Contacts of the helix formed by residues 86 - 111 (chain H) in PDB entry 1GUM


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 LEU 86 (chain H).
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     74G  TYR*     3.8    28.7    -      -       +      -
     77G  ASP*     4.2    29.8    -      -       +      +
     78G  LYS*     4.0    21.1    -      -       +      +
     85H  ASN*     1.3    75.9    +      -       -      +
     87H  LYS*     1.3    61.3    +      -       -      +
     89H  ARG*     3.2    16.5    -      -       +      +
     90H  THR*     2.5    53.0    +      -       -      +
----------------------------------------------------------
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Residues in contact with LYS 87 (chain H). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     61G  ASP*     4.8     4.8    +      -       -      +
     63G  MET*     3.6    29.0    -      -       +      +
     74G  TYR*     3.2    34.5    +      -       -      -
     78G  LYS*     5.6     3.9    -      -       -      +
     85H  ASN*     2.7    15.8    +      -       -      +
     86H  LEU*     1.3    85.0    -      -       +      +
     88H  GLU*     1.3    66.4    +      -       +      +
     90H  THR*     3.4     3.7    +      -       -      +
     91H  LEU*     3.1    28.3    +      -       +      +
----------------------------------------------------------
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Residues in contact with GLU 88 (chain H). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     83H  GLY*     3.6     9.2    -      -       -      -
     84H  LYS*     3.0    37.1    +      -       -      +
     85H  ASN*     3.0    35.6    +      -       -      +
     87H  LYS*     1.3    75.5    -      -       +      +
     89H  ARG*     1.3    55.2    +      -       -      +
     91H  LEU*     2.7    30.4    +      -       +      +
     92H  ILE*     3.0    15.7    +      -       -      +
    149H  VAL*     4.0    18.5    -      -       +      +
    150H  GLY*     4.1    25.0    -      -       -      +
    152H  GLN*     5.2     2.1    +      -       -      -
----------------------------------------------------------
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Residues in contact with ARG 89 (chain H). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     77G  ASP*     4.6     2.2    +      -       -      -
     89G  ARG*     3.1    38.5    -      -       -      +
     73H  HIS*     5.1     4.6    +      -       -      +
     77H  ASP*     3.0    42.2    +      -       -      -
     82H  PHE*     3.5    56.3    +      -       +      +
     85H  ASN      2.7    21.6    +      -       -      +
     86H  LEU*     3.2    22.4    -      -       +      +
     88H  GLU*     1.3    72.7    -      -       -      +
     90H  THR*     1.3    65.3    +      -       -      +
     92H  ILE*     3.3     5.5    +      -       -      +
     93H  ASP*     2.9    26.0    +      -       +      +
----------------------------------------------------------
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Residues in contact with THR 90 (chain H). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     63G  MET*     3.9    22.2    -      -       +      -
     65G  LEU*     4.1    18.8    -      -       +      -
     70G  SER*     5.4     4.3    -      -       -      +
     74G  TYR*     3.9    19.4    -      -       +      +
     86H  LEU*     2.5    43.6    +      -       -      +
     87H  LYS*     3.5     7.8    -      -       -      -
     88H  GLU      3.0     0.2    +      -       -      -
     89H  ARG*     1.3    75.0    -      -       -      +
     91H  LEU*     1.3    61.7    +      -       +      +
     93H  ASP*     3.3     9.2    -      -       -      +
     94H  MET*     3.1    26.6    +      -       +      +
----------------------------------------------------------
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Residues in contact with LEU 91 (chain H). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     63G  MET*     5.6     6.7    -      -       +      -
     87H  LYS*     3.1    20.4    -      -       +      +
     88H  GLU*     2.7    13.1    +      -       +      +
     90H  THR*     1.3    71.4    -      -       +      +
     92H  ILE*     1.3    70.0    +      -       -      +
     93H  ASP      3.0     2.2    -      -       -      -
     94H  MET*     3.0    11.6    +      -       -      -
     95H  TYR*     2.7    53.7    +      -       +      +
    149H  VAL*     3.8    26.2    -      -       +      -
----------------------------------------------------------
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Residues in contact with ILE 92 (chain H). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     81H  LEU      4.1     0.2    -      -       -      +
     82H  PHE*     4.0    18.6    -      -       +      -
     83H  GLY*     3.9    22.7    -      -       -      +
     88H  GLU      3.2    18.6    -      -       -      +
     89H  ARG*     3.5     7.9    -      -       -      +
     91H  LEU*     1.3    76.6    -      -       -      +
     93H  ASP*     1.3    54.1    -      -       -      +
     95H  TYR*     3.2     3.2    +      -       -      +
     96H  VAL*     2.7    44.8    +      -       +      +
    149H  VAL*     4.0    22.0    -      -       +      +
    154H  SER*     3.2    29.8    -      -       -      +
    155H  LEU*     4.1     8.1    -      -       +      -
    156H  ALA*     3.7    29.4    -      -       +      +
----------------------------------------------------------
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Residues in contact with ASP 93 (chain H). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     70G  SER*     3.0    31.9    +      -       -      +
     73G  HIS*     3.3    29.6    +      -       -      +
     73H  HIS*     4.3     4.7    +      -       -      -
     82H  PHE*     4.4    15.9    -      -       +      -
     89H  ARG*     2.9    18.3    +      -       +      +
     90H  THR*     3.3     9.4    -      -       -      +
     92H  ILE*     1.3    78.5    -      -       -      +
     94H  MET*     1.3    64.3    +      -       -      +
     96H  VAL*     3.0     7.2    +      -       -      +
     97H  GLU*     2.8    39.0    +      -       -      +
----------------------------------------------------------
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Residues in contact with MET 94 (chain H). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     51G  LEU*     4.3    22.7    -      -       +      -
     52G  PHE*     3.6     7.2    -      -       -      -
     64G  LYS      3.6     4.9    -      -       -      +
     65G  LEU*     2.7    39.7    -      -       +      -
     66G  VAL*     2.5    54.7    -      -       +      +
     67G  GLN*     4.0     4.2    -      -       +      +
     70G  SER*     3.6    15.2    +      -       -      -
     90H  THR*     3.1    16.9    +      -       +      +
     91H  LEU*     3.0    15.0    +      -       -      +
     93H  ASP*     1.3    79.4    -      -       -      +
     95H  TYR*     1.3    64.9    +      -       +      +
     97H  GLU*     3.8     0.7    -      -       -      +
     98H  GLY      2.9    20.8    +      -       -      -
----------------------------------------------------------
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Residues in contact with TYR 95 (chain H). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     51G  LEU*     4.0    25.6    -      -       +      +
     52G  PHE*     4.2     6.3    -      +       -      -
     91H  LEU*     2.7    49.9    +      -       +      +
     92H  ILE      3.5     5.6    -      -       -      +
     94H  MET*     1.3    74.9    -      -       +      +
     96H  VAL*     1.3    65.4    +      -       -      +
     98H  GLY*     3.8     0.5    -      -       -      -
     99H  THR*     2.7    29.8    +      -       -      -
    136H  PHE*     4.0    19.5    -      +       +      -
    139H  ILE*     3.4    34.1    -      -       +      +
    148H  LEU*     4.2    15.9    -      -       +      -
    149H  VAL*     3.5    28.4    -      -       +      +
    156H  ALA*     3.7    21.1    -      -       +      +
----------------------------------------------------------
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Residues in contact with VAL 96 (chain H). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     72H  LEU*     5.4     3.1    -      -       +      -
     73H  HIS*     5.8     4.3    -      -       +      +
     92H  ILE*     2.7    26.7    +      -       +      +
     93H  ASP*     3.4     6.1    -      -       -      +
     95H  TYR*     1.3    78.4    -      -       -      +
     97H  GLU*     1.3    69.5    +      -       -      +
     99H  THR*     3.1     5.2    +      -       -      -
    100H  LEU*     2.9    39.2    +      -       +      +
    155H  LEU*     4.1    21.5    -      -       +      +
    156H  ALA*     3.5    31.9    -      -       -      +
    159H  ILE*     4.2    17.5    -      -       +      -
----------------------------------------------------------
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Residues in contact with GLU 97 (chain H). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     67G  GLN*     3.1    30.5    -      -       +      +
     69G  ARG*     4.0    15.6    -      -       +      +
     70G  SER*     3.0    28.5    -      -       -      +
     69H  ARG*     3.0    39.3    +      -       -      +
     73H  HIS*     3.8    17.8    +      -       -      -
     93H  ASP*     2.8    26.2    +      -       -      +
     96H  VAL*     1.3    78.4    -      -       -      +
     98H  GLY*     1.3    65.1    +      -       -      +
    100H  LEU*     3.2     6.9    +      -       -      +
    101H  ASP*     3.0    26.3    +      -       -      +
----------------------------------------------------------
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Residues in contact with GLY 98 (chain H). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     52G  PHE*     3.8    19.5    -      -       -      -
     67G  GLN*     3.5    20.2    -      -       -      -
     94H  MET      2.9    10.7    +      -       -      -
     95H  TYR      3.8     0.2    -      -       -      -
     97H  GLU*     1.3    77.7    -      -       -      +
     99H  THR*     1.3    64.9    +      -       -      +
    101H  ASP*     2.9    18.6    +      -       -      +
    102H  LEU      3.3     1.2    +      -       -      -
    132H  TYR*     3.3    19.0    -      -       -      -
----------------------------------------------------------
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Residues in contact with THR 99 (chain H). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     52G  PHE*     5.1     0.4    -      -       -      -
     95H  TYR*     2.7    19.9    +      -       -      +
     96H  VAL*     3.7     4.3    -      -       -      -
     98H  GLY*     1.3    75.8    -      -       -      +
    100H  LEU*     1.3    59.1    +      -       -      +
    102H  LEU*     2.8    12.4    +      -       +      +
    103H  LEU*     2.7    26.6    +      -       -      +
    132H  TYR*     4.5     4.0    -      -       -      -
    136H  PHE*     3.7    19.0    -      -       +      -
    156H  ALA      5.3     1.4    +      -       -      -
    159H  ILE*     4.0    18.8    -      -       +      +
    160H  LEU*     4.1    17.6    -      -       +      +
    163H  THR*     3.4    32.1    -      -       +      +
----------------------------------------------------------
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Residues in contact with LEU 100 (chain H). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     18H  SER*     4.6     7.6    -      -       -      +
     68H  THR*     6.1     2.5    -      -       +      -
     69H  ARG*     3.9    48.0    -      -       +      +
     72H  LEU*     4.6    13.7    -      -       +      -
     96H  VAL*     2.9    33.9    +      -       +      +
     97H  GLU*     3.4     9.2    -      -       -      +
     99H  THR*     1.3    78.2    -      -       -      +
    101H  ASP*     1.3    64.5    +      -       -      +
    103H  LEU*     3.6    27.9    -      -       +      +
    104H  GLU*     3.1    28.5    +      -       -      +
    159H  ILE*     4.0    13.0    -      -       +      -
----------------------------------------------------------
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Residues in contact with ASP 101 (chain H). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     54G  GLN*     4.4     7.4    +      -       -      +
     67G  GLN*     3.5    26.5    +      -       -      +
     69H  ARG*     4.8    10.4    +      -       -      -
     97H  GLU      3.0    15.9    +      -       -      +
     98H  GLY      2.9     9.3    +      -       -      +
     99H  THR      2.9     0.8    -      -       -      -
    100H  LEU*     1.3    80.8    -      -       -      +
    102H  LEU*     1.3    60.3    +      -       -      +
    104H  GLU*     3.3    16.5    -      -       -      +
    105H  LEU*     4.2     7.3    -      -       -      +
    132H  TYR*     3.7    14.5    +      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 102 (chain H). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     98H  GLY      3.3     2.8    +      -       -      +
     99H  THR*     2.8    14.7    +      -       +      +
    101H  ASP*     1.3    73.6    -      -       -      +
    103H  LEU*     1.3    66.2    +      -       -      +
    104H  GLU      2.9     5.9    +      -       -      -
    105H  LEU*     3.0    31.9    +      -       +      +
    106H  LEU*     3.9     3.1    +      -       -      +
    124H  MET*     4.2     7.6    -      -       +      +
    127H  LYS*     4.1     9.6    -      -       +      -
    128H  ALA*     4.1    22.2    -      -       +      +
    132H  TYR*     4.0    45.5    +      -       +      -
    133H  PHE*     4.5     7.2    -      -       +      -
    160H  LEU*     6.1     1.3    -      -       +      -
    163H  THR*     4.0    13.9    -      -       +      -
    167H  LEU*     3.9    25.8    -      -       +      -
----------------------------------------------------------
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Residues in contact with LEU 103 (chain H). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     18H  SER*     3.9     6.3    -      -       -      +
     99H  THR      2.7    14.2    +      -       -      +
    100H  LEU*     3.6    27.4    -      -       +      +
    102H  LEU*     1.3    77.4    -      -       -      +
    104H  GLU*     1.3    62.6    +      -       -      +
    106H  LEU*     2.8    39.7    +      -       +      +
    107H  ILE*     3.0    26.5    +      -       +      +
    159H  ILE*     4.8     1.1    -      -       +      -
    162H  GLN*     3.7    35.0    -      -       +      +
    163H  THR*     3.7    29.3    -      -       +      +
    166H  ALA*     4.8     3.6    -      -       +      -
----------------------------------------------------------
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Residues in contact with GLU 104 (chain H). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     15H  ARG*     2.7    43.2    +      -       -      -
     69H  ARG*     5.7     3.1    +      -       -      -
    100H  LEU*     3.1    14.4    +      -       -      +
    101H  ASP*     3.3    19.1    -      -       -      +
    103H  LEU*     1.3    79.2    -      -       -      +
    105H  LEU*     1.3    61.3    +      -       +      +
    107H  ILE*     3.3     8.8    -      -       -      +
    108H  MET*     2.8    55.9    +      -       +      +
----------------------------------------------------------
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Residues in contact with LEU 105 (chain H). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    101H  ASP      4.2    10.3    -      -       -      +
    102H  LEU*     3.3    26.2    -      -       +      +
    104H  GLU*     1.3    81.8    -      -       +      +
    106H  LEU*     1.3    62.6    +      -       +      +
    108H  MET*     3.9    25.2    -      -       +      +
    109H  HIS*     3.2    23.6    +      -       -      +
    120H  GLU*     4.9     9.6    -      -       -      +
    123H  ASN*     4.5     9.0    -      -       -      +
    124H  MET*     3.5    45.9    -      -       +      +
    127H  LYS*     4.4    14.4    -      -       +      -
----------------------------------------------------------
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Residues in contact with LEU 106 (chain H). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    102H  LEU      4.8     2.7    -      -       -      +
    103H  LEU*     2.8    27.5    +      -       +      +
    105H  LEU*     1.3    82.0    -      -       +      +
    107H  ILE*     1.3    63.4    +      -       +      +
    109H  HIS*     3.2     4.2    -      -       -      +
    110H  PRO*     3.1    20.6    -      -       -      +
    124H  MET*     3.7    28.0    -      -       +      -
    163H  THR*     4.2     4.9    -      -       +      +
    166H  ALA*     3.5    38.4    -      -       +      +
    167H  LEU*     3.8    23.3    -      -       +      -
    170H  LYS*     4.2    21.2    +      -       +      +
----------------------------------------------------------
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Residues in contact with ILE 107 (chain H). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     14H  GLY*     3.6    28.9    -      -       -      +
     15H  ARG*     4.0    51.6    -      -       +      +
     18H  SER*     6.0     0.7    -      -       -      +
    103H  LEU*     3.3    30.5    -      -       +      +
    104H  GLU*     3.3    15.0    -      -       -      +
    106H  LEU*     1.3    80.4    -      -       +      +
    108H  MET*     1.3    60.7    +      -       +      +
    110H  PRO*     3.5    11.1    -      -       -      +
    111H  PHE*     4.1    10.6    -      -       -      -
----------------------------------------------------------
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Residues in contact with MET 108 (chain H). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    104H  GLU*     2.8    48.8    +      -       +      +
    105H  LEU*     3.9    28.9    -      -       +      +
    107H  ILE*     1.3    74.8    -      -       +      +
    109H  HIS*     1.3    67.1    +      -       -      +
    110H  PRO*     3.2     2.0    -      -       -      -
    111H  PHE*     2.9    23.2    +      -       -      +
    112H  LEU*     3.8    19.9    -      -       +      +
    120H  GLU*     5.3     8.5    -      -       -      +
----------------------------------------------------------
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Residues in contact with HIS 109 (chain H). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    105H  LEU      3.2    11.9    +      -       -      +
    106H  LEU*     3.2    11.2    -      -       -      +
    108H  MET*     1.3    78.3    -      -       -      +
    110H  PRO*     1.3    70.3    -      -       +      +
    111H  PHE      2.9     1.9    +      -       -      -
    112H  LEU*     3.0    19.0    +      -       +      +
    117H  GLN*     2.9    68.5    +      -       +      +
    120H  GLU*     4.2    11.9    -      -       +      -
    121H  VAL*     3.6    11.0    -      -       +      +
    124H  MET*     3.7    20.9    -      -       +      -
    170H  LYS*     2.6    33.3    +      -       +      +
----------------------------------------------------------
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Residues in contact with PRO 110 (chain H). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    106H  LEU      3.1    11.7    -      -       -      +
    107H  ILE      3.5     9.4    -      -       -      +
    108H  MET      3.2     4.5    -      -       -      -
    109H  HIS*     1.3   101.1    -      -       +      +
    111H  PHE*     1.3    71.4    +      -       +      +
    112H  LEU      3.2     5.1    +      -       -      +
    117H  GLN*     3.7    12.6    +      -       -      +
    170H  LYS*     5.2     2.2    -      -       -      +
    208H  PRO*     4.0    30.5    -      -       +      +
    212H  TYR*     5.8     0.4    -      -       +      -
    213H  VAL*     4.2    26.1    -      -       +      +
----------------------------------------------------------
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Residues in contact with PHE 111 (chain H). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    107H  ILE      4.1    11.0    -      -       -      -
    108H  MET*     2.9    17.2    +      -       -      +
    110H  PRO*     1.3    97.0    -      -       +      +
    112H  LEU*     1.3    66.6    +      -       +      +
    113H  LYS*     4.0     6.1    +      -       -      +
    212H  TYR*     4.2    21.3    -      +       -      -
    213H  VAL*     3.9    22.7    -      -       +      -
    216H  VAL*     3.7    32.8    -      -       +      -
    217H  TYR*     3.5    40.2    +      +       -      +
----------------------------------------------------------
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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