Contacts of the helix formed by residues 266 - 292 (chain A) in PDB entry 2W5X


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 ASN 266 (chain A).
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    224A  GLU*     4.9     3.8    +      -       -      -
    261A  GLY      3.1     6.5    +      -       -      +
    264A  ALA*     4.0    20.7    -      -       +      +
    265A  ASN*     1.3    75.1    -      -       -      +
    267A  ALA*     1.3    58.5    +      -       -      +
    268A  SER      3.3     0.2    +      -       -      -
    269A  TYR*     3.1    34.4    +      -       +      +
    270A  LEU*     3.0    28.9    +      -       -      +
    332A  PHE*     3.8     2.4    -      -       -      -
   1380A   MG      2.6    29.5    -      -       -      -
----------------------------------------------------------
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Residues in contact with ALA 267 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    265A  ASN      3.9     3.6    +      -       -      -
    266A  ASN*     1.3    71.4    +      -       -      +
    268A  SER*     1.3    60.9    +      -       -      +
    270A  LEU*     3.4     2.4    +      -       -      +
    271A  ILE*     2.9    40.2    +      -       +      +
    307A  PHE*     4.6     1.8    -      -       +      -
    330A  PRO*     3.9    34.8    -      -       +      +
    332A  PHE*     4.0    15.9    -      -       +      -
----------------------------------------------------------
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Residues in contact with SER 268 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    224A  GLU*     2.7    25.4    +      -       -      +
    266A  ASN*     3.3     1.2    +      -       -      -
    267A  ALA*     1.3    79.3    -      -       -      +
    269A  TYR*     1.3    55.1    +      -       -      +
    271A  ILE*     4.2     6.2    -      -       -      +
    272A  SER*     2.8    33.8    +      -       -      -
   1380A   MG      2.5    26.8    -      -       -      -
----------------------------------------------------------
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Residues in contact with TYR 269 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    222A  THR*     3.6    21.6    -      -       +      +
    224A  GLU*     4.2    11.7    -      -       +      +
    257A  GLN*     2.8    28.7    +      -       -      +
    260A  TRP*     3.4    26.7    -      -       +      -
    261A  GLY*     3.7    20.9    -      -       -      -
    264A  ALA*     4.9     5.4    -      -       +      -
    266A  ASN*     3.1    36.7    +      -       +      +
    268A  SER*     1.3    78.3    +      -       -      +
    270A  LEU*     1.3    64.0    +      -       -      +
    272A  SER*     3.1     5.9    +      -       -      -
    273A  GLU*     3.0    60.1    +      -       +      +
----------------------------------------------------------
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Residues in contact with LEU 270 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     44A  GLY      5.8     0.2    -      -       -      +
     49A  GLN*     3.7    39.3    -      -       +      +
     52A  SER*     4.6     1.3    -      -       -      +
    258A  ILE*     4.0    20.2    -      -       +      +
    261A  GLY*     4.0     9.6    -      -       -      -
    262A  GLY*     3.8    26.2    -      -       -      +
    266A  ASN      3.0    17.0    +      -       -      +
    267A  ALA*     3.7     5.2    -      -       -      +
    269A  TYR*     1.3    77.7    -      -       -      +
    271A  ILE*     1.3    65.1    +      -       +      +
    273A  GLU*     3.3     6.2    +      -       -      +
    274A  ILE*     3.0    30.7    +      -       +      +
    307A  PHE*     3.8    29.6    -      -       +      -
    332A  PHE*     3.9     5.2    -      -       +      -
----------------------------------------------------------
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Residues in contact with ILE 271 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     52A  SER*     4.0    17.9    -      -       -      +
     56A  PHE*     3.6    54.3    -      -       +      +
    267A  ALA*     2.9    29.4    +      -       +      +
    268A  SER*     4.2     4.9    -      -       -      +
    270A  LEU*     1.3    73.2    -      -       +      +
    272A  SER*     1.3    57.9    +      -       -      +
    274A  ILE*     3.3     7.7    +      -       -      +
    275A  ASN*     2.9    42.9    +      -       -      +
    307A  PHE*     4.2    18.6    -      -       +      -
    330A  PRO*     4.4     9.4    -      -       +      -
----------------------------------------------------------
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Residues in contact with SER 272 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    223A  MET*     3.6    27.1    -      -       -      +
    224A  GLU*     3.8    21.4    -      -       -      +
    268A  SER      2.8    22.9    +      -       -      -
    269A  TYR*     3.1     9.7    +      -       -      -
    271A  ILE*     1.3    76.8    -      -       -      +
    273A  GLU*     1.3    62.6    +      -       -      +
    275A  ASN*     3.9     9.4    -      -       -      +
    276A  ASP*     3.3    16.5    +      -       -      +
----------------------------------------------------------
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Residues in contact with GLU 273 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    130A  THR*     4.8     0.2    +      -       -      -
    222A  THR*     3.5    11.3    -      -       -      -
    223A  MET*     2.8    34.2    +      -       -      +
    227A  ARG*     2.9    31.8    +      -       -      -
    255A  GLY*     5.7     1.4    -      -       -      -
    257A  GLN*     3.6    19.4    +      -       -      +
    258A  ILE*     3.8    22.2    -      -       +      +
    269A  TYR*     3.0    43.9    +      -       +      +
    270A  LEU      3.7     3.8    -      -       -      +
    272A  SER*     1.3    78.5    +      -       -      +
    274A  ILE*     1.3    57.3    +      -       -      +
    276A  ASP*     3.4     6.2    +      -       -      +
    277A  PHE*     3.0    23.7    +      -       -      +
----------------------------------------------------------
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Residues in contact with ILE 274 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     45A  ALA*     3.8    24.2    -      -       +      -
     49A  GLN*     3.4    29.8    -      -       +      +
     50A  ILE*     3.7    11.0    -      -       -      +
     52A  SER*     3.5    22.2    -      -       -      +
     53A  THR*     3.9    12.9    -      -       +      +
     63A  TYR*     4.1    14.6    -      -       +      +
    258A  ILE*     3.7    20.4    -      -       +      +
    270A  LEU*     3.0    18.8    +      -       +      +
    271A  ILE*     3.4    10.5    -      -       -      +
    273A  GLU*     1.3    73.9    -      -       -      +
    275A  ASN*     1.3    64.3    +      -       -      +
    277A  PHE*     3.2     3.3    +      -       +      +
    278A  ASP*     2.9    27.4    +      -       -      +
----------------------------------------------------------
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Residues in contact with ASN 275 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     53A  THR*     3.6    17.5    -      -       -      +
     56A  PHE      3.2    24.1    +      -       -      +
     57A  LYS*     3.4    35.6    -      -       +      +
    271A  ILE*     2.9    32.2    +      -       -      +
    272A  SER*     3.9     8.6    -      -       -      +
    274A  ILE*     1.3    73.4    -      -       -      +
    276A  ASP*     1.3    66.0    +      -       -      +
    278A  ASP*     3.3     4.7    +      -       -      -
    279A  ASP*     3.1    26.3    +      -       -      +
----------------------------------------------------------
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Residues in contact with ASP 276 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    223A  MET*     3.5    32.4    -      -       +      +
    227A  ARG*     2.7    20.8    +      -       -      -
    228A  GLY      3.7     9.5    -      -       -      +
    229A  ASN*     4.3    10.4    -      -       -      +
    231A  LEU*     3.6    26.7    -      -       -      +
    232A  SER*     4.6     1.9    +      -       -      -
    272A  SER      3.3    12.3    +      -       -      +
    273A  GLU      3.4     9.0    -      -       -      +
    274A  ILE      3.2     0.4    -      -       -      -
    275A  ASN*     1.3    76.3    -      -       -      +
    277A  PHE*     1.3    65.0    +      -       -      +
    279A  ASP*     3.0    24.6    +      -       -      +
    280A  ALA*     3.1    11.1    +      -       -      +
----------------------------------------------------------
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Residues in contact with PHE 277 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     40A  LEU*     3.8    28.9    -      -       +      -
     41A  ILE      3.4    26.5    -      -       -      -
     42A  SER*     3.4    31.9    -      -       -      -
     63A  TYR*     3.5    24.0    -      -       -      -
    231A  LEU*     4.2    13.0    -      -       +      -
    253A  SER      4.4     2.0    -      -       -      -
    255A  GLY*     3.7    23.8    -      -       -      -
    258A  ILE*     3.9     9.4    -      -       +      -
    273A  GLU      3.0    14.6    +      -       -      +
    274A  ILE*     3.2    10.5    +      -       +      +
    276A  ASP*     1.3    75.5    +      -       -      +
    278A  ASP*     1.3    58.2    +      -       -      +
    280A  ALA*     2.9    21.2    +      -       +      +
    281A  ILE*     3.0    20.2    +      -       +      +
    298A  VAL*     3.7    16.6    -      -       +      -
----------------------------------------------------------
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Residues in contact with ASP 278 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     53A  THR*     4.5     7.0    -      -       +      -
     57A  LYS*     2.6    28.2    +      -       -      +
     61A  PRO*     3.4     8.8    -      -       -      +
     62A  ASN*     2.8    54.4    +      -       -      +
     63A  TYR*     3.1    34.0    +      -       +      -
    274A  ILE      2.9    17.0    +      -       -      +
    275A  ASN      3.7     2.9    -      -       -      +
    276A  ASP      3.2     0.4    -      -       -      -
    277A  PHE*     1.3    72.7    -      -       -      +
    279A  ASP*     1.3    64.7    +      -       -      +
    281A  ILE*     3.3    12.2    +      -       -      +
    282A  GLY      3.1     8.1    +      -       -      -
----------------------------------------------------------
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Residues in contact with ASP 279 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     57A  LYS*     2.7    33.8    +      -       -      -
     62A  ASN*     4.2     4.5    +      -       -      +
    229A  ASN*     5.6     6.1    -      -       +      +
    232A  SER*     3.3    10.5    -      -       -      +
    275A  ASN      3.1    11.6    +      -       -      +
    276A  ASP*     3.0    18.5    +      -       -      +
    278A  ASP*     1.3    76.1    -      -       -      +
    280A  ALA*     1.3    63.7    +      -       -      +
    282A  GLY*     3.1     2.9    +      -       -      -
    283A  THR*     3.0    23.9    +      -       -      -
----------------------------------------------------------
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Residues in contact with ALA 280 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     40A  LEU*     4.0    13.5    -      -       +      +
    231A  LEU*     3.8    34.5    -      -       +      +
    232A  SER*     3.3    14.5    +      -       -      +
    235A  THR*     5.0     7.1    -      -       -      +
    276A  ASP      3.1     5.3    +      -       -      +
    277A  PHE*     2.9    16.2    +      -       +      +
    279A  ASP*     1.3    76.3    -      -       -      +
    281A  ILE*     1.3    61.9    +      -       -      +
    283A  THR*     3.2     5.5    +      -       -      -
    284A  ALA*     3.0    23.2    +      -       -      +
----------------------------------------------------------
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Residues in contact with ILE 281 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     40A  LEU*     3.8    11.9    -      -       +      -
     62A  ASN*     3.9     9.6    -      -       +      +
     63A  TYR*     3.6    40.8    -      -       +      -
     66A  PHE*     3.7    16.8    -      -       +      -
    277A  PHE*     3.0    32.0    +      -       +      +
    278A  ASP*     3.4    20.6    -      -       -      +
    279A  ASP      3.2     0.2    -      -       -      -
    280A  ALA*     1.3    76.4    -      -       -      +
    282A  GLY*     1.3    57.4    +      -       -      +
    284A  ALA*     3.2     2.8    +      -       -      +
    285A  LEU*     2.8    56.3    +      -       +      +
    296A  VAL*     5.8     0.2    -      -       +      -
    298A  VAL*     4.0    15.0    -      -       +      -
----------------------------------------------------------
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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
----------------------------------------------------------
     62A  ASN*     3.4    30.0    -      -       -      +
     65A  GLN*     4.6     1.6    +      -       -      -
    278A  ASP      3.1     4.9    +      -       -      -
    279A  ASP      3.1     6.4    +      -       -      -
    281A  ILE*     1.3    80.6    -      -       -      +
    283A  THR*     1.3    54.9    +      -       -      +
    285A  LEU*     4.0     4.2    -      -       -      +
    286A  ALA*     2.9    33.3    +      -       -      +
----------------------------------------------------------
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Residues in contact with THR 283 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    232A  SER*     3.2    38.2    +      -       -      +
    235A  THR*     4.8     6.7    -      -       +      -
    236A  ASP*     3.3    40.5    +      -       +      +
    239A  ILE*     5.1     1.3    -      -       +      +
    279A  ASP      3.0     6.5    +      -       -      -
    280A  ALA*     3.5     9.0    -      -       -      -
    281A  ILE      3.2     0.2    -      -       -      -
    282A  GLY*     1.3    76.0    -      -       -      +
    284A  ALA*     1.3    62.9    +      -       -      +
    286A  ALA*     3.8     4.9    -      -       -      +
    287A  PHE*     3.3    21.7    +      -       -      +
----------------------------------------------------------
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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
----------------------------------------------------------
     38A  ILE*     4.1    27.7    -      -       +      +
     40A  LEU*     3.9    20.4    -      -       +      -
    235A  THR*     5.0     3.8    -      -       +      -
    239A  ILE*     4.8     3.6    -      -       -      -
    280A  ALA      3.0    17.0    +      -       -      +
    281A  ILE      3.6     3.4    -      -       -      +
    283A  THR*     1.3    77.8    -      -       -      +
    285A  LEU*     1.3    58.5    +      -       -      +
    287A  PHE*     3.4     5.5    +      -       -      +
    288A  ALA*     2.9    28.9    +      -       -      +
    296A  VAL*     4.0    10.8    -      -       +      +
----------------------------------------------------------
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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
----------------------------------------------------------
     62A  ASN      4.0     2.5    -      -       -      +
     65A  GLN*     3.6    51.1    -      -       +      +
     66A  PHE*     3.9    16.2    -      -       +      -
    281A  ILE*     2.8    39.6    +      -       +      +
    282A  GLY      4.0     2.5    -      -       -      +
    284A  ALA*     1.3    73.5    -      -       -      +
    286A  ALA*     1.3    62.3    +      -       -      +
    288A  ALA*     4.2     1.6    -      -       -      -
    289A  LYS*     2.8    38.6    +      -       +      +
    296A  VAL*     4.0    17.9    -      -       +      -
    347A  TYR*     3.9    34.5    -      -       +      -
----------------------------------------------------------
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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
----------------------------------------------------------
     65A  GLN*     5.4     0.6    +      -       -      +
    282A  GLY      2.9    17.9    +      -       -      +
    283A  THR*     3.8     6.3    -      -       -      +
    285A  LEU*     1.3    77.7    -      -       -      +
    287A  PHE*     1.3    63.2    +      -       -      +
    289A  LYS*     4.3     5.0    -      -       -      +
    290A  LYS*     3.4    19.6    +      -       -      +
----------------------------------------------------------
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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
----------------------------------------------------------
     36A  ASN*     5.0     0.2    -      -       -      -
     38A  ILE*     4.5     2.2    -      -       +      -
    236A  ASP*     5.3     4.0    -      -       -      +
    239A  ILE*     3.5    43.5    -      -       +      -
    243A  SER*     5.2     6.1    -      -       -      -
    249A  PHE*     3.6    23.8    -      +       -      -
    283A  THR      3.3    11.1    +      -       -      +
    284A  ALA      3.8     5.2    -      -       -      +
    285A  LEU      3.2     0.2    -      -       -      -
    286A  ALA*     1.3    77.6    -      -       -      +
    288A  ALA*     1.3    63.1    +      -       -      +
    290A  LYS*     3.2     7.3    +      -       +      +
    291A  ASP*     2.8    51.8    +      -       +      +
    294A  THR*     3.5    26.5    -      -       +      -
----------------------------------------------------------
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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
----------------------------------------------------------
    284A  ALA      2.9    18.6    +      -       -      +
    285A  LEU*     3.8     4.7    -      -       -      +
    287A  PHE*     1.3    83.2    -      -       -      +
    289A  LYS*     1.3    55.9    -      -       -      +
    291A  ASP*     3.8     0.6    -      -       -      +
    292A  GLY*     2.8    31.2    +      -       -      -
    293A  ASN      4.5     0.3    +      -       -      -
    294A  THR*     3.9    25.3    +      -       +      +
    296A  VAL*     3.5    24.2    -      -       +      -
    347A  TYR*     4.4    11.9    -      -       +      -
----------------------------------------------------------
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Residues in contact with LYS 289 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     65A  GLN*     2.8    43.3    +      -       -      +
    285A  LEU*     2.8    26.1    +      -       -      +
    286A  ALA*     4.3     4.9    -      -       -      +
    288A  ALA*     1.3    73.0    -      -       -      +
    290A  LYS*     1.3    62.0    +      -       -      +
    292A  GLY*     4.0     6.3    +      -       -      -
    347A  TYR*     3.1    50.5    +      -       +      +
----------------------------------------------------------
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Residues in contact with LYS 290 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    286A  ALA      3.4    15.2    +      -       -      +
    287A  PHE*     3.2     7.4    +      -       +      +
    289A  LYS*     1.3    80.0    -      -       -      +
    291A  ASP*     1.3    66.6    +      -       -      +
    292A  GLY*     3.5     0.9    +      -       -      -
----------------------------------------------------------
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Residues in contact with ASP 291 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     36A  ASN*     3.7     8.0    +      -       -      -
    287A  PHE*     2.8    48.3    +      -       +      +
    288A  ALA      3.8     2.5    -      -       -      +
    290A  LYS*     1.3    77.3    -      -       -      +
    292A  GLY*     1.3    55.6    +      -       -      +
    293A  ASN*     2.8    35.8    +      -       -      +
    294A  THR*     2.8    22.8    +      -       -      +
----------------------------------------------------------
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Residues in contact with GLY 292 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    288A  ALA      2.8    19.7    +      -       -      -
    289A  LYS*     4.4     6.3    -      -       -      -
    290A  LYS      3.3     2.3    -      -       -      -
    291A  ASP*     1.3    71.7    -      -       -      +
    293A  ASN*     1.3    57.3    +      -       -      +
    294A  THR      3.6     2.2    -      -       -      -
    349A  PRO*     3.8    17.1    -      -       -      +
----------------------------------------------------------
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A short description of the analytical approach
The contact analysis used in this page is based upon the approach developed in: Sobolev V., Wade R.C., Vriend G. and Edelman M. PROTEINS (1996) 25, 120-129. Contact legitimacy depends on the hydrophobic-hydrophilic properties of the contacting atoms. In order to define it, for each inter-atomic contact, eight atom classes have been introduced:


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

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

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