Pseudogemmobacter bohemicus gen. nov., sp. nov., a novel taxon from the Rhodobacteraceae family isolated from heavy-metal-contaminated sludge
2019
The creamy white to beige, aerobic, non-motile, ovoid to rod-shaped, Gram-stain-negative strain, Cd-10T, was isolated from heavy-metal-contaminated sludge from a decantation basin of a heavy metal processing factory based on its ability to tolerate CdCl2 in the cultivation medium. In the reconstruction of its phylogeny based on 16S rRNA gene sequences, strain Cd-10T clustered with species of the genera
Gemmobacter
, Xinfangfangia,
Tabrizicola
and
Rhodobacter
within the family
Rhodobacteraceae
. Its 16S rRNA gene sequence exhibited 96.32 % pairwise similarity to the type strain of
Xinfangfangia soli
, 95.3 % to that of
Gemmobacter intermedius
, followed by
Tabrizicola fusiformis
(95.10 %),
Rhodobacter sediminis
(94.88 %),
Gemmobacter nectariphilus
and
Rhodobacter capsulatus
(both 94.81 %). The major respiratory quinone was Q-10 accompanied by Q-9, the fatty acid profile consisted predominantly of C18 : 1ω7c, C18 : 0, C16 : 0 and C16 : 1ω7c, the major polar lipids were phosphatidylglycerol, phosphatidylmethylethanolamine, phosphatidylcholine and diphosphatidylglycerol. An analysis of the percentage of conserved proteins deduced from draft or complete genomic sequences of strain Cd-10T and representatives of its closest relatives suggested that strain Cd-10T is a member of a novel genus within the
Rhodobacteraceae
family for which we propose the name Pseudogemmobacter. Strain Cd-10T (=DSM 103618T=NCCB 100645T) is the type strain of Pseudogemmobacter bohemicus gen. nov., sp. nov., the type species of the genus Pseudogemmobacter gen. nov.
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