Role of Nse1 Subunit of SMC5/6 Complex as a Ubiquitin Ligase

Investor logo
Investor logo

Warning

This publication doesn't include Institute of Computer Science. It includes Faculty of Science. Official publication website can be found on muni.cz.
Authors

KOLESÁR Peter STEJSKAL Karel POTĚŠIL David MURRAY Johanne M PALEČEK Jan

Year of publication 2022
Type Article in Periodical
Magazine / Source Cells
MU Faculty or unit

Faculty of Science

Citation
web https://www.mdpi.com/2073-4409/11/1/165
Doi http://dx.doi.org/10.3390/cells11010165
Keywords SMC5; 6; Nse1; ubiquitin ligase; ubiquitination; Ubc13; Mms2; Nse4 kleisin
Description Structural Maintenance of Chromosomes (SMC) complexes are important for many aspects of the chromosomal organization. Unlike cohesin and condensin, the SMC5/6 complex contains a variant RING domain carried by its Nse1 subunit. RING domains are characteristic for ubiquitin ligases, and human NSE1 has been shown to possess ubiquitin-ligase activity in vitro. However, other studies were unable to show such activity. Here, we confirm Nse1 ubiquitin-ligase activity using purified Schizosaccharomyces pombe proteins. We demonstrate that the Nse1 ligase activity is stimulated by Nse3 and Nse4. We show that Nse1 specifically utilizes Ubc13/Mms2 E2 enzyme and interacts directly with ubiquitin. We identify the Nse1 mutation (R188E) that specifically disrupts its E3 activity and demonstrate that the Nse1-dependent ubiquitination is particularly important under replication stress. Moreover, we determine Nse4 (lysine K181) as the first known SMC5/6-associated Nse1 substrate. Interestingly, abolition of Nse4 modification at K181 leads to suppression of DNA-damage sensitivity of other SMC5/6 mutants. Altogether, this study brings new evidence for Nse1 ubiquitin ligase activity, significantly advancing our understanding of this enigmatic SMC5/6 function.
Related projects:

You are running an old browser version. We recommend updating your browser to its latest version.

More info