desulfitobacterium hafniense desulfitobacterium hafniense desulfitobacterium hafniense is a species of gram positive bacteria, its type strain is dcb-2t. ( ncbi taxonomy id 272564; dsm 10664). desulfitobacterium hafniense scientific classification domain: bacteria phylum: bacillota class: clostridia order: clostridiales family: peptococcaceae genus: desulfitobacterium species: d. hafniense binomial name desulfitobacterium hafniensechristiansen and ahring 1996 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. 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. d. hafniense isolates strain source dsm dcb-2t sewage sludge 10664 pcp-1 sewage sludge 12420 tcp-a river sediment 13557 gbfh river sediment --- y51 polluted soil --- tce1 polluted soil --- pce-s polluted soil 14645 g2 subsurface 16228 dp7 human feces 13498 lbe not described --- genomes 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. 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. 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. strain genome size (mbp) number of reductive dehalogenases genome described y51 5,7 1 2006 dcb-2t 5,3 7 2012 pce-s 5,7 2 2015 dh 5,4 0 2016 tce1 5,7 1 2017 pcp-1 5,6 7 2017 lbe 5,5 2 2017 dp7 5,2 0 2017 tcp-a 5 5 2017