The carbon-nitrogen peptide bond is rigid, but rotation can take place about the N-Co and the Co-C bonds in a protein (Co is the a carbon atom). These bond angles define the conformation of the peptide chain. Consider the Ramachandran plot to answer both questions. Which observation most likely describes part of an observed a helix? = -60°; y = -47°; many Ala residues = 59°; y = +150°; many Ser residues = -57°; y = -47°; many Pro residues = -140°; y = +130°; many Val residues = +60°; y = +40°; many Gly residues (degrees) 180 120 60 0 -60 -120 -180 -180 0 (degrees) 180

Principles of Modern Chemistry
8th Edition
ISBN:9781305079113
Author:David W. Oxtoby, H. Pat Gillis, Laurie J. Butler
Publisher:David W. Oxtoby, H. Pat Gillis, Laurie J. Butler
Chapter23: Polymeric Materials And Soft Condensed Matter
Section: Chapter Questions
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The carbon-nitrogen peptide bond is rigid, but rotation can
take place about the N-C, and the Co-C bonds in a protein
(Co is the a carbon atom). These bond angles define the
conformation of the peptide chain.
Consider the Ramachandran plot to answer both questions.
Which observation most likely describes part of an
observed a helix?
= −60°; y = −47°; many Ala residues
-59°; y = +150°; many Ser residues
-57°; y = -47°; many Pro residues
-140°; y = +130°; many Val residues
+60°; y = +40°; many Gly residues
Φ
$ =
Φ
$ =
=
=
(degrees)
180
120
60
O
-60
-120
-180
-180
0
(degrees)
180
Transcribed Image Text:The carbon-nitrogen peptide bond is rigid, but rotation can take place about the N-C, and the Co-C bonds in a protein (Co is the a carbon atom). These bond angles define the conformation of the peptide chain. Consider the Ramachandran plot to answer both questions. Which observation most likely describes part of an observed a helix? = −60°; y = −47°; many Ala residues -59°; y = +150°; many Ser residues -57°; y = -47°; many Pro residues -140°; y = +130°; many Val residues +60°; y = +40°; many Gly residues Φ $ = Φ $ = = = (degrees) 180 120 60 O -60 -120 -180 -180 0 (degrees) 180
Which observations would not likely occur in a ẞ sheet?
= +60°; y = +60°; many Gly residues
þ = −57°; y = −49°; many Ala residues
= -139°; y = +135°; many Val residues
= -120°; y = +120°; many Tyr residues
Φ = -51°; y = +153°; many Gly and Pro residues
Transcribed Image Text:Which observations would not likely occur in a ẞ sheet? = +60°; y = +60°; many Gly residues þ = −57°; y = −49°; many Ala residues = -139°; y = +135°; many Val residues = -120°; y = +120°; many Tyr residues Φ = -51°; y = +153°; many Gly and Pro residues
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