8ADN
Vairimorpha necatrix 20S proteasome from spores
Summary for 8ADN
| Entry DOI | 10.2210/pdb8adn/pdb |
| EMDB information | 15365 |
| Descriptor | Proteasome Inhibitor 31-Like, Proteasome subunit beta type-3, Proteasome subunit beta type-4, ... (15 entities in total) |
| Functional Keywords | peptidase activity, reductive evolution, bound peptide, microsporidia, hydrolase |
| Biological source | Vairimorpha necatrix More |
| Total number of polymer chains | 30 |
| Total formula weight | 757794.99 |
| Authors | Jespersen, N.,Ehrenbolger, K.,Winiger, R.,Svedberg, D.,Vossbrinck, C.R.,Barandun, J. (deposition date: 2022-07-08, release date: 2022-11-23, Last modification date: 2024-10-16) |
| Primary citation | Jespersen, N.,Ehrenbolger, K.,Winiger, R.R.,Svedberg, D.,Vossbrinck, C.R.,Barandun, J. Structure of the reduced microsporidian proteasome bound by PI31-like peptides in dormant spores. Nat Commun, 13:6962-6962, 2022 Cited by PubMed Abstract: Proteasomes play an essential role in the life cycle of intracellular pathogens with extracellular stages by ensuring proteostasis in environments with limited resources. In microsporidia, divergent parasites with extraordinarily streamlined genomes, the proteasome complexity and structure are unknown, which limits our understanding of how these unique pathogens adapt and compact essential eukaryotic complexes. We present cryo-electron microscopy structures of the microsporidian 20S and 26S proteasome isolated from dormant or germinated Vairimorpha necatrix spores. The discovery of PI31-like peptides, known to inhibit proteasome activity, bound simultaneously to all six active sites within the central cavity of the dormant spore proteasome, suggests reduced activity in the environmental stage. In contrast, the absence of the PI31-like peptides and the existence of 26S particles post-germination in the presence of ATP indicates that proteasomes are reactivated in nutrient-rich conditions. Structural and phylogenetic analyses reveal that microsporidian proteasomes have undergone extensive reductive evolution, lost at least two regulatory proteins, and compacted nearly every subunit. The highly derived structure of the microsporidian proteasome, and the minimized version of PI31 presented here, reinforce the feasibility of the development of specific inhibitors and provide insight into the unique evolution and biology of these medically and economically important pathogens. PubMed: 36379934DOI: 10.1038/s41467-022-34691-x PDB entries with the same primary citation |
| Experimental method | ELECTRON MICROSCOPY (2.77 Å) |
Structure validation
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