Contacts of the helix formed by residues 136 - 161 (chain E) in PDB entry 3PJA


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

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

Legend:
Dist - nearest distance (Å) between atoms of two residues
Surf - contact surface area (Å2) between two residues
HB   - hydrophilic-hydrophilic contact (hydrogen bond)
Arom - aromatic-aromatic contact
Phob - hydrophobic-hydrophobic contact
DC   - hydrophobic-hydrophilic contact (destabilizing contact)
+/-  - indicates presence/absence of a specific contacts
*    - indicates residues forming contacts  by their side chain
       (including CA atoms)
Residues in contact with ASP 136 (chain E).
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     17A  GLU*     4.0     3.1    -      -       -      +
     86A  ARG*     2.7    37.2    +      -       -      +
     88E  HIS*     3.1    25.4    +      -       +      +
     91E  TRP*     6.3     0.9    -      -       +      -
     92E  ARG*     4.3     1.2    +      -       -      -
    134E  HIS*     3.5     7.2    +      -       -      +
    135E  LEU*     1.3    75.4    -      -       -      +
    137E  VAL*     1.3    75.5    +      -       -      +
    138E  GLU*     3.1    26.9    +      -       -      +
    139E  ASP*     3.1    26.2    +      -       -      +
    140E  TYR*     3.0    19.9    +      -       -      +
----------------------------------------------------------
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Residues in contact with VAL 137 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     10A  LEU*     4.0    22.2    -      -       +      +
     13A  PHE*     4.0    21.8    -      -       +      -
     14A  LEU*     4.0    25.4    -      -       +      -
     17A  GLU*     4.4    14.8    -      -       -      +
     86A  ARG*     4.4     1.2    -      -       -      +
    116E  ARG*     3.7    36.8    -      -       -      +
    135E  LEU      3.3     2.0    +      -       -      -
    136E  ASP*     1.3    78.4    +      -       -      +
    138E  GLU*     1.3    60.9    +      -       -      +
    140E  TYR*     3.2     5.7    +      -       -      +
    141E  LEU*     3.0    30.3    +      -       +      +
----------------------------------------------------------
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Residues in contact with GLU 138 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     14A  LEU*     4.4    13.4    -      -       +      +
     17A  GLU*     4.3    18.9    -      -       -      +
     21A  ARG*     4.6    10.3    +      -       -      -
     92E  ARG*     3.4    17.9    +      -       -      +
     96E  GLN*     5.1     0.2    -      -       -      -
    136E  ASP*     3.1    13.4    +      -       -      +
    137E  VAL*     1.3    76.6    -      -       -      +
    139E  ASP*     1.3    63.9    +      -       -      +
    141E  LEU*     3.3     4.9    +      -       -      +
    142E  SER*     3.0    26.4    +      -       -      -
    188E  ASN*     3.3    40.8    +      -       -      +
    191E  LEU*     4.1    22.5    -      -       +      +
----------------------------------------------------------
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Residues in contact with ASP 139 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     88E  HIS*     2.9    25.2    -      -       -      -
     91E  TRP*     4.9     0.2    -      -       -      -
     92E  ARG*     3.1    28.6    +      -       -      +
     95E  LEU*     3.7    18.3    -      -       +      +
     96E  GLN*     3.1    30.1    +      -       +      +
     99E  VAL*     4.8     1.9    -      -       -      +
    135E  LEU*     4.3    12.1    -      -       +      -
    136E  ASP*     3.1    23.4    +      -       +      +
    138E  GLU*     1.3    74.1    -      -       -      +
    140E  TYR*     1.3    68.4    +      -       -      +
    142E  SER*     3.1     5.2    +      -       -      -
    143E  GLY*     3.0    17.2    +      -       -      -
----------------------------------------------------------
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Residues in contact with TYR 140 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
      6A  ILE*     4.0     7.4    -      -       +      +
      7A  PHE*     5.9     1.1    -      +       -      -
     10A  LEU*     3.6    33.0    -      -       +      -
     99E  VAL*     3.9    21.1    -      -       +      +
    113E  LEU*     3.8    18.9    -      -       +      +
    114E  VAL*     2.7    26.2    +      -       +      -
    115E  THR      4.1     0.7    -      -       -      -
    116E  ARG*     3.6    56.6    +      -       +      -
    119E  VAL*     4.3     8.5    -      -       +      -
    135E  LEU*     4.3     9.9    -      -       +      +
    136E  ASP      3.0     7.6    +      -       -      +
    137E  VAL      3.2     9.9    -      -       -      +
    139E  ASP*     1.3    74.9    -      -       -      +
    141E  LEU*     1.3    66.8    +      -       +      +
    143E  GLY*     3.0    14.0    +      -       -      -
    144E  VAL*     3.0    34.8    +      -       +      +
----------------------------------------------------------
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Residues in contact with LEU 141 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
      7A  PHE*     3.9    13.0    -      -       +      -
     10A  LEU*     3.4    30.1    -      -       +      -
     14A  LEU*     4.2    14.6    -      -       +      -
    137E  VAL*     3.0    22.5    +      -       +      +
    138E  GLU*     3.6     8.3    -      -       -      +
    139E  ASP      3.3     0.2    -      -       -      -
    140E  TYR*     1.3    82.5    -      -       +      +
    142E  SER*     1.3    61.9    +      -       -      +
    144E  VAL*     3.2     6.3    +      -       +      +
    145E  LEU*     3.0    26.2    +      -       -      +
    181E  PHE*     3.8    24.0    -      -       +      -
    184E  LEU*     3.9    19.7    -      -       +      -
    186E  LEU*     4.3     2.0    -      -       +      -
    191E  LEU*     4.1    25.6    -      -       +      -
----------------------------------------------------------
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Residues in contact with SER 142 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     96E  GLN*     3.4    32.5    +      -       -      -
    138E  GLU      3.0    14.9    +      -       -      -
    139E  ASP      3.1     8.3    +      -       -      -
    141E  LEU*     1.3    71.9    -      -       -      +
    143E  GLY*     1.3    66.7    +      -       -      +
    145E  LEU*     3.2     4.3    +      -       -      +
    146E  ILE*     3.0    28.8    +      -       -      +
    191E  LEU*     3.4    19.6    -      -       -      +
    194E  ARG*     3.8    17.5    +      -       -      +
----------------------------------------------------------
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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
----------------------------------------------------------
     96E  GLN*     3.6    24.5    +      -       -      +
     99E  VAL*     4.2     4.5    -      -       -      -
    100E  PHE*     3.5    20.7    -      -       -      +
    103E  ALA*     5.7     0.4    -      -       -      -
    139E  ASP      3.0     7.9    +      -       -      -
    140E  TYR      3.0     8.0    +      -       -      -
    142E  SER*     1.3    76.4    -      -       -      +
    144E  VAL*     1.3    58.2    +      -       -      +
    146E  ILE*     3.4     6.3    +      -       -      +
    147E  LEU*     3.0    23.4    +      -       -      +
----------------------------------------------------------
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Residues in contact with VAL 144 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
      7A  PHE*     4.6     4.3    -      -       +      -
     99E  VAL*     5.2     2.2    -      -       +      -
    103E  ALA*     5.4     5.2    -      -       +      -
    113E  LEU*     4.2    15.7    -      -       +      -
    140E  TYR*     3.0    52.0    +      -       +      +
    141E  LEU*     3.5     9.9    -      -       +      +
    142E  SER      3.1     0.2    -      -       -      -
    143E  GLY*     1.3    75.4    -      -       -      +
    145E  LEU*     1.3    60.4    +      -       -      +
    147E  LEU*     3.2    11.0    -      -       +      +
    148E  ALA*     3.0    23.9    +      -       -      +
    177E  LEU*     4.0    29.1    -      -       +      +
    181E  PHE*     4.2    16.6    -      -       +      -
----------------------------------------------------------
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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
----------------------------------------------------------
    141E  LEU      3.0    17.5    +      -       -      +
    142E  SER      3.2     7.4    +      -       -      +
    144E  VAL*     1.3    75.6    -      -       -      +
    146E  ILE*     1.3    64.5    +      -       -      +
    148E  ALA*     3.0    15.8    +      -       +      +
    149E  SER*     3.1    15.1    +      -       -      -
    177E  LEU*     6.5     0.2    -      -       +      -
    181E  PHE*     3.5    32.8    -      -       +      -
    191E  LEU*     4.1    16.6    -      -       +      +
    194E  ARG*     3.4    35.9    -      -       +      +
    195E  TYR*     3.7    20.6    -      -       +      +
    198E  LEU*     4.0    32.5    -      -       +      -
    201E  ASP*     4.5     1.2    -      -       -      +
----------------------------------------------------------
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Residues in contact with ILE 146 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     96E  GLN*     4.5    16.8    -      -       +      +
     97E  ARG*     4.9     4.3    -      -       +      +
    100E  PHE*     3.4    32.3    -      -       +      -
    142E  SER      3.0    16.2    +      -       -      +
    143E  GLY*     3.5    14.4    -      -       -      +
    144E  VAL      3.3     0.2    -      -       -      -
    145E  LEU*     1.3    71.2    -      -       -      +
    147E  LEU*     1.3    66.2    +      -       -      +
    149E  SER*     3.3     8.3    +      -       -      -
    150E  GLU*     3.0    21.4    +      -       +      +
    194E  ARG*     3.9    33.0    -      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 147 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    100E  PHE*     3.5    11.6    -      -       +      -
    103E  ALA*     3.7    29.4    -      -       +      +
    104E  PHE*     3.7    42.4    -      -       +      +
    107E  TYR*     5.0     3.1    -      -       +      -
    113E  LEU*     4.3    14.6    -      -       +      -
    143E  GLY      3.0    14.0    +      -       -      +
    144E  VAL*     3.2    13.9    -      -       +      +
    146E  ILE*     1.3    76.7    -      -       -      +
    148E  ALA*     1.3    64.1    +      -       -      +
    150E  GLU*     3.1     3.2    +      -       +      +
    151E  LEU*     2.9    36.2    +      -       +      +
    173E  PHE*     4.2    22.2    -      -       +      -
    177E  LEU*     5.5     0.7    -      -       +      -
----------------------------------------------------------
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Residues in contact with ALA 148 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    144E  VAL      3.0    11.6    +      -       -      +
    145E  LEU*     3.0    13.3    +      -       +      +
    147E  LEU*     1.3    77.2    -      -       -      +
    149E  SER*     1.3    61.7    +      -       -      +
    151E  LEU*     3.1     3.4    +      -       -      -
    152E  SER*     3.0    19.6    +      -       -      -
    174E  ILE*     3.4    20.0    -      -       +      +
    177E  LEU*     4.1    15.7    -      -       +      +
    198E  LEU*     3.6    31.6    -      -       +      -
    201E  ASP*     3.9     5.7    -      -       -      +
----------------------------------------------------------
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Residues in contact with SER 149 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    145E  LEU      3.1    10.6    +      -       -      -
    146E  ILE*     3.7    10.1    -      -       -      -
    148E  ALA*     1.3    72.9    -      -       -      +
    150E  GLU*     1.3    66.5    +      -       -      +
    152E  SER*     2.8    17.8    +      -       -      -
    153E  ARG*     3.1    10.6    +      -       -      +
    197E  GLY      5.8     0.5    -      -       -      -
    201E  ASP*     3.0    28.9    +      -       -      -
----------------------------------------------------------
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Residues in contact with GLU 150 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     43E  GLN*     3.7    26.0    +      -       -      +
     46E  HIS*     2.9    29.8    +      -       -      +
    100E  PHE*     3.6    35.0    -      -       +      -
    104E  PHE*     3.8    29.9    -      -       +      -
    146E  ILE*     3.0     7.5    +      -       +      +
    147E  LEU*     3.5     9.2    -      -       +      +
    149E  SER*     1.3    76.6    -      -       -      +
    151E  LEU*     1.3    56.9    +      -       -      +
    153E  ARG*     3.5    12.5    +      -       -      +
    154E  LEU*     3.0    26.2    +      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 151 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    104E  PHE*     4.1    15.9    -      -       +      -
    107E  TYR*     3.9    35.9    -      -       +      -
    147E  LEU*     2.9    27.5    +      -       +      +
    148E  ALA*     3.6     4.7    -      -       -      +
    149E  SER      3.1     0.4    -      -       -      -
    150E  GLU*     1.3    76.0    -      -       -      +
    152E  SER*     1.3    60.8    +      -       -      +
    154E  LEU*     4.0    22.0    -      -       +      -
    155E  SER      3.0    21.3    +      -       -      -
    170E  ILE*     3.4    29.8    -      -       +      +
    173E  PHE*     3.6    37.5    -      -       +      -
    174E  ILE*     4.1     6.1    -      -       +      -
----------------------------------------------------------
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Residues in contact with SER 152 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    148E  ALA      3.0     9.5    +      -       -      -
    149E  SER      2.8    18.4    +      -       -      -
    151E  LEU*     1.3    73.1    -      -       -      +
    153E  ARG*     1.3    66.4    +      -       -      +
    155E  SER*     3.0    12.6    +      -       -      -
    156E  VAL*     3.1    16.6    +      -       -      +
    174E  ILE*     4.1     0.6    -      -       -      +
    201E  ASP*     3.1    25.9    +      -       -      -
    204E  LYS*     3.8    24.8    +      -       -      +
    205E  VAL*     3.6    27.5    -      -       -      +
----------------------------------------------------------
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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
----------------------------------------------------------
     43E  GLN*     3.5    29.1    +      -       -      +
     46E  HIS*     3.3    40.6    +      -       +      +
    149E  SER      3.1     8.3    +      -       -      +
    150E  GLU*     3.6    15.9    +      -       -      +
    152E  SER*     1.3    84.2    +      -       -      +
    154E  LEU*     1.3    55.8    +      -       -      +
    156E  VAL*     3.4     3.8    +      -       -      +
    157E  ASN*     3.0    44.3    +      -       -      +
    204E  LYS*     4.1    15.0    -      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 154 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     45E  VAL*     3.9    30.3    -      -       +      +
     46E  HIS*     3.6    26.7    -      -       +      +
    104E  PHE*     4.4     7.4    -      -       +      -
    107E  TYR*     5.7     0.9    -      -       +      -
    108E  LEU*     4.4    18.2    -      -       +      -
    150E  GLU      3.0    18.0    +      -       -      +
    151E  LEU*     3.7    25.1    -      -       +      +
    152E  SER      3.1     0.4    -      -       -      -
    153E  ARG*     1.3    74.6    -      -       -      +
    155E  SER*     1.3    65.3    +      -       -      +
    157E  ASN      4.5     0.2    -      -       -      +
    158E  SER*     2.9    36.3    +      -       -      +
    166E  ARG*     3.9    30.1    -      -       -      +
    170E  ILE*     4.2     1.6    -      -       +      -
----------------------------------------------------------
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Residues in contact with SER 155 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    151E  LEU      3.0    14.7    +      -       -      -
    152E  SER*     3.3    12.8    -      -       -      -
    154E  LEU*     1.3    76.7    -      -       -      +
    156E  VAL*     1.3    64.9    +      -       -      +
    158E  SER*     3.1     7.5    +      -       -      -
    159E  VAL*     3.1    25.4    +      -       -      +
    167E  PRO*     3.5    23.7    -      -       -      +
    170E  ILE*     3.9    19.3    -      -       -      +
    205E  VAL*     4.2    11.7    -      -       -      +
    208E  VAL*     3.8    15.1    -      -       -      +
----------------------------------------------------------
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Residues in contact with VAL 156 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    152E  SER      3.1     5.1    +      -       -      +
    153E  ARG*     3.7     7.6    -      -       -      +
    155E  SER*     1.3    82.3    -      -       -      +
    157E  ASN*     1.3    73.5    +      -       -      +
    159E  VAL*     3.2     6.1    +      -       -      +
    160E  THR*     3.0    24.6    +      -       -      +
    204E  LYS*     3.8    30.3    -      -       +      -
    208E  VAL*     3.8    24.9    -      -       +      -
----------------------------------------------------------
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Residues in contact with ASN 157 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     46E  HIS*     3.3    59.7    +      -       +      +
    153E  ARG*     3.0    37.1    +      -       -      +
    154E  LEU      4.2     1.1    -      -       -      +
    156E  VAL*     1.3    85.2    -      -       -      +
    158E  SER*     1.3    61.7    +      -       -      +
    160E  THR*     3.3    13.1    +      -       -      -
    161E  ALA*     3.2    18.2    +      -       -      +
----------------------------------------------------------
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Residues in contact with SER 158 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     46E  HIS      5.3     0.9    -      -       -      -
    154E  LEU*     2.9    23.6    +      -       -      +
    155E  SER*     3.1     9.2    +      -       -      -
    157E  ASN*     1.3    74.6    -      -       -      +
    159E  VAL*     1.3    69.1    +      -       -      +
    161E  ALA*     3.0    13.0    +      -       -      +
    163E  ASP*     3.0    44.0    +      -       -      +
    166E  ARG*     4.0    21.9    -      -       -      +
    167E  PRO*     3.5    12.5    -      -       -      +
----------------------------------------------------------
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Residues in contact with VAL 159 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    155E  SER      3.1     3.1    +      -       -      +
    156E  VAL*     3.5     8.5    -      -       -      +
    158E  SER*     1.3    82.2    +      -       -      +
    160E  THR*     1.3    65.8    +      -       -      +
    162E  GLY      2.9    12.0    +      -       -      -
    163E  ASP      3.8     6.7    -      -       -      +
    164E  TYR*     3.4    26.0    +      -       +      +
    167E  PRO*     3.3    29.6    -      -       +      -
    208E  VAL*     3.5    22.2    -      -       +      -
    212E  LEU*     4.0    20.6    -      -       +      -
----------------------------------------------------------
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Residues in contact with THR 160 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    156E  VAL*     3.0    20.1    +      -       -      +
    157E  ASN*     3.4    18.7    +      -       -      -
    158E  SER      3.2     0.2    -      -       -      -
    159E  VAL*     1.3    78.9    -      -       -      +
    161E  ALA*     1.3    57.7    +      -       +      +
    162E  GLY      3.4     2.3    +      -       -      -
----------------------------------------------------------
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Residues in contact with ALA 161 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     46E  HIS      4.9     1.3    -      -       -      +
     47E  GLN      4.8     2.0    -      -       -      -
     48E  GLY*     4.3    33.4    -      -       -      +
    157E  ASN      3.2    13.0    +      -       -      +
    158E  SER*     3.0     8.8    +      -       -      +
    159E  VAL      3.0     1.2    -      -       -      -
    160E  THR*     1.3    77.1    -      -       +      +
    162E  GLY*     1.3    57.5    +      -       -      +
    163E  ASP*     3.3     6.7    +      -       +      +
----------------------------------------------------------
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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