Contacts of the helix formed by residues 4324 - 4350 (chain B) in PDB entry 5NUG


Residue contacts within the protein are derived with the CSU software (Sobolev V., Sorokine A., Prilusky J., Abola E.E. and Edelman M. (1999) Automated analysis of interatomic contacts in proteins. Bioinformatics, 15, 327-332). A short description of the analytical approach is given at the end of the page.
For CSU analysis of other PDB entry

Note:
Non-standard 3 letter residue codes indicate a heterogroup. To identify and analyse, use LPC software

Legend:
Dist - nearest distance (Å) between atoms of two residues
Surf - contact surface area (Å2) between two residues
HB   - hydrophilic-hydrophilic contact (hydrogen bond)
Arom - aromatic-aromatic contact
Phob - hydrophobic-hydrophobic contact
DC   - hydrophobic-hydrophilic contact (destabilizing contact)
+/-  - indicates presence/absence of a specific contacts
*    - indicates residues forming contacts  by their side chain
       (including CA atoms)
Residues in contact with PRO4324 (chain B).
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
   4199B  LEU*     5.2     7.2    -      -       +      -
   4318B  PRO*     3.9     8.9    -      -       -      +
   4323B  LEU*     1.3    99.7    -      -       +      +
   4325B  ASN*     1.3    64.1    +      -       -      +
   4326B  ASN*     3.3     5.2    -      -       +      +
   4327B  ALA*     3.5    27.5    +      -       +      +
   4567B  GLY*     5.3     9.0    -      -       -      -
   4578B  SER      5.0     0.2    -      -       -      +
   4579B  ASN*     4.6    12.1    -      -       -      +
   4580B  ALA      5.6     1.1    -      -       -      +
   4638B  ARG*     3.5    50.0    -      -       +      +
----------------------------------------------------------
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Residues in contact with ASN4325 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
   4287B  LYS      4.3     3.4    +      -       -      -
   4288B  VAL*     5.4     9.8    -      -       -      +
   4289B  ASP      5.7     1.2    +      -       -      -
   4317B  THR*     3.7    24.0    +      -       -      +
   4318B  PRO*     3.9    13.2    -      -       +      +
   4319B  SER*     3.3    34.6    +      -       -      +
   4323B  LEU      3.8     2.6    -      -       -      +
   4324B  PRO*     1.3    72.6    -      -       -      +
   4326B  ASN*     1.3    69.0    +      -       -      +
   4327B  ALA      3.4     0.3    +      -       -      -
   4328B  GLU*     3.7     2.6    +      -       -      +
   4329B  ARG*     3.7    15.1    +      -       -      +
   4579B  ASN*     5.1    14.1    +      -       +      +
   4638B  ARG*     5.8     0.2    +      -       -      -
----------------------------------------------------------
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Residues in contact with ASN4326 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
   4324B  PRO*     3.3     2.3    -      -       +      +
   4325B  ASN*     1.3    82.2    -      -       -      +
   4327B  ALA*     1.3    63.4    +      -       -      +
   4329B  ARG*     3.4    44.4    +      -       -      +
   4330B  VAL*     4.1     7.3    +      -       -      +
   4579B  ASN*     3.4    38.9    +      -       -      +
   4580B  ALA*     4.6     5.3    -      -       -      +
   4581B  ILE*     4.4    20.5    -      -       +      +
----------------------------------------------------------
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Residues in contact with ALA4327 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
   4196B  TYR*     5.6     8.3    -      -       +      -
   4199B  LEU*     3.6    30.3    -      -       +      -
   4318B  PRO*     5.9     1.3    -      -       +      -
   4323B  LEU*     5.7     3.4    -      -       +      -
   4324B  PRO*     3.5    25.3    +      -       +      +
   4325B  ASN      3.2     0.8    -      -       -      -
   4326B  ASN*     1.3    79.6    -      -       -      +
   4328B  GLU*     1.3    61.7    +      -       -      +
   4329B  ARG      3.3     0.7    +      -       -      -
   4330B  VAL*     3.8    13.0    +      -       -      +
   4331B  LEU*     4.2     3.6    +      -       -      +
   4581B  ILE*     5.8     3.1    -      -       -      -
----------------------------------------------------------
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Residues in contact with GLU4328 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
   4196B  TYR*     3.4    39.5    -      -       +      +
   4318B  PRO*     3.6    25.4    -      -       +      -
   4324B  PRO      4.4     0.4    +      -       -      -
   4325B  ASN      3.7     3.1    +      -       -      +
   4327B  ALA*     1.3    78.5    -      -       -      +
   4329B  ARG*     1.3    58.8    +      -       -      +
   4330B  VAL      3.3     0.2    -      -       -      -
   4331B  LEU*     3.2     9.2    +      -       -      +
   4332B  LEU*     2.9    39.9    +      -       +      +
----------------------------------------------------------
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Residues in contact with ARG4329 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
   3997B  ARG*     5.1    12.9    -      -       -      +
   3998B  PRO*     6.0     2.2    -      -       -      -
   3999B  ASP*     3.6    32.1    -      -       +      +
   4325B  ASN      3.7     6.1    +      -       -      +
   4326B  ASN*     3.4    42.4    +      -       -      +
   4327B  ALA      3.2     0.4    -      -       -      -
   4328B  GLU*     1.3    77.0    -      -       -      +
   4330B  VAL*     1.3    71.8    +      -       -      +
   4332B  LEU*     3.2    13.5    +      -       -      +
   4333B  THR*     2.9    37.0    +      -       -      -
   4581B  ILE*     4.0    24.5    -      -       -      +
----------------------------------------------------------
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Residues in contact with VAL4330 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
   4326B  ASN      4.4     7.6    -      -       -      +
   4327B  ALA      3.8     8.0    +      -       -      +
   4329B  ARG*     1.3    95.9    -      -       -      +
   4331B  LEU*     1.3    52.7    +      -       -      +
   4333B  THR*     3.2    10.2    +      -       -      -
   4334B  THR*     2.7    42.5    +      -       -      +
   4581B  ILE*     4.9    12.8    -      -       +      -
----------------------------------------------------------
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Residues in contact with LEU4331 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
   3878B  GLN*     5.8     3.6    -      -       -      +
   4195B  ARG*     4.1    20.9    -      -       +      +
   4196B  TYR*     4.1    29.4    -      -       +      -
   4327B  ALA      4.2     2.8    +      -       -      +
   4328B  GLU*     3.2    14.5    +      -       -      +
   4330B  VAL*     1.3    80.4    -      -       -      +
   4332B  LEU*     1.3    57.9    +      -       +      +
   4334B  THR*     3.2    14.3    +      -       +      +
   4335B  GLN*     2.9    49.7    +      -       +      +
----------------------------------------------------------
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Residues in contact with LEU4332 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
   3998B  PRO      5.0     0.2    -      -       -      +
   3999B  ASP*     3.4    20.7    -      -       -      +
   4000B  ARG*     4.0    33.9    -      -       -      +
   4001B  LEU*     5.7     0.2    -      -       -      +
   4002B  LEU*     4.2    25.6    -      -       +      +
   4196B  TYR*     6.0     3.4    -      -       +      -
   4318B  PRO*     6.0     2.7    -      -       +      -
   4328B  GLU*     2.9    31.8    +      -       +      +
   4329B  ARG*     3.2    10.5    +      -       -      +
   4331B  LEU*     1.3    76.8    -      -       +      +
   4333B  THR*     1.3    57.1    +      -       -      +
   4335B  GLN*     3.2    15.4    +      -       -      +
   4336B  GLY*     2.9    25.8    +      -       -      -
----------------------------------------------------------
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Residues in contact with THR4333 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
   3998B  PRO*     3.9    35.4    -      -       +      +
   3999B  ASP*     3.3    16.5    +      -       -      +
   4329B  ARG*     2.9    21.7    +      -       -      -
   4330B  VAL*     3.2    12.2    +      -       -      -
   4332B  LEU*     1.3    74.6    -      -       -      +
   4334B  THR*     1.3    58.3    +      -       -      +
   4336B  GLY*     3.2     2.4    +      -       -      -
   4337B  VAL*     2.9    42.8    +      -       +      +
----------------------------------------------------------
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Residues in contact with THR4334 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
   4330B  VAL*     2.7    29.3    +      -       -      +
   4331B  LEU*     3.3    15.0    -      -       +      +
   4333B  THR*     1.3    78.2    -      -       -      +
   4335B  GLN*     1.3    57.6    +      -       -      +
   4337B  VAL*     3.2     8.1    +      -       +      +
   4338B  ASP*     2.9    46.4    +      -       -      +
----------------------------------------------------------
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Residues in contact with GLN4335 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
   3877B  HIS      5.6     0.2    -      -       -      +
   3878B  GLN*     4.2    45.4    -      -       +      +
   3881B  ILE*     5.6     0.7    -      -       -      +
   4002B  LEU*     3.2    28.6    -      -       +      +
   4331B  LEU*     2.9    39.2    +      -       +      +
   4332B  LEU*     3.4    17.7    -      -       -      +
   4334B  THR*     1.3    77.9    -      -       -      +
   4336B  GLY*     1.3    55.8    +      -       -      +
   4338B  ASP*     3.2    11.2    +      -       -      +
   4339B  MET*     2.9    28.9    +      -       -      +
----------------------------------------------------------
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Residues in contact with GLY4336 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
   3998B  PRO      5.4     0.2    -      -       -      -
   4001B  LEU*     3.7    27.6    -      -       -      +
   4002B  LEU*     3.9    14.1    -      -       -      +
   4332B  LEU      2.9    13.8    +      -       -      -
   4333B  THR*     3.6     4.3    -      -       -      -
   4335B  GLN*     1.3    74.9    -      -       -      +
   4337B  VAL*     1.3    57.9    +      -       -      +
   4339B  MET*     3.2     4.7    +      -       -      +
   4340B  ILE*     2.9    32.3    +      -       -      +
----------------------------------------------------------
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Residues in contact with VAL4337 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
   3998B  PRO*     6.3     0.7    -      -       +      -
   4333B  THR*     2.9    28.7    +      -       +      +
   4334B  THR*     3.2    12.3    +      -       +      +
   4336B  GLY*     1.3    75.2    -      -       -      +
   4338B  ASP*     1.3    61.4    +      -       -      +
   4340B  ILE*     3.2    10.4    +      -       +      +
   4341B  SER*     2.9    38.1    +      -       -      +
----------------------------------------------------------
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Residues in contact with ASP4338 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
   3821B  ILE*     5.5     0.7    -      -       -      +
   3878B  GLN*     4.9     8.0    -      -       -      +
   3879B  ASP*     6.1     0.4    -      -       -      +
   4334B  THR*     2.9    31.2    +      -       -      +
   4335B  GLN*     3.2    11.8    +      -       -      +
   4337B  VAL*     1.3    79.8    -      -       -      +
   4339B  MET*     1.3    58.4    +      -       -      +
   4341B  SER*     3.2     9.9    +      -       -      -
   4342B  LYS*     2.9    27.8    +      -       -      +
----------------------------------------------------------
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Residues in contact with MET4339 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
   3878B  GLN      5.3     4.9    -      -       -      +
   3881B  ILE*     3.4    40.4    -      -       +      -
   3882B  THR*     3.4    29.8    -      -       +      +
   3885B  MET*     3.4    24.2    -      -       +      +
   3908B  PHE*     5.7     2.2    -      -       -      -
   4001B  LEU*     4.9     9.9    -      -       -      -
   4002B  LEU*     3.4    26.5    -      -       +      -
   4005B  ALA*     4.5    10.8    -      -       +      -
   4335B  GLN      2.9    12.7    +      -       -      +
   4336B  GLY      3.3     9.9    -      -       -      +
   4338B  ASP*     1.3    75.5    -      -       -      +
   4340B  ILE*     1.3    61.8    +      -       +      +
   4342B  LYS*     3.2     5.1    +      -       -      +
   4343B  MET*     2.9    32.7    +      -       -      +
----------------------------------------------------------
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Residues in contact with ILE4340 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
   3908B  PHE*     3.4    37.0    -      -       +      +
   3909B  LEU*     3.5    27.1    -      -       +      +
   3912B  ASN*     5.2     5.6    -      -       +      -
   3994B  GLN*     3.2    29.8    -      -       -      +
   4001B  LEU*     4.1    10.1    -      -       +      -
   4336B  GLY      2.9    18.5    +      -       -      +
   4337B  VAL*     3.2    12.5    +      -       +      +
   4339B  MET*     1.3    80.3    -      -       +      +
   4341B  SER*     1.3    58.0    +      -       -      +
   4343B  MET*     3.2     8.0    +      -       +      +
   4344B  LEU*     2.9    28.6    +      -       +      +
----------------------------------------------------------
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Residues in contact with SER4341 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
   4337B  VAL*     2.9    23.6    +      -       -      +
   4338B  ASP*     3.4    12.9    -      -       -      -
   4340B  ILE*     1.3    79.1    -      -       -      +
   4342B  LYS*     1.3    60.9    +      -       -      +
   4344B  LEU*     3.2    14.2    +      -       -      +
   4345B  LYS*     3.0    43.2    +      -       -      +
----------------------------------------------------------
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Residues in contact with LYS4342 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
   3818B  LEU*     3.4    20.8    -      -       -      +
   3821B  ILE*     2.5    46.0    -      -       +      +
   3875B  MET*     3.9     3.4    -      -       -      +
   3879B  ASP*     3.2    20.2    +      -       +      +
   3882B  THR*     2.4    42.1    +      -       +      +
   3883B  PHE      3.9     2.8    -      -       -      +
   3886B  LEU*     4.6     4.9    -      -       -      -
   4338B  ASP      2.9    13.3    +      -       -      +
   4339B  MET*     3.4    10.3    -      -       -      +
   4341B  SER*     1.3    77.2    -      -       -      +
   4343B  MET*     1.3    62.1    -      -       -      +
   4345B  LYS*     3.2    13.0    +      -       +      +
   4346B  MET*     3.1    51.3    +      -       +      +
----------------------------------------------------------
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Residues in contact with MET4343 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
   3882B  THR*     4.1     9.2    -      -       -      +
   3885B  MET*     3.6    45.8    -      -       +      -
   3886B  LEU*     3.5    42.6    -      -       +      +
   3889B  ARG*     4.7     3.3    +      -       -      +
   3905B  PHE*     4.1    21.1    -      -       +      -
   3909B  LEU*     3.6    28.4    -      -       +      +
   4339B  MET*     2.9    18.6    +      -       +      +
   4340B  ILE*     3.5     9.6    -      -       +      +
   4342B  LYS*     1.3    76.4    -      -       -      +
   4344B  LEU*     1.3    57.7    +      -       -      +
   4346B  MET*     3.2     6.6    +      -       -      +
   4347B  GLN*     2.9    28.2    +      -       -      +
----------------------------------------------------------
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Residues in contact with LEU4344 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
   3906B  GLN*     6.0     0.2    -      -       -      +
   3909B  LEU*     4.3    11.8    -      -       +      +
   3910B  ARG*     3.6    50.3    -      -       +      +
   4340B  ILE*     2.9    14.5    +      -       +      +
   4341B  SER*     3.2    14.3    +      -       -      +
   4343B  MET*     1.3    76.5    -      -       -      +
   4345B  LYS*     1.3    57.9    +      -       +      +
   4347B  GLN*     3.2    10.1    +      -       +      +
   4348B  MET*     2.9    30.3    +      -       +      +
----------------------------------------------------------
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Residues in contact with LYS4345 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
   3820B  GLN*     3.8    37.6    -      -       +      +
   3821B  ILE*     6.2     3.8    -      -       +      -
   4341B  SER*     3.0    40.3    +      -       -      +
   4342B  LYS*     3.3    13.0    -      -       +      +
   4344B  LEU*     1.3    78.2    -      -       +      +
   4346B  MET*     1.3    66.1    +      -       -      +
   4348B  MET*     3.2    17.4    +      -       -      +
   4349B  LEU*     3.3    18.6    +      -       -      +
----------------------------------------------------------
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Residues in contact with MET4346 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
   3814B  THR*     4.6     4.0    -      -       +      +
   3817B  SER*     3.6    30.4    +      -       -      +
   3818B  LEU*     3.7    35.0    -      -       +      +
   3820B  GLN*     5.1     2.9    -      -       -      -
   3821B  ILE*     4.7     4.5    -      -       +      -
   3886B  LEU*     4.0    34.1    -      -       +      -
   3889B  ARG*     5.6     4.4    +      -       -      +
   4342B  LYS*     3.1    46.8    +      -       +      +
   4343B  MET*     3.4     8.3    -      -       -      +
   4345B  LYS*     1.3    83.9    -      -       -      +
   4347B  GLN*     1.3    61.8    +      -       -      +
   4349B  LEU*     3.4     6.9    +      -       -      +
   4350B  GLU*     3.3    18.8    +      -       -      +
----------------------------------------------------------
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Residues in contact with GLN4347 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
   3889B  ARG*     2.7    31.5    +      -       -      +
   3905B  PHE*     5.6     1.1    -      -       -      -
   3906B  GLN*     3.3    35.3    +      -       -      +
   3909B  LEU*     3.4    30.5    -      -       +      -
   3910B  ARG*     6.4     0.2    -      -       -      +
   4343B  MET      2.9     7.8    +      -       -      +
   4344B  LEU*     3.2    15.9    +      -       +      +
   4346B  MET*     1.3    76.5    -      -       -      +
   4348B  MET*     1.3    63.3    +      -       -      +
   4350B  GLU*     3.2    26.7    +      -       -      +
----------------------------------------------------------
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Residues in contact with MET4348 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
   3164B  ARG*     5.5     4.7    +      -       -      -
   3910B  ARG*     6.0     4.5    -      -       -      +
   4344B  LEU*     2.9    16.8    +      -       +      +
   4345B  LYS*     3.2    13.7    +      -       -      +
   4347B  GLN*     1.3    78.5    -      -       -      +
   4349B  LEU*     1.3    64.7    +      -       +      +
   4350B  GLU      4.0     3.6    -      -       -      -
----------------------------------------------------------
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Residues in contact with LEU4349 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
   3164B  ARG*     5.9    12.8    -      -       +      +
   3523B  GLN*     5.0     7.1    +      -       -      +
   3817B  SER*     2.1    43.3    -      -       -      +
   3820B  GLN*     4.4    20.2    -      -       +      +
   4345B  LYS      3.3    12.5    +      -       -      +
   4346B  MET*     3.6     8.5    -      -       -      +
   4347B  GLN      3.2     0.4    -      -       -      -
   4348B  MET*     1.3    82.1    -      -       +      +
   4350B  GLU*     1.3    62.6    +      -       -      +
----------------------------------------------------------
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Residues in contact with GLU4350 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
   3523B  GLN*     4.7    12.1    +      -       -      +
   3705B  ARG*     4.8    16.5    +      -       -      +
   3889B  ARG*     5.1     7.9    -      -       -      +
   4346B  MET      3.3     8.9    +      -       -      +
   4347B  GLN*     3.2    29.5    +      -       -      +
   4348B  MET      4.0     3.8    -      -       -      -
   4349B  LEU*     1.3    84.2    -      -       -      +
----------------------------------------------------------
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A short description of the analytical approach
The contact analysis used in this page is based upon the approach developed in: Sobolev V., Wade R.C., Vriend G. and Edelman M. PROTEINS (1996) 25, 120-129. Contact legitimacy depends on the hydrophobic-hydrophilic properties of the contacting atoms. In order to define it, for each inter-atomic contact, eight atom classes have been introduced:


   I  Hydrophilic      - N and O that can donate and accept hydrogen bonds
                         (e.g., oxygen of hydroxyl group of Ser. or Thr)
  II  Acceptor         - N or O that can only accept a hydrogen bond
 III  Donor            - N that can only donate a hydrogen bond
  IV  Hydrophobic      - Cl, Br, I and all C atoms that are not in
                         aromatic rings and do not have a covalent bond to
                         a N or O atom
   V  Aromatic         - C in aromatic rings irrespective of any other 
                         bonds formed by the atom
  VI  Neutral          - C atoms that have a covalent bond to at least one
                         atom of class I or two or more atoms from class II
                         or III; atoms; S, F, P, and metal atoms in all cases
 VII  Neutral-donor    - C atoms that have a covalent bond with only one
                         atom of class III
VIII  Neutral-acceptor - C atoms that have a covalent bond with only 
                         one atom of class II
For each pair of contacts the state of legitimacy is shown below:

Legend:
+, legitimate
-, illegitimate
------------------------------------------------------------
  Atomic class           I  II  III   IV   V   VI  VII  VIII
------------------------------------------------------------
   I  (Hydrophilic)      +   +    +    -   +   +    +    +
  II  (Acceptor)         +   -    +    -   +   +    +    -
 III  (Donor)            +   +    -    -   +   +    -    +
  IV  (Hydrophobic)      -   -    -    +   +   +    +    +
   V  (Aromatic)         +   +    +    +   +   +    +    +
  VI  (Neutral)          +   +    +    +   +   +    +    +
 VII  (Neutral-donor)    +   +    -    +   +   +    -    +
VIII  (Neutral-acceptor) +   -    +    +   +   +    +    -
------------------------------------------------------------
Warning!
Atom classes for heterogroups are automatically assigned based on the atomic coordinates. However, in three cases (see below) the automatic assignment is currently ambiguous. In these cases, the user is advised to manually analyse the full list of contacts using LPC software.
1. Carbon atoms belonging to a 4-, 5- or 6-member ring are 
   considered "aromatic" (Class V) if the ring is approximately
   planar, and "hydrophobic" (Class IV) or "neutral" (Classes
   VI, VII, VIII) if the ring is non-planar.
2. The oxygen atom of a carbonyl or hydroxy group is considered
   "hydroxy" (Class I) if the CO bond is longer than 1.29 Å, and
   "carbonyl" (Class II) if shorter.
3. All nitrogen atoms are considered "hydrophilic" (Class I).

Please E-mail any questions and/or suggestions concerning this page to Vladimir.Sobolev@weizmann.ac.il