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Title: Role of Caulobacter Cell Surface Structures in Colonization of the Air-Liquid Interface

Abstract

In aquatic environments,Caulobacterspp. can be found at the boundary between liquid and air known as the neuston. I report an approach to study temporal features ofCaulobacter crescentuscolonization and pellicle biofilm development at the air-liquid interface and have defined the role of cell surface structures in this process. At this interface,C. crescentusinitially forms a monolayer of cells bearing a surface adhesin known as the holdfast. When excised from the liquid surface, this monolayer strongly adheres to glass. The monolayer subsequently develops into a three-dimensional structure that is highly enriched in clusters of stalked cells known as rosettes. As this pellicle film matures, it becomes more cohesive and less adherent to a glass surface. A mutant strain lacking a flagellum does not efficiently reach the surface, and strains lacking type IV pili exhibit defects in organization of the three-dimensional pellicle. Strains unable to synthesize the holdfast fail to accumulate at the boundary between air and liquid and do not form a pellicle. Phase-contrast images support a model whereby the holdfast functions to trapC. crescentuscells at the air-liquid boundary. Unlike the holdfast, neither the flagellum nor type IV pili are required forC. crescentusto partition to the air-liquid interface. While it is well establishedmore » that the holdfast enables adherence to solid surfaces, this study provides evidence that the holdfast has physicochemical properties that allow partitioning of nonmotile mother cells to the air-liquid interface and facilitate colonization of this microenvironment. In aquatic environments, the boundary at the air interface is often highly enriched with nutrients and oxygen. Colonization of this niche likely confers a significant fitness advantage in many cases. This study provides evidence that the cell surface adhesin known as a holdfast enablesCaulobacter crescentusto partition to and colonize the air-liquid interface. Additional surface structures, including the flagellum and type IV pili, are important determinants of colonization and biofilm formation at this boundary. Considering that holdfast-like adhesins are broadly conserved inCaulobacterspp. and other members of the diverse classAlphaproteobacteria, these surface structures may function broadly to facilitate colonization of air-liquid boundaries in a range of ecological contexts, including freshwater, marine, and soil ecosystems« less

Authors:
 [1]
  1. Univ. of Chicago, IL (United States); Michigan State Univ., East Lansing, MI (United States)
Publication Date:
Research Org.:
Marine Biological Laboratory, Woods Hole, MA (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Biological and Environmental Research (BER); National Institutes of Health (NIH)
OSTI Identifier:
1623331
Grant/Contract Number:  
SC0016127
Resource Type:
Accepted Manuscript
Journal Name:
Journal of Bacteriology
Additional Journal Information:
Journal Volume: 201; Journal Issue: 18; Related Information: Role of Caulobacter Cell Surface Structures in Colonization of the Air-Liquid InterfaceAretha Fiebig, J Bacteriol, 2019Dynamics and Control of Biofilms of the Oligotrophic Bacterium Caulobacter crescentusJ Bacteriol, 2004Holdfast Formation in Motile Swarmer Cells Optimizes Surface Attachment during Caulobacter crescentus DevelopmentJ Bacteriol, 2005Genomic characteristics of Dickeya fangzhongdai isolates from pear and the function of type IV pili in the chromosomeCHEN et al., Journal of Integrative Agriculture, 2020Direct observation of ultrafast plasmonic hot electron transfer in the strong coupling regimeHangyong Shan et al., Light: Science & Applications, 2019Monitoring work well-being, job confidence and care provided by care home staff using a self-report surveyTim Benson et al., BMJ Open Quality, 2019; Journal ID: ISSN 0021-9193
Publisher:
American Society for Microbiology
Country of Publication:
United States
Language:
English
Subject:
59 BASIC BIOLOGICAL SCIENCES; 54 ENVIRONMENTAL SCIENCES; Alphaproteobacteria; Caulobacter; biofilm; flagellum; holdfast; neuston pellicle type 4 pilus unipolar polysaccharide

Citation Formats

Fiebig, Aretha. Role of Caulobacter Cell Surface Structures in Colonization of the Air-Liquid Interface. United States: N. p., 2019. Web. doi:10.1128/JB.00064-19.
Fiebig, Aretha. Role of Caulobacter Cell Surface Structures in Colonization of the Air-Liquid Interface. United States. https://doi.org/10.1128/JB.00064-19
Fiebig, Aretha. Thu . "Role of Caulobacter Cell Surface Structures in Colonization of the Air-Liquid Interface". United States. https://doi.org/10.1128/JB.00064-19. https://www.osti.gov/servlets/purl/1623331.
@article{osti_1623331,
title = {Role of Caulobacter Cell Surface Structures in Colonization of the Air-Liquid Interface},
author = {Fiebig, Aretha},
abstractNote = {In aquatic environments,Caulobacterspp. can be found at the boundary between liquid and air known as the neuston. I report an approach to study temporal features ofCaulobacter crescentuscolonization and pellicle biofilm development at the air-liquid interface and have defined the role of cell surface structures in this process. At this interface,C. crescentusinitially forms a monolayer of cells bearing a surface adhesin known as the holdfast. When excised from the liquid surface, this monolayer strongly adheres to glass. The monolayer subsequently develops into a three-dimensional structure that is highly enriched in clusters of stalked cells known as rosettes. As this pellicle film matures, it becomes more cohesive and less adherent to a glass surface. A mutant strain lacking a flagellum does not efficiently reach the surface, and strains lacking type IV pili exhibit defects in organization of the three-dimensional pellicle. Strains unable to synthesize the holdfast fail to accumulate at the boundary between air and liquid and do not form a pellicle. Phase-contrast images support a model whereby the holdfast functions to trapC. crescentuscells at the air-liquid boundary. Unlike the holdfast, neither the flagellum nor type IV pili are required forC. crescentusto partition to the air-liquid interface. While it is well established that the holdfast enables adherence to solid surfaces, this study provides evidence that the holdfast has physicochemical properties that allow partitioning of nonmotile mother cells to the air-liquid interface and facilitate colonization of this microenvironment. In aquatic environments, the boundary at the air interface is often highly enriched with nutrients and oxygen. Colonization of this niche likely confers a significant fitness advantage in many cases. This study provides evidence that the cell surface adhesin known as a holdfast enablesCaulobacter crescentusto partition to and colonize the air-liquid interface. Additional surface structures, including the flagellum and type IV pili, are important determinants of colonization and biofilm formation at this boundary. Considering that holdfast-like adhesins are broadly conserved inCaulobacterspp. and other members of the diverse classAlphaproteobacteria, these surface structures may function broadly to facilitate colonization of air-liquid boundaries in a range of ecological contexts, including freshwater, marine, and soil ecosystems},
doi = {10.1128/JB.00064-19},
journal = {Journal of Bacteriology},
number = 18,
volume = 201,
place = {United States},
year = {Thu Aug 22 00:00:00 EDT 2019},
month = {Thu Aug 22 00:00:00 EDT 2019}
}

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