Chapter 13: Intercellular Membrane Traffic

The secretory pathway delivers newly synthesized proteins, carbohydrates, and lipids either to the plasma membrane or extracellular space.

The cells remove plasma membrane components and deliver them to internal compartments called endosomes, from where they can be recycled to the same or different regions of the plasma membrane or be delivered to lysosomes for degradation.

Mediates transport from the Golgi apparatus and from the plasma membrane.

Mediate transport from the ER and from the Golgi cisternae.

Mediate transport from the ER and from the Golgi cisternae.

It helps regulate vesicle formation and other steps in the control of vesicle traffic.

Bind to and impose their shape on the underlying membrane via electrostatic interactions with the lipid head groups.

It modifies the many proteins and lipids that it receives from the ER and then distributes them to the plasma membrane, lysosomes, and secretory vesicles.

Lysosomes are membrane-enclosed organelles.

Both receptor and ligand are transferred to a different plasma membrane domain, causing the ligand to be released at a different surface from where it originated, a process called transcytosis.