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How does a cell ‘know’ that a protein should move to the endoplasmic reticulum
Step by step
Solved in 2 steps
- Ribosomes in the cytoplasm (cytosol) capture mRNA that can be translated into an enzyme (in this case a protease) to the lysosome. a) Describe what happens from the time the enzyme (protease) begins to form in the cytoplasm until it end up in the lysosome and explain how the enzyme is transported to the lysosome, Explain in terms of the clathrin and thethering proteinsWhat type of signal sequence(s) would be used to create the ACE2 (type 1) integral membrane protein?The following are steps that occur when a protein is targeted for synthesis on the endoplasmic reticulum (ER). Which of the following indicates the correct sequence for the signal mechanism that targets proteins for the ER? The SRP leaves and polypeptide synthesis resumes, with simultaneous translocation across the membrane. Polypeptide synthesis begins on a free ribosome in the cytosol. An SRP binds to the signal peptide, halting synthesis momentarily. The rest of the completed polypeptide leaves the ribosome and folds into its final conformation. The SRP binds to a receptor protein in the ER membrane that is part of a protein complex that forms a pore. The signal peptide is cleaved by an enzyme in the receptor protein complex. A. 2, 3, 5, 1, 6, 4 B. 2 ,3, 5, 6, 1, 4 C. 3, 1, 6, 5, 2, 4 D. 3, 2, 1, 5, 6, 4
- How long is a typical transmembrane domain, and what is the chemical composition of the amino acids found within the transmembrane domain of a single-spanning integral membrane protein? A~ 20 amino acids; hydrophobic amino acidsB~ 100 amino acids, amphipathic amino acidsC~ 10 amino acids; polar, charged amino acids D~ 50 amino acids, polar, uncharged amino acidsWhat is the energy source that powers the cotranslational movement of proteins across the endoplasmic reticulum?What would happen in each of the following cases where something related to intracellular transport is altered? Assume in each case that the protein involved is a soluble protein, not a membrane protein. State where each protein would be located and explain each of your answers. You add a signal sequence (for the Golgi) to the N-terminal end of a normally cytosolic protein. You change the hydrophobic amino acids in an ER signal sequence into other, hydrophobic, amino acids.
- A peripheral protein, which is not integral to the cell membrane, is also called: a multi-pass transmembrane protein (like band 3.0 protein) a single-pass transmembrane protein (like glycophorin A) a monolayer-associated protein (like the COX-1 protein) a protein-attached protein (like cytochrome c) a lipid-linked protein (like the Ras protein)What is the role of the lysosome in degrading extracellular and intracellular proteins?Consider the amino acids on the image below. Which of the following amino acids would be most likely to be found in the part of an integral membrane protein that is located within the membrane? (Select all answers that apply.) Asparagine (Asn) Lysine (Lys) Phenylalanine (Phe) Valine (Val) Glutamic acid (Glu) Methionine (Met)