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-Structure paper
| タイトル | Mechanistic studies of mycobacterial glycolipid biosynthesis by the mannosyltransferase PimE. |
|---|---|
| ジャーナル・号・ページ | Nat Commun, Vol. 16, Issue 1, Page 3974, Year 2025 |
| 掲載日 | 2025年4月29日 |
著者 | Yaqi Liu / Chelsea M Brown / Nuno Borges / Rodrigo N Nobre / Satchal Erramilli / Meagan Belcher Dufrisne / Brian Kloss / Sabrina Giacometti / Ana M Esteves / Cristina G Timóteo / Piotr Tokarz / Rosemary J Cater / Todd L Lowary / Yasu S Morita / Anthony A Kossiakoff / Helena Santos / Phillip J Stansfeld / Rie Nygaard / Filippo Mancia / ![]() |
| PubMed 要旨 | Tuberculosis (TB), a leading cause of death among infectious diseases globally, is caused by Mycobacterium tuberculosis (Mtb). The pathogenicity of Mtb is largely attributed to its complex cell ...Tuberculosis (TB), a leading cause of death among infectious diseases globally, is caused by Mycobacterium tuberculosis (Mtb). The pathogenicity of Mtb is largely attributed to its complex cell envelope, which includes a class of glycolipids called phosphatidyl-myo-inositol mannosides (PIMs). These glycolipids maintain the integrity of the cell envelope, regulate permeability, and mediate host-pathogen interactions. PIMs comprise a phosphatidyl-myo-inositol core decorated with one to six mannose residues and up to four acyl chains. The mannosyltransferase PimE catalyzes the transfer of the fifth PIM mannose residue from a polyprenyl phosphate-mannose (PPM) donor. This step contributes to the proper assembly and function of the mycobacterial cell envelope; however, the structural basis for substrate recognition and the catalytic mechanism of PimE remain poorly understood. Here, we present the cryo-electron microscopy (cryo-EM) structures of PimE from Mycobacterium abscessus in its apo and product-bound form. The structures reveal a distinctive binding cavity that accommodates both donor and acceptor substrates/products. Key residues involved in substrate coordination and catalysis were identified and validated via in vitro assays and in vivo complementation, while molecular dynamics simulations delineated access pathways and binding dynamics. Our integrated approach provides comprehensive insights into PimE function and informs potential strategies for anti-TB therapeutics. |
リンク | Nat Commun / PubMed:40301322 / PubMed Central |
| 手法 | EM (単粒子) |
| 解像度 | 2.85 - 3.46 Å |
| 構造データ | EMDB-46976, PDB-9dlf: EMDB-46978, PDB-9dlh: EMDB-46998, PDB-9dm5: EMDB-46999, PDB-9dm7: |
| 化合物 | ![]() ChemComp-6OU: ![]() PDB-1a7x: ![]() PDB-1a8b: ![]() ChemComp-DSL: |
| 由来 |
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キーワード | MEMBRANE PROTEIN / Arabinosyltransferase / mannosyltransferase / Product-bound Mannosyltransferase PimE in complex with Fab |
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mycolicibacterium chubuense (バクテリア)
homo sapiens (ヒト)
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