Streptopain, also known as streptococcal pyrogenic exotoxin B (SpeB) is a streptococcal cysteine protease.
[1][2][3][4] Other names include Streptococcus peptidase A, Streptococcus protease, and streptococcal cysteine proteinase.
Streptopain catalyses the following chemical reaction It is isolated from the group A bacterium Streptococcus pyogenes and acts as a virulence factor.