Contacts of the helix formed by residues 201 - 223 (chain A) in PDB entry 4RWN


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 PRO 201 (chain A).
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    199A  ASN      3.7     2.2    -      -       -      +
    200A  ARG*     1.3    94.1    -      -       +      +
    202A  THR*     1.3    66.2    +      -       -      +
    203A  LYS      4.5     1.6    -      -       -      +
    204A  LEU*     3.1    25.2    +      -       +      +
    205A  LYS*     3.3     9.9    +      -       -      +
    240A  TRP*     3.6    37.0    -      -       +      +
    246A  LYS      4.8     0.7    -      -       -      +
    247A  THR*     4.2    33.9    -      -       +      -
    249A  PHE*     5.7     0.2    -      -       +      -
     14C    A      4.8     2.9    -      -       -      +
----------------------------------------------------------
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Residues in contact with THR 202 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    200A  ARG      3.5     3.2    +      -       -      -
    201A  PRO*     1.3    71.8    -      -       -      +
    203A  LYS*     1.3    62.0    +      -       -      +
    205A  LYS*     3.2    10.4    +      -       -      +
    206A  SER*     3.1    25.2    +      -       -      +
      6B    U      4.0    12.8    -      -       -      +
      7B    U      3.3    24.8    +      -       -      +
     14C    A      2.8    43.4    +      -       +      -
     15C    A      3.8    27.4    -      -       -      +
----------------------------------------------------------
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Residues in contact with LYS 203 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     12A  ASP*     3.8    15.7    +      -       -      +
    201A  PRO*     3.2     1.6    -      -       -      +
    202A  THR*     1.3    76.4    -      -       -      +
    204A  LEU*     1.3    66.7    +      -       -      +
    206A  SER*     3.2     9.6    +      -       -      -
    207A  LEU*     3.0    18.9    +      -       -      +
    247A  THR      3.6    20.6    +      -       -      +
    248A  ASP*     3.3    11.3    +      -       -      +
    249A  PHE*     2.5    49.6    +      -       +      +
    250A  SER*     4.7     0.4    -      -       -      +
    251A  THR*     3.3    24.4    +      -       -      +
     15C    A      3.6    30.1    +      -       -      +
     16C    A      3.0    26.8    +      -       -      -
----------------------------------------------------------
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Residues in contact with LEU 204 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    200A  ARG*     3.8    31.2    -      -       +      +
    201A  PRO*     3.1    20.3    +      -       +      +
    203A  LYS*     1.3    77.9    -      -       -      +
    205A  LYS*     1.3    58.1    +      -       -      +
    207A  LEU*     3.2     6.7    +      -       +      +
    208A  ILE*     2.9    39.1    +      -       +      +
    236A  THR*     4.1    22.7    -      -       +      +
    237A  VAL*     4.7    12.3    -      -       +      -
    240A  TRP*     3.6    53.2    -      -       +      -
    249A  PHE*     3.7    13.6    -      -       +      -
----------------------------------------------------------
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Residues in contact with LYS 205 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     65A  LYS      2.9    19.9    +      -       -      +
     66A  GLY      3.4    18.8    -      -       -      +
     67A  THR*     4.0    14.1    -      -       +      +
    197A  LEU*     3.3    22.0    -      -       +      +
    198A  ARG      2.7    24.5    +      -       -      -
    200A  ARG*     3.7    16.6    -      -       +      +
    201A  PRO      3.3     9.6    +      -       -      +
    202A  THR*     3.2     9.2    +      -       -      +
    204A  LEU*     1.3    76.5    -      -       -      +
    206A  SER*     1.3    57.0    +      -       -      +
    208A  ILE*     3.3    13.7    +      -       +      +
    209A  ARG*     2.9    38.2    +      -       -      +
      7B    U      2.9    29.6    +      -       -      +
      8B    G      3.2     8.9    +      -       -      -
----------------------------------------------------------
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Residues in contact with SER 206 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     12A  ASP*     5.6     2.0    -      -       -      -
     15A  ILE*     3.7    30.9    -      -       -      +
     20A  LEU*     4.0    17.0    -      -       -      +
    202A  THR*     3.1    19.2    +      -       -      +
    203A  LYS*     3.2    17.5    +      -       -      -
    205A  LYS*     1.3    75.6    -      -       -      +
    207A  LEU*     1.3    60.7    +      -       -      +
    209A  ARG*     3.2    13.9    +      -       -      +
    210A  LEU      3.0    22.3    +      -       -      -
    251A  THR*     5.9     0.4    -      -       -      -
     15C    A      5.0     2.9    +      -       -      -
----------------------------------------------------------
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Residues in contact with LEU 207 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     15A  ILE*     4.8     2.2    -      -       -      +
    203A  LYS      3.0    13.4    +      -       -      +
    204A  LEU*     3.5    13.2    -      -       +      +
    206A  SER*     1.3    72.9    -      -       -      +
    208A  ILE*     1.3    65.9    +      -       -      +
    210A  LEU*     3.1     8.7    +      -       +      +
    211A  VAL*     2.9    29.8    +      -       +      +
    236A  THR*     3.7    24.0    -      -       +      +
    249A  PHE*     4.1    18.8    -      -       +      -
    251A  THR*     3.8    20.4    +      -       +      +
    254A  GLY*     3.9    22.7    -      -       -      +
    255A  PHE*     3.7    30.1    -      -       +      +
    258A  VAL*     5.0     0.7    -      -       +      -
    343A  TRP*     4.2     9.9    -      -       +      -
----------------------------------------------------------
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Residues in contact with ILE 208 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     67A  THR*     4.4     9.6    -      -       +      -
    197A  LEU*     3.6    31.4    -      -       +      -
    204A  LEU*     2.9    26.4    +      -       +      +
    205A  LYS*     3.5    15.5    -      -       +      +
    206A  SER      3.2     0.2    -      -       -      -
    207A  LEU*     1.3    76.9    -      -       -      +
    209A  ARG*     1.3    56.8    +      -       -      +
    211A  VAL*     3.2     5.3    +      -       +      +
    212A  LYS*     2.9    42.3    +      -       +      +
    233A  GLU*     3.6    33.2    -      -       +      +
    236A  THR*     3.8    22.7    -      -       +      -
    237A  VAL*     4.3    12.8    -      -       +      -
----------------------------------------------------------
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Residues in contact with ARG 209 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     15A  ILE*     5.0     0.9    -      -       +      -
     19A  LEU*     3.9    19.3    -      -       +      -
     20A  LEU*     3.3    30.4    -      -       -      +
     21A  PRO*     3.6    12.4    -      -       -      +
     66A  GLY      2.8    24.6    +      -       -      -
     67A  THR*     3.9    10.3    -      -       -      +
     68A  THR*     2.5    56.9    +      -       -      +
     69A  LEU*     3.6    16.8    -      -       +      +
    202A  THR      5.8     0.2    +      -       -      -
    205A  LYS*     2.9    26.8    +      -       -      +
    206A  SER*     3.2     9.9    +      -       -      +
    208A  ILE*     1.3    75.9    -      -       -      +
    210A  LEU*     1.3    55.8    +      -       -      +
    212A  LYS*     3.4     6.2    +      -       -      +
    213A  HIS*     2.9    28.4    +      -       -      +
      6B    U      4.0     4.8    +      -       -      -
      7B    U      3.3    25.1    -      -       -      -
----------------------------------------------------------
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Residues in contact with LEU 210 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
      3A  LEU*     3.8    32.3    -      -       +      +
     11A  LEU*     4.2    13.0    -      -       +      -
     14A  PHE*     4.4     4.3    -      -       +      -
     15A  ILE*     4.2    13.0    -      -       +      -
     19A  LEU*     3.9    18.1    -      -       +      +
    206A  SER      3.0    13.3    +      -       -      +
    207A  LEU*     3.1    10.7    +      -       +      +
    209A  ARG*     1.3    77.6    -      -       -      +
    211A  VAL*     1.3    58.1    +      -       -      +
    213A  HIS*     3.1     4.2    +      -       -      +
    214A  TRP*     2.9    27.4    +      -       -      +
    251A  THR*     3.9    26.0    -      -       +      -
    255A  PHE*     3.9    35.2    -      -       +      -
----------------------------------------------------------
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Residues in contact with VAL 211 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    207A  LEU*     2.9    23.9    +      -       +      +
    208A  ILE*     3.7     4.3    -      -       -      +
    210A  LEU*     1.3    75.1    -      -       -      +
    212A  LYS*     1.3    59.3    +      -       +      +
    214A  TRP*     3.2    18.5    +      -       +      +
    215A  TYR*     2.8    27.9    +      -       -      +
    232A  LEU*     3.9    27.1    -      -       +      +
    233A  GLU*     5.9     0.7    -      -       -      -
    236A  THR*     3.5    27.4    -      -       +      +
    255A  PHE*     4.3    16.2    -      -       +      -
    258A  VAL*     4.2    26.5    -      -       +      -
----------------------------------------------------------
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Residues in contact with LYS 212 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     62A  SER*     3.4     5.7    -      -       -      -
     67A  THR*     2.8    27.1    +      -       -      +
     68A  THR*     4.4     0.2    -      -       -      +
     69A  LEU*     4.3    15.1    -      -       +      +
     73A  SER*     4.4     1.0    +      -       -      -
    208A  ILE*     2.9    38.8    +      -       +      +
    209A  ARG*     3.6     5.6    -      -       -      +
    211A  VAL*     1.3    78.9    -      -       +      +
    213A  HIS*     1.3    56.9    +      -       -      +
    215A  TYR*     3.4     7.6    +      -       -      +
    216A  GLN*     3.0    32.9    +      -       -      +
    229A  GLN*     3.6    28.6    -      -       +      +
    232A  LEU*     6.3     1.1    -      -       +      -
    233A  GLU*     4.5    14.1    +      -       +      +
    401A  APC      2.9    43.1    +      -       -      -
----------------------------------------------------------
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Residues in contact with HIS 213 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
      3A  LEU*     3.6    29.2    +      -       +      +
     14A  PHE*     3.7    25.5    -      +       -      -
     18A  HIS*     6.3     0.7    -      -       +      -
     19A  LEU*     3.9    19.3    -      -       +      +
     69A  LEU*     4.2     6.2    -      -       +      +
     72A  ARG*     2.9    37.3    +      -       -      +
    209A  ARG      2.9    14.2    +      -       -      +
    210A  LEU*     3.5     7.0    -      -       -      +
    212A  LYS*     1.3    73.0    -      -       -      +
    214A  TRP*     1.3    65.2    +      -       -      +
    216A  GLN*     3.3     4.0    +      -       -      +
    217A  THR*     2.8    42.3    +      -       -      -
----------------------------------------------------------
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Residues in contact with TRP 214 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
      3A  LEU*     4.5     8.5    -      -       +      -
    210A  LEU      2.9    13.8    +      -       -      +
    211A  VAL*     3.2    20.4    +      -       +      +
    213A  HIS*     1.3    77.1    -      -       -      +
    215A  TYR*     1.3    72.8    +      -       +      +
    217A  THR*     3.1     7.6    +      -       -      -
    218A  CYS*     3.0    38.1    +      -       -      -
    232A  LEU*     4.0    24.5    -      -       +      -
    255A  PHE*     4.0    20.2    -      +       +      -
    258A  VAL*     5.4     2.2    -      -       +      -
    259A  LEU*     3.5    27.6    -      -       +      -
    262A  VAL*     4.4     9.2    -      -       +      -
    319A  LEU*     3.7    30.5    -      -       +      -
    323A  ALA*     3.9    17.7    -      -       +      -
    326A  TRP*     3.4    55.0    -      +       -      +
----------------------------------------------------------
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Residues in contact with TYR 215 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    211A  VAL      2.8    20.4    +      -       -      +
    212A  LYS*     3.5     7.0    -      -       -      +
    213A  HIS      3.3     0.2    -      -       -      -
    214A  TRP*     1.3    83.4    -      -       +      +
    216A  GLN*     1.3    68.6    +      -       -      +
    218A  CYS*     3.1     9.0    +      -       -      +
    219A  LYS*     3.0    42.5    +      -       +      +
    226A  LEU*     3.9    29.1    +      -       +      +
    227A  PRO*     2.6    32.3    +      -       +      -
    228A  PRO*     4.2     0.9    -      -       -      +
    229A  GLN*     3.5    47.5    +      -       +      -
    232A  LEU*     4.1    25.8    -      -       +      -
    319A  LEU*     4.6     6.3    -      -       +      -
----------------------------------------------------------
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Residues in contact with GLN 216 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     69A  LEU*     4.9     6.1    -      -       +      -
     72A  ARG*     4.4    20.2    -      -       -      +
    212A  LYS      3.0    22.7    +      -       -      +
    213A  HIS*     3.7     4.9    -      -       +      +
    214A  TRP      3.3     0.2    -      -       -      -
    215A  TYR*     1.3    86.9    -      -       -      +
    217A  THR*     1.3    61.1    +      -       -      +
    219A  LYS*     3.1    42.5    +      -       -      +
    220A  LYS*     3.5     9.8    +      -       -      +
    229A  GLN*     2.9    26.0    +      -       -      +
    401A  APC      4.7     4.4    +      -       -      -
----------------------------------------------------------
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Residues in contact with THR 217 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
      3A  LEU*     5.8     0.2    -      -       -      +
      4A  ARG*     5.2    11.2    -      -       -      +
    213A  HIS*     2.8    34.7    +      -       -      -
    214A  TRP*     3.1    10.6    +      -       -      -
    216A  GLN*     1.3    74.7    -      -       -      +
    218A  CYS*     1.3    63.9    +      -       -      +
    220A  LYS*     3.1    40.3    +      -       +      +
    221A  THR*     4.0     3.6    +      -       -      -
    326A  TRP*     4.0    27.0    -      -       +      -
----------------------------------------------------------
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Residues in contact with CYS 218 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    214A  TRP*     3.0    51.3    +      -       -      -
    215A  TYR*     3.1     8.9    +      -       -      +
    217A  THR*     1.3    76.7    -      -       -      +
    219A  LYS*     1.3    61.8    +      -       -      +
    221A  THR*     3.1     5.9    +      -       -      +
    222A  HIS*     3.1    27.5    +      -       +      +
    226A  LEU*     3.9    14.1    -      -       +      -
    319A  LEU*     4.4     5.8    -      -       +      -
    322A  GLU*     3.6    33.4    -      -       +      -
    326A  TRP*     4.5     6.5    -      -       -      -
----------------------------------------------------------
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Residues in contact with LYS 219 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    215A  TYR*     3.0    26.7    +      -       +      +
    216A  GLN*     3.2    40.8    +      -       -      +
    217A  THR      3.1     0.4    -      -       -      -
    218A  CYS*     1.3    73.5    -      -       -      +
    220A  LYS*     1.3    60.5    +      -       -      +
    223A  GLY*     3.0    47.7    +      -       -      +
    224A  ASN*     3.5    35.7    +      -       -      +
    226A  LEU*     3.8    11.0    -      -       +      +
----------------------------------------------------------
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Residues in contact with LYS 220 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
      2A  GLU*     5.3     6.7    +      -       -      -
    216A  GLN      4.1     7.4    -      -       -      +
    217A  THR*     3.1    30.1    +      -       +      +
    218A  CYS      3.1     0.2    -      -       -      -
    219A  LYS*     1.3    81.4    -      -       -      +
    221A  THR*     1.3    62.5    +      -       -      +
    223A  GLY*     4.5     1.0    +      -       -      -
----------------------------------------------------------
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Residues in contact with THR 221 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    217A  THR      4.7     3.8    +      -       -      -
    218A  CYS*     3.1     5.2    +      -       -      -
    220A  LYS*     1.3    82.7    -      -       -      +
    222A  HIS*     1.3    88.3    +      -       +      +
    223A  GLY      3.4     2.0    +      -       -      -
    225A  LYS*     5.6     0.3    +      -       -      -
    318A  ARG*     5.2     2.5    +      -       -      +
    322A  GLU*     4.2    10.6    +      -       -      +
----------------------------------------------------------
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Residues in contact with HIS 222 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    218A  CYS      3.1    13.9    +      -       -      +
    221A  THR*     1.3    92.4    -      -       +      +
    223A  GLY*     1.3    64.8    +      -       -      +
    224A  ASN      3.3     0.2    +      -       -      -
    225A  LYS*     3.1    31.0    +      -       -      +
    226A  LEU*     3.8    25.8    -      -       +      -
    318A  ARG*     3.0    57.1    +      -       +      +
    321A  GLN*     4.2    13.0    -      -       -      -
    322A  GLU*     2.6    42.0    +      -       +      +
----------------------------------------------------------
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Residues in contact with GLY 223 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    219A  LYS*     3.0    41.8    +      -       -      +
    220A  LYS      4.5     1.2    +      -       -      -
    221A  THR      3.4     3.2    +      -       -      -
    222A  HIS*     1.3    77.2    -      -       -      +
    224A  ASN*     1.3    62.3    +      -       -      -
    225A  LYS*     3.6     4.9    +      -       -      -
    226A  LEU*     4.4     4.3    -      -       -      +
----------------------------------------------------------
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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