Contacts of the helix formed by residues 119 - 143 (chain A) in PDB entry 1Q6X


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 119 (chain A).
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    117A  PHE*     3.3     5.3    -      -       -      +
    118A  GLN*     1.3    85.7    -      -       -      +
    120A  THR*     1.3    63.2    -      -       -      +
    121A  ASN*     3.3    14.2    +      -       -      +
    122A  ASP*     3.0    35.6    +      -       -      +
    123A  GLN*     3.5     6.6    +      -       -      +
    125A  ARG*     4.8     0.7    +      -       -      -
    324A  ARG*     3.3    15.9    -      -       -      +
----------------------------------------------------------
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Residues in contact with THR 120 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    119A  ASP*     1.3    73.3    -      -       -      +
    121A  ASN*     1.3    63.7    +      -       -      +
    123A  GLN*     3.0    14.8    +      -       -      +
    124A  LEU*     2.9    48.0    +      -       +      +
    229A  VAL*     4.6    17.0    -      -       +      -
    324A  ARG*     3.6    26.1    +      -       -      +
----------------------------------------------------------
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Residues in contact with ASN 121 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    119A  ASP*     3.1    14.7    +      -       -      +
    120A  THR*     1.3    83.6    -      -       -      +
    122A  ASP*     1.3    58.4    +      -       -      +
    124A  LEU*     3.4     8.3    +      -       -      +
    125A  ARG*     3.0    56.6    +      -       -      +
    222A  PHE*     3.7    26.6    -      -       +      -
    226A  ARG*     3.8    28.2    +      -       -      +
----------------------------------------------------------
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Residues in contact with ASP 122 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    116A  HIS      4.6     3.1    -      -       -      +
    117A  PHE*     3.9    23.7    -      -       +      -
    118A  GLN*     3.2    27.3    +      -       -      +
    119A  ASP*     3.0    24.7    +      -       -      +
    121A  ASN*     1.3    72.6    -      -       -      +
    123A  GLN*     1.3    66.3    +      -       -      +
    125A  ARG*     3.1    24.4    +      -       -      +
    126A  PHE*     3.0    22.9    +      -       -      +
----------------------------------------------------------
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Residues in contact with GLN 123 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    117A  PHE*     3.6    27.2    -      -       +      -
    119A  ASP      3.5     4.0    +      -       -      +
    120A  THR*     3.0    21.9    +      -       -      +
    122A  ASP*     1.3    79.5    -      -       -      +
    124A  LEU*     1.3    66.8    +      -       +      +
    126A  PHE*     3.3     4.2    +      -       -      +
    127A  ALA*     3.0    25.8    +      -       -      +
    229A  VAL*     5.7     1.2    -      -       -      +
    282A  LEU*     4.0    16.3    -      -       +      +
    283A  ASP      3.8     7.1    +      -       -      -
    322A  VAL*     2.9    36.6    +      -       +      +
    323A  GLY      4.2     0.4    -      -       -      +
    324A  ARG*     3.4    37.4    -      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 124 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    120A  THR*     2.9    32.8    +      -       +      +
    121A  ASN*     4.5     3.1    -      -       -      +
    123A  GLN*     1.3    85.4    -      -       -      +
    125A  ARG*     1.3    59.5    +      -       -      +
    127A  ALA*     3.4     3.4    +      -       -      +
    128A  ALA*     2.8    30.0    +      -       -      +
    222A  PHE*     3.7    22.8    -      -       +      -
    225A  LEU*     3.8    15.7    -      -       +      +
    226A  ARG*     3.9    39.7    -      -       +      +
    229A  VAL*     3.9    23.8    -      -       +      -
    282A  LEU*     4.1    20.6    -      -       +      -
----------------------------------------------------------
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Residues in contact with ARG 125 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    119A  ASP*     4.8     0.6    +      -       -      -
    121A  ASN*     3.0    52.2    +      -       -      +
    122A  ASP*     3.1    30.9    +      -       -      +
    124A  LEU*     1.3    72.7    -      -       -      +
    126A  PHE*     1.3    61.3    +      -       -      +
    128A  ALA*     3.3     6.4    +      -       -      +
    129A  CYS*     2.8    31.6    +      -       -      +
    218A  GLU*     4.2     4.2    -      -       -      +
    222A  PHE*     3.9    24.8    -      -       +      -
----------------------------------------------------------
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Residues in contact with PHE 126 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    112A  PHE*     4.9     9.9    -      +       -      -
    115A  GLN*     3.4    38.1    -      -       +      -
    117A  PHE*     3.7    19.7    -      +       +      -
    122A  ASP      3.0    13.0    +      -       -      +
    123A  GLN      3.5     8.7    -      -       -      +
    125A  ARG*     1.3    76.6    -      -       -      +
    127A  ALA*     1.3    58.8    +      -       -      +
    129A  CYS*     3.1     7.6    +      -       -      +
    130A  LEU*     2.8    45.5    +      -       +      +
    322A  VAL*     3.9    17.0    -      -       +      -
    328A  CYS*     4.1    17.9    -      -       +      -
    350A  LEU*     5.1     4.9    -      -       +      -
    353A  MET*     3.6    27.6    -      -       +      +
----------------------------------------------------------
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Residues in contact with ALA 127 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    123A  GLN      3.0    16.7    +      -       -      +
    124A  LEU*     3.7     6.1    -      -       -      +
    125A  ARG      3.3     0.2    -      -       -      -
    126A  PHE*     1.3    77.9    -      -       -      +
    128A  ALA*     1.3    62.0    +      -       -      +
    130A  LEU*     3.1     7.8    +      -       -      +
    131A  ILE*     2.9    29.1    +      -       -      +
    225A  LEU*     4.0    12.3    -      -       +      -
    280A  VAL*     4.5     8.3    -      -       +      -
    282A  LEU*     4.3    15.7    -      -       +      -
    322A  VAL*     4.2    23.3    -      -       +      -
----------------------------------------------------------
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Residues in contact with ALA 128 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    124A  LEU      2.8    21.0    +      -       -      +
    125A  ARG*     3.6     6.7    -      -       -      +
    127A  ALA*     1.3    73.5    -      -       -      +
    129A  CYS*     1.3    63.9    +      -       -      +
    131A  ILE*     3.4     1.5    +      -       -      -
    132A  SER*     3.1    23.2    +      -       -      -
    218A  GLU*     3.8    28.6    -      -       +      +
    221A  LEU*     3.7    13.9    -      -       +      +
    222A  PHE*     3.9    18.6    -      -       +      +
    225A  LEU*     3.8     7.3    -      -       +      +
----------------------------------------------------------
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Residues in contact with CYS 129 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    125A  ARG      2.8    15.9    +      -       -      +
    126A  PHE*     3.5     5.4    -      -       -      +
    128A  ALA*     1.3    76.8    -      -       -      +
    130A  LEU*     1.3    62.6    +      -       -      +
    132A  SER*     3.4     3.9    +      -       -      -
    133A  GLY*     3.0    19.2    +      -       -      -
    218A  GLU*     3.0    32.5    +      -       -      +
    352A  HIS      5.2     0.7    -      -       -      -
    353A  MET*     3.7    46.2    -      -       +      +
----------------------------------------------------------
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Residues in contact with LEU 130 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    112A  PHE*     4.6    12.8    -      -       +      -
    126A  PHE*     2.8    32.5    +      -       +      +
    127A  ALA*     3.4    10.8    -      -       -      +
    129A  CYS*     1.3    74.3    -      -       -      +
    131A  ILE*     1.3    73.8    +      -       +      +
    133A  GLY*     3.1     2.9    +      -       -      -
    134A  VAL*     3.1    31.0    +      -       +      +
    280A  VAL*     5.0     4.5    -      -       +      -
    320A  PHE*     3.8    47.8    -      -       +      -
    321A  VAL      6.0     0.2    -      -       -      +
    322A  VAL*     4.6    10.8    -      -       +      -
    329A  GLY      5.9     0.2    -      -       -      +
    349A  LEU*     5.0     5.5    -      -       +      +
    350A  LEU*     5.9     0.4    -      -       +      -
    353A  MET*     3.8    20.3    -      -       +      +
----------------------------------------------------------
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Residues in contact with ILE 131 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    127A  ALA      2.9    20.5    +      -       -      +
    128A  ALA*     3.8     4.0    -      -       -      +
    130A  LEU*     1.3    79.0    -      -       +      +
    132A  SER*     1.3    64.3    +      -       -      +
    134A  VAL*     3.0    17.7    +      -       +      +
    135A  LEU*     3.0    23.2    +      -       +      +
    196A  VAL*     4.4    22.0    -      -       +      -
    198A  VAL*     5.1     0.2    -      -       +      -
    207A  LEU*     4.1    23.1    -      -       +      -
    209A  VAL*     4.5     2.2    -      -       +      -
    221A  LEU*     4.0    22.7    -      -       +      -
    225A  LEU*     4.6    16.6    -      -       +      -
    278A  CYS*     6.3     0.4    -      -       -      -
    280A  VAL*     3.9    36.1    -      -       +      -
----------------------------------------------------------
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Residues in contact with SER 132 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    128A  ALA      3.1    16.5    +      -       -      -
    129A  CYS*     3.5     8.3    -      -       -      -
    131A  ILE*     1.3    78.8    -      -       -      +
    133A  GLY*     1.3    62.1    +      -       -      +
    135A  LEU*     3.2     6.2    +      -       -      -
    136A  SER*     3.1     8.4    +      -       -      -
    215A  ARG*     3.0    35.0    +      -       -      +
    216A  LEU      5.5     2.1    +      -       -      -
    218A  GLU*     4.7    19.6    +      -       -      +
    221A  LEU*     4.0    14.3    -      -       -      +
----------------------------------------------------------
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Residues in contact with GLY 133 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    129A  CYS      3.0    15.5    +      -       -      -
    130A  LEU*     3.1     4.6    +      -       -      -
    132A  SER*     1.3    76.0    -      -       -      +
    134A  VAL*     1.3    56.6    +      -       -      +
    136A  SER*     3.4     7.6    +      -       -      -
    137A  TYR*     2.9    23.7    +      -       -      +
    348A  HIS*     5.7     0.5    +      -       -      -
    349A  LEU*     3.1    25.2    -      -       -      +
    352A  HIS*     5.7     8.1    -      -       -      -
    353A  MET*     5.6     2.7    -      -       -      -
----------------------------------------------------------
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Residues in contact with VAL 134 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    130A  LEU*     3.4    19.7    -      -       +      +
    131A  ILE*     3.0    12.0    +      -       +      +
    133A  GLY*     1.3    73.6    -      -       -      +
    135A  LEU*     1.3    63.5    +      -       +      +
    137A  TYR*     3.8     2.1    -      -       -      +
    138A  LYS*     2.8    29.4    +      -       +      +
    169A  PHE*     3.7    26.4    -      -       +      -
    196A  VAL*     6.1     1.6    -      -       +      -
    277A  ILE*     4.1    19.1    -      -       +      -
    278A  CYS*     4.6     9.4    -      -       -      -
    320A  PHE*     4.0    17.0    -      -       +      -
    349A  LEU*     3.7    29.4    -      -       +      -
----------------------------------------------------------
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Residues in contact with LEU 135 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    131A  ILE*     3.0    22.6    +      -       +      +
    132A  SER*     3.2    11.4    +      -       -      +
    134A  VAL*     1.3    78.2    -      -       +      +
    136A  SER*     1.3    58.4    +      -       -      +
    138A  LYS*     3.5     7.5    +      -       +      +
    139A  THR*     2.9    30.7    +      -       -      -
    194A  GLU*     5.7     1.8    -      -       -      +
    196A  VAL*     5.3     1.3    -      -       +      -
    209A  VAL*     3.8    46.7    -      -       +      +
    215A  ARG*     3.7    34.3    -      -       +      +
    216A  LEU      4.8     6.3    -      -       -      +
    221A  LEU*     4.9     4.7    -      -       +      -
    277A  ILE*     4.0    16.4    -      -       +      -
----------------------------------------------------------
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Residues in contact with SER 136 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    132A  SER*     3.1     7.7    +      -       -      -
    133A  GLY*     3.6    10.0    -      -       -      -
    135A  LEU*     1.3    74.9    -      -       -      +
    137A  TYR*     1.3    65.6    +      -       -      +
    139A  THR*     3.0    15.8    +      -       -      +
    140A  LEU*     3.1    18.5    +      -       -      +
    215A  ARG*     2.9    30.2    +      -       -      +
    348A  HIS*     5.9     1.8    -      -       -      -
    352A  HIS*     5.6     8.1    -      -       -      -
----------------------------------------------------------
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Residues in contact with TYR 137 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    133A  GLY      2.9    17.6    +      -       -      +
    134A  VAL*     3.8     4.3    -      -       -      +
    136A  SER*     1.3    74.7    -      -       -      +
    138A  LYS*     1.3    62.5    +      -       -      +
    140A  LEU*     3.1    20.1    +      -       +      +
    141A  LEU*     3.2    23.4    +      -       +      +
    146A  LEU*     3.9    20.6    -      -       +      +
    165A  TYR*     3.4    29.6    -      -       -      -
    168A  LEU*     3.9    13.2    -      -       +      -
    169A  PHE*     3.7    20.4    -      +       +      -
    344A  GLN      4.8     0.7    -      -       -      -
    345A  CYS*     3.9    26.9    +      -       -      -
    348A  HIS*     3.3    52.4    -      +       +      +
    349A  LEU*     3.8    13.7    -      -       +      -
----------------------------------------------------------
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Residues in contact with LYS 138 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    134A  VAL*     2.8    19.4    +      -       +      +
    135A  LEU*     3.8     9.2    -      -       +      +
    137A  TYR*     1.3    76.9    -      -       -      +
    139A  THR*     1.3    53.9    +      -       -      +
    141A  LEU*     3.4     6.0    +      -       +      +
    142A  ASP*     2.7    65.8    +      -       -      +
    169A  PHE*     4.1    33.9    -      -       +      -
    170A  SER*     6.5     0.7    -      -       -      -
    194A  GLU*     3.3    28.9    +      -       -      +
    277A  ILE*     4.1    38.1    -      -       +      -
----------------------------------------------------------
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Residues in contact with THR 139 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    135A  LEU      2.9    18.7    +      -       -      -
    136A  SER*     3.0    15.6    +      -       -      +
    138A  LYS*     1.3    76.1    -      -       -      +
    140A  LEU*     1.3    68.2    +      -       +      +
    142A  ASP*     3.6     6.8    +      -       -      +
    143A  SER*     3.2    25.7    +      -       -      +
    215A  ARG*     4.2    10.9    +      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 140 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    136A  SER      3.1    15.3    +      -       -      +
    137A  TYR*     3.1    13.1    +      -       +      +
    139A  THR*     1.3    80.3    -      -       +      +
    141A  LEU*     1.3    60.5    +      -       +      +
    143A  SER*     3.5     3.3    +      -       -      -
    144A  HIS      3.3     2.4    +      -       -      -
    145A  SER*     2.8    49.7    +      -       -      +
    146A  LEU*     3.7    20.5    +      -       +      +
    147A  PRO*     6.3     0.9    -      -       +      -
    348A  HIS*     3.7    32.3    -      -       +      +
    352A  HIS*     5.7     2.0    -      -       +      -
----------------------------------------------------------
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Residues in contact with LEU 141 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    137A  TYR*     3.2    23.6    +      -       +      +
    138A  LYS*     3.6     9.4    -      -       +      +
    139A  THR      3.2     0.2    -      -       -      -
    140A  LEU*     1.3    77.0    -      -       +      +
    142A  ASP*     1.3    62.4    +      -       -      +
    143A  SER      3.0     1.6    -      -       -      -
    144A  HIS*     2.7    28.9    +      -       -      +
    146A  LEU*     4.1    21.8    -      -       +      -
    165A  TYR*     3.4    40.2    -      -       +      +
    166A  TYR*     3.6    39.6    -      -       +      -
    169A  PHE*     4.0    31.4    -      -       +      +
----------------------------------------------------------
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Residues in contact with ASP 142 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    138A  LYS*     2.7    56.4    +      -       -      +
    139A  THR*     3.6     7.2    +      -       -      +
    141A  LEU*     1.3    80.7    -      -       -      +
    143A  SER*     1.3    57.5    +      -       -      +
    144A  HIS*     3.3    14.4    +      -       -      -
    166A  TYR*     5.9     0.4    -      -       -      -
    194A  GLU*     5.4     0.7    -      -       -      +
----------------------------------------------------------
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Residues in contact with SER 143 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     18A  TRP*     5.4     1.4    -      -       -      -
    139A  THR*     3.2    18.9    +      -       -      +
    140A  LEU*     3.5     2.1    +      -       -      +
    141A  LEU      3.0     0.6    -      -       -      -
    142A  ASP*     1.3    76.9    -      -       -      +
    144A  HIS*     1.3    71.8    +      -       -      +
    145A  SER*     2.7    27.6    +      -       -      -
----------------------------------------------------------
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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