Contacts of the helix formed by residues 86 - 109 (chain D) in PDB entry 2POZ


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 GLY 86 (chain D).
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     84D  ASN      4.0     0.4    +      -       -      -
     85D  GLY*     1.3    72.1    -      -       -      -
     87D  ALA*     1.3    65.6    +      -       -      -
     88D  ILE      3.3     3.5    +      -       -      -
     89D  ILE*     3.3     8.7    -      -       -      +
     90D  PHE*     3.2    26.2    +      -       -      +
    260D  TYR*     4.1    12.1    -      -       -      -
     84E  ASN      5.3     0.7    -      -       -      -
     85E  GLY      4.9     0.2    -      -       -      -
     86E  GLY*     3.9    27.9    -      -       -      -
     87E  ALA*     4.8     2.6    -      -       -      +
----------------------------------------------------------
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Residues in contact with ALA 87 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     39D  ILE*     3.9     5.3    -      -       +      +
     86D  GLY*     1.3    71.8    -      -       -      -
     88D  ILE*     1.3    60.2    +      -       +      +
     91D  ALA*     2.9    33.3    +      -       -      +
    260D  TYR*     3.4    41.1    -      -       +      +
    283D  THR*     4.7     1.9    -      -       +      +
     81E  TRP*     3.6    33.7    -      -       +      +
     85E  GLY*     5.7     0.6    -      -       -      -
     86E  GLY      4.9     3.6    -      -       -      +
----------------------------------------------------------
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Residues in contact with ILE 88 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     39D  ILE*     4.2    22.0    -      -       +      -
     43D  VAL      5.4     0.4    -      -       -      +
     44D  GLY*     4.1    21.8    -      -       -      +
     47D  ALA*     3.8    28.5    -      -       +      +
     48D  ALA*     4.2     3.2    -      -       -      +
     51D  MSE      3.6    15.4    -      -       +      +
     86D  GLY      3.3     1.0    -      -       -      -
     87D  ALA*     1.3    81.1    -      -       +      +
     89D  ILE*     1.3    65.8    +      -       -      +
     91D  ALA*     3.4     3.3    +      -       -      +
     92D  GLY      3.1    17.8    +      -       -      -
     47E  ALA*     4.1     0.7    -      -       +      -
     51E  MSE      5.5     2.5    -      -       -      -
     81E  TRP*     5.3     8.1    -      -       +      -
     88E  ILE*     3.7    44.9    -      -       +      -
     89E  ILE*     4.7    10.3    -      -       +      +
----------------------------------------------------------
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Residues in contact with ILE 89 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     51D  MSE      3.2    34.8    -      -       +      +
     79D  SER*     3.3    18.8    -      -       -      +
     81D  TRP*     3.4    25.4    -      -       +      +
     82D  ALA*     3.1    34.8    -      -       +      +
     85D  GLY*     3.9     4.5    -      -       -      -
     86D  GLY      3.3    26.2    -      -       -      +
     88D  ILE*     1.3    78.7    -      -       -      +
     90D  PHE*     1.3    66.4    +      -       +      +
     92D  GLY*     3.7     0.7    +      -       -      -
     93D  ILE*     3.1    34.8    +      -       +      +
     43E  VAL      4.8     0.2    -      -       -      +
     88E  ILE*     4.9     6.1    -      -       +      +
----------------------------------------------------------
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Residues in contact with PHE 90 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     72D  TRP*     4.3    12.8    -      +       -      -
     76D  TYR*     3.8    24.0    -      +       -      -
     82D  ALA*     3.1    35.0    -      -       +      -
     85D  GLY*     3.4    23.8    -      -       -      -
     86D  GLY      3.2    22.4    +      -       -      +
     89D  ILE*     1.3    78.1    -      -       +      +
     91D  ALA*     1.3    56.2    +      -       -      +
     92D  GLY      3.3     0.2    -      -       -      -
     93D  ILE*     3.9    16.5    -      -       +      +
     94D  SER*     2.4    40.4    +      -       -      -
    260D  TYR*     3.9     7.2    -      -       +      -
    261D  THR*     3.6    32.1    -      -       +      -
    283D  THR      3.2    19.7    -      -       -      +
    285D  GLY*     4.1     4.1    -      -       -      +
    237E  PHE*     3.8     7.6    -      +       -      -
----------------------------------------------------------
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Residues in contact with ALA 91 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     37D  ALA*     3.4    16.8    -      -       +      +
     38D  GLY      4.1     3.6    -      -       -      +
     39D  ILE*     3.7    27.4    -      -       +      -
     48D  ALA*     5.1     1.6    -      -       +      -
     87D  ALA      2.9    23.8    +      -       -      +
     88D  ILE      3.8     3.1    -      -       -      +
     89D  ILE      3.4     0.2    -      -       -      -
     90D  PHE*     1.3    75.8    -      -       -      +
     92D  GLY*     1.3    61.6    +      -       -      +
     94D  SER*     3.5     1.4    -      -       -      -
     95D  ALA      3.0    23.2    +      -       -      -
    282D  GLY      3.1    19.3    -      -       -      +
    283D  THR*     4.1     3.3    +      -       +      +
----------------------------------------------------------
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Residues in contact with GLY 92 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     37D  ALA*     4.6     0.4    -      -       -      +
     48D  ALA*     4.9     1.5    +      -       -      +
     51D  MSE      4.4     4.5    -      -       -      -
     52D  ILE*     3.7    24.9    -      -       -      +
     55D  LEU*     3.7    13.7    -      -       -      -
     88D  ILE      3.1    14.8    +      -       -      -
     91D  ALA*     1.3    76.0    -      -       -      +
     93D  ILE*     1.3    63.5    +      -       -      +
     95D  ALA*     3.2     4.3    +      -       -      +
     96D  ILE*     3.2    26.2    +      -       -      +
----------------------------------------------------------
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Residues in contact with ILE 93 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     55D  LEU*     3.6    17.7    -      -       +      +
     72D  TRP*     3.4    39.7    -      -       +      +
     75D  MSE      3.9    41.6    -      -       +      +
     76D  TYR*     4.5     3.6    -      -       +      +
     82D  ALA*     4.5     2.2    -      -       +      -
     89D  ILE*     3.1    32.9    +      -       +      +
     90D  PHE*     3.9    22.9    -      -       +      +
     92D  GLY*     1.3    75.3    -      -       -      +
     94D  SER*     1.3    57.3    +      -       -      +
     96D  ILE*     3.4     6.3    +      -       -      +
     97D  GLU*     2.9    27.4    +      -       -      +
    285D  GLY      4.2     1.3    -      -       -      +
----------------------------------------------------------
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Residues in contact with SER 94 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     90D  PHE      2.4    28.4    +      -       -      -
     91D  ALA      3.5     0.4    -      -       -      -
     92D  GLY      3.2     0.2    -      -       -      -
     93D  ILE*     1.3    74.5    -      -       -      +
     95D  ALA*     1.3    66.0    +      -       -      +
     97D  GLU*     3.3     1.6    +      -       -      +
     98D  GLN*     3.0    31.2    +      -       -      +
    281D  ILE      3.4    18.4    -      -       -      -
    282D  GLY*     3.4    15.3    -      -       -      -
    283D  THR      3.6     4.0    -      -       -      -
    285D  GLY      2.8    36.8    +      -       -      -
    286D  GLY*     3.7     1.3    -      -       -      -
----------------------------------------------------------
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Residues in contact with ALA 95 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     23D  VAL*     3.5    18.8    -      -       +      +
     35D  GLY*     3.4    12.0    -      -       -      -
     36D  GLU*     3.8    14.6    +      -       -      +
     37D  ALA*     3.6    20.2    -      -       -      +
     52D  ILE*     3.9    13.7    -      -       +      -
     91D  ALA      3.0    13.9    +      -       -      +
     92D  GLY      3.2     9.2    +      -       -      +
     94D  SER*     1.3    76.3    -      -       -      +
     96D  ILE*     1.3    63.5    +      -       -      +
     98D  GLN*     3.3     0.9    +      -       -      +
     99D  ALA      3.2    16.1    +      -       -      -
----------------------------------------------------------
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Residues in contact with ILE 96 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     23D  VAL*     4.6     6.7    -      -       +      -
     25D  ILE*     4.2     9.0    -      -       +      -
     52D  ILE*     4.5    15.7    -      -       +      +
     55D  LEU*     3.7    31.0    -      -       +      -
     56D  SER*     4.4     5.8    -      -       -      +
     60D  LEU*     3.8    33.4    -      -       +      -
     75D  MSE      3.8    30.3    -      -       +      -
     92D  GLY      3.2    13.6    +      -       -      +
     93D  ILE      3.7     6.3    -      -       -      +
     95D  ALA*     1.3    74.6    -      -       -      +
     97D  GLU*     1.3    67.5    +      -       -      +
     99D  ALA*     3.1     5.5    +      -       -      +
    100D  LEU*     3.0    31.6    +      -       +      +
----------------------------------------------------------
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Residues in contact with GLU 97 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     68D  ILE*     4.2    10.1    -      -       +      -
     72D  TRP*     3.9    22.1    -      -       +      -
     75D  MSE      5.2     1.8    -      -       +      +
     93D  ILE      2.9    17.8    +      -       -      +
     94D  SER      3.7     3.1    -      -       -      +
     96D  ILE*     1.3    76.1    -      -       -      +
     98D  GLN*     1.3    68.6    +      -       -      +
    100D  LEU*     3.1    20.5    +      -       +      +
    101D  TRP*     3.0    42.4    +      -       +      +
    285D  GLY      4.0     7.4    -      -       -      +
    286D  GLY*     3.2     6.1    -      -       -      -
    287D  LEU*     2.7    23.6    +      -       -      -
    288D  MSE      2.8    31.5    +      -       -      +
    289D  GLU      3.9     2.1    +      -       -      -
----------------------------------------------------------
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Residues in contact with GLN 98 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     34D  ALA      3.8     3.5    -      -       -      +
     35D  GLY*     3.8     6.8    -      -       -      -
     36D  GLU*     3.0    43.7    +      -       -      +
     94D  SER      3.0    16.8    +      -       -      +
     95D  ALA      3.5     7.0    -      -       -      +
     96D  ILE      3.2     0.2    -      -       -      -
     97D  GLU*     1.3    86.9    +      -       -      +
     99D  ALA*     1.3    57.1    +      -       -      +
    101D  TRP*     3.3     6.6    +      -       -      +
    102D  ASP*     3.0    26.9    +      -       -      +
    281D  ILE*     3.2    43.9    +      -       +      +
    282D  GLY*     3.6     5.7    -      -       -      -
    287D  LEU*     4.6    11.9    -      -       +      +
    313D  LEU*     5.2     1.4    -      -       -      +
    314D  ILE*     4.7     3.4    -      -       -      +
    317D  ALA*     4.1    13.1    -      -       +      +
    366D  LEU*     3.9     9.9    -      -       +      +
----------------------------------------------------------
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Residues in contact with ALA 99 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     23D  VAL*     4.4     3.8    -      -       +      -
     25D  ILE*     3.5    21.8    -      -       +      -
     33D  GLY*     3.6    23.4    -      -       -      +
     34D  ALA      3.3    17.7    +      -       -      -
     35D  GLY      4.0     0.7    -      -       -      +
     95D  ALA      3.2     7.2    +      -       -      +
     96D  ILE      3.1    10.1    +      -       -      +
     98D  GLN*     1.3    79.0    -      -       -      +
    100D  LEU*     1.3    62.1    +      -       -      +
    102D  ASP*     3.4     2.4    +      -       -      +
    103D  ILE*     3.1    28.7    +      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 100 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
      5D  ILE*     4.2     9.4    -      -       +      -
     25D  ILE*     3.8    18.8    -      -       +      -
     60D  LEU*     5.1     0.4    -      -       +      -
     65D  PRO*     3.9    31.8    -      -       +      +
     68D  ILE*     3.6    29.2    -      -       +      +
     71D  LEU*     3.6    32.5    -      -       +      -
     75D  MSE      5.1     2.5    -      -       +      -
     96D  ILE*     3.0    31.9    +      -       +      +
     97D  GLU*     3.1    12.8    +      -       +      +
     99D  ALA*     1.3    78.1    -      -       -      +
    101D  TRP*     1.3    58.3    +      -       -      +
    103D  ILE*     3.4     6.8    +      -       +      +
    104D  LYS*     3.0    26.0    +      -       -      +
----------------------------------------------------------
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Residues in contact with TRP 101 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     68D  ILE*     3.4    19.5    -      -       +      +
     69D  GLU*     5.2     1.3    -      -       -      -
     97D  GLU*     3.0    56.6    +      -       +      -
     98D  GLN      3.3     5.6    +      -       -      +
    100D  LEU*     1.3    73.3    -      -       -      +
    102D  ASP*     1.3    61.8    +      -       -      +
    104D  LYS*     3.5    25.0    -      -       +      +
    105D  GLY      2.8    24.8    +      -       -      -
    112D  VAL*     3.6    28.1    -      -       +      +
    115D  LEU*     4.0    15.7    -      -       +      +
    116D  PHE*     3.7    25.8    -      +       -      -
    287D  LEU*     4.4    10.1    -      -       +      -
    288D  MSE      3.8    28.3    -      -       +      +
    115G  LEU      3.5    26.0    -      -       -      -
    116G  PHE      4.4     0.2    -      -       -      -
    117G  GLY*     3.5    25.4    -      -       -      -
----------------------------------------------------------
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Residues in contact with ASP 102 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     33D  GLY*     3.2     8.0    -      -       -      -
     34D  ALA*     2.9    24.6    +      -       -      +
     98D  GLN      3.0    13.0    +      -       -      +
     99D  ALA      3.5     6.7    -      -       -      +
    101D  TRP*     1.3    77.7    -      -       -      +
    103D  ILE*     1.3    57.5    +      -       -      +
    106D  LYS*     3.1    54.4    +      -       -      +
    365D  GLY*     3.4     7.0    -      -       -      -
    366D  LEU*     2.6    57.1    +      -       +      +
    367D  GLY      4.2     0.9    +      -       -      -
    368D  ALA      5.2     4.7    +      -       -      +
----------------------------------------------------------
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Residues in contact with ILE 103 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
      3D  LEU*     4.0    19.7    -      -       +      -
     25D  ILE*     4.0    24.9    -      -       +      -
     27D  THR*     4.0    15.0    -      -       +      -
     31D  ILE*     3.9    22.7    -      -       +      +
     32D  THR      3.8     4.0    -      -       -      -
     33D  GLY      3.5    24.7    -      -       -      +
     65D  PRO*     4.4    20.6    -      -       +      -
     99D  ALA      3.1    19.5    +      -       -      +
    100D  LEU*     3.7     7.4    -      -       +      +
    101D  TRP      3.2     0.2    -      -       -      -
    102D  ASP*     1.3    75.0    -      -       -      +
    104D  LYS*     1.3    66.9    +      -       -      +
    105D  GLY      3.2     0.2    +      -       -      -
    106D  LYS*     3.2     3.9    +      -       -      +
    107D  CYS*     3.0    24.8    +      -       -      -
----------------------------------------------------------
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Residues in contact with LYS 104 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     65D  PRO      5.6     2.0    +      -       -      +
     66D  SER*     3.1    31.2    +      -       -      +
     68D  ILE*     3.4    23.8    -      -       +      -
    100D  LEU      3.0    16.9    +      -       -      +
    101D  TRP*     3.5    28.0    -      -       +      +
    103D  ILE*     1.3    77.5    -      -       -      +
    105D  GLY*     1.3    61.8    +      -       -      +
    107D  CYS*     3.6     5.8    +      -       -      +
    108D  LEU*     3.3    33.8    +      -       +      +
    115D  LEU*     3.9    11.0    -      -       +      -
    114G  GLU*     2.8    45.6    +      -       -      +
    115G  LEU*     4.8     0.7    -      -       -      +
    117G  GLY*     4.1     4.0    -      -       -      -
    118G  GLY      3.8     1.8    -      -       -      +
----------------------------------------------------------
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Residues in contact with GLY 105 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    101D  TRP      2.8    17.8    +      -       -      -
    104D  LYS*     1.3    75.4    -      -       -      +
    106D  LYS*     1.3    59.7    +      -       -      +
    108D  LEU*     3.0     4.2    +      -       -      +
    109D  GLY      2.8    24.1    +      -       -      -
    110D  VAL      3.1    22.7    +      -       -      -
    112D  VAL*     5.0     0.7    -      -       -      -
    115D  LEU*     4.0    11.6    -      -       -      +
    365D  GLY*     3.5    12.8    -      -       -      -
----------------------------------------------------------
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Residues in contact with LYS 106 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     31D  ILE*     4.1    16.6    -      -       +      -
     32D  THR*     2.7    38.8    +      -       -      +
     33D  GLY*     4.6     0.2    -      -       -      -
     34D  ALA*     5.3     0.6    -      -       -      +
    102D  ASP*     3.1    38.5    +      -       -      +
    103D  ILE      3.2     4.0    +      -       -      +
    105D  GLY*     1.3    74.1    -      -       -      +
    107D  CYS*     1.3    63.0    +      -       -      +
    109D  GLY*     3.0    12.0    +      -       -      -
    364D  PRO*     3.9    23.5    -      -       +      +
    365D  GLY*     3.6     7.8    -      -       -      +
    367D  GLY      6.1     0.2    -      -       -      +
    368D  ALA      5.0    10.5    +      -       -      +
----------------------------------------------------------
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Residues in contact with CYS 107 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
      3D  LEU*     3.7    23.1    -      -       -      -
     31D  ILE*     3.4    32.3    -      -       -      -
    103D  ILE*     3.0    23.0    +      -       -      +
    104D  LYS*     3.8     8.3    -      -       -      +
    106D  LYS*     1.3    78.6    -      -       -      +
    108D  LEU*     1.3    66.9    +      -       +      +
    109D  GLY      3.5     0.2    +      -       -      -
----------------------------------------------------------
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Residues in contact with LEU 108 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    104D  LYS*     3.3    25.8    +      -       +      +
    105D  GLY      3.0     4.6    +      -       -      +
    107D  CYS*     1.3    84.0    -      -       +      +
    109D  GLY*     1.3    63.4    +      -       -      +
    110D  VAL*     3.3    20.5    +      -       +      +
    115D  LEU*     3.5    26.5    -      -       +      -
    108G  LEU*     3.9    23.0    -      -       +      +
    110G  VAL*     3.9    31.0    -      -       +      -
    114G  GLU*     5.6     3.1    -      -       +      +
    115G  LEU*     4.1    13.5    -      -       +      -
----------------------------------------------------------
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Residues in contact with GLY 109 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    105D  GLY      2.8     8.2    +      -       -      -
    106D  LYS      3.0    12.2    +      -       -      -
    107D  CYS      3.2     1.4    +      -       -      -
    108D  LEU*     1.3    77.3    -      -       -      +
    110D  VAL*     1.3    63.0    +      -       -      +
    111D  PRO*     4.8     0.2    -      -       -      +
    364D  PRO*     3.8    15.6    -      -       -      +
----------------------------------------------------------
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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