Contacts of the helix formed by residues 132 - 155 (chain H) in PDB entry 1VEQ


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 132 (chain H).
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    121G  ARG*     5.0     1.9    -      -       -      +
    124G  ILE*     4.7    18.8    -      -       +      -
    125G  GLU*     4.7    18.6    -      -       -      +
    128G  GLU*     4.6    20.0    -      -       -      +
    135G  GLN*     4.9     8.5    -      -       -      +
    139G  ILE*     4.4    21.2    -      -       +      +
    127H  LEU      5.0     0.9    -      -       -      -
    128H  GLU*     4.5    29.2    -      -       +      +
    130H  LEU      4.3     0.8    -      -       -      -
    131H  ASP*     1.3    71.8    +      -       -      +
    133H  VAL*     1.3    66.5    +      -       +      +
    135H  GLN*     3.0    39.6    -      -       -      +
    136H  ASP*     3.1    10.4    +      -       -      +
----------------------------------------------------------
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Residues in contact with VAL 133 (chain H). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    121G  ARG*     4.1     7.2    -      -       -      +
    124G  ILE*     5.1     7.2    -      -       +      -
    139G  ILE*     4.1    19.2    -      -       +      +
    142G  ALA*     3.9    22.9    -      -       +      -
    143G  GLY*     3.9    21.3    -      -       -      +
    146G  GLU*     4.0     9.6    -      -       -      +
     71H  ARG*     3.5    30.7    -      -       -      +
    131H  ASP*     3.2     7.8    +      -       -      +
    132H  LEU*     1.3    73.3    -      -       +      +
    134H  SER*     1.3    55.8    +      -       -      +
    135H  GLN      2.6    14.8    +      -       -      -
    136H  ASP*     3.2    12.8    +      -       -      +
    137H  LEU*     3.2    15.6    +      -       +      +
----------------------------------------------------------
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Residues in contact with SER 134 (chain H). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     17H  VAL*     3.9    25.6    -      -       -      +
     21H  LEU*     4.9     7.7    -      -       -      +
     71H  ARG*     3.0    25.7    +      -       -      +
     75H  LEU*     4.8     1.6    -      -       -      +
    127H  LEU*     3.2    19.3    -      -       -      +
    131H  ASP*     2.5    35.2    +      -       -      -
    132H  LEU      3.5     0.4    -      -       -      -
    133H  VAL*     1.3    71.8    -      -       -      +
    135H  GLN*     1.3    57.8    +      -       -      +
    137H  LEU*     4.1    10.9    -      -       -      +
    138H  LEU*     3.7    16.5    +      -       -      +
----------------------------------------------------------
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Residues in contact with GLN 135 (chain H). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    124H  ILE*     3.5    35.0    +      -       +      +
    125H  GLU*     5.1     0.2    -      -       -      +
    127H  LEU*     4.2     9.4    -      -       +      -
    128H  GLU*     3.3    45.9    +      -       -      +
    131H  ASP      3.4    10.2    +      -       -      +
    132H  LEU*     3.0    28.5    +      -       -      +
    133H  VAL      2.6     7.1    +      -       -      -
    134H  SER*     1.3    74.0    -      -       -      +
    136H  ASP*     1.3    65.4    +      -       -      +
    137H  LEU      2.7     6.0    +      -       -      -
    138H  LEU*     2.7    13.1    +      -       -      +
    139H  ILE*     2.8    24.6    +      -       +      +
    132I  LEU*     4.9     8.1    -      -       -      +
----------------------------------------------------------
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Residues in contact with ASP 136 (chain H). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    136G  ASP*     2.5    18.7    -      -       -      +
    139G  ILE*     4.1    24.2    -      -       +      +
    140G  ALA*     5.4     5.9    -      -       -      +
    132H  LEU      3.1     5.7    +      -       -      +
    133H  VAL      3.2     5.4    +      -       -      +
    135H  GLN*     1.3    77.8    +      -       -      +
    137H  LEU*     1.3    62.3    +      -       -      +
    139H  ILE*     3.6    12.1    -      -       -      +
    140H  ALA*     3.1    24.6    +      -       -      +
    136I  ASP*     2.4    38.2    -      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 137 (chain H). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     21H  LEU*     6.1     0.7    -      -       +      -
     67H  GLU*     4.6    28.3    -      -       +      +
     68H  VAL*     4.5     8.5    -      -       +      -
     71H  ARG*     4.7    21.8    -      -       +      -
    133H  VAL*     3.2    18.4    +      -       +      +
    134H  SER*     4.1     7.6    -      -       -      +
    135H  GLN      2.7     0.8    +      -       -      -
    136H  ASP*     1.3    81.7    -      -       -      +
    138H  LEU*     1.3    77.6    +      -       +      +
    139H  ILE      3.2     0.2    +      -       -      -
    140H  ALA*     3.3     7.2    +      -       -      +
    141H  HIS*     3.0    52.0    -      -       +      +
----------------------------------------------------------
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Residues in contact with LEU 138 (chain H). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     21H  LEU*     4.0    22.0    -      -       +      -
     24H  GLN*     3.1    42.8    -      -       +      +
     28H  TYR*     3.9     5.4    -      -       -      +
     68H  VAL*     4.9     2.7    -      -       +      -
    120H  THR*     3.7    20.2    -      -       +      +
    123H  SER*     5.1     5.4    -      -       -      -
    124H  ILE*     4.1    14.6    -      -       +      -
    127H  LEU*     4.5    11.2    -      -       +      -
    134H  SER      3.7    14.1    +      -       -      +
    135H  GLN      2.7    11.0    +      -       -      +
    137H  LEU*     1.3    94.1    -      -       +      +
    139H  ILE*     1.3    64.3    +      -       -      +
    141H  HIS*     3.3    11.0    +      -       +      +
    142H  ALA*     3.2    15.4    +      -       -      +
----------------------------------------------------------
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Residues in contact with ILE 139 (chain H). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    124H  ILE*     3.9    28.2    -      -       +      +
    135H  GLN*     2.8    37.7    +      -       +      +
    136H  ASP*     3.6    14.8    -      -       -      +
    138H  LEU*     1.3    70.4    -      -       -      +
    140H  ALA*     1.3    70.6    +      -       -      +
    142H  ALA*     2.6    23.9    +      -       -      +
    143H  GLY      3.2     3.3    +      -       -      -
    132I  LEU*     4.4    27.6    -      -       +      +
    133I  VAL*     4.1    22.9    -      -       +      +
    136I  ASP*     4.0    27.1    -      -       +      -
----------------------------------------------------------
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Residues in contact with ALA 140 (chain H). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     64H  TYR*     4.5     5.0    +      -       +      -
    136H  ASP*     3.1    12.4    +      -       -      +
    137H  LEU*     3.5    11.9    -      -       -      +
    139H  ILE*     1.3    82.5    -      -       -      +
    141H  HIS*     1.3    69.0    +      -       +      +
    143H  GLY*     3.0    14.3    +      -       -      +
    144H  GLU*     3.6     5.5    +      -       -      +
    136I  ASP*     5.3     7.0    -      -       -      +
----------------------------------------------------------
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Residues in contact with HIS 141 (chain H). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     28H  TYR*     2.7    32.1    +      +       -      +
     64H  TYR*     3.3    45.9    -      +       +      -
     67H  GLU*     3.0    21.8    +      -       +      -
     68H  VAL*     4.0     7.4    -      -       +      -
    120H  THR*     5.8     0.7    -      -       +      -
    137H  LEU*     3.0    39.3    -      -       +      +
    138H  LEU*     3.4     9.9    -      -       +      +
    139H  ILE      2.9     2.2    +      -       -      -
    140H  ALA*     1.3    75.5    -      -       +      +
    142H  ALA*     1.3    64.4    -      -       -      +
    144H  GLU*     2.9     5.9    +      -       -      +
    145H  LEU*     2.8    40.7    +      -       +      +
----------------------------------------------------------
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Residues in contact with ALA 142 (chain H). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    117H  ILE*     5.6     2.7    -      -       +      -
    120H  THR*     4.4    17.2    -      -       +      +
    121H  ARG*     5.4     1.3    -      -       -      +
    124H  ILE*     4.5     4.0    -      -       +      -
    138H  LEU      3.2     6.7    +      -       -      +
    139H  ILE*     2.6    20.3    +      -       -      +
    141H  HIS*     1.3    73.1    -      -       -      +
    143H  GLY*     1.3    54.7    +      -       -      +
    145H  LEU*     4.1     7.8    -      -       -      +
    146H  GLU*     2.7    57.2    +      -       -      +
    133I  VAL*     3.9    13.5    -      -       +      -
----------------------------------------------------------
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Residues in contact with GLY 143 (chain H). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    139H  ILE      3.2     2.8    +      -       -      -
    140H  ALA*     3.0    10.9    +      -       -      -
    142H  ALA*     1.3    78.1    -      -       -      +
    144H  GLU*     1.3    58.4    +      -       -      +
    146H  GLU*     4.2     1.7    -      -       -      +
    147H  LYS*     3.2    26.2    +      -       -      +
     71I  ARG*     4.3     8.1    +      -       -      -
    133I  VAL*     3.9    21.5    -      -       -      +
----------------------------------------------------------
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Residues in contact with GLU 144 (chain H). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     57H  GLN*     4.7     4.3    -      -       -      +
     60H  LEU*     3.5    28.6    -      -       +      +
     64H  TYR*     3.4    23.3    +      -       +      +
    140H  ALA      3.6     5.9    +      -       -      +
    141H  HIS      2.9     2.6    +      -       -      -
    143H  GLY*     1.3    75.4    -      -       -      +
    145H  LEU*     1.3    69.0    +      -       -      +
    147H  LYS*     3.5    21.1    +      -       +      +
    148H  PHE*     2.8    27.0    +      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 145 (chain H). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     28H  TYR*     4.6    10.8    -      -       +      +
     31H  LEU*     4.0    17.9    -      -       +      -
     57H  GLN*     3.5    22.0    -      -       -      +
     61H  VAL*     4.5     3.6    -      -       +      -
     64H  TYR*     4.0    15.7    -      -       +      -
    113H  TYR*     3.5    25.4    -      -       +      -
    116H  VAL*     4.7    14.6    -      -       +      -
    117H  ILE*     4.6    12.6    -      -       +      -
    120H  THR*     5.7     4.0    -      -       +      +
    141H  HIS*     2.8    51.6    +      -       +      +
    142H  ALA*     3.6     7.4    -      -       -      +
    144H  GLU*     1.3    76.0    -      -       -      +
    146H  GLU*     1.3    64.4    +      -       -      +
    148H  PHE*     3.2     2.6    +      -       -      +
    149H  GLN      3.0    16.5    +      -       -      -
----------------------------------------------------------
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Residues in contact with GLU 146 (chain H). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    117H  ILE*     3.5    33.2    -      -       +      +
    121H  ARG*     3.0    34.4    +      -       -      -
    142H  ALA*     2.7    37.1    +      -       -      +
    145H  LEU*     1.3    74.2    -      -       -      +
    147H  LYS*     1.3    62.9    +      -       -      +
    149H  GLN*     3.2     7.6    -      -       -      +
    150H  TRP      3.1    15.8    +      -       -      -
      6I  ILE*     3.4    17.3    -      -       +      +
     71I  ARG*     3.0    36.6    +      -       -      +
     74I  THR*     3.5    14.4    -      -       +      +
    133I  VAL*     3.9     1.1    -      -       -      +
----------------------------------------------------------
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Residues in contact with LYS 147 (chain H). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    143H  GLY      3.2    19.7    +      -       -      +
    144H  GLU*     3.5    24.1    +      -       +      +
    145H  LEU      3.2     0.4    -      -       -      -
    146H  GLU*     1.3    75.1    -      -       -      +
    148H  PHE*     1.3    67.4    +      -       -      +
    150H  TRP*     2.7    31.0    +      -       +      +
    151H  PHE*     3.2    26.6    +      -       +      -
     66I  ASP      5.1     0.2    +      -       -      -
     67I  GLU*     5.1    10.9    +      -       -      +
     70I  GLU*     2.8    46.4    +      -       -      +
     71I  ARG*     5.8     1.3    -      -       -      +
     74I  THR*     4.1    19.0    -      -       -      +
----------------------------------------------------------
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Residues in contact with PHE 148 (chain H). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     35H  LEU*     4.1    11.7    -      -       +      -
     53H  MET*     4.0    32.1    -      -       +      -
     54H  ILE*     4.7     5.8    -      -       +      -
     57H  GLN*     3.0    50.5    -      -       +      +
    109H  LEU*     4.3     7.9    -      -       +      -
    113H  TYR*     3.4    39.3    -      +       -      -
    144H  GLU      2.8    15.2    +      -       -      +
    145H  LEU      3.6     2.2    -      -       -      +
    147H  LYS*     1.3    74.1    -      -       -      +
    149H  GLN*     1.3    65.4    +      -       -      +
    151H  PHE*     2.8    39.9    +      +       +      +
    152H  VAL*     3.0    28.3    +      -       +      -
----------------------------------------------------------
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Residues in contact with GLN 149 (chain H). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    110H  ASP*     3.5    15.7    +      -       -      +
    113H  TYR*     3.5    21.1    -      -       +      +
    114H  ASN*     2.9    32.1    +      -       -      +
    117H  ILE*     3.4    21.8    -      -       +      +
    145H  LEU      3.0    12.0    +      -       -      +
    146H  GLU*     3.2    11.9    -      -       -      +
    147H  LYS      3.1     0.2    +      -       -      -
    148H  PHE*     1.3    78.9    -      -       -      +
    150H  TRP*     1.3    66.2    +      -       -      +
    152H  VAL*     2.8    14.6    +      -       +      +
    153H  ARG*     2.8    58.2    +      -       +      +
      6I  ILE*     5.0     3.1    -      -       -      +
      7I  PRO*     3.9     5.9    -      -       -      +
     74I  THR*     5.9     0.9    -      -       -      +
----------------------------------------------------------
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Residues in contact with TRP 150 (chain H). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     39C  HIS      5.0     0.2    -      -       -      -
     40C  TRP*     3.7    19.1    -      -       -      -
     42C  VAL      5.2     1.6    -      -       -      -
     43C  VAL*     5.7     3.1    -      -       +      +
     47C  PHE*     4.2    16.8    -      +       -      -
     51C  HIS*     4.5     9.4    -      +       -      -
     99C  ARG*     4.8     4.0    -      -       -      +
    146H  GLU      3.1     2.0    +      -       -      -
    147H  LYS*     2.7    22.5    +      -       +      +
    149H  GLN*     1.3    79.3    -      -       -      +
    151H  PHE*     1.3    84.7    +      +       -      -
    153H  ARG*     2.9    10.1    +      -       -      +
    154H  ALA*     2.6    47.4    +      -       +      +
    157H  GLU*     5.5     1.2    +      -       -      -
      4I  PHE*     4.3    16.3    -      +       -      -
     70I  GLU*     4.3    33.4    -      -       +      -
     73I  ALA*     3.5    46.6    +      -       +      +
     74I  THR*     3.7    28.0    -      -       +      +
----------------------------------------------------------
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Residues in contact with PHE 151 (chain H). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     47C  PHE*     3.3    22.2    -      +       +      -
     48C  ILE*     4.2     9.6    -      -       +      -
     51C  HIS*     3.7    33.7    -      +       -      -
     53H  MET*     4.1    21.3    -      -       +      -
    147H  LYS*     3.2    30.5    +      -       +      -
    148H  PHE*     2.8    40.9    +      +       +      +
    150H  TRP*     1.3    90.1    -      +       -      +
    152H  VAL*     1.3    65.2    +      -       -      +
    154H  ALA*     3.4     5.2    +      -       -      +
    155H  HIS*     2.8    23.3    +      -       -      -
     70I  GLU*     5.1     1.6    -      -       -      -
----------------------------------------------------------
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Residues in contact with VAL 152 (chain H). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     53H  MET*     4.7     2.0    -      -       +      -
    106H  LEU*     3.1    57.3    -      -       +      +
    109H  LEU*     4.3     7.6    -      -       +      -
    110H  ASP*     4.2    13.7    -      -       +      +
    113H  TYR*     5.5     2.2    -      -       +      -
    148H  PHE*     3.3    44.6    -      -       +      +
    149H  GLN*     2.8    15.6    +      -       +      +
    151H  PHE*     1.3    76.6    -      -       -      +
    153H  ARG*     1.3    63.2    +      -       +      +
    155H  HIS*     3.0    20.3    +      -       -      +
    156H  LEU*     3.9     5.5    -      -       +      +
----------------------------------------------------------
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Residues in contact with ARG 153 (chain H). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    110H  ASP*     2.8    32.4    +      -       +      +
    114H  ASN*     3.1    31.1    +      -       -      +
    149H  GLN*     2.8    43.5    +      -       +      +
    150H  TRP*     2.9    10.5    +      -       -      +
    152H  VAL*     1.3    69.1    -      -       -      +
    154H  ALA*     1.3    53.0    +      -       -      +
    155H  HIS      2.7     5.5    +      -       -      -
    156H  LEU*     2.6    40.0    +      -       +      +
    157H  GLU*     3.5     9.3    +      -       -      +
      4I  PHE*     3.6    50.0    -      -       +      +
      5I  THR      3.5    23.8    +      -       -      +
      6I  ILE*     4.4     0.6    -      -       -      +
      7I  PRO*     4.0     7.3    -      -       -      +
     74I  THR      5.1     2.2    +      -       -      -
----------------------------------------------------------
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Residues in contact with ALA 154 (chain H). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     42C  VAL      4.6     0.2    -      -       -      +
     43C  VAL*     3.7    24.2    -      -       +      +
     44C  GLY      3.0    26.2    +      -       -      +
     47C  PHE*     3.8    34.1    -      -       +      -
    150H  TRP*     2.6    31.6    +      -       +      +
    151H  PHE      3.4     0.2    +      -       -      -
    153H  ARG*     1.3    71.1    -      -       -      +
    155H  HIS*     1.3    57.9    +      -       -      +
    156H  LEU      3.2     1.8    +      -       -      -
    157H  GLU*     4.0    10.3    +      -       -      -
----------------------------------------------------------
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Residues in contact with HIS 155 (chain H). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     44C  GLY      3.0    15.9    -      -       -      +
     45C  PRO*     3.1    35.5    +      -       -      +
     46C  ASN*     4.8     0.6    -      -       -      -
     47C  PHE*     3.2    29.3    +      +       +      -
     48C  ILE*     3.6    30.6    +      -       +      +
     46H  ASN*     4.4     1.3    +      -       -      -
     49H  GLY*     5.5     0.4    -      -       -      -
     50H  VAL*     4.0    16.9    +      -       +      +
     53H  MET*     3.8     9.6    -      -       -      -
    103H  GLN*     4.0    10.3    +      -       -      +
    106H  LEU*     3.5    29.1    -      -       +      +
    151H  PHE      2.8    20.7    +      -       -      -
    152H  VAL*     3.0    11.1    +      -       -      +
    153H  ARG      2.7     3.4    +      -       -      -
    154H  ALA*     1.3    74.6    -      -       -      +
    156H  LEU*     1.3    62.6    +      -       +      +
    157H  GLU      3.8     0.2    -      -       -      -
----------------------------------------------------------
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A short description of the analytical approach
The contact analysis used in this page is based upon the approach developed in: Sobolev V., Wade R.C., Vriend G. and Edelman M. PROTEINS (1996) 25, 120-129. Contact legitimacy depends on the hydrophobic-hydrophilic properties of the contacting atoms. In order to define it, for each inter-atomic contact, eight atom classes have been introduced:


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

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

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