タンパク質・ペプチド: Glutamate synthase (NADPH) large chain
タンパク質・ペプチド: Glutamate synthase (NADPH) small chain
リガンド: FLAVIN MONONUCLEOTIDE
リガンド: FE3-S4 CLUSTER
リガンド: FLAVIN-ADENINE DINUCLEOTIDE
リガンド: IRON/SULFUR CLUSTER
機能・相同性
機能・相同性情報
glutamate synthase activity / oxidoreductase activity, acting on the CH-NH2 group of donors, NAD or NADP as acceptor / glutamate biosynthetic process / glutamate dehydrogenase (NAD+) activity / glutamate catabolic process / 3 iron, 4 sulfur cluster binding / glutamine metabolic process / iron-sulfur cluster binding / nucleotide binding / metal ion binding 類似検索 - 分子機能
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)
GM123159
米国
引用
ジャーナル: Nat Chem Biol / 年: 2022 タイトル: A counter-enzyme complex regulates glutamate metabolism in Bacillus subtilis. 著者: Vijay Jayaraman / D John Lee / Nadav Elad / Shay Vimer / Michal Sharon / James S Fraser / Dan S Tawfik / 要旨: Multi-enzyme assemblies composed of metabolic enzymes catalyzing sequential reactions are being increasingly studied. Here, we report the discovery of a 1.6 megadalton multi-enzyme complex from ...Multi-enzyme assemblies composed of metabolic enzymes catalyzing sequential reactions are being increasingly studied. Here, we report the discovery of a 1.6 megadalton multi-enzyme complex from Bacillus subtilis composed of two enzymes catalyzing opposite ('counter-enzymes') rather than sequential reactions: glutamate synthase (GltAB) and glutamate dehydrogenase (GudB), which make and break glutamate, respectively. In vivo and in vitro studies show that the primary role of complex formation is to inhibit the activity of GudB. Using cryo-electron microscopy, we elucidated the structure of the complex and the molecular basis of inhibition of GudB by GltAB. The complex exhibits unusual oscillatory progress curves and is necessary for both planktonic growth, in glutamate-limiting conditions, and for biofilm growth, in glutamate-rich media. The regulation of a key metabolic enzyme by complexing with its counter enzyme may thus enable cell growth under fluctuating glutamate concentrations.
Real-space refinement involved iterative rounds of ISOLDE, Coot and PHENIX refinement. 1OFD and 6S6T were used as templates for homology modeling in SWISS-MODEL.