Contacts of the helix formed by residues 137 - 162 (chain A) in PDB entry 3AXJ


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 ASP 137 (chain A).
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     85A  TYR*     4.2     7.6    +      -       +      +
     86A  TYR*     2.6    39.7    +      -       +      +
     93A  THR*     6.3     0.2    -      -       +      -
    135A  HIS*     3.8    12.9    +      -       -      +
    136A  LEU*     1.3    79.4    -      -       -      +
    138A  VAL*     1.3    65.0    +      -       -      +
    139A  GLU*     2.7    42.0    +      -       -      +
    140A  ASP*     3.1    31.4    +      -       +      +
    141A  TYR      3.1     8.8    +      -       -      -
     44B  LYS*     4.5     5.1    +      -       -      -
    112B  GLN*     4.5     4.9    +      -       -      -
----------------------------------------------------------
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Residues in contact with VAL 138 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    117A  ARG*     3.9    16.3    -      -       +      +
    136A  LEU      3.5     4.2    +      -       -      -
    137A  ASP*     1.3    74.8    +      -       -      +
    139A  GLU*     1.3    61.9    +      -       +      +
    141A  TYR*     3.3     8.2    +      -       +      +
    142A  LEU*     2.9    35.0    +      -       +      +
     37B  TYR*     3.9    34.8    -      -       +      +
     40B  GLU*     3.6    32.5    -      -       +      +
     41B  LEU*     3.9    22.9    -      -       +      -
     44B  LYS*     5.5     2.9    -      -       +      +
----------------------------------------------------------
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Residues in contact with GLU 139 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    137A  ASP*     2.7    19.7    +      -       -      +
    138A  VAL*     1.3    69.5    -      -       +      +
    140A  ASP*     1.3    58.8    +      -       -      +
    142A  LEU*     3.3     7.2    +      -       -      +
    143A  LEU*     2.9    41.7    +      -       +      +
    190A  ASP*     4.5     9.2    -      -       -      +
    192A  LEU*     4.1    19.5    -      -       +      +
     41B  LEU*     3.8    22.7    -      -       +      +
     44B  LYS*     2.6    36.9    +      -       -      +
----------------------------------------------------------
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Residues in contact with ASP 140 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     85A  TYR*     5.1     3.3    +      -       -      -
     92A  TRP*     5.0     3.6    -      -       -      -
     93A  THR*     3.4    35.8    -      -       -      +
     96A  THR*     4.1    10.9    +      -       +      +
     97A  GLN*     3.0    38.5    +      -       +      +
    100A  ILE*     3.4    12.2    -      -       +      +
    136A  LEU*     4.3    10.1    -      -       +      -
    137A  ASP*     3.1    25.7    +      -       +      +
    139A  GLU*     1.3    75.7    -      -       -      +
    141A  TYR*     1.3    59.9    +      -       -      +
    143A  LEU*     4.7     1.0    -      -       -      +
    144A  GLY      3.0    22.9    +      -       -      -
----------------------------------------------------------
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Residues in contact with TYR 141 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    100A  ILE*     3.6    23.1    -      -       +      +
    114A  LEU*     3.8    16.6    -      -       -      +
    115A  VAL*     2.6    27.8    +      -       +      -
    116A  THR*     3.7     2.9    -      -       -      -
    117A  ARG*     3.4    49.1    -      -       +      -
    120A  VAL*     4.2    11.4    -      -       +      -
    136A  LEU*     4.4     3.1    -      -       +      -
    137A  ASP      3.1     9.1    +      -       -      +
    138A  VAL*     3.5     7.9    -      -       +      +
    139A  GLU      3.2     0.2    -      -       -      -
    140A  ASP*     1.3    77.0    -      -       -      +
    142A  LEU*     1.3    74.5    +      -       +      +
    144A  GLY*     3.2     2.1    +      -       -      -
    145A  ILE*     3.1    51.2    +      -       +      +
     33B  GLN*     5.6     0.3    +      -       -      -
     37B  TYR*     3.6    32.6    +      +       -      -
----------------------------------------------------------
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Residues in contact with LEU 142 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    138A  VAL*     2.9    31.5    +      -       +      +
    139A  GLU      3.3     3.8    +      -       -      +
    141A  TYR*     1.3    94.1    -      -       +      +
    143A  LEU*     1.3    61.4    +      -       -      +
    145A  ILE*     3.4     6.7    -      -       +      +
    146A  LEU*     3.2    26.7    +      -       -      +
    182A  PHE*     3.6    13.1    -      -       +      -
    185A  LEU*     3.9    10.3    -      -       +      -
    192A  LEU*     3.9    22.7    -      -       +      -
     34B  PHE*     3.9    28.0    -      -       +      -
     37B  TYR*     4.2    10.5    -      -       +      -
     41B  LEU*     3.8    32.1    -      -       +      -
----------------------------------------------------------
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Residues in contact with LEU 143 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     97A  GLN*     3.2    39.0    -      -       -      +
    139A  GLU*     2.9    28.6    +      -       +      +
    140A  ASP*     4.0     1.3    -      -       -      +
    142A  LEU*     1.3    75.4    -      -       -      +
    144A  GLY*     1.3    62.1    +      -       -      +
    146A  LEU*     3.6    13.3    +      -       +      +
    147A  GLN*     3.6    16.8    +      -       -      +
    191A  GLY      4.7     0.9    -      -       -      +
    192A  LEU*     3.6    28.5    -      -       +      +
    195A  ARG*     3.7    56.7    +      -       +      +
----------------------------------------------------------
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Residues in contact with GLY 144 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     97A  GLN*     3.4    27.3    -      -       -      +
    100A  ILE*     3.9     9.6    -      -       -      -
    101A  PHE*     3.6    11.3    -      -       -      +
    140A  ASP      3.0    15.5    +      -       -      -
    141A  TYR      3.2     3.5    +      -       -      -
    143A  LEU*     1.3    77.0    -      -       -      +
    145A  ILE*     1.3    60.7    +      -       -      +
    147A  GLN*     3.1    23.3    +      -       -      +
    148A  LEU      3.9     0.7    +      -       -      -
----------------------------------------------------------
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Residues in contact with ILE 145 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    100A  ILE*     4.1     9.0    -      -       +      -
    104A  ALA*     4.2    11.4    -      -       +      -
    114A  LEU*     4.0    19.3    -      -       +      -
    141A  TYR*     3.1    53.8    +      -       +      +
    142A  LEU*     3.4    15.7    -      -       +      +
    144A  GLY*     1.3    73.0    -      -       -      +
    146A  LEU*     1.3    59.7    +      -       -      +
    148A  LEU*     3.0    33.7    -      -       +      +
    178A  LEU*     3.7    32.4    -      -       +      +
    182A  PHE*     3.7    15.9    -      -       +      -
     34B  PHE*     3.8    14.1    -      -       +      -
----------------------------------------------------------
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Residues in contact with LEU 146 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    142A  LEU      3.2    16.9    +      -       -      +
    143A  LEU*     3.7    11.7    -      -       +      +
    144A  GLY      3.2     0.2    -      -       -      -
    145A  ILE*     1.3    78.7    -      -       -      +
    147A  GLN*     1.3    59.4    +      -       -      +
    148A  LEU      3.3     0.7    +      -       -      -
    149A  ALA*     3.4    17.0    +      -       -      +
    150A  SER*     4.3     3.6    +      -       -      -
    178A  LEU*     5.0     3.1    -      -       +      -
    182A  PHE*     3.5    36.8    -      -       +      -
    192A  LEU*     4.3    12.3    -      -       +      -
    195A  ARG*     4.1    17.3    -      -       +      +
    196A  PHE*     3.9    33.7    -      -       -      +
    199A  LEU*     4.3    27.2    -      -       +      +
    202A  ASP*     5.4     0.5    -      -       -      +
----------------------------------------------------------
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Residues in contact with GLN 147 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     94A  PHE*     5.3     6.7    +      -       -      -
     97A  GLN*     3.8    34.3    +      -       -      +
     98A  ARG*     2.7    45.0    +      -       -      +
    101A  PHE*     3.6    27.3    -      -       +      +
    143A  LEU      3.7    12.4    +      -       -      +
    144A  GLY      3.1    10.6    +      -       -      +
    146A  LEU*     1.3    73.8    -      -       +      +
    148A  LEU*     1.3    64.8    +      -       -      +
    149A  ALA      3.3     0.9    +      -       -      -
    150A  SER*     3.3    19.7    +      -       -      -
    151A  GLU*     3.5     6.8    +      -       -      +
    195A  ARG*     5.5     3.0    -      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 148 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    101A  PHE*     3.7    12.9    -      -       +      -
    104A  ALA*     3.9    24.9    -      -       +      +
    105A  LEU*     3.8    43.7    -      -       +      +
    108A  TYR*     5.2     0.9    -      -       +      -
    114A  LEU*     4.2    10.5    -      -       +      -
    145A  ILE*     3.0    21.0    +      -       +      +
    147A  GLN*     1.3    77.9    -      -       -      +
    149A  ALA*     1.3    56.9    +      -       -      +
    151A  GLU*     3.2     2.4    +      -       -      +
    152A  LEU*     2.8    46.7    +      -       +      +
    174A  PHE*     3.6    31.2    -      -       +      -
    175A  ILE*     4.7     3.8    -      -       +      -
    178A  LEU*     4.8     4.0    -      -       +      -
----------------------------------------------------------
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Residues in contact with ALA 149 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    145A  ILE      4.2     0.6    +      -       -      -
    146A  LEU      3.4     8.0    +      -       -      +
    147A  GLN      3.3     1.2    -      -       -      -
    148A  LEU*     1.3    78.5    -      -       -      +
    150A  SER*     1.3    58.3    +      -       -      +
    152A  LEU*     3.8     0.3    -      -       -      +
    153A  SER*     2.9    30.3    +      -       -      -
    175A  ILE*     4.0    21.7    -      -       +      +
    178A  LEU*     5.4     0.4    -      -       +      -
    199A  LEU*     3.3    34.5    -      -       +      -
    202A  ASP*     3.7    20.4    -      -       +      +
    206A  ILE*     4.3     2.1    -      -       +      +
----------------------------------------------------------
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Residues in contact with SER 150 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    146A  LEU      4.3     2.6    +      -       -      -
    147A  GLN*     3.3    16.5    +      -       -      -
    149A  ALA*     1.3    76.1    -      -       -      +
    151A  GLU*     1.3    61.5    +      -       -      +
    153A  SER*     3.0    19.2    +      -       -      -
    154A  ARG*     3.2    11.4    +      -       -      +
    202A  ASP*     3.6    18.7    +      -       -      -
    205A  LYS*     5.1     0.9    +      -       -      -
----------------------------------------------------------
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Residues in contact with GLU 151 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     45A  LEU      5.1     1.6    -      -       -      +
     46A  GLN*     3.8    16.2    +      -       -      -
     48A  ILE*     4.4     6.0    -      -       +      +
     49A  HIS*     2.5    34.2    +      -       +      +
    101A  PHE*     3.6    40.7    -      -       +      -
    105A  LEU*     4.0    23.2    -      -       +      +
    147A  GLN      3.5     2.4    +      -       -      +
    148A  LEU      3.2     4.1    +      -       -      +
    150A  SER*     1.3    78.0    -      -       -      +
    152A  LEU*     1.3    59.8    +      -       -      +
    154A  ARG*     3.2    13.3    +      -       -      +
    155A  PHE*     3.0    25.1    +      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 152 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    105A  LEU*     3.8    18.4    -      -       +      -
    108A  TYR*     3.7    33.7    -      -       +      -
    148A  LEU*     2.8    29.9    +      -       +      +
    149A  ALA      4.2     2.0    -      -       -      +
    151A  GLU*     1.3    79.7    -      -       -      +
    153A  SER*     1.3    55.5    +      -       -      +
    155A  PHE*     3.6    18.1    -      -       +      +
    156A  ALA*     2.8    30.0    +      -       -      +
    171A  ILE*     3.6    21.3    -      -       +      +
    174A  PHE*     3.6    38.1    -      -       +      -
    175A  ILE*     3.8    13.7    -      -       +      -
----------------------------------------------------------
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Residues in contact with SER 153 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    149A  ALA      2.9    16.9    +      -       -      -
    150A  SER*     3.0    13.9    +      -       -      -
    152A  LEU*     1.3    73.0    -      -       -      +
    154A  ARG*     1.3    66.4    +      -       -      +
    156A  ALA*     3.8     2.5    -      -       -      +
    157A  THR*     3.3    23.2    +      -       -      -
    202A  ASP*     3.6    21.0    +      -       -      -
    205A  LYS*     3.7    28.5    +      -       -      +
    206A  ILE*     3.7    26.8    -      -       -      +
    209A  VAL*     5.4     0.5    -      -       -      +
----------------------------------------------------------
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Residues in contact with ARG 154 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     46A  GLN*     2.9    33.3    +      -       -      +
     49A  HIS*     3.3    39.2    +      -       +      +
    150A  SER      3.2     9.3    +      -       -      +
    151A  GLU*     3.2    17.1    +      -       -      +
    153A  SER*     1.3    81.0    +      -       -      +
    155A  PHE*     1.3    54.6    +      -       -      +
    157A  THR*     3.3     7.3    +      -       -      -
    158A  ASN*     3.1    40.7    +      -       -      +
    205A  LYS*     4.1    12.5    -      -       -      +
----------------------------------------------------------
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Residues in contact with PHE 155 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     48A  ILE*     3.3    48.0    -      -       +      -
     49A  HIS*     3.7    13.2    -      -       +      -
     52A  LEU*     3.8     8.1    -      -       +      -
     55A  ILE*     4.0    20.9    -      -       +      -
    108A  TYR*     4.6     0.9    -      +       -      -
    109A  LEU*     3.8    18.4    -      -       +      -
    151A  GLU      3.0    15.6    +      -       -      +
    152A  LEU*     3.6    18.8    -      -       +      +
    153A  SER      3.3     0.2    -      -       -      -
    154A  ARG*     1.3    73.3    -      -       -      +
    156A  ALA*     1.3    58.5    +      -       -      +
    158A  ASN*     4.5     0.7    -      -       +      +
    159A  SER*     2.8    46.6    +      -       -      -
    167A  ARG*     3.4    36.8    -      -       -      -
    171A  ILE*     3.8    16.4    -      -       +      -
----------------------------------------------------------
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Residues in contact with ALA 156 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    152A  LEU      2.8    21.3    +      -       -      +
    153A  SER*     3.8     8.7    -      -       -      +
    155A  PHE*     1.3    73.7    -      -       -      +
    157A  THR*     1.3    63.4    +      -       -      +
    159A  SER*     3.5     5.2    +      -       -      -
    160A  VAL*     3.3    24.4    +      -       -      +
    168A  PRO*     4.0    20.2    -      -       +      +
    171A  ILE*     3.7    18.8    -      -       +      +
    206A  ILE*     4.6    12.3    -      -       +      -
    209A  VAL*     4.4    11.7    -      -       +      -
----------------------------------------------------------
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Residues in contact with THR 157 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    153A  SER      3.3    10.5    +      -       -      -
    154A  ARG*     3.3    10.9    +      -       -      -
    155A  PHE      3.3     0.6    -      -       -      -
    156A  ALA*     1.3    76.8    -      -       -      +
    158A  ASN*     1.3    70.2    +      -       -      +
    160A  VAL*     3.2     7.6    +      -       -      +
    161A  THR*     3.1    27.9    +      -       -      +
    205A  LYS*     3.9    14.9    -      -       -      +
    209A  VAL*     3.7    22.3    -      -       +      +
----------------------------------------------------------
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Residues in contact with ASN 158 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     48A  ILE      5.1     0.2    -      -       -      +
     49A  HIS*     3.0    54.6    +      -       -      +
    154A  ARG*     3.1    24.7    +      -       -      +
    155A  PHE*     3.3     3.8    +      -       -      +
    157A  THR*     1.3    80.0    -      -       -      +
    159A  SER*     1.3    66.3    +      -       -      +
    161A  THR*     3.3    13.5    +      -       -      +
    162A  MSE      3.0    33.4    +      -       +      +
----------------------------------------------------------
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Residues in contact with SER 159 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     52A  LEU*     4.3     3.5    -      -       -      +
    155A  PHE*     2.8    42.3    +      -       -      -
    156A  ALA      3.6     5.2    -      -       -      -
    157A  THR      3.3     0.2    -      -       -      -
    158A  ASN*     1.3    76.9    -      -       -      +
    160A  VAL*     1.3    60.3    +      -       -      +
    162A  MSE      3.2    12.4    +      -       -      +
    163A  GLY      3.1     4.9    +      -       -      -
    164A  ASP*     2.8    33.8    +      -       -      +
    167A  ARG*     3.5    32.8    -      -       -      +
    168A  PRO*     5.0     0.2    -      -       -      -
----------------------------------------------------------
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Residues in contact with VAL 160 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    156A  ALA      3.3     6.2    +      -       -      +
    157A  THR*     3.2     8.3    +      -       -      +
    159A  SER*     1.3    74.1    -      -       -      +
    161A  THR*     1.3    67.9    +      -       -      +
    163A  GLY*     2.8    15.9    +      -       -      +
    164A  ASP      4.1     7.2    -      -       -      +
    165A  TYR*     3.9    24.5    +      -       +      -
    168A  PRO*     3.5    32.3    -      -       +      -
    209A  VAL*     3.7    13.0    -      -       +      -
    213A  VAL*     3.9    14.6    -      -       +      -
    218A  LEU*     5.4     2.9    -      -       +      -
----------------------------------------------------------
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Residues in contact with THR 161 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    157A  THR*     3.1    18.8    +      -       -      +
    158A  ASN*     3.4    17.0    +      -       -      +
    160A  VAL*     1.3    80.0    -      -       -      +
    162A  MSE      1.3    63.2    +      -       +      +
    163A  GLY      3.5     0.9    +      -       -      -
----------------------------------------------------------
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Residues in contact with MSE 162 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     48A  ILE      3.4    25.6    -      -       -      +
     49A  HIS      3.7    11.4    -      -       -      +
     50A  SER*     3.3    35.7    -      -       -      +
     51A  ASP*     3.6     3.1    -      -       -      -
     52A  LEU*     3.4    37.9    -      -       +      +
    158A  ASN*     3.0    35.3    +      -       +      +
    159A  SER*     3.5     6.5    -      -       -      +
    160A  VAL      3.0     0.4    -      -       -      -
    161A  THR*     1.3    82.1    -      -       +      +
    163A  GLY*     1.3    59.1    +      -       -      +
    164A  ASP      3.5     0.8    +      -       -      -
----------------------------------------------------------
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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