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13 Cards in this Set
- Front
- Back
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Secondary protein structure include?
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helices, sheets and turns
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The peptide group has what type of structure as a result of what?
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a rigid planar structure as a consequence of resonance interactions that give the peptide bond about 40% double-bond character
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The planar conformation maximizes pi-bonding overlap, which accounts for what?
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Peptide group's rigidity
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Peptide groups prefer what conformation?
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trans conformation
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Why is the cis conformation less stable?
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steric hindrance
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The backbone or main chain of a protein refers to what atoms?
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only those that participate in peptide bonds (you ignore the side chains of the amino acids)
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The conformation of the backbone can be described by what?
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torsion angles, aka. dihedral angles
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Phi and theta are defined as what when polypeptide is in its fully extended version?
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180
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The Ramachandran diagram does what?
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indicates allowed confromations of polypeptides
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What is the most conformationally restricted resticteed amino acid?
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Pro- Phi angles are limited to -60
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What is the only residue without a beta carbon?
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Gly
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What is the least conformationally hindered amino acid?
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Gly- covers large area of the Ramachandran diagram
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What are regular secondary structures?
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alpha helix and beta sheet
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