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Mol. Cell. Biol., 01 1998, 233-239, Vol 18, No. 1
Copyright © 1998, American Society for Microbiology

CIF150, a human cofactor for transcription factor IID-dependent initiator function

J Kaufmann, K Ahrens, R Koop, ST Smale and R Muller
Institute for Molecular Biology and Tumor Research, Philipps University, Marburg, Germany. Joerg_Kaufmann@chiron.com

The transcription factor IID (TFIID) complex is highly conserved between the Drosophila and mammalian systems. A mammalian homolog has been described for all the Drosophila TATA box-binding protein- associated factors (TAFs), with the exception of dTAF(II)150. We previously reported the identification of CIF, an essential cofactor for TFIID-dependent transcription from promoters containing initiator (Inr) elements. Here we describe the molecular cloning of CIF150, the human homolog of dTAF(II)150, and present biochemical evidence that this factor is involved in Inr activity. CIF150 is capable of mediating TFIID-dependent Inr activity in a complementation assay, and a protein fraction lacking Inr activity lacks detectable amounts of CIF150. Despite the striking similarity to dTAF(II)150, CIF150 does not appear to be associated with human TFIID. However, in vitro binding assays revealed a specific and direct interaction between CIF150 and hTAF(II)135. This interaction might be structurally important for the functional interaction between CIF150 and human TFIID, since CIF150 stabilizes TFIID binding to a core promoter.


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