3B5B:
reference: Role of an invariant lysine residue in folate binding on Escherichia coli thymidylate synthase: Calorimetric and crystallographic analysis of the K48Q mutant., Arvizu-Flores AA, Sugich-Miranda R, Arreola R, Garcia-Orozco KD, Velazquez-Contreras EF, Montfort WR, Maley F, Sotelo-Mundo RR, Int J Biochem Cell Biol. 2008;40(10):2206-17. Epub 2008 Mar 6. PMID: 18403248

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