Contacts of the helix formed by residues 27 - 51 (chain D) in PDB entry 1C03


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 PHE 27 (chain D).
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     64B  HIS*     3.8    28.8    -      +       -      -
     67B  LYS*     3.9    17.7    -      -       +      -
     68B  GLY*     4.1    20.9    -      -       -      -
     71B  ALA*     4.7     2.7    -      -       +      -
     17D  ILE*     3.7    32.1    -      -       +      -
     20D  MET*     3.5    39.5    -      -       +      +
     21D  ASP*     3.2     9.4    +      -       -      +
     24D  ASP*     3.2    30.0    +      -       +      +
     25D  SER      3.3     4.0    +      -       -      -
     26D  ASP*     1.3    74.4    -      -       -      +
     28D  SER*     1.3    66.5    +      -       -      +
     29D  LYS      4.3     0.2    -      -       -      +
     30D  GLY*     2.7    20.6    +      -       -      -
     31D  LEU*     3.0    29.2    +      -       +      +
----------------------------------------------------------
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Residues in contact with SER 28 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     14D  LEU*     5.6     2.2    -      -       -      -
     17D  ILE*     4.2    23.3    -      -       -      -
     18D  ILE*     4.3     8.7    -      -       -      +
     21D  ASP*     2.7    36.9    +      -       -      -
     27D  PHE*     1.3    75.6    -      -       -      +
     29D  LYS*     1.3    65.4    +      -       -      +
     30D  GLY      3.1     0.5    +      -       -      -
     31D  LEU*     3.2     6.4    +      -       -      +
     32D  ILE*     3.0    26.0    +      -       -      +
     73D  LEU*     5.6     0.2    -      -       -      +
    163D  TYR*     2.8    28.7    +      -       -      -
----------------------------------------------------------
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Residues in contact with LYS 29 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     21D  ASP*     5.3     0.2    -      -       -      -
     25D  SER      5.7     0.7    -      -       -      +
     26D  ASP*     3.8    28.9    +      -       +      +
     27D  PHE      4.3     0.6    -      -       -      +
     28D  SER*     1.3    82.0    +      -       -      +
     30D  GLY*     1.3    58.7    +      -       -      +
     32D  ILE*     3.7     5.9    +      -       +      +
     33D  ILE*     3.1    53.0    +      -       +      +
    163D  TYR*     3.6    37.0    +      -       +      +
    165D  THR*     3.5    31.0    -      -       -      +
    167D  LEU*     5.1     5.6    -      -       +      -
----------------------------------------------------------
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Residues in contact with GLY 30 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     64B  HIS*     5.4     9.6    -      -       -      -
     26D  ASP      3.2    14.1    +      -       -      -
     27D  PHE      2.7    10.4    +      -       -      -
     29D  LYS*     1.3    78.0    -      -       -      +
     31D  LEU*     1.3    58.5    +      -       -      -
     33D  ILE*     3.5     7.3    +      -       -      +
     34D  GLN*     3.0    28.0    +      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 31 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     64B  HIS*     5.0     8.5    -      -       +      +
     68B  GLY*     4.3    24.2    -      -       -      +
     17D  ILE*     3.8    33.0    -      -       +      -
     27D  PHE*     3.0    34.5    +      -       +      +
     28D  SER      3.5     6.3    -      -       -      +
     30D  GLY*     1.3    73.9    -      -       -      +
     32D  ILE*     1.3    54.8    +      -       -      +
     34D  GLN*     2.9    25.0    +      -       -      +
     35D  PHE*     2.8    34.1    +      -       -      +
     73D  LEU*     4.0    24.1    -      -       +      +
----------------------------------------------------------
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Residues in contact with ILE 32 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     14D  LEU*     5.2     8.1    -      -       +      -
     28D  SER*     3.0    13.0    +      -       -      +
     29D  LYS*     3.8     6.5    -      -       -      +
     31D  LEU*     1.3    74.2    -      -       -      +
     33D  ILE*     1.3    58.7    +      -       -      +
     35D  PHE*     3.2     4.9    +      -       +      +
     36D  ILE*     3.0    43.3    +      -       +      +
     73D  LEU*     4.1    21.8    -      -       +      -
    159D  LEU*     4.0    33.9    -      -       +      -
    163D  TYR*     3.5    46.2    -      -       +      +
    167D  LEU*     4.1    19.1    -      -       +      -
----------------------------------------------------------
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Residues in contact with ILE 33 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     29D  LYS*     3.1    49.8    +      -       +      +
     30D  GLY*     3.9     7.0    -      -       -      +
     32D  ILE*     1.3    75.8    -      -       -      +
     34D  GLN*     1.3    67.1    +      -       -      +
     36D  ILE*     3.7    11.8    +      -       +      +
     37D  ASP*     3.6    17.2    +      -       -      +
    167D  LEU*     4.5    17.3    -      -       +      -
----------------------------------------------------------
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Residues in contact with GLN 34 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     64B  HIS*     5.0    12.1    +      -       -      -
     65B  PHE*     5.6     9.8    -      -       -      +
     30D  GLY      3.0    13.2    +      -       -      +
     31D  LEU*     2.9    27.8    +      -       -      +
     33D  ILE*     1.3    77.4    -      -       -      +
     35D  PHE*     1.3    62.2    +      -       -      +
     37D  ASP*     3.2     8.5    +      -       -      +
     38D  GLN*     3.1    41.1    +      -       -      +
----------------------------------------------------------
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Residues in contact with PHE 35 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     31D  LEU      2.8     6.0    +      -       -      +
     32D  ILE*     3.4    11.2    -      -       +      +
     34D  GLN*     1.3    77.4    -      -       -      +
     36D  ILE*     1.3    56.3    +      -       +      +
     38D  GLN*     3.2    10.7    +      -       -      +
     39D  ALA*     2.8    44.7    +      -       +      +
     66D  LEU*     3.5    27.4    -      -       +      -
     69D  SER*     3.8    19.5    -      -       -      -
     70D  SER*     4.0    23.1    -      -       -      -
     73D  LEU*     3.5    23.1    -      -       +      -
     75D  LEU*     3.4    27.1    -      -       +      -
     78D  ILE*     4.1    17.0    -      -       +      -
    152D  PHE*     3.8    22.4    -      +       -      -
    155D  ALA*     5.7     0.2    -      -       +      -
----------------------------------------------------------
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Residues in contact with ILE 36 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     32D  ILE*     3.0    38.5    +      -       +      +
     33D  ILE*     3.9    12.3    -      -       +      +
     34D  GLN      3.3     0.4    -      -       -      -
     35D  PHE*     1.3    79.8    -      -       +      +
     37D  ASP*     1.3    60.6    +      -       -      +
     40D  GLN*     3.4    41.6    +      -       -      +
    152D  PHE*     3.5    18.0    -      -       +      -
    156D  ARG*     3.5    27.8    -      -       +      +
    159D  LEU*     6.2     0.4    -      -       +      -
    167D  LEU*     3.5    32.8    -      -       +      +
----------------------------------------------------------
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Residues in contact with ASP 37 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     45A  GLN*     4.1    16.0    +      -       -      -
     48A  ARG*     4.5    11.3    +      -       -      -
     33D  ILE      3.6     8.8    +      -       -      +
     34D  GLN*     3.2     9.7    +      -       -      +
     35D  PHE      3.1     1.0    -      -       -      -
     36D  ILE*     1.3    78.8    -      -       -      +
     38D  GLN*     1.3    64.0    +      -       +      +
     40D  GLN*     3.5    12.6    +      -       -      +
     41D  THR*     2.9    36.5    +      -       -      -
----------------------------------------------------------
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Residues in contact with GLN 38 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     34D  GLN*     3.1    35.4    +      -       +      +
     35D  PHE*     3.7    13.9    -      -       +      +
     37D  ASP*     1.3    75.1    -      -       -      +
     39D  ALA*     1.3    59.5    +      -       -      +
     41D  THR*     2.8    22.7    +      -       -      -
     42D  THR*     2.9    19.5    +      -       -      +
     65D  PHE*     3.4    35.3    -      -       +      -
     66D  LEU*     5.7     0.7    -      -       +      -
     69D  SER*     3.5    20.0    +      -       -      -
----------------------------------------------------------
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Residues in contact with ALA 39 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     35D  PHE*     2.8    35.7    +      -       +      +
     38D  GLN*     1.3    71.6    -      -       -      +
     40D  GLN*     1.3    63.9    +      -       -      +
     41D  THR      3.1     0.2    +      -       -      -
     42D  THR*     3.2     2.0    +      -       -      -
     43D  PHE*     3.0    35.8    +      -       +      -
     66D  LEU*     4.0    16.5    -      -       +      +
    152D  PHE*     3.5    30.5    -      -       +      -
----------------------------------------------------------
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Residues in contact with GLN 40 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     48A  ARG*     3.2    47.1    +      -       -      +
     36D  ILE*     3.4    31.4    +      -       -      +
     37D  ASP*     3.8    13.6    +      -       -      +
     38D  GLN      3.3     0.4    -      -       -      -
     39D  ALA*     1.3    78.9    -      -       -      +
     41D  THR*     1.3    62.4    +      -       -      +
     43D  PHE*     3.9     9.3    +      -       +      +
     44D  ALA*     3.4    14.9    +      -       -      +
    152D  PHE*     3.7    10.7    -      -       +      -
    156D  ARG*     3.2    26.2    +      -       -      +
----------------------------------------------------------
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Residues in contact with THR 41 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     41A  THR*     4.2    25.6    -      -       +      -
     45A  GLN*     4.8     5.9    +      -       +      -
     48A  ARG*     3.3    21.9    +      -       -      +
     37D  ASP*     2.9    24.1    +      -       -      -
     38D  GLN*     2.8    11.7    +      -       -      -
     40D  GLN*     1.3    78.9    -      -       -      +
     42D  THR*     1.3    59.3    +      -       +      +
     44D  ALA*     3.3     5.4    +      -       +      +
     45D  GLN*     3.1    37.8    +      -       +      +
     48D  ARG*     5.3     0.2    +      -       -      -
----------------------------------------------------------
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Residues in contact with THR 42 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     38D  GLN*     2.9    16.9    +      -       -      +
     39D  ALA*     3.4     2.0    +      -       -      -
     41D  THR*     1.3    75.3    -      -       +      +
     43D  PHE*     1.3    60.1    +      -       -      +
     44D  ALA      3.1     0.2    -      -       -      -
     45D  GLN*     3.0    15.2    +      -       -      +
     46D  MET*     2.7    42.1    +      -       -      +
     62D  LEU*     4.5    15.5    -      -       +      -
     65D  PHE*     3.5    36.3    -      -       +      -
     66D  LEU*     3.0    28.4    -      -       +      +
----------------------------------------------------------
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Residues in contact with PHE 43 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     39D  ALA*     3.0    21.1    +      -       +      +
     40D  GLN*     4.0     8.1    -      -       +      +
     42D  THR*     1.3    81.4    +      -       -      +
     44D  ALA*     1.3    56.5    +      -       -      +
     46D  MET*     3.3     7.4    +      -       -      +
     47D  GLN*     2.9    29.7    +      -       -      +
     66D  LEU*     3.4    29.8    -      -       +      -
     78D  ILE*     5.1     6.7    -      -       +      -
     82D  CYS*     5.6     0.7    -      -       -      -
     85D  ILE*     6.2     0.2    -      -       +      -
    145D  LEU*     3.4    25.1    -      -       +      +
    148D  SER*     3.6    39.0    -      -       -      -
    149D  ARG*     4.2    25.7    +      -       +      +
    152D  PHE*     3.8    36.6    -      +       +      -
----------------------------------------------------------
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Residues in contact with ALA 44 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     44A  ALA*     5.2     1.3    -      -       +      -
     48A  ARG*     4.0    13.0    -      -       -      +
     40D  GLN      3.4    11.2    +      -       -      +
     41D  THR      3.3     9.9    +      -       -      +
     42D  THR      3.1     0.4    -      -       -      -
     43D  PHE*     1.3    80.9    -      -       -      +
     45D  GLN*     1.3    56.4    +      -       -      +
     47D  GLN*     3.7     6.9    -      -       -      +
     48D  ARG*     3.0    51.2    +      -       -      +
    149D  ARG*     5.7     0.4    -      -       -      +
----------------------------------------------------------
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Residues in contact with GLN 45 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     37A  ASP*     4.1    22.8    +      -       -      -
     41A  THR*     4.8     5.5    +      -       -      +
     41D  THR*     3.1    32.0    +      -       +      +
     42D  THR*     3.0    15.7    +      -       -      +
     44D  ALA*     1.3    72.7    -      -       -      +
     46D  MET*     1.3    64.5    +      -       -      +
     48D  ARG*     3.4    23.5    +      -       -      +
     49D  GLN*     3.4    23.6    +      -       -      +
     62D  LEU*     4.0    29.5    -      -       +      +
----------------------------------------------------------
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Residues in contact with MET 46 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     42D  THR*     2.7    22.8    +      -       -      +
     43D  PHE*     3.5    10.8    -      -       +      +
     45D  GLN*     1.3    73.2    -      -       -      +
     47D  GLN*     1.3    60.8    +      -       -      +
     49D  GLN*     3.2     4.5    +      -       -      +
     50D  LEU*     3.1    27.1    +      -       +      +
     59D  LEU*     3.6    18.8    -      -       +      +
     62D  LEU*     3.5    26.2    -      -       +      +
     63D  GLY*     3.5    35.0    -      -       -      +
     66D  LEU*     4.5    15.5    -      -       +      -
     82D  CYS*     5.2     1.6    -      -       -      -
     85D  ILE*     4.3    24.9    -      -       +      -
    141D  ILE*     6.3     1.3    -      -       +      -
    145D  LEU*     3.9    28.5    -      -       +      -
----------------------------------------------------------
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Residues in contact with GLN 47 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     43D  PHE      2.9    17.5    +      -       -      +
     44D  ALA*     3.7     8.5    -      -       -      +
     45D  GLN      3.3     0.2    -      -       -      -
     46D  MET*     1.3    77.8    -      -       -      +
     48D  ARG*     1.3    60.5    +      -       -      +
     50D  LEU*     3.6    10.5    +      -       -      +
     51D  ASP*     3.2    44.3    +      -       -      +
    122D  GLU*     3.3    27.4    -      -       +      +
    123D  GLU      5.3     2.8    -      -       -      +
    142D  ALA*     6.3     0.2    -      -       -      +
    145D  LEU*     3.8     9.9    -      -       +      +
    149D  ARG*     2.6    38.4    -      -       -      +
----------------------------------------------------------
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Residues in contact with ARG 48 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     37A  ASP*     4.6     9.3    +      -       -      -
     40A  GLN*     3.2    53.2    +      -       -      +
     41A  THR*     3.4    30.3    +      -       -      +
     44A  ALA*     4.0    12.3    -      -       -      +
     44D  ALA*     3.0    42.4    +      -       -      +
     45D  GLN*     3.6    23.5    -      -       -      +
     46D  MET      3.2     0.2    -      -       -      -
     47D  GLN*     1.3    76.2    -      -       -      +
     49D  GLN*     1.3    59.8    +      -       -      +
     51D  ASP*     3.9     5.5    -      -       -      +
     52D  GLY*     3.2    21.8    +      -       -      -
     53D  GLU      4.3     0.7    +      -       -      -
----------------------------------------------------------
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Residues in contact with GLN 49 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     45D  GLN      3.4    12.9    +      -       -      +
     46D  MET      3.2     9.3    +      -       -      +
     48D  ARG*     1.3    78.9    -      -       -      +
     50D  LEU*     1.3    66.4    +      -       -      +
     51D  ASP      3.0     1.6    -      -       -      -
     52D  GLY      3.0     5.9    +      -       -      +
     53D  GLU*     3.1    40.7    +      -       -      +
     54D  LYS*     2.8    26.8    +      -       -      +
     55D  ASN*     3.3    31.1    -      -       -      +
     58D  GLU*     3.5    26.8    +      -       +      +
     59D  LEU*     3.9    14.8    -      -       +      -
     62D  LEU*     4.8     4.6    -      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 50 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     46D  MET*     3.1    18.0    +      -       +      +
     47D  GLN*     3.8    20.0    -      -       -      +
     49D  GLN*     1.3    79.0    -      -       -      +
     51D  ASP*     1.3    60.9    +      -       -      +
     54D  LYS*     2.9    31.6    +      -       -      +
     59D  LEU*     3.8    26.9    -      -       +      -
    126D  ILE*     5.1     2.3    -      -       -      +
    138D  LEU*     4.0    25.3    -      -       +      +
    141D  ILE*     4.0    10.8    -      -       +      -
    142D  ALA*     4.0    28.5    -      -       +      -
    145D  LEU*     3.7    25.4    -      -       +      -
----------------------------------------------------------
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Residues in contact with ASP 51 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     47D  GLN*     3.2    41.0    +      -       -      +
     48D  ARG*     4.0     5.1    -      -       -      +
     49D  GLN      3.0     0.6    -      -       -      -
     50D  LEU*     1.3    80.4    -      -       -      +
     52D  GLY*     1.3    59.4    +      -       -      +
     54D  LYS*     4.5     6.7    -      -       -      +
    123D  GLU      5.5     2.6    -      -       -      +
    125D  LYS*     5.7     6.1    +      -       -      +
----------------------------------------------------------
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A short description of the analytical approach
The contact analysis used in this page is based upon the approach developed in: Sobolev V., Wade R.C., Vriend G. and Edelman M. PROTEINS (1996) 25, 120-129. Contact legitimacy depends on the hydrophobic-hydrophilic properties of the contacting atoms. In order to define it, for each inter-atomic contact, eight atom classes have been introduced:


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

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

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