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Disulfide Bonds Determine the Properties of Many Proteins Some natural proteins are rich in disulfide bonds, and their mechanical properties (tensile strength, viscosity, hardness, etc.) are correlated with the degree of disulfide bonding. (a) Glutenin, a wheat protein rich in disulfide bonds, is responsible for the cohesive and elastic character of dough made from wheat flour. Similarly, the hard, tough nature of tortoise shell is due to the extensive disulfide bonding in its? What is the molecular basis for the correlation between disulfide-bond content and mechanical properties of the protein?
(b) Most globular proteins are denatured and lose their activity when briefly heated to 65°C. However, globular pro- teins that contain multiple disulfide bonds often must be heated longer at higher temperatures to denature them. One such protein isbovine pancreatic trypsin inhibitor (BPTD which has 58 amino acid residues in a single chain and con- tains three disulfide bonds. On cooling a solution of denatured BPTI, the activity of the protein is restored. What is the molecular basis for this property?
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