Pseudomonas proteamaculans Paine and Stansfield 1919 Xantomonas proteamaculans (Paine and Stansfield 1919) Burkholder 1948 Erwinia proteamaculans (Paine and Stansfield 1919) Dye 1966 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.

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