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. Author manuscript; available in PMC: 2021 Apr 6.
Published in final edited form as: Angew Chem Int Ed Engl. 2020 Jan 16;59(15):5880–5889. doi: 10.1002/anie.201907662

Figure 6.

Figure 6.

Mechanism of the PSF in the proteasomal active site of iCP to yield an aziridine. Therione (T1) was sulfonylated by PSF, followed by an intramolecular substitution by amine group of T1 to yield an aziridine. Aziridine attack on proximate Lys give a cross-linking product with a net loss of water.