Crystal structure of a chimaeric bacterial glutamate dehydrogenase.
Glutamate dehydrogenases (EC 1.4.1.2-4) catalyse the oxidative deamination of L-glutamate to α-ketoglutarate using NAD(P)(+) as a cofactor. The bacterial enzymes are hexameric, arranged with 32 symmetry, and each polypeptide consists of an N-terminal substrate-binding segment (domain I) followed by a C-terminal cofactor-binding segment (domain II). The catalytic reaction takes place in the cleft formed at the junction of the two domains. Distinct signature sequences in the nucleotide-binding domain have been linked to the binding of NAD(+) versus NADP(+), but they are not unambiguous predictors of cofactor preference. In the absence of substrate, the two domains move apart as rigid bodies, as shown by the apo structure of glutamate dehydrogenase from Clostridium symbiosum. Here, the crystal structure of a chimaeric clostridial/Escherichia coli enzyme has been determined in the apo state. The enzyme is fully functional and reveals possible determinants of interdomain flexibility at a hinge region following the pivot helix. The enzyme retains the preference for NADP(+) cofactor from the parent E. coli domain II, although there are subtle differences in catalytic activity.
School of Biochemistry and Immunology, Trinity College Dublin, Dublin 2, Ireland.
Tânia
T
Oliveira
School of Biomolecular and Biomedical Science, Conway Institute, University College Dublin, Belfield, Dublin 4, Ireland.
Michael A
MA
Sharkey
School of Biomolecular and Biomedical Science, Conway Institute, University College Dublin, Belfield, Dublin 4, Ireland.
Paul C
PC
Engel
School of Biochemistry and Immunology, Trinity College Dublin, Dublin 2, Ireland.
Amir R
AR
Khan
D001419:Bacteria / Q000201:enzymology*; D005969:Glutamate Dehydrogenase / Q000378:metabolism*; D011487:Protein Conformation
D005969:Glutamate Dehydrogenase
NADP+-binding domain; catalysis; chimaera; enzyme; glutamate dehydrogenase