Download MendeleyThe RBR E3 ubiquitin ligase HOIL-1 can ubiquitinate diverse non-protein substrates in vitro.
Wang, X.S., Jiou, J., Cerra, A., Cobbold, S.A., Jochem, M., Mak, K.H.T., Corcilius, L., Silke, J., Payne, R.J., Goddard-Borger, E.D., Komander, D., Lechtenberg, B.C.(2025) Life Sci Alliance 8
- PubMed: 40169258
- DOI: https://doi.org/10.26508/lsa.202503243
- Primary Citation of Related Structures:
9EGV, 9EGW - PubMed Abstract:
HOIL-1 is a RING-between-RING-family E3 ubiquitin ligase and a component of the linear ubiquitin chain assembly complex. Although most E3 ubiquitin ligases conjugate ubiquitin to protein lysine sidechains, HOIL-1 has also been reported to ubiquitinate hydroxyl groups in protein serine and threonine sidechains and glucosaccharides, such as glycogen and its building block maltose, in vitro. However, HOIL-1 substrate specificity is currently poorly defined. Here, we show that HOIL-1 is unable to ubiquitinate lysine but can efficiently ubiquitinate serine and a variety of model and physiologically relevant di- and monosaccharides in vitro. We identify a critical catalytic histidine residue, His510, in the flexible catalytic site of HOIL-1 that enables this O-linked ubiquitination and prohibits ubiquitin discharge onto lysine sidechains. We use HOIL-1's in vitro non-proteinaceous ubiquitination activity to produce preparative amounts of different ubiquitinated saccharides that can be used as tool compounds and standards in the rapidly emerging field of non-proteinaceous ubiquitination. Finally, we report an engineered, constitutively active HOIL-1 variant that simplifies in vitro generation of ubiquitinated saccharides.
- Ubiquitin Signalling Division, The Walter and Eliza Hall Institute of Medical Research, Parkville, Australia.
Organizational Affiliation:
