Integral membrane proteins can exist as all of the following, except: a. A single helix Ob. A beta barrel O c. A single beta strand Od. A group of seven helices
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- While investigating structure-function studies in a membrane transport protein, a researcher discovered a single nucleotide mutation that led to the loss of a key alpha-helical segment of the protein in the hydrophilic domain. The mutation that led to this finding is most likely which of the following? Hint: helix breaker O AUC to GUC GAG to CCU GUU to GCU GUG to UUG O CUC to CCC+H₂N-CH-COO™ 1 CH₂ I CH₂ 1 CH₂ I +H₂N-CH₂ A. amino acid D O amino acid B amino acid C O amino acid A +H₂N-CH-COO™ 1 amino acid E C=O B. Of the four amino acids shown, this amino acid would most likely be located in the transmembrane domain of an integral membrane protein. +H₂N-CH-COO™ 1 CH₂ 1 OH C. +H₂N-CH-COO™ I CH H₂C CH₂ D.The integral membrane protein XYZR has a single alpha helix spanning the membrane. Where was this protein made and what can you say about amino acids that occur/do not occur in the alpha helix versus the domains sticking out on both sides of the membrane?
- A scientist is about to develop a program to predict the presence of an alpha-helix trans-membrane domain. What are the characteristics that you advise him to use in order to succeed his mission? Explain your answerIn the diagram below, which of the following labels (in red) would represent single- stranded binding proteins (SSBS)? A B A E.The CFTR membrane protein has an alpha helix that spans the membrane. The amino acid sequence of the central portion of this alpha helix, which is embedded within the membrane, is which one of the sequences below? Sequences are provided in the single letter code. а. VVVLVVVVLVVLLLVL b. EEEREEEEREERRRER C. VVVLVVVVREERRRER d. VVVEVVVVEVVEEEVE
- Explain how can one predict the number of transmembrane domains (TM helices) in an integral membrane protein. Note: For the above question, I only seek for an original answer no more than six sentences.If you did a classic Pulse-Chase experiment to follow the path of a secreted protein, and you forgot to do the Chase, which of the following would you observe? No radioactivity would be seen in any of the structures. Radioactivity would increase first in rough ER, then Golgi Complex, then secretory vesicles, but it would remain high in all, never decreasing. Nothing would change Radioactivity would increase in all 3 structures simultaneously and stay high.Shown below is a peripheral glycoprotein which functions as receptor for hormones in animal cells. X and Y are specific amino acids in the protein while the rectangles shown is the saccharide that is N-linked to the protein at X. What is the most likely composition of X and Y of this membrane protein? A. X = asp, Y = gly B. X = gIN, Y = leu %3D C. X = ser, Y = ile %3D D. X = cys, Y = met E. X = asN, Y = his
- Sequence analysis of a membrane protein shows four 20-amino acid long stretches of residues that are predominantly hydrophobic. Between each of these stretches of hydrodophobic residues, a stretch of predominantly hydrophilic residues is found. From this observation one can reasonably postulate that: A. this is a peripheral membrane protein which interacts with the membrane via hydrophobic interactions B. this protein has 4 alpha helical segments that span the membrane C. this protein can be removed from the membrane by dramatically increasing the salt concentration. D. this is a 4 stranded beta barrel which spans the membrane E. this is a glycoprotein Facilitated diffusion (passive transport) through a biological membrane is A. driven by a concentration gradient. B. generally irreversible. C. endergonic. D. driven by the ATP to ADP conversionFor transmembrane proteins, either single-pass or multi-pass, the membrane spanning part of the protein usually assumes which of the following motifs? βαβ αβα α-helix β-pleated sheetSequence analysis of a membrane protein shows four 20-amino acid long stretches of residues that are predominantly hydrophobic. Between each of these stretches of hydrodophobic residues, a stretch of predominantly hydrophilic residues is found. From this observation one can reasonably postulate that: A. this is a peripheral membrane protein which interacts with the membrane via hydrophobic interactions B. this protein has 4 alpha helical segments that span the membrane C. this protein can be removed from the membrane by dramatically increasing the salt concentration. D. this is a 4 stranded beta barrel which spans the membrane E. this is a glycoprotein