{"id":14509,"date":"2020-02-18T15:06:20","date_gmt":"2020-02-18T23:06:20","guid":{"rendered":"https:\/\/www.darkenergybiosphere.org\/?post_type=publication&#038;p=14509"},"modified":"2020-02-18T15:08:30","modified_gmt":"2020-02-18T23:08:30","slug":"validating-the-cyc2-neutrophilic-iron-oxidation-pathway-using-meta-omics-of-zetaproteobacteria-iron-mats-at-marine-hydrothermal-vents","status":"publish","type":"publication","link":"https:\/\/www.darkenergybiosphere.org\/publication\/validating-the-cyc2-neutrophilic-iron-oxidation-pathway-using-meta-omics-of-zetaproteobacteria-iron-mats-at-marine-hydrothermal-vents\/","title":{"rendered":"Validating the Cyc2 Neutrophilic Iron Oxidation Pathway Using Meta-omics of Zetaproteobacteria Iron Mats at Marine Hydrothermal Vents"},"content":{"rendered":"<p><em>Zetaproteobacteria<\/em>\u00a0create extensive iron (Fe) oxide mats at marine hydrothermal vents, making them an ideal model for microbial Fe oxidation at circumneutral pH. Comparison of neutrophilic Fe oxidizer isolate genomes has revealed a hypothetical Fe oxidation pathway, featuring a homolog of the Fe oxidase Cyc2 from\u00a0<em><span id=\"named-content-1\" class=\"named-content genus-species\">Acidithiobacillus ferrooxidans<\/span><\/em>. However, Cyc2 function is not well verified in neutrophilic Fe oxidizers, particularly in Fe-oxidizing environments. Toward this, we analyzed genomes and metatranscriptomes of\u00a0<em>Zetaproteobacteria<\/em>, using 53 new high-quality metagenome-assembled genomes reconstructed from Fe mats at Mid-Atlantic Ridge, Mariana Backarc, and Loihi Seamount (Hawaii) hydrothermal vents. Phylogenetic analysis demonstrated conservation of Cyc2 sequences among most neutrophilic Fe oxidizers, suggesting a common function. We confirmed the widespread distribution of\u00a0<em>cyc2<\/em>\u00a0and other model Fe oxidation pathway genes across all represented\u00a0<em>Zetaproteobacteria<\/em>\u00a0lineages. High expression of these genes was observed in diverse\u00a0<em>Zetaproteobacteria<\/em>\u00a0under multiple environmental conditions and in incubations. The putative Fe oxidase gene\u00a0<em>cyc2<\/em>\u00a0was highly expressed\u00a0<em>in situ<\/em>, often as the top expressed gene. The\u00a0<em>cyc2<\/em>\u00a0gene showed increased expression in Fe(II)-amended incubations, with corresponding increases in carbon fixation and central metabolism gene expression. These results substantiate the Cyc2-based Fe oxidation pathway in neutrophiles and demonstrate its significance in marine Fe-mineralizing environments.<\/p>\n","protected":false},"template":"","tags":[],"publication_type":[19],"_links":{"self":[{"href":"https:\/\/www.darkenergybiosphere.org\/wp-json\/wp\/v2\/publication\/14509"}],"collection":[{"href":"https:\/\/www.darkenergybiosphere.org\/wp-json\/wp\/v2\/publication"}],"about":[{"href":"https:\/\/www.darkenergybiosphere.org\/wp-json\/wp\/v2\/types\/publication"}],"wp:attachment":[{"href":"https:\/\/www.darkenergybiosphere.org\/wp-json\/wp\/v2\/media?parent=14509"}],"wp:term":[{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.darkenergybiosphere.org\/wp-json\/wp\/v2\/tags?post=14509"},{"taxonomy":"publication_type","embeddable":true,"href":"https:\/\/www.darkenergybiosphere.org\/wp-json\/wp\/v2\/publication_type?post=14509"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}