Contacts of the helix formed by residues 92 - 119 (chain D) in PDB entry 1IES


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 THR 92 (chain D).
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     37D  PHE*     3.9    10.7    -      -       -      -
     44D  LEU*     3.8     5.0    -      -       -      +
     47D  VAL*     3.8    34.7    -      -       +      +
     91D  THR*     1.3    69.9    -      -       -      +
     93D  LEU*     1.3    52.7    +      -       -      +
     95D  ALA*     3.2     1.7    +      -       +      +
     96D  MET*     2.7    42.3    +      -       +      +
    151D  ILE*     3.6    24.9    -      -       +      -
    163D  GLU*     2.8    37.4    +      -       -      +
    166D  PHE*     4.3    15.0    -      -       +      -
----------------------------------------------------------
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Residues in contact with LEU 93 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     91D  THR*     3.1     8.5    +      -       -      +
     92D  THR*     1.3    76.5    -      -       -      +
     94D  ASP*     1.3    68.0    +      -       -      +
     96D  MET*     3.9     0.3    -      -       -      +
     97D  LYS*     3.0    45.0    +      -       +      +
    148D  LEU*     3.5    28.0    -      -       +      -
    151D  ILE*     4.2    25.8    -      -       +      +
    152D  GLN*     3.8    32.8    -      -       +      +
    155D  VAL*     4.6    20.2    -      -       +      -
    163D  GLU*     5.6     0.8    -      -       -      +
----------------------------------------------------------
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Residues in contact with ASP 94 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     89D  TRP      3.5    16.8    -      -       -      +
     90D  GLY*     3.8     6.0    -      -       -      -
     91D  THR*     2.8    30.0    +      -       -      +
     93D  LEU*     1.3    83.8    -      -       -      +
     95D  ALA*     1.4    55.6    +      -       -      +
     97D  LYS*     3.3    12.7    +      -       -      +
     98D  ALA*     3.0    29.0    +      -       -      +
----------------------------------------------------------
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Residues in contact with ALA 95 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     33D  LEU*     3.8    20.1    -      -       +      +
     37D  PHE*     3.5    30.3    -      -       +      -
     51D  PHE*     3.8    12.5    -      -       +      -
     89D  TRP*     3.9     6.1    +      -       -      +
     91D  THR      2.8    17.6    +      -       -      +
     92D  THR*     3.4     7.4    -      -       -      +
     94D  ASP*     1.4    71.1    -      -       -      +
     96D  MET*     1.3    63.2    +      -       -      +
     98D  ALA*     3.2     7.1    +      -       -      +
     99D  ALA*     2.9    22.0    +      -       -      +
----------------------------------------------------------
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Residues in contact with MET 96 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     47D  VAL*     5.5     0.4    -      -       +      -
     50D  PHE*     3.6    39.7    -      -       +      -
     51D  PHE*     4.2     9.6    -      -       +      -
     92D  THR*     2.7    30.4    +      -       +      +
     93D  LEU      3.9     0.4    -      -       -      +
     95D  ALA*     1.3    71.6    -      -       -      +
     97D  LYS*     1.3    58.7    +      -       -      +
     99D  ALA*     3.2     4.4    +      -       -      +
    100D  ILE*     2.8    31.7    +      -       -      +
    144D  MET*     4.6    12.4    -      -       +      +
    147D  HIS*     3.9    30.7    -      -       +      -
    148D  LEU*     3.6    23.1    -      -       +      +
    151D  ILE*     3.4    23.8    -      -       +      -
    166D  PHE*     4.6     5.6    -      -       +      -
    171D  LEU*     5.0     3.6    -      -       +      -
----------------------------------------------------------
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Residues in contact with LYS 97 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     93D  LEU*     3.0    37.7    +      -       +      +
     94D  ASP*     3.5    12.0    +      -       -      +
     96D  MET*     1.3    76.4    -      -       -      +
     98D  ALA*     1.3    62.3    +      -       -      +
    100D  ILE*     3.2    10.4    -      -       +      +
    101D  VAL*     3.2    30.3    +      -       +      +
    148D  LEU*     3.6    15.5    -      -       +      -
    152D  GLN*     3.7    26.6    -      -       -      +
----------------------------------------------------------
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Residues in contact with ALA 98 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     33D  LEU*     5.3     3.8    -      -       +      -
     86D  GLN*     5.3     4.0    -      -       -      +
     89D  TRP*     4.3    28.9    -      -       +      -
     94D  ASP      3.0    13.7    +      -       -      +
     95D  ALA      3.2     9.2    +      -       -      +
     97D  LYS*     1.3    74.6    -      -       -      +
     99D  ALA*     1.3    58.7    -      -       -      +
    101D  VAL*     3.4     9.2    -      -       -      +
    102D  LEU*     3.0    27.0    +      -       -      +
----------------------------------------------------------
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Residues in contact with ALA 99 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     30D  TYR*     3.7    21.1    -      -       +      +
     33D  LEU*     5.0     2.9    -      -       +      +
     51D  PHE*     3.7    23.3    -      -       +      -
     95D  ALA      2.9    12.7    +      -       -      +
     96D  MET*     3.2    10.3    +      -       -      +
     98D  ALA*     1.3    73.6    -      -       -      +
    100D  ILE*     1.3    62.8    +      -       -      +
    102D  LEU*     2.8     9.1    +      -       -      +
    103D  GLU*     2.8    28.8    +      -       -      +
    144D  MET*     3.9    13.0    -      -       +      -
----------------------------------------------------------
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Residues in contact with ILE 100 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     96D  MET      2.8    17.7    +      -       -      +
     97D  LYS*     3.2    14.8    -      -       +      +
     99D  ALA*     1.3    71.4    -      -       -      +
    101D  VAL*     1.3    63.2    +      -       +      +
    103D  GLU*     3.4     2.7    +      -       -      +
    104D  LYS*     2.9    44.1    +      -       +      +
    141D  ILE*     4.1    10.1    -      -       +      -
    144D  MET*     4.0    18.8    -      -       +      -
    145D  GLY*     4.1    10.5    -      -       -      +
    148D  LEU*     4.0    27.4    -      -       +      -
      3F  GLN*     4.3    16.6    -      -       +      +
      4F  ILE*     4.1    25.8    -      -       +      -
----------------------------------------------------------
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Residues in contact with VAL 101 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     97D  LYS*     3.2    16.6    +      -       +      +
     98D  ALA*     3.4    11.2    -      -       -      +
    100D  ILE*     1.3    80.0    -      -       +      +
    102D  LEU*     1.3    64.2    +      -       -      +
    104D  LYS*     3.3     8.4    +      -       -      +
    105D  SER*     3.0    23.9    +      -       -      -
----------------------------------------------------------
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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
----------------------------------------------------------
     25D  ARG*     5.5     7.0    -      -       -      +
     26D  ALA*     4.1    25.8    -      -       +      +
     29D  THR*     3.7    30.3    -      -       +      +
     30D  TYR*     3.7    33.9    -      -       +      +
     33D  LEU*     5.5     0.4    -      -       +      -
     98D  ALA      3.0    13.3    +      -       -      +
     99D  ALA*     2.8    11.0    +      -       -      +
    101D  VAL*     1.3    77.2    -      -       -      +
    103D  GLU*     1.3    61.8    +      -       -      +
    105D  SER*     2.8    28.3    +      -       -      +
    106D  LEU*     3.1    12.6    +      -       +      +
----------------------------------------------------------
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Residues in contact with GLU 103 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     30D  TYR*     2.6    31.2    +      -       -      +
     58D  LYS*     2.8    37.5    +      -       -      -
     99D  ALA      2.8    14.2    +      -       -      +
    100D  ILE*     3.8     7.0    -      -       -      +
    102D  LEU*     1.3    72.6    -      -       -      +
    104D  LYS*     1.3    54.4    +      -       -      +
    106D  LEU*     3.1    10.5    +      -       -      +
    107D  ASN*     2.7    35.5    +      -       -      +
    137D  GLU*     2.7    29.8    -      -       -      +
    140D  LEU*     3.5    15.9    -      -       +      +
    141D  ILE*     3.8    15.0    -      -       +      -
    144D  MET*     3.9    16.4    -      -       -      -
----------------------------------------------------------
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Residues in contact with LYS 104 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    100D  ILE*     2.9    36.7    +      -       +      +
    101D  VAL*     3.4     8.9    -      -       -      +
    103D  GLU*     1.3    75.8    -      -       -      +
    105D  SER*     1.3    56.7    +      -       -      +
    107D  ASN*     3.3     1.0    +      -       -      -
    108D  GLN*     2.9    14.6    +      -       -      +
    141D  ILE*     4.2    10.1    -      -       +      -
      3F  GLN      3.1    29.3    +      -       -      -
      4F  ILE*     3.9    18.6    -      -       -      +
      5F  ARG      4.7     7.2    +      -       -      -
      6F  GLN*     2.9    46.5    +      -       +      +
----------------------------------------------------------
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Residues in contact with SER 105 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     22D  LEU*     4.9     3.2    -      -       -      +
    101D  VAL*     3.0    13.4    +      -       -      -
    102D  LEU*     2.8    28.7    +      -       -      +
    104D  LYS*     1.3    71.3    -      -       -      +
    106D  LEU*     1.3    63.3    +      -       -      +
    108D  GLN*     3.3     7.9    +      -       -      +
    109D  ALA*     2.9    27.9    +      -       -      +
----------------------------------------------------------
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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
----------------------------------------------------------
     19D  LEU*     4.8     0.3    -      -       -      +
     22D  LEU*     4.0    42.0    -      -       +      +
     23D  TYR*     4.1    21.3    -      -       +      +
     26D  ALA*     3.9    22.9    -      -       +      -
     58D  LYS*     3.9    18.2    -      -       +      +
    102D  LEU*     3.1    12.2    +      -       +      +
    103D  GLU*     3.4    29.6    -      -       -      +
    105D  SER*     1.3    83.2    +      -       -      +
    107D  ASN*     1.3    63.8    +      -       -      +
    109D  ALA*     3.1     8.3    +      -       -      +
    110D  LEU*     3.0    26.7    +      -       -      +
    137D  GLU*     4.7     4.3    -      -       -      +
----------------------------------------------------------
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Residues in contact with ASN 107 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    103D  GLU      2.7    19.1    +      -       -      +
    104D  LYS      3.5     0.4    -      -       -      +
    106D  LEU*     1.3    74.0    -      -       -      +
    108D  GLN*     1.3    62.4    +      -       -      +
    110D  LEU*     3.2    11.6    +      -       -      +
    111D  LEU*     2.9    37.3    +      -       -      +
    134D  LEU*     4.5     8.1    +      -       -      +
    137D  GLU*     3.3    33.5    -      -       +      +
    138D  VAL*     4.7    10.3    -      -       -      +
    141D  ILE*     4.0     8.5    -      -       +      +
      6F  GLN*     3.0    31.5    -      -       -      +
     72F  ARG*     5.8     1.0    +      -       -      -
----------------------------------------------------------
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Residues in contact with GLN 108 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    104D  LYS      2.9    13.7    +      -       -      +
    105D  SER*     3.6    11.0    -      -       -      +
    107D  ASN*     1.3    75.0    -      -       -      +
    109D  ALA*     1.3    53.9    +      -       -      +
    111D  LEU*     3.2    21.3    +      -       -      +
    112D  ASP*     2.8    65.6    +      -       -      +
      6F  GLN*     3.6    19.0    +      -       -      +
      7F  ASN*     5.6     1.4    -      -       -      +
----------------------------------------------------------
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Residues in contact with ALA 109 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     19D  LEU*     3.5    24.4    -      -       +      +
     22D  LEU*     3.6    21.5    -      -       +      -
    105D  SER      2.9    10.4    +      -       -      +
    106D  LEU      3.3     9.0    -      -       -      +
    108D  GLN*     1.3    75.7    -      -       -      +
    110D  LEU*     1.3    55.6    +      -       -      +
    112D  ASP*     3.4     8.2    +      -       -      +
    113D  LEU*     2.9    28.4    +      -       -      +
----------------------------------------------------------
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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
----------------------------------------------------------
     19D  LEU*     3.6    24.5    -      -       +      -
     23D  TYR*     3.7    23.6    -      -       +      +
    106D  LEU      3.0    16.8    +      -       -      +
    107D  ASN*     3.5     8.7    -      -       -      +
    109D  ALA*     1.3    71.5    -      -       -      +
    111D  LEU*     1.3    58.2    +      -       -      +
    113D  LEU*     3.2     5.8    +      -       -      +
    114D  HIS*     2.7    36.8    +      -       -      +
    129D  LEU*     4.1    11.9    -      -       +      +
    133D  PHE*     3.7    38.6    -      -       +      +
    134D  LEU*     3.7    16.4    -      -       +      -
    137D  GLU*     4.0    25.4    -      -       +      -
----------------------------------------------------------
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Residues in contact with LEU 111 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    107D  ASN*     2.9    33.0    +      -       -      +
    108D  GLN*     3.3    30.5    -      -       -      +
    110D  LEU*     1.3    77.6    -      -       -      +
    112D  ASP*     1.3    61.3    +      -       -      +
    114D  HIS*     3.5     5.3    +      -       -      +
    115D  ALA*     3.1    21.3    +      -       -      +
    134D  LEU*     4.3    15.3    -      -       +      -
      6F  GLN*     4.7     5.6    -      -       +      +
      7F  ASN*     3.7    37.7    -      -       +      +
    123F  PRO*     3.7    27.3    -      -       +      +
    124F  HIS*     5.7     1.6    -      -       +      +
----------------------------------------------------------
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Residues in contact with ASP 112 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    108D  GLN*     2.8    54.6    +      -       -      +
    109D  ALA*     3.6     8.1    -      -       -      +
    111D  LEU*     1.3    72.2    -      -       -      +
    113D  LEU*     1.3    61.4    +      -       -      +
    115D  ALA*     3.0     9.5    +      -       -      +
    116D  LEU*     3.0    20.5    +      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 113 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     12D  VAL*     4.3     7.6    -      -       +      -
     15D  ALA*     3.7    27.8    -      -       +      +
     16D  VAL*     4.2    21.5    -      -       +      +
     19D  LEU*     3.6    28.7    -      -       +      -
     65D  LEU*     5.2     1.3    -      -       +      -
    109D  ALA      2.9    17.9    +      -       -      +
    110D  LEU*     3.7     4.5    -      -       -      +
    112D  ASP*     1.3    74.2    -      -       -      +
    114D  HIS*     1.3    63.6    +      -       -      +
    116D  LEU*     3.1    15.6    +      -       +      +
    117D  GLY*     2.9    20.1    +      -       -      -
    125D  LEU*     3.7    18.0    -      -       +      +
    129D  LEU*     3.7    22.7    -      -       +      -
----------------------------------------------------------
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Residues in contact with HIS 114 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    110D  LEU      2.7    21.8    +      -       -      +
    111D  LEU*     3.5     9.2    -      -       -      +
    113D  LEU*     1.3    74.0    -      -       -      +
    115D  ALA*     1.3    57.3    +      -       -      +
    117D  GLY*     3.3     2.6    +      -       -      -
    118D  SER*     2.9    32.6    +      -       -      -
    126D  CYS*     3.7    32.8    -      -       +      +
    129D  LEU*     3.7    14.0    -      -       +      +
    130D  GLU*     2.8    32.7    +      -       +      +
    134D  LEU*     3.9    15.5    -      -       +      -
    123F  PRO*     3.5    33.6    -      -       +      +
----------------------------------------------------------
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Residues in contact with ALA 115 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    111D  LEU      3.1    12.7    +      -       -      +
    112D  ASP*     3.0    13.7    +      -       -      +
    114D  HIS*     1.3    73.6    +      -       -      +
    116D  LEU*     1.3    65.7    +      -       -      +
    118D  SER*     3.1    10.2    +      -       -      -
    119D  ALA*     2.9    23.8    +      -       -      +
    121F  ALA*     6.3     2.7    -      -       +      -
----------------------------------------------------------
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Residues in contact with LEU 116 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     11D  GLU*     3.8    43.1    -      -       +      +
     12D  VAL*     3.9     8.5    -      -       +      -
     15D  ALA*     3.8    19.3    -      -       +      -
     18D  ARG*     5.6     2.2    -      -       -      +
    112D  ASP      3.0    10.9    +      -       -      +
    113D  LEU*     3.3    11.7    -      -       +      +
    115D  ALA*     1.3    75.7    -      -       -      +
    117D  GLY*     1.3    52.0    +      -       -      +
    119D  ALA*     3.0     9.5    +      -       +      +
    120D  GLN*     2.8    63.7    +      -       +      +
----------------------------------------------------------
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Residues in contact with GLY 117 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     12D  VAL*     4.5     4.0    -      -       -      +
    113D  LEU      2.9    10.5    +      -       -      -
    114D  HIS      3.6     2.9    -      -       -      -
    116D  LEU*     1.3    75.2    -      -       -      +
    118D  SER*     1.3    53.6    +      -       -      +
    120D  GLN*     3.6     0.6    +      -       -      -
    121D  ALA      3.1     6.9    +      -       -      -
    122D  ASP*     2.7    37.3    +      -       -      +
    125D  LEU*     3.5    26.6    -      -       -      +
    126D  CYS*     3.6     8.7    -      -       -      -
----------------------------------------------------------
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Residues in contact with SER 118 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    114D  HIS*     2.9    25.8    +      -       -      -
    115D  ALA*     3.1    14.4    +      -       -      -
    117D  GLY*     1.3    73.9    -      -       -      +
    119D  ALA*     1.3    61.3    +      -       -      +
    121D  ALA*     3.2    13.2    +      -       -      +
    122D  ASP      4.8     0.2    -      -       -      +
    126D  CYS*     3.4    11.5    -      -       -      -
----------------------------------------------------------
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Residues in contact with ALA 119 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    115D  ALA      2.9    13.6    +      -       -      +
    116D  LEU*     3.4    13.5    -      -       +      +
    118D  SER*     1.3    75.8    -      -       -      +
    120D  GLN*     1.3    67.6    +      -       +      +
    121D  ALA*     3.2     2.9    +      -       -      +
----------------------------------------------------------
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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