Predict where hydrophobic amino acids are found in the calcium pump. Group of answer choices in the regions of the protein in contact with the membrane’s fatty acid tails at the site where the pump becomes phosphorylated by ATP in the pump’s portions in contact with water in the cytosol and within the sarcoplasmic reticulum (SR) in the inner channel of the pump in the binding site for calcium (Ca2+)
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Which amino acids in this polypeptide would likely contain hydrophobic R-groups/side chains? N-terminus C-terminus The amino acids adjacent to the phospholipid tails The amino acids in the aqueous cytosol The amino acids in the aqueous extracellular matrix The amino acids at the N and C terminus
Dominador T.
The voltage-gated calcium channel is a protein that is imbedded and spans the lipid membrane to allow the movement of calcium into the axon terminal. What is the appropriate amino acid configuration of this channel that allows this movement to happen? Select one: a. non-polar amino acids on the interior surface and polar on the exterior surface b. polar amino acids on the interior surface and polar on the exterior surface c. non-polar amino acids on the exterior surface and polar on the interior surface d. non-polar amino acids on the interior surface and non-polar on the exterior surface
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42. (6 points) The catalytic subunit of the muscle calcium ATPase pump has ten transmembrane alpha helices. The C-terminus is on the cytoplasmic face of the plasma membrane. Make a line drawing of the protein in the membrane (like in the PowerPoint lecture notes). Clearly label the N and C termini and all internal-signal-anchor II (2), internal-signal-anchor III (3), and stop-transfer-anchor (S) sequences, then answer the questions below: cytoplasmic face ER membrane exoplasmic face Are positively charged (basic) amino acids clustered on the N-side or the C-side of the first transmembrane alpha helix? How many internal-signal-anchor II sequences are present? How many internal-signal-anchor III sequences are present? How many stop-transfer-anchor sequences are present?
Sri K.
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