Contacts of the helix formed by residues 86 - 111 (chain D) 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 D).
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     74C  TYR*     3.9    17.7    -      -       +      -
     77C  ASP*     4.2    32.1    -      -       +      +
     78C  LYS*     3.9    33.4    -      -       +      +
     85D  ASN*     1.3    77.3    -      -       -      +
     87D  LYS*     1.3    61.8    +      -       -      +
     89D  ARG*     3.2    15.4    -      -       +      +
     90D  THR*     2.5    53.5    +      -       -      +
----------------------------------------------------------
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Residues in contact with LYS 87 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     61C  ASP*     4.8     4.9    +      -       -      +
     63C  MET*     3.9    28.1    -      -       +      +
     74C  TYR*     3.2    33.3    +      -       -      -
     78C  LYS*     5.4     4.6    -      -       -      +
     85D  ASN*     2.7    16.0    +      -       -      +
     86D  LEU*     1.3    85.2    -      -       +      +
     88D  GLU*     1.3    65.2    -      -       +      +
     90D  THR*     3.4     4.6    +      -       -      +
     91D  LEU*     3.1    28.0    +      -       +      +
----------------------------------------------------------
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Residues in contact with GLU 88 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     83D  GLY*     3.6     9.2    -      -       -      -
     84D  LYS*     3.0    38.2    +      -       -      +
     85D  ASN*     3.0    35.2    +      -       -      +
     87D  LYS*     1.3    76.1    -      -       +      +
     89D  ARG*     1.3    54.8    +      -       -      +
     91D  LEU*     2.7    30.7    +      -       +      +
     92D  ILE*     3.0    15.9    +      -       -      +
    149D  VAL*     4.0    18.2    -      -       +      +
    150D  GLY*     4.1    25.4    -      -       -      +
    152D  GLN*     5.2     1.7    +      -       -      -
----------------------------------------------------------
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Residues in contact with ARG 89 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     77C  ASP*     4.4     2.8    +      -       -      -
     89C  ARG*     2.9    41.5    -      -       -      +
     73D  HIS*     5.1     5.5    +      -       -      +
     77D  ASP*     3.0    41.2    +      -       -      -
     82D  PHE*     3.5    55.6    +      -       +      +
     85D  ASN      2.7    22.8    +      -       -      +
     86D  LEU*     3.2    21.8    -      -       +      +
     88D  GLU*     1.3    73.1    -      -       -      +
     90D  THR*     1.3    65.6    +      -       -      +
     92D  ILE*     3.3     5.7    +      -       -      +
     93D  ASP*     2.9    25.7    +      -       +      +
----------------------------------------------------------
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Residues in contact with THR 90 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     63C  MET*     3.9    23.6    -      -       +      -
     65C  LEU*     4.2    17.7    -      -       +      -
     70C  SER*     5.5     3.3    -      -       -      +
     74C  TYR*     3.8    20.5    -      -       +      +
     86D  LEU*     2.5    45.0    +      -       -      +
     87D  LYS*     3.5     8.0    -      -       -      -
     88D  GLU      3.0     0.2    +      -       -      -
     89D  ARG*     1.3    74.8    -      -       -      +
     91D  LEU*     1.3    61.7    +      -       +      +
     93D  ASP*     3.3     8.7    -      -       -      +
     94D  MET*     3.1    26.7    +      -       +      +
----------------------------------------------------------
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Residues in contact with LEU 91 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     63C  MET*     5.6     8.7    -      -       +      -
     87D  LYS*     3.1    20.2    -      -       +      +
     88D  GLU*     2.7    13.9    +      -       +      +
     90D  THR*     1.3    68.7    -      -       +      +
     92D  ILE*     1.3    71.5    +      -       -      +
     93D  ASP      3.0     1.8    -      -       -      -
     94D  MET*     3.0    11.2    +      -       -      -
     95D  TYR*     2.7    53.0    +      -       +      +
    149D  VAL*     3.8    25.6    -      -       +      -
----------------------------------------------------------
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Residues in contact with ILE 92 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     82D  PHE*     4.0    17.5    -      -       +      -
     83D  GLY*     3.9    22.7    -      -       -      +
     88D  GLU      3.2    18.6    -      -       -      +
     89D  ARG*     3.5     7.0    -      -       -      +
     91D  LEU*     1.3    75.8    -      -       -      +
     93D  ASP*     1.3    53.9    +      -       -      +
     95D  TYR*     3.2     3.1    +      -       -      +
     96D  VAL*     2.7    44.6    +      -       +      +
    149D  VAL*     4.0    21.3    -      -       +      +
    154D  SER*     3.2    28.9    -      -       -      +
    155D  LEU*     4.1     9.2    -      -       +      +
    156D  ALA*     3.7    29.4    -      -       +      +
----------------------------------------------------------
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Residues in contact with ASP 93 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     70C  SER*     3.1    29.8    +      -       -      +
     73C  HIS*     3.3    29.8    +      -       -      +
     73D  HIS*     4.3     4.1    +      -       -      -
     82D  PHE*     4.3    15.7    -      -       +      -
     89D  ARG*     2.9    18.8    +      -       +      +
     90D  THR*     3.3     9.5    -      -       -      +
     92D  ILE*     1.3    79.1    -      -       -      +
     94D  MET*     1.3    64.0    +      -       -      +
     96D  VAL*     3.0     7.3    +      -       -      +
     97D  GLU*     2.8    38.8    +      -       -      +
----------------------------------------------------------
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Residues in contact with MET 94 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     51C  LEU*     4.4    16.8    -      -       +      -
     52C  PHE*     3.8     7.0    -      -       -      -
     64C  LYS      3.6     5.8    -      -       -      +
     65C  LEU*     2.8    42.2    -      -       +      -
     66C  VAL*     2.7    51.1    -      -       +      +
     67C  GLN*     4.2     3.7    -      -       +      +
     70C  SER*     3.6    16.2    -      -       -      -
     90D  THR*     3.1    16.5    +      -       +      +
     91D  LEU*     3.0    15.3    +      -       -      +
     93D  ASP*     1.3    78.2    -      -       -      +
     95D  TYR*     1.3    70.7    +      -       +      +
     97D  GLU*     3.2     1.7    +      -       -      +
     98D  GLY      2.9    20.1    +      -       -      -
----------------------------------------------------------
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Residues in contact with TYR 95 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     51C  LEU*     4.3    23.1    -      -       +      -
     52C  PHE*     4.5     6.1    -      +       -      -
     91D  LEU*     2.7    48.6    +      -       +      +
     92D  ILE      3.5     5.2    -      -       -      +
     94D  MET*     1.3    76.7    -      -       +      +
     96D  VAL*     1.3    64.0    +      -       -      +
     98D  GLY*     3.4     0.7    +      -       -      -
     99D  THR*     2.7    30.8    +      -       -      +
    135D  VAL*     5.3     0.2    -      -       +      -
    136D  PHE*     4.0    19.4    -      +       +      -
    139D  ILE*     3.4    32.1    -      -       +      +
    148D  LEU*     4.2    15.7    -      -       +      -
    149D  VAL*     3.5    29.5    -      -       +      +
    156D  ALA*     3.7    21.5    -      -       +      -
----------------------------------------------------------
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Residues in contact with VAL 96 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     72D  LEU*     5.4     3.4    -      -       +      -
     73D  HIS*     5.8     4.0    -      -       +      +
     92D  ILE*     2.7    28.0    +      -       +      +
     93D  ASP*     3.4     6.1    -      -       -      +
     95D  TYR*     1.3    77.7    -      -       -      +
     97D  GLU*     1.3    70.5    +      -       -      +
     99D  THR*     3.1     5.6    +      -       -      -
    100D  LEU*     2.9    39.2    +      -       +      +
    155D  LEU*     4.1    20.9    -      -       +      +
    156D  ALA*     3.5    31.2    -      -       -      +
    159D  ILE*     4.2    17.7    -      -       +      -
----------------------------------------------------------
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Residues in contact with GLU 97 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     67C  GLN*     3.3    28.9    -      -       +      +
     69C  ARG*     4.0    14.6    -      -       +      +
     70C  SER*     2.8    30.1    -      -       -      +
     73C  HIS*     4.7     0.2    -      -       -      -
     69D  ARG*     3.0    39.5    +      -       -      +
     73D  HIS*     3.8    17.2    +      -       -      -
     93D  ASP*     2.8    25.6    +      -       -      +
     96D  VAL*     1.3    77.8    -      -       -      +
     98D  GLY*     1.3    65.2    +      -       -      +
    100D  LEU*     3.2     6.9    +      -       -      +
    101D  ASP*     3.0    26.2    +      -       -      +
----------------------------------------------------------
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Residues in contact with GLY 98 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     52C  PHE*     3.7    19.1    -      -       -      -
     67C  GLN*     3.6    19.6    -      -       -      -
     94D  MET      2.9    11.1    +      -       -      -
     97D  GLU*     1.3    77.2    -      -       -      +
     99D  THR*     1.3    63.5    +      -       -      +
    101D  ASP*     2.9    18.3    +      -       -      +
    102D  LEU      3.3     1.0    +      -       -      -
    132D  TYR*     3.3    20.4    -      -       -      -
----------------------------------------------------------
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Residues in contact with THR 99 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     52C  PHE*     5.1     0.4    -      -       -      -
     95D  TYR      2.7    19.7    +      -       -      -
     96D  VAL*     3.1     4.6    +      -       -      -
     98D  GLY*     1.3    76.1    -      -       -      +
    100D  LEU*     1.3    58.3    +      -       -      +
    102D  LEU*     2.8    13.3    +      -       +      +
    103D  LEU*     2.7    25.9    +      -       -      +
    132D  TYR*     4.5     4.0    -      -       -      -
    136D  PHE*     3.7    18.5    -      -       +      -
    156D  ALA      5.3     1.4    +      -       -      -
    159D  ILE*     4.0    19.1    -      -       +      +
    160D  LEU*     4.1    18.4    +      -       +      +
    163D  THR*     3.4    31.6    -      -       +      +
----------------------------------------------------------
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Residues in contact with LEU 100 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     18D  SER*     4.6     7.6    -      -       -      +
     68D  THR*     6.1     2.2    -      -       +      -
     69D  ARG*     3.9    47.1    -      -       +      +
     72D  LEU*     4.6    12.3    -      -       +      -
     96D  VAL*     2.9    35.2    +      -       +      +
     97D  GLU*     3.4     9.6    -      -       -      +
     99D  THR*     1.3    76.3    -      -       -      +
    101D  ASP*     1.3    63.9    +      -       -      +
    103D  LEU*     3.6    28.5    -      -       +      +
    104D  GLU*     3.1    28.5    +      -       -      +
    159D  ILE*     4.0    13.2    -      -       +      -
----------------------------------------------------------
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Residues in contact with ASP 101 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     54C  GLN*     4.4     6.2    +      -       -      +
     67C  GLN*     3.3    28.5    +      -       -      +
     69D  ARG*     4.8    10.6    +      -       -      -
     97D  GLU      3.0    15.7    +      -       -      +
     98D  GLY      2.9     9.5    +      -       -      +
     99D  THR      2.9     0.6    -      -       -      -
    100D  LEU*     1.3    80.8    -      -       -      +
    102D  LEU*     1.3    60.1    +      -       -      +
    104D  GLU*     3.3    16.5    -      -       -      +
    105D  LEU*     4.2     7.8    -      -       -      +
    132D  TYR*     3.7    13.8    +      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 102 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     98D  GLY      3.3     2.8    +      -       -      +
     99D  THR*     2.8    14.8    +      -       +      +
    101D  ASP*     1.3    73.0    -      -       -      +
    103D  LEU*     1.3    66.1    +      -       -      +
    104D  GLU      2.9     5.3    +      -       -      -
    105D  LEU*     3.0    33.3    +      -       +      +
    106D  LEU*     3.9     3.0    +      -       +      +
    124D  MET*     4.2     7.9    -      -       +      +
    127D  LYS*     4.1     9.6    -      -       +      -
    128D  ALA*     4.1    21.8    -      -       +      +
    132D  TYR*     4.0    45.5    +      -       +      -
    133D  PHE*     4.5     7.0    -      -       +      -
    160D  LEU*     6.1     1.3    -      -       +      -
    163D  THR*     4.0    13.7    -      -       +      -
    167D  LEU*     3.9    26.2    -      -       +      -
----------------------------------------------------------
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Residues in contact with LEU 103 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     18D  SER*     3.9     6.1    -      -       -      +
     99D  THR      2.7    13.7    +      -       -      +
    100D  LEU*     3.3    27.3    +      -       +      +
    102D  LEU*     1.3    77.1    -      -       -      +
    104D  GLU*     1.3    64.4    +      -       -      +
    106D  LEU*     2.8    38.4    +      -       +      +
    107D  ILE*     3.0    26.0    +      -       +      +
    159D  ILE*     4.8     0.7    -      -       +      -
    162D  GLN*     3.7    35.4    -      -       +      +
    163D  THR*     3.7    30.9    -      -       +      +
    166D  ALA*     4.8     3.8    -      -       +      -
----------------------------------------------------------
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Residues in contact with GLU 104 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     15D  ARG*     2.7    43.5    +      -       -      -
     69D  ARG*     5.7     2.8    +      -       -      -
    100D  LEU*     3.1    13.9    +      -       -      +
    101D  ASP*     3.3    19.7    -      -       -      +
    103D  LEU*     1.3    80.3    -      -       -      +
    105D  LEU*     1.3    60.1    +      -       +      +
    107D  ILE*     3.0     8.6    +      -       -      +
    108D  MET*     2.8    56.8    +      -       +      +
----------------------------------------------------------
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Residues in contact with LEU 105 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    101D  ASP      4.2     9.4    -      -       -      +
    102D  LEU*     3.3    26.0    -      -       +      +
    104D  GLU*     1.3    80.7    -      -       +      +
    106D  LEU*     1.3    61.8    +      -       +      +
    108D  MET*     3.9    25.5    -      -       +      +
    109D  HIS*     3.2    24.3    +      -       -      +
    120D  GLU*     4.9     8.7    -      -       -      +
    123D  ASN*     4.5     8.3    -      -       -      +
    124D  MET*     3.5    46.0    -      -       +      +
    127D  LYS*     4.4    14.6    -      -       +      -
----------------------------------------------------------
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Residues in contact with LEU 106 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    102D  LEU      4.8     2.9    -      -       -      +
    103D  LEU*     2.8    26.6    +      -       +      +
    105D  LEU*     1.3    82.4    -      -       +      +
    107D  ILE*     1.3    64.3    +      -       +      +
    109D  HIS*     3.2     4.0    -      -       -      +
    110D  PRO*     3.1    20.1    -      -       -      +
    124D  MET*     3.7    27.8    -      -       +      -
    163D  THR*     4.2     5.2    -      -       +      +
    166D  ALA*     3.5    37.9    -      -       +      +
    167D  LEU*     3.8    24.2    -      -       +      +
    170D  LYS*     4.2    21.1    +      -       +      +
----------------------------------------------------------
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Residues in contact with ILE 107 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     14D  GLY*     3.6    28.7    -      -       -      +
     15D  ARG*     4.0    51.4    -      -       +      +
     18D  SER*     6.0     0.7    -      -       -      +
    103D  LEU*     3.0    31.4    +      -       +      +
    104D  GLU*     3.3    15.0    -      -       -      +
    106D  LEU*     1.3    80.0    -      -       +      +
    108D  MET*     1.3    60.6    +      -       +      +
    110D  PRO*     3.5    11.7    -      -       -      +
    111D  PHE*     4.1    10.4    -      -       -      -
----------------------------------------------------------
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Residues in contact with MET 108 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     15D  ARG*     5.9     0.2    -      -       -      +
    104D  GLU*     2.8    49.3    +      -       +      +
    105D  LEU*     3.9    28.7    -      -       +      +
    107D  ILE*     1.3    73.9    -      -       +      +
    109D  HIS*     1.3    68.8    +      -       -      +
    110D  PRO*     3.2     2.5    -      -       -      -
    111D  PHE*     2.9    23.5    +      -       -      +
    112D  LEU*     3.8    18.8    -      -       +      +
    120D  GLU*     5.3     8.5    -      -       -      +
----------------------------------------------------------
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Residues in contact with HIS 109 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    105D  LEU      3.2    12.1    +      -       -      +
    106D  LEU      3.2    11.2    -      -       -      +
    108D  MET*     1.3    78.1    -      -       -      +
    110D  PRO*     1.3    68.9    -      -       +      +
    111D  PHE      2.9     1.7    +      -       -      -
    112D  LEU*     3.0    19.1    +      -       +      +
    117D  GLN*     2.9    69.2    +      -       +      +
    118D  GLN*     6.1     0.2    -      -       -      -
    120D  GLU*     4.2    11.7    -      -       +      -
    121D  VAL*     3.6    11.0    -      -       +      +
    124D  MET*     3.7    20.4    -      -       +      -
    170D  LYS*     2.7    32.8    +      -       -      +
----------------------------------------------------------
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Residues in contact with PRO 110 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    106D  LEU      3.1    11.4    -      -       -      +
    107D  ILE*     3.5     9.2    -      -       -      +
    108D  MET      3.2     4.7    -      -       -      -
    109D  HIS*     1.3   102.1    -      -       +      +
    111D  PHE*     1.3    72.0    +      -       +      +
    112D  LEU      3.2     5.6    +      -       -      +
    117D  GLN*     3.7    13.0    +      -       -      +
    170D  LYS*     5.2     2.5    -      -       -      +
    208D  PRO*     4.0    29.6    -      -       +      +
    212D  TYR*     5.8     0.2    -      -       +      -
    213D  VAL*     4.2    25.5    -      -       +      +
----------------------------------------------------------
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Residues in contact with PHE 111 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    107D  ILE      4.1    11.2    -      -       -      -
    108D  MET*     2.9    16.1    +      -       -      +
    110D  PRO*     1.3    96.1    -      -       +      +
    112D  LEU*     1.3    65.6    -      -       +      +
    113D  LYS*     4.0     6.2    +      -       -      +
    212D  TYR*     4.2    21.3    -      +       -      -
    213D  VAL*     3.9    22.7    -      -       +      -
    216D  VAL*     3.7    31.9    -      -       +      -
    217D  TYR*     3.5    40.1    +      +       -      +
----------------------------------------------------------
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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