Contacts of the helix formed by residues 385 - 410 (chain B) in PDB entry 4PKO


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 THR 385 (chain B).
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     76A  GLU*     4.0    11.7    -      -       +      +
     77A  VAL*     6.1     0.7    -      -       -      -
     80A  LYS*     4.4    15.7    -      -       +      +
    506A  TYR*     3.7    26.2    -      -       +      +
    509A  SER*     3.4    24.2    +      -       -      +
    510A  VAL*     3.9    14.6    -      -       +      +
    383B  ALA*     3.7     3.7    -      -       -      +
    384B  ALA*     1.3    81.9    -      -       -      +
    386B  GLU*     1.3    59.2    +      -       -      +
    387B  VAL*     3.7    10.2    -      -       -      +
    388B  GLU*     3.4    12.6    +      -       -      +
    389B  MET*     3.1    28.0    +      -       -      +
----------------------------------------------------------
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Residues in contact with GLU 386 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     76A  GLU*     3.7    10.0    +      -       -      +
     80A  LYS*     5.6     4.2    -      -       -      +
    179B  ASP*     5.4     7.4    -      -       -      +
    385B  THR*     1.3    72.3    -      -       -      +
    387B  VAL*     1.3    61.2    +      -       +      +
    389B  MET*     3.2     9.9    +      -       +      +
    390B  LYS*     3.1    52.3    +      -       +      +
----------------------------------------------------------
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Residues in contact with VAL 387 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     73A  MET*     5.8     4.9    -      -       +      -
     76A  GLU*     3.1    35.6    +      -       -      +
    510A  VAL*     3.9    13.9    -      -       +      -
    513A  LEU*     4.2    12.8    -      -       +      +
     46B  ALA*     5.2     2.9    -      -       +      -
     47B  PRO      3.5    24.2    -      -       -      +
     48B  THR*     5.1     1.8    -      -       -      -
     49B  ILE*     4.2    21.0    +      -       +      +
    385B  THR*     3.7    11.7    -      -       -      +
    386B  GLU*     1.3    79.8    -      -       +      +
    388B  GLU*     1.3    63.0    +      -       -      +
    389B  MET      3.6     0.2    +      -       -      -
    390B  LYS*     3.7    17.3    +      -       -      +
    391B  GLU*     3.6    19.1    +      -       -      +
----------------------------------------------------------
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Residues in contact with GLU 388 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    117A  LYS*     3.3    29.2    +      -       -      -
    121A  ASP*     5.0     0.3    -      -       -      +
    509A  SER*     3.2    19.8    +      -       -      +
    513A  LEU*     3.5    23.8    -      -       +      -
    383B  ALA*     3.9     7.3    -      -       +      +
    384B  ALA*     3.5    21.7    +      -       -      +
    385B  THR*     3.4    16.1    +      -       -      +
    386B  GLU      3.3     0.4    -      -       -      -
    387B  VAL*     1.3    80.2    -      -       -      +
    389B  MET*     1.3    60.1    +      -       -      +
    390B  LYS      3.4     0.2    -      -       -      -
    391B  GLU*     3.7     8.6    +      -       -      +
    392B  LYS*     3.0    34.0    +      -       +      +
----------------------------------------------------------
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Residues in contact with MET 389 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    179B  ASP*     3.8    29.4    -      -       +      +
    180B  GLY*     3.1    38.1    -      -       -      +
    381B  VAL*     3.5    17.9    -      -       -      +
    382B  GLY*     3.6     3.8    -      -       -      -
    383B  ALA*     3.1    41.5    -      -       +      +
    385B  THR      3.1    12.9    +      -       -      +
    386B  GLU*     3.2    15.0    +      -       +      +
    388B  GLU*     1.3    76.2    -      -       -      +
    390B  LYS*     1.3    57.6    +      -       +      +
    392B  LYS*     3.2     2.2    +      -       -      +
    393B  LYS*     2.7    39.7    +      -       +      +
----------------------------------------------------------
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Residues in contact with LYS 390 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     42B  LYS*     5.4     0.8    -      -       -      +
     46B  ALA*     4.5     6.3    +      -       -      +
     47B  PRO      4.5     4.9    +      -       -      -
     48B  THR*     3.1    39.3    -      -       +      +
     49B  ILE      5.0     2.2    -      -       -      +
     50B  THR*     5.4     0.7    +      -       -      -
    179B  ASP*     6.2     0.2    -      -       -      +
    386B  GLU*     3.1    43.3    +      -       +      +
    387B  VAL*     4.1    17.6    -      -       -      +
    388B  GLU      3.4     0.4    -      -       -      -
    389B  MET*     1.3    77.8    -      -       +      +
    391B  GLU*     1.3    60.9    +      -       -      +
    393B  LYS*     4.3    16.9    +      -       -      +
    394B  ALA*     3.4    21.7    +      -       -      +
----------------------------------------------------------
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Residues in contact with GLU 391 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    114A  MET*     5.1     6.1    -      -       -      +
    513A  LEU*     4.6    19.2    -      -       +      +
     37B  ASN*     4.7     9.0    +      -       -      +
     49B  ILE      3.2    25.2    +      -       -      +
     50B  THR*     4.2     3.4    -      -       -      +
     51B  LYS*     4.1    26.4    -      -       +      +
    387B  VAL      3.6    10.5    +      -       -      +
    388B  GLU*     4.1    10.2    -      -       -      +
    389B  MET      3.3     0.2    -      -       -      -
    390B  LYS*     1.3    76.8    -      -       -      +
    392B  LYS*     1.3    65.6    +      -       -      +
    394B  ALA*     3.4     6.3    +      -       +      +
    395B  ARG*     2.4    70.9    +      -       -      +
----------------------------------------------------------
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Residues in contact with LYS 392 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    155B  ASP*     3.6    23.7    +      -       -      -
    158B  VAL*     4.7     8.3    -      -       -      -
    183B  LEU      5.6     1.4    +      -       -      -
    185B  ASP*     3.6    19.1    +      -       -      -
    381B  VAL*     3.9    16.2    -      -       +      -
    382B  GLY      3.6    20.7    +      -       -      +
    383B  ALA*     4.9     1.8    -      -       +      +
    388B  GLU*     3.0    25.4    +      -       +      +
    389B  MET*     3.5     7.4    -      -       -      +
    391B  GLU*     1.3    77.8    +      -       -      +
    393B  LYS*     1.3    64.8    +      -       -      +
    395B  ARG*     3.3    28.4    +      -       -      +
    396B  VAL*     3.0    30.7    +      -       +      +
----------------------------------------------------------
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Residues in contact with LYS 393 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    177B  VAL*     3.8    38.8    -      -       +      +
    178B  GLU      5.1     0.7    -      -       -      +
    179B  ASP*     4.1    20.9    -      -       -      +
    381B  VAL*     4.0    16.3    -      -       +      +
    389B  MET*     2.7    19.7    +      -       +      +
    390B  LYS*     4.3    18.5    +      -       -      +
    392B  LYS*     1.3    73.3    -      -       -      +
    394B  ALA*     1.3    61.5    +      -       -      +
    396B  VAL*     3.3     3.5    +      -       -      +
    397B  GLU*     2.8    49.1    +      -       -      +
----------------------------------------------------------
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Residues in contact with ALA 394 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     50B  THR*     4.7     4.3    -      -       -      +
     52B  ASP*     4.0    25.8    -      -       +      +
     55B  SER*     5.7     0.7    -      -       -      +
    390B  LYS      3.4    17.6    +      -       -      +
    391B  GLU*     3.6     7.4    -      -       -      +
    392B  LYS      3.2     0.6    -      -       -      -
    393B  LYS*     1.3    83.8    -      -       -      +
    395B  ARG*     1.3    58.1    +      -       +      +
    397B  GLU*     3.8     8.4    -      -       -      +
    398B  ASP*     2.8    36.6    +      -       -      +
----------------------------------------------------------
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Residues in contact with ARG 395 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    114A  MET*     5.3     6.1    -      -       -      +
     51B  LYS*     4.8    15.3    -      -       +      +
     52B  ASP*     6.1     0.7    -      -       +      +
    151B  SER      4.8     3.1    -      -       -      +
    152B  ALA*     2.8    47.8    +      -       +      +
    153B  ASN*     3.9    23.0    +      -       -      +
    155B  ASP*     4.3    15.8    +      -       -      +
    158B  VAL*     5.6     1.6    -      -       +      +
    391B  GLU*     2.4    52.1    +      -       +      +
    392B  LYS*     3.3    30.4    +      -       +      +
    394B  ALA*     1.3    74.6    -      -       +      +
    396B  VAL*     1.3    60.6    +      -       +      +
    398B  ASP*     3.6     9.5    -      -       -      +
    399B  ALA*     2.9    29.3    +      -       -      +
----------------------------------------------------------
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Residues in contact with VAL 396 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    158B  VAL*     4.2    32.5    -      -       +      -
    162B  ILE*     4.2     5.2    -      -       +      +
    177B  VAL*     3.3    23.6    -      -       +      -
    185B  ASP*     6.4     2.0    -      -       -      -
    379B  ILE*     4.9    13.5    -      -       +      -
    381B  VAL*     3.8    26.9    -      -       +      -
    392B  LYS*     3.0    26.4    +      -       +      +
    393B  LYS      3.6     4.7    -      -       -      +
    394B  ALA      3.3     0.2    -      -       -      -
    395B  ARG*     1.3    75.8    -      -       +      +
    397B  GLU*     1.3    55.8    +      -       -      +
    399B  ALA*     3.5     1.6    +      -       -      +
    400B  LEU*     2.7    33.3    +      -       +      +
----------------------------------------------------------
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Residues in contact with GLU 397 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    177B  VAL*     3.0    34.5    -      -       +      +
    393B  LYS*     2.8    44.1    +      -       -      +
    394B  ALA*     3.8     7.9    -      -       -      +
    396B  VAL*     1.3    74.3    -      -       -      +
    398B  ASP*     1.3    61.1    +      -       -      +
    400B  LEU*     4.0     6.3    -      -       -      -
    401B  HIS*     2.8    55.3    +      -       +      +
----------------------------------------------------------
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Residues in contact with ASP 398 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     52B  ASP*     3.1    36.4    -      -       -      +
     82B  ASN*     5.1     0.3    -      -       -      +
     86B  GLY      2.9    24.0    -      -       -      +
     87B  ASP*     3.3    20.2    -      -       -      +
    151B  SER*     3.1    15.9    +      -       -      +
    394B  ALA      2.8    22.1    +      -       -      +
    395B  ARG*     3.6    12.1    -      -       -      +
    397B  GLU*     1.3    77.8    -      -       -      +
    399B  ALA*     1.3    56.7    +      -       -      +
    401B  HIS*     3.4     3.3    +      -       -      +
    402B  ALA*     2.9    25.1    +      -       -      +
----------------------------------------------------------
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Residues in contact with ALA 399 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    148B  GLY      3.2    25.6    -      -       -      +
    151B  SER*     3.4    11.8    +      -       -      -
    152B  ALA*     3.9    10.5    -      -       +      +
    158B  VAL*     4.0     2.0    -      -       +      -
    162B  ILE*     3.6    17.7    -      -       +      -
    395B  ARG      2.9    18.4    +      -       -      +
    396B  VAL      3.8     1.6    -      -       -      +
    398B  ASP*     1.3    76.5    -      -       -      +
    400B  LEU*     1.3    57.9    +      -       -      +
    402B  ALA*     3.6     0.3    -      -       -      +
    403B  THR*     3.0    35.5    +      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 400 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    162B  ILE*     4.0    27.1    -      -       +      -
    166B  MET*     6.0     1.8    -      -       +      -
    175B  ILE*     3.6    41.3    -      -       +      +
    177B  VAL*     5.4     5.4    -      -       +      -
    379B  ILE*     5.1     0.9    -      -       +      -
    396B  VAL*     2.7    21.5    +      -       +      +
    397B  GLU*     3.6     9.2    -      -       -      +
    398B  ASP      3.2     0.2    -      -       -      -
    399B  ALA*     1.3    74.9    -      -       -      +
    401B  HIS*     1.3    73.2    +      -       +      +
    403B  THR*     2.9    18.6    +      -       -      +
    404B  ARG*     3.2    43.0    +      -       +      +
----------------------------------------------------------
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Residues in contact with HIS 401 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     82B  ASN*     5.3     4.0    -      -       -      -
     85B  ALA*     3.0    21.7    +      -       -      +
     86B  GLY*     3.2    29.3    +      -       -      -
    397B  GLU*     2.8    45.5    +      -       +      +
    398B  ASP*     3.8     3.8    -      -       -      +
    400B  LEU*     1.3    85.4    -      -       +      +
    402B  ALA*     1.3    57.5    +      -       -      +
    404B  ARG*     3.5     9.5    +      -       -      +
    405B  ALA*     3.0    29.7    +      -       -      +
----------------------------------------------------------
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Residues in contact with ALA 402 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     85B  ALA*     6.5     0.2    -      -       -      -
     87B  ASP*     4.2    11.9    -      -       +      -
    147B  VAL*     4.6     5.8    -      -       -      +
    151B  SER*     3.4    26.0    -      -       -      +
    398B  ASP      2.9    18.7    +      -       -      +
    399B  ALA      3.6     2.9    -      -       -      +
    401B  HIS*     1.3    76.0    -      -       -      +
    403B  THR*     1.3    55.8    +      -       -      +
    405B  ALA*     3.3     2.9    +      -       -      -
    406B  ALA*     2.7    36.9    +      -       -      +
    496B  PRO*     3.7    20.2    -      -       +      +
    499B  VAL*     5.1     0.7    -      -       -      -
----------------------------------------------------------
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Residues in contact with THR 403 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    144B  ILE*     3.7    14.1    -      -       +      +
    147B  VAL*     3.8     7.6    -      -       +      -
    148B  GLY*     3.4    31.4    -      -       -      +
    162B  ILE*     3.5    25.2    -      -       +      +
    166B  MET*     4.0    17.8    -      -       -      -
    399B  ALA      3.0    18.4    +      -       -      +
    400B  LEU*     2.9    18.0    +      -       -      +
    402B  ALA*     1.3    70.9    -      -       -      +
    404B  ARG*     1.3    65.6    +      -       -      +
    406B  ALA*     3.7     0.9    -      -       -      +
    407B  VAL*     2.9    31.6    +      -       -      +
----------------------------------------------------------
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Residues in contact with ARG 404 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    166B  MET*     5.0     9.2    -      -       -      -
    171B  LYS      5.6     3.6    +      -       -      -
    173B  GLY      4.0    14.1    +      -       -      -
    174B  VAL*     4.1     6.1    -      -       -      +
    175B  ILE*     3.5    38.8    +      -       -      +
    400B  LEU*     3.2    31.7    +      -       +      +
    401B  HIS*     3.6    13.7    -      -       -      +
    403B  THR*     1.3    84.3    +      -       -      +
    405B  ALA*     1.3    62.5    +      -       -      +
    407B  VAL*     3.5     7.0    +      -       -      +
    408B  GLU*     3.4    26.0    +      -       -      +
----------------------------------------------------------
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Residues in contact with ALA 405 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     85B  ALA*     5.3     5.6    -      -       +      +
    401B  HIS      3.0    19.7    +      -       -      +
    402B  ALA      3.7     3.8    -      -       -      +
    404B  ARG*     1.3    73.6    -      -       -      +
    406B  ALA*     1.3    65.9    +      -       -      +
    408B  GLU*     3.2    26.3    -      -       -      +
    409B  GLU*     3.2    12.1    +      -       -      +
    410B  GLY      4.6     0.2    -      -       -      +
    496B  PRO*     4.1     6.7    -      -       +      -
    498B  LYS*     3.5    33.5    -      -       +      +
    499B  VAL*     4.5     7.9    -      -       +      -
----------------------------------------------------------
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Residues in contact with ALA 406 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    138B  CYS*     3.8     9.5    -      -       -      +
    147B  VAL*     3.7    22.9    -      -       +      -
    402B  ALA      2.7    23.0    +      -       -      +
    403B  THR      3.7     4.0    -      -       -      +
    405B  ALA*     1.3    72.0    -      -       -      +
    407B  VAL*     1.3    58.9    +      -       -      +
    410B  GLY*     2.9    31.9    +      -       -      -
    411B  VAL*     3.8    13.7    -      -       +      -
    496B  PRO*     3.4    23.3    -      -       +      +
----------------------------------------------------------
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Residues in contact with VAL 407 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    138B  CYS*     4.3    23.9    +      -       -      +
    144B  ILE*     4.3    21.3    -      -       +      -
    166B  MET*     3.5    29.8    -      -       +      -
    171B  LYS*     5.2    13.2    -      -       +      -
    403B  THR      2.9    20.8    +      -       -      +
    404B  ARG*     3.7     6.5    -      -       -      +
    405B  ALA      3.2     0.2    -      -       -      -
    406B  ALA*     1.3    78.9    -      -       -      +
    408B  GLU*     1.3    65.2    +      -       +      +
    410B  GLY*     4.1     2.9    +      -       -      -
----------------------------------------------------------
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Residues in contact with GLU 408 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    404B  ARG*     3.4    15.3    +      -       -      +
    405B  ALA*     3.2    15.4    -      -       -      +
    407B  VAL*     1.3    85.5    -      -       +      +
    409B  GLU*     1.3    75.9    +      -       +      +
    410B  GLY      3.8     0.2    +      -       -      -
    498B  LYS*     3.1    35.4    +      -       -      +
----------------------------------------------------------
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Residues in contact with GLU 409 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    132B  LYS*     4.0    13.8    +      -       +      +
    135B  SER*     2.9    17.3    +      -       -      -
    405B  ALA      3.2    10.9    +      -       -      +
    408B  GLU*     1.3    85.7    -      -       +      +
    410B  GLY*     1.3    61.0    +      -       -      +
    497B  THR*     3.4    14.6    -      -       +      +
    498B  LYS*     3.7    28.1    +      -       +      +
    501B  ARG*     2.7    50.4    +      -       -      +
----------------------------------------------------------
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Residues in contact with GLY 410 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    135B  SER*     3.7     3.1    -      -       -      -
    136B  VAL      3.6    12.6    -      -       -      -
    137B  PRO*     4.5     2.2    -      -       -      -
    138B  CYS      4.3     9.0    -      -       -      -
    406B  ALA*     2.9    17.1    +      -       -      +
    407B  VAL      4.1     1.9    +      -       -      -
    408B  GLU      3.5     2.8    +      -       -      -
    409B  GLU*     1.3    76.1    -      -       -      +
    411B  VAL*     1.3    59.7    +      -       -      +
    496B  PRO*     3.6     0.9    -      -       -      +
    497B  THR*     2.7    34.5    +      -       -      -
----------------------------------------------------------
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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