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- Title
Whole-cell-based identification of electrochemically active bacteria in microbial fuel cells by matrix-assisted laser desorption/ionization time-of-flight mass spectrometry.
- Authors
Zhang, Lijuan; Gao, Yan; Lai, Linke; Li, Sam Fong Yau
- Abstract
Rationale Electrochemically active bacteria (EAB) that are capable of producing electricity from renewable biomass and organic wastes have been of particular interest in recent years. Methods for selective enrichment, accurate identification and easy acquisition of EAB fingerprints for phylogenetic characterization would facilitate utilization of these bioenergy-producing species in practical environmental engineering applications. Methods Electricigens/exoelectrogens were selectively enriched from domestic wastewater in a microbial fuel cell (MFC). Whole EAB cell-derived mass spectra were obtained with simple agar incubation for 24 h and subsequent release of proteins by 25% formic acid (FA) and ultrasonication. Mass fingerprints of EAB were obtained by matrix-assisted laser desorption/ionization time-of-flight mass spectrometry (MALDI-TOF/TOF-MS) and species-specific analyses were completed by using the Spectral ARchive and Microbial Identification System (SARAMIS). Results EAB could be discriminated by clustering of MALDI-TOF/TOF-MS results. Different species in mixtures originating from domestic sewage could be identified unambiguously at 99.90% confidence. Five species, namely Klebsiella oxytoca ( K. oxytoca), Comamonas testosterone ( C. testosterone), Pseudomonas putida ( P. putida), Klebsiella pneumonia ( K. pneumonia) and Raoultella ornithinolytica ( R. ornithinolytica), that are known to be of clinical significance, were found to be enriched in MFCs and determined as high power-producing species. By using an agglomerative clustering algorithm to compute spectral similarity and diversity, a dendrogram was constructed to illustrate the phylogenetic relationships for EAB on the basis of mass spectral analyses. Conclusions An integrated method based on MFC-enrichment, agar-cultivation and MALDI-TOF/TOF-MS identification of whole-cell-extracted proteins has been proved to be a simple, rapid and reliable approach for rapid identification and routine inspection of EAB. Mixed phyla can be analyzed at species level to provide phylogenetic information on the highly efficient bacteria generating electricity from domestic wastewater. Copyright © 2015 John Wiley & Sons, Ltd.
- Subjects
BACTERIA; MICROBIAL fuel cells; BIOMASS energy; ORGANIC wastes; MASS spectrometry; PHYLOGENY
- Publication
Rapid Communications in Mass Spectrometry: RCM, 2015, Vol 29, Issue 23, p2211
- ISSN
0951-4198
- Publication type
Article
- DOI
10.1002/rcm.7387