Golgi apparatus definition

Table of Contents • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • Golgi Apparatus Definition The Golgi apparatus is a membrane-bound packed inside a transport vesicle. The vesicle containing the properly-folded protein is pinched off from the endoplasmic reticulum and then shuttled to the Golgi apparatus where the protein will undergo maturation (by post-translational modifications). The vesicle is transported from the endoplasmic reticulum along the cytoskeleton to the cis face of the Golgi. The contents of the vesicle are emptied into the lumen of the Golgi. Inside the lumen, the protein is modified, labeled with a signal sequence, and packed in a vesicle for transport to the next destination. Golgi Apparatus Overview • A membrane-bound organelle Is Golgi apparatus an organelle? Yes! As pointed out earlier, the Golgi apparatus is a membrane-bound organelle. Similar to the • Part of the GERL system The Golgi apparatus is one of the three components of the GERL system, together with the Endoplasmic Reticulum and the Lysosomes. The Golgi, in fact, is derived from the transport vesicles that bud off from the endoplasmic reticulum and have fused with the Golgi apparatus. The Golgi apparatus though can be identified from the endoplasmic reticulum by being composed of stacks of flattened sacs. Rather than a mesh network like the sacs of the endoplasmic reticulum are, the Golgi sacs are arranged in a stack. Imagine a pile of pancakes! But unlike pancakes that exist...