6dfk

Crystal structure of the 11S subunit of the Plasmodium falciparum proteasome, PA28

spinqualitylabelsall models 6dfk, resolution 3.10Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 6dfk is a 14 chain structure with sequence from Plasmodium falciparum 3D7. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Method: X-ray diffraction, Resolution 3.1Å Ligands: SO4 Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function Q8I374_PLAF7 Publication Abstract from PubMed The activity of the proteasome 20S catalytic core is regulated by protein complexes that bind to one or both ends. The PA28 regulator stimulates 20S proteasome peptidase activity in vitro, but its role in vivo remains unclear. Here, we show that genetic deletion of the PA28 regulator from Plasmodium falciparum (Pf) renders malaria parasites more sensitive to the antimalarial drug dihydroartemisinin, indicating that PA28 may play a role in protection against proteotoxic stress. The crystal structure of PfPA28 reveals a bell-shaped molecule with an inner pore that has a strong segregation of charges. Small-angle X-ray scattering shows that disordered loops, which are not resolved in the crystal structure, extend from the PfPA28 heptamer and surround the pore. Using single particle cryo-electron microscopy, we solved the structure of Pf20S in complex with one and two regulatory PfPA28 caps at resolutions of 3.9 and 3.8 A, respectively. PfPA28 binds Pf20S asymmetrically, strongly engaging subunits on only one side of the core. PfPA28 undergoes rigid body motions relative to Pf20S. Molecular dynamics simulations support conformational flexibility and a leaky interface. We propose lateral transfer of short peptides through the dynamic interface as a mechanism facilitating the release of proteasome degradation products. The structure of the PA28-20S proteasome complex from Plasmodium falciparum and implications for proteostasis.,Xie SC, Metcalfe RD, Hanssen E, Yang T, Gillett DL, Leis AP, Morton CJ, Kuiper MJ, Parker MW, Spillman NJ, Wong W, Tsu C, Dick LR, Griffin MDW, Tilley L Nat Microbiol. 2019 Aug 5. pii: 10.1038/s41564-019-0524-4. doi:, 10.1038/s41564-019-0524-4. PMID:31384003 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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