9DLF

Arabinosyltransferase AftB in complex with Fab_B3

9DLF の概要

• エントリーDOI: 10.2210/pdb9dlf/pdb
• EMDBエントリー: 46976
• 分子名称: Arabinosyltransferase AftB, Fab_B3 light chain, Fab_B3 heavy chain, ... (4 entities in total)
• 機能のキーワード: arabinosyltransferase, membrane protein
• 由来する生物種: Mycolicibacterium chubuense; 詳細
• タンパク質・核酸の鎖数: 3
• 化学式量合計: 98939.71

構造登録者

Liu, Y.,Mancia, F. (登録日: 2024-09-10, 公開日: 2025-06-25)

主引用文献

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

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: 40301322
DOI: 10.1038/s41467-025-57843-1

実験手法

ELECTRON MICROSCOPY (2.85 Å)