Contacts of the helix formed by residues 90 - 115 (chain E) 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 E).
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     89E  THR*     1.3    73.4    +      -       -      +
     91E  GLU*     1.3    64.8    +      -       -      +
     93E  LYS*     2.7    24.5    +      -       -      +
     94E  ILE*     2.9    30.9    +      -       +      +
     67F  HIS*     5.2     7.6    -      -       +      +
     78F  TYR*     4.0    21.3    -      -       +      -
     81F  ARG*     3.1    38.9    +      -       -      +
     82F  LYS*     4.3    14.2    -      -       -      +
----------------------------------------------------------
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Residues in contact with GLU 91 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     89E  THR*     3.1    15.8    +      -       +      +
     90E  GLU*     1.3    79.7    -      -       -      +
     92E  GLU*     1.3    69.3    +      -       +      +
     94E  ILE*     3.4    14.0    +      -       -      +
     95E  ARG*     3.5    23.3    +      -       -      +
    148E  VAL      5.7     1.1    -      -       -      +
     67F  HIS*     6.4     0.9    -      -       -      -
----------------------------------------------------------
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Residues in contact with GLU 92 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     87E  GLY*     3.9     7.2    -      -       -      -
     88E  GLU*     3.4    16.1    +      -       -      +
     89E  THR*     2.9    25.0    +      -       +      +
     91E  GLU*     1.3    84.9    -      -       +      +
     93E  LYS*     1.3    62.3    +      -       -      +
     94E  ILE      3.3     0.2    +      -       -      -
     95E  ARG*     3.5     5.3    +      -       -      +
     96E  VAL*     2.9    32.5    +      -       -      +
    148E  VAL*     3.6    32.8    -      -       +      +
    149E  GLY*     5.0     0.5    -      -       -      -
    150E  ASP*     4.8     8.5    +      -       -      +
    151E  LYS*     3.3    38.7    +      -       -      +
----------------------------------------------------------
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Residues in contact with LYS 93 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     87E  GLY*     3.5    23.9    +      -       -      +
     88E  GLU*     3.3     8.5    +      -       -      +
     89E  THR*     2.8    42.0    +      -       -      +
     90E  GLU*     2.7    22.2    +      -       -      +
     92E  GLU*     1.3    79.0    -      -       -      +
     94E  ILE*     1.3    56.8    +      -       -      +
     96E  VAL*     3.7     4.6    +      -       -      +
     97E  ASP*     2.7    30.8    +      -       -      +
     81F  ARG*     3.3    39.3    -      -       -      +
----------------------------------------------------------
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Residues in contact with ILE 94 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     90E  GLU*     2.9    32.2    +      -       +      +
     91E  GLU*     3.9     7.6    -      -       -      +
     92E  GLU      3.3     0.2    -      -       -      -
     93E  LYS*     1.3    77.2    -      -       -      +
     95E  ARG*     1.3    59.7    +      -       -      +
     97E  ASP*     3.2     9.4    +      -       -      +
     98E  ILE*     3.0    30.4    +      -       +      +
     67F  HIS*     3.8    25.1    -      -       +      -
     68F  LYS      5.9     0.2    -      -       -      -
     69F  ILE*     3.2    36.8    -      -       +      -
     74F  ALA*     5.0     2.1    -      -       -      +
     78F  TYR*     3.6    33.9    -      -       +      -
     81F  ARG*     5.1     3.6    -      -       -      +
----------------------------------------------------------
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Residues in contact with ARG 95 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     91E  GLU*     3.5    22.8    -      -       -      +
     92E  GLU*     3.9     8.3    -      -       -      +
     94E  ILE*     1.3    73.8    -      -       -      +
     96E  VAL*     1.3    64.4    +      -       -      +
     98E  ILE*     3.4    10.1    -      -       +      +
     99E  LEU*     3.1    29.0    +      -       -      +
    139E  GLN      5.5     0.2    +      -       -      -
    140E  PHE*     3.0    67.6    +      -       +      +
    144E  ARG*     3.4    23.7    -      -       -      +
    147E  PHE      2.7    31.1    +      -       -      +
    148E  VAL*     3.6    22.4    -      -       -      +
     55F  ASP*     4.0    10.3    +      -       -      -
----------------------------------------------------------
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Residues in contact with VAL 96 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     86E  CYS*     5.2     1.3    -      -       +      -
     87E  GLY      4.0    20.9    -      -       -      +
     92E  GLU      2.9    27.8    +      -       -      +
     93E  LYS*     3.8     6.3    -      -       -      +
     95E  ARG*     1.3    76.6    -      -       -      +
     97E  ASP*     1.3    70.7    +      -       -      +
     99E  LEU      3.7     0.2    +      -       -      -
    100E  GLU*     3.1     9.3    +      -       -      +
    148E  VAL*     3.5    29.6    -      -       +      -
    153E  THR*     4.5     3.6    -      -       +      +
    154E  PHE*     3.8    20.9    -      -       +      -
    155E  VAL*     3.0    43.0    -      -       +      +
----------------------------------------------------------
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Residues in contact with ASP 97 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     93E  LYS*     2.7    21.5    -      -       -      +
     94E  ILE*     3.2     8.3    +      -       -      +
     96E  VAL*     1.3    82.8    -      -       -      +
     98E  ILE*     1.3    69.8    +      -       -      +
    100E  GLU*     3.0    13.5    +      -       -      +
    101E  ASN*     2.8    29.1    +      -       -      +
     74F  ALA*     4.0    19.1    -      -       +      +
     77F  CYS*     3.4    18.8    -      -       -      +
     81F  ARG*     2.9    34.2    +      -       -      -
----------------------------------------------------------
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Residues in contact with ILE 98 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     94E  ILE*     3.0    21.3    +      -       +      +
     95E  ARG*     3.4    15.5    -      -       -      +
     97E  ASP*     1.3    80.3    -      -       -      +
     99E  LEU*     1.3    54.2    +      -       -      +
    101E  ASN*     3.0     3.3    +      -       -      +
    102E  GLN*     2.7    37.2    +      -       +      +
    140E  PHE*     3.6    26.9    -      -       +      -
     55F  ASP*     5.7     2.7    -      -       -      +
     56F  PHE*     3.8    19.7    -      -       +      -
     68F  LYS      4.9     3.1    -      -       -      +
     69F  ILE*     3.6    18.8    -      -       +      -
     70F  THR*     3.5    42.0    -      -       -      +
     71F  GLN*     4.6     2.8    -      -       +      +
     74F  ALA*     4.1     5.6    -      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 99 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     95E  ARG      3.1    13.6    +      -       -      +
     96E  VAL      4.0     2.9    -      -       -      +
     98E  ILE*     1.3    78.8    -      -       -      +
    100E  GLU*     1.3    59.5    -      -       -      +
    102E  GLN*     4.3     3.1    -      -       +      -
    103E  ALA*     2.6    39.4    +      -       +      +
    137E  PHE*     4.6    12.1    -      -       +      -
    140E  PHE*     3.7    21.5    -      -       +      -
    147E  PHE*     3.2    54.7    -      -       +      -
    148E  VAL*     5.2     0.2    -      -       +      -
    155E  VAL*     4.1    29.4    -      -       +      +
    158E  LEU*     5.4     0.2    -      -       -      -
    159E  ALA*     5.2     4.9    -      -       +      -
     56F  PHE*     4.4    16.4    -      -       +      -
----------------------------------------------------------
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Residues in contact with GLU 100 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     73E  ASN*     3.0    42.9    +      -       -      +
     77E  CYS*     3.8    18.7    -      -       -      -
     96E  VAL*     3.1    10.5    +      -       -      +
     97E  ASP*     3.0    20.9    +      -       -      +
     99E  LEU*     1.3    78.3    -      -       -      +
    101E  ASN*     1.3    64.0    +      -       -      +
    104E  MET*     3.3    22.5    +      -       -      +
    154E  PHE*     3.6    24.7    -      -       +      -
    155E  VAL*     4.1     6.2    -      -       +      +
    158E  LEU*     4.0    15.1    -      -       +      +
    100F  GLU*     4.0    14.5    -      -       -      +
----------------------------------------------------------
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Residues in contact with ASN 101 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     73E  ASN*     5.1     3.9    +      -       -      +
     97E  ASP*     2.8    33.3    +      -       -      +
     98E  ILE      3.7     3.1    -      -       -      +
    100E  GLU*     1.3    92.5    +      -       -      +
    102E  GLN*     1.3    59.8    +      -       -      +
    104E  MET*     3.6     3.4    +      -       -      +
    105E  ASP      2.8    22.9    +      -       -      -
     71F  GLN*     3.0    38.2    +      -       +      +
     72F  SER*     5.5     0.2    +      -       -      -
     73F  ASN*     2.8    45.9    +      -       -      +
     74F  ALA      4.2     7.0    -      -       -      +
    100F  GLU*     4.5     2.1    +      -       -      +
----------------------------------------------------------
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Residues in contact with GLN 102 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     98E  ILE*     2.7    28.3    +      -       +      +
     99E  LEU*     3.9     4.0    -      -       -      +
    101E  ASN*     1.3    71.6    -      -       -      +
    103E  ALA*     1.3    66.3    -      -       -      +
    105E  ASP*     3.0    29.6    +      -       -      +
    106E  VAL*     2.9    37.3    +      -       +      +
    137E  PHE*     4.8     5.6    -      -       +      -
     56F  PHE*     3.6    52.7    -      -       +      +
     58F  ASN*     5.0     9.6    -      -       -      +
     70F  THR*     4.3     4.5    +      -       -      -
     71F  GLN*     3.9    17.4    -      -       +      +
----------------------------------------------------------
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Residues in contact with ALA 103 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     99E  LEU*     2.6    28.1    +      -       +      +
    100E  GLU      4.8     1.1    -      -       -      +
    102E  GLN*     1.3    73.1    -      -       -      +
    104E  MET*     1.3    59.1    +      -       -      +
    106E  VAL*     3.1    22.9    -      -       -      +
    107E  SER*     3.1     7.3    +      -       -      -
    137E  PHE*     4.7    10.9    -      -       +      -
    158E  LEU*     4.5    19.3    -      -       +      -
    159E  ALA*     4.6     8.1    -      -       -      +
    162E  VAL*     3.3    26.6    -      -       +      +
----------------------------------------------------------
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Residues in contact with MET 104 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     12E  LEU*     4.8    19.5    -      -       +      -
     72E  SER*     4.5    20.2    -      -       -      +
     73E  ASN*     4.1    23.8    -      -       -      +
    100E  GLU      3.3    20.2    +      -       -      +
    101E  ASN*     3.6     4.5    +      -       -      +
    102E  GLN      3.2     0.4    -      -       -      -
    103E  ALA*     1.3    74.9    -      -       -      +
    105E  ASP*     1.3    68.0    +      -       -      +
    107E  SER*     2.7    25.6    +      -       -      +
    108E  ASN*     2.8    46.9    +      -       -      +
    158E  LEU*     5.6    10.0    -      -       +      +
----------------------------------------------------------
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Residues in contact with ASP 105 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    101E  ASN      2.8    17.6    +      -       -      +
    102E  GLN*     3.0    29.0    +      -       -      +
    104E  MET*     1.3    75.4    -      -       -      +
    106E  VAL*     1.3    58.2    +      -       -      +
    108E  ASN*     3.2     9.4    +      -       -      +
    109E  GLN*     2.9    42.9    +      -       -      +
    112E  ARG*     4.8     4.8    +      -       -      -
     58F  ASN*     6.2     1.8    -      -       -      -
     71F  GLN*     3.6    16.4    +      -       -      +
----------------------------------------------------------
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Residues in contact with VAL 106 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    102E  GLN*     2.9    32.9    +      -       +      +
    103E  ALA*     3.1    20.0    -      -       -      +
    105E  ASP*     1.3    74.3    -      -       -      +
    107E  SER*     1.3    59.3    +      -       -      +
    108E  ASN      3.3     0.2    -      -       -      -
    109E  GLN*     3.2    24.5    -      -       -      +
    110E  LEU*     3.0    27.0    +      -       -      +
    126E  TYR*     4.3    10.2    +      -       -      +
    133E  MET*     4.5    19.3    -      -       +      -
    137E  PHE*     4.9     8.1    -      -       +      -
    162E  VAL*     3.5    26.0    -      -       +      -
    166E  HIS*     4.7     4.5    +      -       +      -
----------------------------------------------------------
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Residues in contact with SER 107 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     12E  LEU*     6.0     1.7    -      -       -      +
    103E  ALA      3.1    14.3    +      -       -      -
    104E  MET*     2.7    23.9    +      -       -      +
    106E  VAL*     1.3    76.9    -      -       -      +
    108E  ASN*     1.3    56.3    +      -       -      +
    110E  LEU*     3.4     6.8    +      -       -      +
    111E  ALA*     3.0    28.8    +      -       -      +
    161E  ASP*     4.9     4.5    +      -       -      -
    162E  VAL*     4.6     9.9    -      -       -      +
    165E  LEU*     4.6    16.8    -      -       -      +
    166E  HIS*     6.0     1.3    -      -       -      -
    208E  TYR*     5.1     0.9    +      -       -      -
----------------------------------------------------------
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Residues in contact with ASN 108 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     12E  LEU*     6.0     1.6    -      -       -      +
    104E  MET*     2.8    54.8    +      -       -      +
    105E  ASP*     3.5     8.1    +      -       -      +
    107E  SER*     1.3    74.5    -      -       -      +
    109E  GLN*     1.3    61.2    +      -       -      +
    111E  ALA*     4.0     6.7    -      -       -      +
    112E  ARG*     2.8    45.7    +      -       -      +
    108F  ASN*     5.9     2.0    -      -       -      -
    112F  ARG*     5.3    11.2    -      -       -      +
----------------------------------------------------------
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Residues in contact with GLN 109 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    105E  ASP*     2.9    29.3    +      -       -      +
    106E  VAL*     3.2    20.6    -      -       -      +
    108E  ASN*     1.3    79.8    -      -       -      +
    110E  LEU*     1.3    57.1    +      -       -      +
    112E  ARG*     4.0    25.3    +      -       -      +
    113E  VAL*     3.1    25.6    +      -       -      +
    126E  TYR*     3.5    29.2    +      -       +      -
    133E  MET*     3.9    13.7    -      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 110 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    106E  VAL      3.0    15.0    +      -       -      +
    107E  SER*     3.8     7.2    -      -       -      +
    109E  GLN*     1.3    75.9    -      -       -      +
    111E  ALA*     1.3    65.3    +      -       -      +
    113E  VAL*     2.9    20.7    +      -       +      +
    114E  CYS*     3.0    18.6    +      -       -      -
    126E  TYR*     3.8    17.7    -      -       +      -
    165E  LEU*     4.6    20.0    -      -       +      -
    166E  HIS*     3.7    31.4    -      -       +      +
    169E  PHE*     3.5    37.2    -      -       +      -
    208E  TYR*     3.4    19.5    -      -       -      +
    214E  TRP*     5.3     4.3    -      -       +      -
----------------------------------------------------------
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Residues in contact with ALA 111 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    107E  SER      3.0    18.3    +      -       -      +
    108E  ASN*     4.0     7.6    -      -       -      +
    110E  LEU*     1.3    76.2    -      -       -      +
    112E  ARG*     1.3    62.9    +      -       -      +
    114E  CYS*     2.9     4.0    +      -       -      +
    115E  TYR*     2.9    45.5    +      -       +      +
    208E  TYR*     3.8    28.0    +      -       +      -
----------------------------------------------------------
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Residues in contact with ARG 112 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    105E  ASP*     4.8     4.6    +      -       -      -
    108E  ASN*     2.8    30.1    +      -       -      +
    109E  GLN*     4.0    37.9    +      -       -      +
    111E  ALA*     1.3    75.4    -      -       -      +
    113E  VAL*     1.3    59.6    +      -       +      +
    115E  TYR*     3.5    11.2    +      -       -      +
    116E  SER*     2.9    28.4    +      -       -      +
    122E  LEU*     5.6     0.2    -      -       -      -
    112F  ARG*     4.5    28.6    -      -       -      +
----------------------------------------------------------
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Residues in contact with VAL 113 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    109E  GLN*     3.1    21.1    -      -       +      +
    110E  LEU*     2.9    16.0    +      -       +      +
    112E  ARG*     1.3    73.2    -      -       +      +
    114E  CYS*     1.3    61.8    +      -       -      +
    115E  TYR      3.0     3.6    -      -       -      -
    116E  SER*     2.8    34.5    +      -       -      +
    119E  PHE*     4.7    12.7    -      -       +      -
    122E  LEU*     3.6    44.4    -      -       +      +
    123E  LYS*     4.3     5.8    -      -       -      +
    126E  TYR*     4.8    17.3    -      -       +      -
    169E  PHE*     5.7     2.9    -      -       +      -
    213E  VAL*     4.6     0.7    -      -       -      +
----------------------------------------------------------
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Residues in contact with CYS 114 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    110E  LEU*     3.0    21.0    +      -       -      +
    111E  ALA      2.9     8.6    +      -       -      +
    113E  VAL*     1.3    78.5    -      -       -      +
    115E  TYR*     1.3    59.0    +      -       -      +
    116E  SER      3.4     0.2    -      -       -      -
    119E  PHE*     4.5     8.5    -      -       -      -
    169E  PHE*     4.7     2.5    -      -       -      -
    208E  TYR*     4.1    22.0    -      -       +      -
    212E  ALA*     3.5     3.3    -      -       -      +
    213E  VAL*     3.0    37.3    +      -       -      +
    214E  TRP*     3.3    51.4    -      -       +      +
----------------------------------------------------------
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Residues in contact with TYR 115 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    111E  ALA*     2.9    36.2    +      -       +      +
    112E  ARG*     3.8     9.2    -      -       -      +
    113E  VAL      3.0     0.2    -      -       -      -
    114E  CYS*     1.3    78.2    -      -       -      +
    116E  SER*     1.3    62.9    +      -       -      +
    117E  PRO*     3.6     7.4    -      -       -      +
    208E  TYR*     3.9    19.3    -      +       +      +
    209E  THR*     4.9    10.7    +      -       -      +
    211E  VAL*     5.3     4.5    -      -       +      -
    212E  ALA*     3.5    33.7    -      -       +      +
    213E  VAL*     4.9     4.0    -      -       -      +
----------------------------------------------------------
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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