Spanish Ministry of Science, Innovation, and Universities
PGC2018-098996-B-100
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ジャーナル: Commun Biol / 年: 2021 タイトル: 3D architecture and structural flexibility revealed in the subfamily of large glutamate dehydrogenases by a mycobacterial enzyme. 著者: Melisa Lázaro / Roberto Melero / Charlotte Huet / Jorge P López-Alonso / Sandra Delgado / Alexandra Dodu / Eduardo M Bruch / Luciano A Abriata / Pedro M Alzari / Mikel Valle / María-Natalia Lisa / 要旨: Glutamate dehydrogenases (GDHs) are widespread metabolic enzymes that play key roles in nitrogen homeostasis. Large glutamate dehydrogenases composed of 180 kDa subunits (L-GDHs) contain long N- ...Glutamate dehydrogenases (GDHs) are widespread metabolic enzymes that play key roles in nitrogen homeostasis. Large glutamate dehydrogenases composed of 180 kDa subunits (L-GDHs) contain long N- and C-terminal segments flanking the catalytic core. Despite the relevance of L-GDHs 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 (mL-GDH) adopts a quaternary structure that is radically different from that of related low molecular weight enzymes. Intersubunit contacts in mL-GDH 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.
全体 : Cryo-EM map of the large glutamate dehydrogenase composed of 180 ...
全体
名称: Cryo-EM map of the large glutamate dehydrogenase composed of 180 kDa subunits from Mycobacterium smegmatis (monomer)
要素
複合体: Cryo-EM map of the large glutamate dehydrogenase composed of 180 kDa subunits from Mycobacterium smegmatis (monomer)
タンパク質・ペプチド: Large Glutamate Dehydrogenase
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超分子 #1: Cryo-EM map of the large glutamate dehydrogenase composed of 180 ...
超分子
名称: Cryo-EM map of the large glutamate dehydrogenase composed of 180 kDa subunits from Mycobacterium smegmatis (monomer) タイプ: complex / ID: 1 / 親要素: 0 / 含まれる分子: all