Contacts of the helix formed by residues 385 - 410 (chain A) 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 A).
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    383A  ALA*     3.8     2.5    -      -       -      +
    384A  ALA*     1.3    88.0    -      -       +      +
    386A  GLU*     1.3    60.4    +      -       -      +
    387A  VAL*     3.6    17.3    -      -       +      +
    388A  GLU*     3.3    19.9    +      -       -      +
    389A  MET*     3.0    29.7    +      -       -      +
----------------------------------------------------------
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Residues in contact with GLU 386 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     46A  ALA*     5.5    10.1    +      -       -      +
    385A  THR*     1.3    75.5    -      -       -      +
    387A  VAL*     1.3    64.4    +      -       +      +
    389A  MET*     3.4    16.5    +      -       +      +
    390A  LYS*     3.4    33.2    +      -       +      +
----------------------------------------------------------
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Residues in contact with VAL 387 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     46A  ALA*     4.7    12.6    -      -       +      -
     47A  PRO*     3.6    25.6    -      -       +      +
     49A  ILE*     4.1    34.7    -      -       +      +
    385A  THR*     3.6    16.8    -      -       -      +
    386A  GLU*     1.3    79.8    -      -       +      +
    388A  GLU*     1.3    64.4    +      -       +      +
    390A  LYS*     3.9    12.6    +      -       -      +
    391A  GLU*     3.9    13.2    +      -       -      +
----------------------------------------------------------
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Residues in contact with GLU 388 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    383A  ALA*     4.0     8.0    -      -       +      +
    384A  ALA*     3.3    30.7    +      -       -      +
    385A  THR*     3.3    18.8    +      -       -      +
    387A  VAL*     1.3    80.7    -      -       +      +
    389A  MET*     1.3    60.1    +      -       -      +
    390A  LYS      3.4     0.2    -      -       -      -
    391A  GLU*     3.7    12.3    +      -       -      +
    392A  LYS*     3.0    36.4    +      -       +      +
----------------------------------------------------------
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Residues in contact with MET 389 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    179A  ASP*     3.7    29.6    -      -       +      +
    180A  GLY*     3.3    30.1    -      -       -      +
    381A  VAL*     3.5    27.4    -      -       -      +
    382A  GLY      4.3     0.4    -      -       -      -
    383A  ALA*     3.6    33.0    -      -       +      +
    385A  THR      3.0    15.6    +      -       -      +
    386A  GLU*     3.5    11.9    -      -       +      +
    387A  VAL      3.3     0.2    -      -       -      -
    388A  GLU*     1.3    77.0    -      -       -      +
    390A  LYS*     1.3    58.6    +      -       +      +
    392A  LYS*     4.1     0.9    -      -       -      -
    393A  LYS*     2.6    39.8    +      -       +      +
----------------------------------------------------------
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Residues in contact with LYS 390 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     46A  ALA*     3.6     9.3    +      -       -      +
     47A  PRO      2.7    29.8    +      -       -      -
     48A  THR*     2.7    41.9    +      -       +      +
     49A  ILE      4.5     0.9    -      -       -      +
     50A  THR*     5.0     1.1    +      -       -      -
    386A  GLU*     3.4    33.7    +      -       +      +
    387A  VAL*     3.9    15.4    +      -       -      +
    388A  GLU      3.4     0.2    -      -       -      -
    389A  MET*     1.3    79.6    -      -       +      +
    391A  GLU*     1.3    58.0    +      -       -      +
    393A  LYS*     4.3    17.2    +      -       -      +
    394A  ALA*     3.1    28.2    +      -       -      +
----------------------------------------------------------
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Residues in contact with GLU 391 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     37A  ASN*     4.3    18.4    +      -       -      +
     49A  ILE*     3.1    26.1    +      -       +      +
     50A  THR*     4.3     2.7    -      -       -      +
     51A  LYS*     4.2    21.5    -      -       +      +
    153A  ASN*     5.6     0.7    +      -       -      -
    387A  VAL      3.9     5.9    +      -       -      +
    388A  GLU*     3.7    16.5    +      -       -      +
    389A  MET      3.2     0.4    -      -       -      -
    390A  LYS*     1.3    77.0    -      -       -      +
    392A  LYS*     1.3    69.3    +      -       -      +
    394A  ALA*     3.5     4.7    +      -       -      +
    395A  ARG*     2.8    65.4    +      -       +      +
----------------------------------------------------------
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Residues in contact with LYS 392 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    155A  ASP*     4.1    11.0    -      -       -      -
    158A  VAL*     5.2     8.3    -      -       -      -
    183A  LEU      5.4     1.8    +      -       -      -
    185A  ASP*     3.9    19.0    +      -       -      -
    381A  VAL*     3.3    20.2    -      -       +      -
    382A  GLY      3.4    21.1    +      -       -      +
    383A  ALA*     4.8     1.7    -      -       +      +
    388A  GLU*     3.0    27.8    +      -       +      +
    389A  MET*     3.7     6.7    -      -       -      +
    391A  GLU*     1.3    78.2    +      -       -      +
    393A  LYS*     1.3    63.8    +      -       -      +
    395A  ARG*     3.2    33.0    +      -       +      +
    396A  VAL*     3.1    29.4    +      -       +      +
----------------------------------------------------------
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Residues in contact with LYS 393 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    177A  VAL*     4.8    14.4    -      -       +      +
    179A  ASP*     2.9    31.0    -      -       -      +
    381A  VAL*     4.0    21.2    -      -       +      +
    389A  MET      2.6    21.9    +      -       -      +
    390A  LYS*     4.3    16.5    +      -       -      +
    392A  LYS*     1.3    73.1    -      -       -      +
    394A  ALA*     1.3    62.1    +      -       -      +
    396A  VAL*     3.3     3.8    +      -       -      +
    397A  GLU*     3.0    59.5    +      -       +      +
----------------------------------------------------------
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Residues in contact with ALA 394 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     50A  THR*     4.3    15.5    -      -       -      +
     51A  LYS      6.1     0.2    -      -       -      +
     52A  ASP*     4.4    15.2    -      -       +      +
     55A  SER*     5.7     0.7    -      -       -      +
    390A  LYS      3.1    21.8    +      -       -      +
    391A  GLU      3.8     5.2    -      -       -      +
    392A  LYS      3.2     0.4    -      -       -      -
    393A  LYS*     1.3    82.5    -      -       -      +
    395A  ARG*     1.3    58.3    +      -       +      +
    397A  GLU*     3.5    10.4    +      -       -      +
    398A  ASP*     3.0    35.1    +      -       -      +
----------------------------------------------------------
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Residues in contact with ARG 395 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     51A  LYS*     5.1    12.6    -      -       +      +
     52A  ASP      6.2     0.4    -      -       -      +
    151A  SER      5.5     1.3    -      -       -      +
    152A  ALA*     3.3    34.4    +      -       +      +
    153A  ASN*     3.9    26.3    +      -       +      +
    155A  ASP*     2.9    33.5    +      -       -      -
    158A  VAL*     5.4     1.1    -      -       +      -
    391A  GLU*     2.8    47.6    +      -       +      +
    392A  LYS*     3.2    31.4    -      -       -      +
    393A  LYS      3.3     0.2    -      -       -      -
    394A  ALA*     1.3    74.6    -      -       +      +
    396A  VAL*     1.3    62.2    +      -       +      +
    398A  ASP*     3.4    11.2    -      -       -      +
    399A  ALA*     3.0    28.9    +      -       -      +
----------------------------------------------------------
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Residues in contact with VAL 396 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    158A  VAL*     4.5    30.3    -      -       +      -
    162A  ILE*     4.6     4.2    -      -       +      +
    177A  VAL*     3.3    27.4    -      -       +      -
    185A  ASP*     6.2     0.7    -      -       -      -
    379A  ILE*     4.5    20.2    -      -       +      -
    381A  VAL*     3.7    25.8    -      -       +      -
    392A  LYS*     3.1    18.1    +      -       +      +
    393A  LYS*     3.6     8.5    -      -       -      +
    394A  ALA      3.3     0.2    -      -       -      -
    395A  ARG*     1.3    75.6    -      -       +      +
    397A  GLU*     1.3    64.5    +      -       -      +
    399A  ALA*     3.6     2.1    +      -       -      +
    400A  LEU*     3.2    22.6    +      -       +      +
----------------------------------------------------------
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Residues in contact with GLU 397 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    177A  VAL*     3.2    33.3    -      -       +      +
    393A  LYS*     3.0    44.2    +      -       -      +
    394A  ALA*     3.7     7.8    -      -       -      +
    395A  ARG      3.3     0.2    -      -       -      -
    396A  VAL*     1.3    77.8    -      -       -      +
    398A  ASP*     1.3    58.9    +      -       -      +
    400A  LEU*     3.3    10.9    +      -       -      +
    401A  HIS*     2.5    41.0    +      -       +      -
----------------------------------------------------------
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Residues in contact with ASP 398 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     52A  ASP*     3.1    38.1    -      -       -      +
     82A  ASN*     5.5     0.2    -      -       -      +
     86A  GLY      3.6    19.7    -      -       -      +
     87A  ASP*     3.9    19.2    -      -       -      +
    151A  SER*     3.2    17.9    +      -       -      +
    394A  ALA      3.0    23.2    +      -       -      +
    395A  ARG*     3.4    13.2    -      -       -      +
    396A  VAL      3.3     0.2    -      -       -      -
    397A  GLU*     1.3    78.2    -      -       -      +
    399A  ALA*     1.3    61.5    +      -       -      +
    400A  LEU      3.3     0.7    +      -       -      -
    401A  HIS*     3.4     6.4    +      -       -      +
    402A  ALA*     3.3    15.1    +      -       -      +
----------------------------------------------------------
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Residues in contact with ALA 399 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    148A  GLY*     3.2    26.9    -      -       -      +
    151A  SER*     3.6    12.3    +      -       -      -
    152A  ALA*     3.7    10.5    -      -       +      +
    158A  VAL*     4.1     3.4    -      -       +      -
    162A  ILE*     3.9    16.4    -      -       +      -
    395A  ARG      3.0    17.0    +      -       -      +
    396A  VAL      4.1     2.0    -      -       -      +
    398A  ASP*     1.3    75.8    -      -       -      +
    400A  LEU*     1.3    62.8    +      -       -      +
    402A  ALA*     3.5     1.8    +      -       -      +
    403A  THR*     3.3    28.6    +      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 400 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    162A  ILE*     4.0    25.5    -      -       +      +
    166A  MET*     6.0     0.9    -      -       +      -
    175A  ILE*     3.9    41.5    -      -       +      +
    177A  VAL*     5.4     7.6    -      -       +      -
    379A  ILE*     5.1     2.0    -      -       +      -
    396A  VAL*     3.2    14.7    +      -       +      +
    397A  GLU*     3.4    13.0    -      -       -      +
    398A  ASP      3.1     0.4    -      -       -      -
    399A  ALA*     1.3    77.9    -      -       -      +
    401A  HIS*     1.3    70.9    +      -       +      +
    403A  THR*     2.8    20.8    +      -       -      +
    404A  ARG*     3.3    46.3    +      -       +      +
----------------------------------------------------------
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Residues in contact with HIS 401 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     82A  ASN      5.3     3.1    -      -       -      -
     85A  ALA      3.0    28.0    -      -       -      +
     86A  GLY*     4.0    15.9    +      -       -      -
    397A  GLU*     2.5    38.8    +      -       +      -
    398A  ASP*     3.8     6.7    -      -       -      +
    400A  LEU*     1.3    85.2    -      -       +      +
    402A  ALA*     1.3    57.3    +      -       -      +
    404A  ARG*     3.4    11.6    +      -       -      +
    405A  ALA*     2.9    29.3    +      -       -      +
----------------------------------------------------------
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Residues in contact with ALA 402 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     85A  ALA      6.2     0.2    -      -       -      -
     87A  ASP*     4.4     9.0    -      -       +      -
    147A  VAL*     4.6     5.4    -      -       +      +
    151A  SER*     3.3    37.2    -      -       -      +
    398A  ASP      3.3     3.2    +      -       -      +
    399A  ALA      3.8     3.8    -      -       -      +
    400A  LEU      3.2     0.8    -      -       -      -
    401A  HIS*     1.3    75.9    -      -       -      +
    403A  THR*     1.3    55.4    +      -       -      +
    405A  ALA*     3.2     2.1    +      -       -      -
    406A  ALA*     2.6    38.1    +      -       -      +
    496A  PRO*     3.5    24.9    -      -       +      +
    499A  VAL*     5.0     1.3    -      -       -      -
----------------------------------------------------------
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Residues in contact with THR 403 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    144A  ILE*     3.7    16.8    -      -       +      +
    147A  VAL*     3.6    22.0    -      -       +      -
    148A  GLY*     3.7    14.4    -      -       -      -
    162A  ILE*     3.8    19.2    -      -       +      +
    166A  MET*     3.8    17.3    -      -       -      -
    399A  ALA      3.3    13.7    +      -       -      +
    400A  LEU*     2.8    22.3    +      -       -      +
    402A  ALA*     1.3    72.7    -      -       -      +
    404A  ARG*     1.3    59.0    +      -       -      +
    406A  ALA*     3.5     6.9    -      -       -      +
    407A  VAL*     2.7    42.0    +      -       -      +
----------------------------------------------------------
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Residues in contact with ARG 404 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    166A  MET*     4.9    11.5    -      -       -      +
    171A  LYS      5.8     3.7    +      -       -      -
    173A  GLY      4.6     4.0    +      -       -      -
    174A  VAL*     4.3     7.7    -      -       -      +
    175A  ILE*     3.6    41.8    +      -       -      +
    400A  LEU*     3.3    38.0    +      -       +      +
    401A  HIS*     3.4    15.5    +      -       -      +
    403A  THR*     1.3    84.7    +      -       -      +
    405A  ALA*     1.3    59.4    +      -       -      +
    407A  VAL*     3.5     7.7    +      -       -      +
    408A  GLU*     3.2    31.7    +      -       -      +
----------------------------------------------------------
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Residues in contact with ALA 405 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     85A  ALA*     5.3     5.8    -      -       -      +
    401A  HIS      2.9    17.4    +      -       -      +
    402A  ALA      3.6     3.6    -      -       -      +
    404A  ARG*     1.3    74.5    -      -       -      +
    406A  ALA*     1.3    66.6    +      -       -      +
    408A  GLU*     3.3    11.1    -      -       -      +
    409A  GLU*     3.1    28.1    +      -       -      +
    410A  GLY      4.0     1.2    +      -       -      +
    496A  PRO*     4.0     9.2    -      -       +      -
    498A  LYS*     4.0    27.7    -      -       +      +
    499A  VAL*     4.3     9.4    -      -       +      -
----------------------------------------------------------
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Residues in contact with ALA 406 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    138A  CYS*     3.4    13.6    -      -       -      +
    147A  VAL*     4.1    14.6    -      -       +      -
    402A  ALA      2.6    20.9    +      -       -      +
    403A  THR*     3.2     9.4    +      -       -      +
    405A  ALA*     1.3    74.2    -      -       -      +
    407A  VAL*     1.3    58.2    +      -       -      +
    410A  GLY*     2.9    33.4    +      -       -      -
    411A  VAL*     3.6    20.4    -      -       +      -
    496A  PRO*     3.5    13.6    -      -       +      +
----------------------------------------------------------
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Residues in contact with VAL 407 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    137A  PRO*     5.9     0.3    -      -       -      +
    138A  CYS*     3.9    23.2    +      -       -      +
    144A  ILE*     4.5    17.5    -      -       +      -
    166A  MET*     3.5    28.7    -      -       +      -
    171A  LYS*     4.1    25.1    -      -       +      -
    403A  THR      2.7    26.7    +      -       -      +
    404A  ARG*     3.6     6.5    -      -       -      +
    405A  ALA      3.2     0.2    -      -       -      -
    406A  ALA*     1.3    76.6    -      -       -      +
    408A  GLU*     1.3    66.8    +      -       +      +
    410A  GLY      4.2     1.7    +      -       -      -
----------------------------------------------------------
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Residues in contact with GLU 408 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    404A  ARG*     3.2    21.4    -      -       -      +
    405A  ALA*     3.3    10.0    -      -       -      +
    407A  VAL*     1.3    87.1    -      -       +      +
    409A  GLU*     1.3    72.5    +      -       +      +
    498A  LYS*     3.0    35.2    +      -       +      +
----------------------------------------------------------
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Residues in contact with GLU 409 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    132A  LYS*     2.9    27.9    +      -       +      +
    135A  SER*     2.8    17.7    +      -       -      -
    405A  ALA      3.1    12.7    +      -       -      +
    408A  GLU*     1.3    80.8    -      -       +      +
    410A  GLY*     1.3    60.4    +      -       -      +
    497A  THR*     3.6     7.8    -      -       +      +
    498A  LYS*     3.8    30.1    +      -       +      +
    501A  ARG*     2.8    42.8    +      -       -      +
----------------------------------------------------------
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Residues in contact with GLY 410 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    135A  SER*     3.7     2.7    -      -       -      -
    136A  VAL      3.2    14.8    -      -       -      -
    137A  PRO*     4.4     2.7    -      -       -      -
    138A  CYS      4.2     6.5    -      -       -      -
    405A  ALA      4.2     0.3    -      -       -      +
    406A  ALA*     2.9    20.0    +      -       -      +
    407A  VAL      4.2     0.8    +      -       -      -
    408A  GLU      3.5     2.2    +      -       -      -
    409A  GLU*     1.3    75.9    -      -       -      +
    411A  VAL*     1.3    58.3    -      -       -      +
    496A  PRO*     3.4     3.3    -      -       -      +
    497A  THR*     2.5    33.5    +      -       -      -
----------------------------------------------------------
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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