psychrobacter proteolyticus psychrobacter proteolyticus psychrobacter proteolyticus is a species of bacteria first isolated from the antarctic krill euphausia superba. it excretes a cold-adapted metalloprotease. it is a strictly aerobic, strongly oxidase-positive, psychrotrophic, halotolerant, gram-negative nonmotile coccobacillus; its type strain is cip106830t (=dsm13887). psychrobacter proteolyticus scientific classification domain: bacteria phylum: pseudomonadota class: gammaproteobacteria order: pseudomonadales family: moraxellaceae genus: psychrobacter species: p. proteolyticus binomial name psychrobacter proteolyticusdenner et al. 2001 type strain cip 106830, denner 116, dsm 13887, lmg 21313