Drosophila_melanogasterFamily: Ssu72 Number of Genes: 1
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The highly conserved and essential protein Ssu72 has intrinsic phosphatase activity and plays an essential role in the transcription cycle. Ssu72 was originally identified in a yeast genetic screen as enhancer of a defect caused by a mutation in the transcription initiation factor TFIIB [1]. It binds to TFIIB and is also involved in mRNA elongation. Ssu72 is further involved in both poly(A) dependent and independent termination. It is a subunit of the yeast cleavage and polyadenylation factor (CPF), which is part of the machinery for mRNA 3'-end formation. Ssu72 is also essential for transcription termination of snRNAs [4].


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  1. Sun ZW, Hampsey M; , Mol Cell Biol 1996;16:1557-1566.: Synthetic enhancement of a TFIIB defect by a mutation in SSU72, an essential yeast gene encoding a novel protein that affects transcription start site selection in vivo. PUBMED:8657130 EPMC:8657130 .

  2. Dichtl B, Blank D, Ohnacker M, Friedlein A, Roeder D, Langen H, Keller W; , Mol Cell 2002;10:1139-1150.: A role for SSU72 in balancing RNA polymerase II transcription elongation and termination. PUBMED:12453421 EPMC:12453421 .

  3. St-Pierre B, Liu X, Kha LC, Zhu X, Ryan O, Jiang Z, Zacksenhaus E; , Nucleic Acids Res 2005;33:464-477.: Conserved and specific functions of mammalian ssu72. PUBMED:15659578 EPMC:15659578 .

  4. Meinhart A, Kamenski T, Hoeppner S, Baumli S, Cramer P; , Genes Dev 2005;19:1401-1415.: A structural perspective of CTD function. PUBMED:15964991 EPMC:15964991 .

  5. Ganem C, Devaux F, Torchet C, Jacq C, Quevillon-Cheruel S, Labesse G, Facca C, Faye G; , EMBO J 2003;22:1588-1598.: Ssu72 is a phosphatase essential for transcription termination of snoRNAs and specific mRNAs in yeast. PUBMED:12660165 EPMC:12660165.