Contacts of the helix formed by residues 133 - 157 (chain F) in PDB entry 1O9R


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 133 (chain F).
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     10F  LEU*     3.4    30.5    -      -       +      +
     18F  VAL*     3.6    18.9    -      -       +      +
     72F  ARG*     3.0    23.4    +      -       -      -
     76F  LEU*     3.7     2.1    -      -       -      +
    128F  SER      3.0    18.3    +      -       -      +
    129F  ASP      3.9     0.8    +      -       -      -
    131F  ALA      4.9     0.7    -      -       -      -
    132F  GLY*     1.4    81.8    -      -       -      +
    134F  PRO*     1.3    63.1    -      -       -      +
    135F  THR*     3.4     4.0    +      -       -      -
    136F  THR*     2.5    35.2    +      -       -      -
    137F  ALA*     3.0    18.2    +      -       -      +
----------------------------------------------------------
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Residues in contact with PRO 134 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    129F  ASP*     3.7    23.3    -      -       -      +
    132F  GLY*     3.3    10.5    -      -       -      +
    133F  ASP*     1.3    89.8    -      -       -      +
    135F  THR*     1.3    60.2    +      -       -      +
    137F  ALA*     3.6     4.9    -      -       +      +
    138F  ASP*     2.9    28.4    +      -       -      +
----------------------------------------------------------
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Residues in contact with THR 135 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     72F  ARG*     3.5    34.1    -      -       -      +
    133F  ASP*     3.2     2.7    +      -       -      -
    134F  PRO*     1.3    79.7    -      -       -      +
    136F  THR*     1.3    62.2    +      -       -      +
    138F  ASP*     3.2    15.0    +      -       -      +
    139F  ILE*     3.3    18.9    +      -       +      +
----------------------------------------------------------
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Residues in contact with THR 136 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     18F  VAL*     3.4    24.3    -      -       +      +
     22F  LEU*     3.8    13.0    -      -       +      -
     72F  ARG*     2.8    25.6    +      -       +      +
     76F  LEU*     4.1     0.3    -      -       -      +
    128F  SER*     3.6     4.3    -      -       -      +
    133F  ASP*     2.5    35.6    +      -       -      -
    135F  THR*     1.3    76.9    -      -       -      +
    137F  ALA*     1.3    62.1    +      -       -      +
    139F  ILE*     3.0    17.0    +      -       +      +
    140F  PHE*     3.1    33.4    +      -       +      -
----------------------------------------------------------
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Residues in contact with ALA 137 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    125F  ILE*     3.6    32.0    -      -       +      +
    128F  SER*     3.8    10.2    -      -       -      -
    129F  ASP*     4.0    11.7    -      -       +      +
    133F  ASP      3.0    14.3    +      -       -      +
    134F  PRO*     3.6    13.2    -      -       +      +
    136F  THR*     1.3    76.8    -      -       -      +
    138F  ASP*     1.3    58.6    +      -       -      +
    140F  PHE*     3.3     5.1    +      -       -      +
    141F  THR*     2.8    31.7    +      -       -      +
----------------------------------------------------------
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Residues in contact with ASP 138 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    134F  PRO      2.9    14.0    +      -       -      +
    135F  THR*     3.4    11.7    -      -       -      +
    136F  THR      3.2     0.2    -      -       -      -
    137F  ALA*     1.3    75.6    -      -       -      +
    139F  ILE*     1.3    67.3    +      -       +      +
    141F  THR*     3.6    11.2    -      -       -      +
    142F  ALA*     2.9    26.3    +      -       -      +
----------------------------------------------------------
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Residues in contact with ILE 139 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     22F  LEU*     5.1     3.6    -      -       +      -
     65F  HIS*     4.7     2.9    +      -       -      +
     68F  THR*     3.6    35.9    -      -       +      +
     69F  ILE*     4.1    27.1    -      -       +      +
     72F  ARG*     3.8    39.5    -      -       +      +
     75F  GLN*     5.4     2.5    -      -       -      +
    135F  THR*     3.3    16.5    +      -       +      +
    136F  THR*     3.0     9.2    +      -       +      +
    138F  ASP*     1.3    78.3    -      -       +      +
    140F  PHE*     1.4    63.9    +      -       +      +
    142F  ALA*     3.4     6.8    +      -       -      +
    143F  ALA*     3.1    21.5    +      -       +      +
----------------------------------------------------------
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Residues in contact with PHE 140 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     21F  ILE*     3.8    14.4    -      -       +      -
     22F  LEU*     3.5    24.0    -      -       +      -
     25F  SER*     3.7    25.6    -      -       -      -
     69F  ILE*     4.0    17.7    -      -       +      -
    121F  ILE*     3.3    24.7    -      -       +      +
    124F  ALA*     3.7    26.0    -      -       +      -
    125F  ILE*     3.7    20.4    -      -       +      +
    128F  SER*     3.4    27.1    -      -       -      -
    136F  THR*     3.1    32.9    +      -       +      -
    137F  ALA      3.7     3.4    -      -       -      +
    139F  ILE*     1.4    77.3    -      -       +      +
    141F  THR*     1.3    56.4    +      -       -      +
    143F  ALA*     3.3     2.9    +      -       -      -
    144F  SER*     2.8    25.6    +      -       -      -
----------------------------------------------------------
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Residues in contact with THR 141 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    125F  ILE*     3.5    29.7    -      -       +      +
    137F  ALA      2.8    21.8    +      -       -      -
    138F  ASP*     3.1    13.3    +      -       -      +
    140F  PHE*     1.3    72.4    -      -       -      +
    142F  ALA*     1.3    67.9    +      -       -      +
    144F  SER*     3.2     2.5    +      -       -      -
    145F  ARG*     2.9    33.7    +      -       +      +
----------------------------------------------------------
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Residues in contact with ALA 142 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     65F  HIS*     3.5    18.3    +      -       +      -
    138F  ASP*     2.9    18.6    +      -       -      +
    139F  ILE*     3.7     7.2    -      -       -      +
    141F  THR*     1.3    78.7    -      -       -      +
    143F  ALA*     1.4    60.0    +      -       -      +
    145F  ARG*     3.3    18.6    +      -       -      +
    146F  ASP*     3.4    11.1    +      -       -      +
----------------------------------------------------------
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Residues in contact with ALA 143 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     65F  HIS*     3.4    36.3    +      -       +      +
     69F  ILE*     5.0    10.8    -      -       +      -
    121F  ILE*     4.1    11.0    -      -       +      -
    139F  ILE*     3.1    13.4    +      -       +      +
    140F  PHE*     3.7     9.4    -      -       -      +
    141F  THR      3.2     0.2    -      -       -      -
    142F  ALA*     1.4    77.9    -      -       -      +
    144F  SER*     1.3    57.4    +      -       -      +
    146F  ASP*     3.2     3.3    +      -       -      +
    147F  LEU*     2.8    39.4    +      -       +      +
----------------------------------------------------------
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Residues in contact with SER 144 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    118F  ALA      5.1     1.5    +      -       -      -
    121F  ILE*     3.6    15.8    -      -       -      +
    122F  ARG*     4.2    13.6    +      -       -      +
    125F  ILE*     3.9    18.8    -      -       -      +
    140F  PHE      2.8    21.7    +      -       -      -
    141F  THR*     3.4     6.3    -      -       -      -
    143F  ALA*     1.3    68.5    -      -       -      +
    145F  ARG*     1.4    68.8    +      -       -      +
    147F  LEU*     4.4     4.3    -      -       -      -
    148F  ASP*     2.8    39.5    +      -       -      +
----------------------------------------------------------
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Residues in contact with ARG 145 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    141F  THR*     2.9    27.6    +      -       +      +
    142F  ALA*     3.6    11.2    -      -       -      +
    143F  ALA      3.2     0.2    -      -       -      -
    144F  SER*     1.4    78.0    -      -       -      +
    146F  ASP*     1.3    66.8    +      -       -      +
    148F  ASP*     3.6     3.6    +      -       -      +
    149F  LYS*     3.1    24.3    +      -       -      +
----------------------------------------------------------
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Residues in contact with ASP 146 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     61F  GLN*     3.8    32.7    +      -       +      +
     65F  HIS*     2.8    38.0    +      -       +      +
    142F  ALA      3.4     4.1    +      -       -      +
    143F  ALA      3.2     3.6    +      -       -      +
    145F  ARG*     1.3    80.8    -      -       -      +
    147F  LEU*     1.3    60.0    +      -       +      +
    149F  LYS*     3.8     8.5    -      -       -      +
    150F  SER*     2.9    35.0    +      -       -      -
----------------------------------------------------------
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Residues in contact with LEU 147 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     29F  VAL*     5.5     2.5    -      -       +      -
     32F  LEU*     4.1     9.0    -      -       +      -
     62F  LEU*     3.9    27.8    -      -       +      -
     65F  HIS*     6.0     2.7    -      -       +      -
    114F  TYR*     4.3    14.9    -      -       +      +
    117F  VAL*     3.9    23.6    -      -       +      +
    118F  ALA*     3.9    16.8    -      -       +      +
    121F  ILE*     3.6    37.5    -      -       +      -
    143F  ALA*     2.8    28.8    +      -       +      +
    144F  SER*     4.0     3.1    -      -       -      +
    146F  ASP*     1.3    71.9    -      -       +      +
    148F  ASP*     1.4    59.2    +      -       -      +
    150F  SER*     3.3     3.5    +      -       -      -
    151F  LEU*     2.8    31.0    +      -       -      +
----------------------------------------------------------
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Residues in contact with ASP 148 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    118F  ALA*     3.6    11.4    -      -       -      +
    122F  ARG*     2.9    44.1    +      -       -      -
    144F  SER*     2.8    28.6    +      -       -      +
    145F  ARG*     4.2     3.1    -      -       -      +
    147F  LEU*     1.4    72.6    -      -       -      +
    149F  LYS*     1.4    59.0    +      -       -      +
    151F  LEU*     3.5     9.2    +      -       -      +
    152F  TRP*     3.0    27.2    +      -       -      +
----------------------------------------------------------
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Residues in contact with LYS 149 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     52D  HIS*     5.5     2.3    -      -       -      -
    145F  ARG      3.1    18.8    +      -       -      +
    146F  ASP*     3.9     9.2    -      -       -      +
    148F  ASP*     1.4    76.2    -      -       -      +
    150F  SER*     1.3    61.2    +      -       -      +
    152F  TRP*     3.3    26.8    +      -       +      +
    153F  PHE*     2.8    62.8    +      -       +      -
----------------------------------------------------------
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Residues in contact with SER 150 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     58F  PHE*     3.5    37.5    -      -       -      +
     61F  GLN*     3.5    11.4    +      -       -      -
    114F  TYR*     3.9    21.4    -      -       -      -
    146F  ASP      2.9    20.3    +      -       -      -
    147F  LEU*     3.7     5.3    -      -       -      -
    149F  LYS*     1.3    74.3    -      -       -      +
    151F  LEU*     1.3    66.1    +      -       -      +
    153F  PHE*     3.2     3.0    +      -       -      +
    154F  LEU*     3.0    29.6    +      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 151 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    111F  ILE*     3.9    15.9    -      -       +      +
    114F  TYR*     4.2    10.9    -      -       +      -
    115F  GLY*     3.8    34.1    -      -       -      +
    118F  ALA*     4.4    11.9    -      -       +      -
    119F  ASN*     5.7     2.5    -      -       -      +
    122F  ARG*     5.4     3.4    -      -       -      +
    147F  LEU      2.8    18.5    +      -       -      +
    148F  ASP*     3.7     9.9    -      -       -      +
    150F  SER*     1.3    76.3    -      -       -      +
    152F  TRP*     1.3    58.4    +      -       -      +
    154F  LEU*     3.2     8.6    +      -       -      +
    155F  GLU*     2.8    63.8    +      -       +      +
----------------------------------------------------------
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Residues in contact with TRP 152 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     41D  TRP*     3.6    33.0    +      +       -      -
     43D  LEU      5.3     0.2    +      -       -      -
     44D  LYS*     4.7    10.6    -      -       -      +
     48D  PHE*     3.9    18.3    -      +       -      -
     52D  HIS*     3.9    14.1    -      +       -      -
    148F  ASP      3.0    14.9    +      -       -      +
    149F  LYS*     3.5    25.6    -      -       +      +
    151F  LEU*     1.3    77.6    -      -       -      +
    153F  PHE*     1.3    91.0    +      +       -      +
    155F  GLU*     3.2     9.1    +      -       +      -
    156F  ALA*     2.8    39.0    +      -       +      +
    159F  GLN*     5.0     6.3    -      -       -      -
----------------------------------------------------------
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Residues in contact with PHE 153 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     48D  PHE*     3.5    21.4    -      +       +      -
     49D  ILE*     3.6    22.9    -      -       +      -
     52D  HIS*     3.7    27.8    -      +       -      -
     53D  GLU*     5.5     1.3    -      -       -      -
     54F  LEU*     3.9    20.4    -      -       +      -
     58F  PHE*     3.9    17.5    -      +       +      -
    149F  LYS*     2.8    46.1    +      -       +      +
    150F  SER*     3.2     8.0    +      -       -      +
    152F  TRP*     1.3   105.6    -      +       -      +
    154F  LEU*     1.3    61.4    +      -       -      +
    156F  ALA      3.6     3.6    +      -       -      -
    157F  HIS*     2.8    26.8    +      -       -      -
----------------------------------------------------------
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Residues in contact with LEU 154 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     51F  VAL*     5.9     0.9    -      -       +      -
     54F  LEU*     5.3     4.7    -      -       +      -
     55F  LEU*     4.4     6.1    -      -       +      -
     58F  PHE*     3.8    20.4    -      -       +      -
    107F  LEU*     3.7    25.7    -      -       +      +
    110F  LEU*     4.1    27.1    -      -       +      +
    111F  ILE*     3.6    21.3    -      -       +      +
    114F  TYR*     3.6    42.8    -      -       +      -
    150F  SER      3.0    18.7    +      -       -      +
    151F  LEU*     3.6     6.1    -      -       -      +
    153F  PHE*     1.3    74.1    -      -       -      +
    155F  GLU*     1.3    67.0    +      -       -      +
    157F  HIS*     3.2    22.5    +      -       -      +
    158F  VAL*     3.9     2.1    +      -       -      +
----------------------------------------------------------
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Residues in contact with GLU 155 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    111F  ILE*     3.8    33.0    -      -       +      +
    151F  LEU*     2.8    52.1    +      -       +      +
    152F  TRP*     3.9     6.6    -      -       -      +
    154F  LEU*     1.3    71.8    -      -       -      +
    156F  ALA*     1.3    58.6    +      -       -      +
    158F  VAL*     2.9    21.4    +      -       +      +
    159F  GLN*     3.0    40.2    +      -       +      +
----------------------------------------------------------
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Residues in contact with ALA 156 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     43D  LEU      4.3     5.8    -      -       -      +
     44D  LYS*     3.4     7.1    -      -       +      +
     45D  GLY      2.7    32.2    +      -       -      +
     48D  PHE*     3.7    29.6    -      -       +      +
    152F  TRP*     2.8    38.7    +      -       +      +
    153F  PHE      4.0     2.0    -      -       -      +
    154F  LEU      3.2     0.2    -      -       -      -
    155F  GLU*     1.3    72.3    -      -       -      +
    157F  HIS*     1.3    51.9    +      -       -      +
    158F  VAL      3.5     0.2    +      -       -      -
    159F  GLN*     3.3    15.4    +      -       -      +
----------------------------------------------------------
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Residues in contact with HIS 157 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     45D  GLY      3.3    21.9    -      -       -      -
     46D  PRO*     3.3    33.1    +      -       +      +
     47D  GLN      4.7     0.2    -      -       -      -
     48D  PHE*     3.8    12.9    +      +       +      +
     49D  ILE*     3.3    41.8    +      -       +      +
     50F  ALA*     5.8     0.2    -      -       -      +
     51F  VAL*     4.1    19.4    -      -       +      +
     54F  LEU*     4.0    14.8    -      -       +      -
    107F  LEU*     3.8    24.4    -      -       +      +
    153F  PHE      2.8    26.5    +      -       -      -
    154F  LEU*     3.2    12.6    +      -       +      +
    155F  GLU      3.1     1.0    +      -       -      -
    156F  ALA*     1.3    77.2    -      -       -      +
    158F  VAL*     1.3    60.9    +      -       -      +
    160F  GLU      3.7     3.8    -      -       -      +
----------------------------------------------------------
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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