Contacts of the helix formed by residues 134 - 157 (chain N) in PDB entry 1H2I


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 134 (chain N).
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    103N  PHE*     3.8     1.6    -      -       -      -
    132N  LEU*     3.4     2.5    -      -       -      +
    133N  LYS*     1.3    79.1    -      -       -      +
    135N  LYS*     1.3    62.7    +      -       -      +
    137N  LEU*     3.1    37.5    +      -       -      +
    138N  SER*     3.0    25.5    +      -       -      -
    130O  GLU*     2.8    27.1    +      -       -      -
----------------------------------------------------------
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Residues in contact with LYS 135 (chain N). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     96N  VAL*     4.3    15.5    -      -       +      -
    103N  PHE*     3.5    49.0    -      -       +      -
    134N  SER*     1.3    71.8    +      -       -      +
    136N  ALA*     1.3    58.8    +      -       -      +
    138N  SER*     3.0     5.0    +      -       -      -
    139N  LEU*     2.8    38.7    +      -       +      +
     95O  PHE*     3.7    37.8    -      -       +      +
     97O  ASP*     2.7    36.0    +      -       -      +
    130O  GLU*     4.8     1.4    +      -       -      -
----------------------------------------------------------
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Residues in contact with ALA 136 (chain N). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    134N  SER*     3.3     0.6    -      -       -      +
    135N  LYS*     1.3    80.3    -      -       -      +
    137N  LEU*     1.3    56.3    +      -       -      +
    139N  LEU      3.4     0.2    +      -       -      -
    140N  GLU*     2.9    31.2    +      -       -      +
     95O  PHE*     3.4    24.6    -      -       +      -
    105O  VAL      4.4     3.6    -      -       -      +
    106O  GLY*     4.5     2.0    -      -       -      -
    126O  TYR*     3.7     7.1    -      -       -      -
    128O  VAL*     3.5    35.7    -      -       +      -
    130O  GLU*     3.8    13.4    +      -       +      +
----------------------------------------------------------
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Residues in contact with LEU 137 (chain N). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    132N  LEU*     4.1    16.6    -      -       +      +
    134N  SER*     3.1    30.1    +      -       -      +
    136N  ALA*     1.3    80.1    -      -       +      +
    138N  SER*     1.3    56.4    +      -       -      +
    140N  GLU*     3.6    22.6    -      -       -      +
    141N  LYS*     3.0    29.6    +      -       -      +
    128O  VAL*     4.7     9.0    -      -       +      -
    130O  GLU*     3.8    15.0    -      -       -      +
----------------------------------------------------------
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Residues in contact with SER 138 (chain N). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    103N  PHE*     3.7    17.5    +      -       -      +
    105N  VAL*     3.8    20.6    -      -       -      -
    129N  SER*     3.4    29.9    +      -       -      -
    132N  LEU*     3.5    15.1    -      -       -      +
    134N  SER      3.0    15.9    +      -       -      -
    135N  LYS      3.0     9.8    +      -       -      -
    137N  LEU*     1.3    74.3    -      -       -      +
    139N  LEU*     1.3    65.7    +      -       -      +
    141N  LYS      3.4     0.9    +      -       -      -
    142N  ALA*     3.0    22.0    +      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 139 (chain N). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     93N  VAL*     4.4    18.2    -      -       +      -
     96N  VAL*     4.0    22.2    -      -       +      -
    105N  VAL*     3.6    26.2    -      -       +      -
    107N  VAL*     4.7     2.5    -      -       +      -
    135N  LYS*     2.8    29.8    +      -       +      +
    136N  ALA      3.8     0.7    -      -       -      +
    138N  SER*     1.3    73.1    -      -       -      +
    140N  GLU*     1.3    65.2    +      -       -      +
    142N  ALA*     3.3     0.7    +      -       -      -
    143N  ARG*     2.9    32.6    +      -       +      +
     94O  ASP*     3.5    21.1    -      -       +      +
     95O  PHE*     4.0    25.4    -      -       +      -
    126O  TYR*     3.4    15.0    -      -       +      +
----------------------------------------------------------
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Residues in contact with GLU 140 (chain N). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    136N  ALA      2.9    17.8    +      -       -      +
    137N  LEU*     3.6    27.2    -      -       -      +
    139N  LEU*     1.3    76.8    -      -       -      +
    141N  LYS*     1.3    64.0    +      -       -      +
    143N  ARG*     5.0     0.2    -      -       -      -
    144N  LYS*     3.0    62.6    +      -       +      +
    126O  TYR*     3.5    35.6    -      -       +      +
    128O  VAL*     4.7     7.5    -      -       -      +
    149O  ASP*     4.5     0.7    -      -       -      +
----------------------------------------------------------
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Residues in contact with LYS 141 (chain N). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    128N  VAL      2.7    27.3    +      -       -      +
    129N  SER*     4.0    14.3    -      -       -      +
    132N  LEU*     5.1     8.5    -      -       +      -
    137N  LEU      3.0    17.4    +      -       -      +
    138N  SER      3.8     3.8    -      -       -      +
    140N  GLU*     1.3    80.9    -      -       -      +
    142N  ALA*     1.3    58.6    +      -       -      +
    144N  LYS*     4.0     2.4    -      -       -      +
    145N  GLU*     2.8    66.3    +      -       +      +
----------------------------------------------------------
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Residues in contact with ALA 142 (chain N). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    105N  VAL*     3.9    16.2    -      -       +      +
    107N  VAL*     3.7    17.7    -      -       +      +
    127N  GLY*     3.3    30.2    -      -       -      +
    128N  VAL      4.1     6.3    -      -       -      +
    129N  SER*     4.6     0.2    -      -       -      -
    138N  SER      3.0    16.6    +      -       -      +
    139N  LEU      4.0     0.9    -      -       -      +
    141N  LYS*     1.3    76.9    -      -       -      +
    143N  ARG*     1.3    65.2    +      -       -      +
    146N  ALA*     3.1    24.9    +      -       -      +
----------------------------------------------------------
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Residues in contact with ARG 143 (chain N). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     91N  GLN*     2.9    61.0    +      -       -      +
     93N  VAL*     3.6    26.6    -      -       -      +
    107N  VAL*     4.0    13.2    -      -       +      -
    139N  LEU*     2.9    22.2    +      -       +      +
    140N  GLU*     4.3     2.5    -      -       -      +
    142N  ALA*     1.3    75.6    -      -       -      +
    144N  LYS*     1.3    66.1    +      -       +      +
    147N  VAL*     3.2    13.3    +      -       -      +
     92O  ASN*     5.3     4.4    +      -       -      +
     94O  ASP*     2.5    46.5    +      -       -      -
    108O  CYS*     3.4    25.3    -      -       -      -
    110O  PHE*     4.6     4.9    -      -       -      -
    124O  VAL*     4.3     9.4    -      -       +      -
    126O  TYR*     3.8    22.9    -      -       +      -
----------------------------------------------------------
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Residues in contact with LYS 144 (chain N). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    140N  GLU*     3.0    47.8    +      -       +      +
    141N  LYS*     4.1     3.4    -      -       -      +
    143N  ARG*     1.3    80.3    -      -       +      +
    145N  GLU*     1.3    62.4    +      -       +      +
    147N  VAL*     3.3     3.3    +      -       -      +
    148N  THR*     3.1    25.2    +      -       -      -
    124O  VAL*     4.2    13.0    -      -       +      +
    125O  GLY      4.5     0.7    -      -       -      -
    126O  TYR*     4.0    13.0    -      -       +      +
    149O  ASP*     2.7    34.5    +      -       -      -
    153O  ARG*     3.6    40.4    +      -       -      +
----------------------------------------------------------
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Residues in contact with GLU 145 (chain N). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    126N  TYR      3.9     3.6    -      -       -      +
    127N  GLY*     4.0     9.1    -      -       -      -
    128N  VAL*     3.7    10.7    +      -       -      +
    141N  LYS*     2.8    64.4    +      -       +      +
    144N  LYS*     1.3    73.7    -      -       +      +
    146N  ALA*     1.3    58.2    +      -       -      +
    148N  THR*     4.0     5.3    -      -       -      +
    149N  ASP*     2.7    38.8    +      -       +      +
----------------------------------------------------------
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Residues in contact with ALA 146 (chain N). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     91N  GLN*     3.8     4.5    -      -       -      +
    107N  VAL*     3.5    33.2    -      -       +      +
    109N  ALA*     3.7    15.6    -      -       +      +
    125N  GLY*     3.5     7.6    -      -       -      -
    126N  TYR      3.5    13.5    -      -       -      +
    127N  GLY*     3.6     1.4    -      -       -      +
    142N  ALA      3.1    19.1    +      -       -      +
    143N  ARG      3.6     4.7    -      -       -      +
    145N  GLU*     1.3    77.6    -      -       -      +
    147N  VAL*     1.3    62.8    +      -       -      +
    150N  GLY*     2.9    20.4    +      -       -      -
----------------------------------------------------------
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Residues in contact with VAL 147 (chain N). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     86N  HIS*     5.2     6.5    -      -       +      +
     88N  ILE*     3.9    29.2    -      -       +      -
     91N  GLN*     3.6    17.3    -      -       -      +
    109N  ALA*     3.9    11.9    -      -       +      -
    111N  VAL*     3.6     6.5    -      -       +      +
    143N  ARG      3.2     1.8    +      -       -      +
    144N  LYS      3.6     7.0    -      -       -      +
    145N  GLU      3.2     0.6    -      -       -      -
    146N  ALA*     1.3    76.3    -      -       -      +
    148N  THR*     1.3    58.1    +      -       -      +
    150N  GLY*     3.1     2.9    +      -       -      -
    151N  LEU*     2.8    28.1    +      -       +      +
    110O  PHE*     5.0     0.7    -      -       +      -
    122O  GLU      4.9     2.5    -      -       -      +
    123O  ASP*     3.7    22.9    -      -       -      +
    124O  VAL*     3.2    29.2    -      -       +      -
----------------------------------------------------------
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Residues in contact with THR 148 (chain N). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     68N  GLY*     4.0    27.6    -      -       -      +
     72N  ILE*     6.4     1.3    -      -       +      -
    144N  LYS      3.1    14.2    +      -       -      -
    145N  GLU*     4.0     5.4    -      -       -      -
    147N  VAL*     1.3    78.7    -      -       -      +
    149N  ASP*     1.3    63.7    +      -       -      +
    151N  LEU*     3.2    11.9    +      -       +      +
    152N  LYS*     2.9    32.9    +      -       +      +
    123O  ASP*     5.2     2.4    +      -       -      -
    153O  ARG*     3.8    17.3    +      -       -      -
----------------------------------------------------------
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Residues in contact with ASP 149 (chain N). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    140M  GLU*     4.5     0.6    -      -       -      +
    144M  LYS*     2.8    31.7    +      -       -      -
    125N  GLY*     3.3     3.0    -      -       -      -
    126N  TYR      2.8    27.0    +      -       -      +
    145N  GLU*     2.7    23.7    +      -       +      +
    146N  ALA      3.6     3.8    -      -       -      +
    148N  THR*     1.3    73.8    -      -       -      +
    150N  GLY*     1.3    56.9    +      -       -      +
    152N  LYS*     3.2    21.0    +      -       -      +
    153N  ARG*     2.9    37.1    +      -       -      +
    156N  ARG*     5.2     4.3    +      -       -      -
----------------------------------------------------------
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Residues in contact with GLY 150 (chain N). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    111N  VAL*     3.8    15.5    -      -       -      +
    123N  ASP*     4.5     2.8    -      -       -      +
    124N  VAL      4.0     5.6    -      -       -      -
    125N  GLY*     3.3    22.8    -      -       -      -
    146N  ALA      2.9    12.4    +      -       -      -
    147N  VAL      3.5     3.6    -      -       -      -
    149N  ASP*     1.3    75.1    -      -       -      +
    151N  LEU*     1.3    64.9    +      -       -      +
    153N  ARG*     3.2     0.9    +      -       -      +
    154N  ALA*     2.9    26.0    +      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 151 (chain N). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     71N  VAL*     5.6     1.6    -      -       +      -
     72N  ILE*     4.3    26.5    -      -       +      -
     84N  TRP*     3.9    10.1    -      -       +      -
     86N  HIS*     3.8    47.6    -      -       +      +
    111N  VAL*     3.7    14.0    -      -       +      +
    113N  VAL*     4.7     6.1    -      -       +      -
    147N  VAL*     2.8    16.9    +      -       +      +
    148N  THR*     3.7    11.2    -      -       +      +
    150N  GLY*     1.3    76.1    -      -       -      +
    152N  LYS*     1.3    66.3    +      -       +      +
    154N  ALA*     3.3     0.9    +      -       -      +
    155N  LEU*     3.0    48.9    +      -       +      +
    157O  SER*     5.4     0.2    -      -       -      +
----------------------------------------------------------
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Residues in contact with LYS 152 (chain N). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     65N  TYR*     4.3    16.0    -      -       -      +
     66N  ILE*     2.8    33.6    +      -       +      +
     67N  GLU*     5.0     0.2    -      -       -      +
     68N  GLY*     4.0    14.5    -      -       -      +
     71N  VAL*     3.9    31.1    -      -       +      +
    148N  THR*     2.9    27.7    +      -       +      +
    149N  ASP*     3.6    20.1    +      -       -      +
    151N  LEU*     1.3    82.1    -      -       +      +
    153N  ARG*     1.3    62.6    +      -       -      +
    155N  LEU*     3.4     6.0    +      -       -      +
    156N  ARG*     3.1    45.6    +      -       -      +
    162N  LEU      4.7     1.9    -      -       -      +
----------------------------------------------------------
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Residues in contact with ARG 153 (chain N). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    144M  LYS*     3.5    57.8    +      -       -      +
    147M  VAL*     4.8     0.2    -      -       -      +
    148M  THR*     3.8    17.6    +      -       -      -
    123N  ASP*     2.5    59.4    +      -       +      +
    124N  VAL*     2.8    27.8    +      -       -      +
    149N  ASP*     2.9    22.0    +      -       -      +
    150N  GLY      3.2     2.2    +      -       -      +
    152N  LYS*     1.3    75.7    -      -       -      +
    154N  ALA*     1.3    65.7    +      -       -      +
    156N  ARG*     3.2    44.4    +      -       -      +
    157N  SER*     3.8     4.2    +      -       -      -
----------------------------------------------------------
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Residues in contact with ALA 154 (chain N). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    111N  VAL*     3.7    15.5    -      -       +      +
    113N  VAL*     3.4    26.1    -      -       +      +
    121N  HIS*     3.6    16.1    -      -       -      +
    122N  GLU      4.8     1.1    -      -       -      -
    123N  ASP*     3.8    11.8    -      -       -      +
    150N  GLY      2.9    17.8    +      -       -      +
    151N  LEU*     3.7     4.3    -      -       -      +
    153N  ARG*     1.3    76.0    -      -       -      +
    155N  LEU*     1.3    64.2    +      -       -      +
    157N  SER*     3.1    25.6    +      -       -      -
    158N  PHE*     4.4     1.0    +      -       -      -
----------------------------------------------------------
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Residues in contact with LEU 155 (chain N). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     71N  VAL*     3.9    20.4    -      -       +      -
     72N  ILE*     5.8     0.4    -      -       -      +
     75N  ALA*     4.6     7.9    -      -       +      -
     79N  PHE*     5.0     4.7    -      -       +      -
     84N  TRP*     4.2    16.6    -      -       +      -
    113N  VAL*     3.5    29.6    -      -       +      -
    151N  LEU*     3.0    45.6    +      -       +      +
    152N  LYS      3.7     4.5    -      -       -      +
    154N  ALA*     1.3    78.2    -      -       -      +
    156N  ARG*     1.3    62.5    +      -       -      +
    158N  PHE*     3.0    32.3    +      -       +      -
    162N  LEU*     3.6    35.1    -      -       +      +
----------------------------------------------------------
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Residues in contact with ARG 156 (chain N). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     72M  ILE*     5.3     3.1    -      -       +      -
     65N  TYR*     6.2     2.2    -      -       -      +
     66N  ILE*     4.9     9.1    -      -       -      +
     71N  VAL*     6.1     1.2    -      -       -      +
    149N  ASP*     5.2     4.8    +      -       -      -
    152N  LYS*     3.1    42.1    +      -       -      +
    153N  ARG*     3.4    33.4    -      -       -      +
    154N  ALA      3.2     0.8    -      -       -      -
    155N  LEU*     1.3    75.1    -      -       -      +
    157N  SER*     1.3    63.9    +      -       -      +
    159N  GLY      2.9    19.9    +      -       -      +
    162N  LEU      3.9    11.1    +      -       -      +
    163N  GLY*     3.7    23.7    +      -       -      +
    164N  ASN*     3.4    26.2    -      -       -      +
    166N  ILE*     4.0    25.5    -      -       -      +
    167N  LEU*     4.2    15.1    -      -       -      +
----------------------------------------------------------
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Residues in contact with SER 157 (chain N). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     72M  ILE*     3.3    23.7    -      -       -      +
     76M  ASN*     2.9    24.1    +      -       -      +
     84M  TRP*     3.8     8.8    -      -       -      -
     86M  HIS*     3.4    19.3    -      -       -      -
    151M  LEU*     5.2     0.3    -      -       -      +
    121N  HIS*     3.3    29.4    -      -       -      +
    123N  ASP*     5.1     2.6    +      -       -      -
    153N  ARG      4.0     5.0    +      -       -      -
    154N  ALA*     3.1    17.2    +      -       -      -
    155N  LEU      3.0     0.6    +      -       -      -
    156N  ARG*     1.3    78.0    -      -       -      +
    158N  PHE*     1.3    56.0    +      -       -      +
----------------------------------------------------------
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A short description of the analytical approach
The contact analysis used in this page is based upon the approach developed in: Sobolev V., Wade R.C., Vriend G. and Edelman M. PROTEINS (1996) 25, 120-129. Contact legitimacy depends on the hydrophobic-hydrophilic properties of the contacting atoms. In order to define it, for each inter-atomic contact, eight atom classes have been introduced:


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

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

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