The Type III Secretion System of Pathogenic Bacteria …

Question

The type III secretion system of pathogenic bacteria …
A) is a general secretion system found only in Gram-positive bacteria.
B) is used to inject effector proteins directly into the cytoplasm of host cells.
C) is similar to the eukaryotic secretion system.
D) is similar to the bacterial conjugation apparatus.
E) All of the above

Accepted Answer

Some Gram-negative bacteria use type III secretion systems to deliver effector proteins into the cytosol of a host cell. There is a remarkable degree of structural similarity between the type III syringe and the base of a bacterial flagellum.