Transcriptomic and proteomic analyses of Desulfovibrio vulgaris biofilms: Carbon and energy flow contribute to the distinct biofilm growth state
- Miami Univ., Oxford, OH (United States). Dept. of Microbiology; Montana State Univ., Bozeman, MT (United States). Center for Biofilm Engineering; DOE/OSTI
- Univ. of Oklahoma, Norman, OK (United States). Inst. for Environmental Genomics; Environmental Networks Integrated with Molecular Assemblies (http://enigma.lbl.gov/), Bozeman, MT (United States)
- Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Physical Biosciences Division
- Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Physical Biosciences Division; Environmental Networks Integrated with Molecular Assemblies (http://enigma.lbl.gov/), Bozeman, MT (United States)
- Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Physical Biosciences Division; Univ. of California, Berkeley, CA (United States). Dept. of Chemical and Biomolecular Engineering; Univ. of California, Berkeley, CA (United States). Dept. of Bioengineering; Environmental Networks Integrated with Molecular Assemblies (http://enigma.lbl.gov/), Bozeman, MT (United States)
- Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Physical Biosciences Division; Univ. of California, Berkeley, CA (United States). Dept. of Bioengineering; Environmental Networks Integrated with Molecular Assemblies (http://enigma.lbl.gov/), Bozeman, MT (United States)
- Montana State Univ., Bozeman, MT (United States). Center for Biofilm Engineering; Environmental Networks Integrated with Molecular Assemblies (http://enigma.lbl.gov/), Bozeman, MT (United States)
Background: Desulfovibrio vulgaris Hildenborough is a sulfate-reducing bacterium (SRB) that is intensively studied in the context of metal corrosion and heavy-metal bioremediation, and SRB populations are commonly observed in pipe and subsurface environments as surface-associated populations. In order to elucidate physiological changes associated with biofilm growth at both the transcript and protein level, transcriptomic and proteomic analyses were done on mature biofilm cells and compared to both batch and reactor planktonic populations. The biofilms were cultivated with lactate and sulfate in a continuously fed biofilm reactor, and compared to both batch and reactor planktonic populations. Results: The functional genomic analysis demonstrated that biofilm cells were different compared to planktonic cells, and the majority of altered abundances for genes and proteins were annotated as hypothetical (unknown function), energy conservation, amino acid metabolism, and signal transduction. Genes and proteins that showed similar trends in detected levels were particularly involved in energy conservation such as increases in an annotated ech hydrogenase, formate dehydrogenase, pyruvate:ferredoxin oxidoreductase, and rnf oxidoreductase, and the biofilm cells had elevated formate dehydrogenase activity. Several other hydrogenases and formate dehydrogenases also showed an increased protein level, while decreased transcript and protein levels were observed for putative coo hydrogenase as well as a lactate permease and hyp hydrogenases for biofilm cells. Genes annotated for amino acid synthesis and nitrogen utilization were also predominant changers within the biofilm state. Ribosomal transcripts and proteins were notably decreased within the biofilm cells compared to exponential-phase cells but were not as low as levels observed in planktonic, stationary-phase cells. Several putative, extracellular proteins (DVU1012, 1545) were also detected in the extracellular fraction from biofilm cells. Conclusions: Even though both the planktonic and biofilm cells were oxidizing lactate and reducing sulfate, the biofilm cells were physiologically distinct compared to planktonic growth states due to altered abundances of genes/proteins involved in carbon/energy flow and extracellular structures. In addition, average expression values for multiple rRNA transcripts and respiratory activity measurements indicated that biofilm cells were metabolically more similar to exponential-phase cells although biofilm cells are structured differently. The characterization of physiological advantages and constraints of the biofilm growth state for sulfate-reducing bacteria will provide insight into bioremediation applications as well as microbially-induced metal corrosion.
- Research Organization:
- Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC), Biological and Environmental Research (BER). Biological Systems Science Division
- Grant/Contract Number:
- AC02-05CH11231
- OSTI ID:
- 1626414
- Journal Information:
- BMC Genomics, Journal Name: BMC Genomics Journal Issue: 1 Vol. 13; ISSN 1471-2164
- Publisher:
- SpringerCopyright Statement
- Country of Publication:
- United States
- Language:
- English
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Wed Aug 01 00:00:00 EDT 2007
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OSTI ID:921258
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Thu Jun 09 00:00:00 EDT 2011
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OSTI ID:1015868
Identification of Molecular and Cellular Responses of Desulfovibrio vulgaris Biofilms under Culture Conditions Relevant to Field Conditions for Bioreduction
Technical Report
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Thu Jun 01 00:00:00 EDT 2006
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OSTI ID:896800