Contacts of the helix formed by residues 90 - 115 (chain D) in PDB entry 4GTU


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 GLU 90 (chain D).
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     67C  HIS*     3.9    16.6    -      -       +      +
     78C  TYR*     3.4    18.0    -      -       -      +
     81C  ARG*     2.7    36.9    +      -       -      +
     82C  LYS*     5.4     7.5    -      -       -      +
     89D  THR*     1.3    74.6    -      -       -      +
     91D  GLU*     1.3    67.5    +      -       -      +
     93D  LYS*     3.0    18.4    +      -       -      +
     94D  ILE*     2.9    39.2    +      -       +      +
----------------------------------------------------------
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Residues in contact with GLU 91 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     67C  HIS*     5.5     3.5    +      -       -      +
     89D  THR*     3.5     6.1    +      -       -      +
     90D  GLU*     1.3    77.2    -      -       -      +
     92D  GLU*     1.3    65.3    +      -       +      +
     94D  ILE*     3.4     9.6    +      -       -      +
     95D  ARG*     2.9    59.6    +      -       +      +
    144D  ARG*     4.2    12.3    +      -       -      -
    148D  VAL      5.2     5.2    -      -       -      -
----------------------------------------------------------
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Residues in contact with GLU 92 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     87D  GLY*     4.1     3.9    -      -       -      -
     88D  GLU*     2.8    56.0    +      -       -      +
     89D  THR*     3.1    22.3    +      -       -      +
     90D  GLU      3.2     0.4    -      -       -      -
     91D  GLU*     1.3    79.3    -      -       +      +
     93D  LYS*     1.3    63.9    +      -       -      +
     95D  ARG      3.1     1.6    +      -       -      -
     96D  VAL*     2.9    29.6    +      -       -      +
    148D  VAL*     3.5    32.7    -      -       +      +
    151D  LYS*     4.6    17.4    -      -       -      +
    153D  THR*     5.7     0.4    -      -       +      -
----------------------------------------------------------
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Residues in contact with LYS 93 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     81C  ARG*     3.1    37.8    +      -       -      +
     87D  GLY*     4.2    22.3    +      -       -      +
     88D  GLU      3.6    18.8    -      -       -      -
     89D  THR      3.0    17.0    +      -       -      +
     90D  GLU*     3.0    24.1    +      -       -      +
     92D  GLU*     1.3    78.8    -      -       -      +
     94D  ILE*     1.3    56.8    +      -       -      +
     96D  VAL*     3.4     4.7    +      -       -      +
     97D  ASP*     2.8    25.6    +      -       -      +
----------------------------------------------------------
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Residues in contact with ILE 94 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     67C  HIS*     3.7    29.4    -      -       +      +
     68C  LYS      5.7     0.2    -      -       -      +
     69C  ILE*     3.7    31.4    -      -       +      -
     74C  ALA      6.0     0.4    -      -       -      +
     78C  TYR*     4.0     7.4    -      -       +      -
     81C  ARG*     3.5    12.8    -      -       -      +
     90D  GLU*     2.9    51.7    +      -       +      +
     91D  GLU*     3.8     6.1    -      -       -      +
     93D  LYS*     1.3    71.7    -      -       -      +
     95D  ARG*     1.3    59.8    +      -       +      +
     97D  ASP*     3.1     3.5    -      -       +      +
     98D  ILE*     2.8    38.8    +      -       +      +
----------------------------------------------------------
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Residues in contact with ARG 95 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     55C  ASP*     4.3     8.7    +      -       -      -
     91D  GLU*     2.9    49.3    +      -       +      +
     92D  GLU      3.6     3.1    -      -       -      +
     94D  ILE*     1.3    73.9    -      -       +      +
     96D  VAL*     1.3    65.7    +      -       -      +
     98D  ILE*     4.9     1.1    -      -       -      -
     99D  LEU*     3.1    27.5    +      -       -      +
    139D  GLN      5.4     1.0    +      -       -      -
    140D  PHE*     3.0    67.4    +      -       +      +
    144D  ARG*     3.2    28.6    -      -       -      +
    147D  PHE      3.3    23.0    +      -       -      +
    148D  VAL*     4.2    19.7    -      -       +      -
    155D  VAL*     5.0     1.2    -      -       -      +
----------------------------------------------------------
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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
----------------------------------------------------------
     86D  CYS      3.5    22.9    -      -       -      +
     92D  GLU      2.9    21.7    +      -       -      +
     93D  LYS*     3.8     4.3    -      -       -      +
     95D  ARG*     1.3    74.5    -      -       -      +
     97D  ASP*     1.3    70.0    +      -       -      +
    100D  GLU*     3.0    22.1    +      -       -      +
    148D  VAL*     3.6    17.9    -      -       +      -
    153D  THR*     3.7    11.4    -      -       +      +
    154D  PHE*     3.3    31.4    -      -       +      -
    155D  VAL*     3.3    29.0    -      -       +      +
----------------------------------------------------------
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Residues in contact with ASP 97 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     74C  ALA*     3.3    21.5    +      -       +      +
     77C  CYS*     2.9    39.9    -      -       -      +
     81C  ARG*     2.6    26.9    +      -       -      +
     93D  LYS      2.8    12.5    +      -       -      +
     94D  ILE*     3.1    11.2    -      -       +      +
     96D  VAL*     1.3    80.7    -      -       -      +
     98D  ILE*     1.3    60.9    +      -       -      +
    100D  GLU*     3.2    25.5    -      -       -      +
    101D  ASN*     3.2    16.1    +      -       -      -
----------------------------------------------------------
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Residues in contact with ILE 98 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     55C  ASP*     4.6     9.4    -      -       +      +
     56C  PHE*     4.1    26.0    -      -       +      -
     68C  LYS      4.3     6.3    -      -       -      +
     69C  ILE*     3.5    18.4    -      -       +      -
     70C  THR*     3.4    39.7    -      -       -      +
     74C  ALA*     3.6    24.0    -      -       +      +
     94D  ILE*     2.8    23.4    +      -       +      +
     95D  ARG*     4.5     1.3    -      -       -      +
     97D  ASP*     1.3    71.3    -      -       -      +
     99D  LEU*     1.3    68.6    +      -       -      +
    101D  ASN*     3.3     3.3    +      -       -      +
    102D  GLN*     3.0    25.5    +      -       +      +
    140D  PHE*     4.5    11.7    -      -       +      -
----------------------------------------------------------
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Residues in contact with LEU 99 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     56C  PHE*     4.2     5.6    -      -       +      -
     95D  ARG      3.1    21.0    +      -       -      +
     96D  VAL      4.0     1.3    -      -       -      +
     98D  ILE*     1.3    79.9    -      -       -      +
    100D  GLU*     1.3    54.5    +      -       -      +
    102D  GLN*     3.1     3.2    +      -       +      +
    103D  ALA*     2.6    49.8    +      -       +      +
    137D  PHE*     3.6    29.4    -      -       +      -
    140D  PHE*     3.8    28.5    -      -       +      -
    147D  PHE*     3.9    13.7    -      -       +      -
    155D  VAL*     3.7    36.6    -      -       +      +
    158D  LEU*     5.2     0.2    -      -       +      -
    159D  ALA*     4.3    11.0    -      -       +      -
----------------------------------------------------------
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Residues in contact with GLU 100 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    100C  GLU*     5.2     7.2    -      -       -      +
     73D  ASN*     3.4    29.1    +      -       -      +
     77D  CYS*     4.0    10.0    -      -       -      -
     96D  VAL*     3.0    14.0    +      -       -      +
     97D  ASP*     3.2    25.2    -      -       -      +
     99D  LEU*     1.3    76.2    -      -       -      +
    101D  ASN*     1.3    72.8    +      -       -      +
    103D  ALA*     3.9     0.8    -      -       -      +
    104D  MET*     3.2    30.7    +      -       -      +
    154D  PHE*     3.4    28.8    -      -       -      -
    155D  VAL*     3.9     6.7    -      -       +      -
    158D  LEU*     3.8    24.9    -      -       +      +
----------------------------------------------------------
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Residues in contact with ASN 101 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     71C  GLN*     3.2    47.2    +      -       +      +
     73C  ASN*     3.0    37.3    +      -       -      +
     74C  ALA*     3.1    26.8    -      -       -      +
    100C  GLU*     5.1     1.4    +      -       -      -
     73D  ASN*     5.4     1.6    -      -       -      +
     97D  ASP*     3.2    19.1    +      -       -      +
     98D  ILE      3.6     6.1    -      -       -      +
     99D  LEU      3.2     0.4    -      -       -      -
    100D  GLU*     1.3    89.3    +      -       -      +
    102D  GLN*     1.3    59.2    +      -       -      +
    104D  MET*     4.5     3.2    -      -       -      +
    105D  ASP*     3.6    13.7    +      -       -      +
----------------------------------------------------------
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Residues in contact with GLN 102 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     56C  PHE*     3.5    47.0    -      -       +      +
     58C  ASN*     3.7    26.2    +      -       -      +
     70C  THR      4.4     3.9    +      -       -      +
     71C  GLN*     2.9    36.7    +      -       +      +
     98D  ILE*     3.0    20.7    +      -       +      +
     99D  LEU*     3.8     5.8    -      -       +      +
    101D  ASN*     1.3    75.8    -      -       -      +
    103D  ALA*     1.3    65.8    +      -       -      +
    104D  MET      3.1     1.6    -      -       -      -
    105D  ASP*     2.8    23.5    +      -       -      +
    106D  VAL*     2.9    22.2    +      -       +      +
    137D  PHE*     5.7     2.0    -      -       +      -
----------------------------------------------------------
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Residues in contact with ALA 103 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     99D  LEU*     2.6    32.6    +      -       +      +
    100D  GLU*     3.9     4.5    -      -       -      +
    102D  GLN*     1.3    72.2    -      -       -      +
    104D  MET*     1.3    60.9    +      -       -      +
    106D  VAL*     3.4     7.0    +      -       -      +
    107D  SER*     2.9    24.0    +      -       -      -
    137D  PHE*     4.7     8.0    -      -       +      -
    158D  LEU*     4.1    24.7    -      -       +      +
    159D  ALA*     5.0     0.7    -      -       -      +
    162D  VAL*     3.6    24.0    -      -       +      +
----------------------------------------------------------
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Residues in contact with MET 104 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     12D  LEU*     4.2    20.2    -      -       +      -
     72D  SER*     3.7    26.5    -      -       -      +
     73D  ASN*     3.5    42.0    -      -       -      +
    100D  GLU      3.2     9.3    +      -       -      +
    101D  ASN*     4.5     4.0    -      -       -      +
    102D  GLN      3.1     0.6    -      -       -      -
    103D  ALA*     1.3    80.5    -      -       -      +
    105D  ASP*     1.3    56.0    +      -       -      +
    107D  SER*     2.9    13.8    +      -       -      -
    108D  ASN*     2.8    39.1    +      -       -      +
    158D  LEU*     4.2    18.4    -      -       +      -
----------------------------------------------------------
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Residues in contact with ASP 105 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     58C  ASN*     4.9     3.8    +      -       -      -
     71C  GLN*     3.1    25.4    +      -       -      -
    101D  ASN      3.6     8.9    +      -       -      +
    102D  GLN*     2.8    23.7    +      -       -      +
    104D  MET*     1.3    79.5    -      -       -      +
    106D  VAL*     1.3    55.9    +      -       +      +
    108D  ASN*     3.6    11.1    +      -       -      +
    109D  GLN*     3.0    47.0    +      -       -      +
----------------------------------------------------------
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Residues in contact with VAL 106 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    102D  GLN*     2.9    20.8    +      -       +      +
    103D  ALA*     3.7     5.6    -      -       -      +
    105D  ASP*     1.3    73.9    -      -       +      +
    107D  SER*     1.3    66.3    +      -       -      +
    109D  GLN*     3.1    12.4    +      -       +      +
    110D  LEU*     3.0    21.7    +      -       -      +
    126D  TYR*     3.7     9.7    +      -       -      +
    133D  MET*     4.4    15.9    -      -       +      -
    134D  MET*     6.1     1.8    -      -       -      -
    137D  PHE*     4.1    25.1    -      -       +      -
    162D  VAL*     4.0     9.9    -      -       +      -
    166D  HIS*     3.4    28.0    -      -       +      -
----------------------------------------------------------
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Residues in contact with SER 107 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     12D  LEU*     5.5     8.1    -      -       -      -
    103D  ALA      2.9    13.5    +      -       -      -
    104D  MET*     2.9    21.2    +      -       -      -
    106D  VAL*     1.3    78.9    -      -       -      +
    108D  ASN*     1.3    62.3    +      -       -      +
    110D  LEU*     3.0     7.7    +      -       -      +
    111D  ALA*     2.8    29.7    +      -       -      +
    161D  ASP*     5.3     2.8    +      -       -      -
    162D  VAL*     3.8    15.4    -      -       -      +
    165D  LEU*     5.1    12.6    -      -       -      +
    166D  HIS*     5.7     0.9    -      -       -      -
    208D  TYR*     3.9     3.8    +      -       -      -
----------------------------------------------------------
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Residues in contact with ASN 108 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    112C  ARG*     5.1     6.4    +      -       -      +
     12D  LEU*     6.0     3.6    -      -       -      +
    104D  MET*     2.8    28.6    +      -       -      +
    105D  ASP*     4.0    10.3    -      -       -      +
    107D  SER*     1.3    76.6    -      -       -      +
    109D  GLN*     1.3    57.8    +      -       -      +
    111D  ALA*     4.3     8.5    -      -       -      +
    112D  ARG*     2.8    56.8    +      -       -      +
----------------------------------------------------------
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Residues in contact with GLN 109 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    105D  ASP*     3.0    44.1    +      -       -      +
    106D  VAL*     3.1    13.1    +      -       -      +
    108D  ASN*     1.3    77.5    -      -       +      +
    110D  LEU*     1.3    57.8    +      -       -      +
    112D  ARG*     4.4    15.6    -      -       -      +
    113D  VAL*     3.8    17.8    +      -       -      +
    126D  TYR*     4.0    34.4    +      -       +      -
    133D  MET*     4.4    10.2    -      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 110 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    106D  VAL      3.0    10.0    +      -       -      +
    107D  SER*     3.0     9.4    +      -       -      +
    109D  GLN*     1.3    78.1    -      -       -      +
    111D  ALA*     1.3    65.0    +      -       -      +
    112D  ARG      3.3     0.2    -      -       -      -
    113D  VAL*     3.3     5.3    +      -       +      +
    114D  CYS*     3.0    37.2    +      -       -      -
    126D  TYR*     3.9    18.4    -      -       +      -
    165D  LEU*     4.1    33.4    -      -       +      +
    166D  HIS*     4.2    18.6    -      -       +      +
    169D  PHE*     3.6    33.7    -      -       +      -
    208D  TYR*     3.5    14.8    -      -       +      +
    214D  TRP*     4.4    12.1    -      -       +      -
----------------------------------------------------------
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Residues in contact with ALA 111 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    112C  ARG*     6.2     0.7    -      -       -      +
    107D  SER      2.8    15.9    +      -       -      +
    108D  ASN*     4.0    10.5    -      -       -      +
    110D  LEU*     1.3    75.8    -      -       -      +
    112D  ARG*     1.3    64.6    +      -       -      +
    114D  CYS*     3.1     2.9    +      -       -      +
    115D  TYR*     2.9    39.7    +      -       +      -
    208D  TYR*     3.2    34.4    +      -       +      -
----------------------------------------------------------
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Residues in contact with ARG 112 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    108C  ASN*     5.2    12.9    +      -       -      +
    112C  ARG*     3.1    58.2    -      -       -      +
    108D  ASN*     2.8    48.8    +      -       -      +
    109D  GLN*     4.5    13.6    -      -       -      +
    111D  ALA*     1.3    71.9    -      -       -      +
    113D  VAL*     1.3    64.1    +      -       -      +
    115D  TYR*     3.1    14.7    +      -       -      +
    116D  SER*     3.0    21.2    +      -       -      +
----------------------------------------------------------
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Residues in contact with VAL 113 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    109D  GLN      3.8    11.7    +      -       -      +
    110D  LEU*     3.3    20.8    +      -       +      +
    111D  ALA      3.2     0.6    -      -       -      -
    112D  ARG*     1.3    79.9    -      -       -      +
    114D  CYS*     1.3    70.6    +      -       -      +
    116D  SER*     3.1    28.9    +      -       -      +
    119D  PHE*     4.4    18.3    -      -       +      -
    122D  LEU*     3.7    43.9    -      -       +      +
    123D  LYS*     5.2     5.8    -      -       -      +
    125D  GLU*     5.9     0.2    -      -       -      +
    126D  TYR*     4.3    15.0    -      -       +      -
    169D  PHE*     5.0     6.1    -      -       +      -
----------------------------------------------------------
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Residues in contact with CYS 114 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    110D  LEU*     3.0    29.8    +      -       -      +
    111D  ALA      3.1     4.5    +      -       -      +
    113D  VAL*     1.3    89.5    -      -       -      +
    115D  TYR*     1.3    63.2    +      -       +      +
    116D  SER      3.2     1.6    -      -       -      -
    119D  PHE*     4.4     5.8    -      -       -      -
    169D  PHE*     5.0     1.1    -      -       -      -
    208D  TYR*     4.1    11.7    -      -       +      -
    212D  ALA*     3.9     0.2    -      -       -      +
    213D  VAL*     3.1    36.8    +      -       -      +
    214D  TRP*     3.0    55.0    -      -       +      +
----------------------------------------------------------
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Residues in contact with TYR 115 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    112C  ARG*     6.0     2.5    -      -       -      -
    111D  ALA*     2.9    25.7    +      -       +      +
    112D  ARG*     3.1     7.7    +      -       -      +
    114D  CYS*     1.3    77.9    -      -       -      +
    116D  SER*     1.3    60.1    +      -       -      +
    117D  PRO*     4.0     5.5    -      -       -      +
    208D  TYR*     3.4    32.1    -      +       +      +
    209D  THR*     3.0    27.6    +      -       -      +
    211D  VAL*     4.8    10.1    -      -       +      -
    212D  ALA*     3.2    37.9    -      -       +      +
    213D  VAL*     5.4     0.2    -      -       -      -
----------------------------------------------------------
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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