Whole-Genome Sequence of the Novel Antarctobacter heliothermus Strain SMS3, Found in Association with the Marine Diatom Skeletonema marinoi

As part of an ongoing investigation into the microbiome of the marine diatom Skeletonema marinoi, the bacterial strain SMS3 was isolated from a culture of S. marinoi strain ST54, which had been propagated from a sample of top layer marine sediments taken from the Swedish west coast. We present here the sequenced genome of this bacterium, which we place in the taxon Antarctobacter heliothermus, based on a phylotaxonomic analysis and its high 16S rRNA sequence similarity to the A. heliothermus type strain DSM 11445(T). Its 5,331,190 bp genome consists of a circular chromosome and three circular plasmids, and contains 5,019 CDSs. Strain SMS3 contains a phosphatidylcholine synthase gene, as well as genes involved in DMSP degradation, both of which imply a potential symbiotic relationship with its host.