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Characterization of membrane vesicles secreted by seaweed associated bacterium Alteromonas macleodii KS62
, Prajakta Naval
Published in Elsevier B.V.
2019
PMID: 31053303
Volume: 514
   
Issue: 2
Pages: 422 - 427
Abstract
Recent studies have reported abundant presence of bacterial extracellular membrane vesicles in the marine environment. However, the ecological significance of these bacterial vesicles in the marine environment is only beginning to be explored. In present study, for the first time we report and characterize membrane vesicles secreted by a seaweed associated bacterium, Alteromonas macleodii KS62. Proteomics studies revealed that the vesicle proteome was rich in hydrolytic enzymes (30%) like glycoside hydrolases, proteases, sulphatases, lipases, nucleases and phosphatases. Zymography experiments and enzyme assays established that the vesicles carry active κ-carrageenan degrading enzymes. κ-carrageenan is a major polysaccharide of cell walls of certain red seaweeds like Kappaphycus. Purified membrane vesicles were successfully able to degrade Kappaphycus biomass. Based on these results, we discuss how the hydrolase-rich vesicles may play a role in red seaweed cell wall degradation so that the bacteria can invade and colonise the seaweed biomass establishing a saprophytic lifestyle. We also discuss the role of these vesicles in nutrient acquisition and their ecological significance in the marine environment. © 2019 Elsevier Inc.
About the journal
JournalData powered by TypesetBiochemical and Biophysical Research Communications
PublisherData powered by TypesetElsevier B.V.
ISSN0006291X
Open AccessNo
Concepts (28)
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    CARRAGEENAN
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    Glycosidase
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    Nuclease
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    Phosphatase
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    Proteinase
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    SULFATASE
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    TRIACYLGLYCEROL LIPASE
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    ALTEROMONAS
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    ALTEROMONAS MACLEODII
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    Article
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    Bacterial cell wall
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    BACTERIAL COLONIZATION
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    Bacterial strain
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    Biomass
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    Controlled study
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    Electrospray mass spectrometry
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    Enzyme activity
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    Enzyme release
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    Hydrolysis
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    Marine environment
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    Membrane vesicle
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    Nonhuman
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    Nucleotide sequence
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    Priority journal
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    Proteomics
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    SEAWEED
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    Transmission electron microscopy
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    ZYMOGRAPHY