Contacts of the helix formed by residues 285 - 311 (chain A) in PDB entry 2PWZ


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 SER 285 (chain A).
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    187A  SER*     3.9    16.9    +      -       -      -
    199A  VAL*     5.9     0.7    -      -       -      +
    284A  LEU*     1.3    78.1    -      -       -      +
    286A  ALA*     1.3    59.4    +      -       -      +
    287A  PHE*     3.5     8.3    +      -       -      +
    288A  GLU*     2.9    39.2    +      -       -      +
    289A  GLN*     3.0    26.6    +      -       -      +
----------------------------------------------------------
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Residues in contact with ALA 286 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    285A  SER*     1.3    72.5    -      -       -      +
    287A  PHE*     1.3    64.2    -      -       -      +
    289A  GLN*     3.3     6.8    +      -       -      +
    290A  ASN*     3.1    24.1    +      -       -      +
----------------------------------------------------------
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Residues in contact with PHE 287 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    183A  LEU*     5.1     3.1    -      -       +      -
    196A  GLU*     5.5    13.2    -      -       +      -
    199A  VAL*     3.3    37.0    -      -       +      -
    200A  ALA*     4.5    20.6    -      -       +      -
    203A  THR*     3.9    23.6    -      -       +      -
    285A  SER*     3.5     7.3    +      -       -      +
    286A  ALA*     1.3    79.2    -      -       -      +
    288A  GLU*     1.3    65.4    +      -       +      +
    290A  ASN*     3.6     8.8    +      -       -      +
    291A  ALA*     2.9    38.5    +      -       +      +
----------------------------------------------------------
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Residues in contact with GLU 288 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    183A  LEU*     3.4    20.5    -      -       +      +
    184A  PRO      3.9     2.4    -      -       -      +
    185A  LEU*     3.4    23.4    -      -       +      +
    186A  LEU*     3.2    12.6    +      -       -      +
    187A  SER*     2.7    46.2    +      -       -      -
    199A  VAL*     6.0     2.4    -      -       +      +
    283A  THR      4.3     0.3    -      -       -      +
    284A  LEU*     3.4    20.6    -      -       +      +
    285A  SER*     2.9    31.2    +      -       -      +
    286A  ALA      3.2     0.2    -      -       -      -
    287A  PHE*     1.3    80.7    -      -       +      +
    289A  GLN*     1.3    60.8    +      -       -      +
    291A  ALA      3.1     0.7    +      -       -      -
    292A  LEU*     2.9    32.6    +      -       -      +
----------------------------------------------------------
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Residues in contact with GLN 289 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    260A  TYR*     5.5     5.8    +      -       -      -
    284A  LEU*     3.9    24.5    -      -       +      +
    285A  SER      3.0    18.0    +      -       -      +
    286A  ALA*     3.3     6.3    +      -       -      +
    288A  GLU*     1.3    74.6    -      -       -      +
    290A  ASN*     1.3    63.2    +      -       -      +
    292A  LEU*     3.4    11.8    +      -       -      +
    293A  GLU*     2.6    63.3    +      -       -      +
----------------------------------------------------------
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Residues in contact with ASN 290 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    286A  ALA      3.1    16.8    +      -       -      +
    287A  PHE*     3.7     9.4    +      -       -      +
    289A  GLN*     1.3    76.5    -      -       -      +
    291A  ALA*     1.3    57.9    -      -       -      +
    293A  GLU*     3.4    10.5    +      -       -      +
    294A  GLY*     3.0    26.3    +      -       -      -
----------------------------------------------------------
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Residues in contact with ALA 291 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    180A  VAL      4.6     4.0    -      -       -      +
    183A  LEU*     3.7    23.1    -      -       +      -
    207A  GLN*     6.2     2.2    -      -       -      +
    287A  PHE*     2.9    30.4    +      -       +      +
    288A  GLU      3.5     4.7    -      -       -      +
    290A  ASN*     1.3    78.9    -      -       -      +
    292A  LEU*     1.3    63.0    +      -       -      +
    294A  GLY*     3.4     2.7    +      -       -      -
    295A  MET*     3.1    26.1    +      -       -      +
----------------------------------------------------------
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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
----------------------------------------------------------
    174A  ILE*     4.6     3.1    -      -       +      -
    183A  LEU*     3.7     5.7    -      -       +      +
    260A  TYR*     3.6    35.4    -      -       +      +
    264A  PHE*     3.5    37.0    -      -       +      -
    281A  ILE*     4.0     6.1    -      -       +      -
    284A  LEU*     3.6    23.8    -      -       +      -
    288A  GLU      2.9    16.8    +      -       -      +
    289A  GLN*     3.5    14.6    -      -       -      +
    291A  ALA*     1.3    72.3    -      -       -      +
    293A  GLU*     1.3    69.0    +      -       +      +
    295A  MET*     3.2    24.4    +      -       +      +
    296A  LEU*     3.1    28.0    -      -       +      +
----------------------------------------------------------
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Residues in contact with GLU 293 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    260A  TYR*     6.4     1.3    -      -       +      -
    289A  GLN*     2.6    51.5    +      -       -      +
    290A  ASN*     3.9     9.5    -      -       -      +
    292A  LEU*     1.3    79.0    -      -       +      +
    294A  GLY*     1.3    60.6    +      -       -      +
    295A  MET      3.4     1.0    +      -       -      -
    296A  LEU*     3.5    25.4    +      -       +      +
    297A  ASP      4.9     1.0    +      -       -      -
----------------------------------------------------------
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Residues in contact with GLY 294 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    180A  VAL*     4.8     4.8    -      -       -      +
    290A  ASN      3.0    16.2    +      -       -      -
    291A  ALA*     3.7     2.9    -      -       -      -
    292A  LEU      3.2     0.2    -      -       -      -
    293A  GLU*     1.3    77.2    -      -       -      +
    295A  MET*     1.3    57.5    +      -       -      +
    296A  LEU      3.4     0.2    -      -       -      -
    297A  ASP*     4.9     4.4    +      -       -      +
    298A  THR*     4.8     5.0    +      -       -      -
----------------------------------------------------------
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Residues in contact with MET 295 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    175A  GLY*     3.8    11.4    -      -       -      -
    180A  VAL*     3.4    32.3    -      -       +      +
    181A  THR*     3.5    33.8    -      -       +      +
    183A  LEU*     4.0    17.5    -      -       +      -
    264A  PHE*     4.2     0.7    -      -       +      -
    291A  ALA      3.1     8.9    +      -       -      +
    292A  LEU*     3.2    39.0    +      -       +      +
    294A  GLY*     1.3    78.1    -      -       -      +
    296A  LEU*     1.3    70.0    +      -       +      +
    297A  ASP      3.4     1.8    -      -       -      -
    298A  THR*     3.1    10.0    +      -       -      -
    299A  LEU*     3.0    51.1    +      -       +      -
----------------------------------------------------------
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Residues in contact with LEU 296 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    259A  GLN      5.3     0.9    -      -       -      +
    260A  TYR*     3.7    49.1    -      -       +      +
    261A  ALA*     5.5     0.2    -      -       +      -
    264A  PHE*     4.5     2.0    -      -       +      -
    292A  LEU*     3.1    36.8    -      -       +      +
    293A  GLU*     3.5    19.0    +      -       +      +
    294A  GLY      3.4     1.2    -      -       -      -
    295A  MET*     1.3    92.6    -      -       +      +
    297A  ASP*     1.3    64.0    +      -       -      +
    299A  LEU*     3.4     7.4    +      -       +      +
    300A  LYS*     3.0    40.7    +      -       -      +
----------------------------------------------------------
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Residues in contact with ASP 297 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    293A  GLU      4.9     1.0    +      -       -      -
    294A  GLY      4.9     4.0    +      -       -      +
    295A  MET      3.4     0.6    -      -       -      -
    296A  LEU*     1.3    77.6    -      -       -      +
    298A  THR*     1.3    59.3    +      -       -      +
    300A  LYS*     3.4    12.5    +      -       -      +
    301A  LYS*     2.9    54.3    +      -       -      +
----------------------------------------------------------
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Residues in contact with THR 298 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    178A  SER      5.7     0.7    -      -       -      +
    180A  VAL*     4.2    17.3    -      -       +      +
    181A  THR*     3.8    17.9    -      -       +      -
    294A  GLY      4.8     3.1    +      -       -      -
    295A  MET      3.1    11.0    +      -       -      -
    297A  ASP*     1.3    75.2    -      -       -      +
    299A  LEU*     1.3    61.0    +      -       -      +
    301A  LYS*     3.2    10.6    +      -       -      +
    302A  ASP*     2.9    44.9    +      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 299 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    122A  ASN*     3.8    31.0    -      -       -      +
    175A  GLY      4.1     4.7    -      -       -      -
    176A  GLY*     4.0     6.7    -      -       -      -
    181A  THR*     4.0     8.0    -      -       +      +
    253A  TYR*     3.8    20.2    -      -       +      +
    261A  ALA*     4.2    16.2    -      -       +      -
    263A  PHE      4.3     4.5    -      -       -      +
    264A  PHE*     3.7    26.2    -      -       +      -
    295A  MET*     3.0    39.4    +      -       +      +
    296A  LEU*     3.7    12.1    -      -       +      +
    297A  ASP      3.4     0.2    -      -       -      -
    298A  THR*     1.3    75.8    -      -       -      +
    300A  LYS*     1.3    57.0    +      -       -      +
    302A  ASP*     3.2     6.2    +      -       -      +
    303A  ILE*     3.0    33.7    +      -       +      +
----------------------------------------------------------
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Residues in contact with LYS 300 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    260A  TYR      3.4    23.3    +      -       -      -
    261A  ALA*     4.3    15.3    -      -       +      +
    262A  ARG      5.8     0.4    -      -       -      +
    296A  LEU*     3.0    32.3    +      -       -      +
    297A  ASP*     3.6    12.0    +      -       -      +
    299A  LEU*     1.3    73.1    -      -       -      +
    301A  LYS*     1.3    59.4    -      -       -      +
    303A  ILE*     3.4     8.9    +      -       +      +
    304A  ALA*     3.0    29.0    +      -       -      +
----------------------------------------------------------
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Residues in contact with LYS 301 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    297A  ASP*     2.9    42.1    +      -       -      +
    298A  THR*     3.4    10.8    -      -       -      +
    300A  LYS*     1.3    71.2    -      -       -      +
    302A  ASP*     1.3    67.8    +      -       -      +
    304A  ALA*     3.4     5.4    +      -       -      +
    305A  LEU*     3.0    25.7    +      -       -      +
----------------------------------------------------------
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Residues in contact with ASP 302 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    120A  PRO*     6.5     0.9    -      -       -      -
    122A  ASN*     3.2    42.1    +      -       +      +
    123A  THR*     2.4    33.0    +      -       -      +
    178A  SER*     4.7     5.2    +      -       -      -
    181A  THR*     4.4     0.3    -      -       -      +
    298A  THR*     2.9    33.6    +      -       -      +
    299A  LEU      3.2     9.2    +      -       -      +
    301A  LYS*     1.3    78.2    -      -       -      +
    303A  ILE*     1.3    61.8    +      -       -      +
    305A  LEU*     3.5    10.4    -      -       -      +
----------------------------------------------------------
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Residues in contact with ILE 303 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    122A  ASN      4.0     5.6    -      -       -      +
    126A  ALA*     3.6     8.8    -      -       +      +
    253A  TYR*     3.2    25.4    -      -       -      +
    261A  ALA*     3.6    29.8    -      -       +      -
    262A  ARG*     4.2     8.7    -      -       +      +
    263A  PHE*     3.7    35.4    -      -       +      +
    299A  LEU*     3.0    24.3    +      -       +      +
    300A  LYS*     3.7     7.6    -      -       +      +
    301A  LYS      3.2     0.4    -      -       -      -
    302A  ASP*     1.3    75.2    -      -       -      +
    304A  ALA*     1.3    63.0    +      -       -      +
    306A  GLY      3.0    10.4    +      -       -      -
    307A  GLU*     3.4    30.9    +      -       -      +
----------------------------------------------------------
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Residues in contact with ALA 304 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    300A  LYS      3.0    17.4    +      -       -      +
    301A  LYS*     3.9     6.5    -      -       -      +
    303A  ILE*     1.3    72.3    -      -       -      +
    305A  LEU*     1.3    60.3    +      -       -      +
    307A  GLU*     3.4    18.0    +      -       -      +
    308A  GLU*     3.0    43.0    +      -       +      +
----------------------------------------------------------
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Residues in contact with LEU 305 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     91A  PHE*     3.9    35.8    -      -       +      -
    120A  PRO*     6.2     0.4    -      -       +      -
    123A  THR*     3.9     9.7    -      -       -      +
    301A  LYS      3.0    18.1    +      -       -      +
    302A  ASP*     3.5    10.5    -      -       -      +
    304A  ALA*     1.3    77.5    -      -       -      +
    306A  GLY*     1.3    56.7    +      -       -      +
    308A  GLU*     3.7    25.1    +      -       +      +
    309A  PHE*     3.2    25.8    +      -       -      +
----------------------------------------------------------
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Residues in contact with GLY 306 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    123A  THR*     3.5    25.6    -      -       -      +
    126A  ALA*     4.2     0.4    -      -       -      -
    127A  ILE*     3.5    26.9    -      -       -      +
    302A  ASP      3.7     0.2    +      -       -      -
    303A  ILE      3.0     8.8    +      -       -      -
    305A  LEU*     1.3    76.9    -      -       -      +
    307A  GLU*     1.3    63.3    -      -       -      +
    309A  PHE*     3.2    12.6    +      -       -      +
    310A  VAL*     3.4    12.8    +      -       -      +
----------------------------------------------------------
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Residues in contact with GLU 307 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    126A  ALA*     4.6     3.4    -      -       +      -
    130A  GLU*     3.8    28.5    -      -       +      +
    262A  ARG*     2.8    37.5    +      -       -      +
    303A  ILE*     3.4    24.8    -      -       -      +
    304A  ALA*     3.7    17.2    -      -       -      +
    306A  GLY*     1.3    73.1    -      -       -      +
    308A  GLU*     1.3    63.5    +      -       -      +
    309A  PHE      3.3     0.3    +      -       -      -
    310A  VAL*     3.3     1.4    +      -       -      -
    311A  ASN*     3.0    35.6    +      -       -      +
----------------------------------------------------------
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Residues in contact with GLU 308 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    304A  ALA*     3.0    36.6    +      -       +      +
    305A  LEU*     3.7    25.5    +      -       +      +
    307A  GLU*     1.3    75.7    -      -       -      +
    309A  PHE*     1.3    62.7    +      -       -      +
    311A  ASN*     5.3     0.9    -      -       -      -
    312A  LYS*     3.0    40.1    +      -       -      +
----------------------------------------------------------
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Residues in contact with PHE 309 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     91A  PHE*     4.2    13.5    -      +       +      -
     92A  ASN*     3.9    24.0    -      -       +      -
     95A  ALA*     3.4    37.0    -      -       +      -
     96A  GLY*     3.5    22.4    -      -       -      -
     99A  LYS*     3.9    26.8    +      -       +      -
    127A  ILE*     4.1    15.5    -      -       +      -
    305A  LEU      3.2    11.7    +      -       -      +
    306A  GLY      3.5     9.4    -      -       -      +
    307A  GLU      3.2     0.8    -      -       -      -
    308A  GLU*     1.3    81.2    -      -       -      +
    310A  VAL*     1.3    63.4    +      -       -      +
    312A  LYS*     3.5    28.6    +      -       -      +
----------------------------------------------------------
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Residues in contact with VAL 310 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     99A  LYS*     4.4    22.7    +      -       +      +
    127A  ILE*     3.6    38.4    -      -       +      +
    130A  GLU*     3.7    22.4    -      -       +      -
    131A  VAL*     4.2    12.3    -      -       +      +
    134A  LYS*     3.6    31.3    -      -       +      -
    306A  GLY      3.6    12.3    -      -       -      +
    307A  GLU      3.3     3.7    +      -       -      +
    309A  PHE*     1.3    81.6    -      -       +      +
    311A  ASN*     1.3    59.8    +      -       -      +
    312A  LYS*     3.2    10.8    +      -       -      +
----------------------------------------------------------
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Residues in contact with ASN 311 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    130A  GLU*     3.3    24.6    +      -       -      +
    134A  LYS*     2.9    39.8    -      -       -      +
    307A  GLU*     3.0    25.0    +      -       -      +
    308A  GLU*     4.0     1.1    -      -       -      -
    310A  VAL*     1.3    81.1    -      -       -      +
    312A  LYS*     1.3    71.3    +      -       -      +
----------------------------------------------------------
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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