Question

pls answer 6 and 7

6. Secondary structure (turn): The image below is of a polypeptide in secondary (20) structure level of protein folding. Specifically it is of a turn. Turns vary in length. The shorter the turn the more drastic the angle changes. The longer the turn, the more gradual the angles needed. a. Name the specific bond/interaction indicated by the dotted lines. b. Is this bond/interaction covalent or non-covalent? Is this bond/interaction permanent or transient? d. What parts of the amino acid (backbone or side chain) are involved in this bond/interaction? c. e. Predict if one or two hydrogen bonds are sufficient to hold the turn structure? Explain why or why not [max 1-2 sentences]. 7. Tertiary structure: The image below is of a polypeptide in tertiary (3°) structure level of protein folding. The images on the left is of a generic globular and fibrous protein. The image on the right indicates the backbone items as a ribbon (or line), while the side chains are chemically drawn a. Name the specific bond/interaction indicated by the . Letter A i. Letter B Letter C iv. Letter D Are these bonds/interactions/linkages covalent or non-covalent? Are these bonds/interactions permanent or transient? d. b. c. What parts of the amino acid (backbone or side chain) are involved in these bonds/interactions/linkages? Are these bonds/interactions/linkages between amino acids in the same polypeptide polypeptide? or different e. polpeptde backbone CH CH-CHy-CH-CH-NH o-c-CH -NH CH HC CH HyC CH Glebular Protein Farous Protein -oxo-u

Answer 1

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7 nou - covalent interaction. bond shown by dotted line is Hydrogen bond b) Hydrogen bond is a type of non-covalent in c) permanent d) backbone of amino acid is involved in this interac e) No one or 2 bychogen hond is not enough to the turn or shucture. Breaking of Hobi the protein structure. so each 4-bond is important for the pooten not enough to hold cause. Breaking of H-bonds conic bond hydrophobic interactions c • disulphide linkage Hydrogen bondilo there are nou - Covalent interactions c) d) toran permanent transient side chains are involved. e) with in the same polypeptide