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Dihydrofolate reductase from the deep-sea bacterium Moritella profunda (MpDHFR) has been 13C/15N isotopically labelled and purified. Here, we report the aliphatic 1H, 13C and 15N resonance assignments of MpDHFR in complex with NADP+ and folate. The spectra of MpDHFR suggest considerably greater conformational heterogeneity than is seen in the closely related DHFR from Escherichia coli.
The E28D variant of dihydrofolate reductase from Moritella profunda was generated and found to have the same Ki (within error) for the competitive inhibitor trimethoprim as the wild type enzyme. Contrary to a previous claim in the literature, Glu 28 is therefore not the cause of the reduced affinity for trimethoprim relative to dihydrofolate reductase from Escherichia coli.
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