Download MendeleyStructural analysis of an endogenous 4-megadalton succinyl-CoA-generating metabolon.
Skalidis, I., Kyrilis, F.L., Tuting, C., Hamdi, F., Trager, T.K., Belapure, J., Hause, G., Fratini, M., O'Reilly, F.J., Heilmann, I., Rappsilber, J., Kastritis, P.L.(2023) Commun Biol 6: 552-552
- PubMed: 37217784 Search on PubMedSearch on PubMed Central
- DOI: https://doi.org/10.1038/s42003-023-04885-0
- Primary Citation Related Structures:
8OIU - PubMed Abstract:
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.
- Interdisciplinary Research Center HALOmem, Charles Tanford Protein Center, Martin Luther University Halle-Wittenberg, Kurt-Mothes-Straße 3a, 06120, Halle/Saale, Germany.
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