Tags: Protein.
M protein is a virulence factor that can be produced by certain species of Streptococcus.Viruses parasites and bacteria are covered in protein and sugar molecules that help them gain entry into a host by counteracting the host’s defences. One such molecule is the M protein produced by certain streptococcal bacteria. M proteins embody a motif that is now known to be shared by many Gram-positive bacterial surface proteins.