8P0T image
Entry Detail
PDB ID:
8P0T
EMDB ID:
Keywords:
Title:
CryoEM structure of 20S Trichomonas vaginalis proteasome in complex with proteasome inhibitor CP-17
Biological Source:
Source Organism:
Host Organism:
PDB Version:
Deposition Date:
2023-05-10
Release Date:
2024-05-22
Method Details:
Experimental Method:
Resolution:
2.65 Å
Aggregation State:
PARTICLE
Reconstruction Method:
SINGLE PARTICLE
Macromolecular Entities
Polymer Type:polypeptide(L)
Description:Family T1, proteasome alpha subunit, threonine peptidase
Chain IDs:A, O
Chain Length:241
Number of Molecules:2
Biological Source:Trichomonas vaginalis G3
Polymer Type:polypeptide(L)
Description:Family T1, proteasome alpha subunit, threonine peptidase
Chain IDs:B, P
Chain Length:244
Number of Molecules:2
Biological Source:Trichomonas vaginalis G3
Polymer Type:polypeptide(L)
Description:Proteasome subunit alpha type
Chain IDs:C, Q
Chain Length:251
Number of Molecules:2
Biological Source:Trichomonas vaginalis G3
Polymer Type:polypeptide(L)
Description:Proteasome subunit alpha type
Chain IDs:D, R
Chain Length:235
Number of Molecules:2
Biological Source:Trichomonas vaginalis G3
Polymer Type:polypeptide(L)
Description:Proteasome subunit alpha type
Chain IDs:E, S
Chain Length:251
Number of Molecules:2
Biological Source:Trichomonas vaginalis G3
Polymer Type:polypeptide(L)
Description:Family T1, proteasome alpha subunit, threonine peptidase
Chain IDs:F, T
Chain Length:233
Number of Molecules:2
Biological Source:Trichomonas vaginalis G3
Polymer Type:polypeptide(L)
Description:Family T1, proteasome alpha subunit, threonine peptidase
Chain IDs:G, U
Chain Length:240
Number of Molecules:2
Biological Source:Trichomonas vaginalis G3
Polymer Type:polypeptide(L)
Description:Proteasome subunit beta
Chain IDs:H, V
Chain Length:204
Number of Molecules:2
Biological Source:Trichomonas vaginalis G3
Polymer Type:polypeptide(L)
Description:proteasome endopeptidase complex
Chain IDs:I, W
Chain Length:243
Number of Molecules:2
Biological Source:Trichomonas vaginalis G3
Polymer Type:polypeptide(L)
Description:Proteasome subunit beta
Chain IDs:J, X
Chain Length:206
Number of Molecules:2
Biological Source:Trichomonas vaginalis G3
Polymer Type:polypeptide(L)
Description:Proteasome subunit beta
Chain IDs:K, Y
Chain Length:191
Number of Molecules:2
Biological Source:Trichomonas vaginalis G3
Polymer Type:polypeptide(L)
Description:Proteasome subunit beta
Chain IDs:L, Z
Chain Length:202
Number of Molecules:2
Biological Source:Trichomonas vaginalis G3
Polymer Type:polypeptide(L)
Description:Proteasome subunit beta
Chain IDs:M, AA (auth: a)
Chain Length:241
Number of Molecules:2
Biological Source:Trichomonas vaginalis G3
Polymer Type:polypeptide(L)
Description:Family T1, proteasome beta subunit, threonine peptidase
Chain IDs:N, BA (auth: b)
Chain Length:244
Number of Molecules:2
Biological Source:Trichomonas vaginalis G3
Ligand Molecules
Primary Citation
Structural elucidation of recombinant Trichomonas vaginalis 20S proteasome bound to covalent inhibitors.
Nat Commun 15 8621 8621 (2024)
PMID: 39366995 DOI: 10.1038/s41467-024-53022-w

Abstact

The proteasome is a proteolytic enzyme complex essential for protein homeostasis in mammalian cells and protozoan parasites like Trichomonas vaginalis (Tv), the cause of the most common, non-viral sexually transmitted disease. Tv and other protozoan 20S proteasomes have been validated as druggable targets for antimicrobials. However, low yields and purity of the native proteasome have hindered studies of the Tv 20S proteasome (Tv20S). We address this challenge by creating a recombinant protozoan proteasome by expressing all seven α and seven β subunits of Tv20S alongside the Ump-1 chaperone in insect cells. The recombinant Tv20S displays biochemical equivalence to its native counterpart, confirmed by various assays. Notably, the marizomib (MZB) inhibits all catalytic subunits of Tv20S, while the peptide inhibitor carmaphycin-17 (CP-17) specifically targets β2 and β5. Cryo-electron microscopy (cryo-EM) unveils the structures of Tv20S bound to MZB and CP-17 at 2.8 Å. These findings explain MZB's low specificity for Tv20S compared to the human proteasome and demonstrate CP-17's higher specificity. Overall, these data provide a structure-based strategy for the development of specific Tv20S inhibitors to treat trichomoniasis.

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