Desulfitobacterium hafniense is a species of gram positive bacteria, its type strain is DCB-2T.[1] ( NCBI taxonomy ID 272564; DSM 10664).
D. hafniense are anaerobic spore-forming bacteria. The majority of the described isolates are facultatively organohalide respiring bacteria capable of reductive dechlorination of organohalides such as chlorophenols, and tetrachloroethene. The cells of D. hafniense are rod-shaped and 3.3 to 6 μm long by 0.6 to 0.7 μm wide, they are motile, each cell having one or two terminal flagella. All tested strains are resistant to the antibiotic vancomycin.[2][3]
Over the years several additional strains belonging to the hafniense species has been described from a diverse range of environments. Strains PCP-1, TCE1, DP7, TCP-A and G2 were originally published as members of a separate species Frappieri, but all are today considered as belonging to the hafniense species.[4][5]
The genome of D. hafniense contains the machinery for both pyrrolysine and selenocysteine, making it the only known organism that potentially utilizes 22 amino acids in protein translation. [14]Desulfitobacterium hafniense strain DCB-2T has a single circular genome that contains 5.78 Mbp encoding 5,045 genes. The genome of Desulfitobacterium hafniense strain DCB-2T harbors seven genes encoding reductive dehalogenases, five of these seems to be functional and two are disrupted by mutations.[15]
Full genome sequence information is available for nine desulfitobacterium hafniense strains. They all have genome sizes ranging from 5 to 5,7 Mbp, none of the sequenced strains contains any plasmids. The genomes encodes only limited numbers of reductive dehalogenases, in addition to genes for utilizing a wide range of electron donors and acceptors.
^Breitenstein A, Saano A, Salkinoja-Salonen M, Andreesen JR, Lechner U (February 2001). "Analysis of a 2,4,6-trichlorophenol-dehalogenating enrichment culture and isolation of the dehalogenating member Desulfitobacterium frappieri strain TCP-A". Archives of Microbiology. 175 (2): 133–42. doi:10.1007/s002030000248. PMID11285741. S2CID25261490.
^Miller E, Wohlfarth G, Diekert G (December 1997). "Comparative studies on tetrachloroethene reductive dechlorination mediated by Desulfitobacterium sp. strain PCE-S". Archives of Microbiology. 168 (6): 513–9. doi:10.1007/s002030050529. PMID9385143. S2CID11883954.
^Shelobolina ES, VanPraagh CG, Lovley DR (March 2003). "Use of Ferric and Ferrous Iron Containing Minerals for Respiration by Desulfitobacterium frappieri". Geomicrobiology Journal. 20 (2): 143–156. doi:10.1080/01490450303884. S2CID93574898.
^van de Pas BA, Harmsen HJ, Raangs GC, de Vos WM, Schraa G, Stams AJ (June 2001). "A Desulfitobacterium strain isolated from human feces that does not dechlorinate chloroethenes or chlorophenols". Archives of Microbiology. 175 (6): 389–94. doi:10.1007/s002030100276. PMID11491079. S2CID35998991.
^ Herring, S.; Ambrogelly, A.; Polycarpo, C. R.; Soll, D. Recognition of Pyrrolysine TRNA by the Desulfitobacterium Hafniense Pyrrolysyl-TRNA Synthetase. Nucleic Acids Research 2007, 35 (4), 1270–1278. https://doi.org/10.1093/nar/gkl1151.