Nonclassical Biofilms Induced by DNA Breaks in <named-content content-type="genus-species">Klebsiella pneumoniae</named-content>

ABSTRACT Biofilms usually form when the density of bacteria increases during the middle to late periods of growth in culture, commonly induced by quorum-sensing systems. Biofilms attach to the surfaces of either living or nonliving objects and protect bacteria against antibiotics and a host’s immune...

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Autores principales:	Yan Liu, Chao Pan, Lijun Ye, Yue Si, Changhao Bi, Xiaoting Hua, Yunsong Yu, Li Zhu, Hengliang Wang
Formato:	article
Lenguaje:	EN
Publicado:	American Society for Microbiology 2020
Materias:	Klebsiella pneumoniae biofilm Cas9 double-strand break Microbiology QR1-502
Acceso en línea:	https://doaj.org/article/df34a7b95dc948f184016311122ef599
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spelling	oai:doaj.org-article:df34a7b95dc948f184016311122ef5992021-11-15T15:30:16ZNonclassical Biofilms Induced by DNA Breaks in <named-content content-type="genus-species">Klebsiella pneumoniae</named-content>10.1128/mSphere.00336-202379-5042https://doaj.org/article/df34a7b95dc948f184016311122ef5992020-06-01T00:00:00Zhttps://journals.asm.org/doi/10.1128/mSphere.00336-20https://doaj.org/toc/2379-5042ABSTRACT Biofilms usually form when the density of bacteria increases during the middle to late periods of growth in culture, commonly induced by quorum-sensing systems. Biofilms attach to the surfaces of either living or nonliving objects and protect bacteria against antibiotics and a host’s immune system. Here, a novel type of biofilm (the “R-biofilm”) is reported. These biofilms were formed by clinically isolated Klebsiella pneumoniae strains following double-stranded-DNA breaks (DSBs), while undamaged bacteria did not form classic biofilms even in the later stages of growth. R-biofilms had a fixed ring-like or discoid shape with good ductility and could protect many living bacterial cells within. We show that extracellular proteins and DNAs released, probably by dead bacteria, were the core structural materials of R-biofilms. We anticipate that novel signaling pathways besides the bacterial SOS response are involved in R-biofilm formation. The observations in this study suggest a limitation to the use of the currently popular Cas9-mediated bactericidal tools to eliminate certain bacteria because the resulting DSBs may lead to the formation of these protective R-biofilms. IMPORTANCE Many pathogenic bacteria can form biofilm matrices that consist of complex molecules such as polysaccharides, proteins, and DNA. These biofilms help the bacteria to infect and colonize a host. Such biofilms may attach and develop on the surfaces of indwelling medical devices or other supportive environments. This study found that following double-strand breaks in their DNA, Klebsiella pneumoniae cells can form a novel type of biofilm with ring-like or discoid morphology. This biofilm structure, named the “R-biofilm,” helps protect the bacteria against adverse conditions such as exposure to ethanol, hydrogen peroxide, and UV radiation.Yan LiuChao PanLijun YeYue SiChanghao BiXiaoting HuaYunsong YuLi ZhuHengliang WangAmerican Society for MicrobiologyarticleKlebsiella pneumoniaebiofilmCas9double-strand breakMicrobiologyQR1-502ENmSphere, Vol 5, Iss 3 (2020)
institution	DOAJ
collection	DOAJ
language	EN
topic	Klebsiella pneumoniae biofilm Cas9 double-strand break Microbiology QR1-502
spellingShingle	Klebsiella pneumoniae biofilm Cas9 double-strand break Microbiology QR1-502 Yan Liu Chao Pan Lijun Ye Yue Si Changhao Bi Xiaoting Hua Yunsong Yu Li Zhu Hengliang Wang Nonclassical Biofilms Induced by DNA Breaks in <named-content content-type="genus-species">Klebsiella pneumoniae</named-content>
description	ABSTRACT Biofilms usually form when the density of bacteria increases during the middle to late periods of growth in culture, commonly induced by quorum-sensing systems. Biofilms attach to the surfaces of either living or nonliving objects and protect bacteria against antibiotics and a host’s immune system. Here, a novel type of biofilm (the “R-biofilm”) is reported. These biofilms were formed by clinically isolated Klebsiella pneumoniae strains following double-stranded-DNA breaks (DSBs), while undamaged bacteria did not form classic biofilms even in the later stages of growth. R-biofilms had a fixed ring-like or discoid shape with good ductility and could protect many living bacterial cells within. We show that extracellular proteins and DNAs released, probably by dead bacteria, were the core structural materials of R-biofilms. We anticipate that novel signaling pathways besides the bacterial SOS response are involved in R-biofilm formation. The observations in this study suggest a limitation to the use of the currently popular Cas9-mediated bactericidal tools to eliminate certain bacteria because the resulting DSBs may lead to the formation of these protective R-biofilms. IMPORTANCE Many pathogenic bacteria can form biofilm matrices that consist of complex molecules such as polysaccharides, proteins, and DNA. These biofilms help the bacteria to infect and colonize a host. Such biofilms may attach and develop on the surfaces of indwelling medical devices or other supportive environments. This study found that following double-strand breaks in their DNA, Klebsiella pneumoniae cells can form a novel type of biofilm with ring-like or discoid morphology. This biofilm structure, named the “R-biofilm,” helps protect the bacteria against adverse conditions such as exposure to ethanol, hydrogen peroxide, and UV radiation.
format	article
author	Yan Liu Chao Pan Lijun Ye Yue Si Changhao Bi Xiaoting Hua Yunsong Yu Li Zhu Hengliang Wang
author_facet	Yan Liu Chao Pan Lijun Ye Yue Si Changhao Bi Xiaoting Hua Yunsong Yu Li Zhu Hengliang Wang
author_sort	Yan Liu
title	Nonclassical Biofilms Induced by DNA Breaks in <named-content content-type="genus-species">Klebsiella pneumoniae</named-content>
title_short	Nonclassical Biofilms Induced by DNA Breaks in <named-content content-type="genus-species">Klebsiella pneumoniae</named-content>
title_full	Nonclassical Biofilms Induced by DNA Breaks in <named-content content-type="genus-species">Klebsiella pneumoniae</named-content>
title_fullStr	Nonclassical Biofilms Induced by DNA Breaks in <named-content content-type="genus-species">Klebsiella pneumoniae</named-content>
title_full_unstemmed	Nonclassical Biofilms Induced by DNA Breaks in <named-content content-type="genus-species">Klebsiella pneumoniae</named-content>
title_sort	nonclassical biofilms induced by dna breaks in <named-content content-type="genus-species">klebsiella pneumoniae</named-content>
publisher	American Society for Microbiology
publishDate	2020
url	https://doaj.org/article/df34a7b95dc948f184016311122ef599
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Nonclassical Biofilms Induced by DNA Breaks in <named-content content-type="genus-species">Klebsiella pneumoniae</named-content>

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