Contacts of the helix formed by residues 29 - 55 (chain 3) in PDB entry 3EXG


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 ARG 29 (chain 3).
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
      13  PHE*     3.1    29.8    -      -       -      -
      23  ALA      4.3    10.1    +      -       -      +
      33  ASN*     2.8    31.3    +      -       -      +
     283  THR*     1.3    72.4    -      -       -      +
     303  GLU*     1.3    70.8    +      -       -      +
     323  GLY*     3.6     0.9    +      -       -      -
     333  LEU*     3.3    39.6    +      -       -      +
    2953  MET*     5.0     1.6    -      -       -      +
    3003  LEU*     2.4    68.5    +      -       +      +
    3013  ALA*     3.5    14.8    -      -       -      +
    3053  GLU*     3.0    21.4    +      -       -      -
----------------------------------------------------------
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Residues in contact with GLU 30 (chain 3). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
      33  ASN      4.6     0.4    +      -       -      -
     283  THR*     3.2     6.6    +      -       -      +
     293  ARG*     1.3    89.9    -      -       -      +
     313  ASP*     1.3    61.1    +      -       -      +
     333  LEU*     3.6    16.6    -      -       +      +
     343  LYS*     3.7     7.8    +      -       -      +
----------------------------------------------------------
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Residues in contact with ASP 31 (chain 3). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     273  LEU*     3.8    11.0    -      -       +      -
     283  THR*     3.0    40.2    +      -       -      +
     303  GLU*     1.3    71.4    -      -       -      +
     323  GLY*     1.3    54.8    +      -       -      +
     333  LEU      3.0     4.0    -      -       -      -
     343  LYS*     2.6    37.2    +      -       -      +
     353  TYR*     3.0    37.1    +      -       +      -
    2343  ARG*     4.4     6.0    +      -       -      -
----------------------------------------------------------
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Residues in contact with GLY 32 (chain 3). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     273  LEU*     3.3    20.6    -      -       -      +
     283  THR      3.1     7.8    +      -       -      -
     313  ASP*     1.3    78.6    -      -       -      +
     333  LEU*     1.3    56.7    +      -       -      +
     343  LYS      3.2     0.4    -      -       -      -
     353  TYR*     3.6    13.0    -      -       -      -
     363  TYR*     3.2    19.6    +      -       -      +
    2913  LEU*     3.8     3.8    -      -       -      +
    2953  MET*     2.8    29.2    -      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 33 (chain 3). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     293  ARG*     3.3    45.1    +      -       -      +
     303  GLU*     3.6    11.9    -      -       +      +
     313  ASP      2.9     0.6    +      -       -      -
     323  GLY*     1.3    76.4    -      -       -      +
     343  LYS*     1.3    60.0    +      -       -      +
     363  TYR*     4.1     1.5    -      -       -      +
     373  ARG*     3.6    19.9    +      -       -      +
    2953  MET*     3.5    20.4    -      -       +      +
    3003  LEU      5.1     0.2    -      -       -      +
    3013  ALA*     3.9    21.3    -      -       +      -
    3053  GLU*     4.2     9.6    -      -       +      +
    3063  LEU*     4.6     8.3    -      -       +      -
    3093  ILE*     4.2    17.6    -      -       +      +
----------------------------------------------------------
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Residues in contact with LYS 34 (chain 3). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     303  GLU      3.7     6.9    +      -       -      +
     313  ASP*     2.6    19.5    +      -       -      +
     333  LEU*     1.3    80.8    -      -       -      +
     353  TYR*     1.3    74.4    +      -       -      +
     363  TYR      3.2     0.2    -      -       -      -
     373  ARG*     3.5     8.6    +      -       +      +
     383  MET*     2.9    49.5    +      -       +      +
----------------------------------------------------------
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Residues in contact with TYR 35 (chain 3). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     273  LEU*     4.0    15.9    -      -       +      -
     313  ASP*     3.0    25.5    +      -       +      -
     323  GLY*     3.6    15.5    -      -       -      +
     343  LYS*     1.3    84.7    -      -       -      +
     363  TYR*     1.3    51.6    +      -       -      +
     383  MET*     3.1    21.3    +      -       +      +
     393  MET*     2.7    40.2    +      -       -      +
     733  VAL*     4.1     9.1    -      -       -      +
     773  ALA*     3.8    21.8    -      -       +      +
    2303  ILE*     4.6    24.5    -      -       +      -
    2313  LEU*     5.0     4.5    -      -       +      -
    2343  ARG*     3.2    42.0    +      -       -      -
    2383  ARG*     4.8     2.6    +      -       -      -
    2913  LEU*     3.9    15.3    -      -       +      -
----------------------------------------------------------
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Residues in contact with TYR 36 (chain 3). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     323  GLY      3.2    17.1    +      -       -      +
     333  LEU      4.3     3.1    -      -       -      +
     353  TYR*     1.3    78.4    -      -       -      +
     373  ARG*     1.3    70.0    +      -       -      +
     393  MET*     2.9     8.8    +      -       +      +
     403  GLN*     2.8    34.3    +      -       +      +
    2883  ILE*     3.8    34.4    -      -       +      +
    2913  LEU*     3.7    16.3    -      -       +      +
    2923  LYS*     4.2    19.6    -      -       +      +
    2953  MET*     4.4     1.6    -      -       +      -
    3063  LEU*     3.6    51.6    +      -       +      +
    3093  ILE*     4.2    13.5    -      -       +      -
    3103  ASP*     2.9    33.7    +      -       -      -
----------------------------------------------------------
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Residues in contact with ARG 37 (chain 3). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     333  LEU      3.6    13.9    +      -       -      +
     343  LYS*     3.5     9.5    +      -       -      +
     353  TYR      3.5     0.2    -      -       -      -
     363  TYR*     1.3    80.0    -      -       -      +
     383  MET*     1.3    63.5    +      -       +      +
     403  GLN*     4.0     3.8    -      -       -      +
     413  THR*     2.9    37.0    +      -       -      +
    3093  ILE*     3.3    45.6    -      -       +      +
    3123  GLU*     3.2    45.4    +      -       -      +
    3133  VAL*     4.2     9.3    -      -       +      +
    3163  GLU*     6.0     0.2    +      -       -      -
----------------------------------------------------------
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Residues in contact with MET 38 (chain 3). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     343  LYS*     2.9    73.5    +      -       +      +
     353  TYR*     3.4    14.4    -      -       +      +
     363  TYR      2.9     0.8    +      -       -      -
     373  ARG*     1.3    76.4    -      -       +      +
     393  MET*     1.3    68.7    +      -       -      +
     413  THR*     3.1    14.9    +      -       -      -
     423  VAL*     3.1    15.3    +      -       -      +
     733  VAL*     3.3    27.8    -      -       +      +
     763  GLU*     5.7     6.5    -      -       -      -
     963  PHE*     4.3    18.3    -      -       +      -
     973  THR*     5.2    12.3    -      -       -      +
----------------------------------------------------------
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Residues in contact with MET 39 (chain 3). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     353  TYR      2.7    23.3    +      -       -      +
     363  TYR*     2.9     6.3    +      -       +      +
     383  MET*     1.3    70.5    -      -       -      +
     403  GLN*     1.3    56.3    +      -       -      +
     423  VAL*     3.0     5.9    +      -       -      +
     433  ARG*     2.8    27.9    +      -       -      +
     693  GLU*     3.8    24.5    -      -       +      +
     703  ALA*     4.1     5.8    -      -       -      -
     733  VAL*     3.4    28.5    -      -       +      +
    2303  ILE*     4.3    15.9    -      -       +      -
    2873  PRO      3.3    26.9    -      -       -      +
    2883  ILE*     3.6    29.2    -      -       +      +
    2913  LEU*     3.7    30.3    -      -       +      -
----------------------------------------------------------
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Residues in contact with GLN 40 (chain 3). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     363  TYR*     2.8    37.2    +      -       +      +
     373  ARG*     4.0     4.5    -      -       -      +
     393  MET*     1.3    72.2    -      -       -      +
     413  THR*     1.3    57.0    +      -       -      +
     433  ARG*     4.2    11.3    -      -       -      +
     443  ARG*     2.9    62.3    +      -       -      +
    2883  ILE*     3.7    33.2    -      -       +      +
    3093  ILE*     5.7     0.4    -      -       +      -
    3103  ASP*     3.3    34.3    +      -       -      +
    3133  VAL*     3.9    16.2    -      -       +      +
----------------------------------------------------------
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Residues in contact with THR 41 (chain 3). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     373  ARG*     2.9    25.5    +      -       -      +
     383  MET*     3.1     4.9    +      -       -      -
     403  GLN*     1.3    75.4    -      -       -      +
     423  VAL*     1.3    63.0    +      -       -      +
     453  MET*     3.1    25.6    +      -       +      +
     963  PHE*     3.3    33.2    -      -       +      -
    1023  VAL*     3.6    21.3    -      -       +      -
    3133  VAL*     3.4    23.1    -      -       +      +
    3163  GLU*     5.6     6.3    -      -       +      +
    3173  ILE*     4.0    10.1    -      -       +      +
----------------------------------------------------------
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Residues in contact with VAL 42 (chain 3). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     383  MET      3.1     8.1    +      -       -      +
     393  MET*     3.0     8.6    +      -       -      +
     413  THR*     1.3    79.1    -      -       -      +
     433  ARG*     1.3    62.3    +      -       -      +
     453  MET*     3.5     7.7    +      -       -      +
     463  GLU*     3.0    25.2    +      -       +      +
     653  CYS*     4.1    14.4    -      -       -      -
     693  GLU*     3.7    20.0    -      -       +      -
     723  CYS*     4.3     9.9    -      -       -      -
     733  VAL*     5.9     0.7    -      -       +      -
     923  HIS      5.4     0.4    -      -       -      -
     933  GLY*     3.8    32.8    -      -       -      +
     963  PHE*     3.6    29.2    -      -       +      -
     973  THR*     4.7     4.0    -      -       +      -
----------------------------------------------------------
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Residues in contact with ARG 43 (chain 3). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     393  MET      2.8    15.2    +      -       -      +
     403  GLN*     3.7    15.6    -      -       -      +
     423  VAL*     1.3    75.3    -      -       -      +
     443  ARG*     1.3    69.0    +      -       -      +
     463  GLU*     3.2     4.6    +      -       -      +
     473  LEU*     3.1    44.2    +      -       +      +
     663  ASP*     3.6    14.2    +      -       -      +
     673  GLY*     3.5    10.7    -      -       -      +
     693  GLU*     2.8    42.7    +      -       -      +
    2603  TYR*     3.7    11.2    -      -       -      -
    2823  ARG*     5.1     4.9    -      -       -      +
    2863  ASP*     3.1    32.3    +      -       -      -
    2873  PRO*     4.3     1.6    -      -       -      +
    2883  ILE*     3.7    20.6    -      -       +      +
----------------------------------------------------------
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Residues in contact with ARG 44 (chain 3). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     403  GLN*     2.9    38.4    +      -       -      +
     433  ARG*     1.3    83.1    -      -       -      +
     453  MET*     1.3    58.5    +      -       -      +
     473  LEU*     3.3    34.0    +      -       -      +
     483  LYS*     2.9    30.0    +      -       -      +
    3103  ASP      5.5     0.4    -      -       -      +
    3133  VAL*     3.4    17.5    -      -       +      +
    3143  ARG*     3.0    55.5    -      -       -      +
    3173  ILE*     3.5    24.9    -      -       +      +
----------------------------------------------------------
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Residues in contact with MET 45 (chain 3). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     413  THR      3.1    20.2    +      -       -      +
     423  VAL*     3.6     7.9    -      -       -      +
     433  ARG      3.1     0.2    -      -       -      -
     443  ARG*     1.3    77.7    -      -       -      +
     463  GLU*     1.3    68.2    +      -       -      +
     483  LYS*     3.3     1.8    +      -       -      +
     493  ALA*     2.8    31.7    +      -       -      +
     923  HIS*     4.5    10.1    -      -       -      +
     963  PHE*     4.3    11.9    -      -       +      -
    1023  VAL*     3.3    47.8    -      -       +      -
    1053  ILE*     3.4    45.5    -      -       +      -
    1063  LEU*     4.3    13.3    -      -       +      +
    1093  LEU*     6.1     0.7    -      -       -      -
    3173  ILE*     4.2    12.5    -      -       +      +
----------------------------------------------------------
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Residues in contact with GLU 46 (chain 3). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     423  VAL*     3.0    23.7    +      -       +      +
     433  ARG      3.2     3.8    +      -       -      +
     453  MET*     1.3    84.5    -      -       -      +
     473  LEU*     1.3    51.5    +      -       -      +
     493  ALA*     3.5     3.7    +      -       -      +
     503  ASP*     2.7    34.3    +      -       -      +
     633  HIS      4.1     0.2    -      -       -      +
     643  LEU*     3.4    19.2    -      -       +      +
     653  CYS*     2.9    45.7    +      -       -      +
     663  ASP*     3.9    26.2    -      -       +      +
     903  ARG      6.0     0.2    -      -       -      -
     923  HIS*     3.0    40.7    +      -       -      +
     933  GLY      4.9     0.2    -      -       -      -
    1093  LEU*     5.6     0.2    -      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 47 (chain 3). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     433  ARG*     3.1    37.6    +      -       +      +
     443  ARG*     3.3    42.6    -      -       -      +
     453  MET      3.3     0.2    -      -       -      -
     463  GLU*     1.3    72.8    -      -       -      +
     483  LYS*     1.3    59.7    +      -       -      +
     503  ASP*     3.1    14.3    +      -       +      +
     513  GLN*     2.9    30.0    +      -       -      +
     663  ASP*     5.0    11.9    -      -       -      +
    2823  ARG*     6.3     1.6    -      -       -      +
----------------------------------------------------------
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Residues in contact with LYS 48 (chain 3). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     443  ARG      2.9    18.4    +      -       -      +
     453  MET*     3.8     3.4    -      -       -      +
     473  LEU*     1.3    72.7    -      -       -      +
     493  ALA*     1.3    67.2    +      -       -      +
     513  GLN*     3.2    33.8    +      -       -      +
     523  LEU*     2.9    33.7    +      -       +      +
    1063  LEU*     3.9    13.9    -      -       +      -
    3173  ILE*     3.6    13.7    -      -       +      -
    3183  GLU*     2.8    32.8    +      -       -      -
    3213  ALA*     3.4    31.3    -      -       +      +
----------------------------------------------------------
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Residues in contact with ALA 49 (chain 3). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     453  MET*     2.8    18.0    +      -       +      +
     463  GLU*     3.8     7.2    -      -       -      +
     483  LYS*     1.3    77.9    -      -       -      +
     503  ASP*     1.3    63.6    +      -       -      +
     523  LEU*     3.2     2.7    +      -       -      -
     533  TYR*     3.1    24.3    +      -       -      +
     583  ILE*     3.6    13.6    -      -       +      +
     623  CYS*     4.6     4.0    -      -       -      -
     643  LEU*     4.4    11.9    -      -       +      -
    1063  LEU*     4.0    17.2    -      -       +      +
    1093  LEU*     4.1    17.7    -      -       +      -
----------------------------------------------------------
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Residues in contact with ASP 50 (chain 3). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     463  GLU      2.7    22.1    +      -       -      +
     473  LEU*     3.1    17.1    +      -       +      +
     493  ALA*     1.3    74.9    -      -       -      +
     513  GLN*     1.3    61.9    +      -       -      +
     533  TYR*     3.4    10.2    +      -       -      +
     543  LYS*     2.9    52.9    +      -       -      +
     623  CYS*     5.4     0.4    -      -       -      -
     643  LEU*     3.6    24.0    -      -       +      +
     663  ASP*     5.8     0.4    -      -       -      +
----------------------------------------------------------
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Residues in contact with GLN 51 (chain 3). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     473  LEU      2.9    15.8    +      -       -      +
     483  LYS*     3.3    35.0    +      -       -      +
     503  ASP*     1.3    74.9    -      -       -      +
     523  LEU*     1.3    62.5    +      -       -      +
     533  TYR      2.8    10.4    +      -       -      -
     543  LYS*     3.4     8.2    +      -       -      +
     553  GLN*     3.0    45.5    +      -       +      +
----------------------------------------------------------
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Residues in contact with LEU 52 (chain 3). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     483  LYS*     2.9    42.4    +      -       +      +
     493  ALA*     3.6     9.0    -      -       -      +
     513  GLN*     1.3    76.7    -      -       -      +
     533  TYR*     1.3    58.0    +      -       -      +
     553  GLN*     3.7    13.5    -      -       -      +
     563  LYS      3.4     2.6    +      -       -      -
     573  ILE*     3.1    43.8    +      -       +      +
     583  ILE*     3.6    14.5    +      -       +      -
    1063  LEU*     4.6    11.9    -      -       +      -
    1093  LEU*     6.5     0.2    -      -       +      -
    1103  THR*     4.3    15.9    -      -       +      -
    3213  ALA*     4.5    10.5    -      -       +      -
    3243  ALA*     5.4     0.4    -      -       +      -
    3253  THR*     3.7    27.8    -      -       +      -
----------------------------------------------------------
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Residues in contact with TYR 53 (chain 3). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     493  ALA      3.1    15.2    +      -       -      +
     503  ASP*     3.8    11.0    -      -       -      +
     513  GLN      2.9     1.0    -      -       -      -
     523  LEU*     1.3    79.2    -      -       -      +
     543  LYS*     1.3    72.7    +      -       +      +
     553  GLN      3.0     0.7    -      -       -      -
     563  LYS*     3.1    14.3    +      -       -      +
     583  ILE*     3.3    39.5    -      -       +      +
     593  ARG      4.8     0.7    -      -       -      -
     603  GLY      3.5    23.4    +      -       -      -
     613  PHE*     4.4     1.1    -      -       -      -
     623  CYS*     3.4    41.4    +      -       +      -
     643  LEU*     6.2     1.1    -      -       +      -
----------------------------------------------------------
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Residues in contact with LYS 54 (chain 3). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     503  ASP*     2.9    51.5    +      -       -      +
     513  GLN*     3.4     7.6    +      -       -      +
     533  TYR*     1.3    81.0    -      -       +      +
     553  GLN*     1.3    59.2    +      -       +      +
     563  LYS*     3.5    10.7    +      -       -      +
----------------------------------------------------------
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Residues in contact with GLN 55 (chain 3). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     513  GLN*     3.0    50.8    +      -       +      +
     523  LEU*     3.7    13.6    -      -       -      +
     533  TYR      3.0     1.2    -      -       -      -
     543  LYS*     1.3    77.9    -      -       +      +
     563  LYS*     1.3    70.9    +      -       -      +
     573  ILE*     3.3    22.4    +      -       +      +
----------------------------------------------------------
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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