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Proline is sometimes found as one of the first four residues of an alpha helix. Proline is less frequently found in the center of a helix, but is also relatively often observed as the first non-helical residue after the end of a helix Why is this true? Select one: a. Proline cannot hydrogen bond, and therefore it does not participate in secondary structure. b. Proline is too flexible to fit properly into a helix, and therefore is rarely found in helix structures for entropic reasons. O c. When part of a polypeptide, proline lacks the amide proton. Therefore, in a helix, it does not hydrogen bond to residues earlier in the helix. However, the first four residues of a helix by definition cannot hydrogen bond to earlier residues in the helix, so this does not matter. O d. Proline cannot adopt the phi and psi angles necessary to fit properly into a helix. e. Proline is a rare amino acid and therefore it rarely is found anywhere.

Proline is sometimes found as one of the first four residues of an alpha helix. Proline is less frequently found in the center of a helix, but is also relatively often observed as the first non-helical residue after the end of a helix Why is this true? Select one: a. Proline cannot hydrogen bond, and therefore it does not participate in secondary structure. b. Proline is too flexible to fit properly into a helix, and therefore is rarely found in helix structures for entropic reasons. O c. When part of a polypeptide, proline lacks the amide proton. Therefore, in a helix, it does not hydrogen bond to residues earlier in the helix. However, the first four residues of a helix by definition cannot hydrogen bond to earlier residues in the helix, so this does not matter. O d. Proline cannot adopt the phi and psi angles necessary to fit properly into a helix. e. Proline is a rare amino acid and therefore it rarely is found anywhere.

Biochemistry
Biochemistry
9th Edition
ISBN:9781319114671
Author:Lubert Stryer, Jeremy M. Berg, John L. Tymoczko, Gregory J. Gatto Jr.
Publisher:Lubert Stryer, Jeremy M. Berg, John L. Tymoczko, Gregory J. Gatto Jr.
Chapter1: Biochemistry: An Evolving Science
Section: Chapter Questions
Problem 1P
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Proline is sometimes found as one of the first four residues of an alpha helix. Proline is less frequently found in the center of a helix, but is also relatively often observed as the first non-helical residue after the end of a helix. Why is this true? Select one: a. Proline cannot hydrogen bond, and therefore it does not participate in secondary structure. O b. Proline is too flexible to fit properly into a helix, and therefore is rarely found in helix structures for entropic reasons. c. When part of a polypeptide, proline lacks the amide proton. Therefore, in a helix, it does not hydrogen bond to residues earlier in the helix. However, the first four residues of a helix by definition cannot hydrogen bond to earlier residues in the helix, so this does not matter. d. Proline cannot adopt the phi and psi angles necessary to fit properly into a helix. e. Proline is a rare amino acid and therefore it rarely is found anywhere.
Transcribed Image Text:Proline is sometimes found as one of the first four residues of an alpha helix. Proline is less frequently found in the center of a helix, but is also relatively often observed as the first non-helical residue after the end of a helix. Why is this true? Select one: a. Proline cannot hydrogen bond, and therefore it does not participate in secondary structure. O b. Proline is too flexible to fit properly into a helix, and therefore is rarely found in helix structures for entropic reasons. c. When part of a polypeptide, proline lacks the amide proton. Therefore, in a helix, it does not hydrogen bond to residues earlier in the helix. However, the first four residues of a helix by definition cannot hydrogen bond to earlier residues in the helix, so this does not matter. d. Proline cannot adopt the phi and psi angles necessary to fit properly into a helix. e. Proline is a rare amino acid and therefore it rarely is found anywhere.
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