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. Author manuscript; available in PMC: 2020 Apr 6.
Published in final edited form as: ACS Catal. 2019 Jul 2;9(8):6955–6961. doi: 10.1021/acscatal.9b02054

Scheme 1. Ergothioneine, Ovothiol Biosynthesis, and Distinct Properties of Sulfoxide Synthase EgtBCtha.

Scheme 1.

a(A) Two aerobic ergothioneine biosynthetic pathways. (B) Ovothiol biosynthetic pathway. (C) Sequence similarity network analysis of ergothioneine sulfoxide synthases and the link between the sulfoxide synthase EgtBCth (in red), Egt1 (in blue), and EgtB (in green). (D) EgtBCth exhibits Egt1- and EgtB-type activities.