Contacts of the helix formed by residues 47 - 74 (chain P) in PDB entry 6CP3


Residue contacts within the protein are derived with the CSU software (Sobolev V., Sorokine A., Prilusky J., Abola E.E. and Edelman M. (1999) Automated analysis of interatomic contacts in proteins. Bioinformatics, 15, 327-332). A short description of the analytical approach is given at the end of the page.
For CSU analysis of other PDB entry

Note:
Non-standard 3 letter residue codes indicate a heterogroup. To identify and analyse, use LPC software

Legend:
Dist - nearest distance (Å) between atoms of two residues
Surf - contact surface area (Å2) between two residues
HB   - hydrophilic-hydrophilic contact (hydrogen bond)
Arom - aromatic-aromatic contact
Phob - hydrophobic-hydrophobic contact
DC   - hydrophobic-hydrophilic contact (destabilizing contact)
+/-  - indicates presence/absence of a specific contacts
*    - indicates residues forming contacts  by their side chain
       (including CA atoms)
Residues in contact with VAL 47 (chain P).
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     33P  LEU*     3.9    17.7    -      -       +      +
     43P  ILE*     3.9    22.4    -      -       +      +
     44P  LYS      3.3    18.8    -      -       -      +
     46P  THR*     1.3    77.4    -      -       -      +
     48P  PHE*     1.3    58.7    +      -       -      +
     49P  PRO*     3.3     2.0    -      -       -      -
     50P  MET*     3.1    19.6    +      -       +      +
     51P  ALA*     3.0    23.1    +      -       -      +
     34Q  ILE*     5.1    12.1    -      -       +      +
     37Q  VAL*     4.1    23.8    -      -       +      -
     44Q  LYS*     3.4    25.6    -      -       -      +
----------------------------------------------------------
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Residues in contact with PHE 48 (chain P). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     50O  MET*     3.8    33.4    -      -       +      -
     53O  LEU*     5.3    11.2    -      -       +      -
     30P  PHE*     3.6    25.6    -      +       -      -
     33P  LEU*     4.0    10.8    -      -       +      -
     44P  LYS      3.7     3.3    +      -       -      +
     45P  ASP*     3.3    32.1    -      -       +      +
     47P  VAL*     1.3    78.0    -      -       -      +
     49P  PRO*     1.4    64.6    -      -       +      +
     51P  ALA*     3.9     4.5    -      -       -      -
     52P  ILE*     2.9    58.2    +      -       +      +
----------------------------------------------------------
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Residues in contact with PRO 49 (chain P). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     45P  ASP      3.3    18.6    -      -       -      +
     46P  THR*     3.7    11.0    -      -       -      +
     47P  VAL      3.6     3.4    -      -       -      -
     48P  PHE*     1.4    90.6    -      -       +      +
     50P  MET*     1.3    58.5    +      -       +      +
     52P  ILE*     3.4    11.2    -      -       +      +
     53P  LEU*     2.9    31.0    +      -       -      +
----------------------------------------------------------
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Residues in contact with MET 50 (chain P). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     46P  THR      4.6     1.8    -      -       -      +
     47P  VAL*     3.1    21.0    +      -       +      +
     49P  PRO*     1.3    79.6    -      -       +      +
     51P  ALA*     1.3    58.0    +      -       -      +
     53P  LEU*     3.4     7.3    -      -       -      +
     54P  GLY      3.0    24.4    +      -       -      -
     30Q  PHE*     3.7    19.8    -      -       +      -
     33Q  LEU*     3.7    27.4    -      -       +      -
     34Q  ILE*     5.6     7.6    -      -       +      -
     37Q  VAL*     4.9    11.9    -      -       +      -
     44Q  LYS*     3.6    34.1    -      -       +      +
     45Q  ASP*     5.6     0.4    -      -       -      +
     48Q  PHE*     3.7    46.0    -      -       +      -
----------------------------------------------------------
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Residues in contact with ALA 51 (chain P). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     29P  VAL*     4.2    15.3    -      -       +      +
     30P  PHE*     3.6    27.6    -      -       +      -
     33P  LEU*     4.0    13.5    -      -       +      -
     47P  VAL      3.0    11.9    +      -       -      +
     48P  PHE*     3.2    13.0    +      -       -      +
     50P  MET*     1.3    77.0    -      -       -      +
     52P  ILE*     1.3    57.0    +      -       -      +
     54P  GLY*     3.4     2.3    +      -       -      -
     55P  PHE*     2.9    26.9    +      -       -      +
     34Q  ILE*     4.4    13.6    -      -       +      +
----------------------------------------------------------
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Residues in contact with ILE 52 (chain P). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     30P  PHE*     4.1     4.0    -      -       +      -
     48P  PHE*     2.9    51.8    +      -       +      +
     49P  PRO*     3.4    13.2    -      -       +      +
     51P  ALA*     1.3    69.2    -      -       -      +
     53P  LEU*     1.3    62.7    +      -       -      +
     55P  PHE*     3.8    18.8    -      -       +      -
     56P  ALA*     2.9    32.3    +      -       +      +
----------------------------------------------------------
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Residues in contact with LEU 53 (chain P). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     49P  PRO      2.9    20.4    +      -       -      +
     50P  MET*     3.4     9.2    -      -       -      +
     51P  ALA      3.2     0.2    -      -       -      -
     52P  ILE*     1.3    74.7    -      -       -      +
     54P  GLY*     1.3    64.1    +      -       -      +
     56P  ALA*     3.3     2.7    +      -       +      -
     57P  LEU*     3.1    58.7    +      -       +      +
     30Q  PHE*     3.9    21.5    -      -       +      -
     48Q  PHE*     5.7     9.0    -      -       +      -
     52Q  ILE*     4.8    17.7    -      -       +      -
     55Q  PHE*     5.1     2.2    -      -       +      -
----------------------------------------------------------
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Residues in contact with GLY 54 (chain P). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     29P  VAL*     5.2     7.6    -      -       -      -
     50P  MET      3.0    13.1    +      -       -      -
     51P  ALA      3.8     2.7    -      -       -      -
     53P  LEU*     1.3    75.7    -      -       -      +
     55P  PHE*     1.3    51.3    +      -       -      +
     57P  LEU*     5.1     1.1    -      -       -      -
     58P  SER*     2.3    45.3    +      -       -      -
     30Q  PHE*     3.6    34.5    -      -       -      -
----------------------------------------------------------
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Residues in contact with PHE 55 (chain P). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     54O  GLY*     6.4     0.7    -      -       -      -
     57O  LEU*     3.4    53.2    -      -       +      -
     58O  SER*     4.5     3.4    -      -       -      -
     61O  THR*     5.9     0.4    -      -       +      -
     26P  ILE*     3.4    53.9    -      -       +      +
     29P  VAL*     5.3     1.5    -      -       -      +
     30P  PHE*     3.5    22.9    -      +       +      -
     51P  ALA      2.9    14.8    +      -       -      +
     52P  ILE*     3.4    19.3    -      -       +      +
     54P  GLY*     1.3    75.8    -      -       -      +
     56P  ALA*     1.3    63.5    +      -       +      +
     58P  SER*     3.8     2.3    -      -       -      -
     59P  GLU*     2.9    44.6    +      -       +      +
----------------------------------------------------------
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Residues in contact with ALA 56 (chain P). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     52P  ILE*     2.9    21.6    +      -       +      +
     53P  LEU*     3.3     3.8    +      -       -      +
     55P  PHE*     1.3    80.9    -      -       +      +
     57P  LEU*     1.3    63.3    +      -       +      +
     59P  GLU*     3.3    15.4    +      -       -      +
     60P  ALA*     3.0    26.7    +      -       -      +
     63P  LEU*     5.3     0.3    -      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 57 (chain P). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     53P  LEU*     3.1    52.9    +      -       +      +
     54P  GLY      3.7     3.1    -      -       -      -
     56P  ALA*     1.3    81.4    -      -       +      +
     58P  SER*     1.3    55.7    +      -       -      +
     60P  ALA*     3.9    16.2    -      -       +      -
     61P  THR*     5.0     2.9    -      -       -      +
     26Q  ILE*     3.4    15.8    -      -       -      +
     55Q  PHE*     3.5    38.1    -      -       +      -
     59Q  GLU*     5.4     2.3    -      -       -      +
----------------------------------------------------------
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Residues in contact with SER 58 (chain P). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     22P  ALA*     4.1     4.4    -      -       -      +
     25P  GLY      5.3     1.6    -      -       -      -
     26P  ILE*     3.7    20.4    -      -       -      -
     29P  VAL*     5.4     1.3    -      -       -      +
     54P  GLY*     2.3    30.4    +      -       -      -
     57P  LEU*     1.3    76.7    -      -       -      +
     59P  GLU*     1.3    58.6    +      -       -      +
     60P  ALA      3.1     1.8    -      -       -      -
     61P  THR*     2.6    33.1    +      -       -      +
     23Q  GLY*     4.9     8.2    -      -       -      -
     26Q  ILE*     3.3    30.3    -      -       -      +
     27Q  ALA*     4.7     5.8    +      -       -      -
     30Q  PHE*     4.9     1.0    -      -       -      -
----------------------------------------------------------
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Residues in contact with GLU 59 (chain P). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     61O  THR*     4.7    12.4    -      -       +      +
     64O  PHE*     5.7     1.9    -      -       -      -
     22P  ALA*     4.2     8.5    -      -       +      -
     26P  ILE*     3.5    27.1    -      -       +      +
     55P  PHE*     2.9    35.3    +      -       +      +
     56P  ALA*     3.4    14.5    -      -       -      +
     58P  SER*     1.3    72.5    -      -       -      +
     60P  ALA*     1.3    59.2    +      -       -      +
     61P  THR      3.1     1.6    -      -       -      -
     62P  GLY*     3.1     4.1    +      -       -      -
     63P  LEU*     2.9    55.8    +      -       -      +
----------------------------------------------------------
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Residues in contact with ALA 60 (chain P). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     56P  ALA      3.0    16.5    +      -       -      +
     57P  LEU*     3.9    16.2    -      -       +      -
     58P  SER      3.1     0.4    -      -       -      -
     59P  GLU*     1.3    76.5    -      -       -      +
     61P  THR*     1.3    57.0    +      -       +      +
     63P  LEU*     3.3    18.6    -      -       +      +
     64P  PHE*     2.9    46.1    +      -       +      -
----------------------------------------------------------
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Residues in contact with THR 61 (chain P). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     22P  ALA*     3.8    10.9    +      -       -      +
     57P  LEU      5.0     2.2    -      -       -      +
     58P  SER*     2.6    28.0    +      -       -      +
     60P  ALA*     1.3    77.8    -      -       +      +
     62P  GLY*     1.3    62.7    +      -       -      +
     64P  PHE*     3.2    13.7    +      -       +      +
     65P  CYS      2.9    22.2    +      -       -      -
     19Q  LEU*     3.3    33.5    +      -       +      +
     23Q  GLY*     4.5    13.3    -      -       -      +
     26Q  ILE*     4.8     0.7    -      -       +      -
     59Q  GLU*     3.3    32.8    -      -       -      +
----------------------------------------------------------
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Residues in contact with GLY 62 (chain P). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     19P  LEU*     3.8    29.1    -      -       -      +
     22P  ALA*     4.0     7.9    -      -       -      +
     59P  GLU      3.1     7.5    +      -       -      -
     61P  THR*     1.3    80.8    +      -       -      +
     63P  LEU*     1.3    60.2    +      -       -      +
     65P  CYS*     3.4     4.9    -      -       -      +
     66P  LEU*     3.0    33.9    +      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 63 (chain P). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     64O  PHE*     5.6     9.9    -      -       +      -
     56P  ALA      5.3     0.2    -      -       -      +
     59P  GLU*     2.9    45.5    +      -       -      +
     60P  ALA*     3.3    22.4    -      -       +      +
     62P  GLY*     1.3    75.8    -      -       -      +
     64P  PHE*     1.3    61.9    +      -       +      +
     66P  LEU*     3.5    16.1    -      -       +      +
     67P  MET*     3.0    32.5    +      -       -      +
----------------------------------------------------------
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Residues in contact with PHE 64 (chain P). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     60P  ALA*     2.9    30.8    +      -       +      -
     61P  THR*     3.4    12.6    -      -       +      +
     63P  LEU*     1.3    78.5    -      -       +      +
     65P  CYS*     1.3    57.1    +      -       -      +
     67P  MET*     3.4    19.9    -      -       +      +
     68P  VAL*     2.9    37.2    +      -       -      +
     19Q  LEU*     4.8     4.7    -      -       +      -
     63Q  LEU*     4.8    16.4    -      -       +      -
     66Q  LEU*     3.8    33.2    -      -       +      -
----------------------------------------------------------
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Residues in contact with CYS 65 (chain P). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     15P  SER*     3.2    28.9    -      -       -      +
     16P  THR*     3.5    21.1    -      -       -      -
     18P  GLY*     3.6    11.4    -      -       -      -
     19P  LEU*     3.6    15.0    -      -       +      +
     61P  THR      2.9    13.4    +      -       -      +
     62P  GLY*     3.4    14.6    -      -       -      +
     63P  LEU      3.2     0.2    -      -       -      -
     64P  PHE*     1.3    77.7    -      -       -      +
     66P  LEU*     1.3    59.3    +      -       -      +
     68P  VAL*     3.3     6.8    +      -       -      +
     69P  SER      3.0    20.8    +      -       -      -
     16Q  THR*     4.7     6.5    -      -       -      -
     17Q  ILE*     5.4     0.2    -      -       -      -
     19Q  LEU*     3.8    17.7    -      -       +      +
----------------------------------------------------------
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Residues in contact with LEU 66 (chain P). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     64O  PHE*     4.7    18.2    -      -       +      -
     67O  MET*     3.9    28.3    -      -       +      -
     68O  VAL*     4.2    13.2    -      -       +      -
     15P  SER      4.6     1.1    -      -       -      -
     16P  THR*     6.0     1.6    -      -       +      +
     19P  LEU*     4.7    12.8    -      -       +      -
     62P  GLY      3.0    29.3    +      -       -      +
     63P  LEU*     3.5    28.5    -      -       +      +
     65P  CYS*     1.3    77.4    -      -       -      +
     67P  MET*     1.3    58.9    +      -       +      +
     69P  SER*     3.3    11.9    +      -       -      -
     70P  PHE*     2.8    50.7    +      -       +      -
----------------------------------------------------------
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Residues in contact with MET 67 (chain P). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     63P  LEU      3.0    22.3    +      -       -      +
     64P  PHE*     3.4    40.6    -      -       +      +
     66P  LEU*     1.3    76.1    -      -       +      +
     68P  VAL*     1.3    66.8    +      -       +      +
     70P  PHE*     3.4    16.6    -      -       +      +
     71P  LEU*     2.9    45.9    +      -       -      +
     66Q  LEU*     4.2     3.8    -      -       +      -
     70Q  PHE*     3.6    28.5    -      -       +      -
----------------------------------------------------------
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Residues in contact with VAL 68 (chain P). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     15P  SER*     4.2     7.0    -      -       -      -
     64P  PHE      2.9    22.0    +      -       -      +
     65P  CYS      3.5     4.9    -      -       -      +
     67P  MET*     1.3    90.5    -      -       +      +
     69P  SER*     1.3    57.3    +      -       -      +
     71P  LEU*     3.7    10.2    -      -       +      +
     72P  LEU*     2.9    35.3    +      -       +      +
     12Q  ALA*     4.7     4.5    -      -       +      +
     16Q  THR*     3.8    32.1    -      -       +      +
     66Q  LEU*     4.8     9.0    -      -       +      -
     69Q  SER*     4.2    10.5    -      -       -      +
     70Q  PHE*     3.9    19.3    -      -       +      -
----------------------------------------------------------
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Residues in contact with SER 69 (chain P). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     68O  VAL*     4.3    10.4    -      -       -      +
     12P  ALA*     3.0    26.6    +      -       -      +
     15P  SER*     3.3    29.7    +      -       -      -
     16P  THR*     4.3     7.1    -      -       -      +
     65P  CYS      3.0     7.7    +      -       -      -
     66P  LEU*     3.3    15.5    -      -       -      -
     67P  MET      3.2     0.2    -      -       -      -
     68P  VAL*     1.3    77.0    -      -       -      +
     70P  PHE*     1.3    52.2    +      -       -      +
     73P  LEU*     2.7    42.5    +      -       -      +
----------------------------------------------------------
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Residues in contact with PHE 70 (chain P). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     67O  MET*     5.0     6.7    -      -       +      -
     68O  VAL*     5.0     6.3    -      -       +      -
     71O  LEU*     4.7    21.8    -      -       +      -
     66P  LEU*     2.8    44.0    +      -       +      -
     67P  MET*     3.4    18.8    -      -       +      +
     68P  VAL      3.2     0.2    -      -       -      -
     69P  SER*     1.3    79.5    -      -       -      +
     71P  LEU*     1.3    57.9    +      -       -      +
     73P  LEU*     2.9    27.6    +      -       +      +
     74P  PHE*     3.0    26.4    +      +       +      +
----------------------------------------------------------
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Residues in contact with LEU 71 (chain P). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
      8P  LYS*     5.2     3.5    +      -       -      -
     67P  MET*     2.9    45.4    +      -       -      +
     68P  VAL*     3.7    13.7    -      -       +      +
     70P  PHE*     1.3    72.7    -      -       -      +
     72P  LEU*     1.3    65.5    +      -       +      +
     74P  PHE      4.5     9.4    -      -       -      -
     70Q  PHE*     4.0    24.0    -      -       +      -
     73Q  LEU*     4.1    26.7    -      -       +      +
----------------------------------------------------------
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Residues in contact with LEU 72 (chain P). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
      8P  LYS*     3.3    39.7    -      -       +      +
     11P  GLY*     3.6    31.4    -      -       -      +
     12P  ALA*     3.8     2.2    -      -       -      +
     15P  SER*     5.0     2.2    -      -       -      +
     68P  VAL*     2.9    22.1    +      -       +      +
     69P  SER      4.4     1.3    -      -       -      +
     71P  LEU*     1.3    80.4    -      -       +      +
     73P  LEU*     1.3    64.2    +      -       -      +
      9Q  TYR*     3.3    56.1    -      -       +      +
     12Q  ALA*     4.8     6.3    -      -       +      -
     13Q  GLY*     4.2     7.9    -      -       -      +
     73Q  LEU*     4.2    14.1    -      -       +      -
----------------------------------------------------------
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Residues in contact with LEU 73 (chain P). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     68O  VAL*     6.1     0.9    -      -       +      -
     71O  LEU*     3.7    28.3    -      -       +      +
     72O  LEU*     3.8    18.4    -      -       +      -
      8P  LYS*     4.4     6.4    +      -       -      +
      9P  TYR*     3.5    48.1    -      -       +      -
     12P  ALA*     3.8    18.4    -      -       +      -
     69P  SER*     2.7    25.7    +      -       -      +
     70P  PHE*     2.9    13.2    +      -       +      +
     72P  LEU*     1.3    80.6    -      -       -      +
     74P  PHE*     1.3    88.3    +      -       +      +
----------------------------------------------------------
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Residues in contact with PHE 74 (chain P). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     71O  LEU*     5.0    10.8    -      -       +      -
      8P  LYS*     4.8    13.2    -      -       -      -
      9P  TYR*     5.7     7.6    -      +       -      -
     70P  PHE*     3.0    19.4    +      +       +      +
     71P  LEU*     4.5    10.5    -      -       -      -
     73P  LEU*     1.3   113.6    -      -       +      +
----------------------------------------------------------
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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