Contacts of the helix formed by residues 117 - 144 (chain A) 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 A).
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     28A  VAL*     3.8    26.0    -      -       +      +
     31A  LEU*     6.0     5.2    -      -       +      -
     32A  GLU*     4.2    22.7    -      -       +      +
     35A  LEU*     5.4     8.5    -      -       +      -
    112A  LEU      4.2     4.3    +      -       -      +
    113A  VAL*     4.4    13.4    +      -       +      +
    115A  GLU      3.3     0.4    -      -       -      -
    116A  GLY*     1.4    82.3    -      -       -      +
    118A  ARG*     1.4    57.8    +      -       -      +
    119A  GLY      3.6     1.6    -      -       -      -
    120A  PHE*     3.8    20.9    +      -       +      +
    121A  ARG*     3.0    70.3    +      -       +      +
    180A  ILE*     4.6    20.6    -      -       +      -
----------------------------------------------------------
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Residues in contact with ARG 118 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    114A  LYS*     3.5    19.4    +      -       -      +
    115A  GLU*     2.6    68.0    +      -       -      +
    117A  LEU*     1.4    75.0    -      -       -      +
    119A  GLY*     1.3    59.5    +      -       -      +
    121A  ARG*     3.5     3.9    +      -       -      +
    122A  GLU*     3.0    31.5    +      -       +      +
    125C  ARG*     4.9     8.1    -      -       -      +
    129C  ARG*     0.6   191.9    -      -       -      +
    169C  ARG*     4.6     7.3    -      -       -      +
----------------------------------------------------------
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Residues in contact with GLY 119 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    115A  GLU      4.7     1.0    +      -       -      -
    116A  GLY      5.4     0.6    -      -       -      -
    117A  LEU      3.6     0.4    -      -       -      -
    118A  ARG*     1.3    77.8    -      -       -      +
    120A  PHE*     1.3    59.1    +      -       -      +
    122A  GLU*     3.8     6.2    +      -       -      +
    123A  ALA*     3.1    27.5    +      -       -      +
    176A  GLN*     3.9    20.3    +      -       -      -
    129C  ARG*     5.5     1.3    -      -       -      -
----------------------------------------------------------
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Residues in contact with PHE 120 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     24A  VAL*     5.1     0.7    -      -       +      -
     25A  GLU*     5.6     8.1    -      -       -      -
     28A  VAL*     4.2    24.5    -      -       +      -
    116A  GLY      5.5     2.0    +      -       -      +
    117A  LEU*     3.8    29.3    +      -       +      +
    118A  ARG      3.5     0.2    -      -       -      -
    119A  GLY*     1.3    73.4    -      -       -      +
    121A  ARG*     1.3    61.0    +      -       +      +
    123A  ALA*     3.2     3.7    +      -       +      +
    124A  ARG*     2.9    29.8    +      -       +      +
    173A  TYR*     3.4    63.5    -      +       -      -
    176A  GLN*     3.8    34.7    +      -       +      +
    177A  ILE*     3.5    27.1    -      -       +      -
    180A  ILE*     5.3     6.1    -      -       +      -
----------------------------------------------------------
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Residues in contact with ARG 121 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     25A  GLU*     5.6     6.1    +      -       -      +
     28A  VAL*     3.9    23.4    -      -       -      +
     29A  SER*     4.5     9.9    +      -       -      -
     32A  GLU*     2.6    48.0    +      -       -      +
    113A  VAL      6.0     0.4    +      -       -      -
    117A  LEU*     3.0    48.0    +      -       +      +
    118A  ARG*     4.0     4.3    -      -       -      +
    120A  PHE*     1.3    76.1    -      -       +      +
    122A  GLU*     1.4    59.0    +      -       -      +
    124A  ARG*     3.3    14.0    +      -       +      +
    125A  ARG*     2.9    27.5    +      -       -      +
----------------------------------------------------------
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Residues in contact with GLU 122 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    118A  ARG*     3.0    21.9    +      -       +      +
    119A  GLY*     3.9     7.2    -      -       -      +
    121A  ARG*     1.4    74.4    -      -       +      +
    123A  ALA*     1.3    60.4    +      -       -      +
    125A  ARG*     2.6    37.7    +      -       -      +
    126A  ASP*     3.5    16.8    +      -       -      +
    122C  GLU*     1.6    23.8    -      -       -      +
    125C  ARG*     1.6    45.9    +      -       -      +
    129C  ARG*     5.7     0.9    -      -       -      +
----------------------------------------------------------
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Residues in contact with ALA 123 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    119A  GLY      3.1    19.6    +      -       -      +
    120A  PHE*     3.2     8.7    +      -       +      +
    122A  GLU*     1.3    71.5    -      -       -      +
    124A  ARG*     1.4    58.0    +      -       -      +
    125A  ARG      3.5     0.2    +      -       -      -
    126A  ASP*     3.8     3.0    +      -       -      +
    127A  PHE*     3.0    32.1    +      -       -      +
    169A  ARG*     5.1     2.6    -      -       -      +
    172A  ASP*     4.5    10.1    -      -       +      -
    173A  TYR*     4.4    25.1    -      -       +      +
    176A  GLN*     4.5    10.8    -      -       +      +
----------------------------------------------------------
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Residues in contact with ARG 124 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     25A  GLU*     2.8    45.6    +      -       -      +
    120A  PHE*     2.9    19.7    +      -       +      +
    121A  ARG*     3.3    18.8    -      -       +      +
    123A  ALA*     1.4    71.4    -      -       -      +
    125A  ARG*     1.4    63.9    +      -       -      +
    127A  PHE*     4.2     5.8    -      -       -      -
    128A  TRP*     3.2    68.9    +      -       -      +
    173A  TYR*     4.4    22.8    -      -       +      -
----------------------------------------------------------
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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
----------------------------------------------------------
    121A  ARG      2.9    16.5    +      -       -      +
    122A  GLU*     2.6    27.2    +      -       -      +
    123A  ALA      3.4     0.6    -      -       -      -
    124A  ARG*     1.4    78.0    -      -       -      +
    126A  ASP*     1.3    62.0    +      -       -      +
    128A  TRP*     3.4     3.5    +      -       -      +
    129A  ARG*     2.9    50.8    +      -       +      +
    118C  ARG*     5.0     2.2    -      -       -      +
    122C  GLU*     1.7    62.7    +      -       -      +
    125C  ARG*     5.4     0.2    -      -       -      -
----------------------------------------------------------
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Residues in contact with ASP 126 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    122A  GLU      3.5    13.4    +      -       -      +
    123A  ALA*     4.2     3.8    -      -       -      +
    125A  ARG*     1.3    79.2    -      -       -      +
    127A  PHE*     1.4    56.9    +      -       -      +
    129A  ARG*     2.7    31.8    +      -       -      +
    130A  GLY*     2.9    26.5    +      -       -      -
    169A  ARG*     2.6    57.8    +      -       +      +
----------------------------------------------------------
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Residues in contact with PHE 127 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     17A  PHE*     3.9    19.5    -      +       -      -
     21A  ILE*     3.6    40.4    -      -       +      -
    123A  ALA      3.0    24.3    +      -       -      +
    124A  ARG      3.8     2.7    -      -       -      +
    126A  ASP*     1.4    71.5    -      -       -      +
    128A  TRP*     1.4    75.3    +      +       -      +
    130A  GLY      3.6     0.5    +      -       -      -
    131A  ALA*     3.1    19.6    +      -       -      +
    166A  TYR*     3.6    34.4    -      +       -      -
    169A  ARG*     3.9    15.7    -      -       +      +
    170A  ALA*     3.5    42.6    -      -       +      -
    173A  TYR*     3.8    28.9    -      +       +      -
----------------------------------------------------------
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Residues in contact with TRP 128 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     21A  ILE*     4.7    17.9    -      -       +      +
     22A  GLU*     6.2     5.4    -      -       +      -
     25A  GLU*     4.8     4.8    +      -       -      -
    124A  ARG*     3.2    68.5    +      -       -      +
    125A  ARG*     3.9     3.1    -      -       -      +
    127A  PHE*     1.4    93.9    -      +       -      +
    129A  ARG*     1.4    60.9    +      -       -      +
    131A  ALA*     3.4    10.0    +      -       +      +
    132A  GLU*     3.1    26.3    +      -       -      +
    173A  TYR*     5.8     1.2    -      -       -      -
----------------------------------------------------------
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Residues in contact with ARG 129 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    125A  ARG*     2.9    30.6    +      -       -      +
    126A  ASP*     2.7    34.9    +      -       -      +
    128A  TRP*     1.4    76.8    -      -       -      +
    130A  GLY*     1.3    50.6    +      -       -      +
    132A  GLU*     3.4    16.5    -      -       -      +
    133A  SER*     2.9    30.5    +      -       -      -
    169A  ARG*     3.9     6.3    -      -       -      +
    118C  ARG*     0.6   247.6    -      -       -      +
    119C  GLY*     5.0     1.2    -      -       -      +
    122C  GLU*     5.6     1.2    -      -       -      +
----------------------------------------------------------
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Residues in contact with GLY 130 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    126A  ASP      2.9    14.5    +      -       -      -
    127A  PHE      3.8     1.8    -      -       -      -
    129A  ARG*     1.3    69.7    -      -       -      +
    131A  ALA*     1.4    59.2    +      -       -      +
    132A  GLU      3.3     0.2    -      -       -      -
    133A  SER*     3.8     5.5    -      -       -      -
    134A  LEU*     2.9    27.5    +      -       -      +
    162A  ALA      4.8     1.7    -      -       -      +
    166A  TYR*     3.7    16.1    -      -       -      +
    169A  ARG*     3.5    28.5    -      -       -      +
----------------------------------------------------------
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Residues in contact with ALA 131 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     18A  ARG*     4.7    17.1    +      -       -      +
    127A  PHE      3.1    13.9    +      -       -      +
    128A  TRP*     3.4    15.2    +      -       +      +
    130A  GLY*     1.4    74.1    -      -       -      +
    132A  GLU*     1.3    52.3    +      -       -      +
    134A  LEU*     3.2     6.1    +      -       -      +
    135A  GLU*     2.8    36.9    +      -       -      +
    166A  TYR*     3.7    20.2    -      -       +      +
----------------------------------------------------------
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Residues in contact with GLU 132 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    128A  TRP      3.1    13.1    +      -       -      +
    129A  ARG*     3.4    19.2    -      -       -      +
    130A  GLY      3.3     0.2    -      -       -      -
    131A  ALA*     1.3    77.5    -      -       -      +
    133A  SER*     1.3    59.0    +      -       -      +
    135A  GLU*     3.4     7.1    +      -       -      +
    136A  ALA*     3.1    23.6    +      -       -      +
    114C  LYS*     5.6     3.6    +      -       -      -
----------------------------------------------------------
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Residues in contact with SER 133 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    129A  ARG      2.9    18.0    +      -       -      -
    130A  GLY*     3.8     9.2    -      -       -      -
    131A  ALA      3.4     0.2    -      -       -      -
    132A  GLU*     1.3    72.7    -      -       -      +
    134A  LEU*     1.4    58.5    +      -       -      +
    136A  ALA*     3.7     3.8    +      -       -      +
    137A  ALA*     3.0    30.7    +      -       -      +
    162A  ALA*     4.4    11.7    -      -       -      +
    169A  ARG*     4.9     6.3    -      -       -      -
    114C  LYS*     6.0     3.6    -      -       -      +
    115C  GLU*     5.3     8.6    +      -       -      -
----------------------------------------------------------
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Residues in contact with LEU 134 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     13A  ASP*     4.4     1.1    -      -       -      +
     18A  ARG*     4.2    19.1    -      -       -      +
    130A  GLY      2.9    19.9    +      -       -      +
    131A  ALA*     3.4     5.8    -      -       -      +
    133A  SER*     1.4    75.0    -      -       -      +
    135A  GLU*     1.4    56.4    +      -       -      +
    137A  ALA*     3.3     5.0    +      -       -      +
    138A  LEU*     2.8    37.8    +      -       +      +
    159A  LEU*     3.8    21.5    -      -       +      -
    162A  ALA*     4.1     3.7    -      -       +      +
    163A  ARG*     3.4    63.9    -      -       -      +
    166A  TYR*     4.0    19.1    -      -       +      -
----------------------------------------------------------
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Residues in contact with GLU 135 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     18A  ARG*     5.5     4.7    +      -       -      -
    131A  ALA      2.8    20.6    +      -       -      +
    132A  GLU*     3.4     7.5    +      -       -      +
    134A  LEU*     1.4    72.7    -      -       -      +
    136A  ALA*     1.4    57.9    +      -       -      +
    138A  LEU*     3.4    14.4    +      -       +      +
    139A  THR*     2.7    35.2    +      -       -      +
----------------------------------------------------------
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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  GLU*     3.1    16.7    +      -       +      +
    133A  SER*     4.3     4.0    -      -       -      +
    135A  GLU*     1.4    73.4    -      -       -      +
    137A  ALA*     1.3    55.2    +      -       -      +
    139A  THR*     3.4     9.3    -      -       -      -
    140A  HIS*     2.7    54.8    +      -       +      +
----------------------------------------------------------
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Residues in contact with ALA 137 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    133A  SER*     3.0    21.4    +      -       -      +
    134A  LEU      3.4     4.9    -      -       -      +
    136A  ALA*     1.3    75.2    -      -       -      +
    138A  LEU*     1.4    60.6    +      -       -      +
    140A  HIS*     4.0     3.4    -      -       -      +
    141A  ASN*     3.1    24.4    +      -       -      +
    155A  ALA      4.9     3.0    -      -       -      +
    158A  ALA*     4.6     3.8    -      -       +      +
    159A  LEU*     4.0    22.0    -      -       +      +
    162A  ALA*     3.5    24.5    -      -       +      -
----------------------------------------------------------
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Residues in contact with LEU 138 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    134A  LEU*     2.8    32.5    +      -       +      +
    135A  GLU*     3.7    15.7    -      -       +      +
    137A  ALA*     1.4    72.3    -      -       -      +
    139A  THR*     1.4    54.8    +      -       -      +
    141A  ASN*     3.6     5.3    +      -       -      +
    142A  ALA*     2.8    37.3    +      -       -      +
    159A  LEU*     4.1    18.2    -      -       +      -
    163A  ARG*     4.0    22.2    -      -       -      +
    254B  GLU*     4.2     4.7    -      -       -      +
    273B  PHE*     4.3    15.3    -      -       +      -
    285B  ARG*     3.8    29.4    -      -       -      +
    343B  ASP*     3.8    20.4    -      -       -      +
----------------------------------------------------------
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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  GLU*     2.7    30.7    +      -       -      +
    136A  ALA*     3.1    11.7    +      -       +      -
    138A  LEU*     1.4    72.0    -      -       -      +
    140A  HIS*     1.3    67.6    +      -       +      +
    142A  ALA*     3.4     2.4    +      -       -      -
    143A  GLU*     3.1    41.9    +      -       +      +
    273B  PHE*     5.0     5.5    -      -       -      -
----------------------------------------------------------
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Residues in contact with HIS 140 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    136A  ALA*     2.7    40.9    +      -       +      +
    137A  ALA*     4.5     3.6    -      -       -      +
    139A  THR*     1.3    82.9    -      -       +      +
    141A  ASN*     1.4    57.6    +      -       -      +
    143A  GLU*     4.0     7.5    +      -       -      +
    144A  VAL*     4.1    12.1    +      -       -      +
    155A  ALA*     3.9    22.2    -      -       +      +
    106C  GLN*     6.5     0.9    -      -       +      -
----------------------------------------------------------
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Residues in contact with ASN 141 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    137A  ALA      3.1    19.5    +      -       -      +
    138A  LEU*     3.7     5.9    +      -       -      +
    140A  HIS*     1.4    76.4    -      -       -      +
    142A  ALA*     1.3    63.2    +      -       -      +
    144A  VAL*     3.7     4.3    -      -       -      +
    152A  ALA      4.5     0.2    -      -       -      +
    155A  ALA*     4.7     7.4    -      -       -      +
    156A  GLY*     3.6    21.0    +      -       -      -
    159A  LEU*     3.5    28.7    -      -       +      +
    326B  ARG*     2.6    53.4    +      -       -      +
    327B  PHE*     4.4     2.2    -      -       -      -
    341B  GLN*     4.9     0.2    +      -       -      -
    343B  ASP*     3.4    32.7    +      -       -      +
----------------------------------------------------------
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Residues in contact with ALA 142 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    138A  LEU      2.8    20.5    +      -       -      +
    139A  THR*     4.1     3.4    -      -       -      +
    141A  ASN*     1.3    77.8    -      -       -      +
    143A  GLU*     1.4    63.1    +      -       +      +
    144A  VAL      3.5     5.4    +      -       -      +
    273B  PHE*     3.9    24.9    -      -       +      -
    325B  ARG*     3.5    12.0    +      -       -      +
    326B  ARG*     5.0     0.7    -      -       -      +
    341B  GLN*     2.8    41.5    +      -       -      +
    342B  ALA      6.0     1.1    -      -       -      +
----------------------------------------------------------
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Residues in contact with GLU 143 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    139A  THR*     3.1    32.8    +      -       +      +
    140A  HIS*     4.0     4.2    +      -       -      +
    141A  ASN      3.6     0.4    -      -       -      -
    142A  ALA*     1.4    75.8    -      -       +      +
    144A  VAL*     1.4    62.3    +      -       -      +
    145A  PRO*     3.7     6.6    -      -       -      +
    283B  TRP*     4.1    15.7    -      -       -      +
    325B  ARG*     2.6    47.3    +      -       -      +
----------------------------------------------------------
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Residues in contact with VAL 144 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    140A  HIS      4.1    12.6    +      -       -      +
    141A  ASN*     3.7    11.0    -      -       -      +
    142A  ALA      4.1     2.6    -      -       -      +
    143A  GLU*     1.4    75.6    -      -       -      +
    145A  PRO*     1.4    76.1    -      -       +      +
    146A  ARG      3.9     1.0    +      -       -      -
    148A  ARG*     4.0    10.3    -      -       +      +
    151A  GLU*     4.6     6.1    -      -       +      -
    152A  ALA*     3.7    39.7    -      -       +      +
    155A  ALA*     5.7     1.3    -      -       +      -
    324B  GLU      4.7     0.2    -      -       -      +
    325B  ARG*     5.3     2.1    -      -       -      -
    326B  ARG*     3.5    41.1    +      -       -      +
----------------------------------------------------------
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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