Complete genome sequence of Alteromonas sp. OM2203, a marine bacterium degrading Ulva prolifera polysaccharides

Green algae Ulva prolifera cause successive green tides in the Yellow Sea, China, leading to harmful ecological impacts and economic losses. Bacterial degradation of U. prolifera polysaccharides could accelerate the breakdown of its biomass and transition to the waning phase of green tides. In this study, the strain Alteromonas sp. OM2203 was isolated from seawater samples in the coastal area of Qingdao during a U. prolifera bloom. The genome of strain OM2203 contains one circular chromosome totaling 4,556,409 bp, with a mean GC content of 44.05%. Genomic analysis revealed that Alteromonas sp. OM2203 contains 6 ulvan lyase genes, indicating its potential to degrade U. prolifera polysaccharides and expedite the decomposition of algal biomass. Collectively, the genome of Alteromonas sp. OM2203 provides insights into the role of Alteromonas bacteria in U. prolifera polysaccharide degradation.