Download Mendeley3D architecture and structural flexibility revealed in the subfamily of large glutamate dehydrogenases by a mycobacterial enzyme.
Lazaro, M., Melero, R., Huet, C., Lopez-Alonso, J.P., Delgado, S., Dodu, A., Bruch, E.M., Abriata, L.A., Alzari, P.M., Valle, M., Lisa, M.N.(2021) Commun Biol 4: 684-684
- PubMed: 34083757
- DOI: https://doi.org/10.1038/s42003-021-02222-x
- Primary Citation of Related Structures:
7A1D, 7JSR - PubMed Abstract:
Glutamate dehydrogenases (GDHs) are widespread metabolic enzymes that play key roles in nitrogen homeostasis. Large glutamate dehydrogenases composed of 180 kDa subunits (L-GDHs 180 ) contain long N- and C-terminal segments flanking the catalytic core. Despite the relevance of L-GDHs 180 in bacterial physiology, the lack of structural data for these enzymes has limited the progress of functional studies. Here we show that the mycobacterial L-GDH 180 (mL-GDH 180 ) adopts a quaternary structure that is radically different from that of related low molecular weight enzymes. Intersubunit contacts in mL-GDH 180 involve a C-terminal domain that we propose as a new fold and a flexible N-terminal segment comprising ACT-like and PAS-type domains that could act as metabolic sensors for allosteric regulation. These findings uncover unique aspects of the structure-function relationship in the subfamily of L-GDHs.
Organizational Affiliation:
Center for Cooperative Research in Biosciences (CIC bioGUNE), Basque Research and Technology Alliance (BRTA), Bizkaia Technology Park, Building 801 A, Derio, Spain.
