein complex composed of the TATA-binding protein (TBP) and TBP-associated factors (TAF(II)s). Here we report the cloning and characterization of a novel human TBP-associated factor, hTAF(II)68. It contains a consensus RNA-binding domain (RNP-CS) and binds not only RNA, but also single stranded (ss) DNA. hTAF(II)68 shares extensive sequence similarity with TLS/FUS and EWS, two human nuclear RNA-binding pro-oncoproteins which are products of genes commonly translocated in human sarcomas. Like hTAF(II)68, TLS/FUS is also associated with a sub-population of TFIID complexes chromatographically separable from those containing hTAF(II)68. Therefore, these RNA and/or ssDNA-binding proteins may play specific roles during transcription initiation at distinct promoters. Moreover, we demonstrate that hTAF(II)68 co-purifies also with the human RNA polymerase II and can enter the preinitiation complex together with Pol II.
Bertolotti
A
A
Institut de Génétique et de Biologie Moléculaire et Cellulaire CNRS/INSERM/ULP, Illkirch, France.
Lutz
Y
Y
Heard
D J
DJ
Chambon
P
P
Tora
L
L
D000595:Amino Acid Sequence; D001483:Base Sequence; D004257:DNA Polymerase II / Q000378:metabolism*; D004277:DNA, Single-Stranded / Q000378:metabolism; D004591:Electrophoresis, Polyacrylamide Gel; D006367:HeLa Cells; D034441:Heterogeneous-Nuclear Ribonucleoproteins; D006801:Humans; D008969:Molecular Sequence Data; D009363:Neoplasm Proteins / Q000737:chemistry / Q000378:metabolism; D012313:RNA / Q000378:metabolism; D012332:RNA, Heterogeneous Nuclear / Q000378:metabolism; D034802:RNA-Binding Protein EWS; D034702:RNA-Binding Protein FUS; D016601:RNA-Binding Proteins / Q000737:chemistry / Q000378:metabolism; D012261:Ribonucleoproteins / Q000737:chemistry / Q000378:metabolism; D016415:Sequence Alignment; D035381:TATA-Binding Protein Associated Factors; D035362:Transcription Factor TFIID; D014157:Transcription Factors / Q000737:chemistry / Q000235:genetics / Q000378:metabolism*
D004277:DNA, Single-Stranded; D034441:Heterogeneous-Nuclear Ribonucleoproteins; D009363:Neoplasm Proteins; D012332:RNA, Heterogeneous Nuclear; D034802:RNA-Binding Protein EWS; D034702:RNA-Binding Protein FUS; D016601:RNA-Binding Proteins; D012261:Ribonucleoproteins; C102041:TAF15 protein, human; D035381:TATA-Binding Protein Associated Factors; D035362:Transcription Factor TFIID; D014157:Transcription Factors; D012313:RNA; D004257:DNA Polymerase II