> See also: > - [[Cellular Communication]] # Macromolecule Transportation **Sec (Secretory) System** - SecYEG: Transmembrane transporter (allow for transportation or embedding) - SecA: Recognizes the signal, ATP hydrolyzing enzyme - SecB: Prevents folding of the protein - SecDF: Use the proton motive force for translocation **Twin Arginine Translocation (tat) System** - Derives its energy from the proton motive force - Found in both gram negatives and gram positives (only the plasma membrane → not secretion for gram-) ## Secretion and Translocation Secretion involves the movement of components from the cytoplasm through the membrane and outside of the cell Translocation involves the movement of components from one location within a cell to another, without crossing the outer membrane.