// standard protein backbone bond lengths

bond    N   CA  1.458
bond    CA  C   1.525
bond    C   N   1.329
bond    C   O   1.231
bond    CA  CB  1.531
bond    N   HN  0.980
bond    CA  HA  1.080

// standard (ideal) protein backbone angles from E&H

angle   C   N   CA  121.7
angle   N   CA  C   111.2   
angle   C   CA  CB  110.1
angle   CA  C   O   120.8   
angle   CA  C   N   116.2   
angle   N   C   O   123.0   
angle   N   CA  CB  110.5   

// standard backbone angles

angle   HN  N   CA  119.1406
angle   C   N   HN  119.1044
angle   N   CA  HA  109.4712   

// This makes the peptide plane slightly non-planar. setting each to +/-180 will enforce planarity

dihedral    C   N   CA  HN  -179.980    // this makes N to be slightly off from the peptide plane
dihedral    CA  C   N   O   -179.800    // this makes O to be slightly off from the peptide plane
dihedral    CA  C   N   CA  179.200     // the peptide chain omega angle

// standard dihedral angles

dihedral    C   N   CA  HA   118.7     // C here has the same residue number as other atoms
dihedral    C   N   CA  CB   -122.4    // C here has the same residue number as other atoms
dihedral    HA  N   CA  CB   118.9     // C here has the same residue number as other atoms

