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| 001 | 613873 | ||
| 005 | 20250625123335.0 | ||
| 024 | 7 | _ | |a 10.1038/s41467-023-43624-1 |2 doi |
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| 100 | 1 | _ | |a Arad, Elad |0 0000-0002-0802-0079 |b 0 |
| 245 | _ | _ | |a Staphylococcus aureus functional amyloids catalyze degradation of β-lactam antibiotics |
| 260 | _ | _ | |a [London] |c 2023 |b Nature Publishing Group UK |
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| 520 | _ | _ | |a Antibiotic resistance of bacteria is considered one of the most alarming developments in modern medicine. While varied pathways for bacteria acquiring antibiotic resistance have been identified, there still are open questions concerning the mechanisms underlying resistance. Here, we show that alpha phenol-soluble modulins (PSMαs), functional bacterial amyloids secreted by Staphylococcus aureus, catalyze hydrolysis of β-lactams, a prominent class of antibiotic compounds. Specifically, we show that PSMα2 and, particularly, PSMα3 catalyze hydrolysis of the amide-like bond of the four membered β-lactam ring of nitrocefin, an antibiotic β-lactam surrogate. Examination of the catalytic activities of several PSMα3 variants allowed mapping of the active sites on the amyloid fibrils’ surface, specifically underscoring the key roles of the cross-α fibril organization, and the combined electrostatic and nucleophilic functions of the lysine arrays. Molecular dynamics simulations further illuminate the structural features of β-lactam association upon the fibril surface. Complementary experimental data underscore the generality of the functional amyloid-mediated catalytic phenomenon, demonstrating hydrolysis of clinically employed β-lactams by PSMα3 fibrils, and illustrating antibiotic degradation in actual S. aureus biofilms and live bacteria environments. Overall, this study unveils functional amyloids as catalytic agents inducing degradation of β-lactam antibiotics, underlying possible antibiotic resistance mechanisms associated with bacterial biofilms. |
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| 700 | 1 | _ | |a Pedersen, Kasper B. |b 1 |
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| 700 | 1 | _ | |a Jelinek, Raz |0 0000-0002-0336-1384 |b 9 |e Corresponding author |
| 773 | _ | _ | |a 10.1038/s41467-023-43624-1 |g Vol. 14, no. 1, p. 8198 |0 PERI:(DE-600)2553671-0 |n 1 |p 8198 |t Nature Communications |v 14 |y 2023 |x 2041-1723 |
| 856 | 4 | _ | |y OpenAccess |u https://bib-pubdb1.desy.de/record/613873/files/s41467-023-43624-1.pdf |
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