Contacts of the helix formed by residues 109 - 133 (chain C) in PDB entry 2FYU


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 PHE 109 (chain C).
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    106C  SER      3.2    15.1    +      -       -      +
    107C  TYR      3.2     2.6    -      -       -      -
    108C  THR*     1.3    74.5    +      -       -      +
    110C  LEU*     1.3    64.9    +      -       -      +
    111C  GLU*     3.3     3.9    +      -       -      -
    112C  THR*     3.3    18.0    +      -       -      +
    113C  TRP*     3.0    22.2    +      -       -      +
    200C  LEU*     3.9    16.4    -      -       +      -
    203C  THR*     3.3    32.8    -      -       +      -
    204C  GLY      3.2    26.5    -      -       -      -
    205C  SER      4.2     1.3    -      -       -      -
    206C  ASN*     3.6    17.3    -      -       +      -
    313C  ARG*     3.3    34.1    -      -       -      -
    382C  HEM      3.9    13.7    -      -       +      -
----------------------------------------------------------
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Residues in contact with LEU 110 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    107C  TYR      4.0    10.3    -      -       -      +
    108C  THR*     3.1    15.2    +      -       -      +
    109C  PHE*     1.3    69.7    -      -       -      +
    111C  GLU*     1.3    65.8    +      -       +      +
    113C  TRP*     3.5     3.2    -      -       -      +
    114C  ASN*     2.8    48.4    +      -       -      +
    305C  PRO*     4.6    22.2    -      -       +      +
    306C  LEU*     6.3     2.7    -      -       +      -
----------------------------------------------------------
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Residues in contact with GLU 111 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    109C  PHE*     3.4     1.2    -      -       -      -
    110C  LEU*     1.3    87.6    +      -       +      +
    112C  THR*     1.3    65.6    +      -       -      +
    114C  ASN*     3.5     4.9    +      -       -      +
    115C  ILE*     3.1    32.7    +      -       +      +
    199C  PHE*     3.7    47.2    -      -       +      +
    202C  GLU*     5.9     1.4    -      -       -      +
----------------------------------------------------------
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Residues in contact with THR 112 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    109C  PHE*     3.6    19.4    -      -       +      +
    111C  GLU*     1.3    78.6    -      -       -      +
    113C  TRP*     1.3    60.3    +      -       -      +
    115C  ILE*     3.5     1.1    +      -       -      -
    116C  GLY      3.1     4.9    +      -       -      -
    196C  HIS*     2.9    40.7    +      -       +      +
    199C  PHE*     3.3    12.0    +      -       -      +
    200C  LEU*     3.2    43.5    +      -       +      -
    382C  HEM      3.7    34.5    -      -       +      -
----------------------------------------------------------
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Residues in contact with TRP 113 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     97C  HIS      5.6     0.2    -      -       -      -
     98C  VAL*     4.2    16.8    -      -       +      -
    101C  GLY*     4.0    21.1    -      -       -      -
    102C  LEU*     4.2    15.7    -      -       +      -
    107C  TYR*     3.5    36.6    -      +       +      +
    109C  PHE      3.0    17.1    +      -       -      +
    110C  LEU      3.5     3.6    -      -       -      +
    112C  THR*     1.3    78.6    -      -       -      +
    114C  ASN*     1.3    68.0    +      -       -      +
    116C  GLY*     3.0    16.3    +      -       -      -
    117C  VAL*     3.1    20.2    +      -       +      +
    301C  LEU*     2.8    49.5    +      -       +      -
    304C  ILE*     4.6     7.4    -      -       +      -
    305C  PRO*     3.8    17.7    -      -       +      +
    382C  HEM      3.5    53.6    -      -       +      +
----------------------------------------------------------
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Residues in contact with ASN 114 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    110C  LEU*     2.8    32.3    +      -       +      +
    111C  GLU*     3.5     6.3    +      -       -      +
    113C  TRP*     1.3    81.4    -      -       -      +
    115C  ILE*     1.3    61.7    +      -       +      +
    117C  VAL*     3.6     8.6    -      -       -      +
    118C  ILE*     3.4    26.3    +      -       -      +
    302C  ALA*     4.2    33.2    +      -       -      +
    305C  PRO*     5.5     1.0    -      -       -      +
----------------------------------------------------------
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Residues in contact with ILE 115 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    111C  GLU*     3.1    22.7    +      -       -      +
    112C  THR      3.7     3.1    -      -       -      +
    114C  ASN*     1.3    74.6    -      -       +      +
    116C  GLY*     1.3    52.9    +      -       -      +
    117C  VAL      3.3     0.2    -      -       -      -
    118C  ILE*     3.1    14.4    +      -       +      +
    119C  LEU*     2.8    33.1    +      -       +      +
    192C  ILE*     3.7    27.3    -      -       +      +
    195C  VAL*     4.5    13.9    -      -       +      -
    196C  HIS*     3.6    35.4    -      -       +      +
    199C  PHE*     4.5    17.5    -      -       +      -
----------------------------------------------------------
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Residues in contact with GLY 116 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    112C  THR      3.1     7.3    +      -       -      -
    113C  TRP      3.0     9.3    +      -       -      -
    115C  ILE*     1.3    75.9    -      -       -      +
    117C  VAL*     1.3    50.2    +      -       -      +
    119C  LEU*     3.2     5.7    +      -       -      +
    120C  LEU      2.8    29.3    +      -       -      -
    196C  HIS*     3.8    12.0    +      -       -      -
    382C  HEM      3.1    39.4    -      -       -      +
----------------------------------------------------------
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Residues in contact with VAL 117 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    113C  TRP*     3.1    29.5    +      -       +      +
    114C  ASN*     3.6    13.0    -      -       -      +
    116C  GLY*     1.3    71.7    -      -       -      +
    118C  ILE*     1.3    62.3    +      -       +      +
    120C  LEU*     3.0    10.0    +      -       +      +
    121C  LEU*     2.9    45.0    +      -       +      +
    298C  ILE*     5.2     7.9    -      -       +      +
    299C  LEU*     5.1     8.3    -      -       +      -
    301C  LEU*     4.1    18.4    -      -       +      -
    302C  ALA*     4.3    20.2    -      -       +      +
    382C  HEM      3.7    13.7    -      -       +      -
----------------------------------------------------------
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Residues in contact with ILE 118 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    114C  ASN*     3.4    16.4    +      -       -      +
    115C  ILE*     3.1    18.5    +      -       +      +
    117C  VAL*     1.3    74.3    -      -       +      +
    119C  LEU*     1.3    56.7    +      -       -      +
    121C  LEU*     3.2    21.6    +      -       +      +
    122C  THR*     2.6    42.9    +      -       -      +
    192C  ILE*     4.0    26.9    -      -       +      -
----------------------------------------------------------
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Residues in contact with LEU 119 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     94C  LEU*     5.3     0.2    -      -       -      -
    115C  ILE*     2.8    20.5    +      -       +      +
    116C  GLY*     3.2     8.5    +      -       -      +
    118C  ILE*     1.3    71.6    -      -       -      +
    120C  LEU*     1.3    55.2    +      -       -      +
    122C  THR*     3.3     4.3    +      -       -      -
    123C  VAL*     3.0    35.9    +      -       -      +
    189C  ILE*     3.6    34.1    -      -       +      +
    192C  ILE*     3.8    13.5    -      -       +      -
    193C  ALA*     3.8    11.2    -      -       -      +
    196C  HIS*     3.8    36.3    -      -       +      +
    382C  HEM      3.6    46.9    -      -       +      -
----------------------------------------------------------
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Residues in contact with LEU 120 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     91C  PHE*     4.5     1.1    -      -       +      -
     94C  LEU*     3.7    32.5    -      -       +      -
     95C  TYR*     4.3    20.4    -      -       +      -
     98C  VAL*     4.7    11.0    -      -       +      -
    116C  GLY      2.8    15.6    +      -       -      +
    117C  VAL*     3.0     9.6    +      -       +      +
    119C  LEU*     1.3    72.7    -      -       -      +
    121C  LEU*     1.3    56.0    +      -       -      +
    123C  VAL*     3.4     3.0    +      -       -      +
    124C  MET*     3.1    51.3    +      -       +      +
    298C  ILE*     4.1    17.7    -      -       +      -
    301C  LEU*     3.8    29.4    -      -       +      -
    382C  HEM      3.9    10.2    -      -       +      +
----------------------------------------------------------
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Residues in contact with LEU 121 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    117C  VAL*     2.9    33.9    +      -       +      +
    118C  ILE*     3.7    20.4    -      -       +      +
    120C  LEU*     1.3    71.8    -      -       -      +
    122C  THR*     1.3    56.8    +      -       -      +
    124C  MET*     3.8    11.8    -      -       +      +
    125C  ALA*     3.2    26.9    +      -       -      +
    298C  ILE*     3.9    28.0    -      -       +      -
    299C  LEU*     4.1    28.3    -      -       +      -
----------------------------------------------------------
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Residues in contact with THR 122 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    118C  ILE*     2.6    35.5    +      -       -      +
    119C  LEU*     3.6     5.6    -      -       -      -
    121C  LEU*     1.3    75.4    -      -       -      +
    123C  VAL*     1.3    55.4    +      -       -      +
    125C  ALA*     3.7     4.9    +      -       +      +
    126C  THR*     2.7    35.6    +      -       -      -
    185C  LEU*     3.7    28.0    -      -       +      +
    188C  ILE*     4.9     9.4    -      -       +      -
    189C  ILE*     3.7    23.6    -      -       +      -
    192C  ILE*     4.6     6.7    -      -       +      +
----------------------------------------------------------
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Residues in contact with VAL 123 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     90C  PHE*     3.8    39.7    -      -       +      -
     91C  PHE*     4.0    13.7    -      -       +      -
     94C  LEU*     3.7    27.1    -      -       +      -
    119C  LEU      3.0    27.3    +      -       -      +
    120C  LEU      4.7     0.2    -      -       -      +
    122C  THR*     1.3    72.4    -      -       -      +
    124C  MET*     1.3    56.4    +      -       -      +
    126C  THR*     3.2     7.1    +      -       -      -
    127C  ALA*     2.8    34.1    +      -       -      +
    189C  ILE*     4.1    14.1    -      -       +      -
    381C  HEM      4.5     7.8    -      -       +      +
    382C  HEM      4.3    10.3    -      -       +      -
----------------------------------------------------------
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Residues in contact with MET 124 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     91C  PHE*     3.7    25.8    -      -       +      -
     95C  TYR*     5.4     4.7    -      -       -      +
    120C  LEU*     3.1    38.9    +      -       +      +
    121C  LEU*     3.8    11.2    -      -       +      +
    123C  VAL*     1.3    75.6    -      -       -      +
    125C  ALA*     1.3    56.2    +      -       -      +
    128C  PHE*     3.0    27.3    +      -       -      +
    274C  PHE*     4.0    15.5    -      -       +      -
    298C  ILE*     3.8    41.1    -      -       +      -
    400C  FDN      3.3    42.1    -      -       -      -
----------------------------------------------------------
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Residues in contact with ALA 125 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    121C  LEU      3.2    17.5    +      -       -      +
    122C  THR*     3.9     6.5    -      -       -      +
    124C  MET*     1.3    76.3    -      -       -      +
    126C  THR*     1.3    63.7    +      -       -      +
    128C  PHE*     3.6     9.5    +      -       +      +
    129C  MET*     3.2    32.9    +      -       +      +
    185C  LEU*     4.4    16.2    -      -       +      -
----------------------------------------------------------
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Residues in contact with THR 126 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    122C  THR      2.7    23.0    +      -       -      -
    123C  VAL*     3.2     9.4    +      -       -      -
    125C  ALA*     1.3    77.5    -      -       -      +
    127C  ALA*     1.3    56.4    +      -       -      +
    129C  MET*     3.3     1.8    +      -       -      -
    130C  GLY      3.1     9.0    +      -       -      -
    182C  HIS*     2.7    35.5    +      -       +      +
    185C  LEU*     3.4    18.4    -      -       +      +
    186C  PRO*     3.7    20.4    -      -       +      -
    189C  ILE*     3.3    12.2    -      -       +      +
    381C  HEM      3.6    33.4    -      -       +      -
----------------------------------------------------------
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Residues in contact with ALA 127 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     87C  ALA*     5.2     1.1    -      -       +      -
     91C  PHE*     3.6    24.7    -      -       +      -
    123C  VAL      2.8    19.4    +      -       -      +
    124C  MET      4.1     1.8    -      -       -      +
    126C  THR*     1.3    71.3    -      -       -      +
    128C  PHE*     1.3    64.9    +      -       -      +
    130C  GLY      4.0     0.2    -      -       -      -
    131C  TYR*     3.2    24.1    +      -       -      +
    273C  TYR*     3.9    11.4    -      -       -      +
    381C  HEM      3.9    31.6    -      -       +      +
    400C  FDN      4.0     5.7    -      -       +      +
----------------------------------------------------------
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Residues in contact with PHE 128 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    124C  MET      3.0    18.2    +      -       -      +
    125C  ALA*     3.7     8.3    -      -       +      +
    127C  ALA*     1.3    75.1    -      -       -      +
    129C  MET*     1.3    74.6    +      -       +      +
    131C  TYR*     3.3    13.2    +      -       -      +
    132C  VAL*     3.4    24.1    +      -       +      +
    142C  GLY      3.9     2.2    -      -       -      -
    143C  ALA*     3.8    18.2    -      -       -      -
    146C  ILE*     3.6    44.6    -      -       +      -
    147C  THR*     3.9    13.7    -      -       +      -
    164C  ILE*     5.8     1.1    -      -       +      -
    178C  PHE*     3.5    35.2    -      +       -      -
    400C  FDN      3.5    38.1    -      -       +      -
----------------------------------------------------------
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Residues in contact with MET 129 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    125C  ALA*     3.2    20.9    +      -       +      +
    126C  THR*     3.3     3.8    +      -       -      +
    128C  PHE*     1.3    87.2    -      -       +      +
    130C  GLY*     1.3    60.9    +      -       -      +
    132C  VAL*     3.5    11.8    -      -       -      +
    133C  LEU*     3.4    20.8    -      -       -      +
    164C  ILE*     5.1     5.6    -      -       +      -
    178C  PHE*     3.6    56.4    -      -       +      +
    181C  PHE*     3.6    39.9    -      -       +      -
    182C  HIS*     4.0     7.2    -      -       +      +
    185C  LEU*     4.6    12.8    -      -       +      -
----------------------------------------------------------
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Residues in contact with GLY 130 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    126C  THR      3.1    10.7    +      -       -      -
    127C  ALA      3.8     1.1    +      -       -      -
    129C  MET*     1.3    73.6    -      -       -      +
    131C  TYR*     1.3    58.2    -      -       -      +
    133C  LEU*     3.0    29.4    +      -       -      +
    134C  PRO*     3.5     1.0    -      -       -      +
    182C  HIS*     3.2    29.4    +      -       -      -
    381C  HEM      3.4    22.0    -      -       -      +
----------------------------------------------------------
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Residues in contact with TYR 131 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    127C  ALA      3.2    19.2    +      -       -      +
    128C  PHE      3.3     4.7    +      -       -      +
    130C  GLY*     1.3    70.8    -      -       -      +
    132C  VAL*     1.3    55.5    +      -       -      +
    134C  PRO*     3.4     8.8    -      -       -      +
    138C  MET*     3.7    34.7    -      -       +      +
    139C  SER*     2.6    35.7    +      -       -      -
    251C  GLY*     5.9     1.3    -      -       -      -
    252C  ASP*     3.9    14.7    +      -       -      +
    255C  ASN*     3.9    17.4    -      -       +      +
    269C  LYS      5.6     1.0    +      -       -      -
    271C  GLU*     3.3    36.7    +      -       +      -
    381C  HEM      3.7    33.0    -      -       +      -
    400C  FDN      3.6    44.6    -      +       +      -
----------------------------------------------------------
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Residues in contact with VAL 132 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    128C  PHE*     3.4    24.2    -      -       +      +
    129C  MET      3.5     8.7    -      -       -      +
    131C  TYR*     1.3    75.1    -      -       -      +
    133C  LEU*     1.3    63.7    +      -       -      +
    135C  TRP*     3.1    44.6    +      -       +      -
    139C  SER*     3.3    16.7    -      -       -      +
    143C  ALA*     3.7    24.9    -      -       +      +
    170C  VAL*     5.2     1.3    -      -       +      -
    174C  THR*     5.8     0.4    -      -       +      -
    175C  LEU*     4.5     7.4    -      -       +      -
    178C  PHE*     3.7    34.5    -      -       +      -
    400C  FDN      4.8     2.0    -      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 133 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     55C  TYR*     2.6    37.0    +      -       +      +
     62C  ALA*     3.7     3.5    -      -       -      +
    129C  MET      3.4    19.1    -      -       -      +
    130C  GLY*     3.0    13.8    +      -       -      +
    132C  VAL*     1.3    73.6    -      -       -      +
    134C  PRO*     1.4    60.9    -      -       +      +
    135C  TRP      3.2     1.6    +      -       -      -
    175C  LEU*     3.5    20.9    -      -       +      +
    178C  PHE*     3.7     5.6    -      -       +      -
    179C  PHE*     3.4    54.3    -      -       +      +
    182C  HIS*     3.8    22.7    -      -       +      -
    381C  HEM      3.8    25.8    -      -       +      -
----------------------------------------------------------
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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