Contacts of the helix formed by residues 117 - 144 (chain C) in PDB entry 4CKG


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 LEU 117 (chain C).
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     28C  VAL*     3.8    26.5    -      -       +      +
     31C  LEU*     6.0     6.1    -      -       +      -
     32C  GLU*     4.2    22.9    -      -       +      +
     35C  LEU*     5.4     8.1    -      -       +      -
    112C  LEU      4.2     4.8    +      -       -      +
    113C  VAL*     4.4    13.2    +      -       +      +
    115C  GLU      3.3     0.6    -      -       -      -
    116C  GLY*     1.4    82.6    -      -       -      +
    118C  ARG*     1.4    56.3    +      -       -      +
    119C  GLY      3.6     1.8    -      -       -      -
    120C  PHE*     3.8    19.4    +      -       +      +
    121C  ARG*     3.0    70.7    +      -       -      +
    180C  ILE*     4.6    19.1    -      -       +      -
----------------------------------------------------------
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Residues in contact with ARG 118 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    125A  ARG*     5.0     7.0    -      -       -      +
    129A  ARG*     0.6   187.9    -      -       -      +
    169A  ARG*     4.5     7.3    -      -       -      +
    114C  LYS*     3.5    19.6    +      -       -      +
    115C  GLU*     2.6    67.4    +      -       -      +
    117C  LEU*     1.4    76.0    -      -       -      +
    119C  GLY*     1.3    60.2    +      -       -      +
    121C  ARG*     3.5     4.1    +      -       -      +
    122C  GLU*     3.0    32.4    +      -       +      +
----------------------------------------------------------
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Residues in contact with GLY 119 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    129A  ARG*     5.6     0.7    -      -       -      -
    115C  GLU      4.7     1.0    +      -       -      -
    116C  GLY      5.4     0.8    -      -       -      -
    117C  LEU      3.6     0.2    -      -       -      -
    118C  ARG*     1.3    77.2    -      -       -      +
    120C  PHE*     1.3    59.1    +      -       -      +
    122C  GLU*     3.8     6.3    +      -       -      +
    123C  ALA*     3.1    27.4    +      -       -      +
    176C  GLN*     3.9    21.3    +      -       -      -
----------------------------------------------------------
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Residues in contact with PHE 120 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     24C  VAL*     5.1     0.7    -      -       +      -
     25C  GLU*     5.6     8.3    -      -       -      -
     28C  VAL*     4.2    24.0    -      -       +      -
    116C  GLY      5.5     2.0    +      -       -      +
    117C  LEU*     3.9    29.1    -      -       +      +
    118C  ARG      3.5     0.2    -      -       -      -
    119C  GLY*     1.3    72.1    -      -       -      +
    121C  ARG*     1.3    62.4    +      -       +      +
    123C  ALA*     3.2     3.9    +      -       +      +
    124C  ARG*     2.9    29.1    +      -       +      +
    173C  TYR*     3.4    63.3    -      +       -      -
    176C  GLN*     3.8    34.7    +      -       +      +
    177C  ILE*     3.5    27.1    -      -       +      -
    180C  ILE*     5.3     5.6    -      -       +      -
----------------------------------------------------------
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Residues in contact with ARG 121 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     25C  GLU*     5.6     6.3    +      -       -      +
     28C  VAL*     3.9    23.4    -      -       -      +
     29C  SER*     4.5     9.7    +      -       -      -
     32C  GLU*     2.6    47.6    +      -       -      +
    113C  VAL      6.0     0.4    +      -       -      -
    117C  LEU*     3.0    48.1    +      -       +      +
    118C  ARG*     3.5     4.2    +      -       -      +
    120C  PHE*     1.3    76.0    -      -       +      +
    122C  GLU*     1.4    58.7    +      -       +      +
    124C  ARG*     3.3    14.3    +      -       +      +
    125C  ARG*     2.9    27.9    +      -       -      +
----------------------------------------------------------
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Residues in contact with GLU 122 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    122A  GLU*     1.6    33.1    -      -       -      +
    125A  ARG*     1.7    35.1    +      -       -      +
    129A  ARG*     5.6     0.4    -      -       -      +
    118C  ARG*     3.0    26.1    +      -       +      +
    119C  GLY*     3.9     6.7    -      -       -      +
    121C  ARG*     1.4    75.9    -      -       -      +
    123C  ALA*     1.3    58.8    +      -       -      +
    125C  ARG*     2.6    37.1    +      -       -      +
    126C  ASP*     3.5    16.3    +      -       -      +
----------------------------------------------------------
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Residues in contact with ALA 123 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    119C  GLY      3.1    20.2    +      -       -      +
    120C  PHE*     3.2     8.5    +      -       +      +
    122C  GLU*     1.3    71.5    -      -       -      +
    124C  ARG*     1.4    59.1    +      -       -      +
    126C  ASP*     3.8     3.9    +      -       -      +
    127C  PHE*     3.0    32.7    +      -       -      +
    169C  ARG*     5.1     2.0    -      -       -      +
    172C  ASP*     4.5     9.6    -      -       +      -
    173C  TYR*     4.4    25.6    -      -       +      +
    176C  GLN*     4.5    10.3    -      -       +      -
----------------------------------------------------------
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Residues in contact with ARG 124 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     25C  GLU*     2.8    45.3    +      -       -      +
    120C  PHE*     2.9    19.4    +      -       +      +
    121C  ARG*     3.3    18.6    -      -       +      +
    123C  ALA*     1.4    71.5    -      -       -      +
    125C  ARG*     1.4    63.9    +      -       -      +
    127C  PHE*     4.2     5.4    -      -       -      -
    128C  TRP*     3.2    70.8    +      -       -      +
    173C  TYR*     4.4    23.4    -      -       +      -
----------------------------------------------------------
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Residues in contact with ARG 125 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    118A  ARG*     4.9     2.4    -      -       -      +
    122A  GLU*     1.6    63.5    +      -       -      +
    121C  ARG      2.9    16.4    +      -       -      +
    122C  GLU*     2.6    27.0    +      -       -      +
    123C  ALA      3.4     0.8    -      -       -      -
    124C  ARG*     1.4    79.8    -      -       -      +
    126C  ASP*     1.3    60.2    +      -       -      +
    128C  TRP*     3.4     3.8    +      -       -      +
    129C  ARG*     2.9    50.6    +      -       +      +
----------------------------------------------------------
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Residues in contact with ASP 126 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    122C  GLU      3.5    12.5    +      -       -      +
    123C  ALA*     4.2     3.6    -      -       -      +
    125C  ARG*     1.3    79.9    -      -       -      +
    127C  PHE*     1.4    56.8    +      -       -      +
    129C  ARG*     2.7    31.6    +      -       -      +
    130C  GLY      2.9    26.2    +      -       -      -
    169C  ARG*     2.6    58.4    +      -       +      +
----------------------------------------------------------
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Residues in contact with PHE 127 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     17C  PHE*     3.9    18.8    -      +       -      -
     21C  ILE*     3.6    40.6    -      -       +      -
    123C  ALA      3.0    24.7    +      -       -      +
    124C  ARG*     3.8     3.1    -      -       -      +
    125C  ARG      3.5     0.2    -      -       -      -
    126C  ASP*     1.4    70.0    -      -       -      +
    128C  TRP*     1.4    73.6    +      +       -      +
    130C  GLY*     3.6     0.7    +      -       -      -
    131C  ALA*     3.1    19.4    +      -       -      +
    166C  TYR*     3.6    33.2    -      +       -      -
    169C  ARG*     3.9    16.2    -      -       +      +
    170C  ALA*     3.5    41.1    -      -       +      -
    173C  TYR*     3.8    29.8    -      +       +      -
----------------------------------------------------------
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Residues in contact with TRP 128 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     21C  ILE*     4.7    17.9    -      -       +      +
     22C  GLU*     6.2     4.7    -      -       +      -
     25C  GLU*     4.8     4.8    +      -       -      -
    124C  ARG*     3.2    67.8    +      -       +      +
    125C  ARG*     3.9     3.4    -      -       -      +
    127C  PHE*     1.4    93.7    -      +       -      +
    129C  ARG*     1.4    60.5    +      -       -      +
    131C  ALA*     3.4     9.7    +      -       +      +
    132C  GLU*     3.1    26.5    +      -       -      +
    173C  TYR*     5.8     1.0    -      -       -      -
----------------------------------------------------------
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Residues in contact with ARG 129 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    115A  GLU*     5.8     0.2    -      -       -      +
    118A  ARG*     0.6   214.7    -      -       -      +
    119A  GLY*     5.0     2.6    -      -       -      +
    122A  GLU*     5.7     1.2    -      -       -      +
    125C  ARG*     2.9    30.2    +      -       -      +
    126C  ASP*     2.7    36.3    +      -       -      +
    128C  TRP*     1.4    78.4    -      -       -      +
    130C  GLY*     1.3    49.8    +      -       -      +
    132C  GLU*     3.4    15.6    -      -       -      +
    133C  SER*     2.9    30.1    +      -       -      -
    169C  ARG*     3.9     7.0    -      -       -      +
----------------------------------------------------------
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Residues in contact with GLY 130 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    126C  ASP      2.9    14.6    +      -       -      -
    127C  PHE      3.8     2.5    -      -       -      -
    129C  ARG*     1.3    69.1    -      -       -      +
    131C  ALA*     1.4    58.0    +      -       -      +
    132C  GLU      3.3     0.2    -      -       -      -
    133C  SER*     3.8     4.9    -      -       -      -
    134C  LEU*     2.9    27.4    +      -       -      +
    162C  ALA*     4.8     2.3    -      -       -      +
    166C  TYR*     3.7    14.5    -      -       -      +
    169C  ARG*     3.5    29.1    -      -       -      +
----------------------------------------------------------
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Residues in contact with ALA 131 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     18C  ARG*     4.7    17.4    +      -       -      +
    127C  PHE      3.1    14.9    +      -       -      +
    128C  TRP*     3.4    15.2    +      -       +      +
    130C  GLY*     1.4    73.5    -      -       -      +
    132C  GLU*     1.3    52.9    +      -       -      +
    134C  LEU*     3.2     6.2    +      -       -      +
    135C  GLU*     2.8    37.9    +      -       -      +
    166C  TYR*     3.7    19.7    -      -       +      +
----------------------------------------------------------
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Residues in contact with GLU 132 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    114A  LYS*     5.5     4.3    +      -       -      -
    128C  TRP      3.1    14.2    +      -       -      +
    129C  ARG*     3.4    19.1    -      -       -      +
    131C  ALA*     1.3    75.9    -      -       -      +
    133C  SER*     1.3    59.1    +      -       -      +
    135C  GLU*     3.4     6.5    +      -       -      +
    136C  ALA*     3.1    24.0    +      -       +      +
----------------------------------------------------------
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Residues in contact with SER 133 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    114A  LYS*     6.2     2.5    -      -       -      +
    115A  GLU*     5.3     8.3    +      -       -      -
    129C  ARG      2.9    16.5    +      -       -      -
    130C  GLY*     3.8    11.0    -      -       -      -
    131C  ALA      3.4     0.2    -      -       -      -
    132C  GLU*     1.3    73.9    -      -       -      +
    134C  LEU*     1.4    58.1    +      -       -      +
    136C  ALA*     4.0     3.3    -      -       -      +
    137C  ALA*     3.0    30.6    +      -       -      +
    162C  ALA*     4.4    12.0    -      -       -      +
    169C  ARG*     4.9     6.3    -      -       -      -
----------------------------------------------------------
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Residues in contact with LEU 134 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     13C  ASP*     4.4     0.7    -      -       -      +
     18C  ARG*     4.2    19.3    -      -       -      +
    130C  GLY      2.9    19.5    +      -       -      +
    131C  ALA*     3.2     5.8    +      -       -      +
    133C  SER*     1.4    74.6    -      -       -      +
    135C  GLU*     1.4    56.9    +      -       -      +
    137C  ALA*     3.4     3.7    -      -       -      +
    138C  LEU*     2.8    38.8    +      -       +      +
    159C  LEU*     3.8    21.8    -      -       +      -
    162C  ALA*     4.1     4.0    -      -       +      +
    163C  ARG*     3.4    64.2    -      -       -      +
    166C  TYR*     4.0    18.8    -      -       +      -
----------------------------------------------------------
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Residues in contact with GLU 135 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     18C  ARG*     5.5     4.9    +      -       -      -
    131C  ALA      2.8    19.5    +      -       -      +
    132C  GLU*     3.4     7.5    +      -       +      +
    134C  LEU*     1.4    72.3    -      -       -      +
    136C  ALA*     1.4    57.3    +      -       -      +
    138C  LEU*     3.4    15.4    +      -       +      +
    139C  THR*     2.7    35.4    +      -       -      +
----------------------------------------------------------
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Residues in contact with ALA 136 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    132C  GLU      3.1    15.7    +      -       -      +
    133C  SER*     4.3     3.8    -      -       -      +
    135C  GLU*     1.4    72.0    -      -       -      +
    137C  ALA*     1.3    55.2    +      -       -      +
    139C  THR*     3.7     8.7    -      -       -      -
    140C  HIS*     2.7    55.8    +      -       +      +
----------------------------------------------------------
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Residues in contact with ALA 137 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    133C  SER      3.0    20.3    +      -       -      +
    134C  LEU*     3.4     5.2    -      -       -      +
    136C  ALA*     1.3    74.9    -      -       -      +
    138C  LEU*     1.4    61.6    +      -       -      +
    140C  HIS*     4.0     3.6    -      -       -      +
    141C  ASN*     3.1    24.3    +      -       -      +
    155C  ALA      4.9     2.8    -      -       -      +
    158C  ALA*     4.6     4.7    -      -       +      +
    159C  LEU*     4.0    23.0    -      -       +      +
    162C  ALA*     3.5    24.5    -      -       +      -
----------------------------------------------------------
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Residues in contact with LEU 138 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    134C  LEU*     2.8    33.2    +      -       +      +
    135C  GLU*     3.7    16.2    -      -       +      +
    137C  ALA*     1.4    73.0    -      -       -      +
    139C  THR*     1.4    53.4    +      -       -      +
    141C  ASN*     3.2     5.3    +      -       -      +
    142C  ALA*     2.8    37.2    +      -       -      +
    159C  LEU*     4.1    18.6    -      -       +      -
    163C  ARG*     4.0    22.7    -      -       -      +
    254D  GLU*     4.2     3.6    -      -       -      +
    273D  PHE*     4.3    15.1    -      -       +      -
    285D  ARG*     3.8    28.9    -      -       -      +
    343D  ASP*     3.8    21.1    -      -       -      +
----------------------------------------------------------
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Residues in contact with THR 139 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    135C  GLU*     2.7    31.3    +      -       -      +
    136C  ALA*     3.1    10.9    +      -       -      -
    138C  LEU*     1.4    72.8    -      -       -      +
    140C  HIS*     1.3    64.4    +      -       +      +
    142C  ALA*     3.4     3.2    +      -       -      -
    143C  GLU*     3.1    42.0    +      -       +      +
    273D  PHE*     5.0     5.6    -      -       -      -
----------------------------------------------------------
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Residues in contact with HIS 140 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    106A  GLN*     6.5     0.2    -      -       +      -
    136C  ALA*     2.7    40.7    +      -       +      +
    137C  ALA*     4.5     3.1    -      -       -      +
    139C  THR*     1.3    83.5    -      -       +      +
    141C  ASN*     1.4    58.4    +      -       -      +
    143C  GLU*     4.0     8.5    +      -       -      +
    144C  VAL*     4.1    11.8    +      -       -      +
    155C  ALA*     3.9    21.2    -      -       +      +
----------------------------------------------------------
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Residues in contact with ASN 141 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    137C  ALA      3.1    20.4    +      -       -      +
    138C  LEU*     3.2     4.4    +      -       -      +
    140C  HIS*     1.4    76.2    -      -       -      +
    142C  ALA*     1.3    63.7    +      -       -      +
    144C  VAL*     3.7     5.4    -      -       -      +
    155C  ALA*     4.7     7.6    -      -       -      +
    156C  GLY*     3.6    20.7    +      -       -      -
    159C  LEU*     3.5    28.3    -      -       +      +
    326D  ARG*     2.6    53.0    +      -       -      +
    327D  PHE*     4.4     1.7    -      -       -      -
    341D  GLN*     4.9     0.2    +      -       -      -
    343D  ASP*     3.4    33.7    +      -       -      +
----------------------------------------------------------
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Residues in contact with ALA 142 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    138C  LEU      2.8    20.4    +      -       -      +
    139C  THR*     4.1     2.9    -      -       -      +
    141C  ASN*     1.3    78.1    -      -       -      +
    143C  GLU*     1.4    63.5    +      -       -      +
    144C  VAL*     3.5     5.9    +      -       -      +
    273D  PHE*     3.9    25.6    -      -       +      -
    325D  ARG*     3.5    11.1    +      -       -      +
    326D  ARG*     5.0     0.3    -      -       -      +
    341D  GLN*     2.8    42.2    +      -       -      +
    342D  ALA      6.0     0.9    -      -       -      +
----------------------------------------------------------
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Residues in contact with GLU 143 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    139C  THR*     3.1    33.0    +      -       +      +
    140C  HIS*     4.0     4.0    +      -       -      +
    141C  ASN      3.6     0.6    -      -       -      -
    142C  ALA*     1.4    76.5    -      -       +      +
    144C  VAL*     1.4    62.3    +      -       -      +
    145C  PRO*     3.7     6.6    -      -       -      +
    283D  TRP*     4.1    15.9    -      -       -      +
    325D  ARG*     2.6    46.8    +      -       -      +
----------------------------------------------------------
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Residues in contact with VAL 144 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    140C  HIS      4.1    11.9    +      -       -      +
    141C  ASN*     3.7    10.8    -      -       -      +
    142C  ALA      3.5     2.8    -      -       -      +
    143C  GLU*     1.4    75.5    -      -       -      +
    145C  PRO*     1.4    77.0    -      -       +      +
    146C  ARG      3.9     0.9    +      -       -      -
    148C  ARG*     4.0    11.2    -      -       +      +
    151C  GLU*     4.6     4.9    -      -       +      -
    152C  ALA*     3.7    38.6    -      -       +      +
    155C  ALA*     5.7     1.3    -      -       +      -
    325D  ARG*     5.3     1.7    -      -       -      -
    326D  ARG*     3.5    42.4    +      -       -      +
----------------------------------------------------------
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A short description of the analytical approach
The contact analysis used in this page is based upon the approach developed in: Sobolev V., Wade R.C., Vriend G. and Edelman M. PROTEINS (1996) 25, 120-129. Contact legitimacy depends on the hydrophobic-hydrophilic properties of the contacting atoms. In order to define it, for each inter-atomic contact, eight atom classes have been introduced:


   I  Hydrophilic      - N and O that can donate and accept hydrogen bonds
                         (e.g., oxygen of hydroxyl group of Ser. or Thr)
  II  Acceptor         - N or O that can only accept a hydrogen bond
 III  Donor            - N that can only donate a hydrogen bond
  IV  Hydrophobic      - Cl, Br, I and all C atoms that are not in
                         aromatic rings and do not have a covalent bond to
                         a N or O atom
   V  Aromatic         - C in aromatic rings irrespective of any other 
                         bonds formed by the atom
  VI  Neutral          - C atoms that have a covalent bond to at least one
                         atom of class I or two or more atoms from class II
                         or III; atoms; S, F, P, and metal atoms in all cases
 VII  Neutral-donor    - C atoms that have a covalent bond with only one
                         atom of class III
VIII  Neutral-acceptor - C atoms that have a covalent bond with only 
                         one atom of class II
For each pair of contacts the state of legitimacy is shown below:

Legend:
+, legitimate
-, illegitimate
------------------------------------------------------------
  Atomic class           I  II  III   IV   V   VI  VII  VIII
------------------------------------------------------------
   I  (Hydrophilic)      +   +    +    -   +   +    +    +
  II  (Acceptor)         +   -    +    -   +   +    +    -
 III  (Donor)            +   +    -    -   +   +    -    +
  IV  (Hydrophobic)      -   -    -    +   +   +    +    +
   V  (Aromatic)         +   +    +    +   +   +    +    +
  VI  (Neutral)          +   +    +    +   +   +    +    +
 VII  (Neutral-donor)    +   +    -    +   +   +    -    +
VIII  (Neutral-acceptor) +   -    +    +   +   +    +    -
------------------------------------------------------------
Warning!
Atom classes for heterogroups are automatically assigned based on the atomic coordinates. However, in three cases (see below) the automatic assignment is currently ambiguous. In these cases, the user is advised to manually analyse the full list of contacts using LPC software.
1. Carbon atoms belonging to a 4-, 5- or 6-member ring are 
   considered "aromatic" (Class V) if the ring is approximately
   planar, and "hydrophobic" (Class IV) or "neutral" (Classes
   VI, VII, VIII) if the ring is non-planar.
2. The oxygen atom of a carbonyl or hydroxy group is considered
   "hydroxy" (Class I) if the CO bond is longer than 1.29 Å, and
   "carbonyl" (Class II) if shorter.
3. All nitrogen atoms are considered "hydrophilic" (Class I).

Please E-mail any questions and/or suggestions concerning this page to Vladimir.Sobolev@weizmann.ac.il