A strictly anaerobic, organohalide-respiring bacterium, designated strain GPT, was characterized using a polyphasic approach. GPT is Gram-stain-negative, non-spore-forming and non-motile. Cells are irregular cocci ranging between 0.6 and 0.9 µm in diameter. GPT couples growth with the reductive dechlorination of 1,2-dichloroethane, vinyl chloride and all polychlorinated ethenes, except tetrachloroethene, yielding ethene and inorganic chloride as dechlorination end products. H2 and formate serve as electron donors for organohalide respiration in the presence of acetate as carbon source. Major cellular fatty acids include C16 : 0, C18 : 1ω9c, C16 : 1, C14 : 0 and C18 : 0. On the basis of 16S rRNA gene phylogeny, GPT is most closely related to Dehalogenimonas formicexedens NSZ-14T and Dehalogenimonas alkenigignens IP3-3T with 99.8 and 97.4 % sequence identities, respectively. Genome-wide pairwise comparisons based on average nucleotide identity, average amino acid identity and digital DNA-DNA hybridization do not support the inclusion of GPT in previously described species of the genus Dehalogenimonas with validly published names. On the basis of phylogenetic, physiological and phenotypic traits, GPT represents a novel species within the genus Dehalogenimonas, for which the name Dehalogenimonas etheniformans sp. nov. is proposed. The type strain is GPT (= JCM 39172T = CGMCC 1.17861T).
Keywords: Dehalococcoidia; Dehalogenimonas; organohalide respiration; reductive dechlorination; vinyl chloride.