The role of the Met20 loop in the hydride transfer in Escherichia coli dihydrofolate reductase.

Abstract excerpt

A key question concerning the catalytic cycle of Escherichia coli dihydrofolate reductase (ecDHFR) is whether the Met20 loop is dynamically coupled to the chemical step during catalysis. A more basic, yet unanswered question is whether the Met20 loop adopts a closed conformation during the chemical hydride transfer step. To examine the most likely conformation of the Met20 loop during the chemical step, we...

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