Contacts of the helix formed by residues 100 - 125 (chain C) in PDB entry 1CD9


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 LEU 100 (chain C).
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     32C  LEU*     3.8    18.6    -      -       +      -
     35C  LYS*     3.8    25.1    -      -       +      -
     36C  LEU*     3.1    39.7    -      -       +      +
     39C  THR*     4.2     7.0    -      -       +      -
     40C  TYR*     3.9    23.6    -      -       +      +
     95C  GLY      3.8     8.5    -      -       -      +
     96C  ILE*     4.2    11.9    -      -       +      -
     97C  SER*     2.9     9.5    +      -       -      +
     99C  GLU*     1.3    91.1    -      -       +      +
    101C  GLY*     1.3    64.8    +      -       -      +
    102C  PRO*     3.2     4.3    -      -       -      -
    103C  THR*     3.0     8.2    +      -       -      +
    104C  LEU*     2.9    21.5    +      -       +      +
----------------------------------------------------------
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Residues in contact with GLY 101 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     95C  GLY*     3.4    20.9    +      -       -      -
     97C  SER      2.8    16.1    +      -       -      -
     98C  PRO*     3.8     2.7    +      -       -      -
    100C  LEU*     1.3    71.6    -      -       -      +
    102C  PRO*     1.3    63.3    -      -       -      +
    104C  LEU*     3.8     1.1    -      -       -      +
    105C  ASP*     2.8    33.3    +      -       -      +
----------------------------------------------------------
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Residues in contact with PRO 102 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     98C  PRO      3.7    15.0    -      -       -      +
     99C  GLU      4.0     6.1    -      -       -      +
    100C  LEU      3.4     4.5    -      -       -      -
    101C  GLY*     1.3    86.3    -      -       -      +
    103C  THR*     1.3    65.6    +      -       -      +
    105C  ASP*     3.1     8.1    +      -       +      +
    106C  THR*     3.1    25.7    +      -       -      -
----------------------------------------------------------
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Residues in contact with THR 103 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     28C  ASP*     4.6     2.6    -      -       -      +
     31C  ALA*     3.9    15.9    -      -       +      +
     32C  LEU*     3.7    39.7    -      -       +      +
     35C  LYS*     4.2    24.7    -      -       +      +
     99C  GLU      4.9     1.9    +      -       -      -
    100C  LEU      3.0     8.5    +      -       -      -
    102C  PRO*     1.3    80.0    -      -       -      +
    104C  LEU*     1.3    61.4    +      -       -      +
    106C  THR*     3.5     7.7    +      -       -      -
    107C  LEU*     3.4    18.7    +      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 104 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     32C  LEU*     3.8    32.7    -      -       +      +
     90C  LEU*     3.9    40.4    -      -       +      +
     93C  LEU*     4.1     8.7    -      -       +      -
     95C  GLY*     3.6    37.5    -      -       -      +
     96C  ILE*     3.8    13.5    -      -       +      -
    100C  LEU      2.9    15.9    +      -       -      +
    101C  GLY      3.9     2.9    -      -       -      +
    103C  THR*     1.3    75.1    -      -       -      +
    105C  ASP*     1.3    61.5    +      -       -      +
    107C  LEU*     3.0     7.6    +      -       +      +
    108C  GLN*     2.8    29.5    +      -       +      +
----------------------------------------------------------
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Residues in contact with ASP 105 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    101C  GLY      2.8    19.0    +      -       -      +
    102C  PRO*     3.5     7.0    -      -       +      +
    104C  LEU*     1.3    75.9    -      -       -      +
    106C  THR*     1.3    63.7    +      -       -      +
    108C  GLN*     3.6    10.6    -      -       -      +
    109C  LEU*     2.9    47.1    +      -       -      +
     73D  LYS*     5.0     6.6    -      -       -      +
----------------------------------------------------------
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Residues in contact with THR 106 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     28C  ASP*     3.7    17.0    -      -       +      +
    102C  PRO      3.1    13.0    +      -       -      -
    103C  THR*     3.7    11.2    -      -       -      -
    104C  LEU      3.1     0.2    -      -       -      -
    105C  ASP*     1.3    77.2    -      -       -      +
    107C  LEU*     1.3    63.2    +      -       -      +
    109C  LEU*     3.3     7.4    +      -       -      +
    110C  ASP*     3.1    38.7    +      -       -      +
     20D  ASN*     4.8    15.0    +      -       -      +
     72D  ARG*     5.2     5.3    -      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 107 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     25C  ILE*     3.6    32.5    -      -       +      +
     28C  ASP*     3.7    26.9    -      -       +      +
     29C  GLY*     4.1    14.4    -      -       -      +
     32C  LEU*     3.8    27.6    -      -       +      -
     90C  LEU*     3.9    23.8    -      -       +      -
    103C  THR      3.4     9.4    +      -       -      +
    104C  LEU*     3.0    10.4    +      -       +      +
    106C  THR*     1.3    80.2    -      -       -      +
    108C  GLN*     1.3    62.2    +      -       -      +
    110C  ASP*     3.5     0.7    +      -       -      +
    111C  VAL*     3.1    22.7    +      -       +      +
    155C  ALA*     5.4     2.9    -      -       +      -
    158C  LEU*     4.0    12.3    -      -       +      -
----------------------------------------------------------
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Residues in contact with GLN 108 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     87C  GLN*     3.1    46.5    +      -       -      +
     90C  LEU*     4.2    30.7    -      -       +      +
     91C  GLN*     3.6    24.3    +      -       +      +
    104C  LEU*     2.8    17.8    +      -       +      +
    105C  ASP*     3.6    14.3    -      -       -      +
    106C  THR      3.2     0.2    -      -       -      -
    107C  LEU*     1.3    74.1    -      -       -      +
    109C  LEU*     1.3    71.7    +      -       -      +
    111C  VAL*     3.2     2.3    +      -       -      +
    112C  ALA*     2.8    30.9    +      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 109 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    105C  ASP*     2.9    41.9    +      -       -      +
    106C  THR*     3.8     2.2    -      -       -      +
    108C  GLN*     1.3    85.0    -      -       -      +
    110C  ASP*     1.3    63.9    +      -       -      +
    112C  ALA*     3.1     5.2    +      -       +      +
    113C  ASP*     2.9    32.7    +      -       -      +
     72D  ARG*     3.5    35.4    -      -       +      +
     73D  LYS*     4.1    33.0    -      -       +      +
     75D  LEU      5.8     1.3    -      -       -      +
----------------------------------------------------------
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Residues in contact with ASP 110 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     21C  GLN*     4.6     2.4    +      -       -      +
     24C  LYS*     3.4    30.4    +      -       +      +
     25C  ILE*     3.5    17.9    -      -       +      +
     28C  ASP*     2.5    29.8    -      -       -      +
    106C  THR*     3.1    25.3    +      -       -      +
    107C  LEU      3.9     3.1    -      -       -      +
    109C  LEU*     1.3    76.7    -      -       -      +
    111C  VAL*     1.3    61.2    +      -       -      +
    113C  ASP*     4.1     4.4    -      -       -      +
    114C  PHE*     3.2    22.7    +      -       -      +
     20D  ASN*     5.7     0.3    -      -       -      +
     72D  ARG*     2.8    22.1    +      -       -      +
     77D  LEU*     3.9     4.9    -      -       -      +
     78D  TYR*     5.7     0.9    -      -       -      -
----------------------------------------------------------
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Residues in contact with VAL 111 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     25C  ILE*     4.0    19.1    -      -       +      -
     83C  LEU*     3.4    37.5    -      -       +      +
     86C  TYR*     4.6     3.8    -      -       +      -
     87C  GLN*     4.1    14.8    -      -       +      +
     90C  LEU*     4.0    13.7    -      -       +      -
    107C  LEU*     3.1    34.9    +      -       +      +
    108C  GLN      3.6     4.5    -      -       -      +
    109C  LEU      3.1     0.2    -      -       -      -
    110C  ASP*     1.3    74.8    -      -       -      +
    112C  ALA*     1.3    68.1    +      -       -      +
    114C  PHE*     3.3     2.3    +      -       -      +
    115C  ALA*     3.0    21.1    +      -       -      +
    158C  LEU*     4.0     9.6    -      -       +      -
----------------------------------------------------------
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Residues in contact with ALA 112 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     87C  GLN*     3.6    31.1    +      -       +      +
    108C  GLN*     2.8    21.5    +      -       -      +
    109C  LEU*     3.1    12.1    +      -       +      +
    111C  VAL*     1.3    78.4    -      -       -      +
    113C  ASP*     1.3    62.5    +      -       -      +
    115C  ALA*     3.2     5.5    +      -       -      +
    116C  THR*     2.9    32.6    +      -       -      +
----------------------------------------------------------
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Residues in contact with ASP 113 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     21C  GLN*     3.9     5.8    -      -       -      +
    109C  LEU*     2.9    20.3    +      -       -      +
    110C  ASP*     4.1     5.8    -      -       -      +
    112C  ALA*     1.3    78.3    -      -       -      +
    114C  PHE*     1.3    62.2    +      -       -      +
    116C  THR*     3.4     3.1    +      -       -      -
    117C  THR*     2.8    34.8    +      -       -      -
     72D  ARG*     3.1    17.7    +      -       -      -
     75D  LEU      5.1     0.2    -      -       -      +
     76D  LEU*     3.2    29.1    -      -       +      +
     77D  LEU*     2.9    37.3    +      -       +      +
----------------------------------------------------------
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Residues in contact with PHE 114 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     18C  CYS*     3.7    38.4    -      -       +      -
     21C  GLN*     3.2    33.8    -      -       +      +
     22C  VAL*     3.7    24.7    -      -       +      -
     25C  ILE*     3.7    20.9    -      -       +      -
     79C  LEU*     4.7     5.6    -      -       +      -
     83C  LEU*     3.3    25.1    -      -       +      -
    110C  ASP      3.2    15.9    +      -       -      +
    111C  VAL      3.7     4.3    -      -       -      +
    112C  ALA      3.3     0.2    -      -       -      -
    113C  ASP*     1.3    79.1    -      -       -      +
    115C  ALA*     1.3    61.8    +      -       -      +
    117C  THR*     3.6     0.8    +      -       +      -
    118C  ILE*     3.2    45.1    +      -       +      +
    162C  LEU*     4.9     1.6    -      -       +      -
    169C  LEU*     4.7     5.2    -      -       +      -
----------------------------------------------------------
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Residues in contact with ALA 115 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     80C  HIS*     3.2    29.2    -      -       +      +
     83C  LEU*     4.0    24.8    -      -       +      +
     84C  PHE*     4.5     4.3    -      -       -      +
     87C  GLN*     4.0    16.2    -      -       -      +
    111C  VAL      3.0    13.4    +      -       -      +
    112C  ALA      3.4     8.3    -      -       -      +
    113C  ASP      3.1     0.2    -      -       -      -
    114C  PHE*     1.3    78.4    -      -       -      +
    116C  THR*     1.3    61.9    +      -       -      +
    118C  ILE*     3.3     3.4    +      -       -      +
    119C  TRP*     3.0    17.7    +      -       -      +
----------------------------------------------------------
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Residues in contact with THR 116 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     80C  HIS*     5.7     0.2    -      -       -      -
     87C  GLN*     5.6     0.3    +      -       -      -
    112C  ALA*     2.9    16.7    +      -       -      +
    113C  ASP*     3.4    11.9    +      -       -      -
    115C  ALA*     1.3    73.6    -      -       -      +
    117C  THR*     1.3    66.8    +      -       -      +
    119C  TRP*     3.0     8.1    +      -       +      +
    120C  GLN*     2.9    52.7    +      -       +      +
     76D  LEU*     4.6    19.5    -      -       +      +
----------------------------------------------------------
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Residues in contact with THR 117 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     14C  PHE*     4.3    17.7    -      -       +      -
     17C  LYS*     5.8     5.4    -      -       +      -
     18C  CYS*     5.1     1.1    -      -       -      -
     21C  GLN*     3.1    23.1    +      -       -      +
    113C  ASP      2.8    22.0    +      -       -      -
    114C  PHE*     3.7     7.4    -      -       +      +
    116C  THR*     1.3    73.5    -      -       -      +
    118C  ILE*     1.3    64.0    +      -       +      +
    120C  GLN*     3.5     9.3    +      -       -      +
    121C  GLN*     3.1    23.4    +      -       -      +
     76D  LEU*     5.2     1.7    -      -       -      +
     77D  LEU      4.2     3.3    +      -       -      -
     78D  TYR*     3.6    31.9    +      -       +      +
     79D  GLN*     5.4     2.5    -      -       -      +
----------------------------------------------------------
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Residues in contact with ILE 118 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     14C  PHE*     4.4     8.1    -      -       +      -
     18C  CYS*     4.6    10.3    -      -       -      -
     76C  LEU*     4.2    22.7    -      -       +      +
     79C  LEU*     4.0    25.6    -      -       +      -
     80C  HIS*     4.1    20.0    -      -       +      +
     83C  LEU*     4.0    14.8    -      -       +      -
    114C  PHE*     3.2    44.0    +      -       +      +
    115C  ALA      3.6     6.1    -      -       -      +
    116C  THR      3.2     0.2    -      -       -      -
    117C  THR*     1.3    73.2    -      -       -      +
    119C  TRP*     1.3    66.6    -      -       -      +
    121C  GLN*     3.3     2.3    +      -       -      +
    122C  MET*     3.0    32.3    +      -       +      +
----------------------------------------------------------
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Residues in contact with TRP 119 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     80C  HIS*     3.9    25.8    -      +       +      +
    115C  ALA      3.0    13.0    +      -       -      +
    116C  THR*     3.0    11.4    +      -       +      +
    118C  ILE*     1.3    76.6    -      -       -      +
    120C  GLN*     1.3    63.9    +      -       +      +
    122C  MET*     3.0    26.6    +      -       +      +
    123C  GLU*     2.9    61.4    +      -       +      +
    128C  ALA*     4.3     5.8    -      -       +      -
    129C  PRO*     3.6    41.3    -      -       +      -
    132C  GLN*     3.2    35.5    +      -       +      -
    133C  PRO*     4.2    23.1    -      -       +      -
----------------------------------------------------------
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Residues in contact with GLN 120 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    116C  THR*     2.9    36.5    +      -       +      +
    117C  THR*     3.9     7.5    -      -       -      +
    119C  TRP*     1.3    82.2    -      -       +      +
    121C  GLN*     1.3    61.9    +      -       -      +
    123C  GLU*     3.4    14.0    +      -       -      +
    124C  GLU*     3.1    24.2    +      -       -      +
     46D  ARG*     4.0    28.5    +      -       -      +
     76D  LEU*     5.4     3.0    -      -       -      +
     79D  GLN*     3.0    35.2    -      -       -      +
----------------------------------------------------------
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Residues in contact with GLN 121 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     10C  LEU*     4.8     0.9    -      -       +      -
     11C  PRO*     3.5    26.2    -      -       -      +
     14C  PHE*     3.4    56.8    -      -       +      +
     76C  LEU*     5.3     0.9    -      -       +      -
    117C  THR      3.1    11.8    +      -       -      +
    118C  ILE      3.6     2.7    -      -       -      +
    119C  TRP      3.2     0.2    -      -       -      -
    120C  GLN*     1.3    73.4    -      -       -      +
    122C  MET*     1.3    67.9    +      -       +      +
    124C  GLU*     3.1    30.5    +      -       -      +
    125C  LEU*     3.1    40.4    +      -       +      +
----------------------------------------------------------
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Residues in contact with MET 122 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     73C  ALA      4.2     6.7    -      -       -      +
     76C  LEU*     3.5    41.1    -      -       +      -
     77C  SER*     3.7    14.1    -      -       -      -
     80C  HIS*     4.4    13.7    -      -       +      -
    118C  ILE*     3.0    14.6    +      -       +      +
    119C  TRP*     3.0    41.6    +      -       +      +
    121C  GLN*     1.3    78.1    -      -       -      +
    123C  GLU*     1.3    60.6    +      -       -      +
    125C  LEU*     3.3     3.0    +      -       -      +
    126C  GLY      2.9     3.3    +      -       -      -
    127C  MET*     2.8    38.4    +      -       +      +
    128C  ALA*     3.8    13.5    -      -       -      +
    129C  PRO*     3.5    21.5    -      -       +      -
----------------------------------------------------------
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Residues in contact with GLU 123 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    160B  ASN*     4.8     3.3    +      -       -      -
    119C  TRP*     2.9    52.0    +      -       -      +
    120C  GLN*     3.7    12.0    -      -       -      +
    121C  GLN      3.2     0.4    -      -       -      -
    122C  MET*     1.3    75.5    -      -       -      +
    124C  GLU*     1.3    58.6    +      -       -      +
    126C  GLY*     2.8    20.9    +      -       -      -
    128C  ALA*     4.1    15.6    -      -       +      +
    132C  GLN*     5.0     3.8    +      -       -      +
     46D  ARG*     4.6    13.2    +      -       -      +
----------------------------------------------------------
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Residues in contact with GLU 124 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    160B  ASN*     5.2     3.3    +      -       -      +
    161B  TRP      5.0     4.2    -      -       -      +
    163B  LEU*     5.5     4.0    -      -       -      +
    165B  PHE*     6.1     0.5    -      -       -      -
     11C  PRO*     5.7     1.2    -      -       -      +
    120C  GLN      3.1    13.3    +      -       -      +
    121C  GLN*     3.1    34.3    +      -       -      +
    123C  GLU*     1.3    76.4    -      -       -      +
    125C  LEU*     1.3    67.4    +      -       +      +
    126C  GLY      3.7     0.2    +      -       -      -
----------------------------------------------------------
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Residues in contact with LEU 125 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    160B  ASN*     4.7     2.6    +      -       -      -
    161B  TRP      4.5    10.4    -      -       -      +
    162B  THR*     5.2     6.6    +      -       -      +
    163B  LEU*     5.2    12.8    +      -       +      +
    165B  PHE*     4.1    27.1    -      -       +      -
      9C  SER      3.4    11.7    -      -       -      +
     10C  LEU*     3.3    25.1    -      -       +      -
     11C  PRO*     4.6     0.9    -      -       +      -
    121C  GLN*     3.1    32.4    +      -       +      +
    122C  MET*     4.0     0.4    -      -       -      +
    124C  GLU*     1.3    87.0    -      -       +      +
    126C  GLY*     1.3    63.7    -      -       -      +
    127C  MET*     3.2    37.9    +      -       +      +
----------------------------------------------------------
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A short description of the analytical approach
The contact analysis used in this page is based upon the approach developed in: Sobolev V., Wade R.C., Vriend G. and Edelman M. PROTEINS (1996) 25, 120-129. Contact legitimacy depends on the hydrophobic-hydrophilic properties of the contacting atoms. In order to define it, for each inter-atomic contact, eight atom classes have been introduced:


   I  Hydrophilic      - N and O that can donate and accept hydrogen bonds
                         (e.g., oxygen of hydroxyl group of Ser. or Thr)
  II  Acceptor         - N or O that can only accept a hydrogen bond
 III  Donor            - N that can only donate a hydrogen bond
  IV  Hydrophobic      - Cl, Br, I and all C atoms that are not in
                         aromatic rings and do not have a covalent bond to
                         a N or O atom
   V  Aromatic         - C in aromatic rings irrespective of any other 
                         bonds formed by the atom
  VI  Neutral          - C atoms that have a covalent bond to at least one
                         atom of class I or two or more atoms from class II
                         or III; atoms; S, F, P, and metal atoms in all cases
 VII  Neutral-donor    - C atoms that have a covalent bond with only one
                         atom of class III
VIII  Neutral-acceptor - C atoms that have a covalent bond with only 
                         one atom of class II
For each pair of contacts the state of legitimacy is shown below:

Legend:
+, legitimate
-, illegitimate
------------------------------------------------------------
  Atomic class           I  II  III   IV   V   VI  VII  VIII
------------------------------------------------------------
   I  (Hydrophilic)      +   +    +    -   +   +    +    +
  II  (Acceptor)         +   -    +    -   +   +    +    -
 III  (Donor)            +   +    -    -   +   +    -    +
  IV  (Hydrophobic)      -   -    -    +   +   +    +    +
   V  (Aromatic)         +   +    +    +   +   +    +    +
  VI  (Neutral)          +   +    +    +   +   +    +    +
 VII  (Neutral-donor)    +   +    -    +   +   +    -    +
VIII  (Neutral-acceptor) +   -    +    +   +   +    +    -
------------------------------------------------------------
Warning!
Atom classes for heterogroups are automatically assigned based on the atomic coordinates. However, in three cases (see below) the automatic assignment is currently ambiguous. In these cases, the user is advised to manually analyse the full list of contacts using LPC software.
1. Carbon atoms belonging to a 4-, 5- or 6-member ring are 
   considered "aromatic" (Class V) if the ring is approximately
   planar, and "hydrophobic" (Class IV) or "neutral" (Classes
   VI, VII, VIII) if the ring is non-planar.
2. The oxygen atom of a carbonyl or hydroxy group is considered
   "hydroxy" (Class I) if the CO bond is longer than 1.29 Å, and
   "carbonyl" (Class II) if shorter.
3. All nitrogen atoms are considered "hydrophilic" (Class I).

Please E-mail any questions and/or suggestions concerning this page to Vladimir.Sobolev@weizmann.ac.il