9G17
Structure of PslG with a covalently- bound pentasaccharide
Summary for 9G17
| Entry DOI | 10.2210/pdb9g17/pdb |
| Descriptor | PslG, alpha-D-mannopyranose-(1-2)-beta-D-mannopyranose-(1-3)-beta-D-mannopyranose-(1-3)-alpha-L-rhamnopyranose-(1-3)-(1R,2S,4S,5R)-6-(hydroxymethyl)cyclohexane-1,2,3,4,5-pentol, CHLORIDE ION, ... (6 entities in total) |
| Functional Keywords | endo-glucanase, activity-based probe, epoxide, hydrolase |
| Biological source | Pseudomonas aeruginosa |
| Total number of polymer chains | 1 |
| Total formula weight | 48889.37 |
| Authors | Offen, W.A.,Davies, G.J. (deposition date: 2024-07-09, release date: 2025-03-05, Last modification date: 2025-03-26) |
| Primary citation | Ruijgrok, G.,Offen, W.A.,Pickles, I.B.,Raju, D.,Patsos, T.,de Boer, C.,Ofman, T.,Rompa, J.,van Oord, D.,Dodson, E.J.,Beekers, A.,Voskuilen, T.,Ferrari, M.,Wu, L.,Janssen, A.P.A.,Codee, J.D.C.,Howell, P.L.,Davies, G.J.,Overkleeft, H.S. Bespoke Activity-Based Probes Reveal that the Pseudomonas aeruginosa Endoglycosidase, PslG, Is an Endo-beta-glucanase. J.Am.Chem.Soc., 147:8578-8586, 2025 Cited by PubMed Abstract: During infection, the human opportunistic pathogen Pseudomonas aeruginosa forms protective biofilms, whose matrix consists of proteins, nucleic acids, and polysaccharides such as alginate, Psl, and Pel. Psl, a polymeric pentasaccharide composed of mannose, rhamnose, and glucose, is produced during the early stages of biofilm formation, serving as a protective barrier against antibiotics and the immune system. The Psl biosynthesis gene cluster, besides encoding various glycosyltransferases, also includes an endoglycosidase, PslG. Here, we show, by activity-based protein profiling, structural studies on enzyme-inhibitor complexes, and defined substrate processing, that PslG is not, as previously suggested, an endo-β-mannosidase but instead a retaining endo-β-glucosidase. This insight allows the design of both competitive and covalent PslG inhibitors, as we show for repeating pentasaccharide mimetics featuring either a reducing end deoxynojirimycin or cyclophellitol moiety. This work provides valuable tools to deepen the understanding of Psl biosynthesis, its function in biofilm formation, and its contribution to antibiotic resistance. We demonstrate the enzyme's actual endo-β-glucosidase activity, a means to monitor PslG activity in biofilms, and a blueprint for inhibitor design. PubMed: 39999423DOI: 10.1021/jacs.4c16806 PDB entries with the same primary citation |
| Experimental method | X-RAY DIFFRACTION (1.55 Å) |
Structure validation
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