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  • 1
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    Community proteomics of a natural microbial biofilm (2005)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2005-05-10
    Description: Using genomic and mass spectrometry-based proteomic methods, we evaluated gene expression, identified key activities, and examined partitioning of metabolic functions in a natural acid mine drainage (AMD) microbial biofilm community. We detected 2033 proteins from the five most abundant species in the biofilm, including 48% of the predicted proteins from the dominant biofilm organism, Leptospirillum group II. Proteins involved in protein refolding and response to oxidative stress appeared to be highly expressed, which suggests that damage to biomolecules is a key challenge for survival. We validated and estimated the relative abundance and cellular localization of 357 unique and 215 conserved novel proteins and determined that one abundant novel protein is a cytochrome central to iron oxidation and AMD formation.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Ram, Rachna J -- Verberkmoes, Nathan C -- Thelen, Michael P -- Tyson, Gene W -- Baker, Brett J -- Blake, Robert C 2nd -- Shah, Manesh -- Hettich, Robert L -- Banfield, Jillian F -- New York, N.Y. -- Science. 2005 Jun 24;308(5730):1915-20. Epub 2005 May 5.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Environmental Science, Policy, and Management, University of California at Berkeley, Berkeley, CA 94720, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/15879173" target="_blank"〉PubMed〈/a〉
    Keywords: Amino Acids/metabolism ; Archaeal Proteins/*analysis/chemistry ; Bacteria/chemistry/genetics/*metabolism ; Bacterial Proteins/*analysis/chemistry/genetics/physiology ; *Biofilms/growth & development ; Cytochromes/analysis/chemistry ; *Ecosystem ; Gene Expression ; Genes, Archaeal ; Genes, Bacterial ; Genome, Archaeal ; Genome, Bacterial ; Genomics ; Hydrogen-Ion Concentration ; Iron/metabolism ; Isoelectric Point ; Mass Spectrometry ; *Mining ; Molecular Sequence Data ; Oxidation-Reduction ; Protein Biosynthesis ; Protein Folding ; Proteome ; *Proteomics ; Thermoplasmales/chemistry/genetics/*metabolism
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
    Published by American Association for the Advancement of Science (AAAS)
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  • 2
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    Anaerobic oxidation of methane coupled to nitrate reduction in a novel archaeal lineage (2013)
    Nature Publishing Group (NPG)
    Details
    Publication Date: 2013-07-31
    Description: Anaerobic oxidation of methane (AOM) is critical for controlling the flux of methane from anoxic environments. AOM coupled to iron, manganese and sulphate reduction have been demonstrated in consortia containing anaerobic methanotrophic (ANME) archaea. More recently it has been shown that the bacterium Candidatus 'Methylomirabilis oxyfera' can couple AOM to nitrite reduction through an intra-aerobic methane oxidation pathway. Bioreactors capable of AOM coupled to denitrification have resulted in the enrichment of 'M. oxyfera' and a novel ANME lineage, ANME-2d. However, as 'M. oxyfera' can independently couple AOM to denitrification, the role of ANME-2d in the process is unresolved. Here, a bioreactor fed with nitrate, ammonium and methane was dominated by a single ANME-2d population performing nitrate-driven AOM. Metagenomic, single-cell genomic and metatranscriptomic analyses combined with bioreactor performance and (13)C- and (15)N-labelling experiments show that ANME-2d is capable of independent AOM through reverse methanogenesis using nitrate as the terminal electron acceptor. Comparative analyses reveal that the genes for nitrate reduction were transferred laterally from a bacterial donor, suggesting selection for this novel process within ANME-2d. Nitrite produced by ANME-2d is reduced to dinitrogen gas through a syntrophic relationship with an anaerobic ammonium-oxidizing bacterium, effectively outcompeting 'M. oxyfera' in the system. We propose the name Candidatus 'Methanoperedens nitroreducens' for the ANME-2d population and the family Candidatus 'Methanoperedenaceae' for the ANME-2d lineage. We predict that 'M. nitroreducens' and other members of the 'Methanoperedenaceae' have an important role in linking the global carbon and nitrogen cycles in anoxic environments.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Haroon, Mohamed F -- Hu, Shihu -- Shi, Ying -- Imelfort, Michael -- Keller, Jurg -- Hugenholtz, Philip -- Yuan, Zhiguo -- Tyson, Gene W -- England -- Nature. 2013 Aug 29;500(7464):567-70. doi: 10.1038/nature12375. Epub 2013 Jul 28.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Australian Centre for Ecogenomics, School of Chemistry and Molecular Biosciences, The University of Queensland, Brisbane, Queensland 4072, Australia.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/23892779" target="_blank"〉PubMed〈/a〉
    Keywords: Anaerobiosis ; Archaea/*classification/*metabolism ; Bacteria/classification/metabolism ; Bioreactors ; Metagenome ; Methane/*metabolism ; Nitrates/*metabolism ; Nitrites/metabolism ; Nitrogen Cycle ; Oxidation-Reduction ; Quaternary Ammonium Compounds/metabolism ; Single-Cell Analysis ; Transcriptome
    Print ISSN: 0028-0836
    Electronic ISSN: 1476-4687
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Published by Nature Publishing Group (NPG)
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