Contacts of the helix formed by residues 92 - 119 (chain E) 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 E).
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     37E  PHE*     4.0    10.2    -      -       -      -
     44E  LEU*     4.2     5.9    -      -       -      +
     47E  VAL*     3.9    34.9    -      -       +      +
     51E  PHE*     5.9     0.2    -      -       +      -
     91E  THR*     1.3    71.2    -      -       -      +
     93E  LEU*     1.3    56.4    +      -       -      +
     95E  ALA*     3.2     2.3    +      -       +      +
     96E  MET*     2.8    36.2    +      -       +      +
    151E  ILE*     3.7    24.9    -      -       +      -
    163E  GLU*     2.7    31.7    +      -       -      +
    166E  PHE*     4.2    13.7    -      -       +      -
----------------------------------------------------------
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Residues in contact with LEU 93 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     91E  THR*     3.2     8.7    +      -       -      +
     92E  THR*     1.3    75.2    -      -       -      +
     94E  ASP*     1.3    71.5    +      -       -      +
     96E  MET*     3.9     0.6    -      -       -      +
     97E  LYS*     3.0    50.9    +      -       -      +
    148E  LEU*     3.5    28.9    -      -       +      -
    151E  ILE*     4.1    27.5    -      -       +      +
    152E  GLN*     3.7    31.0    -      -       +      +
    155E  VAL*     4.4    20.6    -      -       +      +
    163E  GLU*     5.6     0.6    -      -       -      +
----------------------------------------------------------
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Residues in contact with ASP 94 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     89E  TRP      3.4    18.2    -      -       -      +
     90E  GLY*     3.5     6.9    -      -       -      -
     91E  THR*     2.8    30.5    +      -       -      +
     93E  LEU*     1.3    82.9    -      -       -      +
     95E  ALA*     1.3    59.6    +      -       -      +
     97E  LYS*     3.6    12.7    +      -       -      +
     98E  ALA*     3.2    21.8    +      -       -      +
----------------------------------------------------------
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Residues in contact with ALA 95 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     33E  LEU*     3.6    25.9    -      -       +      +
     37E  PHE*     3.5    24.2    -      -       +      -
     51E  PHE*     3.8    11.8    -      -       +      -
     89E  TRP*     3.8     6.9    +      -       -      +
     91E  THR      2.8    20.4    +      -       -      +
     92E  THR      3.2     3.6    +      -       -      +
     94E  ASP*     1.3    69.9    -      -       -      +
     96E  MET*     1.3    59.1    +      -       -      +
     98E  ALA*     3.3     6.2    +      -       -      +
     99E  ALA*     2.9    28.1    +      -       -      +
----------------------------------------------------------
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Residues in contact with MET 96 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     47E  VAL*     5.6     0.7    -      -       +      -
     50E  PHE*     3.5    40.2    -      -       +      -
     51E  PHE*     4.3    10.0    -      -       +      -
     92E  THR*     2.8    24.9    +      -       +      +
     93E  LEU      3.9     2.7    -      -       -      +
     95E  ALA*     1.3    66.9    -      -       -      +
     97E  LYS*     1.3    60.2    +      -       -      +
     99E  ALA*     3.2     3.9    +      -       -      +
    100E  ILE*     2.8    33.1    +      -       -      +
    144E  MET*     4.7    14.0    -      -       +      +
    147E  HIS*     3.9    31.0    -      -       +      -
    148E  LEU*     3.9    19.0    -      -       +      +
    151E  ILE*     3.4    28.9    -      -       +      -
    166E  PHE*     4.7     4.9    -      -       +      -
    171E  LEU*     5.0     4.5    -      -       +      -
----------------------------------------------------------
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Residues in contact with LYS 97 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     93E  LEU*     3.0    39.2    +      -       +      +
     94E  ASP*     3.7    11.2    +      -       -      +
     96E  MET*     1.3    78.9    -      -       -      +
     98E  ALA*     1.3    61.4    +      -       -      +
    100E  ILE*     3.2    24.1    -      -       +      +
    101E  VAL*     3.2    15.5    +      -       +      +
    148E  LEU*     3.5    15.5    -      -       +      -
    152E  GLN*     3.7    25.2    -      -       -      +
----------------------------------------------------------
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Residues in contact with ALA 98 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     33E  LEU*     5.3     3.6    -      -       +      -
     86E  GLN*     5.1     4.9    -      -       -      +
     89E  TRP*     4.4    26.5    -      -       +      -
     94E  ASP      3.2    11.4    +      -       -      +
     95E  ALA      3.3     8.5    +      -       -      +
     97E  LYS*     1.3    78.5    -      -       -      +
     99E  ALA*     1.3    57.7    +      -       -      +
    101E  VAL*     3.4     7.1    +      -       -      +
    102E  LEU*     2.9    28.1    +      -       -      +
----------------------------------------------------------
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Residues in contact with ALA 99 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     30E  TYR*     3.7    20.1    +      -       +      +
     33E  LEU*     4.9     3.1    -      -       +      +
     51E  PHE*     3.9    22.4    -      -       +      -
     95E  ALA      2.9    16.8    +      -       -      +
     96E  MET*     3.6     6.5    -      -       -      +
     98E  ALA*     1.3    74.1    -      -       -      +
    100E  ILE*     1.3    59.9    +      -       -      +
    102E  LEU*     2.9     9.2    +      -       -      +
    103E  GLU*     2.8    29.5    +      -       -      +
    144E  MET*     3.9    13.2    -      -       +      -
----------------------------------------------------------
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Residues in contact with ILE 100 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
      3D  GLN*     4.3    15.3    -      -       +      +
      4D  ILE*     4.0    27.8    -      -       +      -
     96E  MET      2.8    19.0    +      -       -      +
     97E  LYS*     3.2    18.6    -      -       -      +
     99E  ALA*     1.3    69.7    -      -       -      +
    101E  VAL*     1.3    59.1    +      -       +      +
    103E  GLU*     3.2     2.5    +      -       -      +
    104E  LYS*     2.8    47.1    +      -       +      +
    141E  ILE*     4.1    12.1    -      -       +      -
    144E  MET*     4.0    18.1    -      -       +      -
    145E  GLY*     4.2    14.4    -      -       -      +
    148E  LEU*     4.0    18.8    -      -       +      -
----------------------------------------------------------
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Residues in contact with VAL 101 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     97E  LYS*     3.2    13.6    +      -       +      +
     98E  ALA*     3.5    10.5    -      -       -      +
     99E  ALA      3.2     0.2    -      -       -      -
    100E  ILE*     1.3    78.6    -      -       +      +
    102E  LEU*     1.3    67.1    +      -       -      +
    104E  LYS*     3.3     9.9    +      -       +      +
    105E  SER*     3.1    24.4    +      -       -      -
----------------------------------------------------------
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Residues in contact with LEU 102 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     25E  ARG*     5.6     7.2    -      -       -      +
     26E  ALA*     4.1    23.1    -      -       +      +
     29E  THR*     3.7    34.1    -      -       +      +
     30E  TYR*     3.7    33.7    -      -       +      +
     33E  LEU*     5.7     0.2    -      -       +      -
     98E  ALA      2.9    15.7    +      -       -      +
     99E  ALA*     3.2     9.4    -      -       -      +
    101E  VAL*     1.3    76.3    -      -       -      +
    103E  GLU*     1.3    63.4    +      -       -      +
    105E  SER*     2.8    29.3    +      -       -      +
    106E  LEU*     3.1    11.5    +      -       +      +
----------------------------------------------------------
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Residues in contact with GLU 103 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     30E  TYR*     2.5    30.7    +      -       -      +
     58E  LYS*     2.9    34.9    +      -       -      -
     99E  ALA      2.8    15.0    +      -       -      +
    100E  ILE*     3.7     7.0    -      -       -      +
    102E  LEU*     1.3    71.4    -      -       -      +
    104E  LYS*     1.3    57.4    +      -       -      +
    106E  LEU*     3.0     9.8    +      -       -      +
    107E  ASN*     2.8    30.1    +      -       -      +
    137E  GLU*     2.7    30.5    -      -       -      +
    140E  LEU*     3.5    18.6    -      -       +      +
    141E  ILE*     3.7    14.6    -      -       +      -
    144E  MET*     4.0    15.7    -      -       -      -
----------------------------------------------------------
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Residues in contact with LYS 104 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
      3D  GLN      3.0    28.4    +      -       -      -
      4D  ILE*     4.0    20.2    -      -       -      +
      5D  ARG      4.5     7.2    +      -       -      -
      6D  GLN*     2.8    46.6    +      -       +      +
    100E  ILE*     2.8    39.5    +      -       +      +
    101E  VAL*     3.5    10.5    -      -       -      +
    103E  GLU*     1.3    73.6    -      -       -      +
    105E  SER*     1.3    57.0    +      -       -      +
    107E  ASN*     3.3     1.4    +      -       -      -
    108E  GLN*     2.9    13.9    +      -       -      +
    141E  ILE*     4.2    10.1    -      -       +      -
----------------------------------------------------------
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Residues in contact with SER 105 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     22E  LEU*     4.8     4.9    -      -       -      +
    101E  VAL*     3.1    13.7    +      -       -      -
    102E  LEU*     2.8    27.7    +      -       -      +
    104E  LYS*     1.3    72.3    -      -       -      +
    106E  LEU*     1.3    68.3    +      -       -      +
    108E  GLN*     3.4     7.4    +      -       -      +
    109E  ALA*     3.0    22.5    +      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 106 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     19E  LEU*     4.8     1.1    -      -       +      +
     22E  LEU*     3.9    42.4    -      -       +      +
     23E  TYR*     4.1    21.1    -      -       +      +
     26E  ALA*     3.8    24.5    -      -       +      -
     58E  LYS*     3.9    30.1    -      -       +      +
    102E  LEU*     3.1     9.4    +      -       +      +
    103E  GLU*     3.0    19.7    +      -       -      +
    105E  SER*     1.3    84.7    +      -       -      +
    107E  ASN*     1.3    58.7    +      -       -      +
    109E  ALA*     3.1     7.5    +      -       -      +
    110E  LEU*     3.0    33.2    +      -       -      +
    137E  GLU*     4.6     4.5    -      -       -      +
----------------------------------------------------------
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Residues in contact with ASN 107 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
      6D  GLN*     2.7    29.8    -      -       -      +
     72D  ARG*     5.9     0.9    +      -       -      -
    103E  GLU      2.8    13.1    +      -       -      +
    104E  LYS      3.4     4.7    -      -       -      +
    106E  LEU*     1.3    74.0    -      -       -      +
    108E  GLN*     1.3    65.9    +      -       -      +
    110E  LEU*     3.2    11.6    +      -       -      +
    111E  LEU*     2.9    37.2    +      -       -      +
    134E  LEU*     4.6     7.1    +      -       -      +
    137E  GLU*     3.3    34.1    -      -       +      +
    138E  VAL*     4.9    10.2    -      -       -      +
    141E  ILE*     4.1     8.6    -      -       +      +
----------------------------------------------------------
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Residues in contact with GLN 108 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
      6D  GLN*     3.5    19.3    +      -       -      +
      7D  ASN*     5.6     1.4    -      -       -      +
    104E  LYS      2.9    17.3    +      -       -      +
    105E  SER*     3.6    10.3    -      -       -      +
    107E  ASN*     1.3    72.4    -      -       -      +
    109E  ALA*     1.3    56.9    +      -       -      +
    111E  LEU*     3.1    22.7    +      -       -      +
    112E  ASP*     2.8    63.1    +      -       -      +
----------------------------------------------------------
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Residues in contact with ALA 109 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     19E  LEU*     3.7    14.3    -      -       +      +
     22E  LEU*     3.6    26.5    -      -       +      -
    105E  SER      3.0    13.4    +      -       -      +
    106E  LEU      3.1     9.8    +      -       -      +
    108E  GLN*     1.3    74.8    -      -       -      +
    110E  LEU*     1.3    57.3    +      -       -      +
    112E  ASP*     3.4     8.7    +      -       -      +
    113E  LEU*     2.9    28.9    +      -       -      +
----------------------------------------------------------
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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
----------------------------------------------------------
     19E  LEU*     3.7    24.9    -      -       +      +
     23E  TYR*     3.5    24.7    -      -       +      +
    106E  LEU      3.0    14.7    +      -       -      +
    107E  ASN*     3.5    10.8    -      -       -      +
    109E  ALA*     1.3    72.5    -      -       -      +
    111E  LEU*     1.3    56.2    +      -       -      +
    113E  LEU*     3.1     5.5    +      -       -      +
    114E  HIS*     2.7    36.5    +      -       -      +
    129E  LEU*     3.9    13.1    -      -       +      +
    133E  PHE*     3.6    40.4    -      -       +      +
    134E  LEU*     3.8    12.3    -      -       +      -
    137E  GLU*     3.8    26.2    -      -       +      +
----------------------------------------------------------
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Residues in contact with LEU 111 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
      6D  GLN*     4.6     4.9    -      -       -      +
      7D  ASN*     3.7    39.7    -      -       +      +
    123D  PRO*     3.9    24.1    -      -       +      +
    124D  HIS*     5.8     2.0    -      -       +      +
    107E  ASN*     2.9    33.2    +      -       -      +
    108E  GLN*     3.3    32.3    -      -       -      +
    110E  LEU*     1.3    76.1    -      -       -      +
    112E  ASP*     1.3    56.3    +      -       -      +
    114E  HIS*     3.3     6.0    +      -       -      +
    115E  ALA*     3.0    26.3    +      -       -      +
    134E  LEU*     4.3    15.9    -      -       +      -
----------------------------------------------------------
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Residues in contact with ASP 112 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    108E  GLN*     2.8    50.9    +      -       -      +
    109E  ALA*     3.7     7.4    -      -       -      +
    111E  LEU*     1.3    69.1    -      -       -      +
    113E  LEU*     1.3    66.2    +      -       -      +
    115E  ALA*     3.0     8.9    +      -       -      +
    116E  LEU*     2.9    22.2    +      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 113 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     12E  VAL*     4.4     9.6    -      -       +      -
     15E  ALA*     3.6    30.1    -      -       +      +
     16E  VAL*     4.2    20.6    -      -       +      +
     19E  LEU*     3.5    30.5    -      -       +      -
     65E  LEU*     5.0     0.9    -      -       +      -
    109E  ALA      2.9    17.5    +      -       -      +
    110E  LEU*     3.1     4.7    +      -       -      +
    112E  ASP*     1.3    74.9    -      -       -      +
    114E  HIS*     1.3    64.0    +      -       -      +
    116E  LEU*     3.1    12.1    +      -       +      +
    117E  GLY*     2.9    20.4    +      -       -      -
    125E  LEU*     3.9    17.9    -      -       +      +
    129E  LEU*     3.7    24.2    -      -       +      -
----------------------------------------------------------
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Residues in contact with HIS 114 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    123D  PRO*     3.4    33.7    -      -       +      +
    110E  LEU      2.7    20.7    +      -       -      +
    111E  LEU*     3.5     9.0    -      -       -      +
    113E  LEU*     1.3    74.0    -      -       -      +
    115E  ALA*     1.3    62.3    +      -       -      +
    117E  GLY*     3.3     2.9    +      -       -      +
    118E  SER*     3.1    23.6    +      -       -      -
    125E  LEU*     5.4     0.2    -      -       -      -
    126E  CYS*     3.8    35.6    +      -       +      +
    129E  LEU*     3.7    13.4    -      -       +      +
    130E  GLU*     2.8    28.6    +      -       -      -
    134E  LEU*     3.7    15.5    -      -       +      -
----------------------------------------------------------
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Residues in contact with ALA 115 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    121D  ALA*     6.4     2.7    -      -       +      -
    111E  LEU      3.0    13.8    +      -       -      +
    112E  ASP*     3.0    12.1    +      -       -      +
    114E  HIS*     1.3    73.7    +      -       -      +
    116E  LEU*     1.3    59.9    +      -       -      +
    118E  SER*     2.8    12.8    +      -       -      -
    119E  ALA*     2.8    29.3    +      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 116 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     11E  GLU*     3.7    36.3    -      -       +      +
     12E  VAL*     4.0     8.3    -      -       +      -
     15E  ALA*     3.9    18.8    -      -       +      -
     18E  ARG*     6.1     0.2    -      -       -      +
    112E  ASP      2.9    12.3    +      -       -      +
    113E  LEU*     3.3    11.2    -      -       +      +
    115E  ALA*     1.3    74.0    -      -       -      +
    117E  GLY*     1.3    57.1    +      -       -      +
    119E  ALA*     3.1     7.6    +      -       +      +
    120E  GLN*     2.8    62.1    +      -       +      +
----------------------------------------------------------
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Residues in contact with GLY 117 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     12E  VAL*     4.5     3.4    -      -       -      -
    113E  LEU      2.9    10.9    +      -       -      -
    114E  HIS      3.7     4.0    -      -       -      -
    115E  ALA      3.2     0.4    -      -       -      -
    116E  LEU*     1.3    77.7    -      -       -      +
    118E  SER*     1.3    53.5    +      -       -      +
    120E  GLN      3.4     1.2    +      -       -      -
    121E  ALA      3.0     7.6    +      -       -      -
    122E  ASP*     2.7    34.6    +      -       -      +
    125E  LEU*     3.7    25.3    -      -       -      +
    126E  CYS*     3.7    10.1    -      -       -      -
----------------------------------------------------------
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Residues in contact with SER 118 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    114E  HIS*     3.1    18.8    +      -       -      -
    115E  ALA*     2.8    21.7    +      -       -      -
    117E  GLY*     1.3    71.8    -      -       -      +
    119E  ALA*     1.3    65.0    +      -       -      +
    121E  ALA*     3.0    15.7    +      -       -      +
    122E  ASP      4.7     0.2    -      -       -      +
    126E  CYS*     3.5    12.8    -      -       -      -
----------------------------------------------------------
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Residues in contact with ALA 119 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    115E  ALA      2.8    16.5    +      -       -      +
    116E  LEU*     3.5    14.6    -      -       +      +
    118E  SER*     1.3    72.4    +      -       -      +
    120E  GLN*     1.3    66.3    +      -       +      +
    121E  ALA*     3.3     2.4    +      -       -      +
----------------------------------------------------------
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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