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. Author manuscript; available in PMC: 2019 Feb 7.
Published in final edited form as: Biochemistry. 2017 Feb 7;56(7):986–996. doi: 10.1021/acs.biochem.6b01093

Scheme 3.

Scheme 3

Mechanism postulated for SQOR by Libiad et al.1 and the corresponding rate equation (eq. 5) for the reaction in the presence of a single sulfane sulfur acceptor, X. CoQ = CoQ1. For this mechanism, k3,x = kcat,x and k2,x = kcat,x/Km,x