Contacts of the helix formed by residues 274 - 297 (chain y) in PDB entry 3J45


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 VAL 274 (chain y).
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    188y  SER*     6.0     0.9    -      -       -      +
    271y  MET*     3.5    37.0    -      -       +      -
    272y  ALA*     4.5     1.1    -      -       -      +
    273y  GLY*     1.3    79.1    -      -       -      +
    275y  ILE*     1.4    78.2    +      -       +      +
    276y  PRO*     3.5     2.6    -      -       +      +
    277y  ALA*     4.4     0.5    -      -       -      +
    278y  ILE*     3.5    26.4    +      -       +      +
    411y  VAL*     3.3    29.8    -      -       +      +
    415y  ASP*     3.7    27.1    -      -       +      +
----------------------------------------------------------
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Residues in contact with ILE 275 (chain y). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    185y  ASN*     4.5    18.2    -      -       -      +
    187y  ILE*     5.3    13.5    -      -       +      -
    188y  SER*     5.5     3.6    -      -       -      +
    274y  VAL*     1.4    91.1    -      -       +      +
    276y  PRO*     1.3    69.3    -      -       +      +
    277y  ALA      3.3     0.7    +      -       -      -
    278y  ILE*     3.3    11.4    +      -       +      +
    279y  PHE*     3.3    30.0    +      -       +      -
    332y  TYR*     3.3    30.7    -      -       +      +
    415y  ASP*     4.8     5.2    -      -       -      +
----------------------------------------------------------
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Residues in contact with PRO 276 (chain y). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    273y  GLY*     3.8    12.8    -      -       -      +
    274y  VAL*     3.5    14.1    -      -       +      +
    275y  ILE*     1.3    94.7    -      -       +      +
    277y  ALA*     1.4    56.1    +      -       -      +
    279y  PHE*     3.6     3.7    +      -       -      +
    280y  ALA*     3.1    28.2    +      -       -      +
    329y  CYS*     3.5    31.0    -      -       +      +
    332y  TYR*     3.5    24.6    -      -       +      +
    333y  THR*     3.3    26.9    -      -       +      -
----------------------------------------------------------
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Residues in contact with ALA 277 (chain y). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    273y  GLY      3.3    22.0    -      -       -      +
    274y  VAL      4.0     0.6    +      -       -      +
    275y  ILE      3.3     0.6    -      -       -      -
    276y  PRO*     1.4    76.6    -      -       -      +
    278y  ILE*     1.4    65.3    +      -       +      +
    280y  ALA*     4.0     1.4    -      -       -      +
    281y  SER*     3.2    28.8    +      -       -      -
    325y  ILE*     5.0     3.2    -      -       +      +
    329y  CYS*     3.6     9.6    -      -       -      -
    381y  ILE*     3.8    24.9    -      -       +      -
    407y  LEU*     4.4    15.5    -      -       +      -
    408y  ILE*     6.1     1.3    -      -       +      -
----------------------------------------------------------
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Residues in contact with ILE 278 (chain y). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     67y  PHE*     6.4     0.7    -      -       -      -
     86y  ILE*     4.4     3.8    -      -       +      -
    187y  ILE*     3.5    37.7    -      -       +      -
    188y  SER*     4.6    18.4    -      -       -      +
    191y  ILE*     3.8    22.7    -      -       +      -
    274y  VAL*     3.5    21.5    +      -       +      +
    275y  ILE*     3.3    12.7    +      -       +      +
    277y  ALA*     1.4    78.5    -      -       +      +
    279y  PHE*     1.4    59.6    +      -       -      +
    281y  SER*     4.0     3.1    -      -       -      -
    282y  SER*     3.2    21.0    +      -       -      +
    408y  ILE*     4.4    24.0    -      -       +      -
    411y  VAL*     5.0    11.4    -      -       +      -
    412y  VAL*     5.3     6.3    -      -       +      -
----------------------------------------------------------
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Residues in contact with PHE 279 (chain y). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     39G  SER*     5.7     9.0    -      -       -      -
     86y  ILE*     3.4    42.5    -      -       +      +
     89y  SER*     4.2    20.4    -      -       -      -
     90y  ILE*     4.1    17.0    -      -       +      +
    187y  ILE*     3.7    20.0    -      -       +      -
    275y  ILE*     3.3    26.9    +      -       +      +
    276y  PRO      3.8     7.2    -      -       -      +
    277y  ALA      3.4     0.2    -      -       -      -
    278y  ILE*     1.4    73.9    -      -       -      +
    280y  ALA*     1.4    58.4    +      -       -      +
    282y  SER*     3.0     2.9    +      -       -      -
    283y  ILE*     2.9    32.9    +      -       -      +
    332y  TYR*     3.2    52.5    -      +       +      -
----------------------------------------------------------
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Residues in contact with ALA 280 (chain y). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     90y  ILE*     6.5     0.2    -      -       -      -
    276y  PRO      3.1    19.3    +      -       -      +
    277y  ALA      3.5     3.1    +      -       -      +
    278y  ILE      3.5     0.2    -      -       -      -
    279y  PHE*     1.4    74.8    -      -       -      +
    281y  SER*     1.3    57.9    +      -       -      +
    283y  ILE*     3.2    18.8    -      -       -      +
    284y  ILE*     3.7    12.1    +      -       -      +
    324y  ALA      5.4     0.2    -      -       -      +
    325y  ILE*     4.2    15.7    -      -       +      +
    328y  PHE*     3.3    34.8    -      -       +      +
    329y  CYS*     3.7    19.3    -      -       -      +
----------------------------------------------------------
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Residues in contact with SER 281 (chain y). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     67y  PHE*     4.0    28.3    -      -       -      -
     83y  MET*     4.5     2.0    -      -       -      +
    277y  ALA      3.2    16.0    +      -       -      -
    278y  ILE*     4.0     3.8    -      -       -      -
    279y  PHE      3.3     0.2    -      -       -      -
    280y  ALA*     1.3    75.7    -      -       -      +
    282y  SER*     1.3    64.6    +      -       -      +
    283y  ILE      3.3     0.2    -      -       -      -
    284y  ILE*     3.6     9.0    +      -       -      +
    285y  LEU*     3.6    27.0    +      -       -      +
    321y  TYR*     3.7    10.3    +      -       -      -
    325y  ILE*     3.6    17.4    -      -       -      +
    404y  THR*     5.8     0.9    -      -       -      +
----------------------------------------------------------
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Residues in contact with SER 282 (chain y). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     67y  PHE*     6.1     0.2    -      -       -      -
     83y  MET*     3.7    29.6    -      -       -      +
     86y  ILE*     3.6    42.2    -      -       -      +
     87y  SER*     3.7     5.8    +      -       -      -
    191y  ILE*     5.0     2.3    -      -       -      +
    278y  ILE*     3.2    13.5    +      -       -      +
    279y  PHE      3.0     8.7    +      -       -      -
    281y  SER*     1.3    79.7    -      -       -      +
    283y  ILE*     1.3    63.2    +      -       -      +
    285y  LEU      3.8     0.2    +      -       -      -
    286y  PHE*     3.3    23.0    +      -       -      +
----------------------------------------------------------
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Residues in contact with ILE 283 (chain y). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     86y  ILE*     5.5     0.4    -      -       -      +
     87y  SER*     4.0    35.2    -      -       -      +
     90y  ILE*     4.4    17.5    -      -       +      -
     91y  ILE*     4.1    20.2    -      -       +      -
    279y  PHE      2.9    14.7    +      -       -      +
    280y  ALA*     3.2    24.0    -      -       -      +
    282y  SER*     1.3    79.3    -      -       -      +
    284y  ILE*     1.3    61.5    +      -       -      +
    286y  PHE*     3.5     4.5    +      -       +      +
    287y  PRO*     3.2    22.4    -      -       +      +
    328y  PHE*     4.2    29.6    -      -       +      -
----------------------------------------------------------
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Residues in contact with ILE 284 (chain y). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    280y  ALA      3.8    11.0    -      -       -      +
    281y  SER*     3.6    11.0    +      -       -      +
    282y  SER      3.4     0.4    -      -       -      -
    283y  ILE*     1.3    80.3    -      -       +      +
    285y  LEU*     1.4    70.9    +      -       +      +
    287y  PRO*     3.7    10.0    -      -       +      +
    288y  ALA*     3.7    12.6    +      -       -      +
    310y  LEU*     4.4    14.9    -      -       +      +
    311y  GLN*     3.2    42.8    +      -       -      +
    320y  LEU      5.5     0.2    -      -       -      +
    321y  TYR*     4.2    14.8    -      -       +      -
    324y  ALA*     4.0    27.1    -      -       +      -
    328y  PHE*     4.9    11.9    -      -       +      -
----------------------------------------------------------
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Residues in contact with LEU 285 (chain y). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     60y  ILE*     4.6    13.0    -      -       +      +
     63y  MET*     3.8    49.6    -      -       +      -
     64y  PHE*     4.0    23.1    -      -       +      +
     67y  PHE*     3.9    29.4    -      -       +      -
     83y  MET*     4.4     3.1    -      -       +      -
    281y  SER      3.6    12.7    +      -       -      +
    282y  SER      4.3     2.0    -      -       -      +
    283y  ILE      3.4     0.2    -      -       -      -
    284y  ILE*     1.4    84.4    -      -       +      +
    286y  PHE*     1.3    63.3    +      -       -      +
    287y  PRO      3.5     0.4    -      -       -      -
    288y  ALA*     3.8     2.2    -      -       +      -
    289y  THR*     3.0    28.0    +      -       -      -
    311y  GLN*     4.0    18.2    -      -       +      +
----------------------------------------------------------
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Residues in contact with PHE 286 (chain y). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     64y  PHE*     4.9    10.8    -      +       -      -
     83y  MET*     4.2     4.3    -      -       +      -
     84y  PRO*     3.6    28.7    -      -       +      -
     87y  SER*     3.3    31.9    -      -       -      +
    127y  LEU*     3.9    34.3    -      -       +      -
    131y  GLN*     3.5    39.3    -      -       -      -
    282y  SER      3.3    10.5    +      -       -      +
    283y  ILE*     3.7     5.4    -      -       +      +
    284y  ILE      3.3     0.2    -      -       -      -
    285y  LEU*     1.3    78.2    -      -       -      +
    287y  PRO*     1.4    72.1    -      -       +      +
    289y  THR*     3.9     4.5    -      -       -      +
    290y  ILE*     3.6    34.8    +      -       +      +
----------------------------------------------------------
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Residues in contact with PRO 287 (chain y). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    283y  ILE*     3.2    20.6    -      -       +      +
    284y  ILE*     3.7     8.5    -      -       +      +
    286y  PHE*     1.4    94.8    -      -       +      +
    288y  ALA*     1.3    59.5    -      -       -      +
    290y  ILE*     3.5     5.3    +      -       +      +
    291y  ALA*     2.9    29.4    +      -       -      +
    307y  SER*     4.7     0.2    -      -       -      -
----------------------------------------------------------
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Residues in contact with ALA 288 (chain y). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     60y  ILE*     3.5    18.6    -      -       +      -
    284y  ILE      3.7    13.0    -      -       -      +
    285y  LEU*     3.5    13.7    -      -       +      +
    287y  PRO*     1.3    81.3    -      -       -      +
    289y  THR*     1.3    56.7    +      -       -      +
    291y  ALA*     3.3     4.2    +      -       -      +
    292y  SER*     3.0    30.5    +      -       -      -
    307y  SER*     3.1    29.7    +      -       -      +
    310y  LEU*     6.1     1.1    -      -       +      -
    311y  GLN*     5.4     3.6    -      -       +      -
----------------------------------------------------------
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Residues in contact with THR 289 (chain y). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     60y  ILE*     3.7    11.2    -      -       -      -
     61y  ILE*     4.1     8.8    -      -       -      -
     64y  PHE*     3.2    58.5    -      -       +      +
    131y  GLN*     5.1     1.3    -      -       -      +
    285y  LEU*     3.0    15.9    +      -       -      +
    286y  PHE*     3.9     8.1    -      -       +      +
    288y  ALA*     1.3    74.0    -      -       -      +
    290y  ILE*     1.4    76.8    +      -       +      +
    292y  SER*     3.4     3.9    +      -       -      -
    293y  TRP*     3.2    43.2    +      -       +      -
----------------------------------------------------------
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Residues in contact with ILE 290 (chain y). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    130y  PHE*     3.7    35.4    -      -       +      -
    131y  GLN*     3.4    39.3    -      -       +      +
    286y  PHE*     3.6    31.2    +      -       +      +
    287y  PRO*     3.5     8.4    +      -       +      +
    288y  ALA      3.3     0.4    -      -       -      -
    289y  THR*     1.4    84.5    -      -       +      +
    291y  ALA*     1.4    63.1    +      -       -      +
    293y  TRP*     3.1    20.4    +      -       +      +
    294y  PHE*     3.1    40.6    +      -       +      -
----------------------------------------------------------
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Residues in contact with ALA 291 (chain y). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    287y  PRO      2.9    18.6    +      -       -      +
    288y  ALA      3.5     5.2    -      -       -      +
    289y  THR      3.2     0.2    -      -       -      -
    290y  ILE*     1.4    76.5    -      -       -      +
    292y  SER*     1.4    52.9    +      -       -      +
    294y  PHE*     3.3     6.7    +      -       -      +
    295y  GLY      3.2    17.8    +      -       -      -
    300y  TRP*     4.0     4.9    -      -       -      +
    303y  LEU*     3.5    25.6    -      -       +      +
    304y  THR*     2.5    38.8    +      -       -      +
    307y  SER*     4.2     3.1    -      -       -      +
----------------------------------------------------------
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Residues in contact with SER 292 (chain y). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     57y  ARG*     4.7    12.7    -      -       -      +
     58y  GLY*     5.1     2.2    -      -       -      -
     60y  ILE*     3.5    22.0    -      -       -      +
     61y  ILE*     3.9    23.1    -      -       -      -
    288y  ALA      3.0    13.2    +      -       -      -
    289y  THR      3.5    10.3    -      -       -      -
    290y  ILE      3.3     0.2    -      -       -      -
    291y  ALA*     1.4    71.7    -      -       -      +
    293y  TRP*     1.3    60.1    +      -       -      +
    295y  GLY      3.3     0.9    +      -       -      -
    296y  GLY*     2.9    28.2    +      -       -      -
    304y  THR*     2.9    24.0    +      -       -      +
    307y  SER*     5.1     0.2    -      -       -      -
    308y  LEU*     5.6     0.2    -      -       -      +
----------------------------------------------------------
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Residues in contact with TRP 293 (chain y). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     53y  LEU*     5.9     0.4    -      -       -      +
     57y  ARG*     3.4    37.5    +      -       -      +
     61y  ILE*     3.6    24.9    -      -       +      +
     64y  PHE*     3.9    26.2    -      +       -      -
     72y  LEU*     4.5     7.2    -      -       +      -
     80y  LEU*     4.1    15.7    -      -       +      -
    131y  GLN*     3.7    35.7    -      -       +      -
    134y  GLY      4.6    10.5    -      -       -      +
    135y  ILE*     3.7    50.5    -      -       +      +
    138y  GLY*     4.2     6.6    -      -       -      -
    289y  THR*     3.2    25.2    +      -       +      -
    290y  ILE*     3.1    22.8    +      -       +      +
    292y  SER*     1.3    76.2    -      -       -      +
    294y  PHE*     1.4    64.5    +      -       +      +
    297y  GLY*     3.2    19.6    +      -       -      -
----------------------------------------------------------
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Residues in contact with PHE 294 (chain y). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    130y  PHE*     4.3    24.5    -      +       -      -
    133y  ILE*     5.0     6.7    -      -       +      -
    134y  GLY*     3.3    38.1    -      -       -      -
    137y  THR*     6.2     2.7    -      -       -      -
    138y  GLY*     5.8     2.2    -      -       -      -
    290y  ILE*     3.1    41.8    +      -       +      +
    291y  ALA*     3.3     7.2    +      -       -      +
    292y  SER      3.3     0.2    -      -       -      -
    293y  TRP*     1.4    78.4    -      -       +      +
    295y  GLY*     1.3    58.9    +      -       -      +
    297y  GLY      3.1     9.6    -      -       -      +
    298y  THR      3.9    17.0    -      -       -      -
    299y  GLY*     3.1    30.0    +      -       -      -
    300y  TRP*     3.7    26.5    -      +       +      +
    303y  LEU*     6.3     0.2    -      -       +      -
----------------------------------------------------------
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Residues in contact with GLY 295 (chain y). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    142y  MET*     5.4     2.4    -      -       -      +
    291y  ALA      3.2     9.1    +      -       -      -
    292y  SER      3.3     1.7    +      -       -      -
    294y  PHE*     1.3    76.0    -      -       -      +
    296y  GLY*     1.4    62.4    +      -       -      +
    297y  GLY      3.3     5.8    -      -       -      +
    300y  TRP      2.6    26.9    +      -       -      -
    301y  ASN*     3.8    15.9    -      -       -      +
    304y  THR*     4.3     5.8    -      -       -      -
----------------------------------------------------------
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Residues in contact with GLY 296 (chain y). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     57y  ARG*     4.1    24.2    -      -       -      -
    142y  MET*     3.4    26.0    -      -       -      +
    143y  PRO*     3.7    18.5    -      -       -      +
    292y  SER      2.9    19.7    +      -       -      -
    295y  GLY*     1.4    67.0    -      -       -      +
    297y  GLY*     1.3    64.7    +      -       -      +
----------------------------------------------------------
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Residues in contact with GLY 297 (chain y). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     57y  ARG*     4.8     0.8    -      -       -      +
    138y  GLY*     3.5    26.1    +      -       -      -
    141y  ASN*     5.7     1.8    -      -       -      -
    142y  MET*     5.3     4.7    -      -       -      +
    143y  PRO*     4.6     3.1    -      -       -      -
    293y  TRP      3.2    14.7    +      -       -      -
    294y  PHE      3.1    11.9    -      -       -      +
    295y  GLY*     3.3     7.6    -      -       -      +
    296y  GLY*     1.3    81.9    -      -       -      +
    298y  THR*     1.3    61.0    +      -       -      +
    299y  GLY      3.8     1.0    +      -       -      -
    301y  ASN*     5.2     1.0    -      -       -      +
----------------------------------------------------------
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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