8upf

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Cryo-EM structure of the human nucleosome core particle in complex with RNF168-UbcH5cCryo-EM structure of the human nucleosome core particle in complex with RNF168-UbcH5c

Structural highlights

8upf is a 12 chain structure with sequence from Homo sapiens. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance.
Method:Electron Microscopy, Resolution 3.2Å
Ligands:
Resources:FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT

Disease

RN168_HUMAN Defects in RNF168 are the cause of Riddle syndrome (RIDDLES) [MIM:611943. Riddle syndrome is characterized by increased radiosensitivity, immunodeficiency, mild motor control and learning difficulties, facial dysmorphism, and short stature. Defects are probably due to impaired localization of TP53BP1 and BRCA1 at DNA lesions.[1]

Function

RN168_HUMAN E3 ubiquitin-protein ligase required for accumulation of repair proteins to sites of DNA damage. Acts with UBE2N/UBC13 to amplify the RNF8-dependent histone ubiquitination. Recruited to sites of DNA damage at double-strand breaks (DSBs) by binding to ubiquitinated histone H2A and H2AX and amplifies the RNF8-dependent H2A ubiquitination, promoting the formation of 'Lys-63'-linked ubiquitin conjugates. This leads to concentrate ubiquitinated histones H2A and H2AX at DNA lesions to the threshold required for recruitment of TP53BP1 and BRCA1. Also recruited at DNA interstrand cross-links (ICLs) sites and promotes accumulation of 'Lys-63'-linked ubiquitination of histones H2A and H2AX, leading to recruitment of FAAP20/C1orf86 and Fanconi anemia (FA) complex, followed by interstrand cross-link repair. H2A ubiquitination also mediates the ATM-dependent transcriptional silencing at regions flanking DSBs in cis, a mechanism to avoid collision between transcription and repair intermediates. Also involved in class switch recombination in immune system, via its role in regulation of DSBs repair. Following DNA damage, promotes the ubiquitination and degradation of JMJD2A/KDM4A in collaboration with RNF8, leading to unmask H4K20me2 mark and promote the recruitment of TP53BP1 at DNA damage sites. Not able to initiate 'Lys-63'-linked ubiquitination in vitro; possibly due to partial occlusion of the UBE2N/UBC13-binding region. Catalyzes monoubiquitination of 'Lys-13' and 'Lys-15' of nucleosomal histone H2A (H2AK13Ub and H2AK15Ub, respectively).[2] [3] [4] [5] [6] [7] [8] [9]

Publication Abstract from PubMed

RNF168 plays a central role in the DNA damage response (DDR) by ubiquitylating histone H2A at K13 and K15. These modifications direct BRCA1-BARD1 and 53BP1 foci formation in chromatin, essential for cell-cycle-dependent DNA double-strand break (DSB) repair pathway selection. The mechanism by which RNF168 catalyzes the targeted accumulation of H2A ubiquitin conjugates to form repair foci around DSBs remains unclear. Here, using cryoelectron microscopy (cryo-EM), nuclear magnetic resonance (NMR) spectroscopy, and functional assays, we provide a molecular description of the reaction cycle and dynamics of RNF168 as it modifies the nucleosome and recognizes its ubiquitylation products. We demonstrate an interaction of a canonical ubiquitin-binding domain within full-length RNF168, which not only engages ubiquitin but also the nucleosome surface, clarifying how such site-specific ubiquitin recognition propels a signal amplification loop. Beyond offering mechanistic insights into a key DDR protein, our study aids in understanding site specificity in both generating and interpreting chromatin ubiquitylation.

Mechanisms of RNF168 nucleosome recognition and ubiquitylation.,Hu Q, Zhao D, Cui G, Bhandari J, Thompson JR, Botuyan MV, Mer G Mol Cell. 2024 Mar 7;84(5):839-853.e12. doi: 10.1016/j.molcel.2023.12.036. Epub , 2024 Jan 18. PMID:38242129[10]

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

See Also

References

  1. ↑ Stewart GS, Panier S, Townsend K, Al-Hakim AK, Kolas NK, Miller ES, Nakada S, Ylanko J, Olivarius S, Mendez M, Oldreive C, Wildenhain J, Tagliaferro A, Pelletier L, Taubenheim N, Durandy A, Byrd PJ, Stankovic T, Taylor AM, Durocher D. The RIDDLE syndrome protein mediates a ubiquitin-dependent signaling cascade at sites of DNA damage. Cell. 2009 Feb 6;136(3):420-34. doi: 10.1016/j.cell.2008.12.042. PMID:19203578 doi:10.1016/j.cell.2008.12.042
  2. ↑ Stewart GS, Panier S, Townsend K, Al-Hakim AK, Kolas NK, Miller ES, Nakada S, Ylanko J, Olivarius S, Mendez M, Oldreive C, Wildenhain J, Tagliaferro A, Pelletier L, Taubenheim N, Durandy A, Byrd PJ, Stankovic T, Taylor AM, Durocher D. The RIDDLE syndrome protein mediates a ubiquitin-dependent signaling cascade at sites of DNA damage. Cell. 2009 Feb 6;136(3):420-34. doi: 10.1016/j.cell.2008.12.042. PMID:19203578 doi:10.1016/j.cell.2008.12.042
  3. ↑ Doil C, Mailand N, Bekker-Jensen S, Menard P, Larsen DH, Pepperkok R, Ellenberg J, Panier S, Durocher D, Bartek J, Lukas J, Lukas C. RNF168 binds and amplifies ubiquitin conjugates on damaged chromosomes to allow accumulation of repair proteins. Cell. 2009 Feb 6;136(3):435-46. doi: 10.1016/j.cell.2008.12.041. PMID:19203579 doi:10.1016/j.cell.2008.12.041
  4. ↑ Shanbhag NM, Rafalska-Metcalf IU, Balane-Bolivar C, Janicki SM, Greenberg RA. ATM-dependent chromatin changes silence transcription in cis to DNA double-strand breaks. Cell. 2010 Jun 11;141(6):970-81. doi: 10.1016/j.cell.2010.04.038. PMID:20550933 doi:10.1016/j.cell.2010.04.038
  5. ↑ Gatti M, Pinato S, Maspero E, Soffientini P, Polo S, Penengo L. A novel ubiquitin mark at the N-terminal tail of histone H2As targeted by RNF168 ubiquitin ligase. Cell Cycle. 2012 Jul 1;11(13):2538-44. doi: 10.4161/cc.20919. Epub 2012 Jul 1. PMID:22713238 doi:10.4161/cc.20919
  6. ↑ Mallette FA, Mattiroli F, Cui G, Young LC, Hendzel MJ, Mer G, Sixma TK, Richard S. RNF8- and RNF168-dependent degradation of KDM4A/JMJD2A triggers 53BP1 recruitment to DNA damage sites. EMBO J. 2012 Feb 28;31(8):1865-78. doi: 10.1038/emboj.2012.47. PMID:22373579 doi:10.1038/emboj.2012.47
  7. ↑ Yan Z, Guo R, Paramasivam M, Shen W, Ling C, Fox D 3rd, Wang Y, Oostra AB, Kuehl J, Lee DY, Takata M, Hoatlin ME, Schindler D, Joenje H, de Winter JP, Li L, Seidman MM, Wang W. A ubiquitin-binding protein, FAAP20, links RNF8-mediated ubiquitination to the Fanconi anemia DNA repair network. Mol Cell. 2012 Jul 13;47(1):61-75. doi: 10.1016/j.molcel.2012.05.026. Epub 2012, Jun 14. PMID:22705371 doi:10.1016/j.molcel.2012.05.026
  8. ↑ Panier S, Ichijima Y, Fradet-Turcotte A, Leung CC, Kaustov L, Arrowsmith CH, Durocher D. Tandem protein interaction modules organize the ubiquitin-dependent response to DNA double-strand breaks. Mol Cell. 2012 Aug 10;47(3):383-95. doi: 10.1016/j.molcel.2012.05.045. Epub 2012 , Jun 27. PMID:22742833 doi:10.1016/j.molcel.2012.05.045
  9. ↑ Mattiroli F, Vissers JH, van Dijk WJ, Ikpa P, Citterio E, Vermeulen W, Marteijn JA, Sixma TK. RNF168 Ubiquitinates K13-15 on H2A/H2AX to Drive DNA Damage Signaling. Cell. 2012 Sep 14;150(6):1182-95. doi: 10.1016/j.cell.2012.08.005. PMID:22980979 doi:10.1016/j.cell.2012.08.005
  10. ↑ Hu Q, Zhao D, Cui G, Bhandari J, Thompson JR, Botuyan MV, Mer G. Mechanisms of RNF168 nucleosome recognition and ubiquitylation. Mol Cell. 2024 Mar 7;84(5):839-853.e12. PMID:38242129 doi:10.1016/j.molcel.2023.12.036

8upf, resolution 3.20Å

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