An ARC/Mediator subunit required for SREBP control of cholesterol and lipid homeostasis

Fajun Yang, Bryan W. Vought, John S. Satterlee, Amy K. Walker, Z. Y. Jim Sun, Jennifer L. Watts, Rosalie DeBeaumont, R. Mako Saito, Sven G. Hyberts, Shaosong Yang, Christine Macol, Lakshmanan Iyer, Robert Tjian, Sander Van Den Heuvel, Anne C. Hart, Gerhard Wagner, Anders M. Näär

Research output: Contribution to journalArticle

230 Citations (Scopus)

Abstract

The sterol regulatory element binding protein (SREBP) family of transcription activators are critical regulators of cholesterol and fatty acid homeostasis. We previously demonstrated that human SREBPs bind the CREB-binding protein (CBP)/p300 acetyltransferase KIX domain and recruit activator-recruited co-factor (ARC)/Mediator co-activator complexes through unknown mechanisms. Here we show that SREBPs use the evolutionarily conserved ARC105 (also called MED15) subunit to activate target genes. Structural analysis of the SREBP-binding domain in ARC105 by NMR revealed a three-helix bundle with marked similarity to the CBP/p300 KIX domain. In contrast to SREBPs, the CREB and c-Myb activators do not bind the ARC105 KIX domain, although they interact with the CBP KIX domain, revealing a surprising specificity among structurally related activator-binding domains. The Caenorhabditis elegans SREBP homologue SBP-1 promotes fatty acid homeostasis by regulating the expression of lipogenic enzymes. We found that, like SBP-1, the C. elegans ARC105 homologue MDT-15 is required for fatty acid homeostasis, and show that both SBP-1 and MDT-15 control transcription of genes governing desaturation of stearic acid to oleic acid. Notably, dietary addition of oleic acid significantly rescued various defects of nematodes targeted with RNA interference against sbp-1 and mdt-15, including impaired intestinal fat storage, infertility, decreased size and slow locomotion, suggesting that regulation of oleic acid levels represents a physiologically critical function of SBP-1 and MDT-15. Taken together, our findings demonstrate that ARC105 is a key effector of SREBP-dependent gene regulation and control of lipid homeostasis in metazoans.

Original languageEnglish (US)
Pages (from-to)700-704
Number of pages5
JournalNature
Volume442
Issue number7103
DOIs
StatePublished - Aug 10 2006
Externally publishedYes

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Sterol Regulatory Element Binding Proteins
CREB-Binding Protein
Homeostasis
Oleic Acid
Cholesterol
Lipids
Fatty Acids
Caenorhabditis elegans
Genes
Locomotion
RNA Interference
Protein Binding
Infertility
Fats
Enzymes

ASJC Scopus subject areas

  • General

Cite this

Yang, F., Vought, B. W., Satterlee, J. S., Walker, A. K., Jim Sun, Z. Y., Watts, J. L., ... Näär, A. M. (2006). An ARC/Mediator subunit required for SREBP control of cholesterol and lipid homeostasis. Nature, 442(7103), 700-704. https://doi.org/10.1038/nature04942

An ARC/Mediator subunit required for SREBP control of cholesterol and lipid homeostasis. / Yang, Fajun; Vought, Bryan W.; Satterlee, John S.; Walker, Amy K.; Jim Sun, Z. Y.; Watts, Jennifer L.; DeBeaumont, Rosalie; Mako Saito, R.; Hyberts, Sven G.; Yang, Shaosong; Macol, Christine; Iyer, Lakshmanan; Tjian, Robert; Van Den Heuvel, Sander; Hart, Anne C.; Wagner, Gerhard; Näär, Anders M.

In: Nature, Vol. 442, No. 7103, 10.08.2006, p. 700-704.

Research output: Contribution to journalArticle

Yang, F, Vought, BW, Satterlee, JS, Walker, AK, Jim Sun, ZY, Watts, JL, DeBeaumont, R, Mako Saito, R, Hyberts, SG, Yang, S, Macol, C, Iyer, L, Tjian, R, Van Den Heuvel, S, Hart, AC, Wagner, G & Näär, AM 2006, 'An ARC/Mediator subunit required for SREBP control of cholesterol and lipid homeostasis', Nature, vol. 442, no. 7103, pp. 700-704. https://doi.org/10.1038/nature04942
Yang F, Vought BW, Satterlee JS, Walker AK, Jim Sun ZY, Watts JL et al. An ARC/Mediator subunit required for SREBP control of cholesterol and lipid homeostasis. Nature. 2006 Aug 10;442(7103):700-704. https://doi.org/10.1038/nature04942
Yang, Fajun ; Vought, Bryan W. ; Satterlee, John S. ; Walker, Amy K. ; Jim Sun, Z. Y. ; Watts, Jennifer L. ; DeBeaumont, Rosalie ; Mako Saito, R. ; Hyberts, Sven G. ; Yang, Shaosong ; Macol, Christine ; Iyer, Lakshmanan ; Tjian, Robert ; Van Den Heuvel, Sander ; Hart, Anne C. ; Wagner, Gerhard ; Näär, Anders M. / An ARC/Mediator subunit required for SREBP control of cholesterol and lipid homeostasis. In: Nature. 2006 ; Vol. 442, No. 7103. pp. 700-704.
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