8DJI

Ternary complex of SUMO1 with the SIM of PML and zinc

Summary for 8DJI

• Entry DOI: 10.2210/pdb8dji/pdb
• Descriptor: Small ubiquitin-related modifier 1, Protein PML, ZINC ION, ... (4 entities in total)
• Functional Keywords: sumo1, pml nuclear bodies, zinc, auto-inhibition, daxx, nuclear protein
• Biological source: Homo sapiens (human); More
• Total number of polymer chains: 2
• Total formula weight: 14216.55

Authors

Lussier-Price, M.,Wahba, H.M.,Mascle, X.H.,Cappadocia, L.,Bourdeau, V.,Gagnon, C.,Igelmann, S.,Sakaguchi, K.,Ferbeyre, G.,Omichinski, J.G. (deposition date: 2022-06-30, release date: 2022-08-10, Last modification date: 2023-10-18)

Primary citation

Lussier-Price, M.,Wahba, H.M.,Mascle, X.H.,Cappadocia, L.,Bourdeau, V.,Gagnon, C.,Igelmann, S.,Sakaguchi, K.,Ferbeyre, G.,Omichinski, J.G.
Zinc controls PML nuclear body formation through regulation of a paralog specific auto-inhibition in SUMO1.
Nucleic Acids Res., 50:8331-8348, 2022

PubMed Abstract: SUMO proteins are important regulators of many key cellular functions in part through their ability to form interactions with other proteins containing SUMO interacting motifs (SIMs). One characteristic feature of all SUMO proteins is the presence of a highly divergent intrinsically disordered region at their N-terminus. In this study, we examine the role of this N-terminal region of SUMO proteins in SUMO-SIM interactions required for the formation of nuclear bodies by the promyelocytic leukemia (PML) protein (PML-NBs). We demonstrate that the N-terminal region of SUMO1 functions in a paralog specific manner as an auto-inhibition domain by blocking its binding to the phosphorylated SIMs of PML and Daxx. Interestingly, we find that this auto-inhibition in SUMO1 is relieved by zinc, and structurally show that zinc stabilizes the complex between SUMO1 and a phospho-mimetic form of the SIM of PML. In addition, we demonstrate that increasing cellular zinc levels enhances PML-NB formation in senescent cells. Taken together, these results provide important insights into a paralog specific function of SUMO1, and suggest that zinc levels could play a crucial role in regulating SUMO1-SIM interactions required for PML-NB formation and function.

PubMed: 35871297
DOI: 10.1093/nar/gkac620

Experimental method

X-RAY DIFFRACTION (1.97 Å)