Abstract
The E28D variant of dihydrofolate reductase from Moritella profunda was generated and found to have the same K i (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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Abbreviations
- DHFR:
-
Dihydrofolate reductase
- MpDHFR:
-
Dihydrofolate reductase from Moritella profunda
- EcDHFR:
-
Dihydrofolate reductase from Escherichia coli
- CD:
-
Circular dichroism
- SDS–PAGE:
-
Sodium dodecyl sulfate polyacrylamide gel electrophoresis
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Acknowledgments
Funding for this work was provided by the UK. Engineering and Physical Sciences Research Council (Doctoral Training Grant to R.M.E.), the Leonardo da Vinci Programme (A.S.) and Cardiff University.
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Loveridge, E.J., Dawson, W.M., Evans, R.M. et al. Reduced Susceptibility of Moritella profunda Dihydrofolate Reductase to Trimethoprim is Not Due to Glutamate 28. Protein J 30, 546–548 (2011). https://doi.org/10.1007/s10930-011-9361-x
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DOI: https://doi.org/10.1007/s10930-011-9361-x