Cyanobacterial reuse of extracellular organic carbon in microbial mats
Abstract
Cyanobacterial organic matter excretion is crucial to carbon cycling in many microbial communities, but the nature and bioavailability of this C depend on unknown physiological functions. Cyanobacteria-dominated hypersaline laminated mats are a useful model ecosystem for the study of C flow in complex communities, as they use photosynthesis to sustain a more or less closed system. Although such mats have a large C reservoir in the extracellular polymeric substances (EPSs), the production and degradation of organic carbon is not well defined. To identify extracellular processes in cyanobacterial mats, we examined mats collected from Elkhorn Slough (ES) at Monterey Bay, California, for glycosyl and protein composition of the EPS. We found a prevalence of simple glucose polysaccharides containing either α or β (1,4) linkages, indicating distinct sources of glucose with differing enzymatic accessibility. Using proteomics, we identified cyanobacterial extracellular enzymes, and also detected activities that indicate a capacity for EPS degradation. In a less complex system, we characterized the EPS of a cyanobacterial isolate from ES, ESFC-1, and found the extracellular composition of biofilms produced by this unicyanobacterial culture were similar to that of natural mats. By tracing isotopically labeled EPS into single cells of ESFC-1, we demonstrated rapid incorporation ofmore »
- Authors:
-
[1]
- Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States), Physical and Life Sciences Directorate
- NASA Ames Research Center (ARC), Moffett Field, Mountain View, CA (United States), Exobiology Branch
- Publication Date:
- Research Org.:
- Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States); Univ. of Georgia, Athens, GA (United States)
- Sponsoring Org.:
- USDOE
- OSTI Identifier:
- 1623770
- Grant/Contract Number:
- AC52-07NA27344; FG02-93ER20097
- Resource Type:
- Accepted Manuscript
- Journal Name:
- The ISME Journal
- Additional Journal Information:
- Journal Volume: 10; Journal Issue: 5; Journal ID: ISSN 1751-7362
- Publisher:
- Nature Publishing Group
- Country of Publication:
- United States
- Language:
- English
- Subject:
- Environmental Sciences & Ecology; Microbiology
Citation Formats
Stuart, Rhona K., Mayali, Xavier, Lee, Jackson Z., Craig Everroad, R., Hwang, Mona, Bebout, Brad M., Weber, Peter K., Pett-Ridge, Jennifer, and Thelen, Michael P. Cyanobacterial reuse of extracellular organic carbon in microbial mats. United States: N. p., 2015.
Web. doi:10.1038/ismej.2015.180.
Stuart, Rhona K., Mayali, Xavier, Lee, Jackson Z., Craig Everroad, R., Hwang, Mona, Bebout, Brad M., Weber, Peter K., Pett-Ridge, Jennifer, & Thelen, Michael P. Cyanobacterial reuse of extracellular organic carbon in microbial mats. United States. https://doi.org/10.1038/ismej.2015.180
Stuart, Rhona K., Mayali, Xavier, Lee, Jackson Z., Craig Everroad, R., Hwang, Mona, Bebout, Brad M., Weber, Peter K., Pett-Ridge, Jennifer, and Thelen, Michael P. Fri .
"Cyanobacterial reuse of extracellular organic carbon in microbial mats". United States. https://doi.org/10.1038/ismej.2015.180. https://www.osti.gov/servlets/purl/1623770.
@article{osti_1623770,
title = {Cyanobacterial reuse of extracellular organic carbon in microbial mats},
author = {Stuart, Rhona K. and Mayali, Xavier and Lee, Jackson Z. and Craig Everroad, R. and Hwang, Mona and Bebout, Brad M. and Weber, Peter K. and Pett-Ridge, Jennifer and Thelen, Michael P.},
abstractNote = {Cyanobacterial organic matter excretion is crucial to carbon cycling in many microbial communities, but the nature and bioavailability of this C depend on unknown physiological functions. Cyanobacteria-dominated hypersaline laminated mats are a useful model ecosystem for the study of C flow in complex communities, as they use photosynthesis to sustain a more or less closed system. Although such mats have a large C reservoir in the extracellular polymeric substances (EPSs), the production and degradation of organic carbon is not well defined. To identify extracellular processes in cyanobacterial mats, we examined mats collected from Elkhorn Slough (ES) at Monterey Bay, California, for glycosyl and protein composition of the EPS. We found a prevalence of simple glucose polysaccharides containing either α or β (1,4) linkages, indicating distinct sources of glucose with differing enzymatic accessibility. Using proteomics, we identified cyanobacterial extracellular enzymes, and also detected activities that indicate a capacity for EPS degradation. In a less complex system, we characterized the EPS of a cyanobacterial isolate from ES, ESFC-1, and found the extracellular composition of biofilms produced by this unicyanobacterial culture were similar to that of natural mats. By tracing isotopically labeled EPS into single cells of ESFC-1, we demonstrated rapid incorporation of extracellular-derived carbon. Taken together, these results indicate cyanobacteria reuse excess organic carbon, constituting a dynamic pool of extracellular resources in these mats.},
doi = {10.1038/ismej.2015.180},
journal = {The ISME Journal},
number = 5,
volume = 10,
place = {United States},
year = {Fri Oct 23 00:00:00 EDT 2015},
month = {Fri Oct 23 00:00:00 EDT 2015}
}
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