AUTHOR=Murillo Alejandro A. , Ramírez-Flandes Salvador , DeLong Edward F. , Ulloa Osvaldo TITLE=Enhanced metabolic versatility of planktonic sulfur-oxidizing γ-proteobacteria in an oxygen-deficient coastal ecosystem JOURNAL=Frontiers in Marine Science VOLUME=1 YEAR=2014 URL=https://www.frontiersin.org/journals/marine-science/articles/10.3389/fmars.2014.00018 DOI=10.3389/fmars.2014.00018 ISSN=2296-7745 ABSTRACT=
Sulfur-oxidizing γ-proteobacteria are abundant in marine oxygen-deficient waters, and appear to play a key role in a previously unrecognized cryptic sulfur cycle. Metagenomic analyses of members of the uncultured SUP05 lineage in the Canadian seasonally anoxic fjord Saanich Inlet (SI), hydrothermal plumes in the Guaymas Basin (GB) and single cell genomics analysis of two ARCTIC96BD-19 representatives from the South Atlantic Sub-Tropical Gyre (SASG) have shown them to be metabolically versatile. However, SI and GB SUP05 bacteria seem to be obligate chemolithoautotrophs, whereas ARCTIC96BD-19 has the genetic potential for aerobic respiration. Here, we present results of a metagenomic analysis of sulfur-oxidizing γ-proteobacteria (GSO), closely related to the SUP05/ARCTIC96BD-19 clade, from a coastal ecosystem in the eastern South Pacific (ESP). This ecosystem experiences seasonal anoxia and accumulation of nitrite and ammonium at depth, with a corresponding increase in the abundance of GSO representatives. The ESP-GSOs appear to have a significantly different gene complement than those from SI, GB, and SASG. Genomic analyses of