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Which of the following polypeptides is most likely to form an alpha helix? Explain? a) Cys-Arg-Ala-Gly-Asn-Arg-Lys-Ile-Leu-Glu-Thr-Tyr...

Which of the following polypeptides is most likely to form an alpha helix? Explain? a) Cys-Arg-Ala-Gly-Asn-Arg-Lys-Ile-Leu-Glu-Thr-Tyr b) Ser-Glu-Asp-Asn-Phe-Gly-Ala-Pro-Lys-Ser-Ille-Leu-Trp c) Gln-Lys-Ala-Ser-Val-Glu-Met-Ala-Val-Arg-Asn-Ser-Gly

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Answer #1

Gln-Lys-Ala-Ser-Val-Glu-Met-Ala-Val-Arg-Asn-Ser-Gly

Different amino-acid sequences have different propensities for forming ?-helical structure. Methionine, alanine, leucine, unchargedglutamate, and lysine ("MALEK" in the amino-acid 1-letter codes) all have especially high helix-forming propensities, whereasproline and glycine have poor helix-forming propensities.[23] Proline either breaks or kinks a helix, both because it cannot donate an amide hydrogen bond (having no amide hydrogen), and also because its sidechain interferes sterically with the backbone of the preceding turn - inside a helix, this forces a bend of about 30

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