If a bacterial polypeptide has a characteristic amino acid sequence called a signal sequence, what will the cell do to that polypeptide? Insert it into the chromosomal DNA. Attach the polypeptide to an enzyme. Degrade the polypeptide. Move it to the outside of the cell.
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Step 1: Signal sequences are short stretches of amino acids that direct proteins to their correct location within the cell. Show more…
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What would happen to a protein like signal peptidase if you removed its signal peptide but added a nuclear localization signal (NLS)? It would end up in the nucleus. It would end up in the cytoplasm It would be secreted None of the above What would happen to a secreted protein (e.g. insulin) if you produced it from an mRNA missing the sequence encoding the signal peptide? It would be properly secreted, though it might not fold correctly. It would get translated in the cytoplasm and remain there. It would get trapped in the ER. It would get transported to the plasma membrane and become embedded there. Which of these amino acids would you predict are most likely to rely on wobble (in other words, which is coded for by the largest number of codons? Alanine (Ala) Arginine (Arg) Aspartic acid (Asp) Asparagine (Asn) Please explain!
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10. A signal peptidase is an ER resident protein, which cleaves the signal peptide sequence after a protein is translocated in ER. Do you think a signal peptidase will be synthesized with a signal peptide? If yes, which enzyme would remove the signal sequence from signal peptidase? How can you make the signal peptidase to stay in cytoplasm?
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You are studying a number of proteins that are present in the nucleus. You find that all the proteins in the nucleus have the following amino acid sequence in common somewhere on the protein: PPKKKRKV. You hypothesize that this sequence is a signal sequence that is used to direct proteins to the nucleus. If you were to add this sequence to a cytoplasmic protein, what would you predict would happen to the protein (if your hypothesis were correct)?" a. The protein would be degraded. b. The protein would become a carbohydrate. c. The protein would be located in the nucleus instead of the cytoplasm. d. Nothing would happen--the protein would remain in the cytoplasm.
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