serratia proteamaculans serratia proteamaculans serratia proteamaculans is a gram-negative, facultatively anaerobic, rod-shaped bacterium. s. proteamaculans hy-3 isolated from the digestive tract of a spider produces an extracellular protease named arazyme, with an estimated molecular mass of 51.5 kda. serratia proteamaculans scientific classification domain: bacteria phylum: pseudomonadota class: gammaproteobacteria order: enterobacterales family: yersiniaceae genus: serratia species: s. proteamaculans binomial name serratia proteamaculans(paine and stansfield 1919) grimont et al. 1978 synonyms pseudomonas proteamaculans paine and stansfield 1919 xantomonas proteamaculans (paine and stansfield 1919) burkholder 1948 erwinia proteamaculans (paine and stansfield 1919) dye 1966