Contacts of the helix formed by residues 86 - 111 (chain C) 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 C).
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     85C  ASN*     1.3    76.5    -      -       -      +
     87C  LYS*     1.3    60.0    +      -       -      +
     89C  ARG*     3.2    14.8    -      -       +      +
     90C  THR*     2.5    52.8    +      -       -      +
     74D  TYR*     3.7    28.9    -      -       +      -
     77D  ASP*     4.0    34.5    -      -       +      +
     78D  LYS*     3.7    23.6    -      -       +      +
----------------------------------------------------------
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Residues in contact with LYS 87 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     85C  ASN*     2.7    16.3    +      -       -      +
     86C  LEU*     1.3    81.8    -      -       -      +
     88C  GLU*     1.3    65.5    +      -       +      +
     90C  THR*     3.4     3.6    +      -       -      -
     91C  LEU*     3.1    27.7    +      -       +      +
     61D  ASP*     4.5     5.5    +      -       -      +
     63D  MET*     3.6    29.4    -      -       +      +
     74D  TYR*     2.8    41.5    +      -       +      -
     78D  LYS*     5.3     4.2    -      -       -      +
----------------------------------------------------------
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Residues in contact with GLU 88 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     83C  GLY*     3.6     9.2    -      -       -      -
     84C  LYS*     3.0    38.6    +      -       -      +
     85C  ASN*     3.0    36.4    +      -       -      +
     87C  LYS*     1.3    75.9    -      -       +      +
     89C  ARG*     1.3    53.6    +      -       -      +
     91C  LEU*     2.7    30.8    +      -       +      +
     92C  ILE*     3.0    16.3    +      -       -      +
    149C  VAL*     4.0    18.5    -      -       +      +
    150C  GLY*     4.1    25.6    -      -       -      +
    152C  GLN*     5.2     1.9    +      -       -      -
----------------------------------------------------------
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Residues in contact with ARG 89 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     73C  HIS*     5.1     5.1    +      -       -      +
     77C  ASP*     3.0    41.6    +      -       -      -
     82C  PHE*     3.5    56.0    +      -       +      +
     85C  ASN      2.7    22.8    +      -       -      +
     86C  LEU*     3.2    22.0    -      -       +      +
     88C  GLU*     1.3    72.3    -      -       -      +
     90C  THR*     1.3    64.5    +      -       -      +
     92C  ILE*     3.3     5.5    +      -       -      +
     93C  ASP*     2.9    26.4    +      -       +      +
     77D  ASP*     4.4     2.6    +      -       -      -
     89D  ARG*     2.9    39.8    -      -       -      +
----------------------------------------------------------
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Residues in contact with THR 90 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     86C  LEU*     2.5    35.9    +      -       -      +
     87C  LYS*     3.5     8.1    -      -       -      -
     89C  ARG*     1.3    75.0    -      -       -      +
     91C  LEU*     1.3    62.8    +      -       +      +
     93C  ASP*     3.3     8.3    -      -       -      +
     94C  MET*     3.1    25.6    +      -       +      +
     63D  MET*     4.0    12.1    -      -       +      -
     65D  LEU*     3.9    29.6    -      -       +      -
     70D  SER*     5.2     5.3    -      -       -      +
     74D  TYR*     3.6    28.9    -      -       +      +
----------------------------------------------------------
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Residues in contact with LEU 91 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     87C  LYS*     3.1    19.5    -      -       +      +
     88C  GLU*     2.7    14.3    +      -       +      +
     90C  THR*     1.3    69.4    -      -       +      +
     92C  ILE*     1.3    70.0    +      -       -      +
     93C  ASP      3.0     1.3    -      -       -      -
     94C  MET*     3.0    10.5    +      -       -      +
     95C  TYR*     2.7    54.2    +      -       +      +
    149C  VAL*     3.8    25.8    -      -       +      -
     63D  MET*     5.4    10.1    -      -       +      -
     65D  LEU*     6.5     0.4    -      -       +      -
----------------------------------------------------------
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Residues in contact with ILE 92 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     81C  LEU      4.4     0.2    -      -       -      +
     82C  PHE*     4.0    17.5    -      -       +      -
     83C  GLY*     3.9    22.9    -      -       -      +
     88C  GLU      3.2    18.8    -      -       -      +
     89C  ARG*     3.5     7.2    -      -       -      +
     91C  LEU*     1.3    76.4    -      -       -      +
     93C  ASP*     1.3    53.5    +      -       -      +
     95C  TYR*     3.2     2.8    +      -       -      +
     96C  VAL*     2.7    45.3    +      -       +      +
    149C  VAL*     4.0    20.9    -      -       +      +
    154C  SER*     3.2    29.4    -      -       -      +
    155C  LEU*     4.1     9.0    -      -       +      -
    156C  ALA*     3.7    28.7    -      -       +      +
----------------------------------------------------------
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Residues in contact with ASP 93 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     73C  HIS*     4.3     3.9    +      -       -      -
     82C  PHE*     4.4    14.1    -      -       +      -
     89C  ARG*     2.9    19.2    +      -       +      +
     90C  THR*     3.3     9.4    -      -       -      +
     92C  ILE*     1.3    78.9    -      -       -      +
     94C  MET*     1.3    63.6    +      -       -      +
     96C  VAL*     3.0     7.1    +      -       -      +
     97C  GLU*     2.8    37.6    +      -       -      +
     70D  SER*     2.9    34.7    +      -       -      +
     73D  HIS*     3.2    31.6    +      -       -      +
----------------------------------------------------------
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Residues in contact with MET 94 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     90C  THR*     3.1    15.0    +      -       +      +
     91C  LEU*     3.0    14.6    +      -       -      +
     93C  ASP*     1.3    79.1    -      -       -      +
     95C  TYR*     1.3    67.1    +      -       +      +
     97C  GLU*     3.8     0.7    -      -       -      +
     98C  GLY      2.9    20.6    +      -       -      -
     51D  LEU*     4.3    17.9    -      -       +      -
     52D  PHE*     3.6     6.8    -      -       -      -
     64D  LYS      3.5     4.5    -      -       -      +
     65D  LEU*     2.5    42.8    -      -       +      -
     66D  VAL*     2.3    59.7    -      -       +      +
     67D  GLN*     3.8     4.8    -      -       +      +
     70D  SER*     3.4    14.8    -      -       -      -
----------------------------------------------------------
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Residues in contact with TYR 95 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     91C  LEU*     2.7    48.8    +      -       +      +
     92C  ILE      3.5     5.2    -      -       -      +
     94C  MET*     1.3    73.6    -      -       +      +
     96C  VAL*     1.3    64.3    +      -       -      +
     98C  GLY*     3.4     0.5    +      -       -      -
     99C  THR*     2.7    30.6    +      -       -      +
    136C  PHE*     4.0    18.9    -      +       +      -
    139C  ILE*     3.4    33.0    -      -       +      +
    148C  LEU*     4.2    15.3    -      -       +      -
    149C  VAL*     3.5    29.7    -      -       +      +
    156C  ALA*     3.7    21.8    -      -       +      -
     51D  LEU*     3.8    27.4    -      -       +      +
     52D  PHE*     4.2     5.8    -      +       -      -
----------------------------------------------------------
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Residues in contact with VAL 96 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     72C  LEU*     5.4     3.1    -      -       +      -
     73C  HIS*     5.8     3.8    -      -       +      +
     82C  PHE*     6.5     0.2    -      -       +      -
     92C  ILE*     2.7    26.7    +      -       +      +
     93C  ASP*     3.4     6.1    -      -       -      +
     95C  TYR*     1.3    78.8    -      -       -      +
     97C  GLU*     1.3    70.2    +      -       -      +
     99C  THR*     3.1     5.0    +      -       -      -
    100C  LEU*     2.9    39.2    +      -       +      +
    155C  LEU*     4.1    19.7    -      -       +      +
    156C  ALA*     3.5    31.9    -      -       -      +
    159C  ILE*     4.2    17.3    -      -       +      -
----------------------------------------------------------
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Residues in contact with GLU 97 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     69C  ARG*     3.0    38.8    +      -       -      +
     73C  HIS*     3.8    17.5    +      -       -      -
     93C  ASP*     2.8    26.0    +      -       -      +
     96C  VAL*     1.3    78.4    -      -       -      +
     98C  GLY*     1.3    64.6    +      -       -      +
    100C  LEU*     3.2     7.3    +      -       -      +
    101C  ASP*     3.0    26.0    +      -       -      +
     67D  GLN*     3.0    32.1    -      -       +      +
     69D  ARG*     3.9    14.8    -      -       +      +
     70D  SER*     3.0    28.3    -      -       -      +
----------------------------------------------------------
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Residues in contact with GLY 98 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     94C  MET      2.9    11.3    +      -       -      -
     97C  GLU*     1.3    76.6    -      -       -      +
     99C  THR*     1.3    64.4    +      -       -      +
    101C  ASP*     2.9    18.8    +      -       -      +
    102C  LEU      3.3     1.2    +      -       -      -
    132C  TYR*     3.3    18.7    -      -       -      -
     52D  PHE*     3.7    19.3    -      -       -      -
     67D  GLN*     3.3    19.6    -      -       -      -
----------------------------------------------------------
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Residues in contact with THR 99 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     95C  TYR      2.7    19.5    +      -       -      -
     96C  VAL*     3.7     4.0    -      -       -      -
     98C  GLY*     1.3    76.2    -      -       -      +
    100C  LEU*     1.3    58.4    +      -       -      +
    102C  LEU*     2.8    13.5    +      -       +      +
    103C  LEU*     2.7    26.3    +      -       -      +
    132C  TYR*     4.9     3.6    -      -       -      -
    136C  PHE*     3.7    18.6    -      -       +      -
    156C  ALA      5.3     1.6    +      -       -      -
    159C  ILE*     4.0    19.3    -      -       +      +
    160C  LEU*     4.1    18.3    -      -       +      +
    163C  THR*     3.4    31.6    -      -       +      +
     52D  PHE*     5.1     0.2    -      -       -      -
----------------------------------------------------------
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Residues in contact with LEU 100 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     18C  SER*     4.6     7.4    -      -       -      +
     68C  THR*     6.1     1.8    -      -       +      -
     69C  ARG*     3.9    46.6    +      -       +      +
     72C  LEU*     4.6    12.8    -      -       +      -
     96C  VAL*     2.9    33.7    +      -       +      +
     97C  GLU*     3.4     9.4    -      -       -      +
     99C  THR*     1.3    76.9    -      -       -      +
    101C  ASP*     1.3    64.3    +      -       -      +
    103C  LEU*     3.6    27.0    -      -       +      +
    104C  GLU*     3.1    28.5    +      -       -      +
    159C  ILE*     4.0    13.2    -      -       +      -
----------------------------------------------------------
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Residues in contact with ASP 101 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     69C  ARG*     4.8     9.7    +      -       -      -
     97C  GLU      3.0    14.4    +      -       -      +
     98C  GLY      2.9     9.3    +      -       -      +
     99C  THR      2.9     0.8    -      -       -      -
    100C  LEU*     1.3    81.8    -      -       -      +
    102C  LEU*     1.3    60.4    +      -       -      +
    104C  GLU*     3.3    16.4    -      -       -      +
    105C  LEU*     4.2     7.3    -      -       -      +
    132C  TYR*     3.7    14.6    +      -       -      +
     54D  GLN*     4.3     7.6    +      -       -      +
     67D  GLN*     3.5    24.6    +      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 102 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     98C  GLY      3.3     2.6    +      -       -      +
     99C  THR*     2.8    15.8    +      -       +      +
    101C  ASP*     1.3    71.5    -      -       -      +
    103C  LEU*     1.3    65.7    +      -       -      +
    104C  GLU      2.9     6.0    +      -       -      -
    105C  LEU*     3.0    31.7    +      -       +      +
    106C  LEU*     3.9     3.3    +      -       +      +
    124C  MET*     4.2     7.6    -      -       -      +
    127C  LYS*     4.1     9.9    -      -       +      -
    128C  ALA*     4.1    22.7    -      -       +      +
    132C  TYR*     4.0    45.3    +      -       +      -
    133C  PHE*     4.5     6.5    -      -       +      -
    160C  LEU*     6.1     1.6    -      -       +      -
    163C  THR*     4.0    14.1    -      -       +      -
    167C  LEU*     3.9    26.5    -      -       +      -
----------------------------------------------------------
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Residues in contact with LEU 103 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     18C  SER*     3.9     5.8    -      -       -      +
     99C  THR      2.7    15.0    +      -       -      +
    100C  LEU*     3.6    27.4    -      -       +      +
    102C  LEU*     1.3    76.7    -      -       -      +
    104C  GLU*     1.3    63.9    +      -       -      +
    106C  LEU*     2.8    39.1    +      -       +      +
    107C  ILE*     3.0    25.7    +      -       +      +
    159C  ILE*     4.8     0.7    -      -       +      -
    162C  GLN*     3.7    35.7    -      -       +      +
    163C  THR*     3.7    29.6    -      -       +      +
    166C  ALA*     4.8     3.4    -      -       +      -
----------------------------------------------------------
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Residues in contact with GLU 104 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     15C  ARG*     2.7    43.7    +      -       -      -
     69C  ARG*     5.7     3.1    +      -       -      -
    100C  LEU*     3.1    14.3    +      -       -      +
    101C  ASP*     3.3    19.1    -      -       -      +
    103C  LEU*     1.3    79.8    -      -       -      +
    105C  LEU*     1.3    61.3    +      -       +      +
    107C  ILE*     3.0     8.7    +      -       -      +
    108C  MET*     2.8    57.0    +      -       +      +
----------------------------------------------------------
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Residues in contact with LEU 105 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    101C  ASP      4.2     9.9    -      -       -      +
    102C  LEU*     3.3    26.2    -      -       +      +
    104C  GLU*     1.3    82.6    -      -       +      +
    106C  LEU*     1.3    62.4    +      -       +      +
    108C  MET*     3.9    25.1    -      -       +      +
    109C  HIS*     3.2    23.7    +      -       -      +
    120C  GLU*     4.9     9.9    -      -       -      +
    123C  ASN*     4.5     7.6    -      -       -      +
    124C  MET*     3.5    46.2    -      -       +      +
    127C  LYS*     4.4    15.3    -      -       +      -
----------------------------------------------------------
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Residues in contact with LEU 106 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    102C  LEU*     4.8     3.4    -      -       +      +
    103C  LEU*     2.8    26.4    +      -       +      +
    105C  LEU*     1.3    82.4    -      -       +      +
    107C  ILE*     1.3    64.0    +      -       +      +
    109C  HIS*     3.2     4.0    -      -       -      +
    110C  PRO*     3.1    20.8    -      -       -      +
    124C  MET*     3.7    28.0    -      -       +      -
    163C  THR*     4.2     5.4    -      -       +      +
    166C  ALA*     3.5    37.2    -      -       +      +
    167C  LEU*     3.8    23.8    -      -       +      +
    170C  LYS*     4.2    21.4    +      -       +      -
----------------------------------------------------------
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Residues in contact with ILE 107 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     14C  GLY*     3.6    29.6    -      -       -      +
     15C  ARG*     4.0    51.6    -      -       +      +
     18C  SER*     6.0     0.4    -      -       -      +
    103C  LEU*     3.3    31.0    -      -       +      +
    104C  GLU*     3.3    15.9    -      -       -      +
    106C  LEU*     1.3    80.1    -      -       +      +
    108C  MET*     1.3    60.4    +      -       +      +
    110C  PRO*     3.5    11.0    -      -       -      +
    111C  PHE*     4.1    10.6    -      -       -      -
----------------------------------------------------------
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Residues in contact with MET 108 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    104C  GLU*     2.8    49.1    +      -       +      +
    105C  LEU*     3.9    29.4    -      -       +      +
    107C  ILE*     1.3    73.4    -      -       +      +
    109C  HIS*     1.3    68.1    +      -       -      +
    110C  PRO*     3.2     2.2    -      -       -      -
    111C  PHE*     2.9    23.8    +      -       -      +
    112C  LEU*     3.8    19.0    -      -       +      +
    120C  GLU*     5.3     8.5    -      -       -      +
----------------------------------------------------------
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Residues in contact with HIS 109 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    105C  LEU      3.2    12.5    +      -       -      +
    106C  LEU*     3.2    11.0    -      -       -      +
    108C  MET*     1.3    77.7    -      -       -      +
    110C  PRO*     1.3    70.3    -      -       +      +
    111C  PHE      2.9     2.1    +      -       -      -
    112C  LEU*     3.0    18.6    +      -       +      +
    117C  GLN*     2.9    69.6    +      -       +      +
    118C  GLN*     6.1     0.2    -      -       -      -
    120C  GLU*     4.2    11.9    -      -       +      -
    121C  VAL*     3.6     9.9    -      -       +      +
    124C  MET*     3.7    20.9    -      -       +      -
    170C  LYS*     2.7    31.3    +      -       -      +
----------------------------------------------------------
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Residues in contact with PRO 110 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    106C  LEU      3.1    11.4    -      -       -      +
    107C  ILE      3.5     9.0    -      -       -      +
    108C  MET      3.2     4.7    -      -       -      -
    109C  HIS*     1.3   101.1    -      -       +      +
    111C  PHE*     1.3    74.0    +      -       +      +
    112C  LEU      3.2     4.7    +      -       -      +
    117C  GLN*     3.7    13.1    +      -       -      +
    170C  LYS*     5.2     3.1    -      -       -      +
    208C  PRO*     4.0    29.8    -      -       +      +
    212C  TYR*     5.8     0.2    -      -       +      -
    213C  VAL*     4.2    26.1    -      -       +      +
----------------------------------------------------------
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Residues in contact with PHE 111 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    107C  ILE      4.1    10.1    -      -       -      -
    108C  MET*     2.9    16.1    +      -       -      +
    110C  PRO*     1.3    96.3    -      -       +      +
    112C  LEU*     1.3    66.5    +      -       +      +
    113C  LYS*     4.0     5.7    +      -       -      +
    212C  TYR*     4.2    21.3    -      +       -      -
    213C  VAL*     3.9    22.9    -      -       +      -
    216C  VAL*     3.7    32.3    -      -       +      -
    217C  TYR*     3.5    40.3    +      +       +      +
----------------------------------------------------------
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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