Enrichment of Marinobacter sp. and Halophilic Homoacetogens at the Biocathode of Microbial Electrosynthesis System Inoculated With Red Sea Brine Pool

Abstract

Homoacetogens are efficient CO2 fixing bacteria using H2 as electron donor to produce acetate. These organisms can be enriched at the biocathode of microbial electrosynthesis (MES) for electricity-driven CO2 reduction to acetate. Studies exploring homoacetogens in MES are mainly conducted using pure or mix-culture anaerobic inocula from samples with standard environmental conditions. Extreme marine environments host unique microbial communities including homoacetogens that may have unique capabilities due to their adaptation to harsh environmental conditions. Anaerobic deep-sea brine pools are hypersaline and metalliferous environments and homoacetogens can be expected to live in these environments due to their remarkable metabolic flexibility and energy-efficient biosynthesis. However, brine pools have never been explored as inocula for the enrichment of homacetogens in MES. Here we used the saline water from a Red Sea brine pool as inoculum for the enrichment of halophilic homoacetogens at the biocathode (−1 V vs. Ag/AgCl) of MES. Volatile fatty acids, especially acetate, along with hydrogen gas were produced in MES systems operated at 25 and 10% salinity. Acetate concentration increased when MES was operated at a lower salinity ∼3.5%, representing typical seawater salinity. Amplicon sequencing and genome-centric metagenomics of matured cathodic biofilm showed dominance of the genus Marinobacter and phylum Firmicutes at all tested salinities. Seventeen high-quality draft metagenome-assembled genomes (MAGs) were extracted from the biocathode samples. The recovered MAGs accounted for 87 ± 4% of the quality filtered sequence reads. Genome analysis of the MAGs suggested CO2 fixation via Wood–Ljundahl pathway by members of the phylum Firmicutes and the fixed CO2 was possibly utilized by Marinobacter sp. for growth by consuming O2 escaping from the anode to the cathode for respiration. The enrichment of Marinobacter sp. with homoacetogens was only possible because of the specific cathodic environment in MES. These findings suggest that in organic carbon-limited saline environments, Marinobacter spp. can live in consortia with CO2 fixing bacteria such as homoacetogens, which can provide them with fixed carbon as a source of carbon and energy.

Microbial Electrosynthesis: Where Do We Go from Here?

“…As an extra advantage, higher salt concentration may even induce biofilm formation, as shown for Clostridium ljungdahlii via NaCl addition [47]. Alqahtani and colleagues recently enriched a halophilic homoacetogen culture from a hypersaline deep Red sea brine pool [48]. Their culture was capable of reducing CO 2 to acetate at 3.5% NaCl, though at low current densities.…”

Response of Two Wheat Varieties to Salt Stress of Newly Reclaimed Soil in Upper Egypt

“…Data, Also, Revealed that the salttolerant plants (Sids1) were more by the different amelioration techniques in studied soil under salinity stress conditions. mainly due to avoid Na toxicity of salinity particularly what concerning effects on metabolic processes, as well as ionic imbalance which reflected on water balance causing " physiological drought " Alqahtani, et al, (2019). Differences exist between plant species in their tolerance of salinity can be related to the salt content in the soil and/or water which causes an initial decline in growth (yield), and also to the rate of yield decline that occurs with increasing salinity.…”

Resistance assessment of microbial electrosynthesis for biochemical production to changes in delivery methods and CO2 flow rates

“…To obtain operational taxonomic unit (OTU) abundances for further statistical analysis, the bioinformatic processing of the forward and reverse 16S rRNA amplicon reads was conducted following the same procedures reported in a previous study (Alqahtani et al, 2019).…”