Contacts of the helix formed by residues 118 - 143 (chain H) in PDB entry 1JI4


Residue contacts within the protein are derived with the CSU software (Sobolev V., Sorokine A., Prilusky J., Abola E.E. and Edelman M. (1999) Automated analysis of interatomic contacts in proteins. Bioinformatics, 15, 327-332). A short description of the analytical approach is given at the end of the page.
For CSU analysis of other PDB entry

Note:
Non-standard 3 letter residue codes indicate a heterogroup. To identify and analyse, use LPC software

Legend:
Dist - nearest distance (Å) between atoms of two residues
Surf - contact surface area (Å2) between two residues
HB   - hydrophilic-hydrophilic contact (hydrogen bond)
Arom - aromatic-aromatic contact
Phob - hydrophobic-hydrophobic contact
DC   - hydrophobic-hydrophilic contact (destabilizing contact)
+/-  - indicates presence/absence of a specific contacts
*    - indicates residues forming contacts  by their side chain
       (including CA atoms)
Residues in contact with ASP 118 (chain H).
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
      3H  THR*     4.0     7.3    -      -       -      +
     57H  ARG*     2.9    25.7    +      -       -      -
     61H  LEU*     3.8    17.7    -      -       -      +
    113H  ALA*     2.8    20.4    +      -       +      +
    116H  GLU*     3.3    11.6    -      -       +      +
    117H  GLY*     1.3    73.1    -      -       -      +
    119H  LYS*     1.3    63.8    +      -       -      +
    120H  VAL*     3.7     1.7    +      -       -      +
    121H  THR*     2.6    29.7    +      -       -      -
    122H  VAL*     3.1    23.1    +      -       -      +
----------------------------------------------------------
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Residues in contact with LYS 119 (chain H). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    117H  GLY*     3.0    16.4    +      -       -      +
    118H  ASP*     1.3    70.7    +      -       -      +
    120H  VAL*     1.3    66.0    +      -       +      +
    122H  VAL*     3.3     8.1    +      -       -      +
    123H  THR*     3.2    27.2    +      -       -      +
    107K  LYS*     5.0     9.0    -      -       +      +
    110K  SER*     3.2    28.5    +      -       -      +
    111K  ASN*     3.0    31.7    -      -       -      +
    114K  GLU*     3.2    23.8    +      -       -      -
    122K  VAL*     5.3     0.8    -      -       -      +
    126K  ASP*     4.1    23.1    +      -       -      +
    129K  LEU*     4.9    11.4    -      -       +      -
----------------------------------------------------------
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Residues in contact with VAL 120 (chain H). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     57H  ARG*     3.1    37.9    -      -       -      +
     60H  GLN*     5.2     1.3    -      -       -      +
    118H  ASP*     3.4     1.5    -      -       -      +
    119H  LYS*     1.3    75.2    -      -       +      +
    121H  THR*     1.3    64.8    +      -       -      +
    123H  THR*     3.3     9.6    +      -       -      -
    124H  TYR*     3.1    21.6    +      -       +      +
    126K  ASP      4.7     4.0    -      -       -      +
    129K  LEU*     4.1    19.3    -      -       +      -
    130K  ALA*     4.2    26.0    -      -       +      +
    133K  GLN*     3.2    32.5    -      -       -      +
----------------------------------------------------------
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Residues in contact with THR 121 (chain H). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
      3H  THR*     3.8    10.1    -      -       +      -
      7H  LEU*     4.4     8.3    -      -       +      -
     57H  ARG*     2.9    24.9    +      -       +      +
     61H  LEU*     4.0     2.1    -      -       -      +
    109H  LEU*     3.5    35.0    -      -       +      -
    113H  ALA*     4.0     4.5    -      -       +      -
    118H  ASP*     2.6    35.1    +      -       -      -
    120H  VAL*     1.3    76.3    -      -       -      +
    122H  VAL*     1.3    59.2    +      -       -      +
    124H  TYR*     3.3     7.5    +      -       +      +
    125H  ALA*     2.9    27.2    +      -       -      +
----------------------------------------------------------
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Residues in contact with VAL 122 (chain H). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    119A  LYS*     5.2     0.7    -      -       -      +
    110H  SER*     3.7    15.3    -      -       -      +
    113H  ALA*     3.6     6.7    -      -       +      -
    114H  GLU*     3.4    44.9    -      -       +      +
    118H  ASP      3.1    16.8    +      -       -      +
    119H  LYS*     3.5    10.5    -      -       -      +
    120H  VAL      3.2     0.2    -      -       -      -
    121H  THR*     1.3    79.4    -      -       -      +
    123H  THR*     1.3    61.0    +      -       +      +
    125H  ALA*     3.2     6.0    +      -       -      +
    126H  ASP*     2.9    42.8    +      -       -      +
----------------------------------------------------------
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Residues in contact with THR 123 (chain H). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    123A  THR*     6.5     0.2    -      -       -      -
    119H  LYS      3.2    16.5    +      -       -      +
    120H  VAL*     3.3    11.5    +      -       -      +
    121H  THR      3.4     0.2    -      -       -      -
    122H  VAL*     1.3    76.3    -      -       +      +
    124H  TYR*     1.3    68.5    +      -       -      +
    126H  ASP*     3.4     6.6    +      -       -      +
    127H  ASP*     3.0    37.8    +      -       -      +
    126K  ASP*     4.1    29.8    +      -       +      +
    127K  ASP*     5.1     8.8    +      -       -      +
----------------------------------------------------------
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Residues in contact with TYR 124 (chain H). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
      7H  LEU*     5.4     2.9    -      -       +      -
     50H  MET*     3.6    28.1    +      -       -      +
     53H  ASP*     3.7    34.3    +      -       +      +
     54H  LEU*     3.8    25.4    -      -       +      +
     57H  ARG*     5.8     9.6    -      -       +      -
    106H  PHE*     3.9     6.1    -      +       -      -
    109H  LEU*     4.6     7.0    -      -       +      -
    120H  VAL*     3.1    11.0    +      -       +      +
    121H  THR*     3.5    13.0    -      -       +      +
    122H  VAL      3.2     0.2    -      -       -      -
    123H  THR*     1.3    83.0    +      -       -      +
    125H  ALA*     1.3    65.4    +      -       -      +
    127H  ASP*     3.2     9.1    +      -       +      +
    128H  GLN*     3.1    57.0    +      -       +      +
----------------------------------------------------------
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Residues in contact with ALA 125 (chain H). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    106H  PHE*     3.7    29.4    -      -       +      +
    109H  LEU*     3.5    21.5    -      -       +      -
    110H  SER*     3.8    14.1    -      -       -      +
    121H  THR      2.9    17.0    +      -       -      +
    122H  VAL      3.5     5.2    -      -       -      +
    124H  TYR*     1.3    77.5    -      -       -      +
    126H  ASP*     1.3    56.3    +      -       -      +
    128H  GLN*     3.3     3.8    +      -       -      +
    129H  LEU*     3.0    31.9    +      -       -      +
----------------------------------------------------------
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Residues in contact with ASP 126 (chain H). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    119A  LYS*     3.9    26.9    -      -       +      +
    120A  VAL*     4.6     5.4    -      -       -      +
    123A  THR*     4.0    28.3    +      -       +      +
    110H  SER*     2.6    30.2    +      -       -      -
    122H  VAL*     2.9    29.5    +      -       -      +
    123H  THR*     3.9     7.0    -      -       -      +
    125H  ALA*     1.3    76.3    -      -       -      +
    127H  ASP*     1.3    63.2    +      -       -      +
    129H  LEU*     3.4     9.4    -      -       -      +
    130H  ALA*     3.1    21.1    +      -       -      +
----------------------------------------------------------
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Residues in contact with ASP 127 (chain H). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    123A  THR*     5.0     9.7    +      -       -      +
    123H  THR*     3.0    33.0    +      -       -      +
    124H  TYR*     3.2     7.9    +      -       +      +
    126H  ASP*     1.3    76.3    -      -       -      +
    128H  GLN*     1.3    76.5    +      -       -      +
    130H  ALA*     3.3     9.5    +      -       -      +
    131H  LYS*     3.3    27.2    +      -       -      +
----------------------------------------------------------
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Residues in contact with GLN 128 (chain H). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     50H  MET*     4.7    11.6    -      -       -      +
     53H  ASP*     5.7     0.4    +      -       -      -
    106H  PHE*     3.6    36.8    -      -       +      -
    124H  TYR*     3.1    50.3    +      -       +      +
    125H  ALA      3.7     6.1    -      -       -      +
    127H  ASP*     1.3    82.4    -      -       -      +
    129H  LEU*     1.3    60.4    +      -       -      +
    131H  LYS*     3.2    30.6    +      -       -      +
    132H  LEU*     2.9    35.4    +      -       +      +
    707H  MPD      4.6     8.7    +      -       +      +
----------------------------------------------------------
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Residues in contact with LEU 129 (chain H). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    119A  LYS*     4.7    10.5    -      -       +      -
    120A  VAL*     4.0    11.4    -      -       +      -
    103H  GLU*     3.5    42.4    -      -       +      +
    106H  PHE*     3.6    30.5    -      -       +      +
    107H  LYS*     4.1    15.0    -      -       +      -
    110H  SER*     4.6     2.2    -      -       -      -
    125H  ALA      3.0    17.5    +      -       -      +
    126H  ASP*     3.4    24.9    -      -       -      +
    127H  ASP      3.2     0.2    -      -       -      -
    128H  GLN*     1.3    77.0    -      -       -      +
    130H  ALA*     1.3    56.8    +      -       -      +
    132H  LEU*     3.3     3.6    +      -       +      +
    133H  GLN*     2.9    46.5    +      -       -      +
----------------------------------------------------------
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Residues in contact with ALA 130 (chain H). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     60A  GLN*     5.0     2.4    +      -       -      -
    120A  VAL*     4.0    26.3    -      -       +      +
    123A  THR*     5.4     4.3    -      -       -      +
    126H  ASP      3.1    10.5    +      -       -      +
    127H  ASP*     3.4    12.6    -      -       -      +
    128H  GLN      3.2     0.2    -      -       -      -
    129H  LEU*     1.3    80.9    -      -       -      +
    131H  LYS*     1.3    61.2    +      -       +      +
    133H  GLN*     3.5     2.3    +      -       -      +
    134H  LYS*     3.2    23.0    +      -       -      +
----------------------------------------------------------
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Residues in contact with LYS 131 (chain H). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     46H  GLU*     3.7    20.0    +      -       -      +
    127H  ASP*     3.3    13.9    +      -       -      +
    128H  GLN*     3.2    34.9    +      -       -      +
    130H  ALA*     1.3    76.7    -      -       +      +
    132H  LEU*     1.3    62.8    +      -       -      +
    134H  LYS*     3.4     6.2    +      -       -      +
    135H  SER*     3.1    27.4    +      -       -      -
    707H  MPD      3.9    35.7    -      -       +      +
----------------------------------------------------------
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Residues in contact with LEU 132 (chain H). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     99H  TYR*     4.0    32.3    -      -       +      +
    102H  LEU*     4.0    11.0    -      -       +      -
    103H  GLU*     3.9    23.8    -      -       +      +
    106H  PHE*     3.6    34.1    -      -       +      -
    128H  GLN*     2.9    21.6    +      -       +      +
    129H  LEU*     3.7     5.8    -      -       -      +
    131H  LYS*     1.3    77.2    -      -       -      +
    133H  GLN*     1.3    57.4    +      -       +      +
    135H  SER*     3.3     4.8    +      -       -      -
    136H  ILE*     2.9    41.1    +      -       +      +
    707H  MPD      3.4    29.6    -      -       +      -
----------------------------------------------------------
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Residues in contact with GLN 133 (chain H). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     57A  ARG*     2.9    42.6    +      -       -      +
     60A  GLN*     4.0     8.1    -      -       +      +
     61A  LEU*     5.3     0.3    -      -       -      +
    118A  ASP*     5.7     0.2    +      -       -      -
    120A  VAL*     3.2    22.3    -      -       -      +
    103H  GLU*     3.1    31.1    +      -       +      +
    107H  LYS*     4.0    16.8    -      -       -      +
    129H  LEU*     2.9    22.4    +      -       -      +
    130H  ALA*     4.0     4.0    -      -       -      +
    131H  LYS      3.3     0.2    -      -       -      -
    132H  LEU*     1.3    76.9    -      -       -      +
    134H  LYS*     1.3    61.4    +      -       -      +
    136H  ILE*     3.9     6.5    -      -       +      +
    137H  TRP*     3.3    21.3    +      -       -      +
----------------------------------------------------------
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Residues in contact with LYS 134 (chain H). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     53A  ASP*     5.3     5.1    +      -       -      -
     56A  GLU*     4.0    17.4    +      -       -      -
     60A  GLN*     3.8    22.8    -      -       -      +
     37D  HIS*     5.8     0.2    -      -       -      -
    808D  UNX      3.7    19.5    -      -       -      -
    130H  ALA      3.2    16.6    +      -       -      +
    131H  LYS*     3.8     6.1    -      -       -      +
    132H  LEU      3.3     0.2    -      -       -      -
    133H  GLN*     1.3    77.2    -      -       -      +
    135H  SER*     1.3    62.2    +      -       -      +
    137H  TRP*     3.3    16.9    +      -       +      +
    138H  MET*     3.2    41.3    +      -       +      +
----------------------------------------------------------
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Residues in contact with SER 135 (chain H). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     99H  TYR*     3.5    26.5    -      -       -      -
    131H  LYS      3.1    15.5    +      -       -      -
    132H  LEU      3.8     2.5    -      -       -      -
    134H  LYS*     1.3    75.3    -      -       -      +
    136H  ILE*     1.3    60.0    +      -       -      +
    138H  MET*     3.2    19.6    +      -       -      +
    139H  LEU*     2.8    36.2    +      -       -      +
    707H  MPD      2.6    24.1    +      -       -      +
----------------------------------------------------------
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Residues in contact with ILE 136 (chain H). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     96H  LEU*     4.1     9.0    -      -       +      -
     99H  TYR*     3.9    39.5    -      -       +      +
    100H  LYS*     4.0    14.4    -      -       +      +
    103H  GLU*     3.6    30.7    -      -       +      +
    132H  LEU*     2.9    27.3    +      -       +      +
    133H  GLN*     3.9     7.0    -      -       +      +
    134H  LYS      3.3     0.2    -      -       -      -
    135H  SER*     1.3    76.2    -      -       -      +
    137H  TRP*     1.3    63.4    +      -       -      +
    139H  LEU*     3.6     6.8    -      -       -      +
    140H  GLN*     2.9    48.0    +      -       -      +
----------------------------------------------------------
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Residues in contact with TRP 137 (chain H). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     56A  GLU*     3.7    43.7    -      -       +      -
     59A  VAL*     3.4    30.8    -      -       +      +
     60A  GLN*     3.7    31.6    -      -       +      -
     26D  TRP*     3.7    26.9    +      -       -      -
     29D  LYS*     5.0     5.2    -      -       -      +
     33D  PHE*     4.1    15.3    -      +       -      -
     37D  HIS*     3.8    15.0    -      +       -      -
    133H  GLN      3.3    10.8    +      -       -      +
    134H  LYS*     3.4    26.9    -      -       +      +
    135H  SER      3.2     0.6    -      -       -      -
    136H  ILE*     1.3    80.8    -      -       -      +
    138H  MET*     1.3    67.3    +      -       +      +
    140H  GLN*     3.2    11.6    +      -       -      +
    141H  ALA*     2.8    39.5    +      -       +      +
----------------------------------------------------------
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Residues in contact with MET 138 (chain H). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     33D  PHE*     3.6    38.8    -      -       +      -
     34D  PHE*     6.6     0.4    -      -       -      -
     37D  HIS*     4.8    11.7    -      -       -      -
    134H  LYS*     3.2    38.0    +      -       +      +
    135H  SER*     3.2    20.6    +      -       -      +
    137H  TRP*     1.3    94.0    -      -       +      +
    139H  LEU*     1.3    63.3    -      -       +      +
    141H  ALA*     3.4     2.1    +      -       -      +
    142H  HIS*     3.0    24.8    +      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 139 (chain H). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     43H  ILE*     6.2     2.9    -      -       +      -
     92H  PHE*     3.7    48.9    -      -       +      +
     95H  ILE*     4.1    12.3    -      -       +      -
     96H  LEU*     3.9    19.3    -      -       +      +
     99H  TYR*     3.6    33.9    -      -       +      -
    135H  SER*     2.8    28.0    +      -       -      +
    136H  ILE*     3.6     5.8    -      -       -      +
    138H  MET*     1.3    72.1    -      -       +      +
    140H  GLN*     1.3    63.3    +      -       -      +
    142H  HIS*     3.3     8.4    +      -       +      +
    143H  LEU*     3.1    28.6    +      -       -      +
----------------------------------------------------------
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Residues in contact with GLN 140 (chain H). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     96H  LEU*     3.9    19.7    -      -       +      -
    100H  LYS*     3.0    32.4    +      -       -      -
    136H  ILE*     2.9    29.3    +      -       -      +
    137H  TRP*     3.6    10.2    -      -       -      +
    139H  LEU*     1.3    75.8    -      -       -      +
    141H  ALA*     1.3    65.1    +      -       -      +
    143H  LEU*     3.3     8.1    +      -       -      +
    144H  ALA*     3.2    22.4    +      -       -      +
----------------------------------------------------------
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Residues in contact with ALA 141 (chain H). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     28D  VAL      3.6     9.2    -      -       -      +
     29D  LYS*     3.2    23.9    -      -       -      +
     30D  GLY      2.8    29.1    +      -       -      -
     33D  PHE*     3.5    31.4    -      -       +      -
    137H  TRP*     2.8    23.7    +      -       +      +
    138H  MET      3.7     1.1    -      -       -      +
    140H  GLN*     1.3    75.6    -      -       -      +
    142H  HIS*     1.3    54.8    +      -       -      +
    144H  ALA*     3.2     8.4    +      -       -      +
----------------------------------------------------------
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Residues in contact with HIS 142 (chain H). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     30D  GLY*     2.9    31.5    +      -       -      +
     31D  THR*     3.1    53.3    +      -       +      +
     33D  PHE*     4.0    12.5    +      -       +      +
     34D  PHE*     5.1     4.0    +      -       -      +
     32H  ASP*     4.6     3.6    -      -       -      -
     88H  SER*     3.8     5.4    +      -       -      -
     89H  LYS*     5.6     0.6    +      -       -      -
     92H  PHE*     3.1    48.0    -      +       -      -
    138H  MET      3.0    14.4    +      -       -      +
    139H  LEU*     3.3    13.2    -      -       +      +
    140H  GLN      3.2     0.2    -      -       -      -
    141H  ALA*     1.3    78.0    -      -       -      +
    143H  LEU*     1.3    69.1    +      -       +      +
    144H  ALA*     3.2     2.5    +      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 143 (chain H). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     31D  THR*     5.8     2.0    -      -       +      -
     89H  LYS*     3.9    36.8    -      -       +      +
     92H  PHE*     4.0    31.6    -      -       +      +
     93H  LYS*     4.2    17.5    -      -       +      -
     96H  LEU*     4.0    21.5    -      -       +      -
    139H  LEU      3.1    19.8    +      -       -      +
    140H  GLN*     3.3     6.4    +      -       -      +
    142H  HIS*     1.3    84.4    -      -       +      +
    144H  ALA*     1.3    58.5    +      -       -      +
----------------------------------------------------------
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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