Contacts of the helix formed by residues 327 - 350 (chain P) in PDB entry 2QJK


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 ASP 327 (chain P).
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    168O  PRO*     3.7    24.9    -      -       +      +
    315P  VAL*     4.8     2.5    -      -       -      -
    319P  ASN*     4.0    15.7    -      -       -      +
    324P  GLY      3.1    12.7    +      -       -      +
    325P  ILE      3.1     6.9    +      -       -      -
    326P  ILE*     1.3    74.5    -      -       -      +
    328P  ALA*     1.3    65.6    +      -       -      +
    329P  LYS*     3.1    19.7    +      -       -      +
    330P  PHE*     3.1    13.7    +      -       -      +
    331P  PHE*     2.9    24.1    +      -       -      +
----------------------------------------------------------
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Residues in contact with ALA 328 (chain P). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    166O  PRO*     4.1    13.7    -      -       +      +
    168O  PRO*     6.1     0.7    -      -       +      -
    308P  PHE      4.2     9.5    -      -       -      +
    309P  THR      3.8     6.7    -      -       -      +
    310P  ALA*     3.6    39.2    -      -       +      +
    315P  VAL*     4.0    12.0    -      -       +      +
    327P  ASP*     1.3    76.2    -      -       -      +
    329P  LYS*     1.3    66.6    +      -       -      +
    331P  PHE*     2.8     9.0    +      -       -      +
    332P  GLY*     2.7    22.3    +      -       -      -
----------------------------------------------------------
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Residues in contact with LYS 329 (chain P). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    130O  THR      2.8    18.9    +      -       -      +
    131O  HIS*     2.6    47.9    +      -       +      +
    132O  LEU*     4.6     4.7    -      -       +      -
    166O  PRO*     3.9    16.5    +      -       -      +
    168O  PRO*     4.1    14.7    -      -       +      +
    164P  GLY      5.2     1.1    -      -       -      -
    167P  GLY      4.8     5.2    +      -       -      -
    168P  ALA*     4.2    31.4    -      -       +      +
    305P  LEU*     5.4     0.3    -      -       -      +
    327P  ASP*     3.3    13.6    -      -       -      +
    328P  ALA*     1.3    82.1    -      -       -      +
    330P  PHE*     1.3    58.9    +      -       +      +
    332P  GLY*     3.0    13.0    +      -       -      -
    333P  VAL*     3.1    16.1    +      -       +      +
----------------------------------------------------------
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Residues in contact with PHE 330 (chain P). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    168P  ALA*     3.4    28.0    -      -       +      +
    169P  ILE*     4.0    15.3    -      -       +      -
    170P  PRO*     3.5    34.3    -      -       +      -
    325P  ILE*     4.3     7.0    -      -       +      +
    326P  ILE*     4.3    22.9    -      -       +      -
    327P  ASP*     3.1    12.9    +      -       -      +
    329P  LYS*     1.3    78.4    -      -       +      +
    331P  PHE*     1.3    59.9    +      -       -      +
    333P  VAL*     3.7    13.0    -      -       +      -
    334P  LEU*     2.8    76.7    +      -       +      +
----------------------------------------------------------
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Residues in contact with PHE 331 (chain P). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    308P  PHE*     3.3    53.4    -      +       +      -
    314P  VAL*     3.8    32.1    -      -       +      -
    315P  VAL*     4.0    10.8    -      -       +      -
    318P  ALA*     4.3    14.8    -      -       +      -
    326P  ILE*     4.1    19.0    -      -       +      +
    327P  ASP      2.9    15.6    +      -       -      +
    328P  ALA*     2.8    13.2    +      -       -      +
    330P  PHE*     1.3    75.0    -      -       -      +
    332P  GLY*     1.3    53.7    +      -       -      +
    334P  LEU*     2.9    13.8    +      -       +      +
    335P  ALA*     2.6    39.6    +      -       +      +
----------------------------------------------------------
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Residues in contact with GLY 332 (chain P). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    131O  HIS*     6.4     0.2    -      -       -      -
    305P  LEU*     3.6    37.8    -      -       -      +
    308P  PHE*     4.5     5.4    -      -       -      -
    328P  ALA      2.7    12.5    +      -       -      -
    329P  LYS      3.4     4.5    -      -       -      -
    331P  PHE*     1.3    80.1    -      -       -      +
    333P  VAL*     1.3    61.8    +      -       -      +
    335P  ALA*     3.2     8.6    +      -       -      +
    336P  MET*     3.0    18.4    +      -       -      +
----------------------------------------------------------
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Residues in contact with VAL 333 (chain P). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    131O  HIS*     6.1     0.9    -      -       -      +
    132O  LEU*     5.3     2.7    -      -       +      -
    165P  LEU*     4.1    32.1    -      -       +      +
    168P  ALA*     3.5    28.5    -      -       +      -
    169P  ILE*     6.0     2.2    -      -       +      +
    305P  LEU*     3.8     9.2    -      -       +      +
    329P  LYS*     3.1    11.7    +      -       +      +
    330P  PHE*     3.5    17.7    -      -       +      +
    331P  PHE      3.2     0.2    -      -       -      -
    332P  GLY*     1.3    75.1    -      -       -      +
    334P  LEU*     1.3    66.1    +      -       +      +
    336P  MET*     3.0    14.3    +      -       -      +
    337P  PHE*     3.1    40.0    +      -       +      -
----------------------------------------------------------
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Residues in contact with LEU 334 (chain P). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    326P  ILE*     4.4    16.4    -      -       +      -
    330P  PHE*     2.8    65.0    +      -       +      +
    331P  PHE*     3.3    11.2    -      -       +      +
    333P  VAL*     1.3    76.4    -      -       +      +
    335P  ALA*     1.3    54.1    +      -       -      +
    337P  PHE*     4.3     4.2    -      -       +      +
    338P  GLY*     2.7    35.7    +      -       -      -
----------------------------------------------------------
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Residues in contact with ALA 335 (chain P). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    304P  ILE*     3.9     7.0    -      -       +      +
    308P  PHE*     3.4    37.5    -      -       +      -
    331P  PHE*     2.6    25.4    +      -       +      +
    332P  GLY      3.4     5.8    -      -       -      +
    333P  VAL      3.1     0.2    -      -       -      -
    334P  LEU*     1.3    72.2    -      -       -      +
    336P  MET*     1.3    57.7    +      -       -      +
    339P  ALA*     2.8    25.1    +      -       -      +
    401P  PHE*     3.3    19.0    -      -       +      -
----------------------------------------------------------
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Residues in contact with MET 336 (chain P). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    165P  LEU*     3.8    22.9    -      -       +      -
    301P  PHE*     3.4    37.9    -      -       +      +
    304P  ILE*     4.2     7.6    -      -       -      +
    305P  LEU*     3.9    12.3    -      -       +      -
    332P  GLY      3.0    10.7    +      -       -      +
    333P  VAL*     3.0     8.3    +      -       -      +
    335P  ALA*     1.3    73.3    -      -       -      +
    337P  PHE*     1.3    86.4    +      -       +      +
    338P  GLY      2.9     0.7    -      -       -      -
    339P  ALA*     2.8    21.2    +      -       -      +
    340P  ILE*     3.3     7.7    +      -       -      +
    503P  SMA      3.3    60.3    -      -       -      +
----------------------------------------------------------
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Residues in contact with PHE 337 (chain P). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    137P  LEU*     5.8     4.9    -      -       +      -
    165P  LEU*     4.5    14.4    -      -       +      -
    166P  PHE*     4.6    18.2    -      +       -      -
    333P  VAL*     3.1    40.3    +      -       +      +
    334P  LEU*     4.3     4.0    -      -       +      +
    336P  MET*     1.3    94.4    -      -       +      +
    338P  GLY*     1.3    56.8    +      -       -      +
    340P  ILE*     3.1    13.3    +      -       +      +
    341P  LEU*     2.8    28.8    +      -       -      +
    503P  SMA      3.7    43.1    -      -       -      -
----------------------------------------------------------
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Residues in contact with GLY 338 (chain P). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    334P  LEU      2.7    24.7    +      -       -      -
    335P  ALA      3.8     0.4    -      -       -      -
    337P  PHE*     1.3    70.4    -      -       -      +
    339P  ALA*     1.3    66.0    +      -       -      +
    340P  ILE      2.9     0.3    +      -       -      -
    341P  LEU*     3.0    12.3    +      -       -      +
    342P  VAL*     2.8    29.9    +      -       -      +
    401P  PHE*     3.9     9.9    -      -       -      -
----------------------------------------------------------
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Residues in contact with ALA 339 (chain P). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    301P  PHE*     4.5     9.2    -      -       +      -
    304P  ILE*     3.8    17.5    -      -       +      -
    335P  ALA      2.8    14.3    +      -       -      +
    336P  MET*     2.8    15.3    +      -       -      +
    338P  GLY*     1.3    71.1    -      -       -      +
    340P  ILE*     1.3    59.0    +      -       -      +
    342P  VAL*     3.2    12.0    -      -       -      +
    343P  MET*     3.9     1.7    +      -       -      +
    400P  TRP*     2.9    38.4    +      -       +      +
    401P  PHE*     3.6    21.0    -      -       +      -
----------------------------------------------------------
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Residues in contact with ILE 340 (chain P). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    133P  MET*     3.8    21.9    -      -       +      +
    136P  TYR*     4.6     9.2    -      -       +      -
    137P  LEU*     5.0    13.7    -      -       +      -
    140P  MET*     4.0    14.1    -      -       +      -
    301P  PHE*     3.2    35.7    -      -       +      -
    336P  MET      3.8     8.5    -      -       -      +
    337P  PHE*     3.1    13.4    +      -       +      +
    338P  GLY      2.9     0.6    -      -       -      -
    339P  ALA*     1.3    77.4    -      -       -      +
    341P  LEU*     1.3    68.5    +      -       -      +
    343P  MET*     2.9    29.0    +      -       +      +
    344P  ALA      3.2     4.2    +      -       -      -
    503P  SMA      3.8    29.2    -      -       -      -
----------------------------------------------------------
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Residues in contact with LEU 341 (chain P). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    337P  PHE      2.8    20.0    +      -       -      +
    338P  GLY*     3.5    10.8    -      -       -      +
    340P  ILE*     1.3    75.4    -      -       -      +
    342P  VAL*     1.3    66.2    +      -       +      +
    344P  ALA*     2.9    20.4    +      -       +      +
    345P  LEU*     3.1    36.2    +      -       +      +
----------------------------------------------------------
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Residues in contact with VAL 342 (chain P). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    338P  GLY*     2.8    22.2    +      -       -      +
    339P  ALA*     3.2    20.0    -      -       -      +
    341P  LEU*     1.3    73.4    -      -       +      +
    343P  MET*     1.3    66.6    +      -       -      +
    345P  LEU*     2.8    34.1    +      -       +      +
    346P  VAL*     3.0    10.2    +      -       -      -
    349P  LEU*     4.7     3.8    -      -       +      +
    400P  TRP*     4.1     6.3    -      -       +      +
    401P  PHE*     4.1    20.4    -      -       +      -
    404P  PHE*     3.9    35.9    -      -       +      -
    405P  LEU*     4.3    22.0    -      -       +      -
----------------------------------------------------------
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Residues in contact with MET 343 (chain P). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    109P  TYR*     6.5     0.2    -      -       +      -
    112P  ILE*     4.3    24.7    -      -       +      -
    116P  LEU*     4.9     5.6    -      -       +      -
    129P  TRP*     3.2    17.5    +      -       +      -
    133P  MET*     4.0    22.0    -      -       +      -
    136P  TYR*     4.4    19.3    -      -       +      -
    301P  PHE*     4.7    10.1    -      -       +      -
    339P  ALA      4.1     6.1    -      -       -      +
    340P  ILE*     2.9    23.5    +      -       +      +
    342P  VAL*     1.3    81.1    -      -       -      +
    344P  ALA*     1.3    55.9    -      -       -      +
    346P  VAL*     2.9    26.3    -      -       -      +
    400P  TRP*     4.2    20.9    -      -       +      -
    404P  PHE*     3.9    25.8    -      -       +      -
----------------------------------------------------------
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Residues in contact with ALA 344 (chain P). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    129P  TRP*     3.6    13.5    +      -       -      +
    130P  ILE*     5.2     3.1    -      -       +      +
    133P  MET*     3.9    29.8    -      -       +      +
    340P  ILE      3.2     3.2    +      -       -      +
    341P  LEU*     2.9    22.3    +      -       +      +
    343P  MET*     1.3    78.4    -      -       -      +
    345P  LEU*     1.3    60.8    +      -       +      +
    346P  VAL      3.2     0.7    -      -       -      -
    347P  PRO*     3.1    16.1    -      -       -      +
    348P  TRP*     3.6     8.8    -      -       -      -
----------------------------------------------------------
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Residues in contact with LEU 345 (chain P). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    341P  LEU*     3.3    42.4    -      -       +      +
    342P  VAL*     2.8    13.3    +      -       +      +
    344P  ALA*     1.3    78.2    -      -       +      +
    346P  VAL*     1.3    51.8    +      -       -      +
    347P  PRO*     3.0     6.3    -      -       -      -
    348P  TRP*     2.7    48.0    +      -       +      +
    349P  LEU*     3.2    23.3    +      -       +      -
    405P  LEU*     6.5     0.9    -      -       +      -
----------------------------------------------------------
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Residues in contact with VAL 346 (chain P). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    116P  LEU*     4.1     5.8    -      -       +      -
    121P  TYR*     3.7    29.1    -      -       +      -
    129P  TRP*     3.4    21.3    -      -       +      +
    342P  VAL      3.0     6.0    +      -       -      -
    343P  MET      2.9    26.0    -      -       -      +
    345P  LEU*     1.3    77.4    -      -       -      +
    347P  PRO*     1.3    73.1    -      -       +      +
    348P  TRP      3.0     1.5    +      -       -      -
    349P  LEU*     4.2     8.3    -      -       -      +
    350P  ASP*     3.1    20.8    +      -       -      +
    404P  PHE*     4.0    23.8    -      -       +      -
    408P  LEU*     4.1    16.6    -      -       +      -
----------------------------------------------------------
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Residues in contact with PRO 347 (chain P). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    121P  TYR*     3.7    32.8    -      -       +      +
    122P  LYS*     5.2     5.8    -      -       -      +
    123P  ALA      5.8     0.2    +      -       -      -
    126P  GLU*     4.2    15.6    -      -       +      +
    129P  TRP*     3.7    22.2    -      -       +      -
    344P  ALA      3.1    10.5    -      -       -      +
    345P  LEU      3.0     7.4    -      -       -      +
    346P  VAL*     1.3    99.5    -      -       +      +
    348P  TRP*     1.3    80.4    +      -       +      +
    350P  ASP*     3.9    11.1    -      -       -      +
----------------------------------------------------------
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Residues in contact with TRP 348 (chain P). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     18M  TRP*     4.8    12.5    -      +       -      -
    126P  GLU*     4.4    22.2    +      -       +      +
    130P  ILE*     3.8    29.8    -      -       +      -
    344P  ALA      3.6    18.6    -      -       -      -
    345P  LEU*     2.7    46.1    +      -       +      +
    347P  PRO*     1.3    89.6    -      -       +      +
    349P  LEU*     1.3    69.1    +      -       +      +
    350P  ASP      3.3     4.5    -      -       -      +
    351P  THR*     4.7     8.0    -      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 349 (chain P). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    342P  VAL*     4.7     9.4    -      -       +      +
    345P  LEU*     3.2    27.4    +      -       +      +
    346P  VAL*     3.3     5.8    +      -       -      +
    348P  TRP*     1.3    85.1    -      -       +      +
    350P  ASP*     1.3    61.2    +      -       -      +
    351P  THR*     3.2     9.2    +      -       -      +
    404P  PHE*     2.8    43.7    -      -       +      +
    405P  LEU*     3.5    23.6    -      -       +      -
    408P  LEU*     4.5     3.8    -      -       +      -
    409P  PRO*     3.2    32.2    -      -       +      +
----------------------------------------------------------
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Residues in contact with ASP 350 (chain P). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    121P  TYR*     2.9    29.4    +      -       +      +
    122P  LYS*     3.1    22.8    -      -       +      +
    346P  VAL      3.1    17.5    +      -       -      +
    347P  PRO      3.9    11.4    -      -       -      +
    348P  TRP      4.5     1.1    -      -       -      -
    349P  LEU*     1.3    77.3    -      -       -      +
    351P  THR*     1.3    59.1    +      -       -      +
    352P  SER*     3.0    29.5    +      -       -      +
    360P  ARG*     3.1    13.1    +      -       -      -
    408P  LEU*     3.6    26.7    -      -       +      +
----------------------------------------------------------
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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