Contacts of the helix formed by residues 105 - 132 (chain E) in PDB entry 2R6C


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 TYR 105 (chain E).
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     16E  ALA*     4.3     7.6    -      -       +      +
     19E  ALA*     3.6    24.7    -      -       +      -
     20E  VAL*     3.8    13.2    -      -       +      -
     96E  VAL*     6.0     2.5    -      -       +      -
     98E  THR      5.4     1.3    -      -       -      -
    101E  ASN*     3.2    42.0    -      -       +      -
    102E  VAL*     3.1    19.1    -      -       -      +
    104E  TYR*     1.3    71.0    +      +       -      -
    106E  ALA*     1.3    70.5    +      -       -      +
    108E  ILE*     3.0    15.3    +      -       +      +
    109E  VAL*     2.9    25.3    +      -       -      +
     66F  ASP*     2.4    29.9    +      -       -      -
     68F  VAL*     2.9    46.5    +      -       +      +
     69F  THR*     3.6     8.7    -      -       -      -
----------------------------------------------------------
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Residues in contact with ALA 106 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     20E  VAL*     3.5     8.9    -      -       +      +
     34E  ALA*     4.5     8.7    -      -       -      -
     37E  ILE*     3.7    25.6    -      -       +      -
     38E  LEU*     3.9    17.6    -      -       +      +
    102E  VAL      2.6    23.7    +      -       -      +
    103E  GLU*     3.7    12.6    -      -       -      -
    104E  TYR*     3.2     0.4    -      -       -      +
    105E  TYR*     1.3    72.6    -      -       -      +
    107E  ARG*     1.3    66.5    +      -       -      +
    109E  VAL*     2.9     1.7    +      -       -      +
    110E  GLU*     2.8    22.5    +      -       -      +
----------------------------------------------------------
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Residues in contact with ARG 107 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     37E  ILE*     4.0    14.3    -      -       +      +
    103E  GLU*     3.5    37.5    +      -       -      +
    104E  TYR*     3.1    18.3    -      -       -      +
    106E  ALA*     1.3    79.0    -      -       -      +
    108E  ILE*     1.3    57.3    +      -       +      +
    110E  GLU*     3.8    19.5    -      -       -      +
    111E  GLU*     3.0    40.2    +      -       +      +
----------------------------------------------------------
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Residues in contact with ILE 108 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     16E  ALA*     3.5    19.1    -      -       +      -
    104E  TYR      3.6     6.7    +      -       -      +
    105E  TYR*     3.0    35.1    +      -       +      +
    106E  ALA      3.0     1.2    -      -       -      -
    107E  ARG*     1.3    74.2    -      -       +      +
    109E  VAL*     1.3    67.2    +      -       -      +
    111E  GLU*     3.1    14.4    +      -       -      +
    112E  LYS*     2.9    46.6    +      -       +      +
     63F  GLU*     4.7     8.5    -      -       -      +
     69F  THR*     4.6    14.4    -      -       -      +
     72F  ALA*     3.9    28.9    -      -       +      -
----------------------------------------------------------
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Residues in contact with VAL 109 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     16E  ALA*     3.9     7.4    -      -       +      +
     17E  GLU*     3.7    50.7    -      -       +      +
     20E  VAL*     4.8     4.9    -      -       +      -
     38E  LEU*     3.8    16.6    -      -       +      -
     42E  ASP      3.4    23.0    -      -       -      +
     43E  PHE*     4.2     6.3    -      -       +      -
    105E  TYR      2.9    14.8    +      -       -      +
    106E  ALA      3.7     4.0    -      -       -      +
    108E  ILE*     1.3    75.1    -      -       -      +
    110E  GLU*     1.3    53.5    +      -       -      +
    112E  LYS*     3.4     7.2    +      -       +      +
    113E  SER*     2.8    33.0    +      -       -      -
    116E  ARG*     4.9     0.8    +      -       -      +
----------------------------------------------------------
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Residues in contact with GLU 110 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     37E  ILE*     3.7    31.3    -      -       +      +
     38E  LEU*     3.8    10.0    -      -       +      +
     42E  ASP*     4.7     7.0    -      -       -      +
    106E  ALA      2.8    16.6    +      -       -      +
    107E  ARG*     3.8    21.1    -      -       -      +
    109E  VAL*     1.3    76.2    -      -       -      +
    111E  GLU*     1.3    67.3    +      -       -      +
    113E  SER*     3.4     7.7    -      -       -      -
    114E  VAL*     3.2    42.3    +      -       +      +
    117E  ARG*     6.2     0.7    -      -       -      +
----------------------------------------------------------
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Residues in contact with GLU 111 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    133B  GLU      4.9     2.8    -      -       -      +
    134B  ASP      5.8     0.3    +      -       -      -
    135B  GLU      5.3     0.2    -      -       -      +
    136B  ILE*     3.6    43.7    -      -       +      +
    137B  ASP*     4.9     7.1    -      -       -      +
    107E  ARG*     3.0    27.1    +      -       +      +
    108E  ILE*     3.4    12.9    -      -       -      +
    110E  GLU*     1.3    79.1    -      -       -      +
    112E  LYS*     1.3    61.9    +      -       +      +
    113E  SER      2.9     3.4    -      -       -      -
    114E  VAL*     2.7    30.6    +      -       -      +
    115E  LEU*     3.1    11.1    +      -       -      +
----------------------------------------------------------
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Residues in contact with LYS 112 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    133B  GLU*     3.2    59.1    +      -       +      +
    108E  ILE*     2.9    34.7    +      -       +      +
    109E  VAL*     4.0     5.4    -      -       +      +
    111E  GLU*     1.3    79.7    -      -       -      +
    113E  SER*     1.3    59.9    +      -       -      +
    115E  LEU*     4.0    10.6    -      -       +      +
    116E  ARG*     2.8    38.0    +      -       -      +
     72F  ALA*     4.5     8.7    +      -       -      +
     75F  ALA*     5.8     1.4    -      -       -      +
     76F  ALA*     4.3    15.6    -      -       -      +
----------------------------------------------------------
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Residues in contact with SER 113 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     41E  GLU      4.8     0.9    +      -       -      -
     42E  ASP*     3.0    41.4    +      -       -      -
    109E  VAL      2.8    17.3    +      -       -      -
    110E  GLU      3.4     8.1    -      -       -      -
    111E  GLU      2.8     1.0    +      -       -      -
    112E  LYS*     1.3    76.7    -      -       -      +
    114E  VAL*     1.3    64.3    +      -       -      -
    116E  ARG*     3.1    19.3    +      -       -      +
    117E  ARG*     3.1    32.6    +      -       -      +
----------------------------------------------------------
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Residues in contact with VAL 114 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    136B  ILE*     4.0    12.1    -      -       +      -
    140B  LEU*     3.5    38.6    -      -       +      -
    110E  GLU*     3.2    30.1    -      -       +      +
    111E  GLU*     2.7    14.3    +      -       -      +
    113E  SER*     1.3    71.1    -      -       -      +
    115E  LEU*     1.3    58.2    +      -       +      +
    117E  ARG*     3.1    34.7    +      -       +      +
    118E  LEU*     2.8    27.4    +      -       +      +
----------------------------------------------------------
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Residues in contact with LEU 115 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    129B  GLY*     3.9    13.7    -      -       -      +
    133B  GLU*     3.2    39.7    -      -       +      +
    136B  ILE*     3.6    39.9    -      -       +      +
    139B  LEU*     3.5    28.9    -      -       +      -
    140B  LEU*     6.3     0.7    -      -       +      -
    111E  GLU      3.1     6.3    +      -       -      +
    112E  LYS*     4.0    14.4    -      -       +      +
    113E  SER      3.3     0.2    -      -       -      -
    114E  VAL*     1.3    76.4    -      -       +      +
    116E  ARG*     1.3    60.1    +      -       +      +
    118E  LEU*     3.4    11.9    +      -       +      +
    119E  ILE*     2.9    35.9    +      -       +      +
----------------------------------------------------------
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Residues in contact with ARG 116 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     17E  GLU*     5.3     0.8    +      -       -      -
     41E  GLU      3.8     7.9    +      -       -      -
     42E  ASP      3.0    31.7    +      -       -      -
     43E  PHE      4.1     0.2    +      -       -      -
     44E  TYR*     3.7    49.7    -      -       -      +
    109E  VAL*     4.9     0.4    +      -       -      +
    112E  LYS*     2.8    41.2    +      -       -      +
    113E  SER*     3.1    17.3    +      -       -      +
    115E  LEU*     1.3    77.4    -      -       +      +
    117E  ARG*     1.3    55.7    +      -       -      +
    119E  ILE*     3.4    11.2    +      -       +      +
    120E  ARG*     2.9    30.0    +      -       -      +
----------------------------------------------------------
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Residues in contact with ARG 117 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    307B  ARG*     5.5     3.8    -      -       -      +
     42E  ASP*     5.0     5.3    +      -       -      -
    110E  GLU*     6.2     0.6    -      -       -      +
    113E  SER*     3.1    26.0    +      -       -      +
    114E  VAL*     3.1    36.0    +      -       +      +
    116E  ARG*     1.3    71.4    -      -       -      +
    118E  LEU*     1.3    61.0    +      -       -      +
    120E  ARG*     3.2     8.8    +      -       -      +
    121E  THR*     2.8    41.5    +      -       +      +
    149E  GLU      4.4    20.8    +      -       -      -
----------------------------------------------------------
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Residues in contact with LEU 118 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    125B  ILE*     3.7    30.7    -      -       +      +
    129B  GLY*     5.2     4.5    -      -       -      -
    139B  LEU*     4.0    29.2    -      -       +      +
    140B  LEU*     4.0    28.3    -      -       +      +
    143B  ALA*     4.2    13.5    -      -       +      -
    114E  VAL*     2.8    13.0    +      -       +      +
    115E  LEU*     3.5    20.6    -      -       +      +
    117E  ARG*     1.3    76.3    -      -       -      +
    119E  ILE*     1.3    64.6    +      -       -      +
    121E  THR*     3.5     5.1    +      -       -      -
    122E  ALA*     2.8    27.1    +      -       -      +
    147E  ILE*     4.3    15.3    -      -       +      +
----------------------------------------------------------
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Residues in contact with ILE 119 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    126B  ALA*     4.1    12.8    -      -       +      +
    129B  GLY*     3.9    30.7    -      -       -      +
    130B  TYR*     3.5    48.9    -      -       +      +
    115E  LEU*     2.9    23.9    +      -       +      +
    116E  ARG*     3.6     9.9    -      -       +      +
    118E  LEU*     1.3    77.7    -      -       +      +
    120E  ARG*     1.3    53.9    +      -       -      +
    122E  ALA*     3.7     3.7    -      -       -      +
    123E  THR*     2.7    51.3    +      -       -      +
----------------------------------------------------------
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Residues in contact with ARG 120 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    116E  ARG      2.9    17.7    +      -       -      +
    117E  ARG*     3.6     9.6    -      -       -      +
    119E  ILE*     1.3    79.7    -      -       -      +
    121E  THR*     1.3    59.9    +      -       +      +
    123E  THR*     3.9     4.5    -      -       -      -
    124E  SER*     2.9    31.0    +      -       -      -
----------------------------------------------------------
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Residues in contact with THR 121 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    117E  ARG*     2.8    30.2    +      -       +      +
    118E  LEU*     3.5     5.9    +      -       -      -
    120E  ARG*     1.3    75.5    -      -       +      +
    122E  ALA*     1.3    60.0    +      -       -      +
    124E  SER*     3.8     8.4    +      -       -      -
    125E  ILE*     3.2    29.8    +      -       -      +
    146E  LYS*     3.8    38.3    +      -       +      +
    147E  ILE*     4.0    12.9    -      -       -      +
    149E  GLU*     6.2     2.5    -      -       +      -
----------------------------------------------------------
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Residues in contact with ALA 122 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    122B  ALA*     4.1    20.7    -      -       -      +
    125B  ILE*     4.1    25.1    -      -       +      -
    126B  ALA*     4.3     6.5    -      -       +      +
    118E  LEU      2.8    19.8    +      -       -      +
    119E  ILE      3.7     2.7    -      -       -      +
    121E  THR*     1.3    76.9    +      -       -      +
    123E  THR*     1.3    65.4    +      -       -      +
    125E  ILE*     2.9    21.2    +      -       -      +
    126E  ALA*     3.1    11.3    +      -       -      +
    147E  ILE*     5.1     6.7    -      -       +      -
----------------------------------------------------------
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Residues in contact with THR 123 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    126B  ALA*     3.9    13.9    -      -       -      +
    119E  ILE*     2.7    39.7    +      -       -      +
    120E  ARG*     3.9     4.3    -      -       -      -
    122E  ALA*     1.3    72.0    -      -       -      +
    124E  SER*     1.3    53.2    +      -       -      +
    126E  ALA*     3.0    10.5    +      -       +      +
    127E  GLN*     2.8    38.5    +      -       +      +
----------------------------------------------------------
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Residues in contact with SER 124 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    120E  ARG*     2.9    21.2    +      -       -      -
    121E  THR*     3.8    10.1    -      -       -      -
    122E  ALA      3.2     0.2    -      -       -      -
    123E  THR*     1.3    75.3    -      -       -      +
    125E  ILE*     1.3    56.5    +      -       -      +
    127E  GLN*     4.3     8.1    -      -       -      -
    128E  ASP*     3.0    36.8    +      -       -      +
    146E  LYS*     4.4    17.3    +      -       -      +
----------------------------------------------------------
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Residues in contact with ILE 125 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    118B  LEU*     4.1    27.7    -      -       +      +
    119B  ILE*     5.5     0.6    -      -       -      +
    122B  ALA*     4.0    18.4    -      -       +      -
    147B  ILE*     4.8     6.5    -      -       +      -
    121E  THR      3.2    16.5    +      -       -      +
    122E  ALA*     2.9    12.3    +      -       -      +
    124E  SER*     1.3    76.3    -      -       -      +
    126E  ALA*     1.3    60.1    +      -       -      +
    128E  ASP*     3.3     6.4    +      -       -      +
    129E  GLY*     2.9    24.9    +      -       -      -
    139E  LEU*     4.6     5.1    -      -       +      +
    142E  GLU      5.3     0.2    -      -       -      +
    143E  ALA*     3.7    41.5    -      -       +      +
    146E  LYS*     4.8    13.5    -      -       +      +
    147E  ILE*     4.1    15.5    -      -       +      -
----------------------------------------------------------
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Residues in contact with ALA 126 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    119B  ILE*     4.6    12.1    -      -       +      +
    122B  ALA*     4.6     8.0    -      -       +      +
    123B  THR*     4.5    19.7    -      -       +      +
    122E  ALA      3.1     9.7    +      -       -      +
    123E  THR*     3.0    13.1    +      -       +      +
    125E  ILE*     1.3    74.0    -      -       -      +
    127E  GLN*     1.3    59.4    +      -       -      +
    129E  GLY*     2.6    26.8    +      -       -      -
    130E  TYR*     3.3    18.8    -      -       +      -
----------------------------------------------------------
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Residues in contact with GLN 127 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    123E  THR*     2.8    24.3    +      -       +      +
    124E  SER*     4.3     7.4    -      -       -      +
    126E  ALA*     1.3    73.2    -      -       -      +
    128E  ASP*     1.3    67.3    +      -       -      +
    129E  GLY      3.3     0.5    +      -       -      -
    130E  TYR*     3.7    15.3    +      -       -      -
    131E  THR*     3.7    24.6    -      -       +      +
----------------------------------------------------------
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Residues in contact with ASP 128 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    124E  SER*     3.0    31.4    +      -       -      +
    125E  ILE*     3.5     7.2    -      -       -      +
    126E  ALA      3.1     1.2    -      -       -      -
    127E  GLN*     1.3    82.0    -      -       -      +
    129E  GLY*     1.3    62.4    +      -       -      +
    130E  TYR      3.2     2.4    +      -       -      -
    131E  THR*     4.0    12.3    +      -       -      -
    132E  ARG*     3.0    53.0    +      -       -      +
    139E  LEU*     3.7    20.5    -      -       +      +
    146E  LYS*     4.4    12.4    +      -       -      +
----------------------------------------------------------
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Residues in contact with GLY 129 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    115B  LEU*     4.5    12.2    -      -       -      +
    118B  LEU*     5.4     2.5    -      -       -      -
    119B  ILE*     4.4    16.9    -      -       -      +
    125E  ILE      2.9     9.3    +      -       -      -
    126E  ALA      2.6    21.0    +      -       -      -
    128E  ASP*     1.3    72.7    -      -       -      +
    130E  TYR*     1.3    59.9    +      -       -      -
    132E  ARG      4.8     0.4    +      -       -      -
    133E  GLU*     4.2    15.8    -      -       -      +
    139E  LEU*     4.4    15.4    -      -       -      +
----------------------------------------------------------
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Residues in contact with TYR 130 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    119B  ILE*     3.3    38.4    -      -       +      +
    126E  ALA*     3.3    26.9    -      -       +      -
    127E  GLN*     3.7     9.6    +      -       -      +
    128E  ASP      3.2     0.2    -      -       -      -
    129E  GLY*     1.3    77.4    -      -       -      +
    131E  THR*     1.3    65.5    +      -       +      +
    132E  ARG      3.5     8.6    -      -       -      +
    133E  GLU*     4.3    13.5    -      -       -      +
----------------------------------------------------------
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Residues in contact with THR 131 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    127E  GLN*     3.7    30.3    -      -       +      +
    128E  ASP*     3.7    17.5    +      -       -      -
    130E  TYR*     1.3    78.5    -      -       +      +
    132E  ARG*     1.3    71.3    +      -       -      +
    134E  ASP*     4.2     6.1    -      -       -      +
----------------------------------------------------------
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Residues in contact with ARG 132 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    128E  ASP*     3.0    33.9    +      -       -      +
    129E  GLY      5.2     0.2    -      -       -      -
    130E  TYR      3.5     4.7    -      -       -      +
    131E  THR*     1.3    89.6    -      -       -      +
    133E  GLU*     1.3    75.8    +      -       -      +
    134E  ASP*     3.3    13.1    -      -       -      +
    135E  GLU*     2.6    46.9    +      -       +      +
    138E  VAL*     5.4     0.2    -      -       -      +
    139E  LEU*     3.5    36.0    -      -       +      +
    142E  GLU*     3.2    29.6    +      -       -      -
    146E  LYS*     5.1     0.4    -      -       -      +
----------------------------------------------------------
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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