Ribosomes transfer their newly synthesized proteins into the lumen of the RER where they undergo structural modifications, such as folding or the acquisition of side chains.
These modified proteins will be incorporated into cellular membranes—the membrane of the ER or those of other organelles —or secreted from the cell such as protein hormones, enzymes. The RER also makes phospholipids for cellular membranes. Since the RER is engaged in modifying proteins such as enzymes, for example that will be secreted from the cell, the RER is abundant in cells that secrete proteins. This is the case with cells of the liver, for example.
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How Are Organelle Membranes Maintained? What Does the Golgi Apparatus Do? Figure 2: Membrane transport into and out of the cell. Transport of molecules within a cell and out of the cell requires a complex endomembrane system. What Do Lysosomes Do? Figure 3: Pathways of vesicular transport by the specific vesicle-coating proteins.
The endomembrane system of eukaryotic cells consists of the ER, the Golgi apparatus, and lysosomes. Membrane components, including proteins and lipids, are exchanged among these organelles and the plasma membrane via vesicular transport with the help of molecular tags that direct specific components to their proper destinations. Cell Biology for Seminars, Unit 3. Topic rooms within Cell Biology Close. No topic rooms are there.
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