Glutamate dehydrogenases (GDHs) are a broadly distributed group of enzymes that catalyse the reversible oxidative deamination of glutamate to ketoglutarate and ammonia [1]. The structure of GDH from Mycobacterium smegmatis revealed that it has a long N- and C-terminal segments flanking the catalytic core, comprising several domains. The flexible N-terminal domain comprises ACT-like and PAS-type domains which could act as metabolic sensors for allosteric regulation [2]. It also has three helical motifs (HM1-3); this entry represents HM2.

1: A new class of glutamate dehydrogenases (GDH). Biochemical and genetic characterization of the first member, the AMP-requiring NAD-specific GDH of Streptomyces clavuligerus. Minambres B, Olivera ER, Jensen RA, Luengo JM; J Biol Chem 2000;275:39529-39542. PMID:10924516

2: 3D architecture and structural flexibility revealed in the subfamily of large glutamate dehydrogenases by a mycobacterial enzyme. Lazaro M, Melero R, Huet C, Lopez-Alonso JP, Delgado S, Dodu A, Bruch EM, Abriata LA, Alzari PM, Valle M, Lisa MN; Commun Biol. 2021;4:684. PMID:34083757