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The extracellular-matrix retaining cyanobacterium Nostoc verrucosum accumulates trehalose but is sensitive to desiccation.
MedLine Citation:
PMID:  21507024     Owner:  NLM     Status:  Publisher    
Abstract/OtherAbstract:
The aquatic cyanobacterium Nostoc verrucosum forms macroscopic colonies, which consist of both cellular filaments and massive extracellular matrix material. In this study, the physiological features of N. verrucosum were investigated and compared with those of the anhydrobiotic cyanobacterium Nostoc commune. N. verrucosum cells were sensitive to desiccation but tolerant of freeze-thawing treatment in terms of both cell viability and photosynthetic O(2) evolution. Natural colonies of these cyanobacteria contained similar levels of chlorophyll a, carotenoids, the UV-absorbing pigments scytonemin and mycosporine-like amino acids (MAA), and uronic acid (a component of extracellular polysaccharides). Extracellular polysaccharides from both N. verrucosum and N. commune indicated low acidity and a high affinity for divalent cations, although their sugar compositions differed. The WspA protein, known to be a major component of the extracellular matrix of N. commune, was detected in N. verrucosum. Desiccation caused similarly high levels of trehalose accumulation in both cyanobacteria. Although previously considered relevant to anhydrobiosis in the terrestrial cyanobacterium N. commune, the data presented here suggest that extracellular matrix production and trehalose accumulation are not enough for standing extreme desiccation in N. verrucosum.
Authors:
Toshio Sakamoto; Keisuke Kumihashi; Shinpei Kunita; Takuya Masaura; Kaori Inoue-Sakamoto; Masaaki Yamaguchi
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Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2011-4-20
Journal Detail:
Title:  FEMS microbiology ecology     Volume:  -     ISSN:  1574-6941     ISO Abbreviation:  -     Publication Date:  2011 Apr 
Date Detail:
Created Date:  2011-4-21     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  8901229     Medline TA:  FEMS Microbiol Ecol     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
Copyright Information:
© 2011 Federation of European Microbiological Societies. Published by Blackwell Publishing Ltd. All rights reserved.
Affiliation:
Division of Biological Sciences, Graduate School of Natural Science and Technology, Kanazawa University. Kakuma, Kanazawa 920-1192, Japan Department of Applied Bioscience, College of Bioscience and Chemistry, Kanazawa Institute of Technology. Ohgigaoka 7-1, Nonoichi-machi 921-8501, Japan.
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