Contacts of the helix formed by residues 279 - 301 (chain A) in PDB entry 4UQJ


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 LYS 279 (chain A).
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     24A  GLN*     3.4    20.9    +      -       -      +
     25A  GLU*     5.0     2.0    -      -       -      +
    229A  ASP*     3.2    18.1    -      -       +      +
    278A  ILE*     1.3    78.4    -      -       -      +
    280A  TYR*     1.3    61.9    +      -       +      +
    281A  THR*     3.8    17.3    -      -       -      +
    282A  SER*     2.9     5.3    +      -       -      +
    283A  ALA*     2.9    23.9    +      -       -      +
----------------------------------------------------------
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Residues in contact with TYR 280 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     99A  PRO      5.4     2.2    -      -       -      -
    114A  ARG*     5.4     4.3    -      -       +      -
    141A  ARG*     4.9    13.5    -      -       -      -
    197A  GLU*     6.1     1.6    -      -       -      -
    198A  ARG*     6.0     6.7    -      -       +      -
    224A  ASN*     4.8    13.6    -      -       +      +
    225A  LEU*     3.7    40.6    -      -       +      +
    226A  GLY*     3.6    17.3    -      -       -      -
    229A  ASP*     2.9    22.8    +      -       +      +
    246A  GLN*     5.9     0.4    -      -       -      +
    247A  ILE*     3.5    24.4    -      -       +      +
    248A  VAL*     4.2    13.7    -      -       +      -
    278A  ILE      3.5     1.2    +      -       -      -
    279A  LYS*     1.3    72.4    -      -       +      +
    281A  THR*     1.3    81.0    +      -       +      +
    283A  ALA*     3.7     0.9    -      -       -      +
    284A  LEU*     3.0    46.1    +      -       +      +
----------------------------------------------------------
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Residues in contact with THR 281 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     25A  GLU*     2.8    30.7    +      -       -      +
     76A  PHE*     5.2     8.3    -      -       +      -
     99A  PRO*     3.9    11.3    -      -       +      +
    100A  SER*     6.5     0.2    -      -       -      -
    279A  LYS*     3.8    10.3    -      -       +      +
    280A  TYR*     1.3   110.8    -      -       +      +
    282A  SER*     1.3    59.1    +      -       -      +
    284A  LEU*     3.5     7.9    +      -       -      +
    285A  THR*     3.0    25.0    +      -       -      -
----------------------------------------------------------
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Residues in contact with SER 282 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     24A  GLN*     3.3    38.8    +      -       -      +
     25A  GLU*     3.3    23.3    +      -       -      +
     28A  ALA*     3.4     8.2    -      -       -      +
    278A  ILE*     3.6    19.5    -      -       -      -
    279A  LYS*     2.9     8.9    +      -       -      +
    281A  THR*     1.3    78.5    +      -       -      +
    283A  ALA*     1.3    63.5    +      -       -      +
    285A  THR*     3.1    18.2    +      -       -      -
    286A  TYR      3.1    10.0    +      -       -      -
----------------------------------------------------------
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Residues in contact with ALA 283 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    247A  ILE*     6.0     0.2    -      -       +      -
    248A  VAL*     3.6    30.7    -      -       +      -
    278A  ILE*     3.6    15.6    -      -       +      +
    279A  LYS      2.9    12.3    +      -       -      +
    280A  TYR      3.7     3.4    -      -       -      +
    282A  SER*     1.3    76.6    -      -       -      +
    284A  LEU*     1.3    58.4    +      -       +      +
    286A  TYR*     3.4     3.8    +      -       -      +
    287A  ASP*     3.1    32.7    +      -       -      +
    341A  LEU*     4.0    24.5    -      -       +      +
    342A  SER*     5.5     0.9    -      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 284 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     99A  PRO*     3.7    27.4    -      -       +      +
    113A  MET*     3.3    29.2    -      -       +      +
    114A  ARG*     3.6    32.1    -      -       +      +
    115A  PRO*     4.8     3.6    -      -       +      -
    225A  LEU*     5.3     0.9    -      -       +      -
    247A  ILE*     5.4     3.6    -      -       +      -
    280A  TYR*     3.0    39.0    +      -       +      +
    281A  THR*     3.8     0.9    -      -       -      +
    283A  ALA*     1.3    74.5    -      -       +      +
    285A  THR*     1.3    55.8    +      -       -      +
    287A  ASP*     3.2     5.5    +      -       +      +
    288A  ALA*     2.8    34.4    +      -       -      +
    342A  SER*     3.5    33.4    -      -       -      +
    353A  ARG*     3.9     1.6    -      -       -      +
----------------------------------------------------------
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Residues in contact with THR 285 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     18A  PHE*     4.4     0.7    -      -       +      -
     25A  GLU*     3.3    27.9    +      -       -      +
     28A  ALA*     4.6     0.4    -      -       -      -
     29A  PHE*     3.6    21.8    -      -       +      -
     74A  PHE*     3.4    27.7    -      -       +      -
     76A  PHE*     3.7     8.7    -      -       -      -
     99A  PRO*     3.7    11.2    -      -       -      +
    281A  THR      3.0    14.9    +      -       -      -
    282A  SER*     3.1    10.8    +      -       -      -
    284A  LEU*     1.3    79.8    -      -       -      +
    286A  TYR*     1.3    61.7    +      -       -      +
    288A  ALA*     3.1    16.6    +      -       -      +
    289A  VAL*     3.3    10.9    +      -       -      +
----------------------------------------------------------
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Residues in contact with TYR 286 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     28A  ALA*     3.9    18.8    +      -       +      +
     31A  VAL*     4.2     7.6    -      -       +      -
     32A  GLY*     3.7    25.4    -      -       -      -
     35A  GLN*     3.3    26.2    -      -       +      +
     36A  PHE*     3.4    30.9    -      +       -      -
    254A  LEU*     5.8     4.4    -      -       +      +
    258A  PHE*     3.4    34.8    -      +       +      -
    282A  SER      3.1     9.0    +      -       -      +
    283A  ALA      3.6     7.2    -      -       -      +
    285A  THR*     1.3    79.4    -      -       -      +
    287A  ASP*     1.3    79.9    +      -       -      +
    288A  ALA      3.3     0.3    +      -       -      -
    289A  VAL*     3.3    15.8    +      -       -      +
    290A  GLN*     3.5     8.7    +      -       -      -
    340A  GLY*     5.8     0.7    -      -       -      -
    341A  LEU*     3.7    25.1    -      -       +      -
----------------------------------------------------------
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Residues in contact with ASP 287 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    113A  MET*     4.3     4.0    -      -       -      -
    283A  ALA      3.1    17.9    +      -       -      +
    284A  LEU*     3.7     7.4    -      -       +      +
    286A  TYR*     1.3    87.4    -      -       -      +
    288A  ALA*     1.3    63.6    +      -       -      +
    290A  GLN*     3.4     9.7    +      -       -      +
    291A  VAL*     3.1    28.3    +      -       -      +
    340A  GLY*     3.3    12.3    -      -       -      -
    341A  LEU*     2.8    21.7    +      -       -      -
    342A  SER*     2.9    38.1    +      -       -      +
    345A  ILE*     3.7    16.0    -      -       +      +
----------------------------------------------------------
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Residues in contact with ALA 288 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     74A  PHE*     3.4    32.8    -      -       +      -
     97A  ILE*     3.9     6.0    -      -       +      +
    113A  MET*     3.7    19.5    -      -       +      -
    284A  LEU      2.8    13.9    +      -       -      +
    285A  THR      3.1    11.4    +      -       -      +
    287A  ASP*     1.3    75.5    -      -       -      +
    289A  VAL*     1.3    65.2    +      -       +      +
    291A  VAL*     3.1     4.7    +      -       -      +
    292A  MET*     3.0    28.7    +      -       -      +
----------------------------------------------------------
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Residues in contact with VAL 289 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     29A  PHE*     3.8    43.1    -      -       +      +
     32A  GLY*     3.4    32.3    -      -       -      +
     33A  MET*     3.8    15.9    -      -       -      +
     36A  PHE*     4.1     4.3    -      -       +      -
     43A  LEU*     4.9     4.6    -      -       +      +
    285A  THR      3.3    13.6    +      -       -      +
    286A  TYR*     3.6     8.3    -      -       -      +
    287A  ASP      3.3     0.2    -      -       -      -
    288A  ALA*     1.3    78.2    -      -       -      +
    290A  GLN*     1.3    56.8    +      -       -      +
    292A  MET*     3.3    10.7    +      -       -      +
    293A  THR*     3.0    38.8    +      -       -      +
----------------------------------------------------------
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Residues in contact with GLN 290 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     36A  PHE*     3.4    49.8    -      -       +      -
    286A  TYR*     3.5     5.0    +      -       -      +
    287A  ASP*     3.4    14.4    +      -       -      +
    288A  ALA      3.2     0.6    -      -       -      -
    289A  VAL*     1.3    78.8    -      -       -      +
    291A  VAL*     1.3    57.6    +      -       -      +
    293A  THR*     3.4     2.8    +      -       -      -
    294A  GLU*     3.0    27.7    +      -       -      +
    338A  VAL*     3.4    35.5    -      -       +      +
    339A  GLU      3.2    26.7    +      -       -      +
    340A  GLY*     4.0     9.7    -      -       -      -
    345A  ILE*     5.3     0.2    -      -       -      +
----------------------------------------------------------
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Residues in contact with VAL 291 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     97A  ILE*     5.8     1.8    -      -       +      -
    111A  ILE*     5.0     3.1    -      -       +      -
    113A  MET*     4.3    14.6    -      -       +      -
    287A  ASP      3.1    16.8    -      -       -      +
    288A  ALA*     3.1     8.2    +      -       -      +
    290A  GLN*     1.3    78.2    -      -       -      +
    292A  MET*     1.3    58.1    +      -       +      +
    294A  GLU      3.5     0.3    +      -       -      -
    295A  ALA*     3.0    27.5    +      -       -      +
    333A  LEU*     4.2    20.0    -      -       +      +
    336A  VAL*     3.5    32.5    -      -       +      +
    338A  VAL*     4.7     3.6    -      -       +      -
    345A  ILE*     4.2    28.3    -      -       +      -
    347A  PHE*     4.2    10.1    -      -       +      -
----------------------------------------------------------
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Residues in contact with MET 292 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     14A  ILE*     3.7    43.3    -      -       +      -
     29A  PHE*     5.4     4.5    -      -       -      -
     43A  LEU*     4.5    12.6    -      -       +      +
     72A  ALA*     4.1    19.5    -      -       +      -
     74A  PHE*     4.1    26.2    -      -       +      -
     97A  ILE*     4.3    26.7    -      -       +      -
    288A  ALA      3.0    20.3    +      -       -      +
    289A  VAL*     3.3     8.5    +      -       -      +
    291A  VAL*     1.3    75.5    -      -       +      +
    293A  THR*     1.3    61.6    +      -       -      +
    295A  ALA*     3.7     1.2    -      -       -      +
    296A  PHE*     3.1    24.9    +      -       -      +
    333A  LEU*     4.0    11.9    -      -       +      -
----------------------------------------------------------
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Residues in contact with THR 293 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     36A  PHE*     3.7    38.3    +      -       +      +
     38A  THR*     5.4     4.3    -      -       +      -
     41A  PHE*     3.5    24.3    -      -       +      -
     43A  LEU*     4.2    14.9    -      -       +      +
    289A  VAL*     3.0    19.5    +      -       -      +
    290A  GLN*     3.7     6.1    -      -       -      -
    292A  MET*     1.3    75.5    -      -       -      +
    294A  GLU*     1.3    61.6    +      -       -      +
    296A  PHE      3.3     1.4    +      -       -      -
    297A  ARG*     3.0    31.0    +      -       +      +
----------------------------------------------------------
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Residues in contact with GLU 294 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    290A  GLN*     3.0    17.6    +      -       +      +
    293A  THR*     1.3    79.2    -      -       -      +
    295A  ALA*     1.3    57.3    +      -       -      +
    297A  ARG*     3.7     7.4    -      -       -      +
    298A  ASN*     3.1    60.3    +      -       -      +
    336A  VAL*     3.9    20.0    -      -       +      -
    337A  GLN      5.1     0.9    -      -       -      +
    338A  VAL*     3.9    27.7    -      -       +      +
----------------------------------------------------------
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Residues in contact with ALA 295 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    291A  VAL      3.0    19.3    +      -       -      +
    292A  MET      3.7     3.4    -      -       -      +
    293A  THR      3.1     0.2    -      -       -      -
    294A  GLU*     1.3    74.8    -      -       -      +
    296A  PHE*     1.3    64.0    +      -       -      +
    297A  ARG      3.1     2.2    +      -       -      -
    298A  ASN*     3.3    12.0    +      -       -      +
    299A  LEU*     3.4    21.3    +      -       -      +
    332A  ALA*     3.9     6.9    -      -       +      +
    333A  LEU*     3.5    35.4    -      -       +      +
    336A  VAL*     3.6    14.8    -      -       +      +
----------------------------------------------------------
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Residues in contact with PHE 296 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     12A  ILE*     3.6    32.5    -      -       +      +
     41A  PHE*     4.1    13.2    -      -       +      -
     43A  LEU*     5.6     1.8    -      -       +      -
    292A  MET      3.1    14.4    +      -       -      +
    293A  THR      4.0     2.9    -      -       -      +
    295A  ALA*     1.3    78.3    -      -       -      +
    297A  ARG*     1.3    59.6    +      -       -      +
    299A  LEU*     3.6    13.7    +      -       +      +
    300A  ARG*     3.5    17.7    +      -       -      +
----------------------------------------------------------
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Residues in contact with ARG 297 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     41A  PHE*     3.7    21.3    -      -       +      -
    293A  THR*     3.0    19.7    +      -       +      +
    294A  GLU*     3.7    13.0    -      -       -      +
    296A  PHE*     1.3    75.3    -      -       -      +
    298A  ASN*     1.3    63.8    +      -       -      +
    299A  LEU      3.1     5.2    -      -       -      -
    300A  ARG*     3.3     4.9    +      -       -      +
    301A  LYS*     3.2    23.9    +      -       -      +
----------------------------------------------------------
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Residues in contact with ASN 298 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    294A  GLU*     3.1    47.9    +      -       -      +
    295A  ALA*     3.3     7.4    +      -       -      +
    297A  ARG*     1.3    78.4    -      -       -      +
    299A  LEU*     1.3    63.2    +      -       +      +
    300A  ARG      3.5     0.2    -      -       -      -
    301A  LYS*     4.2     6.9    -      -       -      +
    302A  GLN*     3.0    25.3    +      -       -      +
    332A  ALA*     5.3     4.9    +      -       +      +
    335A  GLN*     5.4     4.8    +      -       -      +
    336A  VAL*     5.0    10.9    -      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 299 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    295A  ALA      3.4    11.2    +      -       -      +
    296A  PHE*     3.8    15.3    -      -       -      +
    297A  ARG      3.1     0.4    -      -       -      -
    298A  ASN*     1.3    86.1    -      -       +      +
    300A  ARG*     1.3    61.4    +      -       -      +
    301A  LYS      3.4     0.4    -      -       -      -
    302A  GLN*     3.5     2.6    +      -       -      -
    303A  ARG      3.4     2.4    +      -       -      -
    304A  ILE*     3.1    61.5    +      -       +      +
    306A  ILE*     3.9    29.8    -      -       +      -
    328A  GLU*     4.6     5.8    -      -       +      +
    329A  ILE*     4.5    14.8    -      -       +      +
    332A  ALA*     3.4    32.5    -      -       +      -
----------------------------------------------------------
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Residues in contact with ARG 300 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     10A  ASN*     5.8     3.6    -      -       -      +
     41A  PHE*     5.4     8.7    -      -       +      -
    296A  PHE      3.5     9.8    +      -       -      +
    297A  ARG*     3.3    11.0    +      -       -      +
    299A  LEU*     1.3    80.0    -      -       -      +
    301A  LYS*     1.3    59.5    +      -       -      +
    302A  GLN      3.1     0.9    -      -       -      -
    303A  ARG*     3.3    13.0    +      -       -      -
    304A  ILE      5.2     0.7    -      -       -      +
----------------------------------------------------------
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Residues in contact with LYS 301 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    297A  ARG      3.2    13.1    +      -       -      +
    298A  ASN*     4.7     6.3    -      -       -      +
    300A  ARG*     1.3    78.9    -      -       -      +
    302A  GLN*     1.3    58.1    +      -       -      +
    303A  ARG*     3.3     2.4    +      -       -      +
----------------------------------------------------------
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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