Silk is composed of -sheets whose polypeptide chains consist of the repeating sequence GlySer-Gly-Ala-Gly-Ala. What characteristics of

Silk is composed of β-sheets whose polypeptide chains consist of the repeating sequence GlySer-Gly-Ala-Gly-Ala. What characteristics of amino acid side chains appear to favor the β-sheet configuration? Do the illustrations of b-sheet structures (Figure 26-3) suggest an explanation for this preference?

Figure 26-3

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H. H 'N. H) H H H R R (H) H (H) H) R H (H)