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Chapter 6: Q11. (page 158)
Why do turns and loops most often occur on the protein surface?
The loops and turns often occur on the protein surface because of their hydrophilic residues.
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Explain the role of ATP in the action of Hsp70 and GroEL/ES.
Explain why β sheets are less likely to form than α helices during the earliest stages of protein folding.
Collagen IV, which occurs in basement membranes, contains a sulfilimine bond (colored red in the structure below) that crosslinks twocollagen triple helices. Identify the parent amino acid residues thatparticipate in this linkage.
A number of human diseases are caused by point mutations that alter a single amino acid in a polypeptide. (a) Explain how such a small change in a collagen subunit can destabilize the entire collagen structure. (b) Investigate how an amino acid substitution in an enzyme can render the enzyme inactive. (c) Investigate how an amino acid substitution can affect a protein’s folding efficiency without affecting its ultimate structure or function.
The genetically engineered proteins that accumulate in bacterial inclusion bodies (Fig. 5-2) form amyloid structures. Such proteins are often difficult to recover in functional form from the bacteria. Explain.
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