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Title: Pseudodesulfovibrio mercurii sp. nov., a mercury-methylating bacterium isolated from sediment

Journal Article · · International Journal of Systematic and Evolutionary Microbiology
ORCiD logo [1]; ORCiD logo [1]; ORCiD logo [2]; ORCiD logo [3]; ORCiD logo [4]; ORCiD logo [5]; ORCiD logo [3]; ORCiD logo [6]; ORCiD logo [3]
  1. Smithsonian Environmental Research Center, Edgewater, MD (United States)
  2. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Smithsonian Environmental Research Center, Edgewater, MD (United States)
  3. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  4. Univ. of Missouri, Columbia, MO (United States)
  5. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); LanzaTech, Skokie, IL (United States)
  6. Université de Pau et des Pays de l’Adour (UPPA), Pau (France). Inst. of Analytical Sciences and Physico-Chemistry for Environment and Materials (IPREM)

The sulfate-reducing, mercury-methylating strain ND132T was isolated from the brackish anaerobic bottom sediments of Chesapeake Bay, USA. Capable of high levels of mercury (Hg) methylation, ND132T has been widely used as a model strain to study the process and to determine the genetic basis of Hg methylation. Originally called Desulfovibrio desulfuricans ND132T on the basis of an early partial 16S rRNA sequence, the strain has never been formally described. Phylogenetic and physiological traits place this strain within the genus Pseudodesulfovibrio, in the recently reclassified phylum Desulfobacterota (formerly Deltaproteobacteria ). ND132T is most closely related to Pseudodesulfovibrio hydrargyri BerOc1T and Pseudodesulfovibrio indicus J2T. Analysis of average nucleotide identity (ANI) of whole-genome sequences showed roughly 88 % ANI between P. hydrargyri BerOc1T and ND132T, and 84 % similarity between ND132T and P. indicus J2T. These cut-off scores <95 %, along with a multi-gene phylogenetic analysis of members of the family Desulfovibrionacea, and differences in physiology indicate that all three strains represent separate species. The Gram-stain-negative cells are vibrio-shaped, motile and not sporulated. ND132T is a salt-tolerant mesophile with optimal growth in the laboratory at 32 °C, 2 % salinity, and pH 7.8. The DNA G+C content of the genomic DNA is 65.2 %. It is an incomplete oxidizer of short chain fatty acids, using lactate, pyruvate and fumarate with sulfate or sulfite as the terminal electron acceptors. ND132T can respire fumarate using pyruvate as an electron donor. The major fatty acids are iso-C15 :0, anteiso-C15 : 0, iso-C17 : 0, iso-C17 : 1ω9c and anteiso-C17 : 0. We propose the classification of strain ND132T (DSM 110689, ATCC TSD-224) as the type strain Pseudodesulfovibrio mercurii sp. nov.

Research Organization:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Biological and Environmental Research (BER); University of Maryland; Harvard School of Public Health
Grant/Contract Number:
AC05-00OR22725
OSTI ID:
1767872
Journal Information:
International Journal of Systematic and Evolutionary Microbiology, Vol. 71, Issue 3; ISSN 1466-5026
Publisher:
International Union of Microbiological SocietiesCopyright Statement
Country of Publication:
United States
Language:
English

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