Contacts of the helix formed by residues 134 - 157 (chain T) 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 T).
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    103T  PHE*     3.8     1.6    -      -       -      -
    132T  LEU*     3.3     3.1    -      -       -      +
    133T  LYS*     1.3    78.7    -      -       -      +
    135T  LYS*     1.3    63.8    +      -       -      +
    136T  ALA      3.7     0.2    +      -       -      -
    137T  LEU*     3.1    39.2    +      -       -      +
    138T  SER*     2.8    30.7    +      -       -      -
    130U  GLU*     2.8    27.3    +      -       -      -
----------------------------------------------------------
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Residues in contact with LYS 135 (chain T). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     96T  VAL*     4.3    14.8    -      -       +      -
    103T  PHE*     3.5    48.2    -      -       +      -
    105T  VAL*     5.4     0.4    -      -       -      +
    134T  SER*     1.3    72.0    +      -       -      +
    136T  ALA*     1.3    59.7    +      -       -      +
    138T  SER*     3.0     4.9    +      -       -      -
    139T  LEU*     2.8    38.6    +      -       +      +
     95U  PHE*     3.6    37.9    -      -       +      +
     97U  ASP*     2.8    36.1    +      -       -      +
    130U  GLU*     4.9     1.0    +      -       -      -
----------------------------------------------------------
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Residues in contact with ALA 136 (chain T). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    134T  SER*     3.3     0.8    +      -       -      +
    135T  LYS*     1.3    79.7    -      -       -      +
    137T  LEU*     1.3    58.3    +      -       -      +
    139T  LEU      3.3     0.2    +      -       -      -
    140T  GLU*     2.9    30.9    +      -       -      +
     95U  PHE*     3.3    25.3    -      -       +      -
    105U  VAL      4.3     3.8    -      -       -      +
    106U  GLY*     4.5     2.0    -      -       -      -
    126U  TYR*     3.6     8.4    -      -       -      -
    128U  VAL*     3.5    37.0    -      -       +      -
    130U  GLU*     3.9    12.5    +      -       +      +
----------------------------------------------------------
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Residues in contact with LEU 137 (chain T). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    132T  LEU*     4.1    16.7    -      -       +      +
    134T  SER*     3.1    35.0    +      -       -      +
    136T  ALA*     1.3    84.0    -      -       +      +
    138T  SER*     1.3    61.8    +      -       -      +
    140T  GLU*     3.6    22.7    -      -       -      +
    141T  LYS*     3.2    24.3    +      -       -      +
    128U  VAL*     4.6     8.7    -      -       +      -
    130U  GLU*     3.8    15.7    -      -       -      +
----------------------------------------------------------
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Residues in contact with SER 138 (chain T). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    103T  PHE*     3.7    16.1    +      -       -      +
    105T  VAL*     3.8    21.5    -      -       -      -
    129T  SER*     3.4    25.9    +      -       -      -
    132T  LEU*     3.4    19.3    -      -       -      +
    134T  SER      2.8    23.7    +      -       -      -
    135T  LYS      3.3     4.5    -      -       -      -
    137T  LEU*     1.3    75.8    -      -       -      +
    139T  LEU*     1.3    65.8    +      -       -      +
    141T  LYS      3.4     0.7    +      -       -      -
    142T  ALA*     3.1    21.3    +      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 139 (chain T). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     93T  VAL*     4.4    17.7    -      -       +      -
     96T  VAL*     4.0    21.3    -      -       +      -
    105T  VAL*     3.6    26.2    -      -       +      -
    107T  VAL*     4.7     2.0    -      -       +      -
    135T  LYS*     2.8    30.7    +      -       +      +
    136T  ALA      3.7     0.7    -      -       -      +
    138T  SER*     1.3    69.5    -      -       -      +
    140T  GLU*     1.3    67.4    +      -       -      +
    142T  ALA      3.2     1.2    +      -       -      -
    143T  ARG*     2.8    32.0    +      -       +      +
     94U  ASP*     3.4    21.1    -      -       +      +
     95U  PHE*     3.9    26.5    -      -       +      -
    126U  TYR*     3.4    16.4    -      -       +      +
----------------------------------------------------------
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Residues in contact with GLU 140 (chain T). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    136T  ALA      2.9    17.0    +      -       -      +
    137T  LEU*     3.6    27.2    -      -       -      +
    139T  LEU*     1.3    77.8    -      -       -      +
    141T  LYS*     1.3    64.8    +      -       -      +
    143T  ARG*     4.2     0.3    -      -       -      +
    144T  LYS*     3.0    56.1    +      -       +      +
    126U  TYR*     3.5    41.6    -      -       +      +
    128U  VAL*     4.8     7.0    -      -       +      +
    149U  ASP*     4.4     0.7    -      -       -      +
----------------------------------------------------------
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Residues in contact with LYS 141 (chain T). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    128T  VAL      2.6    28.4    +      -       -      +
    129T  SER*     3.8    14.5    -      -       -      +
    132T  LEU*     5.1     7.4    -      -       +      -
    137T  LEU      3.2    16.4    +      -       -      +
    138T  SER      3.7     3.6    -      -       -      +
    140T  GLU*     1.3    81.3    -      -       -      +
    142T  ALA*     1.3    65.0    +      -       -      +
    144T  LYS*     4.0     2.5    -      -       -      +
    145T  GLU*     3.0    60.4    +      -       +      +
----------------------------------------------------------
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Residues in contact with ALA 142 (chain T). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    105T  VAL*     3.9    15.5    -      -       +      +
    107T  VAL*     3.7    17.5    -      -       +      +
    127T  GLY*     3.2    35.0    -      -       -      +
    128T  VAL*     4.0     7.9    -      -       -      +
    129T  SER      4.3     0.2    -      -       -      +
    138T  SER      3.1    15.5    +      -       -      +
    139T  LEU      3.9     0.4    -      -       -      +
    141T  LYS*     1.3    82.7    -      -       -      +
    143T  ARG*     1.3    62.2    +      -       -      +
    146T  ALA*     3.1    22.5    +      -       -      +
----------------------------------------------------------
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Residues in contact with ARG 143 (chain T). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     91T  GLN*     2.9    59.5    +      -       -      +
     93T  VAL*     3.6    25.9    -      -       -      +
    107T  VAL*     4.1    13.5    -      -       +      -
    139T  LEU*     2.8    26.5    +      -       +      +
    140T  GLU*     4.2     2.7    -      -       -      +
    142T  ALA*     1.3    72.3    -      -       -      +
    144T  LYS*     1.3    64.5    +      -       +      +
    146T  ALA      3.4     0.9    +      -       -      -
    147T  VAL*     3.3    12.1    +      -       -      +
     92U  ASN*     4.9     4.6    +      -       -      +
     94U  ASP*     2.6    45.5    +      -       -      -
    108U  CYS*     3.3    26.3    -      -       -      -
    110U  PHE*     4.5     5.9    -      -       -      -
    124U  VAL*     4.1     9.0    -      -       +      -
    126U  TYR*     3.8    23.3    -      -       +      -
----------------------------------------------------------
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Residues in contact with LYS 144 (chain T). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    140T  GLU*     3.0    49.0    +      -       +      +
    141T  LYS*     4.1     2.5    -      -       -      +
    143T  ARG*     1.3    77.8    -      -       +      +
    145T  GLU*     1.3    63.3    +      -       +      +
    147T  VAL*     3.3     5.4    +      -       -      +
    148T  THR*     3.1    23.8    +      -       -      -
    124U  VAL*     4.1    14.4    -      -       +      +
    126U  TYR*     4.0    11.4    -      -       +      +
    149U  ASP*     2.6    36.2    +      -       -      -
    153U  ARG*     3.4    40.4    +      -       -      +
----------------------------------------------------------
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Residues in contact with GLU 145 (chain T). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    126T  TYR      4.1     3.1    -      -       -      +
    127T  GLY*     4.1     9.1    -      -       -      -
    128T  VAL*     3.8    10.2    +      -       -      +
    141T  LYS*     3.0    61.6    +      -       +      +
    144T  LYS*     1.3    74.0    -      -       +      +
    146T  ALA*     1.3    60.8    +      -       -      +
    148T  THR*     4.0     5.6    -      -       -      +
    149T  ASP*     2.8    34.2    +      -       +      +
----------------------------------------------------------
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Residues in contact with ALA 146 (chain T). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     91T  GLN*     3.8    11.9    -      -       -      +
    107T  VAL*     3.5    25.1    -      -       +      +
    109T  ALA*     3.7    16.1    -      -       +      +
    125T  GLY*     3.4     8.9    -      -       -      +
    126T  TYR      3.6    13.0    -      -       -      +
    127T  GLY*     3.5     1.5    -      -       -      +
    142T  ALA      3.1    19.4    +      -       -      +
    143T  ARG      3.7     4.9    -      -       -      +
    144T  LYS      3.3     0.4    -      -       -      -
    145T  GLU*     1.3    76.6    -      -       -      +
    147T  VAL*     1.3    57.5    +      -       -      +
    150T  GLY*     2.9    24.8    +      -       -      -
----------------------------------------------------------
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Residues in contact with VAL 147 (chain T). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     86T  HIS*     5.2     6.1    -      -       +      +
     88T  ILE*     3.8    30.3    -      -       +      -
     91T  GLN*     3.6    16.4    -      -       -      +
    109T  ALA*     3.9    11.0    -      -       +      -
    111T  VAL*     3.6     6.7    -      -       +      +
    143T  ARG      3.3     0.6    +      -       -      +
    144T  LYS      3.3     7.5    +      -       -      +
    145T  GLU      3.2     0.4    -      -       -      -
    146T  ALA*     1.3    78.2    -      -       -      +
    148T  THR*     1.3    59.9    +      -       -      +
    150T  GLY*     3.0     3.1    +      -       -      -
    151T  LEU*     2.8    28.8    +      -       +      +
    110U  PHE*     5.1     0.2    -      -       +      -
    122U  GLU      4.6     3.1    -      -       -      +
    123U  ASP*     3.5    25.8    -      -       -      +
    124U  VAL*     3.3    26.7    -      -       +      -
----------------------------------------------------------
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Residues in contact with THR 148 (chain T). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     68T  GLY*     4.0    27.4    -      -       -      +
     72T  ILE*     6.5     0.9    -      -       +      -
    144T  LYS      3.1    14.3    +      -       -      -
    145T  GLU*     4.0     5.8    -      -       -      -
    147T  VAL*     1.3    79.5    -      -       -      +
    149T  ASP*     1.3    62.7    +      -       -      +
    151T  LEU*     3.3    11.5    +      -       +      +
    152T  LYS*     2.9    32.2    +      -       +      +
    123U  ASP*     5.2     2.1    +      -       -      -
    153U  ARG*     3.7    17.5    +      -       -      -
----------------------------------------------------------
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Residues in contact with ASP 149 (chain T). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    140S  GLU*     5.2     0.4    -      -       -      -
    144S  LYS*     2.8    28.3    +      -       -      -
    125T  GLY*     3.4     2.2    -      -       -      -
    126T  TYR      2.8    32.1    +      -       -      +
    145T  GLU*     2.8    24.2    +      -       +      +
    146T  ALA      3.7     2.5    -      -       -      +
    148T  THR*     1.3    73.9    -      -       -      +
    150T  GLY*     1.3    57.3    +      -       -      +
    152T  LYS*     3.3    19.9    +      -       -      +
    153T  ARG*     2.9    37.9    +      -       -      +
    156T  ARG*     5.2     4.2    +      -       -      -
----------------------------------------------------------
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Residues in contact with GLY 150 (chain T). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    111T  VAL*     3.7    15.6    -      -       -      +
    123T  ASP*     4.4     2.9    -      -       -      +
    124T  VAL      4.0     5.2    -      -       -      -
    125T  GLY*     3.3    22.4    -      -       -      -
    146T  ALA      2.9    12.3    +      -       -      -
    147T  VAL      3.5     2.7    -      -       -      -
    149T  ASP*     1.3    75.8    -      -       -      +
    151T  LEU*     1.3    64.6    +      -       -      +
    153T  ARG*     3.8     0.9    -      -       -      +
    154T  ALA*     2.9    25.6    +      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 151 (chain T). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     71T  VAL*     5.5     1.3    -      -       +      -
     72T  ILE*     4.4    26.0    -      -       +      -
     84T  TRP*     3.9    11.0    -      -       +      -
     86T  HIS*     3.8    48.5    -      -       +      +
    111T  VAL*     3.8    13.1    -      -       +      +
    113T  VAL*     4.7     5.4    -      -       +      -
    147T  VAL*     2.8    17.6    +      -       +      +
    148T  THR*     3.7    11.2    -      -       +      +
    150T  GLY*     1.3    75.7    -      -       -      +
    152T  LYS*     1.3    67.7    +      -       +      +
    154T  ALA*     3.3     1.1    +      -       -      +
    155T  LEU*     3.0    53.3    +      -       +      +
    123U  ASP*     6.2     0.2    -      -       -      +
    157U  SER*     5.3     0.4    -      -       -      +
----------------------------------------------------------
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Residues in contact with LYS 152 (chain T). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     65T  TYR*     4.2    16.6    -      -       -      +
     66T  ILE*     2.8    33.9    +      -       +      +
     67T  GLU*     4.9     0.2    -      -       -      +
     68T  GLY*     4.1    14.4    -      -       -      +
     71T  VAL*     3.9    31.2    -      -       +      -
    148T  THR*     2.9    27.9    +      -       +      +
    149T  ASP*     3.7    19.6    +      -       -      +
    151T  LEU*     1.3    81.0    -      -       +      +
    153T  ARG*     1.3    63.7    +      -       -      +
    155T  LEU*     3.3     6.2    +      -       -      +
    156T  ARG*     3.1    44.2    +      -       -      +
    162T  LEU      4.8     1.6    -      -       -      +
----------------------------------------------------------
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Residues in contact with ARG 153 (chain T). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    144S  LYS*     3.5    56.9    +      -       -      +
    147S  VAL*     4.8     0.2    -      -       -      +
    148S  THR*     3.7    17.8    +      -       -      -
    123T  ASP*     2.6    60.2    +      -       +      +
    124T  VAL*     2.8    26.7    +      -       -      +
    149T  ASP*     2.9    24.4    +      -       -      +
    150T  GLY      3.9     1.3    -      -       -      +
    151T  LEU      3.3     0.2    -      -       -      -
    152T  LYS*     1.3    77.3    -      -       -      +
    154T  ALA*     1.3    63.3    +      -       -      +
    156T  ARG*     3.2    45.4    +      -       -      +
    157T  SER*     3.9     4.7    +      -       -      -
----------------------------------------------------------
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Residues in contact with ALA 154 (chain T). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     86S  HIS*     6.1     0.2    -      -       -      -
    111T  VAL*     3.7    20.6    -      -       +      +
    113T  VAL*     3.4    26.0    -      -       +      +
    121T  HIS*     3.7    12.1    -      -       -      +
    122T  GLU      4.9     0.7    -      -       -      -
    123T  ASP*     3.8    12.9    -      -       -      +
    150T  GLY      2.9    18.1    +      -       -      +
    151T  LEU*     3.8     4.7    -      -       -      +
    153T  ARG*     1.3    76.2    -      -       -      +
    155T  LEU*     1.3    63.6    +      -       -      +
    157T  SER*     3.1    25.2    +      -       -      -
    158T  PHE*     4.5     1.2    +      -       -      -
----------------------------------------------------------
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Residues in contact with LEU 155 (chain T). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     71T  VAL*     3.8    20.0    -      -       +      -
     72T  ILE*     6.0     0.2    -      -       -      -
     75T  ALA*     4.7     8.1    -      -       +      -
     79T  PHE*     5.0     4.5    -      -       +      -
     84T  TRP*     4.2    15.7    -      -       +      -
    113T  VAL*     3.5    29.4    -      -       +      -
    151T  LEU*     3.0    45.2    +      -       +      +
    152T  LYS      3.6     4.9    -      -       -      +
    154T  ALA*     1.3    75.7    -      -       -      +
    156T  ARG*     1.3    63.6    +      -       -      +
    158T  PHE*     3.0    30.7    +      -       +      -
    162T  LEU*     3.5    38.7    -      -       +      +
----------------------------------------------------------
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Residues in contact with ARG 156 (chain T). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     72S  ILE*     5.3     3.6    -      -       +      -
     65T  TYR*     6.2     2.2    -      -       -      +
     66T  ILE*     5.0     8.9    -      -       -      +
     71T  VAL*     6.1     1.0    -      -       -      +
    149T  ASP*     5.2     4.6    +      -       -      -
    152T  LYS*     3.1    37.7    +      -       -      +
    153T  ARG*     3.2    37.0    +      -       -      +
    155T  LEU*     1.3    76.4    -      -       -      +
    157T  SER*     1.3    63.3    +      -       -      +
    158T  PHE      3.0     1.6    +      -       -      -
    159T  GLY      3.1    11.8    +      -       -      +
    162T  LEU      3.9     9.9    +      -       -      +
    163T  GLY*     3.7    25.0    +      -       -      +
    164T  ASN*     3.4    31.5    -      -       -      +
    166T  ILE*     3.9    24.5    -      -       -      +
    167T  LEU*     4.2    15.5    -      -       -      +
----------------------------------------------------------
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Residues in contact with SER 157 (chain T). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     72S  ILE*     3.5    23.0    -      -       -      +
     76S  ASN*     3.0    23.4    +      -       -      +
     84S  TRP*     3.8     9.7    -      -       -      -
     86S  HIS*     3.5    17.8    -      -       -      -
    151S  LEU*     5.1     0.5    -      -       -      +
    121T  HIS*     3.4    29.6    -      -       -      -
    123T  ASP*     5.2     2.8    +      -       -      -
    153T  ARG      4.0     4.9    +      -       -      -
    154T  ALA*     3.2    15.3    +      -       -      -
    155T  LEU      3.0     0.6    -      -       -      -
    156T  ARG*     1.3    78.9    -      -       -      +
    158T  PHE*     1.3    57.4    +      -       -      +
    159T  GLY      3.3     0.4    -      -       -      -
----------------------------------------------------------
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A short description of the analytical approach
The contact analysis used in this page is based upon the approach developed in: Sobolev V., Wade R.C., Vriend G. and Edelman M. PROTEINS (1996) 25, 120-129. Contact legitimacy depends on the hydrophobic-hydrophilic properties of the contacting atoms. In order to define it, for each inter-atomic contact, eight atom classes have been introduced:


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

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

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