Along with other secretory systems, secretion via the type II secretion system, is a single-step process.
The type 2 secretion system (often referred to as the type II secretion system or the T2SS) is protein secretion machinery found in various species of Gram-negative bacteria, including various human pathogens such as Pseudomonas aeruginosa and Vibrio cholerae. Along with other secretory systems such as the chaperone/usher pathway and the type IV secretion system, secretion via the type II secretion system is a two-step process. 
