CH HC CH, | - Polypeptide backbone CH2 HC CH, CH - CH2¬S–5}-CH,-- OH -CH;-CH;-CHy-CH, NH," 0-ċ-CH,- d. evel of protein structure are these interactions producing?
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- Figure 3.23 Which categories of amino acid would you expect to find on the surface of a soluble protein, and which would you expect to find in the interior? What distribution of amino acids would you expect to find in a protein embedded in a lipid bilayer?The first and major effect in denaturation of proteins is that: a. peptide bonds break. b. helices unwind. c. sheet structures unfold. d. tertiary structure is changed. e. quaternary structures disassemble.Give the force of interaction involved in the protein folding of the protein structure A and C: COO CH,C-N-H• • •0- Pleated sheet structure A H C Helical structure CH3 CH3 - CH3 -CHCH,CH, CH- CH, CH3 (CH,),NH, -0-CCH,- C=0..•HN CH, CH, CH,CH CH,CH CH, CH, CH OH 0=C -CH,-S,S-CH,- H,Ñ Structure A: H-bonding: Structure C: Van der Waals O Structure A: Covalent interaction; Structure C: dipole-dipole interaction O Structure A: Salt bridge: Structure C: H-bonding Structure A: Hydrophobic interaction; Structure C: ionic interaction 00000 B
- 2. a. In the following diagram of a portion of a protein, label the types of interactions that are shown. b. What level of protein structure are these interactions producing? b. CH CH3 CH3 Polypeptide backbone CH2 H3C H3Ç 10 CH С—ОН - CH,-S-S-CH,- а. CH2 с. -CH,-CH,-CH2-CH2-NH 0-C-CH2- d.18 The image below shows the different interactions responsible for the spontaneous folding of a protein molecule. Identify which interactions are involved for each labelled region 0-H H CH,OH CH, NH, 0 B O-H--OO CH, CH₂ A B D C A यह मह CH CH₂COOH C H CH, CH, CH, CH H--O=C D T (CHJANH, - interactions ion-dipole interaction Hydrogen bonding Hydrophobic interactions Disulfide bonds lon-ion interaction 188) The figure shows an unfolded polypeptide consisting of six amino acids. Describe how cooperativity will drive protein folding of the polypeptide chain into an alpha-helixe- 10EEHOW is AG changed as each amino acid is incorporated into the secondary structure - s)? O H O H 3 H. H. 5 CH-C H. 6 -N-CH-C- OH O H,N CH-C -N CH C-N CH CH CH2 CH2 CH2 CH2 CH OH CH H;C CH3
- 4. Each diagram in Figure 2 below shows one level of organization of a protein. Identify each level and describe it. CA ITA (a) (b) 0 hydrogen co CH₂ bond H-0 (c) -0, 0 lonic bond C-OH H₂C H₂C CH-CH₂ amino acids -hydrophobic interactions disulfide bridge Figure 2 5. Hemoglobin is made up of four polypeptides, but also require a beme group3. Amino Acid Sequence and Protein Structure 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. 1 3 5 6 7 8 9 10 Ile - Ala - His - Thr - Tyr - Gly - Pro - Phe-Glu – Ala- - 11 12 13 14 15 17 20 Ala - Mat - Cys- Lys - Trp - Glu-Ala-Gln-Pro - Asp- 16 18 19 21 22 23 24 25 26 27 28 Gly - Met-Glu - Cys - Ala - Phe - His - Arg (a) Where might bends or ß turns occur? (b) Where might intrachain disulfide cross-linkages be formed? (c) Assuming that this sequence is part of a larger globular protein, indicate the probable location (external surface or interior of the protein) of the following amino acid residues: Asp, lle, Thr, Ala, Gln, Lys. Explain your reasoning.7. Label the three main parts of a nucleic acid in Figure 3. (b) (a) 0 0 O-P-0-P-O-P-O-CH2 0 03 Figure 3 0 (c) CHH CH H ㅐ|C|우 HGE 8 H 3. C-C2 НО OH (H) NHz
- In the following diagram of a portion of a protein, label the types of interactions that are shown. What level of protein structure are these interactions producing?Part A What is the highest structural level of protein structure represented in the following image? primary quaternary secondary pentanary tertiary O OBelow is the primary structure of a protein. A R 1 I I H H || O H 1 Psi bond [Select] Phi bond [Select] N-terminus [Select] B C D H O I || C-terminus [Select] NC-C-N-C-C-N-C-C-N-C-C-N-C-C - N... I 1 H H I R R H I 11 O HO I || R R I I H a. For each part of the question, select the letter associated the with appropriate component of the structure. Peptide bond [Select] I H U MO b. Which letter represents a bond without 360-degree rotation? [Select] H |
