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A model flavin possessing a specific hydrogen bond to the N1-position has been synthesized. The redox potential has been measured in aqueous buffer and found to be shifted +21 mV as compared to a similar flavin lacking this hydrogen bond. The reaction of the N1-hydrogen-bonding model with sulfite and 1-benzyl-dihydronicotinamide were examined and compared with the non-hydrogen-bonded flavin. The N1-hydrogen bond did not accelerate the rate of sulfite ion or hydride addition to N5, however the N5-sulfite complex was stabilized by nearly 4-fold over a non-hydrogen-bonding model. The model flavins were also studied computationally.
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Released October 22, 2019