Contacts of the helix formed by residues 134 - 157 (chain I) 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 I).
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    103I  PHE*     3.7     1.8    -      -       -      -
    132I  LEU*     3.6     1.5    -      -       -      +
    133I  ALA*     1.3    77.6    -      -       -      +
    135I  LYS*     1.3    65.0    +      -       -      +
    136I  ALA      3.8     2.4    +      -       -      -
    137I  LEU*     3.7    32.1    +      -       -      +
    138I  SER*     3.1    24.9    +      -       -      -
    130J  GLU*     3.0    35.0    +      -       -      -
----------------------------------------------------------
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Residues in contact with LYS 135 (chain I). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     96I  VAL*     4.1    20.9    -      -       +      +
    103I  PHE*     3.3    46.7    -      -       +      -
    105I  VAL*     5.7     1.1    -      -       +      -
    134I  SER*     1.3    71.0    +      -       -      +
    136I  ALA*     1.3    64.4    +      -       -      +
    138I  SER*     3.3     4.1    +      -       -      -
    139I  LEU*     2.9    36.2    +      -       +      +
     95J  PHE*     3.5    38.0    -      -       +      +
     97J  ASP*     3.3    32.8    +      -       -      +
    130J  GLU*     5.4     0.4    +      -       -      -
----------------------------------------------------------
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Residues in contact with ALA 136 (chain I). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    134I  SER*     3.3     5.6    +      -       -      +
    135I  LYS*     1.3    78.8    -      -       -      +
    137I  LEU*     1.3    58.8    +      -       -      +
    139I  LEU      3.4     0.3    +      -       -      -
    140I  GLU*     2.9    31.1    +      -       -      +
     95J  PHE*     3.3    24.1    -      -       +      -
    105J  VAL      4.3     2.2    -      -       -      +
    106J  GLY*     4.3     3.8    -      -       -      -
    126J  TYR*     3.6    13.4    -      -       +      -
    128J  VAL*     3.6    35.7    -      -       +      -
    130J  GLU*     5.0     3.6    -      -       +      +
----------------------------------------------------------
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Residues in contact with LEU 137 (chain I). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    132I  LEU*     4.0    31.0    -      -       +      +
    134I  SER*     3.4    30.6    +      -       -      +
    135I  LYS      3.3     0.4    -      -       -      -
    136I  ALA*     1.3    78.1    -      -       -      +
    138I  SER*     1.3    64.0    +      -       -      +
    140I  GLU*     3.3    13.6    +      -       -      +
    141I  LYS*     3.0    24.8    +      -       -      +
    128J  VAL*     4.4    15.9    -      -       +      -
    130J  GLU*     3.8    13.5    -      -       -      +
----------------------------------------------------------
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Residues in contact with SER 138 (chain I). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    103I  PHE*     3.9    16.4    +      -       -      +
    105I  VAL*     3.8    18.8    -      -       -      -
    129I  SER*     3.1    35.7    +      -       -      -
    132I  LEU*     3.4    16.1    -      -       -      +
    134I  SER      3.1    18.1    +      -       -      -
    135I  LYS      3.6     4.3    -      -       -      -
    137I  LEU*     1.3    75.7    -      -       -      +
    139I  LEU*     1.3    58.2    +      -       -      +
    142I  ALA*     2.9    27.1    +      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 139 (chain I). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     93I  VAL*     4.4    15.5    -      -       +      -
     96I  VAL*     3.9    16.4    -      -       +      -
    105I  VAL*     3.6    26.5    -      -       +      -
    107I  VAL*     4.7     3.8    -      -       +      -
    135I  LYS*     2.9    21.6    +      -       +      +
    138I  SER*     1.3    74.0    -      -       -      +
    140I  GLU*     1.3    65.0    +      -       -      +
    142I  ALA*     4.4     2.0    -      -       -      +
    143I  ARG*     2.9    33.9    +      -       +      +
     94J  ASP*     3.7    14.4    -      -       +      +
     95J  PHE*     3.5    29.8    -      -       +      -
    126J  TYR*     3.2    30.1    -      -       +      +
----------------------------------------------------------
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Residues in contact with GLU 140 (chain I). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    136I  ALA      2.9    15.2    +      -       -      +
    137I  LEU*     3.6    16.4    -      -       -      +
    139I  LEU*     1.3    76.1    -      -       -      +
    141I  LYS*     1.3    64.4    +      -       -      +
    143I  ARG*     4.0     0.6    -      -       -      +
    144I  LYS*     2.9    66.4    +      -       +      +
    301I    K      2.9    23.7    -      -       -      -
    126J  TYR*     3.6    30.6    -      -       +      +
    128J  VAL*     4.1    15.7    -      -       -      +
     36L    T      5.4     1.4    -      -       -      +
----------------------------------------------------------
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Residues in contact with LYS 141 (chain I). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    128I  VAL      3.2    20.5    +      -       -      +
    129I  SER*     3.7    22.9    +      -       -      +
    130I  GLU      5.1     2.0    -      -       -      +
    132I  LEU*     4.8    11.1    -      -       +      +
    137I  LEU      3.0    16.5    +      -       -      +
    138I  SER      3.7     2.9    -      -       -      +
    140I  GLU*     1.3    77.5    -      -       -      +
    142I  ALA*     1.3    65.5    +      -       -      +
    144I  LYS*     4.0     3.0    -      -       -      +
    145I  GLU*     2.9    34.2    +      -       -      +
     33L    T      5.2     4.5    +      -       -      -
     34L    T      3.2    48.0    +      -       -      +
     35L    T      5.6     4.9    -      -       -      +
----------------------------------------------------------
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Residues in contact with ALA 142 (chain I). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    105I  VAL*     3.7    15.7    -      -       +      +
    107I  VAL*     3.6    27.3    -      -       +      +
    127I  GLY*     3.3    26.9    -      -       -      +
    128I  VAL      4.1     3.4    -      -       -      +
    129I  SER      4.6     2.0    -      -       -      +
    138I  SER      2.9    17.5    +      -       -      +
    139I  LEU      3.3     2.4    +      -       -      +
    141I  LYS*     1.3    76.6    -      -       -      +
    143I  ARG*     1.3    58.8    +      -       -      +
    146I  ALA*     2.9    27.2    +      -       -      +
----------------------------------------------------------
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Residues in contact with ARG 143 (chain I). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     91I  GLN*     2.4    54.9    +      -       -      +
     93I  VAL*     3.8    24.3    -      -       -      +
    107I  VAL*     3.9    20.4    -      -       +      -
    139I  LEU*     2.9    25.5    +      -       +      +
    140I  GLU*     4.1     2.5    -      -       -      +
    142I  ALA*     1.3    76.7    -      -       -      +
    144I  LYS*     1.3    62.7    +      -       +      +
    146I  ALA*     3.2     2.6    +      -       -      +
    147I  VAL*     3.0    21.9    +      -       -      +
     92J  ASN*     4.7     6.1    -      -       -      +
     94J  ASP*     2.9    26.6    +      -       -      -
    108J  CYS*     2.7    40.5    -      -       -      -
    110J  PHE*     4.2     6.2    -      -       -      -
    124J  VAL*     4.5    11.4    -      -       +      -
    126J  TYR*     4.1    15.0    -      -       +      -
----------------------------------------------------------
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Residues in contact with LYS 144 (chain I). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    140I  GLU*     2.9    55.1    +      -       +      +
    141I  LYS*     4.1     2.9    -      -       -      +
    143I  ARG*     1.3    76.1    -      -       +      +
    145I  GLU*     1.3    62.2    +      -       -      +
    147I  VAL*     3.3     3.5    +      -       -      -
    148I  THR*     3.0    28.9    +      -       -      -
    123J  ASP*     5.3     0.7    -      -       -      -
    124J  VAL*     4.9     9.4    -      -       +      +
    125J  GLY*     4.5     1.8    -      -       -      -
    126J  TYR*     4.2    12.3    -      -       +      +
    149J  ASP*     2.9    28.5    +      -       -      -
    153J  ARG*     3.7    40.8    +      -       -      +
     34L    T      6.1     0.2    -      -       +      -
     35L    T      4.3    21.0    +      -       -      +
     36L    T      3.4    14.5    +      -       -      -
     37L    T      5.9     0.2    +      -       -      -
----------------------------------------------------------
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Residues in contact with GLU 145 (chain I). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    301H    K      3.3    22.5    -      -       -      -
    126I  TYR      3.7     8.5    -      -       -      +
    127I  GLY*     3.8     4.0    -      -       -      -
    128I  VAL*     3.3    38.0    +      -       -      +
    141I  LYS*     2.9    23.2    +      -       -      +
    144I  LYS*     1.3    76.4    -      -       -      +
    146I  ALA*     1.3    58.2    +      -       -      +
    148I  THR*     3.9     0.5    -      -       -      -
    149I  ASP*     2.9    36.0    +      -       +      +
     33L    T      5.4    10.0    +      -       -      +
     34L    T      3.6    33.5    +      -       -      +
     35L    T      4.2     9.4    +      -       -      -
----------------------------------------------------------
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Residues in contact with ALA 146 (chain I). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    107I  VAL*     3.6    16.4    -      -       +      +
    108I  CYS      3.9     2.5    -      -       -      -
    109I  ALA*     3.7    17.6    -      -       +      +
    125I  GLY*     3.5    15.9    -      -       -      +
    126I  TYR      3.4    13.0    -      -       -      -
    127I  GLY*     3.5    11.8    -      -       -      +
    142I  ALA      2.9    18.7    +      -       -      +
    143I  ARG      3.2     4.2    +      -       -      +
    145I  GLU*     1.3    76.1    -      -       -      +
    147I  VAL*     1.3    57.8    +      -       -      +
    150I  GLY      2.9    24.4    +      -       -      -
----------------------------------------------------------
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Residues in contact with VAL 147 (chain I). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     86I  HIS*     5.0     5.2    -      -       +      +
     88I  ILE*     3.7    22.4    -      -       +      -
     91I  GLN*     3.3    27.6    -      -       -      +
    109I  ALA*     3.8    12.1    -      -       +      -
    111I  VAL*     3.3    10.4    -      -       +      +
    143I  ARG      3.0    10.7    +      -       -      +
    144I  LYS      3.9     2.9    -      -       -      +
    146I  ALA*     1.3    75.8    -      -       -      +
    148I  THR*     1.3    60.2    +      -       -      +
    150I  GLY      3.3     1.0    +      -       -      -
    151I  LEU*     2.9    26.2    +      -       +      +
    122J  GLU      4.8     2.2    -      -       -      +
    123J  ASP*     3.6    34.1    -      -       -      +
    124J  VAL*     3.5    16.8    -      -       +      -
    153J  ARG*     4.6     0.7    -      -       -      +
----------------------------------------------------------
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Residues in contact with THR 148 (chain I). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     68I  GLY*     4.4    22.2    -      -       -      -
     72I  ILE*     6.3     2.9    -      -       +      -
    144I  LYS      3.0    12.7    +      -       -      -
    145I  GLU*     4.0     2.2    -      -       -      -
    147I  VAL*     1.3    78.0    -      -       -      +
    149I  ASP*     1.3    58.2    +      -       -      +
    151I  LEU*     3.1    11.5    +      -       +      +
    152I  LYS*     2.9    33.9    +      -       +      +
    123J  ASP*     4.9     0.7    +      -       -      -
    153J  ARG*     3.1    15.9    +      -       -      -
     34L    T      4.8     7.0    -      -       -      +
     35L    T      2.8    37.1    +      -       -      +
----------------------------------------------------------
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Residues in contact with ASP 149 (chain I). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    140H  GLU*     5.2     1.4    -      -       -      +
    144H  LYS*     2.8    34.7    +      -       -      -
    125I  GLY*     3.7     3.1    -      -       -      -
    126I  TYR      3.7    14.8    -      -       -      +
    145I  GLU*     2.9    21.2    +      -       +      +
    146I  ALA      3.9     1.8    -      -       -      +
    148I  THR*     1.3    76.6    -      -       -      +
    150I  GLY*     1.3    59.2    +      -       -      +
    152I  LYS*     3.3    29.7    +      -       -      +
    153I  ARG*     2.9    30.6    +      -       -      +
     32L    T      3.7     7.0    +      -       -      -
     33L    T      3.8    12.6    +      -       -      -
----------------------------------------------------------
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Residues in contact with GLY 150 (chain I). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    111I  VAL*     3.5    20.6    -      -       -      +
    123I  ASP      4.1     2.6    -      -       -      +
    124I  VAL      3.5     9.0    -      -       -      -
    125I  GLY*     3.3    19.6    -      -       -      -
    146I  ALA      2.9    12.7    +      -       -      -
    149I  ASP*     1.3    76.1    -      -       -      +
    151I  LEU*     1.3    57.8    +      -       -      +
    153I  ARG*     3.8     1.2    -      -       -      +
    154I  ALA*     2.9    32.1    +      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 151 (chain I). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     72I  ILE*     4.3    22.7    -      -       +      -
     84I  TRP*     3.8    17.5    -      -       +      -
     86I  HIS*     3.6    46.9    -      -       +      +
    111I  VAL*     3.4     9.9    -      -       +      +
    113I  VAL*     3.7    10.5    -      -       +      -
    147I  VAL*     2.9    15.1    +      -       +      +
    148I  THR*     3.1    14.8    +      -       +      +
    150I  GLY*     1.3    77.0    -      -       -      +
    152I  LYS*     1.3    58.8    +      -       +      +
    154I  ALA*     3.3     0.7    +      -       -      -
    155I  LEU*     2.9    47.0    +      -       +      +
    123J  ASP*     5.8     1.8    -      -       -      +
    157J  SER*     5.0     1.6    -      -       -      +
----------------------------------------------------------
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Residues in contact with LYS 152 (chain I). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     66I  ILE      3.6    18.6    +      -       -      +
     68I  GLY*     4.4    17.5    -      -       -      -
     71I  VAL*     4.3    22.1    -      -       +      +
    148I  THR*     2.9    18.2    +      -       +      +
    149I  ASP*     3.3    30.2    +      -       -      +
    151I  LEU*     1.3    77.9    -      -       +      +
    153I  ARG*     1.3    58.0    +      -       +      +
    155I  LEU*     3.3     5.9    +      -       -      +
    156I  ARG*     3.0    40.7    +      -       +      +
    162I  LEU      4.8     1.2    -      -       -      +
     33L    T      2.6    27.3    +      -       -      -
     34L    T      2.4    34.8    +      -       -      +
----------------------------------------------------------
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Residues in contact with ARG 153 (chain I). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    144H  LYS*     3.6    38.9    +      -       -      +
    147H  VAL*     4.4     1.8    -      -       -      +
    148H  THR*     3.1    22.2    +      -       -      -
    123I  ASP*     2.8    51.8    +      -       -      +
    124I  VAL      3.2    23.7    +      -       -      +
    149I  ASP*     2.9    17.1    +      -       -      +
    150I  GLY      3.9     0.7    -      -       -      +
    152I  LYS*     1.3    77.3    -      -       +      +
    154I  ALA*     1.3    60.0    +      -       -      +
    156I  ARG*     3.5    30.8    -      -       -      +
    157I  SER*     3.8     6.2    +      -       -      -
    167I  LEU*     5.6     0.4    -      -       -      +
     31L    T      2.6    25.6    +      -       -      -
     32L    T      3.2    30.7    +      -       -      +
----------------------------------------------------------
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Residues in contact with ALA 154 (chain I). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     86H  HIS*     5.8     0.2    -      -       -      -
    111I  VAL      3.7    19.3    -      -       -      +
    113I  VAL*     3.6    23.7    -      -       +      +
    121I  HIS*     3.7    29.3    +      -       -      +
    122I  GLU      4.9     0.4    -      -       -      -
    123I  ASP*     3.9    11.6    -      -       -      +
    150I  GLY      2.9    17.8    +      -       -      +
    151I  LEU      3.9     0.7    -      -       -      +
    153I  ARG*     1.3    77.2    -      -       -      +
    155I  LEU*     1.3    63.6    +      -       -      +
    156I  ARG      3.2     0.6    +      -       -      -
    157I  SER*     3.6     9.4    +      -       -      -
    158I  PHE*     4.7     1.7    -      -       -      -
----------------------------------------------------------
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Residues in contact with LEU 155 (chain I). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     71I  VAL*     3.8    31.2    -      -       +      +
     72I  ILE*     5.3     0.7    -      -       +      +
     75I  ALA*     4.1    24.0    -      -       +      -
     79I  PHE*     4.8     2.7    -      -       +      -
     84I  TRP*     4.1    11.7    -      -       +      -
    113I  VAL*     3.7    25.6    -      -       +      -
    151I  LEU*     2.9    45.2    +      -       +      +
    152I  LYS      3.9     2.7    -      -       -      +
    154I  ALA*     1.3    74.7    -      -       -      +
    156I  ARG*     1.3    65.9    +      -       -      +
    157I  SER      3.2     0.4    +      -       -      -
    158I  PHE*     3.4    28.4    +      -       +      +
    162I  LEU*     3.4    24.8    -      -       +      +
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Residues in contact with ARG 156 (chain I). Click here for Legend to table.
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                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
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     72H  ILE*     5.1     3.8    -      -       +      -
     65I  TYR*     6.0     1.4    -      -       -      +
     66I  ILE      6.1     0.2    -      -       -      +
    152I  LYS*     3.0    28.7    +      -       +      +
    153I  ARG*     3.5    26.0    -      -       -      +
    154I  ALA      3.2     0.6    -      -       -      -
    155I  LEU*     1.3    76.3    -      -       -      +
    157I  SER*     1.3    54.0    +      -       -      +
    158I  PHE      2.8    12.0    +      -       -      -
    159I  GLY      3.3    18.4    +      -       -      +
    162I  LEU      3.7     7.8    +      -       -      +
    163I  GLY*     3.5    28.5    +      -       -      +
    164I  ASN*     3.5    15.9    -      -       -      +
    166I  ILE*     3.4    24.7    -      -       -      +
    167I  LEU*     3.4    27.5    -      -       -      +
     32L    T      2.7    51.0    +      -       -      -
     33L    T      4.4     7.1    +      -       -      -
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Residues in contact with SER 157 (chain I). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
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     72H  ILE*     3.9    26.6    -      -       -      +
     76H  ASN*     3.2    19.6    +      -       -      +
     84H  TRP*     3.6     8.8    -      -       -      -
     86H  HIS*     4.0    15.9    +      -       -      -
    151H  LEU*     4.9     0.6    -      -       -      +
    121I  HIS*     3.4    40.2    -      -       -      -
    123I  ASP*     4.7     3.1    +      -       -      -
    153I  ARG      3.8    11.6    +      -       -      -
    154I  ALA      3.6     5.2    +      -       -      -
    155I  LEU      3.2     1.8    -      -       -      -
    156I  ARG*     1.3    72.8    -      -       -      +
    158I  PHE*     1.3    57.5    +      -       -      +
    159I  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
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  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