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Hidden Microbial Diversity at High Temperatures

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Hidden Microbial Diversity at High Temperatures Hidden microbial diversity at high temperatures Anna-Louise Reysenbach [email protected] www.alrlab.pdx.edu The microbial world still has a lot of surprises • Genomes – 30-50% coding capacity unknown • Estimates of <1% grown in the lab • High biochemical diversity – Promise for improving processes – Production of high value chemicals/biofuels • Unknown provides ideal targets for discovery using a host of different approaches including creative culturing, metabolic modeling etc. • Consortia/more complex systems are now tractable (& help maintain optimal conditions for production) • Historical- where there is energy, microbes will ‘engineer themselves… Silicon chips, PCBs etc.. Overview: • Generally, what do we know about the diversity in high temp systems? (who are some of the key players? 50- 80C thermophily happens) • Examples of targeting discovery • Any interesting targets out there? – Next wave of pyrosequencing insights • Any conclusions? 1 Kamchatka No close relative in culture, Iceland new genus species New species 2 Costa Rica, new species from Rincon volcano intra-cytoplasmic structures And so on…. 0.5 µm •only explored with undersea vehicles less than 1 % of the mid-oceanic ridge zone which accounts for more than 90 % of the earth's volcanic activity •Yet relatively little is known about microbial diversity (surprising as many of our thermophilic archaeal isolates are from these systems) 3 Emerging patterns of biodiversity Bacteria Dominated by epsilon proteobacteria Uncultivated groups Others, e.g. Aquificales,Thermotogales, Thermales Archaea Methanogens Thermococcales Archaeoglobales Korarchaeota, Nanoarchaeum Uncultured groups--- Deep-sea Hydrothermal Vent Groups, especially, DHVE2 All cultures are neutrophiles, at best acido tolerant or mildly acidophilic (pH 6.0) DHVE2 Uncultivated Archaea For many years we and others asked… • 1. Who are the DHVE2? • 2. Why no acidophiles cultured from deep- sea vents? 4 Major vent sites, and sites where the DHVE2 have been detected •1. Who are the DHVE2? Eastern Lau Spreading Center Lau Vent Fluids Vai Lili Subsurface deposition? [Mg] = 14 – 46 mM Substrate control? Vai Lili [Fouquet et al., 1991] For fluids [Mg] ≤ 3 mM Basalt Basalt/Andesite Andesite Data from TUIM05MV; C.G. Wheat, J. Seewald, M. Mottl, Preliminary Data. 5 Then serendipity enters the search for DHVE2 • Mariner- one of the lowest pH measurements for deep-sea vents pH <2.5 • Clone libraries revealed an unusual sequence from an iron-sulfur-rich microbial mat, 600C • never before detected at vents, related to Picrophilus, Thermoplasma, Ferroplasma Never before detected at vents Could we grow the Thermoplasma-like phylotype? 6 Not yet.. But we have somebody else even more interesting… • The devilheterotrophventblob –DHVE-2 horns - “Aciduliprofundum boonei” Genome has been sequenced. Draft and now being closed by JGI. Second isolate being sequenced too.. Reysenbach et al. 2006. Nature 442:444-447 Reysenbach and Flores, 2008. Geobiology. 6:331-336 Acidic and anaerobic zones 2+ + Fe + 2H2S FeS2 + H2 + 2H + 2+ + Cu + Fe + 2H2S Cu FeS2 + 0.5H2 + 3H 2- + H2S + 2O2 SO4 + 2H S0 Epsilon Proteobacteria Lots of [CHO]n Fe3+, S0 7 MAR08-237A (Rainbow) MAR08-276 (Lucky Strike) MAR08-339 (Lucky Strike) MAR08-361 (Lucky Strike) MAR08-641 (TAG) DQ451875, Aciduliprofundum boonei T469 EPR07-159 (9°N East Pacific Rise) M38637, Thermoplasma acidophilum AF339746, Thermoplasma volcanium X84901, Picrophilus oshimae U20163, Pyrococcus furiosus Z70244, Thermococcus hydrothermalis 0.10 Fig. 2 Neighbor joining tree of cultured representatives of the DHVE2 (colors) based on 1261 unambiguously aligned nucleotides of 16S rRNA gene sequences. Halobacterium salinarum was used as the outgroup to root the tree (not shown). Scale bar represents 10 substitutions per 100 nucleotides. More thermoacidophiles… Deltaproteobacteria 'MAR08-307R_Full_16S' 'MAR08-368R_Full_16S' EP5 Y18292, Hippea maritima KM1 AM712337, uncultured delta proteobacterium Y16943, Desulfurella multipotens Y16942, Desulfurella propionica X72768, Desulfurella acetivorans Y16941, Desulfurella kamchatkensis X99234, Desulfonatronovibrio hydrogenovorans AF524933, Desulfonauticus submarinus AF418177, Desulfobacterium autotrophicum DQ826724, Desulfatibacillus olefinivorans AJ237607, Desulfobacterium indolicum DQ146482, Desulfatirhabdium butyrativorans 0.10 MAR08-307R ≈70 bp MAR08-307R MAR08-368R Hippea maritima “Uncultured delta” “Uncultured delta” ≈100 bp ≈80 bp 8 Overview: • Generally, what do we know about the diversity in high temp systems? (who are some of the key players?) • Examples of targeting discovery • Any interesting targets out there? – Next wave of pyrosequencing insights • Any conclusions? Bacterial 9 Dominated by Caminibacter, Nautiales Epsilons Dominated by Sulfurovum Sulfurimonas or 100 80 60 40 Archaeoglobus Methanocaldococcus 20 0 Desulfurococcales Korarchaeota Pacific Thermococcus DHVE6 Only 1 sample Archaeoglobus dominates 40 #5/6 methanogens dominate with Thermococcus** 35 30 #2 Vulcanisaeta and other Desulfucoccales** 25 20 #7 Desulfurococcales and Thermoproteales 15 10 #2 and 7 Korearchaeota MA R130KM TC126cTC1275 TC126aTC126b 2,5,7,13 Nanoarchaeum 0 Aeropyrum Archaeoglobaceae-unclassified Desulfurococcaceae-unclassified Atlantic DHVE2 Geoglobus Korarchaeota_genera_incertae_sedis Methanococcaceae-unclassified Methanothermococcus Pyrodictiaceae-unclassified Pyrolobus Thermococcus MAR08_13 Thermofilum MAR08_2 MAR08_5 MAR08_7 Vulcan sae a MAR08_5 i t MAR08_13 MAR08_6 MAR08_7 14000 12000 Rare vent Archaea? 10000 8000 6000 4000 2000 0 eoglobi ta;Archa eo ; ea;Euryarcha rmoprotei Archa eota;The renarcha rchaea;C A Archaea;Korarchaeota ;DHVE1 rchaeota aea;Eurya Arch ta;SAGMEG ;Crenarchaeo Archaea ryarchaeota;Methanomicrobia Archaea;Eu Archaea Group II ota;Marine rya rchae haea;Eu rchaeota Arc aea;Eurya Arch eria thanobact eota;Me ryarcha eria rchaea;Eu Halobact A cheaota; a;Euryar 1 Arch ae ta;DHVC TC126c TC126a ;Crenarchaeo TC126a Archaea Archaea TC127 Mar130 KM KM Sulfolobales?! TC126b Picrophilus?! TC126c BacteriaHalophiles too!! 10 Conclusions • Lots of potential targets still in the environment • Understanding the ecology… when and where organisms of interest occur, coexist etc. • Multiple *informed*, coordinated approaches will allow for selective enrichment of metabolisms of interest… • Consortia for novel metabolisms, synthrophy • Low biodiversity systems- meta- transcriptome, proteome Thanks.. Yitai Liu, Gilbert Flores, Mircea Podar NSF, JGI, ICoMM The crew, pilots and scientific parties 11.
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