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. Author manuscript; available in PMC: 2018 Oct 15.
Published in final edited form as: Arch Biochem Biophys. 2017 Aug 15;632:11–19. doi: 10.1016/j.abb.2017.08.011

Scheme 3.

Scheme 3

TSase mechanisms; a). classical TSase. b). FDTS where serine acts as the nucleophile. c). mechanism for FDTS where hydride of flavin acts as the nucleophile. d). substrate polarization in the active-site of FDTS. e). mechanism that combines c and d to explain the proton exchange at C5 of dUMP. Adapted with permission from Ref. [29].