Contacts of the helix formed by residues 133 - 158 (chain A) in PDB entry 4JR8


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 SER 133 (chain A).
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    128A  GLY*     4.0     2.9    -      -       -      -
    131A  VAL      4.3     0.2    +      -       -      -
    132A  LEU*     1.3    80.8    -      -       -      +
    134A  ALA*     1.3    63.9    +      -       -      +
    135A  GLY*     3.9     3.0    +      -       -      -
    136A  ALA*     3.4    22.6    +      -       -      +
    137A  GLU*     3.0    19.6    +      -       -      +
----------------------------------------------------------
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Residues in contact with ALA 134 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     69A  ILE*     3.6    31.2    -      -       +      -
     70A  ALA*     4.6    14.8    -      -       +      +
    127A  ALA*     3.5    15.0    -      -       -      -
    128A  GLY*     3.5    21.4    -      -       -      +
    133A  SER*     1.3    72.4    -      -       -      +
    135A  GLY*     1.3    59.6    +      -       -      +
    137A  GLU*     3.1     3.6    +      -       -      +
    138A  ARG*     2.8    36.1    +      -       -      +
----------------------------------------------------------
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Residues in contact with GLY 135 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    133A  SER*     3.4     3.9    +      -       -      -
    134A  ALA*     1.3    79.4    -      -       -      +
    136A  ALA*     1.3    60.1    +      -       -      +
    138A  ARG*     3.4     9.5    +      -       -      +
    139A  LEU*     3.0    32.4    +      -       -      +
----------------------------------------------------------
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Residues in contact with ALA 136 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    132A  LEU*     4.3    23.4    -      -       +      +
    133A  SER*     3.4    21.2    +      -       -      +
    134A  ALA      3.3     0.4    -      -       -      -
    135A  GLY*     1.3    74.9    -      -       -      +
    137A  GLU*     1.3    63.3    +      -       -      +
    139A  LEU*     3.3     8.5    +      -       -      +
    140A  VAL*     3.0    24.5    +      -       -      +
    302A  22B      4.6    12.3    -      -       +      +
----------------------------------------------------------
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Residues in contact with GLU 137 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    126A  SER*     3.5    23.7    -      -       -      +
    127A  ALA      2.4    28.5    -      -       -      +
    128A  GLY*     4.2     3.5    -      -       -      -
    129A  SER      4.3     9.8    -      -       -      +
    130A  GLY*     5.4     1.0    -      -       -      -
    132A  LEU*     3.8    23.7    +      -       +      +
    133A  SER      3.0    15.7    +      -       -      +
    134A  ALA      3.3     4.0    -      -       -      +
    136A  ALA*     1.3    77.6    -      -       -      +
    138A  ARG*     1.3    60.9    +      -       -      +
    140A  VAL*     2.7    28.7    -      -       +      +
    141A  TRP*     3.1    26.3    +      -       +      +
----------------------------------------------------------
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Residues in contact with ARG 138 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     69A  ILE*     3.4    36.2    -      -       -      +
     74A  ARG*     4.3     5.2    -      -       -      +
     76A  ILE*     4.3     2.2    -      -       -      +
    123A  ALA*     3.2    27.3    +      -       -      +
    124A  THR*     3.1    31.1    +      -       -      +
    125A  LEU      4.1     0.6    -      -       -      -
    126A  SER*     2.8    42.3    +      -       -      +
    134A  ALA      2.8    25.1    +      -       -      +
    135A  GLY*     3.7     8.3    -      -       -      +
    137A  GLU*     1.3    75.1    -      -       -      +
    139A  LEU*     1.3    60.3    +      -       +      +
    142A  TRP*     2.9    29.0    +      -       -      +
    193A  TRP*     4.2     9.4    -      -       +      -
    198A  GLU*     2.8    44.8    +      -       -      +
    199A  GLY*     5.1     2.6    +      -       -      -
----------------------------------------------------------
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Residues in contact with LEU 139 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    135A  GLY      3.0    22.0    +      -       -      +
    136A  ALA*     3.7     6.5    -      -       -      +
    137A  GLU      3.2     0.2    -      -       -      -
    138A  ARG*     1.3    76.7    -      -       +      +
    140A  VAL*     1.3    60.7    +      -       -      +
    142A  TRP*     3.5    14.3    -      -       +      +
    143A  GLY*     2.8    26.7    +      -       -      -
    193A  TRP*     5.6     1.6    -      -       +      -
    194A  LEU*     3.8    29.4    -      -       +      -
    200A  ILE*     6.2     1.1    -      -       +      -
    302A  22B      3.8    29.0    -      -       +      +
----------------------------------------------------------
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Residues in contact with VAL 140 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    132A  LEU*     4.8    11.7    -      -       +      -
    136A  ALA      3.0    14.0    +      -       -      +
    137A  GLU*     2.7    32.1    -      -       +      +
    139A  LEU*     1.3    76.2    -      -       -      +
    141A  TRP*     1.3    78.2    +      -       +      +
    143A  GLY*     3.2     2.4    +      -       -      -
    144A  ILE*     3.0    24.7    +      -       +      +
    302A  22B      4.0    27.6    -      -       +      +
----------------------------------------------------------
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Residues in contact with TRP 141 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    119A  THR*     3.8    29.5    -      -       +      +
    122A  VAL*     3.4    36.4    -      -       +      +
    123A  ALA*     3.4    24.2    -      -       +      +
    126A  SER*     4.0     4.9    -      -       -      -
    137A  GLU*     3.1    44.9    +      -       +      +
    140A  VAL*     1.3    88.8    -      -       +      +
    142A  TRP*     1.3    58.8    +      -       -      +
    144A  ILE*     2.8    42.1    -      -       +      +
    145A  SER*     2.8    17.8    +      -       -      -
----------------------------------------------------------
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Residues in contact with TRP 142 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    123A  ALA*     3.8     3.3    -      -       -      +
    138A  ARG      2.9    19.0    +      -       -      +
    139A  LEU*     3.5    18.6    -      -       +      +
    141A  TRP*     1.3    75.9    -      -       -      +
    143A  GLY*     1.3    77.3    +      -       -      +
    145A  SER*     3.3     6.5    +      -       -      -
    146A  THR*     2.8    53.5    +      -       +      -
    190A  PRO*     2.9    34.5    +      -       +      +
    191A  VAL*     5.0     7.2    -      -       +      -
    193A  TRP*     3.4    26.6    -      +       +      -
    194A  LEU*     4.0    28.8    -      -       +      +
    301A  RET      3.3    27.3    -      +       -      -
    302A  22B      5.8     2.5    -      -       +      -
----------------------------------------------------------
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Residues in contact with GLY 143 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    139A  LEU      2.8    15.1    +      -       -      -
    140A  VAL      3.6     4.3    -      -       -      -
    141A  TRP      3.2     0.2    -      -       -      -
    142A  TRP*     1.3    92.1    -      -       -      +
    144A  ILE*     1.3    56.5    +      -       -      +
    146A  THR*     3.3     3.8    +      -       -      -
    147A  ALA*     2.9    26.9    +      -       -      +
    302A  22B      3.7    23.3    -      -       -      +
----------------------------------------------------------
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Residues in contact with ILE 144 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    119A  THR*     3.8    14.6    -      -       +      -
    140A  VAL*     3.0    18.2    +      -       +      +
    141A  TRP*     2.8    47.3    -      -       +      +
    143A  GLY*     1.3    74.0    -      -       -      +
    145A  SER*     1.3    61.7    +      -       -      +
    147A  ALA*     3.2     5.8    +      -       -      +
    148A  PHE*     3.1    47.6    +      -       +      -
    302A  22B      3.9    32.6    -      -       +      +
----------------------------------------------------------
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Residues in contact with SER 145 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    116A  MET*     2.8    33.3    +      -       -      +
    119A  THR*     3.4    17.5    -      -       -      -
    120A  GLY*     3.7    10.1    +      -       -      -
    141A  TRP      2.8    17.8    +      -       -      -
    142A  TRP*     4.3     0.7    -      -       -      -
    144A  ILE*     1.3    78.6    -      -       -      +
    146A  THR*     1.3    59.5    +      -       -      +
    148A  PHE*     3.3     5.2    +      -       -      +
    149A  LEU      3.2    14.6    +      -       -      -
    301A  RET      3.2    31.4    -      -       -      -
----------------------------------------------------------
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Residues in contact with THR 146 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    142A  TRP*     2.8    52.6    +      -       +      -
    143A  GLY*     3.7     6.7    -      -       -      -
    144A  ILE      3.2     0.2    -      -       -      -
    145A  SER*     1.3    73.8    -      -       -      +
    147A  ALA*     1.3    66.1    +      -       -      +
    149A  LEU*     3.1     4.9    +      -       +      +
    150A  LEU*     2.9    43.3    +      -       +      +
    187A  LEU*     5.9     0.9    -      -       +      -
    190A  PRO*     4.1     6.2    -      -       +      +
    301A  RET      3.6    20.6    -      -       +      +
----------------------------------------------------------
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Residues in contact with ALA 147 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    143A  GLY      2.9    14.1    +      -       -      +
    144A  ILE      3.2     9.6    +      -       -      +
    146A  THR*     1.3    76.5    -      -       -      +
    148A  PHE*     1.3    62.5    +      -       -      +
    150A  LEU*     3.1    14.0    +      -       -      +
    151A  VAL*     3.0    30.5    +      -       +      +
    302A  22B      3.7    37.2    -      -       +      -
----------------------------------------------------------
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Residues in contact with PHE 148 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    112A  LEU*     3.7    32.0    -      -       +      +
    115A  LEU*     3.6    57.4    -      -       +      -
    116A  MET*     3.8     6.5    -      -       +      -
    119A  THR*     3.9     9.9    -      -       +      -
    144A  ILE*     3.1    41.8    +      -       +      -
    145A  SER      3.5     6.3    -      -       -      +
    146A  THR      3.2     0.2    -      -       -      -
    147A  ALA*     1.3    79.7    -      -       -      +
    149A  LEU*     1.3    60.4    +      -       -      +
    151A  VAL*     3.5     5.2    +      -       -      +
    152A  LEU*     3.0    25.0    +      -       -      +
    302A  22B      3.6    44.4    -      -       +      -
----------------------------------------------------------
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Residues in contact with LEU 149 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    116A  MET*     3.5    28.9    -      -       -      -
    145A  SER      3.2     6.6    +      -       -      +
    146A  THR*     3.1    10.6    +      -       +      +
    148A  PHE*     1.3    76.8    -      -       -      +
    150A  LEU*     1.3    55.4    +      -       +      +
    152A  LEU*     3.2     8.9    +      -       +      +
    153A  LEU*     2.7    63.4    +      -       +      +
    186A  TRP*     4.0    35.2    -      -       +      +
    187A  LEU*     3.8    24.2    -      -       +      -
    190A  PRO*     4.1     5.6    -      -       +      -
    301A  RET      4.0    21.1    -      -       +      -
----------------------------------------------------------
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Residues in contact with LEU 150 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    146A  THR*     2.9    37.2    +      -       +      +
    147A  ALA*     3.4    14.8    -      -       -      +
    149A  LEU*     1.3    79.0    -      -       +      +
    151A  VAL*     1.3    58.5    +      -       +      +
    153A  LEU*     3.3     7.5    +      -       +      +
    154A  TYR*     2.8    30.0    +      -       -      +
    187A  LEU*     4.4    20.4    -      -       +      -
----------------------------------------------------------
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Residues in contact with VAL 151 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    112A  LEU*     3.8    10.8    -      -       +      -
    147A  ALA*     3.0    21.8    +      -       +      +
    148A  PHE*     3.9     4.5    -      -       -      +
    150A  LEU*     1.3    75.7    -      -       +      +
    152A  LEU*     1.3    58.0    +      -       -      +
    154A  TYR*     3.1    11.7    +      -       +      +
    155A  PHE*     3.0    56.7    +      -       +      -
    302A  22B      4.2    34.3    -      -       +      -
----------------------------------------------------------
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Residues in contact with LEU 152 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     92A  LEU*     3.8    20.9    -      -       +      -
    109A  LEU*     3.5    34.0    -      -       +      +
    112A  LEU*     4.1    15.0    -      -       +      +
    113A  ASP*     3.7    41.7    -      -       +      +
    116A  MET*     4.8     9.0    -      -       -      -
    148A  PHE      3.0    17.8    +      -       -      +
    149A  LEU*     3.3     7.9    -      -       +      +
    151A  VAL*     1.3    75.2    -      -       -      +
    153A  LEU*     1.3    84.2    +      -       +      +
    154A  TYR      3.2     0.3    +      -       -      -
    155A  PHE      3.2     9.0    +      -       -      -
    156A  LEU*     3.3    13.0    +      -       +      +
    186A  TRP*     4.6     6.3    -      -       +      -
----------------------------------------------------------
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Residues in contact with LEU 153 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    149A  LEU*     2.7    38.9    +      -       +      +
    150A  LEU*     3.8     8.1    -      -       +      +
    152A  LEU*     1.3    87.0    -      -       +      +
    154A  TYR*     1.3    62.3    +      -       -      +
    156A  LEU*     3.3    19.4    -      -       +      +
    157A  PHE*     3.2    23.8    -      -       +      -
    182A  VAL*     4.5     9.0    -      -       +      +
    183A  THR*     4.0    34.8    -      -       +      +
    186A  TRP*     4.9     2.0    -      -       +      -
    187A  LEU*     3.6    42.2    -      -       +      +
----------------------------------------------------------
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Residues in contact with TYR 154 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    150A  LEU      2.8    14.4    +      -       -      +
    151A  VAL*     3.2    16.2    -      -       +      +
    152A  LEU      3.1     0.2    -      -       -      -
    153A  LEU*     1.3    79.1    -      -       -      +
    155A  PHE*     1.3    76.4    +      +       -      +
    157A  PHE*     3.1     8.9    +      -       +      +
    158A  SER*     2.9    53.8    +      -       -      -
----------------------------------------------------------
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Residues in contact with PHE 155 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    105A  THR*     5.5     1.0    -      -       +      +
    108A  SER*     4.9     9.2    -      -       -      -
    109A  LEU*     4.1    14.4    -      -       +      -
    112A  LEU*     3.4    22.4    -      -       +      -
    151A  VAL*     3.0    42.3    +      -       +      -
    152A  LEU*     3.2     6.2    +      -       -      +
    154A  TYR*     1.3    90.7    -      +       -      +
    156A  LEU*     1.3    66.8    +      -       -      +
    157A  PHE      3.1     0.9    +      -       -      -
    158A  SER*     5.5     0.7    -      -       -      -
    159A  SER*     2.7    50.5    +      -       -      +
    160A  LEU*     4.3     1.6    -      -       -      +
    302A  22B      3.5    53.2    -      -       +      -
----------------------------------------------------------
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Residues in contact with LEU 156 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     92A  LEU*     4.8     8.7    -      -       +      -
     95A  LEU*     3.9    31.9    -      -       +      -
    109A  LEU*     3.6    38.1    -      -       +      -
    152A  LEU*     3.3     8.8    +      -       +      +
    153A  LEU*     3.3    27.4    -      -       +      +
    155A  PHE*     1.3    78.4    -      -       -      +
    157A  PHE*     1.3    64.6    +      -       +      +
    160A  LEU*     3.6    18.6    -      -       -      +
    175A  PHE*     4.5     6.5    -      -       +      -
    179A  ARG*     3.8    22.2    -      -       +      -
    182A  VAL*     4.2    19.7    -      -       +      -
    183A  THR*     4.5     7.4    -      -       -      +
----------------------------------------------------------
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Residues in contact with PHE 157 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    153A  LEU*     3.2    23.1    -      -       +      -
    154A  TYR*     3.1    10.4    +      -       +      +
    155A  PHE      3.0     0.4    -      -       -      -
    156A  LEU*     1.3    82.3    -      -       +      +
    158A  SER*     1.3    55.0    +      -       -      +
    160A  LEU      4.4     0.2    -      -       -      -
    161A  SER*     2.7    31.9    +      -       -      -
    179A  ARG*     3.0    45.3    -      -       +      +
    180A  ASN*     4.1     6.5    -      -       -      -
    183A  THR*     3.4    35.2    -      -       +      -
----------------------------------------------------------
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Residues in contact with SER 158 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    154A  TYR*     2.9    50.3    +      -       -      -
    155A  PHE*     4.8     1.6    -      -       -      -
    157A  PHE*     1.3    74.2    -      -       -      +
    159A  SER*     1.3    59.1    +      -       -      +
    160A  LEU      2.8    12.4    +      -       -      -
    161A  SER*     3.0    20.4    +      -       -      -
    162A  GLY      5.0     0.2    +      -       -      -
----------------------------------------------------------
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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