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13 Cards in this Set

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