Complete genome sequence of Vreelandella sp. SM1641, a marine exopolysaccharide-producing bacterium isolated from deep-sea hydrothermal sediment of the Southwest Indian Ocean.

Vreelandella sp. SM1641 was isolated from the hydrothermal vent sediment of the southwest Indian Ocean at a water depth of 2519 m. The complete genome sequence of strain SM1641 was analyzed to understand its metabolic capacities and biosynthesis potential of natural products in this study. The genome of strain SM1641 consists of a circular chromosome and two plasmids. The length of the circular chromosome was 4,731,121 bp with GC content of 54.46 mol%, and the length of plasmid A was 302,095 bp with GC content of 54.95 mol%, and the length of plasmid B was 8857 bp with GC content of 46.31 mol%. Genomic data showed that strain SM1641 had several gene clusters involved in the synthesis of exopolysaccharides (EPSs) and polyhydroxyalkanoates (PHAs) synthesis. SM1641 also has a variety of genes that respond to osmotic stress, heat shock, cold shock, oxidative stress, and heavy metal stress, which plays a critical role in bacterial adaptation to hydrothermal environments. Therefore, genome sequencing and data mining of strain SM1641 are helpful to further understand the molecular mechanism of Vreelandella adapting to the deep-sea hydrothermal environment, and provide a basis for further experimental exploration.