Contacts of the helix formed by residues 205 - 230 (chain A) in PDB entry 1VGO


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 GLY 205 (chain A).
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    198A  THR*     3.9     3.4    -      -       -      -
    203A  VAL      4.3     1.0    +      -       -      -
    204A  VAL*     1.3    80.0    -      -       -      +
    206A  LEU*     1.3    66.2    +      -       -      -
    207A  GLY      3.1     3.8    +      -       -      -
    208A  ILE*     3.3     6.9    +      -       -      +
    209A  GLU*     3.0    20.8    +      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 206 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     13A  GLU*     3.9    30.5    -      -       +      +
     82A  ASP*     6.1     5.2    -      -       +      -
     84A  TYR*     5.5    11.2    -      -       +      -
     87A  ARG*     6.2     2.5    -      -       -      +
    198A  THR*     3.5    28.9    -      -       +      +
    205A  GLY*     1.3    70.8    -      -       -      -
    207A  GLY*     1.3    59.9    +      -       -      +
    209A  GLU*     3.9    10.3    -      -       +      +
    210A  THR*     2.8    44.3    +      -       -      +
----------------------------------------------------------
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Residues in contact with GLY 207 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     12A  PRO*     6.1     3.8    -      -       -      -
     13A  GLU*     4.5    13.9    +      -       -      -
     16A  TRP*     3.3    22.4    +      -       -      -
    205A  GLY      3.1     1.6    +      -       -      -
    206A  LEU*     1.3    77.6    -      -       -      +
    208A  ILE*     1.3    64.2    +      -       -      +
    210A  THR*     3.5     0.3    +      -       -      -
    211A  LEU*     3.1    15.9    +      -       -      +
----------------------------------------------------------
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Residues in contact with ILE 208 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     16A  TRP*     6.2     0.7    -      -       +      +
    204A  VAL*     3.5    23.3    -      -       +      -
    205A  GLY*     3.3     6.0    +      -       -      +
    207A  GLY*     1.3    73.5    -      -       -      +
    209A  GLU*     1.3    56.0    +      -       -      +
    211A  LEU*     2.9    18.5    +      -       +      +
    212A  ALA*     2.6    35.0    +      -       +      +
    306A  BNG      3.6    57.7    -      -       -      +
    308A  BNG      6.1     1.6    -      -       -      -
----------------------------------------------------------
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Residues in contact with GLU 209 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     87A  ARG*     4.2     3.3    +      -       -      -
    193A  LEU*     3.7    26.5    -      -       +      +
    197A  GLY*     3.3     3.7    -      -       -      -
    198A  THR*     2.6    42.4    +      -       -      +
    199A  GLU*     2.7    34.6    -      -       -      +
    204A  VAL*     3.6     9.0    -      -       +      +
    205A  GLY      3.0    15.9    +      -       -      +
    206A  LEU*     3.8    10.8    -      -       +      +
    208A  ILE*     1.3    76.0    -      -       -      +
    210A  THR*     1.3    56.9    +      -       -      +
    212A  ALA*     3.1     3.5    +      -       -      +
    213A  PHE*     2.8    50.9    +      -       +      -
----------------------------------------------------------
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Residues in contact with THR 210 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     13A  GLU*     3.8    19.2    -      -       +      +
     16A  TRP*     3.8    17.5    -      -       +      -
     17A  LEU*     3.8    29.6    -      -       +      -
     61A  TYR*     5.2     0.3    +      -       -      -
     84A  TYR*     5.9     1.4    -      -       -      -
     87A  ARG*     4.7    12.6    +      -       -      +
    206A  LEU*     2.8    34.1    +      -       -      +
    207A  GLY      3.8     4.3    -      -       -      -
    209A  GLU*     1.3    74.0    -      -       -      +
    211A  LEU*     1.3    66.0    +      -       -      +
    213A  PHE*     3.9     6.0    -      -       -      +
    214A  MET*     3.0    24.0    +      -       +      +
----------------------------------------------------------
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Residues in contact with LEU 211 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     16A  TRP*     3.8    53.3    -      -       +      -
    207A  GLY      3.1    14.1    +      -       -      +
    208A  ILE*     2.9    29.3    +      -       +      +
    210A  THR*     1.3    76.0    -      -       -      +
    212A  ALA*     1.3    63.7    +      -       -      +
    214A  MET*     3.4    11.9    +      -       +      +
    215A  VAL*     3.1    36.8    +      -       +      +
    306A  BNG      4.3    23.1    -      -       -      +
    308A  BNG      4.6    20.9    -      -       -      +
----------------------------------------------------------
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Residues in contact with ALA 212 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    193A  LEU*     3.7    23.3    -      -       +      -
    208A  ILE*     2.6    19.9    +      -       +      +
    209A  GLU*     3.4     5.2    -      -       -      +
    211A  LEU*     1.3    74.8    -      -       -      +
    213A  PHE*     1.3    56.1    +      -       -      +
    215A  VAL*     3.3     2.9    +      -       -      +
    216A  LEU*     2.9    33.1    +      -       +      +
    306A  BNG      4.0    37.5    -      -       +      +
----------------------------------------------------------
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Residues in contact with PHE 213 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     61A  TYR*     3.9     3.6    -      -       -      +
     87A  ARG*     3.7    35.7    -      -       -      +
     91A  TRP*     3.9    15.9    -      +       -      -
    190A  TYR*     3.5    48.9    -      +       -      -
    193A  LEU*     3.5    32.1    -      -       +      -
    194A  TRP*     4.5    13.7    -      +       +      -
    199A  GLU*     4.8     2.2    -      -       -      -
    209A  GLU*     2.8    49.2    +      -       +      +
    210A  THR*     4.0     4.0    -      -       +      +
    212A  ALA*     1.3    71.3    -      -       -      +
    214A  MET*     1.3    56.5    +      -       -      +
    216A  LEU*     3.7     3.0    -      -       +      +
    217A  ASP*     2.7    45.9    +      -       -      +
    260A  RET      5.0     0.4    -      -       +      -
----------------------------------------------------------
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Residues in contact with MET 214 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     16A  TRP*     3.4    33.7    -      -       +      +
     19A  ILE*     3.9    21.8    -      -       +      -
     20A  GLY*     3.7    17.0    -      -       -      -
     23A  LEU*     4.1    22.9    -      -       +      -
     24A  MET*     5.4     0.5    -      -       -      +
     61A  TYR*     3.3    17.9    +      -       +      +
    210A  THR*     3.0    18.4    +      -       +      +
    211A  LEU*     3.5    25.4    -      -       +      +
    213A  PHE*     1.3    74.8    -      -       -      +
    215A  VAL*     1.3    72.8    +      -       +      +
    217A  ASP*     3.9     0.5    -      -       -      +
    218A  VAL*     3.0    30.9    +      -       -      +
----------------------------------------------------------
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Residues in contact with VAL 215 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    211A  LEU*     3.1    28.6    +      -       +      +
    212A  ALA      3.6     7.2    -      -       -      +
    214A  MET*     1.3    86.7    -      -       +      +
    216A  LEU*     1.3    63.3    +      -       +      +
    218A  VAL*     3.0    16.0    -      -       +      +
    219A  THR*     2.8    29.0    +      -       -      +
    306A  BNG      4.2    28.3    -      -       +      -
    308A  BNG      4.1    33.9    -      -       +      -
----------------------------------------------------------
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Residues in contact with LEU 216 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    186A  LEU*     4.2    22.4    -      -       +      +
    189A  ALA*     3.7    38.8    -      -       +      -
    190A  TYR*     3.4    18.6    -      -       +      +
    193A  LEU*     3.7    29.8    -      -       +      -
    212A  ALA*     2.9    16.5    +      -       +      +
    213A  PHE*     3.7    10.5    -      -       +      +
    215A  VAL*     1.3    78.1    -      -       +      +
    217A  ASP*     1.3    62.9    +      -       -      +
    219A  THR*     3.9     4.2    -      -       -      -
    220A  ALA*     2.9    27.7    +      -       -      +
    306A  BNG      4.4    24.5    -      -       +      -
----------------------------------------------------------
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Residues in contact with ASP 217 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     24A  MET*     3.8    15.0    -      -       +      -
     61A  TYR*     2.8    31.8    +      -       -      +
     87A  ARG*     5.5     2.3    +      -       -      +
     90A  ASP*     4.9     0.6    -      -       -      +
     91A  TRP*     3.2    31.7    +      -       -      -
    190A  TYR*     2.7    28.7    +      -       -      -
    213A  PHE*     2.7    25.8    +      -       -      +
    214A  MET      3.9     1.1    -      -       -      +
    216A  LEU*     1.3    73.4    -      -       -      +
    218A  VAL*     1.3    61.9    +      -       -      +
    220A  ALA*     3.8     0.8    -      -       -      -
    221A  LYS*     3.1    36.6    +      -       -      +
    260A  RET      3.4     3.8    -      -       -      +
----------------------------------------------------------
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Residues in contact with VAL 218 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     20A  GLY*     6.3     0.9    -      -       -      -
     23A  LEU*     4.1    31.4    -      -       +      -
     24A  MET*     3.9    14.1    -      -       +      +
    214A  MET*     3.0    23.9    +      -       -      +
    215A  VAL*     3.0    22.9    -      -       +      +
    217A  ASP*     1.3    76.7    -      -       -      +
    219A  THR*     1.3    61.2    +      -       -      +
    222A  VAL*     2.8    46.6    +      -       +      -
    223A  GLY      3.1     4.7    +      -       -      -
----------------------------------------------------------
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Residues in contact with THR 219 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    182A  LEU*     5.0     6.2    -      -       +      +
    186A  LEU*     3.7    28.6    -      -       +      +
    215A  VAL*     2.8    23.3    +      -       -      +
    216A  LEU*     3.9     3.1    -      -       -      -
    218A  VAL*     1.3    82.0    -      -       -      +
    220A  ALA*     1.3    57.7    +      -       -      +
    221A  LYS      3.2     0.2    -      -       -      -
    223A  GLY*     3.0    13.7    -      -       -      +
    224A  PHE*     2.8    26.9    +      -       -      -
    308A  BNG      3.8    29.4    -      -       +      +
----------------------------------------------------------
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Residues in contact with ALA 220 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     98A  LEU*     3.7    17.8    -      -       -      +
    186A  LEU*     3.6    21.7    -      -       +      +
    187A  TRP*     4.5     8.0    +      -       +      +
    190A  TYR*     4.0    11.7    -      -       +      +
    216A  LEU      2.9    17.9    +      -       -      +
    217A  ASP      4.0     3.6    -      -       -      +
    219A  THR*     1.3    77.2    -      -       -      +
    221A  LYS*     1.3    59.0    +      -       -      +
    224A  PHE*     3.2    19.4    -      -       -      +
    260A  RET      4.1    17.3    -      -       +      -
----------------------------------------------------------
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Residues in contact with LYS 221 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     24A  MET*     3.5    24.5    -      -       +      -
     31A  PHE*     4.0     5.5    -      -       -      -
     50A  THR*     4.9     1.9    -      -       -      +
     53A  VAL*     3.4    23.8    -      -       +      +
     54A  PRO*     4.6     8.9    -      -       -      +
     57A  ALA*     3.7    14.8    -      -       +      -
     90A  ASP*     3.7    17.8    +      -       -      -
     91A  TRP*     4.0     1.6    -      -       -      -
     94A  THR*     3.2    18.5    -      -       -      +
     98A  LEU*     4.8     1.4    -      -       -      +
    217A  ASP*     3.1    24.4    +      -       -      +
    218A  VAL      4.3     0.7    -      -       -      +
    219A  THR      3.2     0.2    -      -       -      -
    220A  ALA*     1.3    80.7    -      -       -      +
    222A  VAL*     1.3    62.8    +      -       +      +
    223A  GLY      3.5     0.4    -      -       -      -
    224A  PHE*     4.3     0.7    -      -       -      +
    225A  GLY*     3.0    24.4    +      -       -      -
    260A  RET      1.4    73.4    -      -       +      +
----------------------------------------------------------
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Residues in contact with VAL 222 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     23A  LEU      4.0    19.3    -      -       -      +
     24A  MET*     4.2     6.3    -      -       -      -
     27A  GLY*     4.1    20.4    -      -       -      -
     30A  TYR*     6.1     1.1    -      -       +      -
     31A  PHE*     3.5    14.3    -      -       +      -
     54A  PRO*     4.1    21.1    -      -       +      -
    218A  VAL*     2.8    27.2    +      -       +      +
    221A  LYS*     1.3    71.9    -      -       -      +
    223A  GLY*     1.3    60.9    -      -       -      +
    226A  PHE*     2.8    34.0    +      -       +      +
----------------------------------------------------------
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Residues in contact with GLY 223 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    182A  LEU*     4.7     2.2    -      -       -      -
    218A  VAL      3.1     5.7    +      -       -      -
    219A  THR*     3.0    21.6    +      -       -      -
    222A  VAL*     1.3    77.4    -      -       -      +
    224A  PHE*     1.3    62.7    +      -       -      +
    226A  PHE*     3.1     8.7    +      -       -      +
    227A  VAL*     3.1    28.0    +      -       -      +
----------------------------------------------------------
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Residues in contact with PHE 224 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     50A  THR*     5.8     0.4    -      -       +      -
     98A  LEU*     3.6    33.4    -      -       +      -
    101A  ASP*     4.4    19.5    -      -       +      -
    102A  LEU*     4.1    26.5    -      -       +      -
    179A  LEU*     3.7    38.5    -      -       +      +
    182A  LEU*     3.7    30.2    -      -       +      +
    183A  VAL*     3.8    17.5    -      -       +      -
    186A  LEU*     6.2     0.2    -      -       +      -
    187A  TRP*     5.7     2.5    -      -       -      -
    219A  THR      2.8     6.8    +      -       -      +
    220A  ALA*     3.2    26.7    -      -       -      +
    221A  LYS      4.1     0.4    +      -       -      +
    223A  GLY*     1.3    74.8    -      -       -      +
    225A  GLY*     1.3    69.2    +      -       -      +
    227A  VAL*     3.2     3.7    +      -       -      +
    228A  LEU*     3.1    23.4    +      -       +      +
----------------------------------------------------------
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Residues in contact with GLY 225 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     31A  PHE*     3.7     8.5    -      -       -      -
     50A  THR*     3.7    21.8    -      -       -      -
    221A  LYS      3.0    21.5    +      -       -      -
    222A  VAL      3.8     0.2    -      -       -      -
    224A  PHE*     1.3    82.8    -      -       -      +
    226A  PHE*     1.3    55.8    +      -       -      +
    228A  LEU*     3.5     2.8    +      -       -      +
    229A  LEU*     2.9    36.1    +      -       -      +
----------------------------------------------------------
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Residues in contact with PHE 226 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     30A  TYR*     3.8    32.5    -      +       -      -
     31A  PHE*     3.6     9.6    -      -       +      -
     34A  ARG*     5.6     1.1    -      -       -      -
    222A  VAL*     2.8    23.6    +      -       +      +
    223A  GLY*     3.1     7.4    +      -       -      +
    225A  GLY*     1.3    70.7    -      -       -      +
    227A  VAL*     1.3    73.0    +      -       +      +
    229A  LEU*     4.0     2.1    -      -       -      +
    230A  ARG*     3.1    75.7    +      -       +      +
----------------------------------------------------------
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Residues in contact with VAL 227 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    175A  THR*     4.7     4.4    -      -       +      +
    178A  THR*     4.3    20.2    -      -       +      -
    179A  LEU*     3.3    24.2    -      -       +      -
    182A  LEU*     4.6     9.6    -      -       +      -
    223A  GLY      3.1    14.9    +      -       -      +
    224A  PHE      3.5     7.2    -      -       -      +
    226A  PHE*     1.3    85.1    -      -       +      +
    228A  LEU*     1.3    63.4    +      -       -      +
    230A  ARG*     3.7    12.2    -      -       -      +
    231A  SER*     3.6    14.6    -      -       -      -
----------------------------------------------------------
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Residues in contact with LEU 228 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     46A  TYR*     4.3     8.3    -      -       +      -
     50A  THR*     3.7    15.5    -      -       +      +
    101A  ASP*     3.5    37.7    -      -       +      +
    105A  LEU*     3.9    19.5    -      -       +      -
    175A  THR*     4.7     3.8    -      -       +      -
    179A  LEU*     3.8    27.6    -      -       +      +
    224A  PHE*     3.1    18.9    +      -       +      +
    225A  GLY*     3.8     2.5    -      -       -      +
    227A  VAL*     1.3    79.9    -      -       -      +
    229A  LEU*     1.3    65.3    +      -       +      +
    231A  SER*     3.0    32.2    +      -       -      +
    234A  ILE*     3.7    28.7    -      -       +      +
----------------------------------------------------------
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Residues in contact with LEU 229 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     31A  PHE*     3.8    27.8    -      -       +      -
     34A  ARG*     3.6     9.9    +      -       -      -
     46A  TYR*     4.2     1.8    -      -       +      +
     47A  TYR*     3.2    67.1    +      -       +      +
     50A  THR*     3.6    38.4    -      -       +      +
    225A  GLY      2.9    23.2    +      -       -      +
    226A  PHE*     4.3     2.9    -      -       -      +
    228A  LEU*     1.3    84.1    -      -       +      +
    230A  ARG*     1.3    57.7    +      -       -      +
    231A  SER      3.3     1.8    +      -       -      +
    234A  ILE*     3.7    18.0    -      -       +      +
----------------------------------------------------------
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Residues in contact with ARG 230 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     30A  TYR*     4.5     1.4    +      -       -      -
     34A  ARG*     3.6    22.7    -      -       -      +
    226A  PHE*     3.1    70.5    +      -       +      +
    227A  VAL*     3.7     9.4    -      -       -      +
    229A  LEU*     1.3    75.7    -      -       -      +
    231A  SER*     1.3    61.5    +      -       -      +
    232A  ARG*     4.1     0.9    +      -       -      +
    239B  GLU*     2.9    44.1    +      -       -      +
----------------------------------------------------------
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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