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. Author manuscript; available in PMC: 2013 Oct 24.
Published in final edited form as: J Am Chem Soc. 2012 Oct 15;134(42):17722–17730. doi: 10.1021/ja307859m

Scheme 1.

Scheme 1

The proposed mechanism for thymidylate synthase (adapted from Ref 23 with permission from ACS). This reaction involves a series of chemical conversions (1–5) with several intermediates (A–D). All the chemical transformations happen at the “chemical reaction site” near the C146 residue (yellow), which forms the only covalent bond between the protein and the substrate during the catalytic turnover.