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© J.M. Ghigo (Institut Pasteur) and Brigite Arbeille (LBC-ME. Faculté de Médecine de Tours)
Colorized scanning electron microscopy of an E. coli biofilm developing on a glass surface
Publication : NPJ biofilms and microbiomes

Lifestyle-specific S-nitrosylation of protein cysteine thiols regulates Escherichia coli biofilm formation and resistance to oxidative stress.

Scientific Fields
Diseases
Organisms
Applications
Technique

Published in NPJ biofilms and microbiomes - 13 Apr 2021

Barraud N*, Létoffé S*, Beloin C, Vinh J, Chiapetta G#, Ghigo JM# (*equal contribution, #co-corresponding authors)

Link to Pubmed [PMID] – 33850153

Link to DOI – 10.1038/s41522-021-00203-w

NPJ Biofilms Microbiomes 2021 Apr; 7(1): 34

Communities of bacteria called biofilms are characterized by reduced diffusion, steep oxygen, and redox gradients and specific properties compared to individualized planktonic bacteria. In this study, we investigated whether signaling via nitrosylation of protein cysteine thiols (S-nitrosylation), regulating a wide range of functions in eukaryotes, could also specifically occur in biofilms and contribute to bacterial adaptation to this widespread lifestyle. We used a redox proteomic approach to compare cysteine S-nitrosylation in aerobic and anaerobic biofilm and planktonic Escherichia coli cultures and we identified proteins with biofilm-specific S-nitrosylation status. Using bacterial genetics and various phenotypic screens, we showed that impairing S-nitrosylation in proteins involved in redox homeostasis and amino acid synthesis such as OxyR, KatG, and GltD altered important biofilm properties, including motility, biofilm maturation, or resistance to oxidative stress. Our study therefore revealed that S-nitrosylation constitutes a physiological basis underlying functions critical for E. coli adaptation to the biofilm environment.

https://pubmed.ncbi.nlm.nih.gov/33850153