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b) It's said that secondary structures form because of intra- and intermolecular hydrogen bonding involving the peptide bond. Describe what is going on to further stabilize secondary structure through these interactions.

b) It's said that secondary structures form because of intra- and intermolecular hydrogen bonding involving the peptide bond. Describe what is going on to further stabilize secondary structure through these interactions.

Biology 2e
Biology 2e
2nd Edition
ISBN:9781947172517
Author:Matthew Douglas, Jung Choi, Mary Ann Clark
Publisher:Matthew Douglas, Jung Choi, Mary Ann Clark
Chapter3: Biological Macromolecules
Section: Chapter Questions
Problem 23CTQ: Amino acids have the generic structure seen below, where R represents different carbon-based side...
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### Understanding Secondary Structure Stabilization Through Hydrogen Bonding **Question:** It's said that secondary structures form because of intra- and intermolecular hydrogen bonding involving the peptide bond. Describe what is going on to further stabilize secondary structure through these interactions. **Figure 1: Secondary Interactions Involving the Main Chain** - **Panel A:** Shows a structural model of an idealized β-sheet. It illustrates: - Conventional main-chain hydrogen bonds (black dashes) - C–H···O hydrogen bonds (green dashes) - C5 hydrogen bonds (blue dashes) - **Panel B:** Presents a structural model of an idealized α-helix, depicting: - Main-chain hydrogen bonds (black dashes) - n→π* interactions are indicated by blue arrows. - **Panels C & D:** Display orbital overlap that underlies the formation of n→π* interactions (Panel C) and C5 hydrogen bonds (Panel D). These visualizations help explain how hydrogen bonding and orbital interactions stabilize the structural integrity of proteins, emphasizing the roles of different interactions in maintaining the α-helix and β-sheet conformations.
Transcribed Image Text:### Understanding Secondary Structure Stabilization Through Hydrogen Bonding **Question:** It's said that secondary structures form because of intra- and intermolecular hydrogen bonding involving the peptide bond. Describe what is going on to further stabilize secondary structure through these interactions. **Figure 1: Secondary Interactions Involving the Main Chain** - **Panel A:** Shows a structural model of an idealized β-sheet. It illustrates: - Conventional main-chain hydrogen bonds (black dashes) - C–H···O hydrogen bonds (green dashes) - C5 hydrogen bonds (blue dashes) - **Panel B:** Presents a structural model of an idealized α-helix, depicting: - Main-chain hydrogen bonds (black dashes) - n→π* interactions are indicated by blue arrows. - **Panels C & D:** Display orbital overlap that underlies the formation of n→π* interactions (Panel C) and C5 hydrogen bonds (Panel D). These visualizations help explain how hydrogen bonding and orbital interactions stabilize the structural integrity of proteins, emphasizing the roles of different interactions in maintaining the α-helix and β-sheet conformations.
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