1887

Abstract

A hyperthermophilic, autotrophic iron and nitrate reducer, strain Su06, was isolated from an active deep-sea hydrothermal vent chimney on the Endeavour Segment in the north-eastern Pacific Ocean. It was obligately anaerobic, hydrogenotrophic and reduced Fe(III) oxide to magnetite and NO3 to N2. Phylogenetic analysis based on 16S rRNA gene sequences indicated that the strain was more than 97 % similar to other species of the genera Pyrodictium and Hyperthermus . Therefore, overall genome relatedness index analyses were performed to establish whether strain Su06 represents a novel species. For each analysis, strain Su06 was most similar to Pyrodictium occultum PL-19. Relative to this strain, the average nucleotide identity score for strain Su06 was 72 %, the genome-to-genome direct comparison score was 13–19 % and the species identification score at the protein level was 89 %. For each analysis, strain Su06 was below the species delineation cutoff. Based on its whole genome sequence and its unique phenotypic characteristics, strain Su06 is suggested to represent a novel species of the genus Pyrodictium , for which the name Pyrodictium delaneyi is proposed. The type strain is Su06 (=DSM 28599=ATCC BAA-2559).

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2016-09-01
2019-11-20
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