Abstract 2613 Exploring a proton relay mechanism involving Glu28, His273, and Ser26 in the folate half-reaction of E. coli methylenetetrahydrofolate reductase (MTHFR) - Elizabeth Trimmer; Siyuan Du; Carter Wiliams; Maxwell Tetrick; Yuwei Pan; Benjamin Brim; Richard Li; Jason Chien (Journal of Biological Chemistry, 2025)