Trans-binding of UFM1 to UBA5 stimulates UBA5 homodimerization and ATP binding

Bayan Mashahreh, Fouad Hassouna, Nadine Soudah, Einav Cohen-Kfir, Roi Strulovich, Yoni Haitin, Reuven Wiener*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

16 Scopus citations


All ubiquitin-like proteins (UBLs) undergo an activation process before their conjugation to target proteins. Although the steps required for the activation of UBLs are conserved and common to all UBLs, we have previously shown that the activation of the UBL, ubiquitin fold modifier 1 (UFM1) by the E1, Ufm1 modifier-activating enzyme 5 (UBA5) is executed in a trans-binding mechanism, not observed in any other E1. In this study, we explored the necessity of that mechanism for UFM1 activation and found that it is needed not only for UFM1 binding to UBA5 but also for stabilizing the UBA5 homodimer. Although UBA5 functions as a dimer, in solution it behaves as a weak dimer. Dimerization ofUBA5is required for ATP binding; therefore, stabilization of the dimer by UFM1enhances ATP binding. Our results make a connection between the binding ofUFM1toUBA5and the latter's affinity to ATP, so we propose a novel mechanism for the regulation of ATP's binding to E1.

Original languageEnglish
Pages (from-to)2794-2802
Number of pages9
JournalFASEB Journal
Issue number5
StatePublished - May 2018


FundersFunder number
Marie CuriePCIG13-GA-2013-630755
United States-Israel Binational Science Foundation2013261
Israel Science Foundation1383/17


    • Activating enzyme E1
    • Ubiquitin-like protein
    • Ufmylation


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