Archaeal Biofilms: The Great Unexplored

Orell, Alvaro; Fröls, Sabrina; Albers, Sonja‐Verena

doi:10.1146/annurev-micro-092412-155616

Cited by 67 publications

(52 citation statements)

References 104 publications

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“…Cycles of the various elements are intrinsically interconnected, and microbial processes foster this connectivity via the metabolic intersection of different pathways and via functional cooperation between different microbial groups (188). For example, the cooperation of archaeal anaerobic methane oxidation and bacterial sulfate reduction in natural microbial aggregates plays a critical role in coupled marine C and S cycling in anoxic methane-rich environments and thus in the control of ocean methane emissions (189)(190)(191). Particles and biofilms in marine environments provide favorable niches for the coupling of different metabolic pathways and biogeochemical cycles.…”

Section: Physiological Challenges and Deleterious Effects Of Microbiamentioning

confidence: 99%

Microbial Surface Colonization and Biofilm Development in Marine Environments

Dang

Lovell

2016

Microbiol Mol Biol Rev

839

636

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SUMMARYBiotic and abiotic surfaces in marine waters are rapidly colonized by microorganisms. Surface colonization and subsequent biofilm formation and development provide numerous advantages to these organisms and support critical ecological and biogeochemical functions in the changing marine environment. Microbial surface association also contributes to deleterious effects such as biofouling, biocorrosion, and the persistence and transmission of harmful or pathogenic microorganisms and their genetic determinants. The processes and mechanisms of colonization as well as key players among the surface-associated microbiota have been studied for several decades. Accumulating evidence indicates that specific cell-surface, cell-cell, and interpopulation interactions shape the composition, structure, spatiotemporal dynamics, and functions of surface-associated microbial communities. Several key microbial processes and mechanisms, including (i) surface, population, and community sensing and signaling, (ii) intraspecies and interspecies communication and interaction, and (iii) the regulatory balance between cooperation and competition, have been identified as critical for the microbial surface association lifestyle. In this review, recent progress in the study of marine microbial surface colonization and biofilm development is synthesized and discussed. Major gaps in our knowledge remain. We pose questions for targeted investigation of surface-specific community-level microbial features, answers to which would advance our understanding of surface-associated microbial community ecology and the biogeochemical functions of these communities at levels from molecular mechanistic details through systems biological integration.

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Section: Physiological Challenges and Deleterious Effects Of Microbiamentioning

confidence: 99%

Microbial Surface Colonization and Biofilm Development in Marine Environments

Dang

Lovell

2016

Microbiol Mol Biol Rev

839

636

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“…Biofilms are complex microbial communities, bound by a matrix of extracellular polymeric substance (EPS) that allow cells to tolerate stress conditions such as high UV exposure (Hansen et al, 2007;Monds and O'Toole, 2009;Haussler and Fuqua, 2013;Orell et al, 2013a). Once environmental conditions become unfavourable, cells must rapidly transition from a planktonic to a sessile state (McDougald et al, 2011).…”

Section: Introductionmentioning

confidence: 99%

A conserved type IV pilin signal peptide H‐domain is critical for the post‐translational regulation of flagella‐dependent motility

Esquivel

Pohlschröder

2014

Molecular Microbiology

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SummaryIn many bacteria and archaea, type IV pili facilitate surface adhesion, the initial step in biofilm formation. Haloferax volcanii has a specific set of adhesion pilins (PilA1-A6) that, although diverse, contain an absolutely conserved signal peptide hydrophobic (H) domain. Data presented here demonstrate that these pilins (PilA1-A6) also play an important role in regulating flagella-dependent motility, which allows cells to rapidly transition between planktonic and sessile states. Cells lacking adhesion pilins exhibit a severe motility defect, however, expression of any one of the adhesion pilins in trans can rescue the motility and adhesion. Conversely, while deleting pilB3-C3, genes required for PilA pilus biosynthesis, results in cells lacking pili and having an adhesion defect, it does not affect motility, indicating that motility regulation requires the presence of pilins, but not assembled pili. Mutagenesis studies revealed that the pilin-dependent motility regulatory mechanism does not require the diverse C-terminal region of the PilA pilins but specifically involves the conserved H-domain. This novel post-translational regulatory mechanism, which employs components that promote biofilm formation to inhibit motility, can provide a rapid response to changing environmental conditions. A model for this regulatory mechanism, which may also be present in other prokaryotes, is discussed.

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“…Some archaeal groups, e.g., Haloarchaea and Crenarchaea, were demonstrated to be capable of adhering to surfaces to form biofilms (Fröls et al, 2012;Koerdt et al, 2010). The quorum sensing (QS) signals, which regulate the biofilm formation processes of bacterial community, were also reported to coordinate the development of archaeal biofilm (Orell et al, 2013). The carboxylated acyl homoserine lactones (C-AHLs) were used in the QS system of the methanogenic euryarchaea (Zhang et al, 2012).…”

Section: Introductionmentioning

confidence: 99%

Characterization of the archaeal community fouling a membrane bioreactor

Luo

Zhang

Tan

et al. 2015

Journal of Environmental Sciences

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Biofilm formation, one of the primary causes of biofouling, results in reduced membrane flux or increased transmembrane pressure and thus represents a major impediment to the wider implementation of membrane bioreactor (MBR) technologies for water purification. Most studies have focused on the role of bacteria in membrane fouling as they are the most dominant and best studied organisms present in the MBR. In contrast, there is limited information on the role of the archaeal community in biofilm formation in MBRs. This study investigated the composition of the archaeal community during the process of biofouling in an MBR. The archaeal community was observed to have lower richness and diversity in the biofilm than the sludge during the establishment of biofilms at low transmembrane pressure (TMP). Clustering of the communities based on the Bray-Curtis similarity matrix indicated that a subset of the sludge archaeal community formed the initial biofilms. The archaeal community in the biofilm was mainly composed of Thermoprotei, Thermoplasmata, Thermococci, Methanopyri, Methanomicrobia and Halobacteria. Among them, the Thermoprotei and Thermoplasmata were present at higher relative proportions in the biofilms than they were in the sludge. Additionally, the Thermoprotei, Thermoplasmata and Thermococci were the dominant organisms detected in the initial biofilms at low TMP, while as the TMP increased, the Methanopyri, Methanomicrobia, Aciduliprofundum and Halobacteria were present at higher abundances in the biofilms at high TMP.

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Archaeal Biofilms: The Great Unexplored

Cited by 67 publications

References 104 publications

Microbial Surface Colonization and Biofilm Development in Marine Environments

Microbial Surface Colonization and Biofilm Development in Marine Environments

A conserved type IV pilin signal peptide H‐domain is critical for the post‐translational regulation of flagella‐dependent motility

Characterization of the archaeal community fouling a membrane bioreactor

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