9MJB
Product-Bound mannosyltransferase PimE in complex with Fab
This is a non-PDB format compatible entry.
Summary for 9MJB
| Entry DOI | 10.2210/pdb9mjb/pdb |
| EMDB information | 46998 |
| Descriptor | Mannosyltransferase, Fab_E6 heavy chain, Fab_E6 light chain, ... (5 entities in total) |
| Functional Keywords | product-bound mannosyltransferase pime in complex with fab, membrane protein |
| Biological source | Mycobacteroides abscessus More |
| Total number of polymer chains | 3 |
| Total formula weight | 73537.54 |
| Authors | |
| Primary citation | Liu, Y.,Brown, C.M.,Borges, N.,Nobre, R.N.,Erramilli, S.,Belcher Dufrisne, M.,Kloss, B.,Giacometti, S.,Esteves, A.M.,Timoteo, C.G.,Tokarz, P.,Cater, R.J.,Lowary, T.L.,Morita, Y.S.,Kossiakoff, A.A.,Santos, H.,Stansfeld, P.J.,Nygaard, R.,Mancia, F. Mechanistic studies of mycobacterial glycolipid biosynthesis by the mannosyltransferase PimE. Nat Commun, 16:3974-3974, 2025 Cited by PubMed Abstract: 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. PubMed: 40301322DOI: 10.1038/s41467-025-57843-1 PDB entries with the same primary citation |
| Experimental method | ELECTRON MICROSCOPY (3.46 Å) |
Structure validation
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