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Unformatted text preview: • covalent; kinetically stable • planar in geometry and rigid • partial double bond character--resonance • trans configuration Phi( φ ) and Psi( ψ ) Bond Angles • Phi( φ ) refers to angle of rotation about bond between nitrogen and α-carbon. • Psi( ψ ) refers to angle of rotation about bond between carbonyl and α-carbon . Significance of φ and ψ angles • rotation about these bonds permits proteins to fold in different ways--however, not all combinations are permissible due to steric hindrance • Suggests 2 important points with regard to protein structure: a) steric exclusion as an organizing principle b) restricted set φ and ψ angles limits number of possible structures...
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- Spring '12
- Biochemistry, peptide bond