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• W2018937445 abstract "Proton magnetic resonance studies of 1:1 complexes of E. coli dihydrofolate reductase with folate and methotrexate were performed. A resonance at 1850 Hz in 1:1 enzyme-folate was assigned as the C-7 proton of bound folate by comparison with the spectra of enzyme complexed with folate specifically deuterated at C-7. The first order rate constant for folate dissociation was calculated to be less than 110 sec−1. Four of the five histidine residues exhibited the same pK's and chemical shifts in the two complexes with pK values of 8.0, 7.3, 6.5 and ∼5. However, one histidine increased its pK by 0.7 units (6.25→6.95) and its C-2 proton resonance shifted upfield 50 Hz when folate was substituted for methotrexate. Comparison of these results with those of chemical modification and ultraviolet difference spectroscopy experiments suggests that this histidine may be in the folate binding site — possibly near the pteridine portion of that site." @default.
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• W2018937445 date "1975-11-01" @default.
• W2018937445 modified "2023-09-26" @default.
• W2018937445 title "Dihydrofolate reductase from a methotrexate-resistant Escherichia coli: Proton magnetic resonance studies of complexes with folate and methotrexate" @default.
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• W2018937445 doi "https://doi.org/10.1016/0006-291x(75)90308-3" @default.
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