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. Author manuscript; available in PMC: 2017 May 19.
Published in final edited form as: ChemMedChem. 2015 Feb 10;10(3):490–497. doi: 10.1002/cmdc.201500028

Scheme 1.

Scheme 1

Intermediates formed upon binding of glycine to SHMT; relative absorption maxima are given in parentheses. The quinonoid intermediate accumulates only when a folate ligand is also bound to the enzyme, forming an enzyme–glycine–folate ternary complex. In the scheme, the pyridine ring of the cofactor is indicated by Py.