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1. How do proteins get from the ER to a Golgi network compartment? What compartment/area of the Golgi do they enter?

2. What type of protein processing occurs in the Golgi?

3. Does transport via vesicle only occur in one direction (ie. ER to Golgi to organelle or plasma membrane) or do some vesicles move from trans Golgi back to cis Golgi or from Golgi back to the ER?

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Tod Thiel
Tod ThielLv2
28 Sep 2019
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Related questions

29 Most proteins destined to enter the endoplasmic reticulum _________.

(a) are transported across the membrane after their synthesis is complete.

(b) are synthesized on free ribosomes in the cytosol.

(c) begin to cross the membrane while still being synthesized.

(d) are keep binding to Signal recognition particle (SRP) while they are translated.

30 Which of the following choices reflects the appropriate order of locations through which a protein destined for the plasma membrane travels?

(a) lysosome → endosome → plasma membrane

(b) ER → lysosome → plasma membrane

(c) Golgi → lysosome → plasma membrane

(d) ER → Golgi → plasma membrane

31 Which of the following statements about vesicle budding from the Golgi is false?

(a) COPII can initiate vesicle budding on Golgi membrane.

(b) Some vesicles budded from Golgi membranes move towards ER.

(c) Once vesicle budding completed, clathrin molecules are released from the vesicle.

(d) Clathrin molecules act at the cytosolic surface of the Golgi membrane.

32 Which of the following statements is false?

(a) The signal sequences on mitochondrial proteins are first bound to translocator on outer membrane after translation.

(b) Most mitochondrial proteins are not imported from the cytosol but are synthesized inside the mitochondria.

(c) Chaperone proteins in the mitochondria facilitate the movement of proteins across the outer and inner mitochondrial membranes.

(d) Mitochondrial proteins cross the membrane in their unfolded state.

1. How do viral proteins get localized to the nucleus?

2. How do viral proteins get localized to the plasma membrane?

3. How does a nascent protein get targeted to the ER?

4. What amino acid residue on a target protein is attached to the sugar?

5.Where in the cell are N-linked oligosaccharides FIRST added to a glycoprotein?

6.Where in the cell does the initial sugar get processed into its mature form?

7. That is, which exact compartment(s) of the secretory pathway is mannose removed? Galactose added? Sialic acid added? How does the position of glycosylation (N-linked vs internal) affect which chaperone is used to properly fold proteins in the ER?

8. What compartments comprise the secretory pathway in mammalian cells?

9.How do proteins get transported from the ER to the Golgi?

10.How do the transport vesicles return from the Golgi to the ER?

11.What happens to their components when they get there? How does poliovirus inhibit the secretory pathway?

SHORT answers please

Materials traffic through the endomembrane system of eukaryotic cells via vesicles. There are two coat proteins COP I and COP II that assemble vesicles for transport along microtubules. COP I coated vesicles undergo retrograde transport, for example, to move materials from the Golgi back to the ER. COP II coated vesicles undergo anterograde transport to move materials from the ER outward.

(1 pt) Which motor protein (myosin, kinesin or dynein) interacts with COP I vesicles? ______________

(1 pt) Which motor protein interacts with COP II vesicles? ______________

(1 pt) Some proteins that traffic in this system contain a KDEL amino acid signal sequence for retention in the ER that interacts with a KDEL receptor protein. Would you expect the KDEL receptor protein to be found associated with COP I or COP II coated vesicles? _________

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