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Lecture

9-13-12.docx

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Department
Biology
Course Code
BIO-0013
Professor
Mc Vey

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Bio 13 9-13-12
e- resonance gives peptide bond partial double bond character
ono rotation around peptide bond
oN-C-C (no rotation) N-C-C (no rotation) N-C-C
oRotation= torsional angles
Amino (N) terminus is at right, carboxyl (C) terminus is at left
o4 planes because they are fixed by peptide bond restrictions
Ramachandran
plot shows
possible angle
values
(energetically
favorable)
o
o
o
o
o
o
o
o
o
o
o
o
o
Glycine shows up all over the plot b/c its R group has 2 hydrogens and is very
small allowing for more movement
Steric hindrance
oDisfavored phi and psi angles of rotation are when atoms get too close and
could collide, resulting in a loss of energy
Secondary structure
oA-helix
H-bonds and minimization of steric interaction between R groups
provides stabilization

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Description
Bio 13  9­13­12 • e­ resonance gives peptide bond partial double bond character o no rotation around peptide bond o N­C­C (no rotation) N­C­C (no rotation) N­C­C o Rotation= torsional angles • Amino (N) terminus is at right, carboxyl (C) terminus is at left o 4 planes because they are fixed by peptide bond restrictions • Ramachandran  plot shows  possible angle  values  (energetically  favorable) o o o o o o o o o o o o o Glycine shows up all over the plot b/c its R group has 2 hydrogens and is 
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