ジャーナル: Commun Biol / 年: 2023 タイトル: Structural analysis of an endogenous 4-megadalton succinyl-CoA-generating metabolon. 著者: Ioannis Skalidis / Fotis L Kyrilis / Christian Tüting / Farzad Hamdi / Toni K Träger / Jaydeep Belapure / Gerd Hause / Marta Fratini / Francis J O'Reilly / Ingo Heilmann / Juri Rappsilber / ...著者: Ioannis Skalidis / Fotis L Kyrilis / Christian Tüting / Farzad Hamdi / Toni K Träger / Jaydeep Belapure / Gerd Hause / Marta Fratini / Francis J O'Reilly / Ingo Heilmann / Juri Rappsilber / Panagiotis L Kastritis / 要旨: The oxoglutarate dehydrogenase complex (OGDHc) participates in the tricarboxylic acid cycle and, in a multi-step reaction, decarboxylates α-ketoglutarate, transfers succinyl to CoA, and reduces NAD+. ...The oxoglutarate dehydrogenase complex (OGDHc) participates in the tricarboxylic acid cycle and, in a multi-step reaction, decarboxylates α-ketoglutarate, transfers succinyl to CoA, and reduces NAD+. Due to its pivotal role in metabolism, OGDHc enzymatic components have been studied in isolation; however, their interactions within the endogenous OGDHc remain elusive. Here, we discern the organization of a thermophilic, eukaryotic, native OGDHc in its active state. By combining biochemical, biophysical, and bioinformatic methods, we resolve its composition, 3D architecture, and molecular function at 3.35 Å resolution. We further report the high-resolution cryo-EM structure of the OGDHc core (E2o), which displays various structural adaptations. These include hydrogen bonding patterns confining interactions of OGDHc participating enzymes (E1o-E2o-E3), electrostatic tunneling that drives inter-subunit communication, and the presence of a flexible subunit (E3BPo), connecting E2o and E3. This multi-scale analysis of a succinyl-CoA-producing native cell extract provides a blueprint for structure-function studies of complex mixtures of medical and biotechnological value.
使用したクラス数: 50 / 想定した対称性 - 点群: O (正8面体型対称) / アルゴリズム: SIMULTANEOUS ITERATIVE (SIRT) / 解像度のタイプ: BY AUTHOR / 解像度: 3.35 Å / 解像度の算出法: FSC 0.143 CUT-OFF / ソフトウェア - 名称: cryoSPARC (ver. 3.1) / ソフトウェア - 詳細: Local refinement (NEW) 詳細: Particles were symmetry expanded for the final reconstruction, then local reconstruction was performed without symmetry application. 使用した粒子像数: 69028