Contacts of the helix formed by residues 132 - 155 (chain E) 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 E).
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    121D  ARG*     4.9     2.5    -      -       -      +
    124D  ILE*     4.7    17.7    -      -       +      -
    125D  GLU*     4.7    21.5    -      -       +      +
    128D  GLU*     4.8    16.8    -      -       -      +
    135D  GLN*     5.1     7.9    -      -       -      +
    139D  ILE*     4.5    20.2    -      -       +      +
    127E  LEU      5.0     0.7    -      -       -      -
    128E  GLU*     4.5    27.6    -      -       +      +
    130E  LEU      4.3     0.6    -      -       -      -
    131E  ASP*     1.3    71.2    +      -       -      +
    133E  VAL*     1.3    66.1    +      -       +      +
    135E  GLN*     3.1    39.8    +      -       -      +
    136E  ASP*     3.1    10.0    +      -       -      +
----------------------------------------------------------
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Residues in contact with VAL 133 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    121D  ARG*     3.9     9.2    -      -       -      +
    124D  ILE*     5.2     5.2    -      -       +      -
    139D  ILE*     4.2    17.5    -      -       +      -
    142D  ALA*     4.0    14.1    -      -       +      -
    143D  GLY*     4.0    21.1    -      -       -      +
    146D  GLU*     3.9    18.4    -      -       -      +
     71E  ARG*     3.5    31.0    -      -       -      +
    131E  ASP*     3.2     9.6    +      -       -      +
    132E  LEU*     1.3    73.0    -      -       +      +
    134E  SER*     1.3    56.7    +      -       -      +
    135E  GLN      2.6    15.5    +      -       -      -
    136E  ASP*     3.2    12.3    +      -       -      +
    137E  LEU*     3.2    15.0    +      -       +      +
----------------------------------------------------------
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Residues in contact with SER 134 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     17E  VAL*     3.9    26.2    -      -       -      +
     21E  LEU*     4.9     7.3    -      -       -      +
     71E  ARG*     3.0    26.6    +      -       -      +
     75E  LEU*     4.8     1.4    -      -       -      +
    127E  LEU*     3.2    19.2    -      -       -      +
    131E  ASP*     2.5    34.7    +      -       -      -
    132E  LEU      3.5     0.4    -      -       -      -
    133E  VAL*     1.3    70.9    -      -       -      +
    135E  GLN*     1.3    57.2    +      -       -      +
    137E  LEU*     4.0    11.1    -      -       -      +
    138E  LEU*     3.7    16.6    +      -       -      +
----------------------------------------------------------
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Residues in contact with GLN 135 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    124E  ILE*     3.5    37.4    +      -       +      +
    127E  LEU*     4.2     9.4    -      -       +      -
    128E  GLU*     3.3    46.8    +      -       -      +
    131E  ASP      3.4    10.0    +      -       -      +
    132E  LEU*     3.1    28.8    +      -       -      +
    133E  VAL      2.6     7.1    +      -       -      -
    134E  SER*     1.3    74.0    -      -       -      +
    136E  ASP*     1.3    64.4    +      -       -      +
    137E  LEU      2.7     5.8    +      -       -      -
    138E  LEU*     2.7    14.0    +      -       -      +
    139E  ILE*     2.8    23.8    +      -       +      +
    132F  LEU*     4.8     8.6    -      -       -      +
----------------------------------------------------------
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Residues in contact with ASP 136 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    136D  ASP*     2.6    17.3    -      -       -      +
    139D  ILE*     4.1    25.7    -      -       +      +
    140D  ALA*     5.4     6.1    -      -       -      +
    132E  LEU      3.1     5.8    +      -       -      +
    133E  VAL      3.2     5.8    +      -       -      +
    135E  GLN*     1.3    78.4    +      -       -      +
    137E  LEU*     1.3    63.8    +      -       -      +
    139E  ILE*     3.6    11.5    -      -       -      +
    140E  ALA*     3.1    23.7    +      -       -      +
    136F  ASP*     2.5    37.1    -      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 137 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     67E  GLU*     4.6    27.6    -      -       +      +
     68E  VAL*     4.4     9.2    -      -       +      -
     71E  ARG*     4.7    21.5    -      -       +      +
    133E  VAL*     3.2    17.4    +      -       +      +
    134E  SER*     4.0     8.5    -      -       -      +
    135E  GLN      2.7     0.4    +      -       -      -
    136E  ASP*     1.3    83.8    -      -       -      +
    138E  LEU*     1.3    79.5    +      -       +      +
    140E  ALA*     3.3     7.3    +      -       -      +
    141E  HIS*     3.1    51.3    -      -       +      +
----------------------------------------------------------
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Residues in contact with LEU 138 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     21E  LEU*     4.0    22.4    -      -       +      -
     24E  GLN*     3.1    42.4    -      -       +      +
     28E  TYR*     3.9     6.5    -      -       -      +
     68E  VAL*     4.9     3.1    -      -       +      -
    120E  THR*     3.7    18.6    -      -       +      +
    123E  SER*     5.1     5.6    -      -       -      -
    124E  ILE*     4.1    17.0    -      -       +      +
    127E  LEU*     4.5    11.0    -      -       +      -
    134E  SER      3.7    13.9    +      -       -      +
    135E  GLN      2.7    10.8    +      -       -      +
    137E  LEU*     1.3    93.0    -      -       +      +
    139E  ILE*     1.3    64.4    +      -       -      +
    141E  HIS*     3.3    10.7    +      -       +      +
    142E  ALA*     3.2    15.1    +      -       -      +
----------------------------------------------------------
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Residues in contact with ILE 139 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    124E  ILE*     3.9    29.1    -      -       +      +
    135E  GLN*     2.8    36.4    +      -       +      +
    136E  ASP*     3.6    14.6    -      -       -      +
    138E  LEU*     1.3    70.8    -      -       -      +
    140E  ALA*     1.3    70.8    +      -       -      +
    142E  ALA*     2.6    23.4    +      -       -      +
    143E  GLY      3.2     2.4    +      -       -      -
    132F  LEU*     4.3    28.3    -      -       +      +
    133F  VAL*     4.1    22.7    -      -       +      +
    136F  ASP*     4.0    26.2    -      -       +      -
----------------------------------------------------------
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Residues in contact with ALA 140 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     64E  TYR*     4.6     4.2    +      -       +      -
    136E  ASP*     3.1    11.8    +      -       -      +
    137E  LEU*     3.4    11.2    -      -       -      +
    139E  ILE*     1.3    81.1    -      -       -      +
    141E  HIS*     1.3    69.7    +      -       +      +
    143E  GLY*     3.0    16.6    +      -       -      +
    144E  GLU*     3.6     5.7    +      -       -      +
    136F  ASP*     5.3     7.6    +      -       -      +
----------------------------------------------------------
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Residues in contact with HIS 141 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     28E  TYR*     2.7    30.5    +      +       -      +
     64E  TYR*     3.1    49.8    -      +       +      -
     67E  GLU*     3.0    20.6    +      -       -      -
     68E  VAL*     3.9     6.5    -      -       +      -
    120E  THR*     5.8     0.9    -      -       +      -
    137E  LEU*     3.1    40.4    -      -       +      +
    138E  LEU*     3.5     8.2    -      -       +      +
    139E  ILE      2.8     2.2    +      -       -      -
    140E  ALA*     1.3    75.9    -      -       +      +
    142E  ALA*     1.3    65.8    +      -       -      +
    144E  GLU*     2.9     5.0    +      -       -      +
    145E  LEU*     2.7    41.1    +      -       +      +
----------------------------------------------------------
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Residues in contact with ALA 142 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    117E  ILE*     5.7     2.5    -      -       +      -
    120E  THR*     4.4    16.7    -      -       +      +
    121E  ARG*     5.4     1.6    -      -       -      +
    124E  ILE*     4.4     4.0    -      -       +      -
    138E  LEU      3.2     6.7    +      -       -      +
    139E  ILE*     2.6    20.5    +      -       -      +
    141E  HIS*     1.3    73.3    -      -       -      +
    143E  GLY*     1.3    54.8    +      -       -      +
    145E  LEU*     4.1     7.9    -      -       -      -
    146E  GLU*     2.7    57.8    +      -       +      +
    133F  VAL*     3.8    13.5    -      -       +      -
----------------------------------------------------------
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Residues in contact with GLY 143 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    139E  ILE      3.2     3.0    +      -       -      -
    140E  ALA      3.0    10.8    +      -       -      -
    142E  ALA*     1.3    79.1    -      -       -      +
    144E  GLU*     1.3    59.4    +      -       -      +
    146E  GLU*     4.1     1.6    -      -       -      +
    147E  LYS*     3.2    25.8    +      -       -      +
     71F  ARG*     4.3     8.6    +      -       -      -
    133F  VAL*     3.9    20.7    -      -       -      +
----------------------------------------------------------
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Residues in contact with GLU 144 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     57E  GLN*     4.2     4.7    -      -       -      +
     60E  LEU*     3.5    27.9    -      -       +      +
     64E  TYR*     3.4    24.0    +      -       +      +
    140E  ALA      3.6     5.2    +      -       -      +
    141E  HIS      2.9     2.6    +      -       -      +
    143E  GLY*     1.3    74.8    -      -       -      +
    145E  LEU*     1.3    66.9    +      -       -      +
    147E  LYS*     3.6    21.4    +      -       +      +
    148E  PHE*     2.8    26.9    +      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 145 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     28E  TYR*     4.6    10.1    -      -       +      +
     31E  LEU*     4.0    18.2    -      -       +      -
     57E  GLN*     3.5    14.6    -      -       -      +
     61E  VAL*     4.6     3.6    -      -       +      -
     64E  TYR*     4.1    15.7    -      -       +      -
    113E  TYR*     3.5    34.3    -      -       +      -
    116E  VAL*     4.7    13.9    -      -       +      -
    117E  ILE*     4.6    12.3    -      -       +      -
    120E  THR*     5.7     4.5    -      -       +      +
    141E  HIS*     2.7    51.3    +      -       +      +
    142E  ALA*     3.6     6.7    -      -       -      +
    144E  GLU*     1.3    74.4    -      -       -      +
    146E  GLU*     1.3    64.1    +      -       -      +
    148E  PHE*     3.6     2.6    -      -       -      +
    149E  GLN*     3.0    18.4    +      -       -      +
----------------------------------------------------------
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Residues in contact with GLU 146 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    117E  ILE*     3.5    33.8    -      -       +      +
    121E  ARG*     2.9    34.9    +      -       -      -
    142E  ALA*     2.7    36.5    +      -       -      +
    145E  LEU*     1.3    72.4    -      -       -      +
    147E  LYS*     1.3    61.5    +      -       -      +
    149E  GLN*     3.2     7.5    +      -       -      +
    150E  TRP      3.1    16.8    +      -       -      -
      6F  ILE*     3.5    16.7    -      -       +      +
     71F  ARG*     2.9    38.5    +      -       -      +
     74F  THR*     3.5    13.4    -      -       +      +
    133F  VAL*     3.9     1.6    -      -       -      +
----------------------------------------------------------
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Residues in contact with LYS 147 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    143E  GLY      3.2    19.3    +      -       -      +
    144E  GLU*     3.6    25.2    +      -       +      +
    145E  LEU      3.2     0.4    -      -       -      -
    146E  GLU*     1.3    78.6    -      -       -      +
    148E  PHE*     1.3    55.4    +      -       -      +
    150E  TRP*     2.7    40.6    +      -       +      +
    151E  PHE*     3.2    27.5    +      -       +      -
     66F  ASP      5.1     0.2    +      -       -      -
     67F  GLU*     5.1    10.1    +      -       -      +
     70F  GLU*     2.8    44.1    +      -       -      +
     71F  ARG*     5.2     0.9    -      -       -      +
     74F  THR*     4.2    18.8    -      -       -      +
----------------------------------------------------------
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Residues in contact with PHE 148 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     35E  LEU*     4.2    11.7    -      -       +      -
     53E  MET*     4.1    33.4    -      -       +      -
     54E  ILE*     4.7     5.6    -      -       +      -
     57E  GLN*     3.0    50.9    -      -       +      +
    109E  LEU*     4.3     7.9    -      -       +      -
    113E  TYR*     3.4    38.4    -      +       -      -
    144E  GLU      2.8    15.6    +      -       -      +
    145E  LEU      3.6     2.2    -      -       -      +
    147E  LYS*     1.3    73.7    -      -       -      +
    149E  GLN*     1.3    64.7    +      -       -      +
    151E  PHE*     2.8    34.1    +      +       +      +
    152E  VAL*     3.1    34.1    +      -       +      -
----------------------------------------------------------
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Residues in contact with GLN 149 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    110E  ASP*     3.5    15.9    +      -       -      +
    113E  TYR*     3.5    22.4    -      -       +      +
    114E  ASN*     2.9    32.5    +      -       -      +
    117E  ILE*     3.5    19.3    -      -       +      +
    145E  LEU      3.0    12.1    +      -       -      +
    146E  GLU*     3.2    11.8    -      -       -      +
    148E  PHE*     1.3    78.7    -      -       -      +
    150E  TRP*     1.3    64.3    +      -       -      +
    152E  VAL*     2.8    14.6    +      -       +      +
    153E  ARG*     2.8    57.8    +      -       +      +
      6F  ILE*     5.1     3.3    -      -       -      +
      7F  PRO*     4.0     5.3    -      -       -      +
     74F  THR*     5.8     1.4    -      -       -      +
----------------------------------------------------------
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Residues in contact with TRP 150 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    146E  GLU      3.1     2.0    +      -       -      -
    147E  LYS*     2.7    23.6    +      -       +      +
    149E  GLN*     1.3    79.8    +      -       -      +
    151E  PHE*     1.3    83.5    +      +       -      -
    153E  ARG*     3.0     9.8    +      -       -      +
    154E  ALA*     2.6    47.0    +      -       +      +
    157E  GLU*     5.5     1.6    +      -       -      -
      4F  PHE*     4.4    15.2    -      +       -      -
     70F  GLU*     4.3    34.8    -      -       +      -
     73F  ALA*     3.6    45.9    +      -       +      +
     74F  THR*     3.8    26.2    -      -       +      +
     39L  HIS      5.0     0.7    -      -       -      -
     40L  TRP*     3.8    17.7    -      -       -      -
     42L  VAL      5.2     1.6    -      -       -      -
     43L  VAL*     5.7     3.5    -      -       +      +
     47L  PHE*     4.1    18.2    -      +       -      -
     51L  HIS*     4.3    10.1    -      +       -      -
     99L  ARG*     5.0     4.0    -      -       -      +
----------------------------------------------------------
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Residues in contact with PHE 151 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     53E  MET*     4.0    21.1    -      -       +      -
    147E  LYS*     3.2    31.6    +      -       +      -
    148E  PHE*     2.8    38.9    +      +       +      +
    150E  TRP*     1.3    89.4    -      +       -      +
    152E  VAL*     1.3    64.3    +      -       -      +
    154E  ALA*     3.3     5.7    +      -       -      +
    155E  HIS*     2.8    23.8    +      -       -      -
     70F  GLU*     5.0     0.9    -      -       -      -
     47L  PHE*     3.4    20.4    -      +       -      -
     48L  ILE*     4.0    11.7    -      -       +      -
     51L  HIS*     3.8    33.7    -      +       -      -
     52L  GLU*     6.0     0.7    -      -       -      -
----------------------------------------------------------
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Residues in contact with VAL 152 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     53E  MET*     4.7     2.2    -      -       +      -
    106E  LEU*     3.1    57.7    -      -       +      +
    109E  LEU*     4.3     8.1    -      -       +      -
    110E  ASP*     4.2    13.5    -      -       +      +
    113E  TYR*     5.5     1.8    -      -       +      -
    148E  PHE*     3.3    45.1    -      -       +      +
    149E  GLN*     2.8    14.3    +      -       -      +
    151E  PHE*     1.3    76.0    -      -       -      +
    153E  ARG*     1.3    65.3    +      -       +      +
    155E  HIS*     3.1    19.6    +      -       -      +
    156E  LEU*     3.9     5.0    -      -       +      +
----------------------------------------------------------
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Residues in contact with ARG 153 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    110E  ASP*     2.8    33.5    +      -       +      +
    114E  ASN*     3.1    32.5    +      -       -      +
    149E  GLN*     2.8    44.0    +      -       +      +
    150E  TRP*     3.4    10.5    -      -       -      +
    152E  VAL*     1.3    69.4    -      -       +      +
    154E  ALA*     1.3    53.0    +      -       -      +
    155E  HIS      2.8     5.2    -      -       -      -
    156E  LEU*     2.6    38.7    +      -       +      +
    157E  GLU*     3.5    10.1    +      -       +      +
      4F  PHE*     3.6    54.0    -      -       +      +
      5F  THR      3.7    19.0    +      -       -      -
      6F  ILE*     4.5     1.0    -      -       -      +
      7F  PRO*     4.1     6.9    -      -       -      +
     74F  THR      5.1     2.2    +      -       -      -
----------------------------------------------------------
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Residues in contact with ALA 154 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    150E  TRP*     2.6    31.9    +      -       +      +
    151E  PHE      3.3     0.4    +      -       -      +
    153E  ARG*     1.3    71.7    -      -       -      +
    155E  HIS*     1.3    58.3    +      -       -      +
    156E  LEU      3.2     1.2    +      -       -      -
    157E  GLU*     4.0     9.6    +      -       -      -
     43L  VAL*     3.7    20.4    -      -       +      +
     44L  GLY*     2.9    26.5    +      -       -      +
     47L  PHE*     3.6    37.4    -      -       +      +
----------------------------------------------------------
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Residues in contact with HIS 155 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     46E  ASN*     4.4     1.3    +      -       -      -
     49E  GLY      5.5     0.2    -      -       -      -
     50E  VAL*     4.0    17.1    +      -       +      +
     53E  MET*     3.8     9.4    -      -       +      -
    102E  VAL*     5.2     0.2    -      -       +      -
    103E  GLN*     4.0    10.7    +      -       -      +
    106E  LEU*     3.5    28.0    -      -       +      +
    151E  PHE      2.8    21.1    +      -       -      -
    152E  VAL*     3.1    12.2    +      -       -      +
    153E  ARG      2.7     1.0    +      -       -      -
    154E  ALA*     1.3    76.2    -      -       -      +
    156E  LEU*     1.3    61.9    +      -       +      +
     44L  GLY      2.9    17.0    -      -       -      +
     45L  PRO*     3.1    35.8    +      -       -      +
     46L  ASN*     4.8     0.8    -      -       -      -
     47L  PHE*     3.3    26.6    +      +       +      -
     48L  ILE*     3.5    33.5    +      -       +      +
----------------------------------------------------------
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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