Contacts of the helix formed by residues 158 - 181 (chain E) in PDB entry 3T2I


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 GLN 158 (chain E).
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    156E  ILE*     3.0    22.4    +      -       +      +
    157E  TYR*     1.3    74.8    +      -       -      +
    159E  ASN*     1.3    89.2    +      -       -      +
    160E  GLU      3.6     0.5    +      -       -      -
    161E  SER*     3.6     8.0    +      -       -      -
    162E  GLY*     2.9    17.3    +      -       -      -
    224E  THR*     4.9     2.9    -      -       -      +
    227E  ASN*     3.3    46.9    +      -       -      +
    228E  GLY*     3.9     1.6    +      -       -      -
    230E  VAL*     4.1     0.4    -      -       -      -
----------------------------------------------------------
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Residues in contact with ASN 159 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    158E  GLN*     1.3    90.5    +      -       -      +
    160E  GLU*     1.3    60.6    +      -       +      +
    162E  GLY*     3.6     0.2    -      -       -      -
    163E  ALA*     2.9    27.9    +      -       -      +
    223E  GLY      5.1     0.3    -      -       -      +
    227E  ASN      2.9    14.8    +      -       -      -
    228E  GLY*     3.5    30.2    -      -       -      +
    230E  VAL*     4.0     3.1    -      -       -      +
    233E  ASN*     5.6     3.4    -      -       -      -
----------------------------------------------------------
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Residues in contact with GLU 160 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    159E  ASN*     1.3    78.4    -      -       +      +
    161E  SER*     1.3    64.9    +      -       -      +
    163E  ALA*     3.1     2.3    +      -       -      -
    164E  ILE*     2.9    28.0    +      -       -      +
    217E  TYR*     2.5    39.2    +      -       +      -
    220E  ARG*     4.2     9.1    +      -       -      -
    233E  ASN*     5.7     5.4    -      -       -      +
    279E  SER      4.3     1.6    -      -       -      -
    280E  ASN*     3.3    20.7    -      -       +      +
    281E  PHE*     2.8    56.3    +      -       +      +
    282E  SER      4.6     0.5    +      -       -      -
----------------------------------------------------------
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Residues in contact with SER 161 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    155E  LEU*     3.9     9.3    -      -       -      +
    156E  ILE*     3.4    20.5    -      -       -      +
    158E  GLN      3.6     5.8    +      -       -      -
    159E  ASN*     3.4     0.4    -      -       -      +
    160E  GLU*     1.3    77.3    -      -       -      +
    162E  GLY*     1.3    58.6    +      -       -      +
    164E  ILE*     3.4     3.4    +      -       -      +
    165E  ASN*     2.9    26.9    +      -       -      +
    277E  PRO      3.7    14.6    -      -       -      -
    278E  THR*     3.3    19.2    +      -       -      -
    279E  SER      2.8    23.5    +      -       -      -
    280E  ASN*     4.9     0.3    -      -       -      -
----------------------------------------------------------
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Residues in contact with GLY 162 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    156E  ILE      3.0    12.7    +      -       -      -
    157E  TYR*     3.9     6.5    -      -       -      -
    158E  GLN      2.9    25.1    +      -       -      -
    159E  ASN      3.6     2.0    -      -       -      -
    161E  SER*     1.3    77.5    -      -       -      +
    163E  ALA*     1.3    55.6    +      -       -      +
    165E  ASN*     3.3     5.8    -      -       -      +
    166E  GLU*     2.9    29.3    +      -       -      +
    230E  VAL*     3.6    14.4    -      -       -      +
----------------------------------------------------------
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Residues in contact with ALA 163 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    159E  ASN      2.9    12.8    +      -       -      +
    160E  GLU*     3.1     8.3    +      -       -      +
    162E  GLY*     1.3    73.3    -      -       -      +
    164E  ILE*     1.3    54.1    +      -       -      +
    166E  GLU*     3.4     2.6    +      -       -      +
    167E  ALA*     2.8    34.5    +      -       -      +
    230E  VAL*     3.6    16.0    -      -       -      +
    233E  ASN*     3.7    29.6    -      -       +      -
    234E  SER*     3.7    11.9    -      -       -      +
    237E  ILE*     5.2     0.4    -      -       -      -
    281E  PHE*     3.8    13.5    -      -       +      -
----------------------------------------------------------
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Residues in contact with ILE 164 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    155E  LEU*     3.9    18.6    -      -       +      -
    160E  GLU      2.9    15.3    +      -       -      +
    161E  SER*     3.7     5.8    -      -       -      +
    163E  ALA*     1.3    71.0    -      -       -      +
    165E  ASN*     1.3    57.7    +      -       -      +
    167E  ALA*     3.7     5.7    -      -       -      +
    168E  ILE*     2.8    46.5    +      -       +      +
    237E  ILE*     4.5     2.2    -      -       +      -
    275E  LEU*     4.0    17.5    -      -       +      -
    279E  SER*     3.4    31.4    -      -       -      +
    280E  ASN      3.5    24.5    -      -       -      +
    281E  PHE*     3.7    14.1    -      -       +      +
    284E  LEU*     3.9    29.8    -      -       +      -
----------------------------------------------------------
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Residues in contact with ASN 165 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    146E  HIS*     2.6    37.7    +      -       -      -
    149E  THR*     3.9    21.9    +      -       -      +
    150E  ASP*     5.0     6.3    +      -       -      -
    155E  LEU*     3.3    36.4    +      -       +      +
    157E  TYR*     3.9    18.0    -      -       +      +
    161E  SER      2.9    14.2    +      -       -      +
    162E  GLY*     3.3    14.4    -      -       -      +
    164E  ILE*     1.3    77.7    -      -       -      +
    166E  GLU*     1.4    61.3    +      -       -      +
    168E  ILE*     3.5     4.8    +      -       -      +
    169E  SER*     3.2    20.3    +      -       -      -
----------------------------------------------------------
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Residues in contact with GLU 166 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    142E  HIS*     3.0    15.1    -      -       -      -
    146E  HIS*     2.9     7.3    +      -       -      -
    157E  TYR*     2.6    24.2    +      -       +      +
    162E  GLY      2.9    17.6    +      -       -      +
    163E  ALA      3.6     1.6    -      -       -      +
    164E  ILE      3.3     0.2    -      -       -      -
    165E  ASN*     1.4    72.2    +      -       -      +
    167E  ALA*     1.3    63.4    +      -       -      +
    169E  SER*     3.0     5.0    +      -       -      -
    170E  ASP*     2.9    25.4    +      -       -      +
    203E  ARG*     3.8     4.3    +      -       -      -
    230E  VAL*     3.3    35.7    -      -       +      +
    231E  HIS*     3.2    18.6    -      -       +      -
    234E  SER*     3.8     8.3    -      -       -      -
    321E   ZN      1.9    37.8    -      -       -      -
----------------------------------------------------------
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Residues in contact with ALA 167 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    163E  ALA      2.8    20.7    +      -       -      +
    164E  ILE      3.1     3.1    +      -       -      +
    166E  GLU*     1.3    72.9    -      -       -      +
    168E  ILE*     1.3    53.8    +      -       +      +
    170E  ASP*     3.1     2.5    +      -       -      +
    171E  ILE*     2.7    42.1    +      -       +      +
    234E  SER*     3.9     8.7    -      -       -      +
    237E  ILE*     3.6    35.0    -      -       +      -
    238E  ASN*     3.4    20.0    -      -       -      +
----------------------------------------------------------
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Residues in contact with ILE 168 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    145E  THR*     3.6    17.7    -      -       +      -
    149E  THR*     3.7    15.5    -      -       -      +
    155E  LEU*     4.7     2.5    -      -       +      -
    164E  ILE*     2.8    36.9    +      -       +      +
    165E  ASN*     3.7     5.8    -      -       -      +
    167E  ALA*     1.3    71.8    -      -       +      +
    169E  SER*     1.3    59.0    +      -       -      +
    171E  ILE*     3.3     4.8    +      -       +      +
    172E  PHE*     2.9    45.8    +      -       +      +
    237E  ILE*     6.5     0.7    -      -       +      -
    267E  PHE*     3.9    36.8    -      -       +      +
    270E  ALA*     6.3     0.2    -      -       +      -
    271E  LEU*     3.8    27.8    -      -       +      -
    275E  LEU*     4.6     7.6    -      -       +      -
    284E  LEU*     5.4     0.7    -      -       +      -
----------------------------------------------------------
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Residues in contact with SER 169 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    142E  HIS*     2.6    60.4    +      -       -      +
    145E  THR*     3.6    11.0    -      -       -      +
    146E  HIS*     3.3    28.3    +      -       -      -
    149E  THR*     5.3     0.3    +      -       -      -
    165E  ASN      3.2     8.3    +      -       -      -
    166E  GLU      3.0     5.3    +      -       -      -
    168E  ILE*     1.3    76.8    -      -       -      +
    170E  ASP*     1.3    58.4    +      -       -      +
    173E  GLY*     2.8    23.7    +      -       -      -
----------------------------------------------------------
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Residues in contact with ASP 170 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    142E  HIS*     2.7    27.5    +      -       -      -
    166E  GLU*     2.9    13.2    +      -       -      +
    167E  ALA      3.1     6.0    +      -       -      +
    169E  SER*     1.3    75.9    -      -       -      +
    171E  ILE*     1.3    59.7    +      -       -      +
    173E  GLY*     3.9     1.0    -      -       -      -
    174E  THR*     3.0    34.8    +      -       -      -
    188E  ILE*     3.6    24.4    -      -       +      +
    203E  ARG*     2.8    35.6    +      -       -      -
    205E  MET*     3.8     3.2    -      -       -      +
    234E  SER*     4.3     5.2    +      -       -      -
    238E  ASN*     3.0    29.7    +      -       -      +
----------------------------------------------------------
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Residues in contact with ILE 171 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    167E  ALA*     2.7    38.1    +      -       +      +
    168E  ILE*     3.7     6.3    -      -       -      +
    170E  ASP*     1.3    71.7    -      -       -      +
    172E  PHE*     1.3    70.2    +      -       +      +
    174E  THR*     3.2     4.3    +      -       -      -
    175E  LEU*     2.9    45.8    +      -       +      +
    186E  TRP*     5.9     1.2    -      -       +      -
    205E  MET*     3.7    15.9    -      -       +      -
    237E  ILE*     4.5     3.1    -      -       +      -
    238E  ASN*     4.2     1.6    -      -       -      +
    241E  ALA*     3.6    29.6    -      -       +      -
    263E  LEU*     4.3    16.4    -      -       +      -
    267E  PHE*     3.7    31.4    -      -       +      -
----------------------------------------------------------
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Residues in contact with PHE 172 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     83E  TYR*     3.4    33.2    -      +       +      -
     84E  TYR*     3.3    27.4    -      +       +      +
     88E  HIS*     3.8    11.4    -      +       -      -
    145E  THR*     3.6     8.7    -      -       +      +
    168E  ILE*     2.9    45.8    +      -       +      +
    171E  ILE*     1.3    75.0    -      -       +      +
    173E  GLY*     1.4    67.3    +      -       -      +
    175E  LEU*     4.0    12.7    -      -       +      +
    176E  VAL*     2.9    29.2    +      -       -      +
    264E  GLY      3.8     8.1    -      -       -      -
    267E  PHE*     3.9    16.4    -      -       +      -
    268E  TYR*     3.4    37.9    -      +       +      -
    271E  LEU*     4.8     6.7    -      -       +      -
----------------------------------------------------------
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Residues in contact with GLY 173 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    138E  ASP*     3.8    24.7    -      -       -      -
    141E  ALA*     3.8    19.4    -      -       -      -
    142E  HIS*     3.9     2.1    -      -       -      +
    169E  SER      2.8    24.9    +      -       -      -
    170E  ASP*     3.9     1.1    -      -       -      -
    171E  ILE      3.3     0.2    -      -       -      -
    172E  PHE*     1.4    73.7    -      -       -      +
    174E  THR*     1.3    56.1    +      -       -      +
    176E  VAL*     3.4     3.1    +      -       -      +
    177E  GLU*     3.0    26.7    +      -       -      +
----------------------------------------------------------
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Residues in contact with THR 174 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    138E  ASP*     4.6     2.8    -      -       -      +
    170E  ASP      3.0    20.2    +      -       -      -
    171E  ILE*     3.6     4.3    -      -       -      +
    173E  GLY*     1.3    74.6    -      -       -      +
    175E  LEU*     1.3    59.6    +      -       +      +
    177E  GLU*     3.0     9.9    +      -       -      +
    178E  PHE*     2.8    41.0    +      -       +      -
    185E  ASP      3.5    25.0    +      -       -      +
    186E  TRP*     3.8    25.7    -      -       +      -
    187E  GLU      4.5     3.5    +      -       -      -
    188E  ILE*     3.6    11.4    -      -       -      +
    205E  MET*     3.4    14.9    -      -       -      -
----------------------------------------------------------
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Residues in contact with LEU 175 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     83E  TYR*     3.6    27.4    -      -       +      +
    171E  ILE*     2.9    36.2    +      -       +      +
    172E  PHE*     3.3     8.9    +      -       +      +
    174E  THR*     1.3    74.8    -      -       +      +
    176E  VAL*     1.3    53.7    +      -       -      +
    178E  PHE*     3.3     3.8    +      -       +      +
    179E  TYR*     2.8    34.1    +      -       -      +
    186E  TRP*     4.7     6.7    -      -       +      -
    260E  ARG*     3.8    42.6    -      -       +      +
    263E  LEU*     4.3     9.6    -      -       +      -
    264E  GLY*     3.7    32.5    -      -       -      +
----------------------------------------------------------
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Residues in contact with VAL 176 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     79E  VAL*     4.0    13.9    -      -       +      +
     80E  THR*     3.9    26.5    -      -       +      +
     83E  TYR*     3.5    31.6    -      -       +      -
     84E  TYR*     4.9     2.7    -      -       +      -
    137E  ILE*     3.8    20.9    -      -       +      -
    141E  ALA*     3.6    22.7    -      -       +      -
    172E  PHE      2.9    21.5    +      -       -      +
    173E  GLY      3.8     0.4    -      -       -      +
    175E  LEU*     1.3    72.6    -      -       -      +
    177E  GLU*     1.3    67.5    +      -       -      +
    179E  TYR*     3.2     7.1    +      -       -      +
    180E  ALA*     2.9    23.2    +      -       -      +
----------------------------------------------------------
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Residues in contact with GLU 177 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    137E  ILE*     3.7    26.8    -      -       +      +
    138E  ASP*     3.1    20.0    +      -       +      +
    173E  GLY      3.0    14.6    +      -       -      +
    174E  THR*     3.0    11.6    +      -       -      +
    176E  VAL*     1.3    78.4    -      -       -      +
    178E  PHE*     1.3    63.3    +      -       +      +
    180E  ALA*     3.3     3.5    +      -       -      +
    181E  ASN      3.1    15.8    +      -       -      -
    182E  LYS      4.5     1.6    +      -       -      -
    183E  ASN*     4.4     5.2    -      -       -      +
    184E  PRO*     3.2    14.8    -      -       +      +
    185E  ASP*     3.0    19.6    +      -       -      +
    190E  GLU*     3.2     2.0    -      -       -      +
    191E  ASP*     4.9     2.4    -      -       -      +
    317E   CA      2.4    27.4    -      -       -      -
    318E   CA      2.3    27.6    -      -       -      -
----------------------------------------------------------
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Residues in contact with PHE 178 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    174E  THR*     2.8    31.7    +      -       +      +
    175E  LEU*     3.8     8.3    -      -       +      +
    176E  VAL      3.2     0.2    -      -       -      -
    177E  GLU*     1.3    74.8    -      -       -      +
    179E  TYR*     1.3    65.9    +      -       -      +
    181E  ASN*     3.0    21.7    +      -       -      +
    184E  PRO*     3.5    26.9    -      -       +      -
    185E  ASP*     3.3    33.9    -      -       -      -
    186E  TRP*     3.5    33.2    -      +       -      -
    260E  ARG*     3.4    49.1    -      -       +      +
----------------------------------------------------------
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Residues in contact with TYR 179 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     79E  VAL*     3.8    24.2    -      -       +      -
     82E  ASP*     3.6    10.6    +      -       +      +
     83E  TYR*     3.8    43.5    -      +       +      -
     86E  ASN*     2.9    30.7    +      -       +      -
     87E  VAL*     4.1    19.1    -      -       +      -
    175E  LEU      2.8    21.1    +      -       -      +
    176E  VAL*     3.4     4.9    -      -       -      +
    178E  PHE*     1.3    74.3    -      -       -      +
    180E  ALA*     1.3    65.0    +      -       -      +
    181E  ASN*     3.7     4.7    -      -       -      +
----------------------------------------------------------
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Residues in contact with ALA 180 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     76E  TYR*     6.0     0.9    -      -       +      -
     79E  VAL*     3.9    12.1    -      -       +      -
    137E  ILE*     3.6    24.5    -      -       +      -
    176E  VAL      2.9    16.0    +      -       -      +
    177E  GLU*     3.6     4.7    -      -       -      +
    179E  TYR*     1.3    77.6    -      -       -      +
    181E  ASN*     1.3    72.6    +      -       -      +
    182E  LYS*     3.3     8.3    +      -       +      +
----------------------------------------------------------
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Residues in contact with ASN 181 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    177E  GLU      3.1     8.5    +      -       -      -
    178E  PHE*     3.0    19.5    +      -       -      +
    179E  TYR      3.7     6.1    -      -       -      +
    180E  ALA*     1.3    80.2    -      -       -      +
    182E  LYS*     1.3    61.0    +      -       -      +
    183E  ASN      4.0     0.2    -      -       -      -
    184E  PRO*     4.3    12.0    -      -       -      +
----------------------------------------------------------
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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