Article
Glutamate 270 plays an essential role in K(+)-activation and domain closure of Thermus thermophilus isopropylmalate dehydrogenase.
FEBS letters - 16 Jan 2015
Gráczer Éva, Palló Anna, Oláh Julianna, Szimler Tamás, Konarev Petr V, Svergun Dmitri I, Merli Angelo, Závodszky Péter, Weiss Manfred S, Vas Mária
Abstract excerpt
The mutant E270A of Thermus thermophilus 3-isopropylmalate dehydrogenase exhibits largely reduced (∼1%) catalytic activity and negligible activation by K(+) compared to the wild-type enzyme. A 3-4 kcal/mol increase in the activation energy of the catalysed reaction upon this mutation could also be predicted by QM/MM calculations. In the X-ray structure of the E270A mutant a water molecule was observed to take the...
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