THE DEEP-SEA BRINES OF THE MEDITERRANEAN SEA : Michail Yakimov and MAMBA Consortium

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THE DEEP-SEA BRINES OF THE MEDITERRANEAN SEA : Michail Yakimov and MAMBA Consortium

MedSea deep brine pools

Origin of MedSea deep brine pools. 1. Messinian salinity crisis

Seawater Upper interface Lower interface Anoxic Highly concentrated Brine H 2 S (2-20 mm) Hypersaline (150-330 ) High pressure (>330 atm) Sediment

Origin of MedSea deep brine pools. Why they are so different?

Origin of MedSea deep brine pools. 2. Different types of evaporites Precipitation of evaporites Bischofite MgCl 2. 6H 2 O Kainite MgSO 4. KCl. 3H 2 O Late stage Carnallite KMgCl 3. H 2 O Kieserite MgSO 4. H 2 O Halite NaCl Anhydrite CaSO 4 Early stage Deposition of evaporites

Origin of MedSea deep brine pools. 3. Evaporation of seawater

Origin of MedSea deep brine pools. 2. Different types of brines Early stage evaporites Late stage evaporites Extreme evaporite conditions Brine of Discovery Basin has the highest salinity ever found in marine environment and one of the most salted ecosystem on our planet. The brine lake, found in December 1993, has the surface area of about 7.5 km 2 and a volume of nearly 2x10 8 m 3

All MedSea deep anoxic basins possess vast unexplored microbial diversity Van der Wielen et al., Science, 2005, 121-3 Daffonchio et al., Nature, 2006, 203-7 Borin et al., PNAS, 2009, 9151-6

Functioning of DHAL ecosystems: understanding the biogeochemical pathways that sustain DHALs microbial metabolic network systems

All MedSea deep anoxic basins possess highly stratified microbial communities How and when these communities were formed?

Surface sediments of Discovery Basin have been in contact with bischofite brine for only 2,000 years. Within this short period the Discovery Basin must have been filled at an average of almost 10,000 m 3 yr -1 (Nature 1997, 387:31-32). Highest limit for cultivation in pure Mg ++ is approx. 1M (Waino et al., Int. J. Syst. Evol. Microbiol., 2000) Highest limit of life in solution of bischofite (MgCl 2 ) is 2.23M (Hallsworth, Yakimov et al. Environm Microbiol, 2007)

In case of deep-sea anoxic hypersaline thalasso- and athalassohaline ecosystems we are facing the existence of peculiar microbial world whose genomic information is yet hidden for us up to now and we cannot go deeper into analysis of functional genes simply because there are no cultivated analogues known. To metagenome or not to metagenome?

Two major metabolic features, fully functional sulfur metabolism and chemolithoautotrophy, detected by amplification and analysis of functional genes, were plotted against metagenome sequencing data to compare the outcomes of these two analytical platforms: SULPHUR METABOLISM OXIDATION --sulfide:quinone reductase SQR (oxidation of sulfide to elemental S0) --fully functional SOX system (sulfite-, thiosulfate-, sulfur- and hydrogen sulfide reduction) REDUCTION --polysulfide (oxido)reductases --dissimilatory sulfite reductases ASSIMILATION (in less extend) --Few sulphate transporters and no ATP-sulfurylases other than of Delta-PB

CO 2 FIXATION 3-HP/4-HB pathway driven by marine Thaumarchaea MGI (acetyl-coa carboxylase, 4-hydroxybutyryl-CoA dehydratase) Reductive pentose phosphate CBB cycle! Gamma-PB (RubisCO, phosphoribulokinases) Reductive citric acid cycle! Epsilon-PB (2-oxoglutarate synthase, ATP-citrate lyase) Reductive acetyl CoA pathway! Euryarchaea (MSBL1?, HC1?, Methanohalophilus?) 5,10-methylenetetrahydromethanopterin reductase, CO dehydrogenase/acetyl-coa synthase complex

DHALs Heterotrophy Methylotrophic methanogenesis using methylamines and/or methyl thiols driven by?methanohalophilus-related archaea Sulphate-, sulfur-reduction and sulphur disproportionation by Delta-, Epsilon-Proteobacteria, Halanaerobium-related bacteria and possibly by members of KB1 candidate division.

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