During vesicular transport, what structure often encapsulates the proteins?

During vesicular transport, proteins are encapsulated within membrane-bound vesicles. This process is crucial for the transport of proteins from one cellular compartment to another, ensuring that they reach their correct destination without being degraded or misfolded. The membrane of these vesicles is composed of a lipid bilayer, which is essential for maintaining the integrity of the proteins during transport. These vesicles can arise from various cellular membranes, including the endoplasmic reticulum and Golgi apparatus, and they play a key role in processes such as exocytosis and endocytosis.

Chaperone proteins, while important for assisting in the correct folding of proteins, do not encapsulate them for transport. The nuclear envelope is a double membrane structure that encloses the nucleus and is not involved in encapsulating cytoplasmic proteins for transport in vesicles. Cytoskeletal filaments provide structural support and aid in the transport of vesicles within the cell, but they do not form the vesicles themselves. Thus, the presence of membrane-bound vesicles is fundamental to the vesicular transport mechanism that encapsulates proteins effectively.