Contacts of the helix formed by residues 120 - 148 (chain M) in PDB entry 2FJC


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 ILE 120 (chain M).
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     60M  ILE*     4.1    22.4    -      -       +      -
     61M  TYR      3.4    23.8    +      -       -      +
     62M  GLY*     4.0     2.7    -      -       -      -
     64M  GLU*     3.3    36.6    -      -       +      +
     65M  PHE*     3.5    30.5    -      -       -      +
     68M  VAL*     3.7    21.8    -      -       +      -
    119M  THR*     1.3    71.2    +      -       -      +
    121M  VAL*     1.3    71.8    +      -       +      +
    123M  ALA*     3.3     1.6    +      -       -      +
    124M  LEU*     2.9    35.2    +      -       +      +
----------------------------------------------------------
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Residues in contact with VAL 121 (chain M). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    119M  THR*     3.2    14.8    -      -       +      +
    120M  ILE*     1.3    82.8    -      -       +      +
    122M  SER*     1.3    62.0    +      -       -      +
    124M  LEU*     6.1     0.2    -      -       +      -
    125M  ALA*     3.0    30.8    +      -       -      +
    174M  THR      6.1     0.9    -      -       -      +
    175M  LEU*     3.7    23.8    -      -       +      +
----------------------------------------------------------
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Residues in contact with SER 122 (chain M). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    118M  ILE*     3.9     9.1    -      -       -      +
    119M  THR*     2.9    28.3    -      -       -      +
    121M  VAL*     1.3    81.0    -      -       -      +
    123M  ALA*     1.3    61.5    +      -       -      +
    125M  ALA*     3.5     5.1    +      -       -      +
    126M  ARG*     3.1    54.9    +      -       -      +
    129M  ARG*     5.2     0.2    +      -       -      -
----------------------------------------------------------
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Residues in contact with ALA 123 (chain M). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     56M  TYR*     3.7    26.1    -      -       +      -
     60M  ILE*     3.6    24.9    -      -       +      -
     72M  LEU*     5.5     1.1    -      -       +      -
    118M  ILE*     3.7    10.5    -      -       +      +
    119M  THR      2.9    17.9    +      -       -      +
    120M  ILE      3.7     2.7    -      -       -      +
    122M  SER*     1.3    75.9    -      -       -      +
    124M  LEU*     1.3    66.2    +      -       +      +
    126M  ARG*     3.1     4.6    +      -       -      +
    127M  VAL*     3.0    27.9    +      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 124 (chain M). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     68M  VAL*     3.9    26.9    -      -       +      -
     71M  LEU*     4.4    13.0    -      -       +      -
     72M  LEU*     4.4    13.5    -      -       +      -
    120M  ILE*     2.9    36.8    +      -       +      +
    121M  VAL*     5.1     0.7    -      -       +      -
    123M  ALA*     1.3    77.4    -      -       +      +
    125M  ALA*     1.3    58.9    +      -       -      +
    127M  VAL*     3.3     8.1    +      -       +      +
    128M  LYS*     2.9    30.1    +      -       -      +
    171M  LEU*     3.9    24.3    -      -       +      +
    174M  THR*     3.8    21.5    -      -       +      +
    175M  LEU*     3.8    17.7    -      -       +      +
----------------------------------------------------------
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Residues in contact with ALA 125 (chain M). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    121M  VAL      3.0    19.0    +      -       -      +
    122M  SER*     3.8     7.2    -      -       -      +
    124M  LEU*     1.3    77.0    -      -       -      +
    126M  ARG*     1.3    57.5    +      -       -      +
    128M  LYS*     3.4     3.9    +      -       -      +
    129M  ARG*     3.0    44.0    +      -       -      +
    175M  LEU*     3.5    17.9    -      -       +      +
----------------------------------------------------------
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Residues in contact with ARG 126 (chain M). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     52M  LYS*     5.4     3.6    -      -       -      +
     56M  TYR*     3.3    25.1    -      -       -      +
    113M  GLU*     2.7    40.0    +      -       -      -
    115M  GLU*     3.4    25.2    +      -       -      -
    118M  ILE*     3.2    20.0    -      -       -      +
    122M  SER*     3.1    30.6    +      -       -      +
    123M  ALA      3.1     7.2    +      -       -      +
    125M  ALA*     1.3    74.5    -      -       -      +
    127M  VAL*     1.3    65.6    +      -       -      +
    129M  ARG*     3.2    32.8    +      -       -      +
    130M  ASP*     3.0    26.5    +      -       -      -
----------------------------------------------------------
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Residues in contact with VAL 127 (chain M). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     49M  LEU*     5.6     1.3    -      -       +      -
     53M  LEU*     3.8    21.8    -      -       +      -
     56M  TYR*     3.5    27.4    -      -       +      -
     72M  LEU*     4.4     7.9    -      -       +      -
     75M  TYR*     4.2    13.0    -      -       +      -
    123M  ALA      3.0    15.5    +      -       -      +
    124M  LEU*     3.3    15.5    -      -       +      +
    126M  ARG*     1.3    72.2    -      -       -      +
    128M  LYS*     1.3    65.1    +      -       -      +
    130M  ASP*     3.2     7.5    +      -       -      +
    131M  PHE*     2.7    39.3    +      -       +      -
    171M  LEU*     3.3    23.3    -      -       +      -
----------------------------------------------------------
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Residues in contact with LYS 128 (chain M). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    124M  LEU      2.9    17.0    +      -       -      +
    125M  ALA*     3.6     6.7    -      -       -      +
    127M  VAL*     1.3    77.6    -      -       -      +
    129M  ARG*     1.3    57.7    +      -       -      +
    131M  PHE*     3.2     4.2    +      -       -      +
    132M  GLU*     2.9    67.1    +      -       +      +
    168M  ILE*     3.7    16.3    -      -       +      +
    171M  LEU*     3.6    22.2    -      -       +      -
    172M  GLY*     3.5    38.8    -      -       -      +
    175M  LEU*     4.2    10.5    -      -       +      -
----------------------------------------------------------
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Residues in contact with ARG 129 (chain M). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    125M  ALA*     3.0    27.7    +      -       -      +
    126M  ARG*     3.3    39.9    -      -       -      +
    128M  LYS*     1.3    76.5    -      -       -      +
    130M  ASP*     1.3    60.0    +      -       -      +
    132M  GLU*     3.2    15.5    +      -       -      +
    133M  TYR*     2.9    27.5    +      -       -      +
----------------------------------------------------------
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Residues in contact with ASP 130 (chain M). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     49M  LEU*     4.2    19.6    -      -       +      +
     52M  LYS*     2.7    43.6    +      -       -      +
     56M  TYR*     5.4     0.7    -      -       -      -
    110M  ILE*     3.8    20.9    -      -       +      +
    111M  ALA      5.4     0.3    +      -       -      -
    126M  ARG      3.0    17.0    +      -       -      +
    127M  VAL*     3.7     9.2    -      -       -      +
    129M  ARG*     1.3    76.3    -      -       -      +
    131M  PHE*     1.3    62.0    +      -       -      +
    133M  TYR*     3.2    10.2    +      -       -      +
    134M  LEU*     2.9    33.8    +      -       -      +
----------------------------------------------------------
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Residues in contact with PHE 131 (chain M). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     49M  LEU*     3.8    30.1    -      -       +      -
     53M  LEU*     4.9     3.4    -      -       +      -
     75M  TYR*     3.8    46.0    -      +       +      -
     79M  VAL*     4.5    10.1    -      -       +      -
    127M  VAL*     2.7    23.9    +      -       +      +
    128M  LYS      3.5     5.4    -      -       -      +
    130M  ASP*     1.3    73.5    -      -       +      +
    132M  GLU*     1.3    58.2    +      -       -      +
    134M  LEU*     3.3     4.7    +      -       +      +
    135M  SER*     2.8    28.9    +      -       -      -
    164M  LEU*     3.8    23.4    -      -       +      +
    167M  ALA*     3.8    28.9    -      -       +      -
    168M  ILE*     3.6    17.7    -      -       +      +
    171M  LEU*     3.7    19.1    -      -       +      -
----------------------------------------------------------
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Residues in contact with GLU 132 (chain M). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    128M  LYS*     2.9    54.2    +      -       -      +
    129M  ARG*     3.5    17.3    -      -       -      +
    130M  ASP      3.2     0.2    -      -       -      -
    131M  PHE*     1.3    75.0    -      -       -      +
    133M  TYR*     1.3    63.3    +      -       -      +
    135M  SER*     3.2     3.5    +      -       -      -
    136M  THR*     3.1    31.2    +      -       +      +
    168M  ILE*     3.8    28.4    -      -       +      +
----------------------------------------------------------
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Residues in contact with TYR 133 (chain M). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     41M  GLN*     3.9    10.9    +      -       -      -
     45M  ASP*     3.1    29.9    +      -       -      -
    109M  GLY*     3.3    31.3    +      -       -      -
    110M  ILE*     3.7    25.1    -      -       +      -
    129M  ARG      2.9    14.2    +      -       -      +
    130M  ASP*     3.6    10.8    -      -       -      +
    132M  GLU*     1.3    76.3    -      -       -      +
    134M  LEU*     1.3    68.5    +      -       +      +
    136M  THR*     3.0    24.5    +      -       -      -
    137M  ARG*     3.1    36.1    +      -       +      +
----------------------------------------------------------
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Residues in contact with LEU 134 (chain M). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     42M  HIS*     5.2     3.4    -      -       -      +
     45M  ASP*     3.8    33.2    -      -       +      +
     46M  LEU*     3.6    21.3    -      -       +      -
     49M  LEU*     3.6    31.9    -      -       +      -
     79M  VAL*     5.7     0.7    -      -       +      -
    110M  ILE*     4.3     7.6    -      -       +      -
    130M  ASP      2.9    17.4    +      -       -      +
    131M  PHE*     3.6     5.2    -      -       +      +
    133M  TYR*     1.3    78.5    -      -       +      +
    135M  SER*     1.3    53.5    +      -       -      +
    137M  ARG*     3.2     6.3    +      -       +      +
    138M  PHE*     2.7    63.8    +      -       +      -
    164M  LEU*     4.0    13.5    -      -       +      -
----------------------------------------------------------
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Residues in contact with SER 135 (chain M). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    131M  PHE      2.8    17.9    +      -       -      -
    132M  GLU*     3.2     6.9    +      -       -      -
    134M  LEU*     1.3    77.7    -      -       -      +
    136M  THR*     1.3    58.1    +      -       -      +
    139M  SER*     2.9    35.1    +      -       -      -
    161M  LEU*     3.7    15.5    +      -       -      +
    164M  LEU*     4.0    14.7    -      -       -      +
    165M  GLY*     5.6     1.7    +      -       -      -
    168M  ILE*     4.0    17.5    -      -       -      +
----------------------------------------------------------
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Residues in contact with THR 136 (chain M). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    132M  GLU*     3.1    15.8    +      -       +      +
    133M  TYR*     3.0    15.5    +      -       -      -
    135M  SER*     1.3    77.3    -      -       -      +
    137M  ARG*     1.3    70.7    +      -       -      +
    139M  SER*     3.3     7.0    +      -       -      -
    140M  GLN*     3.1    29.9    +      -       -      +
----------------------------------------------------------
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Residues in contact with ARG 137 (chain M). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     38M  GLN*     3.5    25.0    -      -       -      +
     41M  GLN*     3.3    29.5    +      -       -      +
     42M  HIS*     3.7    13.9    -      -       +      +
     45M  ASP*     4.9     1.6    -      -       -      +
    133M  TYR*     3.1    44.5    +      -       +      +
    134M  LEU*     3.5    12.1    -      -       +      +
    136M  THR*     1.3    85.8    +      -       -      +
    138M  PHE*     1.3    62.2    +      -       -      +
    140M  GLN*     3.1    44.4    +      -       -      +
    141M  THR*     3.4    14.0    +      -       -      -
----------------------------------------------------------
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Residues in contact with PHE 138 (chain M). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     42M  HIS*     3.3    39.9    -      +       +      -
     46M  LEU*     3.9    20.4    -      -       +      -
     86M  ILE*     3.4    24.9    -      -       +      -
    134M  LEU*     2.7    51.3    +      -       +      +
    137M  ARG*     1.3    72.3    -      -       -      +
    139M  SER*     1.3    58.0    +      -       -      +
    141M  THR*     3.0     3.5    +      -       -      -
    142M  GLN      2.9    24.1    +      -       -      -
    157M  ILE*     3.3    25.3    -      -       +      +
    160M  ILE*     3.8    18.2    -      -       +      -
    161M  LEU*     3.4    16.6    -      -       +      -
    164M  LEU*     3.5    22.4    -      -       +      -
----------------------------------------------------------
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Residues in contact with SER 139 (chain M). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    135M  SER*     2.9    23.6    +      -       -      -
    136M  THR*     3.6     8.9    -      -       -      -
    137M  ARG      3.3     0.2    -      -       -      -
    138M  PHE*     1.3    76.2    -      -       -      +
    140M  GLN*     1.3    62.8    +      -       -      +
    142M  GLN*     3.2     5.4    +      -       -      +
    143M  VAL*     3.0    30.6    +      -       -      +
    161M  LEU*     4.0    20.6    -      -       -      +
----------------------------------------------------------
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Residues in contact with GLN 140 (chain M). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     38M  GLN*     3.7    12.5    +      -       -      +
    136M  THR*     3.1    19.8    +      -       -      +
    137M  ARG*     3.1    49.2    +      -       -      +
    138M  PHE      3.2     0.6    -      -       -      -
    139M  SER*     1.3    76.4    -      -       -      +
    141M  THR*     1.3    63.4    +      -       -      +
    143M  VAL*     3.2     8.9    +      -       -      +
    144M  LEU*     3.0    29.1    +      -       +      +
----------------------------------------------------------
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Residues in contact with THR 141 (chain M). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     35M  ILE*     4.6     7.6    -      -       +      -
     38M  GLN*     3.1    24.1    +      -       +      +
     39M  LEU*     3.7    28.5    -      -       +      -
     42M  HIS*     2.6    27.4    +      -       -      +
    137M  ARG      3.4     0.4    +      -       -      -
    138M  PHE      3.0     9.3    +      -       -      -
    140M  GLN*     1.3    78.2    -      -       -      +
    142M  GLN*     1.3    56.9    +      -       -      +
    144M  LEU*     3.1     9.1    +      -       -      +
    145M  ALA*     2.8    28.4    +      -       -      +
    153M  THR*     4.4     7.4    -      -       +      -
    157M  ILE*     4.0    14.1    -      -       +      -
----------------------------------------------------------
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Residues in contact with GLN 142 (chain M). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    138M  PHE      2.9     8.0    +      -       -      +
    139M  SER*     3.2     9.8    +      -       -      +
    141M  THR*     1.3    76.4    -      -       -      +
    143M  VAL*     1.3    75.8    +      -       +      +
    145M  ALA*     3.4     6.6    +      -       -      +
    146M  ALA*     2.8    33.3    +      -       -      +
    154M  ASP*     2.9    32.1    -      -       -      +
    157M  ILE*     3.7    26.6    -      -       +      +
    158M  THR*     3.9     9.3    +      -       -      +
    161M  LEU*     4.2    14.6    -      -       +      -
----------------------------------------------------------
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Residues in contact with VAL 143 (chain M). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    139M  SER*     3.0    20.2    +      -       -      +
    140M  GLN*     3.5    10.3    -      -       -      +
    141M  THR      3.2     0.2    -      -       -      -
    142M  GLN*     1.3    92.7    -      -       +      +
    144M  LEU*     1.3    59.2    +      -       +      +
    146M  ALA*     3.3     2.4    +      -       -      +
    147M  GLU*     2.9    60.7    +      -       +      +
----------------------------------------------------------
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Residues in contact with LEU 144 (chain M). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     34M  ALA*     4.0    31.2    -      -       +      +
     35M  ILE*     4.1    13.6    -      -       +      +
     38M  GLN*     4.2    24.5    -      -       +      -
    140M  GLN*     3.0    18.7    +      -       +      +
    141M  THR*     3.1     7.6    +      -       -      +
    143M  VAL*     1.3    80.2    -      -       +      +
    145M  ALA*     1.3    61.7    +      -       -      +
    147M  GLU*     3.9    11.9    -      -       -      +
    148M  SER*     3.0    27.6    +      -       -      -
----------------------------------------------------------
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Residues in contact with ALA 145 (chain M). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     35M  ILE*     3.7     8.4    -      -       +      +
    141M  THR      2.8    17.7    +      -       -      +
    142M  GLN*     3.8     4.0    -      -       -      +
    144M  LEU*     1.3    73.9    -      -       -      +
    146M  ALA*     1.3    62.4    +      -       -      +
    148M  SER*     3.4     6.0    +      -       -      -
    149M  GLY      3.1     3.8    +      -       -      -
    150M  ASP*     2.8    51.9    +      -       +      +
    153M  THR*     4.0    12.8    -      -       +      -
    154M  ASP*     3.8    17.0    -      -       -      +
----------------------------------------------------------
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Residues in contact with ALA 146 (chain M). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    142M  GLN*     2.8    29.3    +      -       -      +
    143M  VAL*     3.3     5.1    +      -       -      +
    145M  ALA*     1.3    77.2    -      -       -      +
    147M  GLU*     1.3    63.9    -      -       +      +
    149M  GLY*     3.3    11.7    +      -       -      -
    154M  ASP*     3.5    20.4    +      -       -      +
----------------------------------------------------------
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Residues in contact with GLU 147 (chain M). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    143M  VAL*     2.9    41.7    +      -       +      +
    144M  LEU*     4.0    11.5    -      -       -      +
    146M  ALA*     1.3    78.3    -      -       +      +
    148M  SER*     1.3    59.6    +      -       -      +
----------------------------------------------------------
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Residues in contact with SER 148 (chain M). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     28M  ASP*     5.6     0.7    -      -       -      -
     31M  ALA*     3.6    28.9    -      -       -      +
     35M  ILE*     3.6    17.2    -      -       -      +
    144M  LEU      3.0    18.3    +      -       -      -
    145M  ALA      3.4     5.2    +      -       -      -
    146M  ALA      3.2     0.2    -      -       -      -
    147M  GLU*     1.3    76.3    -      -       -      +
    149M  GLY*     1.3    60.2    +      -       -      +
    150M  ASP*     3.4     4.9    +      -       -      +
----------------------------------------------------------
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A short description of the analytical approach
The contact analysis used in this page is based upon the approach developed in: Sobolev V., Wade R.C., Vriend G. and Edelman M. PROTEINS (1996) 25, 120-129. Contact legitimacy depends on the hydrophobic-hydrophilic properties of the contacting atoms. In order to define it, for each inter-atomic contact, eight atom classes have been introduced:


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

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

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