Contacts of the helix formed by residues 130 - 155 (chain A) in PDB entry 6GA6


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 VAL 130 (chain A).
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    128A  THR*     3.4    14.2    -      -       +      +
    129A  LYS*     1.3    79.2    -      -       +      +
    131A  TYR*     1.3    66.3    +      -       -      +
    132A  SER*     3.9    12.6    -      -       -      +
    133A  TYR*     3.0    53.8    +      -       +      -
    134A  ARG*     3.4     1.5    +      -       -      +
----------------------------------------------------------
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Residues in contact with TYR 131 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     71A  PHE*     3.5    36.3    -      +       +      -
     72A  GLY*     4.8    10.8    -      -       -      +
    129A  LYS      3.4     5.6    +      -       -      -
    130A  VAL*     1.3    72.5    -      -       -      +
    132A  SER*     1.3    63.3    +      -       -      +
    134A  ARG*     3.1    31.2    +      -       -      +
    135A  PHE*     3.4    26.4    -      +       -      -
    195A  GLY      3.0    27.1    +      -       -      -
    196A  ALA*     3.4     8.0    +      -       -      -
    309A  UND      3.9    19.5    -      -       +      -
    310A  L2P      3.2    31.3    -      -       -      -
----------------------------------------------------------
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Residues in contact with SER 132 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    130A  VAL*     3.9     7.6    -      -       -      +
    131A  TYR*     1.3    80.3    -      -       -      +
    133A  TYR*     1.3    80.8    +      -       -      +
    135A  PHE*     3.3    19.9    +      -       -      +
    136A  VAL*     3.8     7.6    +      -       -      +
    309A  UND      3.8    40.1    -      -       -      +
----------------------------------------------------------
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Residues in contact with TYR 133 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    128A  THR*     3.7    10.8    -      -       +      -
    130A  VAL*     3.0    40.1    +      -       +      +
    132A  SER*     1.3    88.5    +      -       -      +
    134A  ARG*     1.3    66.0    +      -       -      +
    135A  PHE      3.1     2.9    -      -       -      -
    136A  VAL*     3.0    25.7    +      -       +      +
    137A  TRP*     3.1    24.5    +      -       +      +
----------------------------------------------------------
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Residues in contact with ARG 134 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     69A  VAL*     4.1     0.8    -      -       -      +
     71A  PHE*     3.3    30.1    -      -       -      -
     78A  ILE*     3.7     3.8    -      -       -      +
    125A  GLY*     3.2    23.9    +      -       -      +
    126A  ALA*     2.8    37.6    +      -       -      +
    127A  LEU      4.0     0.6    -      -       -      -
    128A  THR*     2.8    37.0    +      -       +      +
    130A  VAL      3.7     4.3    -      -       -      +
    131A  TYR*     3.1    34.5    +      -       -      +
    133A  TYR*     1.3    77.4    -      -       -      +
    135A  PHE*     1.3    62.0    +      -       +      +
    137A  TRP*     3.3     5.5    +      -       -      +
    138A  TRP*     3.0    23.2    +      -       -      +
    189A  TRP*     3.8    13.2    -      -       +      -
    194A  GLU*     2.9    44.1    +      -       -      +
----------------------------------------------------------
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Residues in contact with PHE 135 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    131A  TYR*     3.4    61.2    -      +       -      -
    132A  SER*     3.7    12.1    -      -       -      +
    133A  TYR      3.1     0.8    -      -       -      -
    134A  ARG*     1.3    77.4    -      -       +      +
    136A  VAL*     1.3    65.0    +      -       -      +
    137A  TRP      3.3     0.2    -      -       -      -
    138A  TRP*     3.6     7.9    -      -       +      +
    139A  ALA*     3.0    23.4    +      -       -      +
    189A  TRP*     4.7     4.9    -      +       -      -
    190A  LEU*     3.7    31.9    -      -       +      -
    195A  GLY*     3.8    23.8    -      -       -      -
    196A  ALA*     4.1     2.0    -      -       +      -
    309A  UND      3.9    27.7    -      -       +      +
    310A  L2P      3.8    34.3    -      -       +      -
----------------------------------------------------------
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Residues in contact with VAL 136 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    132A  SER      4.0    10.3    -      -       -      +
    133A  TYR*     3.0    25.5    +      -       +      +
    135A  PHE*     1.3    78.2    -      -       -      +
    137A  TRP*     1.3    70.1    +      -       +      +
    139A  ALA*     3.2     7.4    +      -       +      +
    140A  ILE*     3.1    37.7    +      -       +      +
    309A  UND      4.6    16.6    -      -       +      -
----------------------------------------------------------
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Residues in contact with TRP 137 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    121A  THR*     3.5    48.0    +      -       +      +
    122A  GLY*     5.7     0.2    -      -       -      -
    124A  VAL*     3.4    28.1    -      -       +      +
    125A  GLY*     3.5    15.7    -      -       -      -
    128A  THR*     3.7    21.3    +      -       -      +
    133A  TYR*     3.1    32.6    +      -       -      +
    134A  ARG      3.7     0.9    -      -       -      +
    136A  VAL*     1.3    81.1    -      -       +      +
    138A  TRP*     1.3    66.0    +      -       -      +
    140A  ILE*     3.3    20.1    +      -       +      +
    141A  SER*     2.9    25.9    +      -       -      -
----------------------------------------------------------
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Residues in contact with TRP 138 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    122A  GLY*     6.0     0.7    -      -       -      -
    134A  ARG      3.0    15.4    +      -       -      +
    135A  PHE*     3.6    14.6    -      -       -      +
    136A  VAL      3.3     0.2    -      -       -      -
    137A  TRP*     1.3    76.3    -      -       -      +
    139A  ALA*     1.3    66.0    +      -       +      +
    141A  SER*     3.3     5.8    +      -       -      -
    142A  THR*     2.9    56.7    +      -       +      -
    186A  PRO*     3.0    31.5    +      -       +      +
    187A  VAL*     5.5     0.7    -      -       +      -
    189A  TRP*     3.3    29.3    -      +       +      -
    190A  LEU*     3.9    29.7    -      -       +      +
    301A  RET      3.2    31.8    -      -       +      +
    303A  TRD      4.5    13.9    -      -       +      -
    309A  UND      5.9     0.2    -      -       +      -
    310A  L2P      3.6    52.7    -      -       +      -
----------------------------------------------------------
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Residues in contact with ALA 139 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    135A  PHE      3.0    17.6    +      -       -      +
    136A  VAL*     3.5     5.4    -      -       +      +
    137A  TRP      3.2     0.2    -      -       -      -
    138A  TRP*     1.3    89.8    -      -       +      +
    140A  ILE*     1.3    58.1    +      -       +      +
    142A  THR*     3.3     2.2    +      -       -      -
    143A  ALA*     2.9    28.6    +      -       -      +
    309A  UND      3.8    29.2    -      -       +      -
    310A  L2P      3.7    21.5    -      -       +      +
----------------------------------------------------------
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Residues in contact with ILE 140 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    117A  ILE*     4.8     4.3    -      -       +      -
    121A  THR*     4.1    20.0    -      -       +      +
    136A  VAL*     3.1    28.6    +      -       +      +
    137A  TRP*     3.8    28.5    -      -       +      +
    139A  ALA*     1.3    76.2    -      -       +      +
    141A  SER*     1.3    64.3    +      -       -      +
    143A  ALA*     3.2     9.1    +      -       -      +
    144A  ALA*     3.1    19.8    +      -       -      +
    302A  L2P      4.2    35.1    -      -       +      +
    310A  L2P      5.8     0.2    -      -       -      -
----------------------------------------------------------
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Residues in contact with SER 141 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    118A  MET*     2.7    30.6    +      -       -      +
    121A  THR*     3.1    21.5    +      -       -      -
    122A  GLY*     4.0     7.6    +      -       -      -
    137A  TRP      2.9    15.6    +      -       -      -
    138A  TRP      3.7     0.4    -      -       -      -
    140A  ILE*     1.3    76.0    -      -       -      +
    142A  THR*     1.3    57.1    +      -       -      +
    144A  ALA*     3.1     6.1    +      -       -      +
    145A  MET*     2.9    23.4    +      -       -      +
    301A  RET      3.1    31.1    -      -       -      +
----------------------------------------------------------
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Residues in contact with THR 142 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    138A  TRP*     2.9    46.1    +      -       +      -
    139A  ALA*     3.7     6.3    -      -       -      -
    141A  SER*     1.3    74.1    -      -       -      +
    143A  ALA*     1.3    58.6    +      -       -      +
    145A  MET*     3.1     5.8    +      -       +      +
    146A  LEU*     2.8    37.7    +      -       +      +
    186A  PRO*     3.8     1.7    -      -       +      +
    301A  RET      3.6    18.2    -      -       -      +
    303A  TRD      4.4    26.9    -      -       +      -
    310A  L2P      4.5    15.9    -      -       +      -
----------------------------------------------------------
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Residues in contact with ALA 143 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    139A  ALA      2.9    14.2    +      -       -      +
    140A  ILE*     3.2    12.1    +      -       -      +
    142A  THR*     1.3    77.9    -      -       -      +
    144A  ALA*     1.3    60.9    +      -       -      +
    146A  LEU*     3.3     8.3    +      -       -      +
    147A  TYR*     3.0    21.7    +      -       -      +
    302A  L2P      4.3    14.8    -      -       +      -
    310A  L2P      3.8    28.2    -      -       +      +
    315A  UND      3.9    18.7    -      -       +      +
----------------------------------------------------------
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Residues in contact with ALA 144 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    114A  ALA*     3.7    23.0    -      -       -      +
    117A  ILE*     4.2     7.0    -      -       +      -
    118A  MET*     3.9    13.5    -      -       +      +
    140A  ILE      3.1    12.9    +      -       -      +
    141A  SER      3.1     8.7    +      -       -      +
    143A  ALA*     1.3    73.1    -      -       -      +
    145A  MET*     1.3    65.0    +      -       -      +
    147A  TYR*     3.3     6.7    +      -       -      +
    148A  ILE*     3.1    28.1    +      -       -      +
    302A  L2P      3.9    21.4    -      -       +      +
----------------------------------------------------------
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Residues in contact with MET 145 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    118A  MET*     3.5    27.0    -      -       +      -
    141A  SER      2.9     9.4    +      -       -      +
    142A  THR*     3.1     9.8    +      -       +      +
    144A  ALA*     1.3    76.9    -      -       -      +
    146A  LEU*     1.3    64.4    +      -       +      +
    148A  ILE*     3.0     6.8    +      -       +      +
    149A  LEU*     2.8    60.2    +      -       +      +
    182A  TRP*     3.7    29.4    -      -       +      +
    183A  SER*     4.1     5.4    -      -       -      -
    186A  PRO*     3.8    16.8    -      -       +      -
    301A  RET      3.9    13.0    -      -       +      -
    303A  TRD      3.8    33.0    -      -       +      -
----------------------------------------------------------
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Residues in contact with LEU 146 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    142A  THR*     2.8    25.5    +      -       +      +
    143A  ALA*     3.3     8.3    +      -       -      +
    145A  MET*     1.3    85.2    -      -       +      +
    147A  TYR*     1.3    57.7    +      -       -      +
    149A  LEU*     3.3     4.5    +      -       +      +
    150A  TYR*     2.9    28.9    +      -       -      +
    303A  TRD      3.7    58.2    -      -       +      +
    310A  L2P      4.0    27.8    -      -       +      -
    315A  UND      4.7    11.7    -      -       +      -
----------------------------------------------------------
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Residues in contact with TYR 147 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    110A  ALA*     3.7    20.3    -      -       +      +
    111A  LEU*     5.0     1.3    -      -       -      -
    114A  ALA*     3.7    17.0    -      -       +      -
    143A  ALA      3.0     9.1    +      -       -      +
    144A  ALA      3.5     7.6    -      -       -      +
    145A  MET      3.2     0.2    -      -       -      -
    146A  LEU*     1.3    73.9    -      -       -      +
    148A  ILE*     1.3    68.9    +      -       -      +
    150A  TYR*     3.2     4.1    +      +       -      +
    151A  VAL*     3.0    47.4    +      -       +      +
    302A  L2P      3.0    81.0    -      -       +      +
    315A  UND      4.0    53.0    -      -       +      +
----------------------------------------------------------
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Residues in contact with ILE 148 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     94A  LEU*     4.1    20.0    -      -       +      -
    111A  LEU*     3.8    25.4    -      -       +      +
    114A  ALA*     3.9    14.8    -      -       +      -
    115A  ASP*     3.5    42.6    -      -       +      +
    118A  MET*     4.1    18.2    -      -       +      -
    144A  ALA      3.1    14.2    +      -       -      +
    145A  MET*     3.0     7.7    +      -       +      +
    147A  TYR*     1.3    75.3    -      -       -      +
    149A  LEU*     1.3    69.3    +      -       +      +
    151A  VAL*     3.2     4.3    +      -       -      +
    152A  LEU*     3.0    30.0    +      -       +      +
    182A  TRP*     4.6     7.6    -      -       +      -
----------------------------------------------------------
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Residues in contact with LEU 149 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    145A  MET*     2.8    42.0    +      -       +      +
    146A  LEU*     3.8     4.7    -      -       +      +
    148A  ILE*     1.3    81.1    -      -       +      +
    150A  TYR*     1.3    62.8    +      -       -      +
    152A  LEU*     3.3    13.4    +      -       +      +
    153A  PHE*     3.2    29.7    +      -       -      -
    178A  THR*     5.2     0.7    -      -       +      +
    179A  VAL*     4.0    31.6    -      -       +      +
    182A  TRP*     5.0    11.0    -      -       +      -
    183A  SER*     3.5    24.5    -      -       -      +
    303A  TRD      3.5    36.1    -      -       +      -
----------------------------------------------------------
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Residues in contact with TYR 150 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    146A  LEU      2.9    18.1    +      -       -      +
    147A  TYR*     3.2     8.5    +      +       -      +
    149A  LEU*     1.3    76.8    -      -       -      +
    151A  VAL*     1.3    65.4    +      -       +      +
    153A  PHE      3.1     1.2    +      -       -      -
    154A  PHE*     2.7    83.7    +      +       +      +
    303A  TRD      4.0    18.5    -      -       +      +
    315A  UND      3.8    57.1    -      -       +      +
----------------------------------------------------------
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Residues in contact with VAL 151 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    107A  THR*     3.8    29.2    -      -       +      -
    110A  ALA*     5.8     0.9    -      -       +      -
    111A  LEU*     4.0    21.5    -      -       +      -
    147A  TYR*     3.0    53.3    +      -       +      +
    148A  ILE      3.7     7.2    -      -       -      +
    150A  TYR*     1.3    83.8    -      -       +      +
    152A  LEU*     1.3    63.6    +      -       -      +
    154A  PHE      4.9     0.2    -      -       -      -
    155A  GLY*     3.0    25.2    +      -       -      +
    156A  PHE*     3.2    11.4    +      -       +      +
    302A  L2P      6.2     1.8    -      -       -      -
    315A  UND      5.5     2.2    -      -       +      -
----------------------------------------------------------
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Residues in contact with LEU 152 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     94A  LEU*     4.3     5.8    -      -       +      -
     97A  LEU*     4.2    20.6    -      -       +      -
    111A  LEU*     4.4    13.0    -      -       +      -
    148A  ILE*     3.0    33.5    +      -       +      +
    149A  LEU*     3.7    17.0    -      -       +      +
    150A  TYR      3.3     0.2    -      -       -      -
    151A  VAL*     1.3    75.9    -      -       -      +
    153A  PHE*     1.3    61.4    +      -       +      +
    156A  PHE*     3.5    42.9    -      -       +      +
    157A  THR*     3.4    12.8    +      -       -      -
    171A  PHE*     3.8     2.8    -      -       +      -
    175A  ARG*     3.5    19.5    -      -       +      -
    178A  THR*     4.1    26.2    -      -       +      -
    179A  VAL*     4.7     4.9    -      -       +      -
    182A  TRP*     6.1     0.2    -      -       +      -
----------------------------------------------------------
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Residues in contact with PHE 153 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    149A  LEU      3.2    20.2    +      -       -      +
    150A  TYR      3.1     1.0    +      -       -      -
    151A  VAL      3.1     0.6    -      -       -      -
    152A  LEU*     1.3    82.6    -      -       -      +
    154A  PHE*     1.3    89.0    +      +       +      +
    155A  GLY      3.4     3.3    +      -       -      -
    157A  THR*     3.4    22.0    +      -       -      +
    158A  SER*     4.8     3.1    +      -       -      -
    175A  ARG*     3.6    39.0    -      -       -      -
    176A  ASN*     4.3     7.2    -      -       -      -
    179A  VAL*     3.3    41.1    -      -       +      -
    303A  TRD      4.1    15.5    -      -       +      -
    307A  OCT      5.6     5.4    -      -       +      -
----------------------------------------------------------
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Residues in contact with PHE 154 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    150A  TYR*     2.7    71.0    +      +       +      +
    151A  VAL*     4.7     0.9    -      -       -      -
    153A  PHE*     1.3    93.9    -      +       +      +
    155A  GLY*     1.3    55.6    +      -       -      +
    158A  SER*     5.9     4.7    -      -       -      -
    303A  TRD      4.4    17.0    -      -       +      -
----------------------------------------------------------
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Residues in contact with GLY 155 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    107A  THR*     6.0     1.3    -      -       -      -
    151A  VAL*     3.0    15.4    +      -       -      -
    153A  PHE      3.8     0.2    +      -       -      -
    154A  PHE*     1.3    78.5    -      -       -      +
    156A  PHE*     1.3    72.6    +      -       -      +
    157A  THR      3.9     0.2    -      -       -      -
    158A  SER*     4.9     5.2    -      -       -      -
    159A  LYS*     3.9    13.2    +      -       -      +
----------------------------------------------------------
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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