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Select A letter for each part
![Below is the primary structure of a protein.
В С
D
R
H
H
R
о н
H
II
.· E
...
C -
N - C - C -N - C - C
-
II
H
H
H
R
H
H
a. For each part of the question, select the letter associated the with appropriate component of the
structure.
Peptide bond [ Select ]
Psi bond
[ Select ]
Phi bond
[ Select ]
N-terminus
[ Select ]
C-terminus [ Select]
b. Which letter represents a bond without 360-degree rotation?
[ Select ]](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2Fa6c5565a-787b-43d3-b23e-780453faf6da%2F90ac526b-120a-4c23-8abe-84ea99972c87%2Fas8y7uj_processed.png&w=3840&q=75)
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- * Draw the tripeptide FTQ, making sure to care for stereochemistry.* Identify the N-terminus and the C-terminus of the peptide.* Identify what type of stabilizing interactions the amino acid side chains could employ in the tertiary andquaternary structure of a protein.The amino acid sequence of three peptide fragments are shown below. Peptide 1: QAMGRAGDLKYLGLHSV Peptide 2: ALMALFMVMALVLVSVLFIA Peptide 3: MVEDLLKQIARYLISE (a) Circle all of the charged residues in peptide 1 (assume pH =7.0). Box all of the aromatic residues in peptide 2. Underline all of the nonpolar residues in peptide 3. (b) Determine the net charge of the predominant form of each of the peptides at pH 4.5 and pH 11.5. Assume the ionizable groups have the pKa values listen in Table 2.1 of your text. (c) Which of these peptides would be most likely to be found as an alpha helix in a soluble (cytoplasmic) protein? Which would be most likely to be found as an alpha helix in a transmembrane protein? Which would be least likely to form an alpha helix of any kind?a peptide has the sequence: Asp-His-Tyr-Cys. What is the net charge on this molecule at pH 7.0? Will it have the same net charge at pH 12?
- a) Where is the N-terminus of this peptide? Left Middle Right b) What type of secondary structure is the majority of this structure? loops alpha helix Beta sheet unstructured c) The X's indicate the alpha carbons of residues 10, 13, and 17 (labeled in the sequence above). Where would you expect this part of the structure to be found in the tertiary structure of the protein? Briefly explain your reasoning. d) The dashed line in black is indicating an interaction that is present within this structure. Draw this interaction, including all the atoms necessary for this interaction to occur. Label any partial charges present in your drawing. please upload the drawing.Our growing understanding of how proteins fold allows researchers to make predictions about protein structure based on primary amino acid sequence data Consider the following amino acid sequence Ile-Ala-His-Thr-Tyr-Gly-Pro-Phe-Glu-Ala-Ala-Met-Cys-Lys-Trp-Glu-Ala-Gln-Pro-Asp-Gly-Met-Glu-Cys-Ala-Phe-His-Arg Where might reverse turns occur? Where might Intrachain disulfide linkages be formed? What will be the secondary structure formed from this sequence? Assuming that this sequence is part of a larger globular protein, indicate the probable location of the following amino acid residues: Asp, Ile, Thr, Ala. Gln, Lys.( Hint: see Hydropathy index)A peptide containing 18 amino acid residues in its sequence was partially hydrolyzed and peptides A–D were detected in the resulting mixture. Draw the sequence of the original peptide.A Phe-Gly-AlaB Ser-Ser-Ser-Trp-Phe-Gly-AlaC Phe-Phe-Met-Ala-Ala-Pro-Trp-CysD Met-Ala-Ala-Pro-Trp-Cys-Leu-Ile-Leu-Ser-Ser
- Draw the chemical structure of an alanine pentapeptide. Indicate the location of each peptide bond. Label the phi () and psi () dihedral angles. Name and briefly define the four levels of protein structure.a peptide has the sequence: Asp-His-Tyr-Asn. What is the net charge on this molecule at pH 7.2?There is parts A-D for the picture provided. A) A peptide has the sequence, Arg-Cys-His-Tyr-Glu-Asn-Lys-Asp. What is the net charge at pH 1? Choices: -5 -4 -3 -2 -1 0 +1 +2 +3 +4 +5 B) A peptide has the sequence Arg-Cys-His-Tyr-Glu-Asn-Lys-Asp. What is the net charge at pH 5? Choices: -5 -4 -3 -2 -1 0 +1 +2 +3 +4 +5 C) Same Peptide sequence, What is the net charge at pH8.5, (N-terminus is pronated) Choices: -5 -4 -3 -2 -1 0 +1 +2 +3 +4 +5 D) A peptide has the sequence, Arg-Cys-His-Tyr-Glu-Asn-Lys-Asp. What is the net charge at pH 13? Choices: -5 -4 -3 -2 -1 0 +1 +2 +3 +4 +5 Thank You!
- Draw the structure of the following peptide as it would be at pH = 7. Does the molecule have a net charge at that pH? ExplainMet-Ser-Glu-Ala-Lys-Lys-GluDraw the bond-line structure of the given peptides. 1. Ser-Asp 2. Glu-Gln 3. Arg-His 4. Ala-Val-Ser 5. Glu-Gln-Gly 6. Cys-Gly-AsnWhich intermolecular forces are important in acetic acid, CH3 –(C=0)-oh? A particular amino acid contains a- CHNH3+ group. Is this amino acid more likely to be found on the inside or the outside of the folded protein? Briefly explain. The addition of ethanol, CH3CHOH, t an aqueous solution lowers the surface tension of the solution. Predict whether adding ethanol to an aqueous protein solution will tend to stabilize or unfold the protein. Briefly explain.