Sea ice in the polar oceans is a dynamic and challenging environment for life to survive, with extreme gradients of temperature, salinity and nutrients etc., as well as formation of ice crystals. Bacteria surviving in sea ice attract broad attention from academia and industry, due to fascinating mechanisms for adaptation. Here we described the complete genome sequence of Marinomonas arctica BSI20414, isolated from Arctic sea ice. The strain tolerated high salinity and low temperature. Genetic features commonly related to adaptation to oxidative stress, osmotic stress and cold stress were detected in the genome. In addition, a large adhesion protein containing a putative antifreeze protein (AFP) domain was detected in the genome, similar with the giant AFP MpIBP from M. primoryensis. The presence of the putative AFP could facilitate M. arctica BSI20414 to bind to sea ice for favorable conditions and protect it from freezing. The genome sequence and the AFP reported here can provide insights into adaptation to sea ice and can be explored further for biotechnological applications.

极地海洋中的海冰是一个动态且具有挑战性的生命生存环境，具有极端的温度、盐度和营养等梯度，以及冰晶的形成。由于迷人的适应机制，在海冰中存活的细菌引起了学术界和工业界的广泛关注。在这里，我们描述了从北极海冰中分离的Marinomonas arctica BSI20414的完整基因组序列。该菌株耐受高盐度和低温。在基因组中检测到通常与适应氧化应激、渗透应激和冷应激相关的遗传特征。此外，在基因组中检测到一个包含推定的抗冻蛋白 (AFP) 结构域的大粘附蛋白，类似于来自的巨型 AFP Mp IBP。M. primoryensis。假定的 AFP 的存在可以促进M. arctica BSI20414 在有利条件下与海冰结合并防止其冻结。这里报告的基因组序列和 AFP 可以提供对海冰适应的见解，并且可以进一步探索生物技术应用。