Program in Molecular Medicine
Amino Acids, Peptides, and Proteins | Biochemistry | Molecular Biology
The protein deacetylase SIRT6 maintains cellular homeostasis through multiple pathways that include the deacetylation of histone H3 and repression of transcription. Prior work suggests that SIRT6 is associated with chromatin and can substantially reduce global levels of H3 acetylation, but how SIRT6 is able to accomplish this feat is unknown. Here, we describe an exquisitely tight interaction between SIRT6 and nucleosome core particles, in which a 2:1 enzyme:nucleosome complex assembles via asymmetric binding with distinct affinities. While both SIRT6 molecules associate with the acidic patch on the nucleosome, we find that the intrinsically disordered SIRT6 C-terminus promotes binding at the higher affinity site through recognition of nucleosomal DNA. Together, multivalent interactions couple productive binding to efficient deacetylation of histones on endogenous chromatin. Unique among histone deacetylases, SIRT6 possesses the intrinsic capacity to tightly interact with nucleosomes for efficient activity.
Acetylation, Chromatin, Nucleosomes
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Copyright © The Author(s) 2020. Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.
DOI of Published Version
Liu WH, Zheng J, Feldman JL, Klein MA, Kuznetsov VI, Peterson CL, Griffin PR, Denu JM. Multivalent interactions drive nucleosome binding and efficient chromatin deacetylation by SIRT6. Nat Commun. 2020 Oct 16;11(1):5244. doi: 10.1038/s41467-020-19018-y. PMID: 33067423; PMCID: PMC7568541. Link to article on publisher's site
Liu WH, Zheng J, Feldman JL, Klein MA, Kuznetsov VI, Peterson CL, Griffin PR, Denu JM. (2020). Multivalent interactions drive nucleosome binding and efficient chromatin deacetylation by SIRT6. Open Access Publications by UMMS Authors. https://doi.org/10.1038/s41467-020-19018-y. Retrieved from https://escholarship.umassmed.edu/oapubs/4432
Creative Commons License
This work is licensed under a Creative Commons Attribution 4.0 License.