SUMOylation is enriched in the nuclear matrix and required for chromosome segregation.

As an important posttranslational modification, SUMOylation plays critical roles in almost all biological processes. Although it has been well-documented that SUMOylated proteins are mainly localized in the nucleus and have roles in chromatin-related processes, we showed recently that the SUMOylation machinery is actually enriched in the nuclear matrix rather than chromatin. Here, we provide compelling biochemical, cellular imaging and proteomic evidence that SUMOylated proteins are highly enriched in the nuclear matrix. We demonstrated that inactivation of SUMOylation by inhibiting SUMO-activating E1 enzyme or KO of SUMO-conjugating E2 enzyme UBC9 have only mild effect on nuclear matrix composition, indicating that SUMOylation is neither required for nuclear matrix formation nor for targeting proteins to nuclear matrix. Further characterization of UBC9 KO cells revealed that loss of SUMOylation did not result in significant DNA damage, but led to mitotic arrest and chromosome missegregation. Altogether, our study demonstrates that SUMOylated proteins are selectively enriched in the nuclear matrix and suggests a role of nuclear matrix in mediating SUMOylation and its regulated biological processes. Copyright © 2023 The Authors. Published by Elsevier Inc. All rights reserved.

Citation

Zhaosu Chen, Jing Luo, Yunpeng Zhang, Shaoqi Zheng, Huifang Zhang, Yuanyong Huang, Jiemin Wong, Jiwen Li. SUMOylation is enriched in the nuclear matrix and required for chromosome segregation. The Journal of biological chemistry. 2024 Jan;300(1):105547

Mesh Tags

Substances

PMID: 38072047

search → result