Activation and coupling of the glutaminase and synthase reaction of glutamate synthase is mediated by E1013 of the ferredoxin-dependent enzyme, belonging to loop 4 of the synthase domain.

Abstract excerpt

Crystal structures of glutamate synthase suggested that a conserved glutamyl residue of the synthase domain (E1013 of Synechocystis sp. PCC 6803 ferredoxin-dependent glutamate synthase, FdGltS) may play a key role in activating glutamine binding and hydrolysis and ammonia transfer to the synthase site in this amidotransferase, in response to the ligation and redox state of the synthase site. The E1013D, N, and A,...

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