Contacts of the helix formed by residues 92 - 119 (chain F) 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 F).
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     37F  PHE*     4.0    10.8    -      -       -      -
     44F  LEU*     4.0     5.7    -      -       -      +
     47F  VAL*     3.9    34.9    -      -       +      +
     91F  THR*     1.3    70.1    -      -       -      +
     93F  LEU*     1.3    57.2    +      -       -      +
     95F  ALA*     3.3     1.5    +      -       -      +
     96F  MET*     2.7    36.3    +      -       +      +
    151F  ILE*     3.6    26.5    -      -       +      -
    163F  GLU*     2.7    32.7    +      -       -      +
    166F  PHE*     4.1    15.5    -      -       +      -
----------------------------------------------------------
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Residues in contact with LEU 93 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     91F  THR*     3.1     9.4    +      -       -      +
     92F  THR*     1.3    77.5    -      -       -      +
     94F  ASP*     1.3    67.8    +      -       -      +
     96F  MET*     3.9     0.5    -      -       -      -
     97F  LYS*     3.0    48.6    +      -       +      +
    148F  LEU*     3.5    27.4    -      -       +      -
    151F  ILE*     4.1    26.3    -      -       +      +
    152F  GLN*     3.8    28.7    -      -       +      +
    155F  VAL*     4.4    21.5    -      -       +      -
    163F  GLU*     5.6     0.8    -      -       -      +
----------------------------------------------------------
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Residues in contact with ASP 94 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     89F  TRP      3.6    15.9    -      -       -      +
     90F  GLY*     4.0     5.4    -      -       -      -
     91F  THR*     2.8    30.0    +      -       -      +
     93F  LEU*     1.3    82.3    -      -       -      +
     95F  ALA*     1.3    63.3    +      -       -      +
     97F  LYS*     3.3    14.3    +      -       -      +
     98F  ALA*     3.0    23.6    +      -       -      +
----------------------------------------------------------
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Residues in contact with ALA 95 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     33F  LEU*     3.7    20.5    -      -       +      +
     37F  PHE*     3.6    30.1    -      -       +      -
     51F  PHE*     3.8    11.0    -      -       +      -
     89F  TRP*     3.8     7.0    +      -       -      +
     91F  THR      2.9    19.8    +      -       -      +
     92F  THR*     3.7     3.1    -      -       -      +
     94F  ASP*     1.3    72.1    -      -       -      +
     96F  MET*     1.3    56.8    +      -       -      +
     98F  ALA*     3.2     6.7    +      -       -      +
     99F  ALA*     2.9    28.6    +      -       -      +
----------------------------------------------------------
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Residues in contact with MET 96 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     47F  VAL*     5.6     0.7    -      -       +      -
     50F  PHE*     3.5    41.7    -      -       +      -
     51F  PHE*     4.3     9.8    -      -       +      -
     92F  THR*     2.7    28.5    +      -       +      +
     93F  LEU      3.9     2.7    -      -       -      +
     95F  ALA*     1.3    70.5    -      -       -      +
     97F  LYS*     1.3    56.7    +      -       -      +
     99F  ALA*     3.2     4.3    +      -       -      +
    100F  ILE*     2.9    31.7    +      -       -      +
    144F  MET*     4.5    13.7    -      -       +      +
    147F  HIS*     4.0    30.3    -      -       +      -
    148F  LEU*     3.9    18.3    -      -       +      +
    151F  ILE*     3.5    26.2    -      -       +      -
    166F  PHE*     4.6     6.1    -      -       +      -
    171F  LEU*     4.9     3.6    -      -       +      -
----------------------------------------------------------
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Residues in contact with LYS 97 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     93F  LEU*     3.0    39.4    +      -       +      +
     94F  ASP*     3.6    12.7    +      -       -      +
     96F  MET*     1.3    75.3    -      -       -      +
     98F  ALA*     1.3    63.8    +      -       -      +
    100F  ILE*     3.2    12.5    -      -       +      +
    101F  VAL*     3.2    28.3    +      -       +      +
    148F  LEU*     3.5    15.5    -      -       +      -
    152F  GLN*     3.8    24.6    -      -       -      +
----------------------------------------------------------
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Residues in contact with ALA 98 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     33F  LEU*     5.3     4.0    -      -       +      -
     86F  GLN*     5.2     4.9    -      -       -      +
     89F  TRP*     4.4    24.9    -      -       +      -
     94F  ASP      3.0    14.2    +      -       -      +
     95F  ALA*     3.4    11.7    -      -       -      +
     97F  LYS*     1.3    76.4    -      -       -      +
     99F  ALA*     1.3    61.7    +      -       -      +
    101F  VAL*     3.4     6.7    +      -       -      +
    102F  LEU*     3.0    22.4    +      -       -      +
----------------------------------------------------------
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Residues in contact with ALA 99 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     30F  TYR*     3.6    30.7    -      -       +      +
     33F  LEU*     4.8     3.8    -      -       +      +
     51F  PHE*     3.8    14.1    -      -       +      -
     95F  ALA      2.9    16.2    +      -       -      +
     96F  MET*     3.7     6.1    -      -       -      +
     98F  ALA*     1.3    77.2    -      -       -      +
    100F  ILE*     1.3    57.5    +      -       -      +
    102F  LEU*     3.1     7.6    +      -       -      +
    103F  GLU*     2.9    30.8    +      -       -      +
    144F  MET*     3.9    11.4    -      -       +      -
----------------------------------------------------------
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Residues in contact with ILE 100 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
      3E  GLN*     4.3    14.6    -      -       +      +
      4E  ILE*     4.1    18.4    -      -       +      -
     96F  MET      2.9    15.7    +      -       -      +
     97F  LYS*     3.2    19.1    -      -       +      +
     99F  ALA*     1.3    74.9    -      -       -      +
    101F  VAL*     1.3    63.7    +      -       +      +
    103F  GLU*     3.2     2.3    +      -       -      +
    104F  LYS*     2.8    41.9    +      -       +      +
    141F  ILE*     4.1    13.7    -      -       +      +
    144F  MET*     4.0    18.1    -      -       +      -
    145F  GLY*     4.1    23.3    -      -       -      +
    148F  LEU*     3.9    18.2    -      -       +      -
----------------------------------------------------------
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Residues in contact with VAL 101 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     97F  LYS*     3.2    16.7    +      -       +      +
     98F  ALA*     3.5    10.1    -      -       -      +
    100F  ILE*     1.3    75.5    -      -       +      +
    102F  LEU*     1.3    66.7    +      -       -      +
    104F  LYS*     3.3    10.5    +      -       -      +
    105F  SER*     3.0    24.1    +      -       -      -
----------------------------------------------------------
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Residues in contact with LEU 102 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     22F  LEU      5.8     0.2    -      -       -      +
     25F  ARG*     5.2    11.7    -      -       -      +
     26F  ALA*     4.1    28.5    -      -       +      -
     29F  THR*     4.0    26.5    -      -       +      +
     30F  TYR*     3.8    32.3    -      -       +      +
     33F  LEU*     5.6     0.2    -      -       +      -
     98F  ALA      3.0    14.6    +      -       -      +
     99F  ALA*     3.3     8.7    -      -       -      +
    101F  VAL*     1.3    76.7    -      -       -      +
    103F  GLU*     1.3    65.3    +      -       -      +
    105F  SER*     2.8    30.1    +      -       -      +
    106F  LEU*     3.0    12.7    +      -       +      +
----------------------------------------------------------
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Residues in contact with GLU 103 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     30F  TYR*     2.6    26.4    +      -       -      +
     58F  LYS*     2.9    35.0    +      -       -      -
     99F  ALA      2.9    20.0    +      -       -      +
    100F  ILE*     3.7     7.9    -      -       -      +
    102F  LEU*     1.3    71.7    -      -       -      +
    104F  LYS*     1.3    57.4    +      -       -      +
    106F  LEU*     3.1    10.4    +      -       -      +
    107F  ASN*     2.7    28.4    +      -       -      +
    137F  GLU*     2.7    32.9    -      -       -      +
    140F  LEU*     3.4    17.5    -      -       +      +
    141F  ILE*     3.8    16.4    -      -       +      -
    144F  MET*     3.8    16.2    -      -       +      -
----------------------------------------------------------
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Residues in contact with LYS 104 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
      3E  GLN      3.0    28.6    +      -       -      -
      4E  ILE*     4.0    20.0    -      -       -      +
      5E  ARG      4.6     7.2    +      -       -      -
      6E  GLN*     2.8    46.1    +      -       +      +
    100F  ILE*     2.8    34.5    +      -       +      +
    101F  VAL*     3.5    11.0    -      -       -      +
    102F  LEU      3.2     0.2    -      -       -      -
    103F  GLU*     1.3    76.7    -      -       -      +
    105F  SER*     1.3    57.3    +      -       -      +
    107F  ASN      3.2     0.7    +      -       -      -
    108F  GLN*     2.9    15.1    +      -       -      +
    141F  ILE*     4.3     9.6    -      -       +      -
----------------------------------------------------------
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Residues in contact with SER 105 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     22F  LEU*     4.7     5.0    -      -       -      +
    101F  VAL*     3.0    13.9    +      -       -      -
    102F  LEU*     2.8    28.1    +      -       -      +
    104F  LYS*     1.3    72.3    -      -       -      +
    106F  LEU*     1.3    67.8    +      -       -      +
    108F  GLN*     3.4     7.7    +      -       -      +
    109F  ALA*     3.0    22.7    +      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 106 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     19F  LEU*     4.8     0.7    -      -       -      +
     22F  LEU*     3.9    43.5    -      -       +      +
     23F  TYR*     4.2    20.0    -      -       +      +
     26F  ALA*     3.8    23.3    -      -       +      -
     58F  LYS*     3.9    23.8    -      -       +      +
    102F  LEU*     3.0    12.0    +      -       +      +
    103F  GLU*     3.4    25.6    -      -       -      +
    105F  SER*     1.3    82.8    +      -       -      +
    107F  ASN*     1.3    63.7    +      -       -      +
    109F  ALA*     3.2     8.3    +      -       -      +
    110F  LEU*     3.0    27.3    +      -       -      +
    137F  GLU*     4.4     5.4    -      -       -      +
----------------------------------------------------------
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Residues in contact with ASN 107 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
      6E  GLN*     2.8    29.0    -      -       -      +
     72E  ARG*     5.9     0.5    +      -       -      -
    103F  GLU      2.7    16.9    +      -       -      +
    104F  LYS      3.5     0.4    -      -       -      +
    106F  LEU*     1.3    74.9    -      -       -      +
    108F  GLN*     1.3    66.1    +      -       -      +
    110F  LEU*     3.2    12.3    +      -       -      +
    111F  LEU*     2.9    37.0    +      -       -      +
    134F  LEU*     4.5     7.1    +      -       -      +
    137F  GLU*     3.2    33.2    -      -       +      +
    138F  VAL*     4.9     9.6    -      -       -      +
    141F  ILE*     4.1     9.0    -      -       +      +
----------------------------------------------------------
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Residues in contact with GLN 108 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
      6E  GLN*     3.7    20.7    +      -       -      +
      7E  ASN*     5.5     1.8    -      -       -      +
    104F  LYS      2.9    13.8    +      -       -      +
    105F  SER*     3.6    11.0    -      -       -      +
    107F  ASN*     1.3    76.1    -      -       -      +
    109F  ALA*     1.3    55.8    +      -       -      +
    111F  LEU*     3.1    21.7    +      -       -      +
    112F  ASP*     2.8    63.7    +      -       -      +
----------------------------------------------------------
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Residues in contact with ALA 109 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     18F  ARG*     4.2    14.5    +      -       -      +
     19F  LEU*     3.6    23.2    -      -       +      +
     22F  LEU*     3.7    17.7    -      -       +      -
    105F  SER      3.0    13.5    +      -       -      +
    106F  LEU      3.3     9.4    -      -       -      +
    108F  GLN*     1.3    74.3    -      -       -      +
    110F  LEU*     1.3    57.6    +      -       -      +
    112F  ASP*     3.5     9.0    +      -       -      +
    113F  LEU*     2.9    28.4    +      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 110 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     19F  LEU*     3.6    25.6    -      -       +      -
     23F  TYR*     3.7    20.9    -      -       +      +
    106F  LEU      3.0    15.5    +      -       -      +
    107F  ASN*     3.2    10.5    +      -       -      +
    109F  ALA*     1.3    72.8    -      -       -      +
    111F  LEU*     1.3    61.2    +      -       -      +
    113F  LEU*     3.1     6.0    +      -       -      +
    114F  HIS*     2.7    32.6    +      -       -      +
    129F  LEU*     4.1    12.7    -      -       +      +
    133F  PHE*     3.6    43.1    -      -       +      +
    134F  LEU*     3.7    12.8    -      -       +      -
    137F  GLU*     3.9    25.6    -      -       +      -
----------------------------------------------------------
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Residues in contact with LEU 111 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
      6E  GLN*     4.8     4.5    -      -       -      +
      7E  ASN*     3.6    39.9    -      -       +      +
    123E  PRO*     3.8    26.7    -      -       +      +
    124E  HIS*     5.8     1.8    -      -       +      +
    107F  ASN*     2.9    33.4    +      -       -      +
    108F  GLN*     3.3    30.7    -      -       -      +
    110F  LEU*     1.3    77.0    -      -       -      +
    112F  ASP*     1.3    63.1    +      -       -      +
    114F  HIS*     3.4     4.9    +      -       -      +
    115F  ALA*     3.0    21.8    +      -       -      +
    134F  LEU*     4.1    15.9    -      -       +      -
----------------------------------------------------------
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Residues in contact with ASP 112 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     18F  ARG*     5.7     2.4    +      -       -      +
    108F  GLN*     2.8    45.8    +      -       -      +
    109F  ALA*     3.6     7.9    -      -       -      +
    111F  LEU*     1.3    72.1    -      -       -      +
    113F  LEU*     1.3    65.5    +      -       -      +
    115F  ALA*     2.8    19.9    +      -       -      +
    116F  LEU*     3.0    11.9    +      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 113 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     12F  VAL*     4.4     9.2    -      -       +      +
     15F  ALA*     3.5    30.3    -      -       +      -
     16F  VAL*     4.1    20.4    -      -       +      +
     19F  LEU*     3.6    29.4    -      -       +      -
     65F  LEU*     5.2     0.9    -      -       +      -
    109F  ALA      2.9    20.8    +      -       -      +
    110F  LEU*     3.7     4.5    -      -       -      +
    112F  ASP*     1.3    69.7    -      -       -      +
    114F  HIS*     1.3    58.8    +      -       -      +
    116F  LEU*     3.2    16.9    +      -       +      +
    117F  GLY*     2.9    24.6    +      -       -      -
    125F  LEU*     3.9    17.3    -      -       +      +
    129F  LEU*     3.9    22.2    -      -       +      -
----------------------------------------------------------
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Residues in contact with HIS 114 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    123E  PRO*     3.5    31.7    -      -       +      +
    110F  LEU      2.7    21.6    +      -       -      +
    111F  LEU*     3.5     7.9    -      -       -      +
    113F  LEU*     1.3    72.8    -      -       -      +
    115F  ALA*     1.3    58.5    +      -       -      +
    117F  GLY*     3.1     3.4    +      -       -      +
    118F  SER*     3.0    31.7    +      -       -      -
    125F  LEU*     5.1     0.2    -      -       -      -
    126F  CYS*     3.7    38.9    -      -       +      +
    129F  LEU*     3.7    15.6    -      -       +      +
    130F  GLU*     2.8    30.0    +      -       -      -
    134F  LEU*     4.0    13.2    -      -       +      -
----------------------------------------------------------
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Residues in contact with ALA 115 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    121E  ALA*     6.3     3.1    -      -       +      -
    111F  LEU      3.0    12.4    +      -       -      +
    112F  ASP*     2.8    13.5    +      -       -      +
    114F  HIS*     1.3    72.7    +      -       -      +
    116F  LEU*     1.3    60.6    +      -       -      +
    118F  SER*     3.1     9.1    +      -       -      -
    119F  ALA*     2.8    29.7    +      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 116 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     11F  GLU*     3.5    43.3    -      -       +      +
     12F  VAL*     3.9     7.6    -      -       +      +
     15F  ALA*     3.9    17.0    -      -       +      -
    112F  ASP      3.0     9.9    +      -       -      +
    113F  LEU*     3.2    11.7    -      -       +      +
    115F  ALA*     1.3    74.7    -      -       -      +
    117F  GLY*     1.3    55.4    +      -       -      +
    119F  ALA*     3.0     9.1    +      -       +      +
    120F  GLN*     2.8    62.1    +      -       +      +
----------------------------------------------------------
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Residues in contact with GLY 117 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     12F  VAL*     4.6     1.5    -      -       -      +
    113F  LEU      2.9    10.7    +      -       -      -
    114F  HIS      3.1     4.0    +      -       -      -
    116F  LEU*     1.3    76.3    -      -       -      +
    118F  SER*     1.3    54.2    +      -       -      +
    120F  GLN*     3.4     2.5    +      -       -      -
    121F  ALA      3.0     7.3    +      -       -      -
    122F  ASP*     2.7    36.4    +      -       -      +
    125F  LEU*     3.6    25.7    -      -       -      +
    126F  CYS*     3.7    10.5    -      -       -      -
----------------------------------------------------------
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Residues in contact with SER 118 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    114F  HIS*     3.0    23.2    +      -       -      -
    115F  ALA*     3.1    14.2    +      -       -      -
    117F  GLY*     1.3    74.2    -      -       -      +
    119F  ALA*     1.3    58.5    +      -       -      +
    121F  ALA*     2.9    20.6    +      -       -      +
    122F  ASP      4.7     0.2    -      -       -      +
    126F  CYS*     3.5    12.2    -      -       -      -
----------------------------------------------------------
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Residues in contact with ALA 119 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    115F  ALA      2.8    17.9    +      -       -      +
    116F  LEU*     3.4    14.8    -      -       +      +
    118F  SER*     1.3    72.2    -      -       -      +
    120F  GLN*     1.3    68.0    +      -       +      +
    121F  ALA*     3.4     1.9    +      -       -      +
----------------------------------------------------------
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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