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-Structure paper
タイトル | Structural elucidation of recombinant Trichomonas vaginalis 20S proteasome bound to covalent inhibitors. |
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ジャーナル・号・ページ | Nat Commun, Vol. 15, Issue 1, Page 8621, Year 2024 |
掲載日 | 2024年10月4日 |
![]() | Jan Silhan / Pavla Fajtova / Jitka Bartosova / Brianna M Hurysz / Jehad Almaliti / Yukiko Miyamoto / Lars Eckmann / William H Gerwick / Anthony J O'Donoghue / Evzen Boura / ![]() ![]() |
PubMed 要旨 | 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 ...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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手法 | EM (単粒子) |
解像度 | 2.65 - 2.89 Å |
構造データ | EMDB-16901, PDB-8oix: EMDB-17337, PDB-8p0t: |
化合物 | ![]() ChemComp-SA1: ![]()
ChemComp-X5C: |
由来 |
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![]() | HYDROLASE / Proteasome / 20S / Trichomonas vaginalis / covalently bound Salinosporamide A / Marizomib / covalently bound protease inhibitor CP-17 |