Journal Article

SUMOylation of the ING1b tumor suppressor regulates gene transcription

Shankha Satpathy, Claire Guérillon, Tae-Sun Kim, Nicolas Bigot, Satbir Thakur, Shirin Bonni, Karl Riabowol and Rémy Pedeux

in Carcinogenesis

Volume 35, issue 10, pages 2214-2223
Published in print October 2014 | ISSN: 0143-3334
Published online June 2014 | e-ISSN: 1460-2180 | DOI: http://dx.doi.org/10.1093/carcin/bgu126
SUMOylation of the ING1b tumor suppressor regulates gene transcription

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The INhibitor of Growth (ING) proteins are encoded as multiple isoforms in five ING genes (ING1 –5) and act as type II tumor suppressors. They are growth inhibitory when overexpressed and are frequently mislocalized or downregulated in several forms of cancer. ING1 and ING2 are stoichiometric members of histone deacetylase complexes, whereas ING3–5 are stoichiometric components of different histone acetyltransferase complexes. The INGs target these complexes to histone marks, thus acting as epigenetic regulators. ING proteins affect angiogenesis, apoptosis, DNA repair, metastasis and senescence, but how the proteins themselves are regulated is not yet clear. Here, we find a small ubiquitin-like modification (SUMOylation) of the ING1b protein and identify lysine 193 (K193) as the preferred ING1b SUMO acceptor site. We also show that PIAS4 is the E3 SUMO ligase responsible for ING1b SUMOylation on K193. Sequence alignment reveals that the SUMO consensus site on ING1b contains a phosphorylation-dependent SUMOylation motif (PDSM) and our data indicate that the SUMOylation on K193 is enhanced by the S199D phosphomimic mutant. Using an ING1b protein mutated at the major SUMOylation site (ING1b E195A), we further demonstrate that ING1b SUMOylation regulates the binding of ING1b to the ISG15 and DGCR8 promoters, consequently regulating ISG15 and DGCR8 transcription. These results suggest a role for ING1b SUMOylation in the regulation of gene transcription.

Journal Article.  6820 words.  Illustrated.

Subjects: Clinical Cytogenetics and Molecular Genetics

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