The biofilm matrix scaffold of Ps eudomonas aeruginosa contains G-quadruplex extracellular DNA structures
| Autor: | Yong Hwee Foo, Heather M. Shewan, Anh Tuân Phan, Rémi Castaing, Thomas Seviour, Fernaldo Richtia Winnerdy, Scott A. Rice, Sujatha Subramoni, Lan Li Wong, Sunil S. Adav, Jason R. Stokes, Gurjeet S. Kohli, Sudarsan Mugunthan, Xiangyan Shi, Staffan Kjelleberg |
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| Jazyk: | angličtina |
| Rok vydání: | 2021 |
| Předmět: |
DNA
Bacterial Magnetic Resonance Spectroscopy Base pair Ionic Liquids G-quadruplex Applied Microbiology and Biotechnology Microbiology Article Microbial ecology 03 medical and health sciences chemistry.chemical_compound Extracellular heterocyclic compounds 030304 developmental biology 0303 health sciences 030306 microbiology Extracellular Polymeric Substance Matrix QR100-130 Biofilm Biofilm matrix DNA Environmental Thymine G-Quadruplexes chemistry Biofilms Pseudomonas aeruginosa Biophysics Nucleic acid Pathogens DNA Biotechnology |
| Zdroj: | Seviour, T, Winnerdy, F R, Wong, L L, Shi, X, Mugunthan, S, Foo, Y H, Castaing, R, Adav, S S, Subramoni, S, Kohli, G S, Shewan, H M, Stokes, J R, Rice, S A, Phan, A T & Kjelleberg, S 2021, ' The biofilm matrix scaffold of Ps eudomonas aeruginosa contains G-quadruplex extracellular DNA structures ', npj Biofilms and Microbiomes, vol. 7, no. 1, 27 . https://doi.org/10.1038/s41522-021-00197-5 NPJ Biofilms and Microbiomes npj Biofilms and Microbiomes, Vol 7, Iss 1, Pp 1-12 (2021) |
| Popis: | Extracellular DNA, or eDNA, is recognised as a critical biofilm component; however, it is not understood how it forms networked matrix structures. Here, we isolate eDNA from static-culture Pseudomonas aeruginosa biofilms using ionic liquids to preserve its biophysical signatures of fluid viscoelasticity and the temperature dependency of DNA transitions. We describe a loss of eDNA network structure as resulting from a change in nucleic acid conformation, and propose that its ability to form viscoelastic structures is key to its role in building biofilm matrices. Solid-state analysis of isolated eDNA, as a proxy for eDNA structure in biofilms, reveals non-canonical Hoogsteen base pairs, triads or tetrads involving thymine or uracil, and guanine, suggesting that the eDNA forms G-quadruplex structures. These are less abundant in chromosomal DNA and disappear when eDNA undergoes conformation transition. We verify the occurrence of G-quadruplex structures in the extracellular matrix of intact static and flow-cell biofilms of P. aeruginosa, as displayed by the matrix to G-quadruplex-specific antibody binding, and validate the loss of G-quadruplex structures in vivo to occur coincident with the disappearance of eDNA fibres. Given their stability, understanding how extracellular G-quadruplex structures form will elucidate how P. aeruginosa eDNA builds viscoelastic networks, which are a foundational biofilm property. |
| Databáze: | OpenAIRE |
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