SCA7 (spinocerebellar ataxia type 7) is a neurodegenerative disorder caused by a CAG repeat expansion in the SCA7 gene that leads to elongation of a polyglutamine tract in ataxin-7, a protein of unknown function. Sgf73, a putative yeast orthologue of ataxin-7, has been identified as a new component of the yeast SAGA (Spt/Ada/Gcn5 acetyltransferase) multisubunit complex, a co-activator required for the transcription of a subset of RNA polymerase II-dependent genes. We show here that ataxin-7 is an integral component of mammalian SAGA-like complexes, i.e. the TFTC [TBP (TATA-binding protein)-free TAF (TBP-associated factor) complex] and the STAGA (SPT3/TAF9/GCN5 acetyltransferase) complex. In agreement with this, immunoprecipitation of ataxin-7 retained a histone acetyltransferase activity characteristic of TFTC-like complexes. Moreover, polyglutamine expansion in ataxin-7 did not affect its incorporation into TFTCs/STAGA complexes purified from cells from a SCA7 patient. We demonstrate here that ataxin-7 is the human orthologue of a the yeast SAGA Sgf73 subunit, and is a bona fide subunit of human TFTC-like transcriptional complexes.
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January 2006
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Conference Article|
January 01 2006
Both normal and polyglutamine- expanded ataxin-7 are components of TFTC-type GCN5 histone acetyltransferase- containing complexes
Dominique Helmlinger;
Dominique Helmlinger
∗Department of Molecular Pathology, Institut de Génétique et de Biologie Moléculaire et Cellulaire, UMR 7104, CNRS/IN SER M/ULP, BP 10142, 67404 Illkirch Cedex, France
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Sara Hardy;
Sara Hardy
†Department of Transcription, Institut de Génétique et de Biologie Moléculaire et Cellulaire, UMR 7104, CNRS/IN SER M/ULP, BP 10142, 67404 Illkirch Cedex, France
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Adrien Eberlin;
Adrien Eberlin
†Department of Transcription, Institut de Génétique et de Biologie Moléculaire et Cellulaire, UMR 7104, CNRS/IN SER M/ULP, BP 10142, 67404 Illkirch Cedex, France
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Didier Devys;
Didier Devys
∗Department of Molecular Pathology, Institut de Génétique et de Biologie Moléculaire et Cellulaire, UMR 7104, CNRS/IN SER M/ULP, BP 10142, 67404 Illkirch Cedex, France
†Department of Transcription, Institut de Génétique et de Biologie Moléculaire et Cellulaire, UMR 7104, CNRS/IN SER M/ULP, BP 10142, 67404 Illkirch Cedex, France
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Làszlò Tora
Làszlò Tora
1
†Department of Transcription, Institut de Génétique et de Biologie Moléculaire et Cellulaire, UMR 7104, CNRS/IN SER M/ULP, BP 10142, 67404 Illkirch Cedex, France
1To whom correspondence should be addressed (email [email protected])
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Publisher: Portland Press Ltd
Online ISSN: 1744-1439
Print ISSN: 0067-8694
© 2006 Biochemical Society
2006
Biochem Soc Symp (2006) 73: 155–163.
Citation
Stefan G.E. Roberts, Robert O.J. Weinzierl, Robert J. White, Dominique Helmlinger, Sara Hardy, Adrien Eberlin, Didier Devys, Làszlò Tora; Both normal and polyglutamine- expanded ataxin-7 are components of TFTC-type GCN5 histone acetyltransferase- containing complexes. Biochem Soc Symp 1 January 2006; 73 155–163. doi: https://doi.org/10.1042/bss0730155
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