Presentation Title

Characterization of Hydrogenovibrio sp. SC-1, a Novel Chemolithoautotroph, and a Comparison of Potential Hydrogen, Sulfur, and Iron Metabolism

Faculty Mentor

Roman Barco, Jan Amend

Start Date

18-11-2017 10:00 AM

End Date

18-11-2017 11:00 AM

Location

BSC-Ursa Minor 43

Session

Poster 1

Type of Presentation

Poster

Subject Area

biological_agricultural_sciences

Abstract

A novel microbe, Hydrogenovibrio sp. SC-1, was isolated from in-situ incubated pyrrhotite in surface marine sediments near Catalina Island, California (Barco et al. 2017). Molecular, phylogenetic, and physiological data combined with sequence similarities between SC-1 and its closest relatives supported SC-1 as a novel species. SC-1 is an iron-oxidizer within the Hydrogenovibrio genus, which has been known to contain only hydrogen and sulfur oxidizers; therefore, SC-1 represents a new model organism to study autotrophic iron oxidation within the class Gammaproteobacteria. This also makes Hydrogenovibrio one of only two known marine genera that can sustain life using iron as an energy source to fix carbon. SC-1 is also capable of autotrophic thiosulfate oxidation, and thus represents an organism with a potentially versatile life style in the environment. Optimal temperature and salinity have been revealed to be between 20-25 degrees Celsius and 1.5% NaCl, respectively, yielding a doubling time of < 2 hours, which is far lower than originally reported. SC-1 also prefers circumneutral pH conditions. Metabolic use of ferrous iron and sulfur species such as tetrathionate will be reported to elucidate the alternative energy pathways, and genomic potential for hydrogen oxidation will be presented. Iron oxidation will also be tested in close-relative H. crunogena to further study this unique metabolism within the Gammaproteobacteria. Genomic comparisons and phylogenetic analyses of iron-, sulfur-, and hydrogen-related genes among the Hydrogenovibrio genus and its related genera will be used to further elucidate unique components of these metabolisms.

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Nov 18th, 10:00 AM Nov 18th, 11:00 AM

Characterization of Hydrogenovibrio sp. SC-1, a Novel Chemolithoautotroph, and a Comparison of Potential Hydrogen, Sulfur, and Iron Metabolism

BSC-Ursa Minor 43

A novel microbe, Hydrogenovibrio sp. SC-1, was isolated from in-situ incubated pyrrhotite in surface marine sediments near Catalina Island, California (Barco et al. 2017). Molecular, phylogenetic, and physiological data combined with sequence similarities between SC-1 and its closest relatives supported SC-1 as a novel species. SC-1 is an iron-oxidizer within the Hydrogenovibrio genus, which has been known to contain only hydrogen and sulfur oxidizers; therefore, SC-1 represents a new model organism to study autotrophic iron oxidation within the class Gammaproteobacteria. This also makes Hydrogenovibrio one of only two known marine genera that can sustain life using iron as an energy source to fix carbon. SC-1 is also capable of autotrophic thiosulfate oxidation, and thus represents an organism with a potentially versatile life style in the environment. Optimal temperature and salinity have been revealed to be between 20-25 degrees Celsius and 1.5% NaCl, respectively, yielding a doubling time of < 2 hours, which is far lower than originally reported. SC-1 also prefers circumneutral pH conditions. Metabolic use of ferrous iron and sulfur species such as tetrathionate will be reported to elucidate the alternative energy pathways, and genomic potential for hydrogen oxidation will be presented. Iron oxidation will also be tested in close-relative H. crunogena to further study this unique metabolism within the Gammaproteobacteria. Genomic comparisons and phylogenetic analyses of iron-, sulfur-, and hydrogen-related genes among the Hydrogenovibrio genus and its related genera will be used to further elucidate unique components of these metabolisms.