Contacts of the helix formed by residues 225 - 247 (chain N) in PDB entry 3FKS


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 PRO 225 (chain N).
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    302J  TYR*     3.2    33.8    -      -       +      +
     19N  ALA*     4.6    11.2    -      -       +      -
     63N  ALA      4.3     8.3    -      -       -      +
     64N  MET*     3.5     8.7    -      -       -      +
     65N  ASP*     3.5    47.8    -      -       -      +
    223N  ASN      4.3     0.4    -      -       -      +
    224N  GLU*     1.3    92.0    -      -       +      +
    226N  PRO*     1.3    78.6    -      -       +      +
    227N  GLY      3.0     2.4    +      -       -      +
    228N  ALA*     3.2    13.9    +      -       -      +
    229N  ARG*     3.9     2.6    -      -       -      -
----------------------------------------------------------
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Residues in contact with PRO 226 (chain N). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    298J  GLY      4.1     3.1    -      -       -      +
    299J  ASP*     4.4     5.8    -      -       +      -
    302J  TYR*     4.0    15.3    -      -       +      -
     19N  ALA*     4.7     4.7    -      -       +      -
    224N  GLU      3.7     0.2    -      -       -      -
    225N  PRO*     1.3    87.2    -      -       +      +
    227N  GLY*     1.3    63.0    +      -       -      +
    228N  ALA      3.4     0.3    +      -       -      -
    229N  ARG*     3.6    16.6    +      -       -      +
    230N  ALA*     3.4    17.3    +      -       -      +
    264N  ALA*     4.2     3.5    -      -       +      +
    267N  GLU*     3.7    33.7    -      -       +      +
    268N  VAL*     3.5    25.6    -      -       +      +
    271N  LEU*     3.8    24.9    -      -       +      -
----------------------------------------------------------
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Residues in contact with GLY 227 (chain N). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     19N  ALA*     6.1     1.0    -      -       -      +
     62N  ILE*     4.1    15.2    -      -       -      +
     63N  ALA      3.6    17.2    +      -       -      -
     64N  MET*     3.7     6.7    -      -       -      -
    225N  PRO*     3.0     2.8    +      -       -      +
    226N  PRO*     1.3    81.5    -      -       -      +
    228N  ALA*     1.3    61.7    +      -       -      +
    230N  ALA*     3.6     2.3    +      -       -      +
    231N  ARG*     3.2    27.9    +      -       -      +
    268N  VAL*     3.8    12.5    -      -       -      +
----------------------------------------------------------
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Residues in contact with ALA 228 (chain N). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     63N  ALA      4.3     1.6    +      -       -      -
     64N  MET*     3.7    29.6    -      -       -      +
     98N  VAL*     4.0    18.4    -      -       +      -
    224N  GLU*     3.4    26.5    -      -       +      +
    225N  PRO      3.2    10.6    +      -       -      +
    227N  GLY*     1.3    75.4    -      -       -      +
    229N  ARG*     1.3    59.0    +      -       -      +
    231N  ARG*     2.8    21.3    +      -       -      +
    232N  VAL*     2.9    18.0    +      -       -      +
----------------------------------------------------------
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Residues in contact with ARG 229 (chain N). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    301J  PHE*     3.2    30.1    -      -       -      -
    302J  TYR*     3.9     9.7    -      -       -      +
    187N  VAL*     3.4    13.5    -      -       -      +
    188N  GLY*     4.4    11.8    -      -       -      +
    220N  GLY      3.9     9.0    -      -       -      +
    221N  GLN      3.6    16.8    -      -       -      +
    222N  MET*     3.7    13.5    +      -       -      +
    224N  GLU*     3.1    31.3    +      -       -      +
    225N  PRO      3.9     4.0    -      -       -      +
    226N  PRO*     3.6    18.7    +      -       -      +
    227N  GLY      3.6     0.4    -      -       -      -
    228N  ALA*     1.3    78.9    -      -       -      +
    230N  ALA*     1.3    58.7    +      -       -      +
    232N  VAL*     3.1    25.5    -      -       -      +
    233N  ALA      4.4     0.9    +      -       -      -
    260N  ARG*     4.7     6.8    +      -       -      +
    261N  PHE*     4.4     3.3    -      -       -      -
    263N  GLN*     5.4     2.0    -      -       -      +
    264N  ALA*     4.0    20.5    -      -       +      +
    267N  GLU*     2.7    39.7    +      -       -      -
----------------------------------------------------------
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Residues in contact with ALA 230 (chain N). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    226N  PRO      3.4    15.2    +      -       -      +
    227N  GLY      3.9     4.7    -      -       -      +
    228N  ALA      3.1     1.2    -      -       -      -
    229N  ARG*     1.3    79.6    -      -       -      +
    231N  ARG*     1.3    75.0    +      -       +      +
    233N  ALA      4.6     0.6    +      -       -      -
    234N  LEU*     4.3     4.0    -      -       -      +
    261N  PHE*     3.2    32.0    -      -       +      +
    264N  ALA*     4.0    22.6    -      -       +      +
    265N  GLY*     4.3     7.0    -      -       -      +
    268N  VAL*     4.3     9.2    -      -       +      -
----------------------------------------------------------
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Residues in contact with ARG 231 (chain N). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     34N  LEU*     4.9     6.4    -      -       -      +
     49N  GLU*     3.3    29.2    +      -       -      +
     51N  ALA*     6.3     0.8    -      -       -      +
     62N  ILE*     5.1     7.2    -      -       +      +
     64N  MET*     4.0     9.6    -      -       +      -
     83N  ILE*     5.4     3.1    -      -       +      -
     98N  VAL*     4.2    11.4    -      -       +      -
    117N  ILE*     5.2     5.8    -      -       +      +
    118N  HIS*     3.2    27.6    -      -       -      -
    227N  GLY*     3.2    16.9    +      -       -      +
    228N  ALA      2.8     5.8    +      -       -      +
    230N  ALA*     1.3    88.4    +      -       -      +
    232N  VAL*     1.3    58.6    +      -       -      +
    233N  ALA      3.1     2.7    -      -       -      -
    234N  LEU*     2.9    38.1    +      -       +      +
    235N  THR*     3.0    14.8    +      -       -      +
    268N  VAL*     5.4    11.3    -      -       -      +
----------------------------------------------------------
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Residues in contact with VAL 232 (chain N). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     98N  VAL*     3.5    26.5    -      -       +      +
    185N  THR*     3.3    17.7    -      -       +      +
    186N  GLY      4.7     0.2    -      -       -      +
    187N  VAL*     3.9    17.9    -      -       +      -
    218N  VAL*     4.2     5.6    -      -       +      +
    220N  GLY*     3.5    35.2    -      -       -      +
    224N  GLU*     4.7     0.9    -      -       -      +
    228N  ALA*     2.9    21.6    +      -       +      +
    229N  ARG*     3.1    26.7    -      -       -      +
    231N  ARG*     1.3    78.4    -      -       -      +
    233N  ALA*     1.3    61.6    +      -       -      +
    235N  THR*     3.3    18.6    +      -       -      -
    236N  GLY      3.5     3.8    +      -       -      -
----------------------------------------------------------
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Residues in contact with ALA 233 (chain N). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    185N  THR*     4.2     4.2    -      -       -      +
    187N  VAL*     3.9    22.7    -      -       +      -
    229N  ARG      4.4     0.2    +      -       -      -
    231N  ARG      3.1     0.6    -      -       -      -
    232N  VAL*     1.3    82.6    -      -       -      +
    234N  LEU*     1.3    58.6    +      -       -      +
    236N  GLY*     4.2     1.0    +      -       -      -
    237N  LEU*     3.5    19.9    +      -       -      +
    253N  LEU*     5.0     0.2    -      -       -      +
    255N  ILE*     4.7    14.4    -      -       +      +
    261N  PHE*     3.7    35.4    -      -       +      -
    292N  LEU*     3.7    18.7    -      -       +      +
----------------------------------------------------------
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Residues in contact with LEU 234 (chain N). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    117N  ILE*     4.1    15.9    -      -       +      +
    118N  HIS*     3.7    31.4    -      -       +      +
    230N  ALA      4.3     5.8    -      -       -      +
    231N  ARG*     2.9    33.9    +      -       +      +
    233N  ALA*     1.3    77.5    -      -       +      +
    235N  THR*     1.3    66.1    +      -       -      +
    236N  GLY      3.2     2.2    -      -       -      -
    237N  LEU*     3.1    11.7    +      -       -      +
    238N  THR*     3.1    21.0    +      -       -      -
    261N  PHE*     5.4     4.0    -      -       +      -
    291N  LEU*     4.1    12.1    -      -       +      +
    292N  LEU*     3.6    23.8    -      -       +      -
    295N  ARG*     3.5    23.7    +      -       -      +
----------------------------------------------------------
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Residues in contact with THR 235 (chain N). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     85N  VAL*     3.7    23.0    -      -       +      +
     96N  ILE*     4.8     4.9    -      -       +      -
     97N  ASN      3.7    13.9    -      -       -      +
     98N  VAL*     3.0    32.4    +      -       -      +
    117N  ILE*     4.1    14.3    -      -       -      +
    218N  VAL*     4.0    12.3    -      -       +      -
    231N  ARG*     3.0    13.8    +      -       -      +
    232N  VAL*     3.5    15.7    -      -       -      -
    234N  LEU*     1.3    79.5    -      -       -      +
    236N  GLY*     1.3    58.5    +      -       -      +
    238N  THR*     3.9     0.7    +      -       -      -
    239N  ILE*     3.2    25.8    +      -       +      +
----------------------------------------------------------
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Residues in contact with GLY 236 (chain N). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    183N  VAL*     3.7     7.9    -      -       -      +
    185N  THR*     3.8    17.7    -      -       -      -
    218N  VAL*     4.1    12.0    -      -       -      +
    232N  VAL      3.5     6.5    +      -       -      -
    234N  LEU      3.2     0.2    -      -       -      -
    235N  THR*     1.3    76.2    -      -       -      +
    237N  LEU*     1.3    65.3    +      -       -      +
    238N  THR      3.1     2.0    -      -       -      -
    239N  ILE*     3.0    26.0    +      -       -      +
    240N  ALA      3.2     5.4    +      -       -      -
    253N  LEU*     4.0     8.0    -      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 237 (chain N). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    233N  ALA      3.5    17.6    +      -       -      +
    234N  LEU*     3.1     6.8    +      -       -      +
    236N  GLY*     1.3    77.8    -      -       -      +
    238N  THR*     1.3    58.9    +      -       -      +
    240N  ALA*     3.4     2.4    +      -       -      +
    241N  GLU*     3.1    22.4    +      -       +      +
    253N  LEU*     3.4    28.6    -      -       +      +
    292N  LEU*     3.5    32.5    -      -       +      +
    295N  ARG*     3.2    53.2    -      -       +      +
    296N  ILE*     3.8    17.5    -      -       +      -
    304N  VAL*     4.9     6.5    -      -       +      -
----------------------------------------------------------
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Residues in contact with THR 238 (chain N). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     85N  VAL*     4.6     4.3    -      -       +      -
     87N  VAL*     4.2     5.2    -      -       +      +
    115N  LYS*     3.9    27.4    -      -       +      +
    116N  PRO      3.2    20.6    -      -       -      +
    117N  ILE*     3.1    16.4    +      -       -      -
    234N  LEU      3.1    13.3    +      -       -      -
    235N  THR      4.1     5.6    -      -       -      -
    236N  GLY      3.1     0.2    -      -       -      -
    237N  LEU*     1.3    74.1    -      -       -      +
    239N  ILE*     1.3    65.2    +      -       -      +
    241N  GLU*     3.2    22.5    +      -       -      +
    242N  TYR*     3.3    13.0    +      -       -      +
    295N  ARG*     2.9    19.5    +      -       -      +
----------------------------------------------------------
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Residues in contact with ILE 239 (chain N). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     85N  VAL*     3.8    17.0    -      -       +      -
     86N  PRO*     3.2    26.5    -      -       +      +
     87N  VAL*     4.0    10.0    -      -       +      +
     88N  GLY      5.3     0.4    -      -       -      +
     91N  THR*     4.2    16.6    -      -       +      +
     96N  ILE*     6.3     5.2    -      -       +      -
    183N  VAL*     3.9    17.3    -      -       +      -
    216N  ALA*     4.6     7.2    -      -       +      -
    218N  VAL*     4.9     7.2    -      -       +      -
    235N  THR*     3.2    22.9    -      -       +      +
    236N  GLY*     3.0    13.2    +      -       -      +
    238N  THR*     1.3    78.0    -      -       -      +
    240N  ALA*     1.3    59.0    +      -       -      +
    241N  GLU      3.5     0.2    +      -       -      -
    242N  TYR*     3.6     8.3    +      -       -      +
    243N  PHE*     3.0    39.8    -      -       +      -
----------------------------------------------------------
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Residues in contact with ALA 240 (chain N). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    183N  VAL*     4.1     8.7    -      -       +      +
    236N  GLY      3.2     6.7    +      -       -      +
    237N  LEU*     3.9     7.4    -      -       -      +
    238N  THR      3.3     0.2    -      -       -      -
    239N  ILE*     1.3    77.7    -      -       -      +
    241N  GLU*     1.3    65.3    +      -       -      +
    242N  TYR      3.4     0.2    +      -       -      -
    243N  PHE*     3.5     2.8    +      -       -      -
    244N  ARG      3.2    15.4    +      -       -      -
    251N  VAL*     3.4    35.3    -      -       +      +
    253N  LEU*     4.5    11.9    -      -       +      -
    304N  VAL*     3.5    24.3    -      -       +      +
----------------------------------------------------------
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Residues in contact with GLU 241 (chain N). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    115N  LYS*     5.8     5.5    -      -       +      +
    119N  ALA*     4.4    13.0    -      -       -      +
    120N  ASP      5.3     2.1    -      -       -      +
    122N  PRO*     5.3     2.6    -      -       -      +
    237N  LEU*     3.1    17.9    +      -       +      +
    238N  THR*     3.2    19.7    +      -       +      +
    240N  ALA*     1.3    74.2    -      -       -      +
    242N  TYR*     1.3    60.4    +      -       -      +
    244N  ARG*     3.0    36.0    +      -       -      +
    245N  ASP*     2.8    38.6    +      -       -      +
    295N  ARG*     3.3    50.8    +      -       -      +
    304N  VAL*     4.5     1.3    -      -       +      +
----------------------------------------------------------
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Residues in contact with TYR 242 (chain N). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     87N  VAL*     3.4    39.3    -      -       +      -
     88N  GLY*     4.0    25.4    -      -       -      +
    112N  LYS*     3.4    28.2    +      -       -      -
    113N  LEU*     4.1    14.8    -      -       +      +
    115N  LYS*     4.1    25.5    -      -       +      +
    238N  THR      3.3     4.6    +      -       -      +
    239N  ILE      3.8     9.9    -      -       -      +
    240N  ALA      3.3     0.6    -      -       -      -
    241N  GLU*     1.3    78.2    -      -       -      +
    243N  PHE*     1.3    61.7    +      +       +      +
    245N  ASP*     5.1     0.7    -      -       -      -
    246N  GLU*     2.6    80.9    +      -       +      +
    247N  GLU*     4.2    12.8    -      -       -      -
----------------------------------------------------------
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Residues in contact with PHE 243 (chain N). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     88N  GLY*     2.9    41.5    -      -       -      -
     89N  ARG*     4.2    11.7    -      -       +      -
     91N  THR*     4.6     2.2    -      -       -      -
     92N  LEU*     4.6    12.6    -      -       +      -
    181N  PHE*     4.3    12.6    -      +       +      -
    183N  VAL*     4.5     7.2    -      -       +      -
    239N  ILE*     3.0    44.2    -      -       +      -
    240N  ALA*     3.9     6.3    -      -       -      +
    241N  GLU      3.4     0.6    -      -       -      -
    242N  TYR*     1.3    77.5    -      +       -      +
    244N  ARG*     1.3    56.8    +      -       -      +
    247N  GLU*     3.0    42.3    +      -       -      +
    249N  GLN*     3.0    46.5    +      -       -      +
    251N  VAL*     3.6    17.5    -      -       +      -
----------------------------------------------------------
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Residues in contact with ARG 244 (chain N). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    122N  PRO*     4.2    13.3    -      -       -      +
    240N  ALA      3.2     2.0    +      -       -      +
    241N  GLU*     3.0    38.4    +      -       -      +
    243N  PHE*     1.3    80.1    -      -       -      +
    245N  ASP*     1.3    75.5    +      -       -      +
    248N  GLY*     3.3    10.7    -      -       -      -
    249N  GLN      3.8     8.3    -      -       -      -
    251N  VAL*     3.8     0.8    -      -       +      +
    295N  ARG      3.2    22.6    +      -       -      -
    297N  THR*     2.9    26.9    +      -       -      +
    299N  THR*     3.6    22.8    -      -       -      +
    301N  LYS*     3.3     4.2    -      -       -      +
    302N  GLY      3.2    23.8    +      -       -      -
    303N  SER*     3.2    33.0    -      -       -      +
    304N  VAL*     3.4    31.9    -      -       +      +
----------------------------------------------------------
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Residues in contact with ASP 245 (chain N). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    115N  LYS*     5.4    10.5    +      -       -      +
    122N  PRO*     6.0     0.2    -      -       -      +
    241N  GLU*     2.8    26.3    +      -       -      +
    242N  TYR*     4.3     1.3    -      -       -      +
    244N  ARG*     1.3   103.2    +      -       -      +
    246N  GLU*     1.3    64.1    +      -       -      +
    299N  THR*     3.5    20.3    +      -       -      +
    301N  LYS*     3.5    34.8    +      -       +      +
----------------------------------------------------------
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Residues in contact with GLU 246 (chain N). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    112N  LYS*     4.5     5.7    +      -       -      -
    113N  LEU*     4.6     6.3    -      -       -      +
    115N  LYS*     5.7     3.3    +      -       -      +
    242N  TYR*     2.6    73.0    +      -       +      +
    245N  ASP*     1.3    79.0    -      -       +      +
    247N  GLU*     1.3    61.6    +      -       +      +
    248N  GLY      3.4     2.2    +      -       -      -
    301N  LYS*     5.8     1.8    +      -       -      +
----------------------------------------------------------
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Residues in contact with GLU 247 (chain N). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    119B  GLY*     5.0     2.1    -      -       -      +
    300E  LYS*     3.9    10.4    +      -       -      +
     89N  ARG*     3.5    40.5    +      -       -      +
    242N  TYR*     4.2    11.1    -      -       +      -
    243N  PHE*     3.0    30.1    +      -       -      +
    246N  GLU*     1.3    88.6    -      -       +      +
    248N  GLY*     1.3    65.8    +      -       -      +
    249N  GLN*     3.0    27.7    +      -       +      +
----------------------------------------------------------
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A short description of the analytical approach
The contact analysis used in this page is based upon the approach developed in: Sobolev V., Wade R.C., Vriend G. and Edelman M. PROTEINS (1996) 25, 120-129. Contact legitimacy depends on the hydrophobic-hydrophilic properties of the contacting atoms. In order to define it, for each inter-atomic contact, eight atom classes have been introduced:


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

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

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