psychrobacter arcticus psychrobacter arcticus psychrobacter arcticus is a gram-negative, nonmotile species of bacteria first isolated from siberian permafrost. its type strain is 273-4t (=dsm 17307t =vkm b-2377t). psychrobacter arcticus scientific classification domain: bacteria phylum: pseudomonadota class: gammaproteobacteria order: pseudomonadales family: moraxellaceae genus: psychrobacter species: p. arcticus binomial name psychrobacter arcticusbakermans et al. 2007 hypoacylated lipopolysaccharide (lps) from p. arcticus induces weak tlr4-mediated inflammatory response in macrophages and such lps bioactivity may potentially result in the failure of local and systemic bacterial clearance in patients.