Contacts of the helix formed by residues 90 - 116 (chain A) in PDB entry 4LZ6


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 90 (chain A).
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
      3A  GLN*     3.0    14.8    -      -       -      +
      4A  LYS*     3.2    30.7    -      -       -      +
     84A  ARG      4.5     2.6    +      -       -      -
     85A  LEU*     4.2    19.4    -      -       -      +
     88A  ARG*     1.9    27.5    +      -       -      -
     89A  ARG*     1.3    57.8    -      -       -      +
     91A  GLU*     1.3    56.2    +      -       -      -
     92A  GLU      3.8     0.2    -      -       -      -
     93A  ALA*     4.0     5.7    -      -       -      +
    225A  SER*     3.4    12.3    +      -       -      -
----------------------------------------------------------
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Residues in contact with GLU 91 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
      3A  GLN*     3.3    17.0    -      -       +      +
      4A  LYS*     3.3    32.8    -      -       -      +
     89A  ARG      2.2    18.3    +      -       -      +
     90A  GLY*     1.3    68.4    -      -       -      -
     92A  GLU*     1.3    64.2    +      -       -      +
     93A  ALA      3.1     1.3    -      -       -      -
     94A  ASN*     3.4    23.0    +      -       +      +
     95A  GLN*     3.0    21.5    +      -       -      +
----------------------------------------------------------
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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
----------------------------------------------------------
     84A  ARG*     3.5    39.6    -      -       +      +
     89A  ARG*     2.5    42.3    +      -       +      +
     91A  GLU*     1.3    71.8    -      -       -      +
     93A  ALA*     1.3    64.1    +      -       -      +
     95A  GLN*     3.0    25.2    -      -       -      +
     96A  VAL*     2.8    20.2    +      -       +      +
    237A  VAL*     3.6    16.5    -      -       -      +
----------------------------------------------------------
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Residues in contact with ALA 93 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     80A  VAL*     6.0     0.4    -      -       -      +
     81A  ILE*     3.7    32.1    -      -       +      +
     84A  ARG*     4.1    19.1    +      -       -      +
     85A  LEU*     4.7    10.8    -      -       +      -
     89A  ARG      3.9     0.8    +      -       -      -
     90A  GLY      4.0    10.8    -      -       -      +
     92A  GLU*     1.3    70.7    -      -       -      +
     94A  ASN*     1.3    71.0    +      -       -      +
     95A  GLN      2.5     3.8    +      -       -      -
     96A  VAL*     2.6    17.7    +      -       -      +
     97A  PHE*     3.5     5.9    +      -       -      -
    225A  SER*     3.1    13.0    -      -       -      +
----------------------------------------------------------
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Residues in contact with ASN 94 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
      4A  LYS*     5.2     4.1    -      -       -      +
     91A  GLU*     3.4    35.0    +      -       +      +
     93A  ALA*     1.3    68.8    -      -       -      +
     95A  GLN*     1.3    60.5    +      -       -      +
     97A  PHE*     3.8     9.2    -      -       -      +
    225A  SER*     2.4    39.2    +      -       -      +
    226A  LEU      2.6    29.4    +      -       -      -
    227A  HIS*     3.0    39.7    +      -       -      +
    231A  LEU*     2.9    30.6    -      -       +      +
----------------------------------------------------------
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Residues in contact with GLN 95 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     91A  GLU      3.0    12.3    +      -       -      +
     92A  GLU*     3.0    28.3    -      -       -      +
     93A  ALA      2.5     7.9    +      -       -      -
     94A  ASN*     1.3    72.5    -      -       -      +
     96A  VAL*     1.3    69.0    +      -       +      +
     98A  GLY*     3.4     1.6    +      -       -      -
     99A  ASN*     3.1    29.5    +      -       -      +
    231A  LEU*     3.3    31.8    +      -       +      +
    232A  ARG*     4.0     7.3    -      -       -      +
    233A  MET      4.6     3.0    -      -       -      +
    235A  GLY*     4.7    10.5    -      -       -      -
    237A  VAL*     5.2     3.3    -      -       +      +
----------------------------------------------------------
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Residues in contact with VAL 96 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     77A  GLY*     4.4     7.9    -      -       -      -
     80A  VAL*     3.6    28.5    -      -       +      -
     81A  ILE*     3.6    18.4    -      -       +      -
     84A  ARG*     4.4     0.9    -      -       -      +
     92A  GLU*     2.8    18.7    +      -       -      +
     93A  ALA*     2.6    11.5    +      -       -      +
     95A  GLN*     1.3    66.5    -      -       -      +
     97A  PHE*     1.3    61.7    +      -       -      +
     99A  ASN*     2.4    36.5    +      -       -      +
    100A  ILE*     2.9    26.5    +      -       +      -
    237A  VAL*     3.2    33.9    -      -       +      -
    241A  VAL*     4.8     0.7    -      -       +      -
----------------------------------------------------------
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Residues in contact with PHE 97 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     81A  ILE*     3.8    10.6    -      -       +      +
     93A  ALA      3.5     5.4    +      -       -      +
     94A  ASN      3.8    12.3    -      -       -      +
     96A  VAL*     1.3    84.9    -      -       -      +
     98A  GLY*     1.3    63.5    +      -       -      +
    100A  ILE*     3.0    16.3    +      -       -      +
    101A  LEU*     3.0    45.2    -      -       +      +
    152A  PHE*     5.5     4.5    -      +       -      -
    159A  ILE*     3.7    25.1    -      -       +      -
    217A  PHE*     2.8    66.2    -      +       +      -
    225A  SER      4.1     6.5    -      -       -      +
    226A  LEU*     3.9    18.2    -      -       +      -
    228A  TRP*     5.8     7.4    -      +       -      -
    231A  LEU*     5.7     1.6    -      -       +      -
----------------------------------------------------------
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Residues in contact with GLY 98 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     94A  ASN      3.9     2.4    +      -       -      -
     95A  GLN      3.4     3.9    +      -       -      -
     96A  VAL      2.8     4.0    +      -       -      -
     97A  PHE*     1.3    80.5    -      -       -      +
     99A  ASN*     1.3    54.6    +      -       -      +
    100A  ILE      2.9     4.9    -      -       -      -
    101A  LEU*     2.9    31.3    +      -       -      +
    102A  THR*     3.1    10.2    +      -       -      +
    231A  LEU*     4.5     8.8    -      -       -      +
    232A  ARG*     3.1    23.9    -      -       -      +
----------------------------------------------------------
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Residues in contact with ASN 99 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     95A  GLN*     3.1    22.3    +      -       -      +
     96A  VAL*     2.4    49.0    +      -       -      +
     98A  GLY*     1.3    68.6    -      -       -      +
    100A  ILE*     1.3    55.4    +      -       -      +
    102A  THR*     2.6    28.7    +      -       +      -
    103A  VAL*     3.8     5.9    -      -       -      +
    232A  ARG*     3.3     6.7    -      -       +      +
    233A  MET      4.9     0.7    -      -       -      +
    234A  LYS      4.9     0.4    -      -       -      -
    235A  GLY*     3.8    20.8    -      -       -      +
    237A  VAL*     3.5     9.1    -      -       -      +
    238A  ILE*     3.6    34.0    -      -       -      +
----------------------------------------------------------
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Residues in contact with ILE 100 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     73A  LEU*     3.5    37.5    -      -       +      +
     74A  GLY*     5.5     0.4    -      -       -      -
     77A  GLY*     5.0     3.6    -      -       -      -
     96A  VAL*     3.3    26.7    -      -       +      +
     97A  PHE*     3.1    14.6    -      -       -      +
     98A  GLY      2.9     0.2    -      -       -      -
     99A  ASN*     1.3    89.9    -      -       -      +
    101A  LEU*     1.3    58.0    +      -       +      +
    102A  THR      2.6    15.4    +      -       -      -
    103A  VAL*     2.7    20.5    +      -       +      +
    104A  ILE*     3.0    28.8    +      -       +      +
    155A  ALA*     5.8     0.9    -      -       +      -
    159A  ILE*     6.5     0.9    -      -       +      -
    237A  VAL*     5.0     0.4    -      -       +      -
    238A  ILE*     5.9     0.4    -      -       -      -
    241A  VAL*     3.6    33.2    -      -       +      -
----------------------------------------------------------
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Residues in contact with LEU 101 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     97A  PHE*     3.0    51.8    -      -       +      +
     98A  GLY*     2.9    15.2    +      -       -      +
    100A  ILE*     1.3    77.5    -      -       +      +
    102A  THR*     1.3    62.2    +      -       -      +
    104A  ILE*     3.5    19.3    -      -       +      +
    105A  LEU*     2.9    44.5    +      -       +      +
    152A  PHE*     3.5    39.5    -      -       +      -
    155A  ALA*     5.3     5.8    -      -       +      -
    159A  ILE*     6.1     2.5    -      -       +      -
    228A  TRP*     5.5    13.2    -      -       +      +
    232A  ARG*     5.3     4.3    -      -       +      -
----------------------------------------------------------
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Residues in contact with THR 102 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     98A  GLY      3.1    13.2    +      -       -      +
     99A  ASN*     2.6    30.3    +      -       +      -
    100A  ILE      2.6     3.8    +      -       -      -
    101A  LEU*     1.3    74.8    -      -       -      +
    103A  VAL*     1.3    79.4    +      -       -      +
    105A  LEU*     3.5     3.0    -      -       -      +
    106A  VAL*     2.7    30.4    +      -       -      +
    232A  ARG*     3.7    20.0    -      -       -      +
    233A  MET      3.0    28.7    -      -       -      +
    234A  LYS*     4.7     3.1    -      -       -      -
    238A  ILE*     4.3     6.6    -      -       -      +
----------------------------------------------------------
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Residues in contact with VAL 103 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     73A  LEU*     3.6    41.7    -      -       +      -
     99A  ASN      3.8     8.5    -      -       -      +
    100A  ILE*     2.7    12.4    +      -       +      +
    102A  THR*     1.3    92.8    +      -       -      +
    104A  ILE*     1.3    64.0    +      -       -      +
    106A  VAL*     2.9    16.5    -      -       +      +
    107A  LEU*     2.8    29.6    +      -       +      +
    238A  ILE*     4.3    24.9    -      -       +      -
    242A  CYS*     5.7     2.5    -      -       -      -
----------------------------------------------------------
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Residues in contact with ILE 104 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     70A  ALA*     5.2     6.1    -      -       +      +
     73A  LEU*     4.4    12.5    -      -       +      +
    100A  ILE*     3.0    36.7    +      -       +      +
    101A  LEU*     3.5    22.4    -      -       +      +
    102A  THR      2.9     0.8    +      -       -      -
    103A  VAL*     1.3    72.7    -      -       -      +
    105A  LEU*     1.3    60.0    +      -       +      +
    106A  VAL      2.7     0.3    +      -       -      -
    107A  LEU*     2.5    32.9    +      -       -      +
    108A  SER*     2.7    20.6    +      -       -      +
    151A  PHE*     3.8    29.8    -      -       +      -
    152A  PHE*     4.1    13.2    -      -       +      +
    155A  ALA*     3.8    26.0    -      -       +      -
----------------------------------------------------------
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Residues in contact with LEU 105 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    101A  LEU*     2.9    49.5    +      -       +      +
    102A  THR*     3.8     2.5    -      -       -      +
    104A  ILE*     1.3    83.1    -      -       +      +
    106A  VAL*     1.3    61.7    +      -       -      +
    108A  SER*     3.7    18.9    -      -       -      +
    109A  VAL*     4.1    10.4    +      -       -      +
    148A  ILE*     6.3     3.6    -      -       +      -
    152A  PHE*     5.2     5.2    -      -       +      -
    228A  TRP*     6.5     2.5    -      -       +      -
----------------------------------------------------------
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Residues in contact with VAL 106 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    102A  THR*     2.7    24.3    +      -       -      +
    103A  VAL*     2.9    25.4    -      -       +      +
    104A  ILE      2.7     3.8    +      -       -      -
    105A  LEU*     1.3    72.9    -      -       -      +
    107A  LEU*     1.3    67.8    +      -       +      +
    109A  VAL*     3.2    12.8    +      -       -      +
    110A  ILE*     3.1    30.0    +      -       +      +
----------------------------------------------------------
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Residues in contact with LEU 107 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     69A  MET*     3.9    32.1    -      -       +      -
     70A  ALA*     5.6     1.1    -      -       +      +
     73A  LEU*     4.1    15.5    -      -       +      -
    103A  VAL*     2.8    20.3    +      -       +      +
    104A  ILE*     2.5    14.4    +      -       -      +
    106A  VAL*     1.3    73.9    -      -       +      +
    108A  SER*     1.3    52.4    +      -       -      +
    109A  VAL      2.3    20.5    +      -       -      -
    110A  ILE*     2.4    46.6    +      -       +      +
    111A  GLY*     3.0     9.5    +      -       -      -
    151A  PHE*     4.4    17.5    -      -       +      -
----------------------------------------------------------
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Residues in contact with SER 108 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    104A  ILE*     2.7    25.0    +      -       -      +
    105A  LEU*     3.7    17.1    -      -       -      +
    107A  LEU*     1.3    68.8    -      -       -      +
    109A  VAL*     1.3    57.3    +      -       -      +
    111A  GLY      4.3     0.2    -      -       -      -
    112A  PHE*     3.6    12.6    +      -       -      +
    147A  SER*     3.6    16.9    -      -       -      -
    148A  ILE*     3.0    45.2    +      -       -      +
    151A  PHE*     3.5    22.5    -      -       -      -
    152A  PHE*     6.0     0.2    -      -       -      +
----------------------------------------------------------
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Residues in contact with VAL 109 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    105A  LEU      4.1     9.0    -      -       -      +
    106A  VAL      3.2    11.6    +      -       -      +
    107A  LEU      2.3    14.1    +      -       -      -
    108A  SER*     1.3    72.3    -      -       -      +
    110A  ILE*     1.3    58.5    +      -       +      +
    111A  GLY      2.9     4.9    -      -       -      -
    112A  PHE*     2.7    13.6    +      -       +      -
    113A  ILE*     2.6    56.0    +      -       +      +
    148A  ILE*     6.2     0.9    -      -       +      -
----------------------------------------------------------
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Residues in contact with ILE 110 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    106A  VAL*     3.1    47.3    -      -       +      +
    107A  LEU*     2.4    39.9    +      -       +      +
    109A  VAL*     1.3    76.8    -      -       +      +
    111A  GLY*     1.3    55.8    +      -       -      +
    113A  ILE*     3.5    15.4    -      -       +      +
    114A  SER*     2.8    28.2    +      -       -      +
----------------------------------------------------------
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Residues in contact with GLY 111 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    107A  LEU      3.0     8.0    +      -       -      -
    109A  VAL      2.8     1.4    +      -       -      -
    110A  ILE*     1.3    74.7    -      -       -      +
    112A  PHE*     1.3    57.6    +      -       -      +
    113A  ILE      3.2     1.1    -      -       -      -
    114A  SER*     2.8    12.5    +      -       -      -
    115A  ALA*     2.8    29.5    +      -       -      +
    144A  LEU*     3.0    13.0    -      -       -      +
    147A  SER*     3.7    17.5    -      -       -      -
    151A  PHE*     5.7     3.8    -      -       -      -
----------------------------------------------------------
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Residues in contact with PHE 112 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    108A  SER      3.6    17.2    +      -       -      +
    109A  VAL*     2.7    18.4    +      -       +      +
    111A  GLY*     1.3    75.3    -      -       -      +
    113A  ILE*     1.3    68.8    +      -       +      +
    115A  ALA*     3.5    12.2    -      -       -      +
    116A  PHE*     3.7    10.0    +      -       +      +
    144A  LEU      4.0     7.4    -      -       -      +
    145A  LEU*     2.8    42.3    -      -       +      +
    147A  SER*     3.7     1.0    +      -       -      -
    148A  ILE*     5.6     3.8    -      -       +      -
----------------------------------------------------------
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Residues in contact with ILE 113 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    109A  VAL*     2.6    42.6    +      -       +      +
    110A  ILE*     3.5    17.0    -      -       +      +
    112A  PHE*     1.3    76.1    -      -       +      +
    114A  SER*     1.3    55.5    +      -       -      +
    115A  ALA      2.8    12.9    +      -       -      -
    116A  PHE*     2.9    15.7    +      -       -      +
    117A  THR*     3.1    23.0    +      -       +      +
    118A  LEU*     5.9     2.2    -      -       +      -
----------------------------------------------------------
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Residues in contact with SER 114 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    110A  ILE*     2.8    17.9    +      -       -      +
    111A  GLY*     2.8    30.3    +      -       -      -
    113A  ILE*     1.3    70.4    -      -       -      +
    115A  ALA*     1.3    60.6    +      -       -      +
    117A  THR*     3.4    12.6    -      -       -      -
    118A  LEU*     2.9    42.2    +      -       -      -
    119A  LEU*     3.2     9.2    +      -       -      -
    144A  LEU*     3.2    11.5    -      -       -      +
----------------------------------------------------------
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Residues in contact with ALA 115 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    111A  GLY      2.8    21.2    +      -       -      +
    112A  PHE*     3.5     9.0    -      -       -      +
    113A  ILE      2.8     2.8    +      -       -      -
    114A  SER*     1.3    69.7    -      -       -      +
    116A  PHE*     1.3    55.3    +      -       -      +
    117A  THR      2.7    13.7    +      -       -      +
    119A  LEU*     3.2    30.4    -      -       +      +
    141A  PHE*     4.1    12.4    -      -       +      +
    144A  LEU*     3.6    24.7    -      -       +      -
    145A  LEU*     4.2    19.7    -      -       +      -
----------------------------------------------------------
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Residues in contact with PHE 116 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    112A  PHE*     4.0     9.2    -      -       +      +
    113A  ILE*     2.9    11.2    +      -       -      +
    115A  ALA*     1.3    73.0    -      -       -      +
    117A  THR*     1.3    62.0    +      -       -      +
    141A  PHE*     4.3    18.9    -      +       +      -
----------------------------------------------------------
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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