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      Extracellular polymeric substances from Shewanella sp. HRCR-1 biofilms: characterization by infrared spectroscopy and proteomics.

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          Abstract

          The composition of extracellular polymeric substances (EPS) from Shewanella sp. HRCR-1 biofilms was investigated using infrared spectroscopy and proteomics to provide insight into potential ecophysiological functions and redox activity of the EPS. Both bound and loosely associated EPS were extracted from Shewanella sp. HRCR-1 biofilms prepared using a hollow-fibre membrane biofilm reactor. Fourier transform infrared spectra revealed the presence of proteins, polysaccharides, nucleic acids, membrane lipids and fatty acids in the EPS fractions. Using a global proteomic approach, a total of 58 extracellular and outer membrane proteins were identified in the EPS. These included homologues of multiple Shewanella oneidensis MR-1 proteins that potentially contribute to key physiological biofilm processes, such as biofilm-promoting protein BpfA, surface-associated serine protease, nucleotidases (CpdB and UshA), an extracellular lipase, and oligopeptidases (PtrB and a M13 family oligopeptidase lipoprotein). In addition, 20 redox proteins were found in extracted EPS. Among the detected redox proteins were the homologues of two S. oneidensis MR-1 c-type cytochromes, MtrC and OmcA, which have been implicated in extracellular electron transfer. Given their detection in the EPS of Shewanella sp. HRCR-1 biofilms, c-type cytochromes may contribute to the possible redox activity of the biofilm matrix and play important roles in extracellular electron transfer reactions.

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          Author and article information

          Journal
          Environ Microbiol
          Environmental microbiology
          Wiley
          1462-2920
          1462-2912
          Apr 2011
          : 13
          : 4
          Affiliations
          [1 ] The Gene and Linda Voiland School of Chemical Engineering and Bioengineering and Center for Environmental, Sediment and Aquatic Research (CESAR), Washington State University, Pullman, WA, USA.
          Article
          10.1111/j.1462-2920.2010.02407.x
          21251176
          199c0f52-2627-490e-a0c6-cc806d89b4cf
          © 2011 Society for Applied Microbiology and Blackwell Publishing Ltd.
          History

          Comments

          added an editorial note to Shewanella

          The extracellular polymeric substance (EPS) of biofilms isvery heterogenous and hard to characterize. In this paper, Cao et al do so for Shewanella, for the first time, providing much needed information for Shewanella biofilm researchers. 

          2016-03-21 13:14 UTC
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