Contacts of the helix formed by residues 275 - 299 (chain A) in PDB entry 4G1U


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

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

Legend:
Dist - nearest distance (Å) between atoms of two residues
Surf - contact surface area (Å2) between two residues
HB   - hydrophilic-hydrophilic contact (hydrogen bond)
Arom - aromatic-aromatic contact
Phob - hydrophobic-hydrophobic contact
DC   - hydrophobic-hydrophilic contact (destabilizing contact)
+/-  - indicates presence/absence of a specific contacts
*    - indicates residues forming contacts  by their side chain
       (including CA atoms)
Residues in contact with ASP 275 (chain A).
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    216A  ASN*     3.0    20.2    +      -       -      -
    273A  GLY*     2.9     8.3    -      -       -      +
    274A  ALA*     1.3    75.5    -      -       -      +
    276A  HIS*     1.3    59.1    +      -       -      +
    277A  ARG*     2.6    53.1    +      -       -      +
    278A  TRP*     3.4    17.0    +      -       +      +
    279A  LEU*     2.9    25.5    +      -       -      +
    100D  PHE*     3.6     7.4    -      -       +      -
    104D  GLU*     4.2    16.9    +      -       -      +
----------------------------------------------------------
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Residues in contact with HIS 276 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     74A  THR*     4.1    14.2    +      -       +      -
     78A  GLY*     4.3     6.0    -      -       -      -
    212A  ALA*     3.5    27.8    -      -       +      +
    215A  LEU*     3.1    52.4    -      -       +      +
    216A  ASN*     3.1    23.8    +      -       -      +
    219A  GLN*     4.1    16.4    -      -       +      -
    269A  ARG*     5.6     1.8    +      -       -      -
    274A  ALA      3.8     7.6    +      -       -      -
    275A  ASP*     1.3    73.0    +      -       -      +
    277A  ARG*     1.3    60.0    +      -       -      +
    278A  TRP      3.2     0.2    -      -       -      -
    279A  LEU*     3.5    28.4    -      -       +      +
    280A  LEU*     2.9    37.0    +      -       +      +
     98D  PHE*     5.4     5.0    -      +       -      -
    100D  PHE*     5.0     0.4    -      +       -      -
----------------------------------------------------------
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Residues in contact with ARG 277 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    209A  LEU*     4.2     7.7    -      -       -      +
    212A  ALA*     3.8    18.6    -      -       +      +
    213A  ARG*     4.6    24.6    -      -       +      +
    216A  ASN*     4.5     9.6    -      -       -      +
    275A  ASP*     2.6    41.9    +      -       -      +
    276A  HIS*     1.3    76.6    -      -       -      +
    278A  TRP*     1.3    83.7    +      -       +      +
    281A  PRO*     3.1    20.4    -      -       -      +
----------------------------------------------------------
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Residues in contact with TRP 278 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
      7A  PRO*     3.6    33.0    -      -       +      +
      8A  ARG*     4.4    33.9    -      -       +      -
     11A  LEU*     4.3    22.7    -      -       +      +
    272A  ILE*     3.4    39.2    -      -       +      +
    275A  ASP*     3.4    22.4    +      -       +      +
    277A  ARG*     1.3   100.9    -      -       +      +
    279A  LEU*     1.3    65.3    +      -       -      +
    280A  LEU      3.6     0.2    -      -       -      -
    281A  PRO*     3.6     3.6    -      -       +      +
    282A  GLY*     3.4    15.6    +      -       -      -
----------------------------------------------------------
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Residues in contact with LEU 279 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     74A  THR*     3.9    15.0    -      -       +      +
    265A  PRO*     3.9    12.8    -      -       +      +
    268A  ILE*     3.5    22.8    -      -       +      +
    269A  ARG*     3.6    48.0    -      -       +      +
    272A  ILE*     5.2     0.2    -      -       -      -
    273A  GLY      4.7     3.8    +      -       -      +
    274A  ALA      4.2     8.5    -      -       -      +
    275A  ASP      2.9    18.5    +      -       -      +
    276A  HIS*     3.3    31.6    +      -       +      +
    278A  TRP*     1.3    78.8    -      -       -      +
    280A  LEU*     1.3    68.2    +      -       -      +
    282A  GLY*     3.8     0.3    -      -       -      -
    283A  ALA*     3.0    21.3    +      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 280 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     71A  VAL*     4.2    19.8    -      -       +      +
     74A  THR*     4.2    20.0    -      -       +      -
     75A  ILE*     4.0    26.0    -      -       +      -
    205A  CYS      5.7     1.8    -      -       -      +
    208A  GLY      3.1    33.0    -      -       -      +
    209A  LEU*     3.6    15.5    -      -       +      -
    212A  ALA*     3.4    19.5    -      -       +      -
    215A  LEU*     5.2     4.5    -      -       +      -
    276A  HIS*     2.9    28.6    +      -       +      +
    279A  LEU*     1.3    75.5    -      -       -      +
    281A  PRO*     1.4    68.5    -      -       +      +
    283A  ALA*     3.1     2.9    +      -       -      +
    284A  ALA*     2.9    21.9    +      -       -      +
----------------------------------------------------------
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Residues in contact with PRO 281 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     11A  LEU*     4.3    21.5    -      -       +      -
    209A  LEU*     3.6    17.9    -      -       +      -
    277A  ARG      3.1    27.8    -      -       -      +
    278A  TRP*     3.6     8.1    -      -       +      +
    280A  LEU*     1.4    94.3    -      -       +      +
    282A  GLY*     1.3    65.2    +      -       -      +
    284A  ALA*     3.2    10.8    +      -       +      +
    285A  LEU*     3.1    30.2    +      -       +      +
----------------------------------------------------------
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Residues in contact with GLY 282 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     11A  LEU*     3.5    21.9    -      -       -      +
     14A  LEU*     3.5     7.2    -      -       -      +
    268A  ILE*     3.4    23.2    -      -       -      +
    272A  ILE*     5.0     1.3    -      -       -      -
    278A  TRP      3.4     9.1    +      -       -      -
    279A  LEU      3.8     0.7    -      -       -      -
    280A  LEU      3.3     0.8    -      -       -      -
    281A  PRO*     1.3    85.4    -      -       -      +
    283A  ALA*     1.3    60.1    +      -       -      +
    285A  LEU*     3.4     1.0    +      -       -      -
    286A  GLY      3.0    17.5    +      -       -      -
----------------------------------------------------------
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Residues in contact with ALA 283 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     70A  ALA*     3.3    20.8    -      -       +      +
     71A  VAL*     4.8     0.4    -      -       -      +
     74A  THR*     3.8    22.2    -      -       -      +
    264A  VAL*     4.0     9.3    -      -       +      +
    265A  PRO*     4.6     6.5    -      -       +      -
    268A  ILE*     3.8    13.5    -      -       +      +
    279A  LEU*     3.0    14.4    +      -       +      +
    280A  LEU      3.4     8.3    -      -       -      +
    282A  GLY*     1.3    74.2    -      -       -      +
    284A  ALA*     1.3    55.9    +      -       -      +
    286A  GLY      2.9     1.2    +      -       -      -
    287A  GLY      2.6    33.1    +      -       -      -
----------------------------------------------------------
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Residues in contact with ALA 284 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     67A  CYS*     3.5    33.8    -      -       -      +
     70A  ALA*     4.1     4.4    -      -       -      +
     71A  VAL*     3.5    28.7    -      -       +      +
    205A  CYS*     5.4     0.9    -      -       +      -
    280A  LEU      2.9     9.3    +      -       -      +
    281A  PRO*     3.2    14.1    +      -       +      +
    283A  ALA*     1.3    74.6    -      -       -      +
    285A  LEU*     1.3    66.9    +      -       +      +
    288A  ALA*     3.5    13.0    +      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 285 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     11A  LEU*     3.7    32.8    -      -       +      +
     14A  LEU*     4.0    16.1    -      -       +      +
     15A  LEU*     3.8    34.5    -      -       +      +
     18A  LEU*     4.6    10.1    -      -       +      +
    281A  PRO*     3.1    20.3    +      -       +      +
    282A  GLY      3.9     3.8    -      -       -      +
    283A  ALA      3.1     0.6    -      -       -      -
    284A  ALA*     1.3    82.5    -      -       +      +
    286A  GLY*     1.3    59.9    +      -       -      +
    287A  GLY      3.2     0.4    -      -       -      -
    288A  ALA*     3.6     5.5    +      -       -      +
    289A  CYS*     3.0    32.1    +      -       -      -
----------------------------------------------------------
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Residues in contact with GLY 286 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     14A  LEU*     4.3    11.0    -      -       -      +
    264A  VAL*     3.2    17.0    -      -       -      +
    268A  ILE*     4.0     6.7    -      -       -      -
    282A  GLY      3.0    11.5    +      -       -      -
    283A  ALA      2.9     5.6    +      -       -      -
    285A  LEU*     1.3    74.9    -      -       -      +
    287A  GLY*     1.3    61.3    +      -       -      +
    289A  CYS*     3.5     7.2    -      -       -      +
    290A  LEU*     2.9    29.8    +      -       -      +
----------------------------------------------------------
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Residues in contact with GLY 287 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     66A  GLY*     3.5    21.1    -      -       -      -
     70A  ALA*     3.7     6.3    -      -       -      -
    260A  ILE*     4.1     8.8    -      -       -      +
    264A  VAL*     3.5     6.7    -      -       -      +
    283A  ALA      2.6    20.4    +      -       -      -
    286A  GLY*     1.3    71.7    -      -       -      +
    288A  ALA*     1.3    59.1    +      -       -      +
    290A  LEU*     4.0     1.1    -      -       -      +
    291A  LEU*     2.9    34.3    +      -       -      +
----------------------------------------------------------
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Residues in contact with ALA 288 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     18A  LEU*     3.7    25.7    -      -       +      +
     62A  ALA      4.3     0.2    -      -       -      -
     63A  VAL*     3.3    41.9    -      -       +      +
     66A  GLY*     3.7     3.6    -      -       -      -
     67A  CYS*     4.1     1.1    -      -       +      +
    284A  ALA      3.5    17.3    +      -       -      +
    285A  LEU*     3.8     3.6    -      -       -      +
    286A  GLY      3.4     0.2    -      -       -      -
    287A  GLY*     1.3    75.0    -      -       -      +
    289A  CYS*     1.3    63.2    +      -       -      +
    292A  LEU*     3.1    27.0    +      -       -      +
----------------------------------------------------------
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Residues in contact with CYS 289 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     14A  LEU*     3.7    27.8    -      -       +      -
     17A  LEU*     3.8    24.0    -      -       +      -
     18A  LEU*     3.8    20.2    -      -       -      +
     21A  LEU*     3.8    13.3    -      -       +      +
    285A  LEU      3.0    23.7    +      -       -      +
    286A  GLY*     3.5     9.0    -      -       -      +
    288A  ALA*     1.3    79.3    -      -       -      +
    290A  LEU*     1.3    53.8    +      -       -      +
    292A  LEU*     3.7     2.0    -      -       -      +
    293A  THR*     2.8    37.5    +      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 290 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    260A  ILE*     3.7    24.7    -      -       +      -
    263A  VAL*     4.7    14.4    -      -       +      -
    264A  VAL*     4.7    23.1    -      -       +      +
    267A  LEU*     5.1     7.6    -      -       +      -
    286A  GLY      2.9    17.1    +      -       -      +
    287A  GLY*     3.3     3.6    +      -       -      +
    289A  CYS*     1.3    75.3    -      -       +      +
    291A  LEU*     1.3    65.7    +      -       -      +
    293A  THR*     3.5     9.6    +      -       +      -
    294A  ALA*     3.0    24.7    +      -       +      +
    316A  LEU*     6.6     0.2    -      -       +      -
----------------------------------------------------------
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Residues in contact with LEU 291 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     62A  ALA*     3.6    17.7    -      -       +      +
     65A  VAL*     3.5    22.7    -      -       +      -
     66A  GLY*     3.3    30.5    -      -       -      +
     69A  LEU*     5.1     0.9    -      -       +      -
    186A  LEU*     5.0     4.0    -      -       +      -
    257A  ILE*     4.1    16.8    -      -       +      -
    260A  ILE*     4.1    22.1    -      -       +      +
    287A  GLY      2.9    16.6    +      -       -      +
    290A  LEU*     1.3    76.2    -      -       -      +
    292A  LEU*     1.3    53.8    +      -       -      +
    294A  ALA*     2.9     7.1    +      -       +      +
    295A  ASP*     2.7    34.6    +      -       +      +
    309A  VAL*     3.6    28.3    -      -       +      -
    313A  THR*     4.6     1.1    -      -       +      -
----------------------------------------------------------
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Residues in contact with LEU 292 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     18A  LEU*     4.5     4.3    -      -       +      -
     21A  LEU*     3.9    12.1    -      -       +      -
     22A  ALA*     3.8    31.2    -      -       +      +
     25A  SER*     4.3     5.8    -      -       -      +
     59A  VAL*     3.7    26.7    -      -       +      +
     62A  ALA*     3.6    27.3    -      -       +      +
     63A  VAL*     3.9    20.9    -      -       +      -
    288A  ALA      3.1    17.7    +      -       -      +
    289A  CYS      3.7     2.5    -      -       -      +
    291A  LEU*     1.3    77.7    -      -       -      +
    293A  THR*     1.3    56.8    +      -       -      +
    295A  ASP*     4.4     1.6    -      -       +      +
    296A  THR*     2.8    49.0    +      -       -      +
----------------------------------------------------------
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Residues in contact with THR 293 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     21A  LEU*     3.5    25.1    -      -       +      +
    289A  CYS      2.8    23.5    +      -       -      -
    290A  LEU*     3.7    13.0    -      -       +      +
    291A  LEU      3.3     0.2    -      -       -      -
    292A  LEU*     1.3    76.9    -      -       -      +
    294A  ALA*     1.3    57.9    +      -       -      +
    296A  THR*     4.3     3.6    -      -       -      -
    297A  LEU*     3.1    33.6    +      -       +      +
----------------------------------------------------------
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Residues in contact with ALA 294 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    260A  ILE*     5.7     0.9    -      -       +      -
    290A  LEU*     3.0    15.5    +      -       +      +
    291A  LEU*     2.9    11.1    +      -       -      +
    293A  THR*     1.3    77.0    -      -       -      +
    295A  ASP*     1.3    60.0    +      -       -      +
    297A  LEU*     3.9     4.7    -      -       -      -
    298A  ALA*     3.1    24.3    +      -       -      +
    309A  VAL*     4.1    17.7    -      -       +      +
    312A  LEU*     3.6    16.3    -      -       +      +
    313A  THR*     4.3    14.1    -      -       +      +
    316A  LEU*     5.8     7.4    -      -       +      -
----------------------------------------------------------
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Residues in contact with ASP 295 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     58A  ARG*     2.7    41.0    +      -       -      -
     62A  ALA*     4.4    12.1    -      -       +      -
    186A  LEU*     3.1    40.3    -      -       -      +
    291A  LEU*     2.7    18.6    +      -       +      +
    292A  LEU*     4.1     2.9    -      -       +      +
    294A  ALA*     1.3    71.0    -      -       -      +
    296A  THR*     1.3    59.3    +      -       -      +
    297A  LEU      3.1     1.1    -      -       -      -
    298A  ALA*     2.8    26.5    +      -       -      +
    299A  ARG*     3.2     9.2    +      -       -      +
    309A  VAL*     3.3    19.7    -      -       +      +
----------------------------------------------------------
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Residues in contact with THR 296 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     25A  SER*     2.8    43.3    +      -       -      +
     28A  MET*     4.3    22.0    -      -       +      -
     59A  VAL*     5.0     0.9    -      -       -      +
    292A  LEU*     2.8    28.4    +      -       -      +
    293A  THR*     4.3     3.8    -      -       -      -
    295A  ASP*     1.3    76.0    -      -       -      +
    297A  LEU*     1.3    59.1    +      -       -      +
    298A  ALA      3.5     0.3    +      -       -      -
    299A  ARG*     3.7    20.7    +      -       -      +
    300A  THR*     2.8    30.4    +      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 297 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    293A  THR*     3.1    23.2    +      -       +      +
    294A  ALA*     4.1     5.4    -      -       -      +
    295A  ASP      3.1     0.6    -      -       -      -
    296A  THR*     1.3    78.2    -      -       -      +
    298A  ALA*     1.3    60.1    +      -       -      +
    300A  THR*     3.9     4.0    -      -       +      -
    301A  LEU*     2.9    64.1    +      -       +      +
    312A  LEU*     4.1    16.3    -      -       +      +
    316A  LEU*     5.2    11.7    -      -       +      -
----------------------------------------------------------
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Residues in contact with ALA 298 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     58A  ARG*     5.3     1.1    -      -       -      +
    294A  ALA      3.1    15.5    +      -       -      +
    295A  ASP*     2.8    19.1    +      -       -      +
    297A  LEU*     1.3    79.9    -      -       -      +
    299A  ARG*     1.3    57.9    +      -       -      +
    300A  THR      3.1     3.3    +      -       -      -
    301A  LEU*     3.9     6.9    +      -       -      +
    302A  VAL      4.8     0.3    +      -       -      -
    305A  ALA      3.5    11.4    -      -       -      +
    307A  MET*     3.5    37.7    -      -       +      +
    309A  VAL*     4.5    10.8    -      -       +      +
    312A  LEU*     3.8    13.7    -      -       +      -
----------------------------------------------------------
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Residues in contact with ARG 299 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     25A  SER*     3.0    29.5    +      -       -      -
     28A  MET*     2.9    34.4    +      -       -      +
     55A  ARG*     3.7    22.8    -      -       -      +
     58A  ARG*     3.3    46.8    -      -       -      +
     59A  VAL*     5.1     6.1    -      -       -      +
    295A  ASP      3.7     7.9    -      -       -      +
    296A  THR*     3.7    17.7    +      -       -      +
    298A  ALA*     1.3    77.3    -      -       -      +
    300A  THR*     1.3    67.2    +      -       -      +
    302A  VAL      4.2     5.2    -      -       -      +
    304A  PRO*     5.6     1.6    -      -       -      +
    305A  ALA      3.9    17.8    +      -       -      +
    306A  GLU*     4.5    16.8    -      -       +      +
----------------------------------------------------------
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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