| Structural highlights
Function
ING5_HUMAN Component of the HBO1 complex which has a histone H4-specific acetyltransferase activity, a reduced activity toward histone H3 and is responsible for the bulk of histone H4 acetylation in vivo. Component of the MOZ/MORF complex which has a histone H3 acetyltransferase activity. Through chromatin acetylation it may regulate DNA replication and may function as a transcriptional coactivator.[1] [2]
Publication Abstract from PubMed
The INhibitor of Growth (ING) family of tumor suppressors regulates the transcriptional state of chromatin by recruiting remodeling complexes to sites with histone H3 trimethylated at lysine 4 (H3K4me3). This modification is recognized by the plant homeodomain (PHD) present at the C-terminus of the five ING proteins. ING5 facilitates histone H3 acetylation by the HBO1 complex, and also H4 acetylation by the MOZ/MORF complex. We show that ING5 forms homodimers through its N-terminal domain, which folds independently into an elongated coiled-coil structure. The central region of ING5, which contains the nuclear localization sequence, is flexible and disordered, but it binds dsDNA with micromolar affinity. NMR analysis of the full-length protein reveals that the two PHD fingers of the dimer are chemically equivalent and independent of the rest of the molecule, and they bind H3K4me3 in the same way as the isolated PHD. We have observed that ING5 can form heterodimers with the highly homologous ING4, and that two of three primary tumor-associated mutants in the N-terminal domain strongly destabilize the coiled-coil structure. They also affect cell proliferation and cell cycle phase distribution, suggesting a driver role in cancer progression.
The Tumor Suppressor ING5 Is a Dimeric, Bivalent Recognition Molecule of the Histone H3K4me3 Mark.,Ormaza G, Rodriguez JA, Ibanez de Opakua A, Merino N, Villate M, Gorrono I, Rabano M, Palmero I, Vilaseca M, Kypta R, Vivanco MDM, Rojas AL, Blanco FJ J Mol Biol. 2019 May 31;431(12):2298-2319. doi: 10.1016/j.jmb.2019.04.018. Epub, 2019 Apr 24. PMID:31026448[3]
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.
References
- ↑ Shiseki M, Nagashima M, Pedeux RM, Kitahama-Shiseki M, Miura K, Okamura S, Onogi H, Higashimoto Y, Appella E, Yokota J, Harris CC. p29ING4 and p28ING5 bind to p53 and p300, and enhance p53 activity. Cancer Res. 2003 May 15;63(10):2373-8. PMID:12750254
- ↑ Doyon Y, Cayrou C, Ullah M, Landry AJ, Cote V, Selleck W, Lane WS, Tan S, Yang XJ, Cote J. ING tumor suppressor proteins are critical regulators of chromatin acetylation required for genome expression and perpetuation. Mol Cell. 2006 Jan 6;21(1):51-64. PMID:16387653 doi:10.1016/j.molcel.2005.12.007
- ↑ Ormaza G, Rodriguez JA, Ibanez de Opakua A, Merino N, Villate M, Gorrono I, Rabano M, Palmero I, Vilaseca M, Kypta R, Vivanco MDM, Rojas AL, Blanco FJ. The Tumor Suppressor ING5 Is a Dimeric, Bivalent Recognition Molecule of the Histone H3K4me3 Mark. J Mol Biol. 2019 May 31;431(12):2298-2319. doi: 10.1016/j.jmb.2019.04.018. Epub, 2019 Apr 24. PMID:31026448 doi:http://dx.doi.org/10.1016/j.jmb.2019.04.018
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