Contacts of the helix formed by residues 72 - 99 (chain A) in PDB entry 5OQN


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 GLU 72 (chain A).
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     68A  LEU*     4.0    30.6    -      -       +      +
     69A  LYS*     3.4    48.5    +      -       -      +
     70A  LYS      3.0     4.7    +      -       -      +
     71A  ASN*     1.3    75.1    -      -       -      +
     73A  ILE*     1.3    69.2    +      -       -      +
     74A  ILE*     2.9    15.4    +      -       +      +
     75A  GLY      3.1     7.8    +      -       -      -
     76A  ASP*     3.1    12.5    -      -       -      +
    136A  ARG*     3.4     5.7    +      -       -      +
    457B  LYS*     4.8    11.6    +      -       -      -
    459B  LEU*     4.7    15.2    -      -       +      +
----------------------------------------------------------
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Residues in contact with ILE 73 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     28A  TYR*     4.9     7.6    -      -       -      +
     71A  ASN      3.1     7.8    +      -       -      +
     72A  GLU*     1.3    74.5    +      -       -      +
     74A  ILE*     1.3    82.0    +      -       +      +
     76A  ASP*     3.7     8.6    +      -       +      +
     77A  ARG*     3.1    61.7    +      -       +      +
    458B  VAL*     5.3    13.0    -      -       +      -
----------------------------------------------------------
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Residues in contact with ILE 74 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     25A  GLN*     3.5    47.8    -      -       +      +
     65A  ILE*     5.3     1.1    -      -       +      -
     68A  LEU*     4.1    15.7    -      -       +      -
     72A  GLU*     2.9    10.6    +      -       +      -
     73A  ILE*     1.3    94.0    -      -       +      +
     75A  GLY*     1.3    68.5    +      -       -      +
     77A  ARG*     3.2    12.1    +      -       -      +
     78A  ILE*     3.3    16.2    +      -       +      +
    458B  VAL*     5.0     1.1    -      -       +      -
    459B  LEU*     3.3    53.4    -      -       +      +
    461B  ILE*     4.5     9.9    -      -       +      -
    463B  PHE*     5.5     0.4    -      -       +      -
----------------------------------------------------------
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Residues in contact with GLY 75 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     65A  ILE*     4.8     7.2    -      -       -      -
     68A  LEU*     3.8    15.7    -      -       -      +
     72A  GLU      3.1     7.5    +      -       -      -
     74A  ILE*     1.3    77.5    -      -       -      +
     76A  ASP*     1.3    64.7    +      -       -      +
     78A  ILE*     2.8    10.4    +      -       -      +
     79A  VAL*     2.8    29.9    +      -       -      +
    136A  ARG*     3.9    16.8    -      -       -      -
----------------------------------------------------------
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Residues in contact with ASP 76 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     28A  TYR*     4.0    14.6    -      -       -      +
     71A  ASN*     4.0    12.8    -      -       -      +
     72A  GLU      3.1    19.4    -      -       -      +
     73A  ILE*     3.9    11.0    -      -       +      +
     74A  ILE      3.4     0.8    -      -       -      -
     75A  GLY*     1.3    72.1    -      -       -      +
     77A  ARG*     1.3    58.5    +      -       -      +
     79A  VAL*     3.2     7.2    +      -       -      +
     80A  LYS*     2.8    48.2    +      -       +      +
    136A  ARG*     4.0    12.4    +      -       -      +
    139A  GLN*     4.4    12.6    +      -       -      +
----------------------------------------------------------
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Residues in contact with ARG 77 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     24A  ALA      3.7    13.5    -      -       -      +
     25A  GLN*     2.8    26.4    +      -       -      +
     26A  GLY      3.3    18.4    +      -       -      -
     27A  SER*     3.6    22.5    -      -       -      +
     28A  TYR*     3.4    41.8    -      -       +      +
     31A  HIS*     3.2    12.6    +      -       +      -
     73A  ILE*     3.1    53.9    +      -       -      +
     74A  ILE*     3.6     4.7    -      -       -      +
     75A  GLY      3.0     0.8    +      -       -      -
     76A  ASP*     1.3    74.5    -      -       -      +
     78A  ILE*     1.3    64.0    +      -       -      +
     80A  LYS*     3.4     0.6    +      -       -      +
     81A  LEU*     3.0    19.8    +      -       -      +
    458B  VAL*     5.9     4.9    -      -       -      +
----------------------------------------------------------
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Residues in contact with ILE 78 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     21A  PHE*     3.4    46.2    -      -       +      +
     24A  ALA*     4.3     5.2    -      -       +      -
     25A  GLN*     3.6    39.3    -      -       +      +
     61A  LEU      5.4     0.2    -      -       -      +
     62A  VAL*     5.4     1.6    -      -       +      -
     65A  ILE*     3.8    36.8    -      -       +      -
     74A  ILE*     3.4    15.3    -      -       +      +
     75A  GLY      2.8     4.8    +      -       -      +
     77A  ARG*     1.3    74.9    -      -       -      +
     79A  VAL*     1.3    58.2    +      -       -      +
     81A  LEU*     3.1     7.3    +      -       +      +
     82A  VAL*     2.8    37.6    +      -       +      +
    463B  PHE*     4.5     2.9    -      -       +      -
----------------------------------------------------------
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Residues in contact with VAL 79 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     65A  ILE*     4.2     9.9    -      -       +      -
     75A  GLY      2.8    24.3    +      -       -      +
     76A  ASP*     3.6     7.6    -      -       -      +
     78A  ILE*     1.3    75.9    -      -       -      +
     80A  LYS*     1.3    68.0    +      -       +      +
     82A  VAL*     3.2     4.2    +      -       -      +
     83A  ALA*     2.8    22.9    +      -       -      +
    136A  ARG*     4.2    14.4    -      -       +      +
    139A  GLN*     4.4    22.0    -      -       +      +
    140A  LEU*     3.6    34.3    -      -       +      -
    143A  VAL*     4.1    22.8    -      -       +      +
----------------------------------------------------------
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Residues in contact with LYS 80 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     28A  TYR*     4.5    21.5    -      -       +      +
     31A  HIS*     4.2    12.6    -      -       +      +
     76A  ASP*     2.8    42.6    +      -       -      +
     77A  ARG*     3.7     6.3    -      -       -      +
     79A  VAL*     1.3    75.5    -      -       +      +
     81A  LEU*     1.3    58.1    +      -       -      +
     83A  ALA*     3.6     6.2    -      -       -      +
     84A  ALA*     2.8    31.5    +      -       -      +
    139A  GLN*     6.1     1.2    -      -       -      +
    143A  VAL*     5.7     7.1    -      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 81 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     20A  VAL*     4.4    14.1    -      -       +      -
     21A  PHE*     4.8    20.6    -      -       +      -
     24A  ALA*     3.5    30.1    -      -       +      -
     31A  HIS*     3.8    17.2    +      -       +      +
     34A  HIS*     4.4    10.8    -      -       +      +
     35A  ILE*     3.4    25.4    -      -       +      +
     38A  LEU*     4.0    18.8    -      -       +      -
     58A  PHE*     6.2     0.2    -      -       +      -
     77A  ARG      3.0    14.5    +      -       -      +
     78A  ILE*     3.4    10.1    -      -       -      +
     80A  LYS*     1.3    76.3    -      -       -      +
     82A  VAL*     1.3    61.8    +      -       +      +
     84A  ALA*     3.1     3.4    +      -       -      -
     85A  PHE*     2.8    27.3    +      -       +      +
----------------------------------------------------------
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Residues in contact with VAL 82 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     21A  PHE*     4.3     5.4    -      -       +      -
     58A  PHE*     4.2    22.0    -      -       +      -
     62A  VAL*     4.1    24.7    -      -       +      -
     78A  ILE*     2.8    35.3    +      -       +      +
     79A  VAL*     3.7     5.6    -      -       -      +
     81A  LEU*     1.3    72.2    -      -       +      +
     83A  ALA*     1.3    63.0    +      -       -      +
     85A  PHE*     3.2     7.6    +      -       -      +
     86A  ILE*     3.0    33.7    +      -       +      +
    118A  PHE*     4.0    30.5    -      -       +      -
    140A  LEU*     5.4     6.3    -      -       +      -
    144A  ILE*     4.9     4.7    -      -       +      -
----------------------------------------------------------
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Residues in contact with ALA 83 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     79A  VAL      2.8    17.6    +      -       -      +
     80A  LYS*     3.6     6.7    -      -       -      +
     82A  VAL*     1.3    77.2    -      -       -      +
     84A  ALA*     1.3    57.3    +      -       -      +
     86A  ILE*     3.2     4.0    +      -       -      +
     87A  ALA*     2.9    30.7    +      -       -      +
    143A  VAL*     3.6    33.9    -      -       +      +
    144A  ILE*     4.1    13.4    -      -       +      +
    147A  ASN*     4.5     2.5    -      -       -      +
----------------------------------------------------------
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Residues in contact with ALA 84 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     31A  HIS*     5.6     4.0    -      -       +      -
     35A  ILE*     3.5    22.6    -      -       +      +
     80A  LYS      2.8    20.6    +      -       -      +
     81A  LEU*     3.1     2.2    +      -       -      +
     83A  ALA*     1.3    73.7    -      -       -      +
     85A  PHE*     1.3    56.3    +      -       -      +
     87A  ALA*     3.8     6.0    -      -       -      +
     88A  SER*     2.8    33.1    +      -       -      -
----------------------------------------------------------
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Residues in contact with PHE 85 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     35A  ILE*     3.2    19.6    -      -       +      +
     38A  LEU*     3.3    43.5    -      -       +      -
     39A  LYS*     3.7    22.9    -      -       +      -
     42A  GLN*     3.4    23.1    -      -       -      -
     54A  PHE*     4.0    17.0    -      +       -      -
     58A  PHE*     4.0    20.2    -      +       +      -
     81A  LEU      2.8    20.3    +      -       -      +
     82A  VAL*     3.5     7.4    -      -       -      +
     84A  ALA*     1.3    70.0    -      -       -      +
     86A  ILE*     1.3    67.1    +      -       +      +
     88A  SER*     3.8     1.0    -      -       -      -
     89A  LEU*     3.0    46.7    +      -       +      +
    114A  PHE*     4.2    19.7    -      +       -      -
----------------------------------------------------------
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Residues in contact with ILE 86 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     58A  PHE*     5.5     0.4    -      -       +      -
     82A  VAL*     3.0    21.2    +      -       +      +
     83A  ALA      3.7     5.2    -      -       -      +
     85A  PHE*     1.3    77.5    -      -       +      +
     87A  ALA*     1.3    63.8    +      -       -      +
     89A  LEU*     3.1     7.9    +      -       -      +
     90A  GLU*     2.9    21.0    +      -       -      +
    111A  PHE*     3.9    13.1    -      -       +      -
    114A  PHE*     3.4    36.1    -      -       +      -
    115A  VAL*     4.7    13.5    -      -       +      -
    118A  PHE*     4.9    11.2    -      -       +      -
    144A  ILE*     4.1    28.0    -      -       +      +
    147A  ASN*     3.7    27.6    -      -       +      +
----------------------------------------------------------
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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
----------------------------------------------------------
     83A  ALA      2.9    15.2    +      -       -      +
     84A  ALA*     3.8     7.0    -      -       -      +
     86A  ILE*     1.3    78.0    -      -       -      +
     88A  SER*     1.3    57.8    +      -       -      +
     90A  GLU*     3.0     3.7    +      -       -      +
     91A  ARG*     2.8    32.8    +      -       +      +
    147A  ASN*     3.3    33.1    +      -       -      +
----------------------------------------------------------
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Residues in contact with SER 88 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     35A  ILE*     3.7    17.3    -      -       -      +
     39A  LYS*     2.9    32.1    +      -       -      -
     84A  ALA      2.8    23.4    +      -       -      -
     85A  PHE      3.8     2.5    -      -       -      -
     87A  ALA*     1.3    72.2    -      -       -      +
     89A  LEU*     1.3    62.7    +      -       -      +
     91A  ARG*     3.3     8.3    +      -       -      +
     92A  GLU*     3.1    26.5    +      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 89 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     39A  LYS*     4.0    20.0    -      -       +      -
     42A  GLN*     3.5    24.0    -      -       -      +
     85A  PHE*     3.0    54.7    +      -       +      +
     86A  ILE*     3.1     9.6    +      -       -      +
     88A  SER*     1.3    74.9    -      -       -      +
     90A  GLU*     1.3    66.2    +      -       -      +
     92A  GLU*     3.4    14.9    +      -       -      +
     93A  LEU*     3.3    17.8    +      -       -      +
    111A  PHE*     3.9    25.3    -      -       +      +
    114A  PHE*     4.8     8.5    -      -       +      -
----------------------------------------------------------
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Residues in contact with GLU 90 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     86A  ILE      2.9    13.1    +      -       -      +
     87A  ALA      3.4     7.4    -      -       -      +
     89A  LEU*     1.3    75.9    -      -       -      +
     91A  ARG*     1.3    54.8    +      -       -      +
     93A  LEU*     2.7    33.8    +      -       -      +
     94A  ILE*     2.9    40.1    +      -       +      +
     97A  LYS*     4.8     8.0    +      -       -      -
    111A  PHE*     3.0    30.7    -      -       +      -
    146A  ASP      5.7     0.2    -      -       -      +
    147A  ASN*     3.8    33.2    -      -       +      +
    149A  GLY*     3.7    20.2    -      -       -      -
----------------------------------------------------------
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Residues in contact with ARG 91 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     87A  ALA*     2.8    20.3    +      -       +      +
     88A  SER*     3.6     9.4    -      -       -      +
     89A  LEU      3.2     0.2    -      -       -      -
     90A  GLU*     1.3    72.1    -      -       -      +
     92A  GLU*     1.3    64.1    +      -       -      +
     93A  LEU      2.9     1.0    +      -       -      -
     94A  ILE*     3.0    24.6    +      -       +      +
     95A  LEU*     3.4    29.4    +      -       -      +
----------------------------------------------------------
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Residues in contact with GLU 92 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     39A  LYS*     2.9    41.9    +      -       -      +
     88A  SER*     3.1    15.1    +      -       -      +
     89A  LEU*     3.6    17.2    -      -       -      +
     91A  ARG*     1.3    75.6    -      -       -      +
     93A  LEU*     1.3    59.0    +      -       -      +
     95A  LEU*     4.1    12.8    -      -       -      +
     96A  ALA*     3.8    18.9    +      -       -      +
    103A  LEU*     4.9     8.6    -      -       +      +
    107A  GLU*     6.2     0.2    -      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 93 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     89A  LEU      3.3     8.9    +      -       -      +
     90A  GLU*     2.7    25.4    +      -       -      +
     92A  GLU*     1.3    74.7    -      -       -      +
     94A  ILE*     1.3    60.4    +      -       -      -
     96A  ALA*     3.9     5.3    -      -       +      +
     97A  LYS*     3.2    43.0    +      -       +      +
    103A  LEU*     6.1     4.5    -      -       +      -
    107A  GLU*     4.9     4.9    -      -       +      +
    108A  GLU*     3.8    51.4    -      -       +      +
    111A  PHE*     4.2    26.5    -      -       +      -
----------------------------------------------------------
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Residues in contact with ILE 94 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     90A  GLU*     2.9    43.9    +      -       +      +
     91A  ARG*     3.0    14.7    +      -       +      +
     93A  LEU*     1.3    74.5    -      -       -      +
     95A  LEU*     1.3    60.0    +      -       -      +
     96A  ALA      3.0     2.2    -      -       -      -
     97A  LYS*     2.7    39.8    +      -       +      +
     98A  LYS*     2.9    19.8    +      -       +      +
----------------------------------------------------------
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Residues in contact with LEU 95 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     91A  ARG*     3.4    29.4    +      -       -      +
     92A  GLU*     4.1    10.8    -      -       -      +
     94A  ILE*     1.3    78.3    -      -       -      +
     96A  ALA*     1.3    64.7    +      -       +      +
     98A  LYS*     3.4    19.5    +      -       -      +
     99A  GLN*     2.8    37.8    +      -       -      +
    100A  ASN*     5.7     2.9    -      -       +      +
----------------------------------------------------------
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Residues in contact with ALA 96 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     92A  GLU      3.8    14.9    +      -       -      +
     93A  LEU*     3.9     8.5    -      -       +      +
     94A  ILE      2.9     1.0    +      -       -      -
     95A  LEU*     1.3    85.9    -      -       +      +
     97A  LYS*     1.3    61.0    +      -       +      +
     98A  LYS      2.9     1.0    +      -       -      -
     99A  GLN      2.9     0.7    +      -       -      -
    100A  ASN*     2.4    47.5    +      -       -      +
    103A  LEU*     3.4    35.0    -      -       +      -
----------------------------------------------------------
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Residues in contact with LYS 97 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     90A  GLU*     4.8     9.7    +      -       -      -
     93A  LEU*     3.2    47.4    +      -       +      +
     94A  ILE*     2.7    21.5    +      -       +      +
     96A  ALA*     1.3    76.4    -      -       +      +
     98A  LYS*     1.3    61.7    +      -       -      +
     99A  GLN*     3.2     2.5    +      -       -      -
    100A  ASN      4.2     2.5    -      -       -      -
    101A  TYR*     5.7     3.6    -      -       -      -
    108A  GLU*     4.9    16.1    +      -       -      +
----------------------------------------------------------
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Residues in contact with LYS 98 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     94A  ILE*     2.9    23.7    +      -       +      +
     95A  LEU*     3.4    19.1    -      -       -      +
     96A  ALA      2.9     0.8    +      -       -      -
     97A  LYS*     1.3    78.2    -      -       -      +
     99A  GLN*     1.3    76.2    +      -       -      +
----------------------------------------------------------
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Residues in contact with GLN 99 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     95A  LEU*     2.8    26.7    +      -       -      +
     96A  ALA      2.9     0.8    +      -       -      -
     97A  LYS      3.2     2.2    -      -       -      -
     98A  LYS*     1.3    90.4    -      -       -      +
    100A  ASN*     1.3    83.4    +      -       +      +
    101A  TYR*     3.6    12.4    +      -       -      +
----------------------------------------------------------
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A short description of the analytical approach
The contact analysis used in this page is based upon the approach developed in: Sobolev V., Wade R.C., Vriend G. and Edelman M. PROTEINS (1996) 25, 120-129. Contact legitimacy depends on the hydrophobic-hydrophilic properties of the contacting atoms. In order to define it, for each inter-atomic contact, eight atom classes have been introduced:


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

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

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