Contacts of the helix formed by residues 86 - 109 (chain A) 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 A).
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     84A  ASN      4.1     0.2    +      -       -      -
     85A  GLY*     1.3    72.6    -      -       -      -
     87A  ALA*     1.3    66.0    +      -       -      -
     88A  ILE      3.3     2.7    -      -       -      -
     89A  ILE*     3.2     8.2    -      -       -      +
     90A  PHE*     3.1    26.3    +      -       -      +
    260A  TYR*     4.0    14.4    -      -       -      -
     84F  ASN      5.3     0.4    -      -       -      -
     85F  GLY      4.9     0.7    -      -       -      -
     86F  GLY*     4.0    26.3    -      -       -      -
     87F  ALA      4.9     1.4    -      -       -      +
----------------------------------------------------------
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Residues in contact with ALA 87 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     39A  ILE*     4.2     6.5    -      -       +      -
     86A  GLY*     1.3    71.6    -      -       -      -
     88A  ILE*     1.3    59.9    +      -       +      +
     91A  ALA*     2.8    35.1    +      -       -      +
    260A  TYR*     3.3    41.9    -      -       +      +
    283A  THR*     4.8     1.8    -      -       -      -
     81F  TRP*     3.5    33.4    -      -       +      +
     85F  GLY*     5.7     0.4    -      -       -      -
     86F  GLY      4.9     3.6    -      -       -      +
----------------------------------------------------------
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Residues in contact with ILE 88 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     39A  ILE*     4.2    23.8    -      -       +      -
     43A  VAL      5.5     0.2    -      -       -      +
     44A  GLY*     4.0    24.0    -      -       -      +
     47A  ALA*     3.9    26.7    -      -       +      +
     48A  ALA*     4.3     3.8    -      -       -      +
     51A  MSE      3.7    15.3    -      -       +      +
     86A  GLY      3.3     0.4    -      -       -      -
     87A  ALA*     1.3    77.3    -      -       +      +
     89A  ILE*     1.3    67.2    +      -       -      +
     91A  ALA*     3.9     2.7    -      -       -      +
     92A  GLY*     3.1    17.5    +      -       -      -
     47F  ALA*     4.1     0.7    -      -       +      -
     51F  MSE      5.5     2.9    -      -       -      -
     81F  TRP*     5.3     8.1    -      -       +      -
     88F  ILE*     3.7    44.0    -      -       +      -
     89F  ILE*     4.8    10.5    -      -       +      +
----------------------------------------------------------
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Residues in contact with ILE 89 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     51A  MSE      3.5    29.8    -      -       -      -
     55A  LEU*     4.3    11.0    -      -       +      +
     79A  SER*     4.0    24.7    -      -       -      +
     81A  TRP*     4.0    13.2    -      -       +      +
     82A  ALA*     3.9    17.9    -      -       -      +
     85A  GLY*     3.8     7.4    -      -       -      -
     86A  GLY      3.2    28.3    -      -       -      +
     88A  ILE*     1.3    77.8    -      -       -      +
     90A  PHE*     1.3    76.1    +      -       +      +
     92A  GLY*     3.3     3.3    +      -       -      -
     93A  ILE*     3.0    36.5    +      -       +      +
     43F  VAL      4.6     3.1    -      -       -      +
     88F  ILE*     4.7     7.1    -      -       +      +
----------------------------------------------------------
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Residues in contact with PHE 90 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     72A  TRP*     4.2    11.0    -      +       -      -
     76A  TYR*     3.8    21.5    -      +       -      -
     82A  ALA*     3.2    30.7    -      -       +      -
     85A  GLY*     3.5    23.1    -      -       -      -
     86A  GLY      3.1    22.6    +      -       -      +
     89A  ILE*     1.3    83.4    -      -       +      +
     91A  ALA*     1.3    55.8    +      -       -      +
     93A  ILE*     3.7    26.7    -      -       +      +
     94A  SER*     2.6    39.1    +      -       -      -
    260A  TYR*     4.1     5.4    -      -       +      -
    261A  THR*     3.4    35.7    -      -       +      -
    283A  THR      3.2    20.0    -      -       -      +
    285A  GLY*     4.3     4.8    -      -       -      +
    237F  PHE*     3.8     5.8    -      +       -      -
----------------------------------------------------------
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Residues in contact with ALA 91 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     37A  ALA*     3.4    20.2    -      -       +      +
     39A  ILE*     3.6    29.2    -      -       +      -
     48A  ALA*     5.1     1.3    -      -       +      -
     87A  ALA      2.8    22.1    +      -       -      +
     88A  ILE*     3.9     3.1    -      -       -      +
     90A  PHE*     1.3    75.8    -      -       -      +
     92A  GLY*     1.3    63.7    +      -       -      +
     94A  SER*     3.7     0.3    -      -       -      -
     95A  ALA*     3.0    18.5    +      -       -      +
    282A  GLY      3.1    20.6    -      -       -      +
    283A  THR*     4.0     4.2    +      -       +      +
----------------------------------------------------------
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Residues in contact with GLY 92 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     37A  ALA*     4.9     0.2    -      -       -      -
     48A  ALA*     5.1     1.7    -      -       -      +
     51A  MSE      4.3     4.7    -      -       -      -
     52A  ILE*     3.8    22.5    -      -       -      +
     55A  LEU*     3.7    12.8    -      -       -      -
     88A  ILE      3.1    13.6    +      -       -      -
     89A  ILE      3.7     3.1    -      -       -      -
     91A  ALA*     1.3    75.3    -      -       -      +
     93A  ILE*     1.3    65.4    +      -       -      +
     95A  ALA*     3.3     3.6    +      -       -      +
     96A  ILE*     3.2    26.7    +      -       -      +
----------------------------------------------------------
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Residues in contact with ILE 93 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     55A  LEU*     3.6    15.7    -      -       +      +
     72A  TRP*     3.2    40.8    -      -       +      +
     75A  MSE      4.0    43.6    -      -       +      +
     76A  TYR*     4.6     2.7    -      -       +      +
     82A  ALA*     4.5     3.4    -      -       +      -
     89A  ILE*     3.0    34.9    +      -       +      +
     90A  PHE*     3.9    24.5    -      -       +      +
     92A  GLY*     1.3    76.6    -      -       -      +
     94A  SER*     1.3    56.9    +      -       -      +
     96A  ILE*     3.3     4.0    +      -       -      +
     97A  GLU*     2.9    26.7    +      -       -      +
    285A  GLY      4.2     1.3    -      -       -      +
----------------------------------------------------------
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Residues in contact with SER 94 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     90A  PHE      2.6    28.1    +      -       -      -
     91A  ALA      3.7     0.2    -      -       -      -
     93A  ILE*     1.3    74.0    -      -       -      +
     95A  ALA*     1.3    63.8    +      -       -      +
     97A  GLU*     3.3     1.7    +      -       -      +
     98A  GLN*     2.9    29.5    +      -       -      +
    281A  ILE      3.2    21.3    +      -       -      -
    282A  GLY*     3.5    15.3    -      -       -      -
    283A  THR      3.6     4.5    -      -       -      -
    285A  GLY      2.8    35.7    +      -       -      -
    286A  GLY*     3.6     1.0    -      -       -      -
----------------------------------------------------------
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Residues in contact with ALA 95 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     23A  VAL*     3.5    20.3    -      -       +      +
     35A  GLY*     3.3    12.5    -      -       -      -
     36A  GLU*     3.6    14.3    +      -       -      +
     37A  ALA      3.6    20.6    -      -       -      +
     52A  ILE*     3.9    13.7    -      -       +      -
     91A  ALA      3.0    16.6    +      -       -      +
     92A  GLY      3.7     4.9    -      -       -      +
     94A  SER*     1.3    76.6    -      -       -      +
     96A  ILE*     1.3    62.1    +      -       -      +
     98A  GLN*     3.4     1.2    +      -       -      +
     99A  ALA      3.2    15.9    +      -       -      -
----------------------------------------------------------
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Residues in contact with ILE 96 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     23A  VAL*     4.4    10.1    -      -       +      -
     25A  ILE*     4.3     5.4    -      -       +      -
     52A  ILE*     4.4    15.7    -      -       +      -
     55A  LEU*     3.8    28.9    -      -       +      -
     56A  SER*     4.1     7.4    -      -       -      +
     60A  LEU*     3.8    35.4    -      -       +      -
     75A  MSE      3.8    26.5    -      -       +      -
     92A  GLY      3.2    14.6    +      -       -      +
     93A  ILE      3.6     7.0    -      -       -      +
     95A  ALA*     1.3    77.4    -      -       -      +
     97A  GLU*     1.3    62.9    +      -       -      +
     99A  ALA*     3.1     5.5    +      -       -      +
    100A  LEU*     3.0    33.4    +      -       +      +
----------------------------------------------------------
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Residues in contact with GLU 97 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     68A  ILE*     4.2    11.2    -      -       +      -
     72A  TRP*     3.9    24.0    -      -       +      -
     75A  MSE      5.6     1.3    -      -       +      -
     93A  ILE      2.9    17.0    +      -       -      +
     94A  SER      3.6     3.8    -      -       -      +
     96A  ILE*     1.3    76.6    -      -       -      +
     98A  GLN*     1.3    67.7    +      -       -      +
    100A  LEU*     3.2    12.9    +      -       +      +
    101A  TRP*     3.0    47.4    +      -       -      +
    285A  GLY      4.0     7.6    -      -       -      +
    286A  GLY*     3.4     4.8    -      -       -      -
    287A  LEU*     2.8    22.7    +      -       -      +
    288A  MSE      2.8    32.2    +      -       -      +
    289A  GLU      3.9     2.6    +      -       -      -
----------------------------------------------------------
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Residues in contact with GLN 98 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     34A  ALA      3.8     2.9    -      -       -      +
     35A  GLY*     3.6     5.6    -      -       -      -
     36A  GLU*     2.9    45.2    +      -       -      +
     94A  SER      2.9    19.2    +      -       -      +
     95A  ALA      3.5     5.2    -      -       -      +
     97A  GLU*     1.3    83.4    +      -       -      +
     99A  ALA*     1.3    64.1    +      -       -      +
    101A  TRP*     3.2     4.7    +      -       -      +
    102A  ASP*     3.0    22.0    +      -       -      +
    281A  ILE*     3.3    35.6    +      -       +      +
    282A  GLY*     3.6     5.5    -      -       -      -
    287A  LEU*     4.3    25.1    -      -       +      +
    313A  LEU*     5.3     1.0    -      -       -      +
    314A  ILE*     4.5     2.5    -      -       -      +
    317A  ALA*     4.3    11.4    -      -       +      +
    366A  LEU*     3.9     9.7    -      -       +      +
----------------------------------------------------------
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Residues in contact with ALA 99 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     23A  VAL*     4.4     3.6    -      -       +      -
     25A  ILE*     3.4    29.2    -      -       +      -
     33A  GLY*     3.5    21.2    -      -       -      +
     34A  ALA      3.4    19.3    +      -       -      +
     35A  GLY      3.9     0.9    -      -       -      +
     95A  ALA      3.2     7.4    +      -       -      +
     96A  ILE      3.1     4.1    +      -       -      +
     98A  GLN*     1.3    79.0    -      -       -      +
    100A  LEU*     1.3    62.3    +      -       -      +
    102A  ASP*     3.4     2.2    -      -       -      +
    103A  ILE*     3.1    28.1    +      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 100 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
      5A  ILE*     4.3     9.6    -      -       +      -
     25A  ILE*     4.2    15.5    -      -       +      -
     60A  LEU*     5.4     1.3    -      -       +      -
     65A  PRO*     3.7    36.7    -      -       +      +
     68A  ILE*     3.7    32.7    -      -       +      +
     71A  LEU*     4.2    27.4    -      -       +      -
     72A  TRP      5.7     0.2    -      -       -      +
     75A  MSE      5.3     1.8    -      -       +      -
     96A  ILE*     3.0    32.5    +      -       +      +
     97A  GLU*     3.4    11.0    -      -       -      +
     98A  GLN      3.1     0.4    -      -       -      -
     99A  ALA*     1.3    77.6    -      -       -      +
    101A  TRP*     1.3    57.6    +      -       -      +
    103A  ILE*     3.2     8.7    +      -       +      +
    104A  LYS*     3.0    26.2    +      -       -      +
----------------------------------------------------------
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Residues in contact with TRP 101 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     68A  ILE*     3.5    22.5    -      -       +      +
     69A  GLU*     5.8     1.1    -      -       +      -
     97A  GLU*     3.0    56.3    +      -       +      -
     98A  GLN      3.2     5.8    +      -       -      +
    100A  LEU*     1.3    74.0    -      -       -      +
    102A  ASP*     1.3    60.7    +      -       -      +
    104A  LYS*     3.7    17.7    -      -       +      +
    105A  GLY      2.9    26.3    +      -       -      -
    112A  VAL*     3.5    26.4    -      -       +      +
    115A  LEU*     3.9    20.2    -      -       +      -
    116A  PHE*     3.8    23.6    -      +       -      -
    287A  LEU*     4.3    12.6    -      -       +      -
    288A  MSE      3.6    29.6    -      -       +      +
    115E  LEU      3.6    16.8    -      -       -      -
    117E  GLY*     3.5    32.8    -      -       -      -
----------------------------------------------------------
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Residues in contact with ASP 102 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     33A  GLY*     3.6     4.1    -      -       -      -
     34A  ALA*     3.0    27.5    +      -       -      +
     98A  GLN      3.0    13.4    +      -       -      +
     99A  ALA      3.4    10.3    -      -       -      +
    101A  TRP*     1.3    78.9    -      -       -      +
    103A  ILE*     1.3    56.9    +      -       -      +
    106A  LYS*     3.0    56.7    +      -       -      +
    112A  VAL*     4.4     0.6    -      -       -      +
    364A  PRO      4.2     0.2    -      -       -      +
    365A  GLY*     3.5     3.5    -      -       -      -
    366A  LEU*     2.7    53.0    +      -       +      +
    367A  GLY      4.4     1.0    +      -       -      -
    368A  ALA      4.7     6.3    -      -       -      +
----------------------------------------------------------
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Residues in contact with ILE 103 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
      3A  LEU*     3.9    27.4    -      -       +      -
     25A  ILE*     3.9    28.3    -      -       +      +
     27A  THR*     4.0    13.0    -      -       +      -
     31A  ILE*     4.2    13.0    -      -       +      +
     32A  THR      3.7     4.9    -      -       -      -
     33A  GLY*     3.5    26.0    -      -       -      +
     65A  PRO*     4.2    22.7    -      -       +      -
     99A  ALA      3.1    19.9    +      -       -      +
    100A  LEU*     3.2     9.2    +      -       +      +
    102A  ASP*     1.3    76.6    -      -       -      +
    104A  LYS*     1.3    59.2    +      -       -      +
    106A  LYS*     3.3     2.3    +      -       -      +
    107A  CYS*     2.9    30.5    +      -       -      -
----------------------------------------------------------
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Residues in contact with LYS 104 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     65A  PRO      5.7     0.4    -      -       -      +
     66A  SER*     3.0    39.3    +      -       -      +
     68A  ILE*     3.5    17.5    -      -       -      -
    100A  LEU      3.0    16.0    +      -       -      +
    101A  TRP*     3.3    26.4    +      -       +      +
    103A  ILE*     1.3    77.3    -      -       -      +
    105A  GLY*     1.3    64.1    +      -       -      +
    107A  CYS*     3.2     8.9    +      -       +      +
    108A  LEU*     3.0    34.2    +      -       +      +
    115A  LEU*     3.9    11.2    -      -       +      -
    114E  GLU*     3.0    46.7    +      -       -      +
    115E  LEU*     4.9     0.9    -      -       -      +
    117E  GLY*     4.3     5.4    -      -       -      -
    118E  GLY      4.0     0.6    -      -       -      +
----------------------------------------------------------
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Residues in contact with GLY 105 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    101A  TRP      2.9    16.5    +      -       -      -
    104A  LYS*     1.3    75.8    -      -       -      +
    106A  LYS*     1.3    51.9    +      -       -      +
    108A  LEU*     3.3     2.7    +      -       -      -
    109A  GLY*     2.8    30.5    +      -       -      -
    110A  VAL*     3.0    28.1    +      -       -      -
    112A  VAL*     4.9     0.7    -      -       -      -
    115A  LEU*     4.0    14.0    -      -       -      +
    365A  GLY*     3.6     8.5    +      -       -      -
----------------------------------------------------------
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Residues in contact with LYS 106 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     31A  ILE*     3.9    19.3    -      -       +      +
     32A  THR*     2.8    40.7    +      -       -      +
     34A  ALA*     5.5     0.6    -      -       -      +
    102A  ASP*     3.0    38.3    +      -       -      +
    103A  ILE      3.7     4.3    -      -       -      +
    104A  LYS      3.3     0.2    -      -       -      -
    105A  GLY*     1.3    75.3    -      -       -      +
    107A  CYS*     1.3    63.1    +      -       -      +
    109A  GLY*     3.3    10.6    +      -       -      -
    364A  PRO*     4.2    29.4    -      -       +      +
    365A  GLY      3.8     0.4    -      -       -      +
    368A  ALA      4.8    11.2    +      -       -      -
    369A  VAL*     6.1     1.5    -      -       -      +
----------------------------------------------------------
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Residues in contact with CYS 107 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
      3A  LEU*     3.4    35.2    -      -       -      -
     31A  ILE*     3.6    17.9    -      -       -      -
    103A  ILE*     2.9    26.2    +      -       -      +
    104A  LYS*     3.5     8.3    -      -       +      +
    105A  GLY      3.2     0.2    -      -       -      -
    106A  LYS*     1.3    79.3    -      -       -      +
    108A  LEU*     1.3    65.9    +      -       +      +
----------------------------------------------------------
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Residues in contact with LEU 108 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    104A  LYS*     3.0    28.4    +      -       +      +
    105A  GLY      4.1     2.0    -      -       -      +
    107A  CYS*     1.3    81.4    -      -       +      +
    109A  GLY*     1.3    63.2    +      -       -      +
    110A  VAL*     3.4    17.8    +      -       +      +
    115A  LEU*     3.5    26.9    -      -       +      -
    108E  LEU*     3.9    27.0    -      -       +      +
    110E  VAL*     3.5    32.8    -      -       +      -
    114E  GLU*     5.4     2.9    -      -       +      +
    115E  LEU*     3.9    16.2    -      -       +      -
----------------------------------------------------------
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Residues in contact with GLY 109 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    105A  GLY      2.8     9.2    +      -       -      -
    106A  LYS      3.3     7.5    +      -       -      -
    107A  CYS      3.3     4.0    +      -       -      -
    108A  LEU*     1.3    75.0    -      -       -      +
    110A  VAL*     1.3    68.1    +      -       -      +
    364A  PRO*     3.9    14.1    -      -       -      +
----------------------------------------------------------
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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