Contacts of the helix formed by residues 134 - 157 (chain D) in PDB entry 5XRZ


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 D).
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    103D  PHE*     3.7     2.0    -      -       -      -
    132D  LEU*     3.6     1.2    -      -       -      +
    133D  ALA*     1.3    78.9    -      -       -      +
    135D  LYS*     1.3    64.0    +      -       -      +
    136D  ALA*     3.7     3.1    +      -       -      +
    137D  LEU*     3.6    39.9    +      -       -      +
    138D  SER*     3.0    25.1    +      -       -      -
    130E  GLU*     3.3    25.0    +      -       -      -
----------------------------------------------------------
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Residues in contact with LYS 135 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     96D  VAL*     4.2    20.6    -      -       +      +
    103D  PHE*     3.3    46.9    -      -       +      -
    105D  VAL*     5.6     1.8    -      -       +      -
    134D  SER*     1.3    72.7    +      -       -      +
    136D  ALA*     1.3    64.7    +      -       -      +
    138D  SER*     3.2     4.4    +      -       -      -
    139D  LEU*     2.9    33.4    +      -       +      +
     95E  PHE*     3.6    37.6    -      -       +      +
     97E  ASP*     3.4    28.8    +      -       -      -
----------------------------------------------------------
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Residues in contact with ALA 136 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    134D  SER*     3.3     5.9    +      -       -      +
    135D  LYS*     1.3    78.8    -      -       -      +
    137D  LEU*     1.3    58.0    +      -       -      +
    140D  GLU*     2.9    31.1    +      -       -      +
     95E  PHE*     3.5    24.2    -      -       +      -
    105E  VAL      4.7     1.1    -      -       -      +
    106E  GLY*     4.6     2.7    -      -       -      -
    126E  TYR*     3.8    12.4    -      -       +      -
    128E  VAL*     3.7    38.1    -      -       +      -
    130E  GLU*     5.1     3.1    -      -       +      -
----------------------------------------------------------
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Residues in contact with LEU 137 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    132D  LEU*     4.0    32.3    -      -       +      +
    134D  SER*     3.3    30.4    +      -       -      +
    135D  LYS      3.3     0.4    -      -       -      -
    136D  ALA*     1.3    82.2    -      -       +      +
    138D  SER*     1.3    63.2    +      -       -      +
    140D  GLU*     3.4    16.8    +      -       -      +
    141D  LYS*     2.9    25.8    +      -       -      +
     58E  GLY*     5.7     5.4    -      -       -      +
    128E  VAL*     4.8     6.7    -      -       +      -
    130E  GLU*     4.1    13.2    -      -       -      +
     16L    T      5.7     5.2    -      -       -      +
----------------------------------------------------------
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Residues in contact with SER 138 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    103D  PHE*     3.8    18.3    +      -       -      +
    105D  VAL*     3.8    21.1    -      -       -      -
    129D  SER*     3.1    32.2    +      -       -      -
    132D  LEU*     3.8    11.7    -      -       -      +
    134D  SER      3.0    14.5    +      -       -      -
    135D  LYS      3.6     8.1    -      -       -      -
    137D  LEU*     1.3    77.0    -      -       -      +
    139D  LEU*     1.3    56.2    +      -       -      +
    141D  LYS      3.4     0.2    +      -       -      -
    142D  ALA*     2.9    30.4    +      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 139 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     93D  VAL*     4.6    15.0    -      -       +      -
     96D  VAL*     4.2    14.1    -      -       +      -
    105D  VAL*     3.6    25.4    -      -       +      -
    107D  VAL*     4.7     4.9    -      -       +      -
    135D  LYS*     2.9    21.2    +      -       +      +
    136D  ALA      3.9     0.2    -      -       -      +
    138D  SER*     1.3    72.4    -      -       -      +
    140D  GLU*     1.3    67.3    +      -       -      +
    142D  ALA*     4.4     2.5    -      -       -      +
    143D  ARG*     3.0    34.8    +      -       +      +
     94E  ASP*     3.7    17.7    -      -       +      +
     95E  PHE*     3.6    25.1    -      -       +      -
    126E  TYR*     3.2    31.9    -      -       +      +
----------------------------------------------------------
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Residues in contact with GLU 140 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    136D  ALA      2.9    17.5    +      -       -      +
    137D  LEU*     3.6    16.3    -      -       -      +
    139D  LEU*     1.3    77.2    -      -       -      +
    141D  LYS*     1.3    63.0    +      -       -      +
    143D  ARG*     4.6     0.6    -      -       -      +
    144D  LYS*     3.2    54.8    +      -       +      +
    301D    K      2.8    27.1    -      -       -      -
    126E  TYR*     3.8    29.1    -      -       +      +
    128E  VAL*     4.1    14.8    -      -       -      +
     16L    T      3.5    17.4    -      -       -      +
----------------------------------------------------------
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Residues in contact with LYS 141 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    128D  VAL      3.3    24.9    +      -       -      +
    129D  SER*     3.8    17.3    +      -       -      +
    130D  GLU      5.4     0.8    -      -       -      +
    132D  LEU*     4.9    10.4    -      -       +      +
    137D  LEU      2.9    17.8    +      -       -      +
    138D  SER      3.7     3.6    -      -       -      +
    140D  GLU*     1.3    78.1    -      -       -      +
    142D  ALA*     1.3    63.3    +      -       -      +
    144D  LYS*     4.1     2.0    -      -       -      +
    145D  GLU*     2.9    39.6    +      -       +      +
     13L    T      5.5     3.9    +      -       -      -
     14L    T      3.4    31.4    -      -       -      +
     15L    T      5.0    13.9    -      -       +      +
----------------------------------------------------------
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Residues in contact with ALA 142 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    105D  VAL*     4.0    13.9    -      -       +      +
    107D  VAL*     3.7    26.6    -      -       +      +
    127D  GLY*     3.3    27.9    -      -       -      +
    128D  VAL      4.2     3.4    -      -       -      +
    129D  SER      4.7     2.2    -      -       -      +
    138D  SER      2.9    18.8    +      -       -      +
    139D  LEU      3.2     2.2    +      -       -      +
    141D  LYS*     1.3    77.2    -      -       -      +
    143D  ARG*     1.3    58.2    +      -       -      +
    146D  ALA*     2.9    27.0    +      -       -      +
----------------------------------------------------------
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Residues in contact with ARG 143 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     91D  GLN*     2.4    56.3    +      -       -      +
     93D  VAL*     3.8    23.7    -      -       -      +
    107D  VAL*     3.9    17.3    -      -       +      -
    139D  LEU*     3.0    21.4    +      -       +      +
    140D  GLU*     4.6     1.8    -      -       -      +
    142D  ALA*     1.3    76.5    -      -       -      +
    144D  LYS*     1.3    64.4    +      -       +      +
    146D  ALA*     3.2     1.0    +      -       -      +
    147D  VAL*     3.0    21.2    +      -       -      +
     92E  ASN*     5.0     5.3    -      -       -      +
     94E  ASP*     2.8    27.9    +      -       -      -
    108E  CYS*     2.7    47.1    -      -       -      -
    110E  PHE*     4.4     5.1    -      -       -      -
    124E  VAL*     4.4    11.2    -      -       +      -
    126E  TYR*     4.2     9.2    -      -       +      -
----------------------------------------------------------
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Residues in contact with LYS 144 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    140D  GLU*     3.2    50.4    +      -       +      +
    141D  LYS*     4.2     2.2    -      -       -      +
    142D  ALA      3.4     0.2    -      -       -      -
    143D  ARG*     1.3    77.2    -      -       +      +
    145D  GLU*     1.3    62.4    +      -       -      +
    147D  VAL*     3.3     3.4    +      -       -      +
    148D  THR*     2.9    30.1    +      -       -      -
    124E  VAL*     4.7    11.0    -      -       +      -
    125E  GLY*     4.3     2.7    -      -       -      -
    126E  TYR*     4.0    14.8    -      -       -      +
    149E  ASP*     2.7    30.9    +      -       -      -
    153E  ARG*     3.7    37.2    +      -       -      +
     14L    T      5.5     0.4    -      -       -      +
     15L    T      4.3    12.8    -      -       -      +
     16L    T      3.3    20.4    +      -       -      +
----------------------------------------------------------
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Residues in contact with GLU 145 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    301C    K      4.2    13.3    -      -       -      -
    126D  TYR      3.8     9.6    -      -       -      +
    127D  GLY*     3.8     2.5    -      -       -      -
    128D  VAL*     3.5    26.3    +      -       -      +
    141D  LYS*     2.9    47.1    +      -       +      +
    142D  ALA      3.8     2.9    -      -       -      +
    144D  LYS*     1.3    76.8    -      -       -      +
    146D  ALA*     1.3    57.2    +      -       -      +
    148D  THR*     3.9     1.2    -      -       -      -
    149D  ASP*     2.9    35.2    +      -       +      +
     13L    T      5.2     9.1    -      -       -      +
     14L    T      4.2    37.9    +      -       -      +
----------------------------------------------------------
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Residues in contact with ALA 146 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    107D  VAL*     3.6    17.5    -      -       +      +
    108D  CYS      4.0     0.7    -      -       -      -
    109D  ALA*     3.9    14.7    -      -       +      +
    125D  GLY*     3.4    17.8    -      -       -      +
    126D  TYR      3.4    11.7    -      -       -      -
    127D  GLY*     3.4    13.2    -      -       -      +
    142D  ALA      2.9    19.1    +      -       -      +
    143D  ARG      3.2     4.7    +      -       -      +
    145D  GLU*     1.3    77.3    -      -       -      +
    147D  VAL*     1.3    57.0    +      -       -      +
    150D  GLY*     2.9    25.1    +      -       -      -
----------------------------------------------------------
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Residues in contact with VAL 147 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     86D  HIS*     5.0     5.2    -      -       +      +
     88D  ILE*     3.6    24.7    -      -       +      -
     91D  GLN*     3.3    27.1    -      -       -      +
    109D  ALA*     3.7    12.6    -      -       +      -
    111D  VAL*     3.4     9.1    -      -       +      +
    143D  ARG      3.0    10.8    +      -       -      +
    144D  LYS      3.9     2.5    -      -       -      +
    146D  ALA*     1.3    75.1    -      -       -      +
    148D  THR*     1.3    59.9    +      -       -      +
    150D  GLY      3.3     0.9    +      -       -      -
    151D  LEU*     2.9    26.9    +      -       +      +
    122E  GLU      4.8     1.6    -      -       -      +
    123E  ASP*     3.7    31.2    -      -       -      +
    124E  VAL*     3.5    18.8    -      -       +      -
    153E  ARG*     4.7     0.2    -      -       -      +
----------------------------------------------------------
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Residues in contact with THR 148 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     68D  GLY*     4.4    19.3    -      -       -      -
     72D  ILE*     6.3     3.1    -      -       +      -
    144D  LYS      2.9    18.0    +      -       -      -
    145D  GLU*     3.9     4.3    -      -       -      -
    147D  VAL*     1.3    77.5    -      -       -      +
    149D  ASP*     1.3    57.5    +      -       -      +
    151D  LEU*     3.2    12.1    +      -       +      +
    152D  LYS*     2.9    33.4    +      -       +      +
    123E  ASP*     5.0     0.7    +      -       -      -
    153E  ARG*     3.1    10.6    +      -       -      -
     14L    T      4.7    10.5    -      -       -      +
     15L    T      3.1    33.1    +      -       -      +
----------------------------------------------------------
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Residues in contact with ASP 149 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    140C  GLU*     5.3     1.4    -      -       -      +
    144C  LYS*     2.9    35.9    +      -       -      -
    125D  GLY*     3.6     3.6    -      -       -      -
    126D  TYR      3.8    15.0    -      -       -      +
    145D  GLU*     2.9    20.8    +      -       +      +
    146D  ALA      3.8     2.2    -      -       -      +
    148D  THR*     1.3    77.0    -      -       -      +
    150D  GLY*     1.3    56.6    +      -       -      +
    152D  LYS*     3.3    29.9    +      -       -      +
    153D  ARG*     2.9    30.1    +      -       -      +
     12L    T      3.6    10.4    +      -       -      +
     13L    T      4.2     5.9    +      -       -      -
----------------------------------------------------------
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Residues in contact with GLY 150 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    111D  VAL*     3.5    16.8    -      -       -      +
    123D  ASP      4.1     2.6    -      -       -      +
    124D  VAL      3.5    19.1    -      -       -      -
    125D  GLY*     3.3     9.1    -      -       -      -
    146D  ALA      2.9    12.9    +      -       -      -
    147D  VAL      3.7     3.4    -      -       -      -
    149D  ASP*     1.3    73.9    -      -       -      +
    151D  LEU*     1.3    59.0    +      -       -      +
    153D  ARG*     3.4     1.0    +      -       -      +
    154D  ALA*     2.9    31.9    +      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 151 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     72D  ILE*     4.4    21.8    -      -       +      -
     84D  TRP*     3.8    18.4    -      -       +      -
     86D  HIS*     3.6    47.1    -      -       +      +
    111D  VAL*     3.5    10.0    -      -       +      +
    113D  VAL*     3.7    13.7    -      -       +      -
    147D  VAL*     2.9    15.5    +      -       +      +
    148D  THR*     3.5    14.4    -      -       +      +
    150D  GLY*     1.3    75.1    -      -       -      +
    152D  LYS*     1.3    59.0    +      -       +      +
    154D  ALA*     3.3     1.5    +      -       -      -
    155D  LEU*     2.9    43.3    +      -       +      +
    123E  ASP*     5.7     2.5    -      -       -      +
    157E  SER*     4.8     2.0    -      -       -      +
----------------------------------------------------------
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Residues in contact with LYS 152 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     65D  TYR*     5.3     0.8    -      -       -      +
     66D  ILE*     3.7    22.4    +      -       +      +
     68D  GLY*     4.4     9.4    -      -       -      +
     71D  VAL*     4.2    25.7    -      -       +      +
    148D  THR*     2.9    21.2    +      -       +      +
    149D  ASP*     3.3    32.9    +      -       -      +
    151D  LEU*     1.3    76.2    -      -       +      +
    153D  ARG*     1.3    58.8    +      -       +      +
    155D  LEU*     3.3     5.6    +      -       -      +
    156D  ARG*     2.9    40.4    +      -       +      +
    162D  LEU      4.7     1.6    -      -       -      +
     13L    T      3.0    24.7    +      -       -      -
     14L    T      2.9    25.4    +      -       -      +
----------------------------------------------------------
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Residues in contact with ARG 153 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    144C  LYS*     3.7    29.2    +      -       -      +
    147C  VAL*     4.6     1.2    -      -       -      +
    148C  THR*     3.2    10.9    +      -       -      -
    123D  ASP*     2.9    49.0    +      -       -      +
    124D  VAL      3.2    24.1    +      -       -      +
    149D  ASP*     2.9    15.8    +      -       -      +
    150D  GLY      3.9     0.7    -      -       -      +
    152D  LYS*     1.3    77.6    -      -       +      +
    154D  ALA*     1.3    60.4    +      -       -      +
    156D  ARG*     3.4    31.9    -      -       -      +
    157D  SER*     3.8     7.6    +      -       -      -
     11L    T      3.0    38.7    +      -       -      -
     12L    T      2.9    43.1    +      -       -      +
----------------------------------------------------------
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Residues in contact with ALA 154 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    111D  VAL      3.7    19.5    -      -       -      +
    113D  VAL*     3.6    24.8    -      -       +      +
    121D  HIS*     3.7    28.3    +      -       -      +
    122D  GLU      4.9     0.7    -      -       -      -
    123D  ASP*     3.9    10.5    -      -       -      +
    150D  GLY      2.9    19.1    +      -       -      +
    151D  LEU      3.8     0.9    -      -       -      +
    153D  ARG*     1.3    75.9    -      -       -      +
    155D  LEU*     1.3    63.6    +      -       -      +
    156D  ARG      3.2     0.6    +      -       -      -
    157D  SER*     3.6    11.0    +      -       -      -
    158D  PHE*     4.6     2.4    -      -       -      -
----------------------------------------------------------
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Residues in contact with LEU 155 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     71D  VAL*     3.8    32.8    -      -       +      +
     72D  ILE*     5.2     1.1    -      -       +      +
     75D  ALA*     4.0    25.4    -      -       +      -
     79D  PHE*     4.8     2.5    -      -       +      -
     84D  TRP*     4.1    11.7    -      -       +      -
    113D  VAL*     3.8    24.0    -      -       +      -
    151D  LEU*     2.9    43.9    +      -       +      +
    152D  LYS      3.9     3.4    -      -       -      +
    154D  ALA*     1.3    74.1    -      -       -      +
    156D  ARG*     1.3    65.5    +      -       -      +
    157D  SER      3.2     0.6    +      -       -      -
    158D  PHE*     3.4    25.3    +      -       +      +
    162D  LEU*     3.3    27.0    -      -       +      +
----------------------------------------------------------
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Residues in contact with ARG 156 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     72C  ILE*     5.2     4.3    -      -       +      -
    152D  LYS*     2.9    25.3    +      -       +      +
    153D  ARG*     3.4    31.6    -      -       -      +
    154D  ALA      3.2     0.4    -      -       -      -
    155D  LEU*     1.3    76.9    -      -       -      +
    157D  SER*     1.3    53.3    +      -       -      +
    158D  PHE      2.8    12.0    +      -       -      -
    159D  GLY      3.3    18.2    +      -       -      +
    162D  LEU      3.7     8.0    +      -       -      +
    163D  GLY*     3.5    28.6    +      -       -      +
    164D  ASN*     3.5    18.0    -      -       -      +
    166D  ILE*     3.4    25.2    -      -       -      +
    167D  LEU*     3.6    24.1    -      -       -      +
     12L    T      2.4    48.4    +      -       -      -
     13L    T      5.6     1.0    +      -       -      -
----------------------------------------------------------
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Residues in contact with SER 157 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     72C  ILE*     4.1    24.5    -      -       -      +
     76C  ASN*     3.3    17.9    +      -       -      +
     84C  TRP*     3.7     9.3    -      -       -      -
     86C  HIS*     3.9    16.8    +      -       -      -
    151C  LEU*     5.0     0.5    -      -       -      +
    121D  HIS*     3.4    40.6    -      -       -      -
    123D  ASP*     4.7     2.8    +      -       -      -
    153D  ARG      3.8    12.1    +      -       -      -
    154D  ALA*     3.6     5.1    +      -       -      -
    155D  LEU      3.2     1.8    -      -       -      -
    156D  ARG*     1.3    73.6    -      -       -      +
    158D  PHE*     1.3    56.2    +      -       -      +
    159D  GLY      3.6     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