Contacts of the helix formed by residues 136 - 167 (chain A) in PDB entry 3UON


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 THR 136 (chain A).
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     57A  VAL*     3.7     8.0    -      -       -      +
    133A  VAL      4.6     6.7    -      -       -      +
    134A  LYS*     3.3    14.5    +      -       -      +
    135A  ARG*     1.3    79.7    -      -       -      +
    137A  THR*     1.3    64.2    +      -       -      +
    138A  LYS*     3.4    10.2    +      -       -      +
    139A  MET*     3.3    25.3    +      -       +      +
    140A  ALA*     3.2    21.7    +      -       -      +
   1065A  LYS*     4.3     6.7    -      -       -      +
   1165A   CL      3.7    17.0    -      -       +      -
----------------------------------------------------------
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Residues in contact with THR 137 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     56A  THR*     6.3     0.4    -      -       -      -
     57A  VAL*     4.1     9.6    -      -       +      +
     60A  TYR*     3.4    44.2    -      -       +      +
    136A  THR*     1.3    73.7    -      -       -      +
    138A  LYS*     1.3    59.2    +      -       -      +
    140A  ALA*     3.5     2.8    +      -       -      +
    141A  GLY*     3.0    24.6    +      -       -      -
   1065A  LYS*     5.1     1.1    -      -       -      +
   1165A   CL      3.4    20.2    -      -       +      +
----------------------------------------------------------
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Residues in contact with LYS 138 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    136A  THR*     3.1    10.2    +      -       -      +
    137A  THR*     1.3    79.8    +      -       -      +
    139A  MET*     1.3    67.3    +      -       +      +
    140A  ALA      3.2     0.2    +      -       -      -
    141A  GLY*     3.3     2.3    +      -       -      -
    142A  MET*     3.0    34.1    +      -       +      +
----------------------------------------------------------
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Residues in contact with MET 139 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    134A  LYS      3.9    18.4    -      -       -      +
    135A  ARG*     5.3     1.3    -      -       -      -
    136A  THR*     3.3    19.9    +      -       -      +
    138A  LYS*     1.3    78.7    -      -       +      +
    140A  ALA*     1.3    57.7    +      -       -      +
    142A  MET*     3.3    27.4    +      -       +      +
    143A  MET*     2.9    54.4    +      -       +      +
----------------------------------------------------------
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Residues in contact with ALA 140 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     57A  VAL*     4.3    14.4    -      -       +      -
     60A  TYR*     4.1    23.8    -      -       +      -
     61A  PHE*     4.6    14.8    -      -       +      -
    136A  THR      3.2    10.5    +      -       -      +
    137A  THR*     3.5    10.5    -      -       -      +
    138A  LYS      3.1     0.8    -      -       -      -
    139A  MET*     1.3    78.2    -      -       -      +
    141A  GLY*     1.3    59.7    +      -       -      +
    143A  MET*     3.0     8.0    +      -       -      +
    144A  ILE*     2.9    34.7    +      -       -      +
----------------------------------------------------------
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Residues in contact with GLY 141 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     60A  TYR*     5.2     1.7    -      -       -      -
    137A  THR      3.0    12.3    +      -       -      -
    138A  LYS      3.8     2.5    -      -       -      -
    140A  ALA*     1.3    79.2    -      -       -      +
    142A  MET*     1.3    56.2    +      -       -      +
    144A  ILE*     3.8    12.6    -      -       -      +
    145A  ALA*     2.9    28.1    +      -       -      +
----------------------------------------------------------
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Residues in contact with MET 142 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    138A  LYS*     3.0    26.7    +      -       +      +
    139A  MET*     3.5    37.5    -      -       +      +
    141A  GLY*     1.3    75.7    -      -       -      +
    143A  MET*     1.3    65.3    +      -       +      +
    145A  ALA*     3.3     7.5    +      -       +      +
    146A  ALA*     2.8    29.5    +      -       +      +
----------------------------------------------------------
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Residues in contact with MET 143 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     61A  PHE*     5.1     1.8    -      -       +      -
    116A  ILE*     3.4    49.8    -      -       +      +
    119A  PHE*     6.2     3.4    -      -       +      -
    139A  MET*     2.9    40.1    +      -       +      +
    140A  ALA*     3.0     5.6    +      -       -      +
    142A  MET*     1.3    77.6    -      -       +      +
    144A  ILE*     1.3    60.7    +      -       -      +
    146A  ALA*     3.4     9.2    +      -       -      +
    147A  ALA      3.0    22.5    +      -       -      -
----------------------------------------------------------
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Residues in contact with ILE 144 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     60A  TYR*     3.7    38.8    -      -       +      +
     61A  PHE*     4.2    16.8    -      -       +      -
     64A  SER*     3.7    14.8    -      -       -      +
    113A  ASN*     4.6     3.4    -      -       -      +
    116A  ILE*     4.7     1.8    -      -       +      -
    140A  ALA      2.9    27.4    +      -       -      +
    141A  GLY*     3.8     9.0    -      -       -      +
    143A  MET*     1.3    73.9    -      -       -      +
    145A  ALA*     1.3    65.6    +      -       -      +
    147A  ALA*     3.1     7.4    +      -       -      +
    148A  TRP*     3.0    52.9    +      -       +      +
----------------------------------------------------------
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Residues in contact with ALA 145 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    141A  GLY      2.9    20.0    +      -       -      +
    142A  MET*     3.3    10.3    +      -       +      +
    144A  ILE*     1.3    77.3    -      -       -      +
    146A  ALA*     1.3    62.0    +      -       -      +
    148A  TRP*     4.0     3.4    -      -       -      +
    149A  VAL*     3.0    36.5    +      -       +      +
----------------------------------------------------------
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Residues in contact with ALA 146 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    142A  MET*     2.8    21.2    +      -       +      +
    143A  MET*     3.7    11.7    -      -       -      +
    145A  ALA*     1.3    72.4    -      -       -      +
    147A  ALA*     1.3    55.0    +      -       -      +
    149A  VAL*     4.7     3.6    -      -       -      -
    150A  LEU*     2.8    44.2    +      -       +      +
----------------------------------------------------------
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Residues in contact with ALA 147 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    109A  ALA*     4.8     1.6    -      -       -      +
    112A  MET*     4.1    24.5    -      -       +      +
    113A  ASN*     4.4    15.3    -      -       -      +
    116A  ILE*     4.0    16.4    -      -       +      -
    143A  MET      3.0    14.1    +      -       -      +
    144A  ILE*     3.1    11.2    +      -       -      +
    146A  ALA*     1.3    76.8    -      -       -      +
    148A  TRP*     1.3    55.7    +      -       +      +
    150A  LEU*     3.9     0.9    -      -       -      +
    151A  SER*     2.7    39.2    +      -       -      -
----------------------------------------------------------
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Residues in contact with TRP 148 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     64A  SER*     2.8    42.1    +      -       -      +
     67A  CYS*     4.1    10.3    -      -       +      -
     68A  ALA*     3.8    32.5    -      -       +      -
     71A  ILE*     5.1     7.2    -      -       +      -
    105A  VAL*     4.9     9.8    -      -       +      +
    106A  VAL*     4.1    20.4    -      -       +      -
    109A  ALA*     3.9    23.8    -      -       +      -
    113A  ASN*     4.6     1.0    -      -       -      +
    144A  ILE*     3.0    38.6    +      -       +      +
    145A  ALA*     4.0     4.7    -      -       -      +
    147A  ALA*     1.3    82.0    -      -       +      +
    149A  VAL*     1.3    67.0    +      -       +      +
    151A  SER*     3.6     4.7    -      -       -      -
    152A  PHE*     2.9    25.4    +      -       -      +
----------------------------------------------------------
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Residues in contact with VAL 149 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    145A  ALA*     3.0    27.4    +      -       +      +
    146A  ALA*     4.1     3.6    -      -       -      +
    148A  TRP*     1.3    75.9    -      -       +      +
    150A  LEU*     1.3    58.7    +      -       +      +
    152A  PHE*     3.4     7.2    +      -       +      +
    153A  ILE*     2.9    54.2    +      -       +      +
----------------------------------------------------------
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Residues in contact with LEU 150 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    112A  MET*     4.4    23.3    -      -       +      -
    146A  ALA*     2.8    28.8    +      -       +      +
    147A  ALA      3.9     1.6    -      -       -      +
    149A  VAL*     1.3    72.6    -      -       +      +
    151A  SER*     1.3    65.4    +      -       -      +
    153A  ILE*     3.2    20.5    +      -       +      +
    154A  LEU*     3.1    35.6    +      -       +      +
----------------------------------------------------------
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Residues in contact with SER 151 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    105A  VAL*     3.6    22.9    -      -       -      -
    108A  ASN*     2.6    34.4    +      -       -      +
    109A  ALA*     3.3    13.8    +      -       -      -
    112A  MET*     3.7     3.2    -      -       -      -
    147A  ALA      2.7    22.8    +      -       -      -
    148A  TRP      3.6     4.3    -      -       -      -
    150A  LEU*     1.3    75.9    -      -       -      +
    152A  PHE*     1.3    62.9    +      -       -      +
    154A  LEU*     3.0    15.8    +      -       -      +
    155A  TRP*     3.1    17.1    +      -       -      +
----------------------------------------------------------
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Residues in contact with PHE 152 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    105A  VAL*     3.7    23.9    -      -       +      +
    148A  TRP      2.9    16.0    +      -       -      +
    149A  VAL*     3.6     6.7    -      -       +      +
    151A  SER*     1.3    76.5    -      -       -      +
    153A  ILE*     1.3    78.0    +      -       +      +
    154A  LEU      3.1     0.3    +      -       -      -
    156A  ALA*     2.9    50.6    +      -       +      +
    157A  PRO*     3.2     9.8    -      -       +      +
----------------------------------------------------------
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Residues in contact with ILE 153 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    149A  VAL*     2.9    42.0    +      -       +      +
    150A  LEU*     3.5    19.3    -      -       +      +
    152A  PHE*     1.3    87.0    -      -       +      +
    154A  LEU*     1.3    67.5    +      -       +      +
    157A  PRO*     3.1    23.2    -      -       +      +
----------------------------------------------------------
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Residues in contact with LEU 154 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    108A  ASN*     4.5    10.3    -      -       -      +
    112A  MET*     4.4    21.1    -      -       +      -
    150A  LEU*     3.1    25.5    +      -       +      +
    151A  SER      3.0     8.1    +      -       -      +
    153A  ILE*     1.3    84.4    -      -       +      +
    155A  TRP*     1.3    71.5    +      -       +      +
    157A  PRO*     4.2     1.0    -      -       -      +
    158A  ALA*     3.9    15.1    +      -       -      +
----------------------------------------------------------
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Residues in contact with TRP 155 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    104A  TYR*     3.5    38.9    +      +       +      -
    105A  VAL*     3.6    17.3    -      -       +      +
    108A  ASN*     3.0    35.7    +      -       +      +
    151A  SER      3.1    10.8    +      -       -      -
    154A  LEU*     1.3    85.5    -      -       +      +
    156A  ALA*     1.3    67.6    +      -       -      +
    158A  ALA*     3.2     5.5    +      -       +      +
    159A  ILE*     2.9    51.4    +      -       +      +
    178A  ILE*     4.6     3.1    -      -       +      -
    180A  PHE*     4.7    10.3    -      +       -      -
    181A  PHE*     4.1    10.5    -      +       -      -
    190A  THR*     3.3    30.7    -      -       +      -
    194A  ALA*     4.0    16.2    -      -       +      -
   1162A  QNB      3.6    23.0    -      +       -      -
----------------------------------------------------------
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Residues in contact with ALA 156 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    101A  ALA*     4.4     7.9    -      -       +      -
    105A  VAL*     3.7     8.8    -      -       +      +
    152A  PHE*     2.9    50.3    +      -       +      +
    155A  TRP*     1.3    74.1    -      -       -      +
    157A  PRO*     1.3    71.3    -      -       +      +
    160A  LEU*     3.0    41.2    +      -       +      +
----------------------------------------------------------
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Residues in contact with PRO 157 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    152A  PHE*     3.2    11.7    -      -       +      +
    153A  ILE*     3.1    32.5    -      -       +      +
    154A  LEU      5.1     0.2    -      -       -      +
    155A  TRP      3.6     2.0    -      -       -      -
    156A  ALA*     1.3    91.9    -      -       +      +
    158A  ALA*     1.3    56.9    +      -       -      +
    161A  PHE*     2.9    56.7    +      -       +      +
    165A  ILE*     5.3     1.1    -      -       -      +
----------------------------------------------------------
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Residues in contact with ALA 158 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    154A  LEU      3.9    13.1    +      -       -      +
    155A  TRP*     3.2     8.2    +      -       +      +
    157A  PRO*     1.3    79.7    -      -       -      +
    159A  ILE*     1.3    60.9    +      -       -      +
    162A  TRP*     2.9    44.3    +      -       +      +
    165A  ILE*     5.3     5.2    -      -       -      -
    180A  PHE*     3.8    19.9    -      -       +      -
----------------------------------------------------------
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Residues in contact with ILE 159 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     97A  ASP*     4.0    15.3    -      -       -      +
    100A  LEU*     4.1    13.9    -      -       +      +
    101A  ALA*     3.7    31.6    -      -       -      +
    104A  TYR*     3.9    23.6    -      -       +      -
    155A  TRP*     2.9    38.7    +      -       +      +
    156A  ALA      3.8     2.5    -      -       -      +
    158A  ALA*     1.3    78.9    -      -       -      +
    160A  LEU*     1.3    73.1    +      -       +      +
    162A  TRP*     4.3     5.0    +      -       -      +
    163A  GLN*     5.4     0.7    +      -       -      +
    178A  ILE*     4.1    23.3    -      -       +      -
    179A  GLN*     5.8     3.3    +      -       -      +
    180A  PHE*     4.2    12.7    -      -       +      -
----------------------------------------------------------
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Residues in contact with LEU 160 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     97A  ASP*     3.7    25.7    -      -       +      +
     98A  LEU*     4.1    21.5    -      -       +      -
    101A  ALA*     3.2    33.2    -      -       +      -
    156A  ALA*     3.0    23.4    +      -       +      +
    157A  PRO      4.3     0.4    -      -       -      +
    159A  ILE*     1.3    80.2    -      -       +      +
    161A  PHE*     1.3    87.3    +      -       +      +
    162A  TRP      3.5     0.2    -      -       -      -
    163A  GLN*     3.1    29.0    +      -       -      +
    164A  PHE*     4.1     0.9    -      -       -      -
----------------------------------------------------------
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Residues in contact with PHE 161 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    157A  PRO*     2.9    36.3    +      -       +      +
    160A  LEU*     1.3    97.9    -      -       +      +
    162A  TRP*     1.3    66.2    +      -       -      +
    163A  GLN      3.2     3.4    -      -       -      -
    164A  PHE*     3.1    29.6    +      +       +      +
    165A  ILE*     2.9    31.1    +      -       +      +
----------------------------------------------------------
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Residues in contact with TRP 162 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    158A  ALA*     2.9    29.3    +      -       +      +
    159A  ILE      4.3     4.9    +      -       -      +
    160A  LEU      3.5     1.2    -      -       -      -
    161A  PHE*     1.3    77.1    -      -       -      +
    163A  GLN*     1.3    63.1    +      -       -      +
    165A  ILE*     3.1    29.2    +      -       +      +
    166A  VAL*     3.0    44.7    +      -       +      +
    179A  GLN*     3.9    34.6    +      -       +      +
    180A  PHE*     3.6    46.5    -      +       +      +
----------------------------------------------------------
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Residues in contact with GLN 163 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     97A  ASP*     3.4    21.4    +      -       -      -
    159A  ILE      5.4     0.6    +      -       -      +
    160A  LEU      3.1    23.9    +      -       -      +
    162A  TRP*     1.3    80.0    -      -       -      +
    164A  PHE*     1.3    86.0    +      -       +      +
    166A  VAL      3.5     0.2    +      -       -      -
    167A  GLY*     2.6    31.4    +      -       -      -
    168A  VAL      3.1    24.7    +      -       -      +
    169A  ARG*     3.2    33.9    +      -       +      +
    179A  GLN*     3.5    22.0    -      -       -      +
----------------------------------------------------------
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Residues in contact with PHE 164 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    160A  LEU      4.1     3.6    -      -       -      -
    161A  PHE*     3.1    34.5    +      +       +      +
    163A  GLN*     1.3   105.0    -      -       +      +
    165A  ILE*     1.3    67.8    +      -       +      +
    167A  GLY*     3.3    12.7    +      -       -      -
----------------------------------------------------------
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Residues in contact with ILE 165 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    157A  PRO      5.3     0.4    -      -       -      +
    158A  ALA*     5.2     6.7    -      -       -      +
    161A  PHE*     2.9    29.2    +      -       +      +
    162A  TRP*     3.1    34.7    +      -       +      +
    164A  PHE*     1.3    80.0    -      -       +      +
    166A  VAL*     1.3    66.7    +      -       +      +
----------------------------------------------------------
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Residues in contact with VAL 166 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    162A  TRP*     3.0    50.4    +      -       +      +
    163A  GLN      4.2     2.0    -      -       -      +
    165A  ILE*     1.3    80.8    -      -       +      +
    167A  GLY*     1.3    58.4    +      -       -      +
    168A  VAL*     3.3    26.0    +      -       +      +
    179A  GLN*     5.1     1.3    -      -       -      +
----------------------------------------------------------
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Residues in contact with GLY 167 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    163A  GLN      2.6    18.0    +      -       -      -
    164A  PHE*     3.3    13.8    +      -       -      -
    166A  VAL*     1.3    73.5    -      -       -      +
    168A  VAL*     1.3    57.2    +      -       -      +
----------------------------------------------------------
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A short description of the analytical approach
The contact analysis used in this page is based upon the approach developed in: Sobolev V., Wade R.C., Vriend G. and Edelman M. PROTEINS (1996) 25, 120-129. Contact legitimacy depends on the hydrophobic-hydrophilic properties of the contacting atoms. In order to define it, for each inter-atomic contact, eight atom classes have been introduced:


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

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

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