Contacts of the helix formed by residues 138 - 161 (chain C) in PDB entry 3E2A


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 SER 138 (chain C).
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    137C  LEU*     1.3    74.4    -      -       -      +
    139C  PRO*     1.3    76.5    -      -       -      +
    140C  GLU*     2.4    34.9    +      -       -      -
    141C  LYS*     3.0    17.3    +      -       -      +
    142C  ARG*     3.5     6.2    +      -       -      +
    219C  ASN*     3.6    35.9    +      -       -      -
----------------------------------------------------------
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Residues in contact with PRO 139 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    108C  MET*     5.2     2.6    -      -       -      +
    137C  LEU      3.3     4.0    -      -       -      +
    138C  SER*     1.3    89.4    -      -       -      +
    140C  GLU*     1.3    63.2    +      -       -      +
    142C  ARG*     3.1    51.1    +      -       -      +
    143C  ALA*     4.5     1.7    +      -       -      +
----------------------------------------------------------
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Residues in contact with GLU 140 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    138C  SER*     2.4    37.5    +      -       -      -
    139C  PRO*     1.3    76.7    -      -       -      +
    141C  LYS*     1.3    74.6    +      -       +      +
    143C  ALA*     5.0     5.1    +      -       -      +
    144C  ASP*     5.5     1.4    +      -       -      +
----------------------------------------------------------
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Residues in contact with LYS 141 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    137C  LEU*     3.9    15.3    -      -       +      +
    138C  SER*     3.0    12.6    +      -       -      +
    140C  GLU*     1.3   100.1    -      -       +      +
    142C  ARG*     1.3    64.7    +      -       -      +
    143C  ALA      3.4     2.6    +      -       -      -
    144C  ASP*     3.6     8.5    +      -       -      +
    145C  MET*     3.3    20.1    +      -       -      +
    218C  GLU*     3.8    38.0    +      -       -      +
    219C  ASN      4.1     9.9    -      -       -      +
----------------------------------------------------------
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Residues in contact with ARG 142 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    108C  MET*     3.6    19.5    -      -       +      -
    127C  TRP*     5.3    12.6    -      -       -      +
    134C  LEU*     3.0    35.2    +      -       +      +
    135C  GLY*     3.3    22.3    +      -       -      -
    137C  LEU*     2.9    32.5    +      -       +      -
    138C  SER      3.9     5.8    -      -       -      +
    139C  PRO*     3.1    42.8    +      -       -      +
    141C  LYS*     1.3    77.4    -      -       -      +
    143C  ALA*     1.3    53.1    +      -       -      +
    145C  MET*     3.2     3.8    +      -       -      +
    146C  LEU*     2.8    36.0    +      -       -      +
----------------------------------------------------------
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Residues in contact with ALA 143 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    104C  ILE*     3.8     2.8    -      -       +      +
    105C  HIS*     3.7    33.7    -      -       +      +
    108C  MET*     3.6    28.0    -      -       +      +
    139C  PRO      4.5     1.6    +      -       -      -
    140C  GLU      5.0     4.2    +      -       -      +
    141C  LYS      3.4     0.4    -      -       -      -
    142C  ARG*     1.3    79.2    -      -       -      +
    144C  ASP*     1.3    52.6    +      -       -      +
    146C  LEU*     3.3     1.7    +      -       -      +
    147C  THR*     2.7    38.8    +      -       -      -
----------------------------------------------------------
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Residues in contact with ASP 144 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     99C  THR*     3.3    31.9    -      -       -      +
    105C  HIS*     5.6     0.2    -      -       -      -
    140C  GLU      5.5     1.1    +      -       -      +
    141C  LYS*     3.6    11.4    +      -       -      +
    142C  ARG      3.4     0.2    -      -       -      -
    143C  ALA*     1.3    77.2    -      -       -      +
    145C  MET*     1.3    62.0    +      -       -      +
    147C  THR*     3.5     7.9    +      -       -      +
    148C  LYS*     3.2    50.4    +      -       -      +
    180C  VAL*     5.4     0.3    -      -       -      +
----------------------------------------------------------
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Residues in contact with MET 145 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    133C  LEU*     3.8     7.4    -      -       +      -
    134C  LEU*     3.5    18.4    -      -       +      -
    137C  LEU*     3.4    30.3    -      -       +      -
    141C  LYS      3.3     3.9    +      -       -      +
    142C  ARG      3.2     5.5    +      -       -      +
    144C  ASP*     1.3    80.2    +      -       -      +
    146C  LEU*     1.3    56.4    +      -       -      +
    148C  LYS*     3.1    19.1    +      -       +      +
    149C  ILE*     3.0    40.2    +      -       +      +
    212C  LEU*     3.8    44.0    -      -       +      +
    215C  LEU*     4.2    14.4    -      -       +      -
----------------------------------------------------------
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Residues in contact with LEU 146 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    104C  ILE*     3.8    12.3    -      -       +      -
    107C  ALA      6.0     0.2    -      -       -      -
    108C  MET*     3.6    32.5    -      -       +      -
    123C  ILE*     3.9    22.9    -      -       +      +
    126C  ILE*     4.2    13.9    -      -       +      -
    127C  TRP*     4.0    30.7    -      -       +      +
    134C  LEU*     4.0    25.1    -      -       +      +
    142C  ARG      2.8    20.9    +      -       -      +
    143C  ALA*     3.8     5.2    -      -       -      +
    145C  MET*     1.3    73.9    -      -       -      +
    147C  THR*     1.3    56.7    +      -       -      +
    149C  ILE*     4.4     5.8    -      -       +      -
    150C  ASN*     2.8    33.6    +      -       +      +
----------------------------------------------------------
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Residues in contact with THR 147 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     97C  GLY*     4.8     2.2    -      -       -      -
     98C  HIS      3.2    41.0    +      -       -      +
     99C  THR*     4.6     2.7    -      -       -      +
    100C  ASN      5.6     0.3    +      -       -      -
    101C  CYS*     4.5     4.9    +      -       +      +
    104C  ILE*     3.8    27.5    -      -       +      +
    105C  HIS*     5.4     1.9    -      -       -      -
    143C  ALA      2.7    22.6    +      -       -      -
    144C  ASP*     3.5    12.8    -      -       -      +
    145C  MET      3.2     0.2    -      -       -      -
    146C  LEU*     1.3    74.8    -      -       -      +
    148C  LYS*     1.3    62.9    +      -       -      +
    150C  ASN*     3.6     4.1    +      -       -      +
    151C  VAL*     3.1    23.7    +      -       -      +
    180C  VAL*     4.4    11.0    -      -       +      -
----------------------------------------------------------
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Residues in contact with LYS 148 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     99C  THR*     6.1     0.4    -      -       -      -
    144C  ASP*     3.2    39.4    +      -       -      +
    145C  MET*     3.1    21.2    +      -       +      +
    147C  THR*     1.3    75.6    -      -       -      +
    149C  ILE*     1.3    64.1    +      -       -      +
    151C  VAL*     3.1    13.9    +      -       -      +
    152C  ALA*     3.2    12.3    +      -       -      +
    180C  VAL*     4.3    16.6    -      -       +      -
    191C  GLN*     3.2    36.4    -      -       -      +
    212C  LEU*     4.3    22.5    -      -       +      +
----------------------------------------------------------
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Residues in contact with ILE 149 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    126C  ILE*     3.7    13.0    -      -       +      -
    130C  HIS*     3.4    55.0    -      -       +      +
    133C  LEU*     4.1    14.1    -      -       +      -
    134C  LEU*     4.2    12.6    -      -       +      -
    145C  MET*     3.0    37.7    +      -       +      +
    146C  LEU*     4.0     5.4    -      -       +      +
    148C  LYS*     1.3    71.6    -      -       -      +
    150C  ASN*     1.3    67.5    +      -       -      +
    152C  ALA*     3.1     5.8    +      -       -      +
    153C  GLU*     2.9    22.4    +      -       +      +
    209C  ILE*     4.7     3.8    -      -       +      -
    212C  LEU*     3.9    23.1    -      -       +      -
----------------------------------------------------------
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Residues in contact with ASN 150 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     67C  ALA      3.0    27.1    +      -       -      -
     68C  ASN*     3.4    16.0    +      -       -      +
    104C  ILE*     4.0    18.0    -      -       +      +
    123C  ILE*     3.2    20.0    -      -       +      +
    126C  ILE*     3.6     7.8    -      -       +      +
    146C  LEU*     2.8    22.8    +      -       +      +
    147C  THR*     3.6     6.0    +      -       -      +
    149C  ILE*     1.3    78.1    -      -       -      +
    151C  VAL*     1.3    63.7    +      -       -      +
    153C  GLU*     3.2     6.6    +      -       -      +
    154C  GLN*     2.7    55.6    +      -       -      +
----------------------------------------------------------
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Residues in contact with VAL 151 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     68C  ASN*     4.1     8.5    -      -       -      +
     95C  ILE*     4.3     5.8    -      -       +      +
     96C  CYS      4.6     0.7    -      -       -      -
     97C  GLY*     3.6    22.4    -      -       -      +
    147C  THR      3.1    18.6    +      -       -      +
    148C  LYS      3.1     8.5    +      -       -      +
    150C  ASN*     1.3    75.0    -      -       -      +
    152C  ALA*     1.3    63.9    +      -       -      +
    154C  GLN*     3.2     8.0    +      -       -      +
    155C  VAL*     3.1    26.6    +      -       +      +
    178C  GLY*     3.5    40.2    -      -       -      +
    179C  TRP      3.5    17.0    -      -       -      +
    180C  VAL*     3.8     5.6    -      -       +      -
    191C  GLN*     3.9    12.3    -      -       +      -
----------------------------------------------------------
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Residues in contact with ALA 152 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    148C  LYS      3.2     7.7    +      -       -      +
    149C  ILE*     3.1    10.8    +      -       -      +
    151C  VAL*     1.3    80.9    -      -       -      +
    153C  GLU*     1.3    61.9    +      -       -      +
    155C  VAL*     3.4     5.2    +      -       -      +
    156C  TYR*     3.1    21.3    +      -       -      +
    191C  GLN*     5.0     5.4    -      -       +      +
    193C  VAL*     3.8    26.6    -      -       +      +
    205C  TYR*     4.0     6.7    -      -       +      -
    208C  ALA*     4.8     4.7    -      -       +      -
    209C  ILE*     4.1    22.4    -      -       +      -
    212C  LEU*     4.8     4.5    -      -       +      -
----------------------------------------------------------
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Residues in contact with GLU 153 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    126C  ILE*     3.7    40.4    -      -       +      +
    129C  LYS*     3.1    24.2    +      -       -      +
    130C  HIS*     2.5    31.2    +      -       -      +
    149C  ILE*     2.9    20.6    +      -       +      +
    150C  ASN      3.7     1.1    -      -       -      +
    152C  ALA*     1.3    76.3    -      -       +      +
    154C  GLN*     1.3    58.5    +      -       -      +
    156C  TYR*     3.3    11.8    -      -       -      +
    157C  ASN*     2.9    35.1    +      -       -      +
    205C  TYR*     2.7    27.0    +      -       +      -
    209C  ILE*     4.3     0.6    -      -       +      +
----------------------------------------------------------
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Residues in contact with GLN 154 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     68C  ASN*     3.4    21.5    -      -       -      +
     69C  GLN*     3.5    18.9    +      -       -      +
     70C  VAL*     2.9    27.8    +      -       -      +
     71C  ILE*     5.5     0.3    -      -       -      +
     95C  ILE*     3.3    26.1    -      -       +      +
    126C  ILE*     3.3    21.4    -      -       -      +
    150C  ASN*     2.7    46.6    +      -       -      +
    151C  VAL*     3.2     4.5    +      -       -      +
    153C  GLU*     1.3    73.4    -      -       -      +
    155C  VAL*     1.3    61.4    +      -       -      +
    157C  ASN*     3.3    19.2    +      -       -      +
    158C  LEU*     3.0    22.9    +      -       -      +
----------------------------------------------------------
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Residues in contact with VAL 155 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     95C  ILE*     3.7    12.1    -      -       +      -
    151C  VAL*     3.1    17.8    +      -       +      +
    152C  ALA*     3.7     7.2    -      -       -      +
    154C  GLN*     1.3    74.8    -      -       -      +
    156C  TYR*     1.3    58.7    +      -       -      +
    158C  LEU*     3.2     5.0    +      -       +      +
    159C  GLY      2.9    24.4    +      -       -      -
    176C  LEU*     3.9    28.8    -      -       +      +
    177C  HIS      3.7     6.3    -      -       -      +
    178C  GLY*     3.6    29.4    -      -       -      -
    193C  VAL*     3.6    33.9    -      -       +      +
    195C  ALA*     5.3     0.7    -      -       +      -
    201C  LEU*     3.7     5.7    -      -       +      +
----------------------------------------------------------
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Residues in contact with TYR 156 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    129C  LYS*     4.9     6.1    -      -       -      -
    152C  ALA      3.1    13.4    +      -       -      +
    153C  GLU*     3.3    15.5    -      -       -      +
    155C  VAL*     1.3    76.7    -      -       -      +
    157C  ASN*     1.3    62.6    +      -       -      +
    159C  GLY*     3.2     2.8    +      -       -      -
    160C  ARG*     3.0    64.5    +      -       -      +
    193C  VAL*     4.8     0.8    -      -       -      +
    198C  ARG*     3.9    12.8    +      -       -      -
    201C  LEU*     3.9    19.5    -      -       +      +
    202C  GLU*     2.3    40.2    +      -       -      -
    205C  TYR*     3.7    55.1    -      +       +      -
    231C  SO4      5.0     2.3    +      -       -      -
----------------------------------------------------------
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Residues in contact with ASN 157 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     70C  VAL*     3.2    30.1    +      -       +      +
     71C  ILE*     5.1     1.4    -      -       -      +
     72C  HIS*     3.1    33.8    +      -       +      +
    126C  ILE*     5.4     2.6    -      -       -      +
    153C  GLU*     2.9    22.2    +      -       -      +
    154C  GLN*     3.3    24.4    +      -       -      +
    155C  VAL      3.3     0.2    -      -       -      -
    156C  TYR*     1.3    76.4    -      -       -      +
    158C  LEU*     1.3    62.3    +      -       -      +
    160C  ARG*     3.2    25.9    +      -       -      +
    161C  THR*     3.2    15.9    +      -       -      +
    121D  LEU*     4.9     0.2    -      -       -      +
    125D  ASP*     5.2     0.2    -      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 158 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     40C  ILE*     4.7     1.1    -      -       +      -
     70C  VAL*     4.1    17.2    -      -       +      +
     81C  VAL*     3.9    39.5    -      -       +      -
     93C  ILE*     3.4    32.5    -      -       +      +
     95C  ILE*     4.0    20.6    -      -       +      -
    154C  GLN      3.0    16.9    +      -       -      +
    155C  VAL*     3.4     5.8    -      -       +      +
    156C  TYR      3.2     0.2    -      -       -      -
    157C  ASN*     1.3    76.4    -      -       -      +
    159C  GLY*     1.3    60.5    +      -       -      +
    161C  THR*     2.8    27.5    +      -       +      +
    164C  VAL*     3.3    13.2    -      -       +      +
    176C  LEU*     3.9    25.8    -      -       +      -
    177C  HIS      5.6     0.4    -      -       -      +
----------------------------------------------------------
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Residues in contact with GLY 159 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    155C  VAL      2.9    10.7    +      -       -      -
    158C  LEU*     1.3    75.8    -      -       -      +
    160C  ARG*     1.3    55.9    +      -       -      +
    161C  THR      3.5     0.2    -      -       -      -
    164C  VAL*     4.1     2.8    -      -       -      +
    165C  LYS*     3.4    20.1    -      -       -      +
    168C  TRP*     3.6    15.5    -      -       -      -
    176C  LEU*     3.5    19.4    -      -       -      +
    198C  ARG*     3.8     2.3    -      -       -      -
    201C  LEU*     3.5    26.2    -      -       -      +
----------------------------------------------------------
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Residues in contact with ARG 160 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     72C  HIS*     3.7     4.9    -      -       -      -
    129C  LYS*     6.0     1.0    -      -       -      +
    156C  TYR*     3.0    52.9    +      -       -      +
    157C  ASN*     3.2    26.6    +      -       -      +
    158C  LEU      3.1     0.4    -      -       -      -
    159C  GLY*     1.3    78.7    -      -       -      +
    161C  THR*     1.3    66.9    +      -       -      +
    162C  SER      3.6     0.5    +      -       -      -
    165C  LYS*     3.6    17.5    -      -       -      +
    198C  ARG*     3.8    11.9    -      -       -      +
    201C  LEU*     4.2     1.6    -      -       +      -
    231C  SO4      2.7    42.9    +      -       -      +
    112D  ASP*     5.2     0.2    -      -       -      +
    117D  ASN*     6.0     1.6    -      -       -      +
    121D  LEU*     3.6    39.2    +      -       +      +
    124D  ARG*     4.3     4.9    -      -       -      +
    125D  ASP*     2.9    30.7    +      -       -      +
----------------------------------------------------------
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Residues in contact with THR 161 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     70C  VAL*     4.5    11.0    -      -       +      -
     72C  HIS*     5.5     6.3    -      -       -      +
     78C  LEU*     3.5    29.6    -      -       +      +
     81C  VAL*     4.7     0.3    -      -       -      +
    157C  ASN      3.2    14.2    +      -       -      +
    158C  LEU*     2.8    26.4    +      -       +      +
    160C  ARG*     1.3    81.0    -      -       -      +
    162C  SER*     1.3    64.8    +      -       -      +
    163C  ILE*     3.9     4.2    -      -       -      +
    164C  VAL*     3.2    19.4    +      -       -      +
    165C  LYS*     3.2    20.4    +      -       -      +
    118D  ASN*     3.3    11.4    -      -       -      +
    121D  LEU*     4.5     3.1    -      -       +      -
----------------------------------------------------------
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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