Contacts of the helix formed by residues 141 - 165 (chain B) in PDB entry 1L8I


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 141 (chain B).
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     21B  VAL*     5.4     5.6    -      -       +      +
     25B  GLU*     4.2    12.7    +      -       +      -
     29B  THR*     3.8    17.3    +      -       -      +
     83B  ARG*     2.6    36.0    +      -       -      -
     87B  LEU*     4.1     9.0    -      -       +      +
    139B  ALA*     3.5     1.1    -      -       -      +
    140B  LYS*     1.3    76.2    -      -       -      +
    142B  ASP*     1.3    69.0    +      -       -      +
    143B  ASP*     3.5     4.3    +      -       -      +
    144B  THR*     2.7    28.5    +      -       -      +
    145B  ALA*     2.9    19.7    +      -       -      +
    133H  ARG*     4.4    11.0    -      -       -      +
----------------------------------------------------------
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Residues in contact with ASP 142 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    140B  LYS      3.3     9.4    +      -       -      +
    141B  ASP*     1.3    73.0    +      -       -      +
    143B  ASP*     1.3    64.3    +      -       -      +
    145B  ALA*     3.0    10.4    +      -       -      +
    146B  ASP*     3.0    20.6    +      -       -      +
    133H  ARG*     4.2     9.7    -      -       +      +
    136H  ILE*     4.1    39.4    -      -       +      +
    137H  GLY*     4.4     9.5    +      -       -      -
    149H  THR*     4.4     5.4    -      -       -      +
----------------------------------------------------------
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Residues in contact with ASP 143 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     83B  ARG*     3.0    39.6    +      -       -      +
    141B  ASP*     3.3     3.0    +      -       -      -
    142B  ASP*     1.3    77.6    -      -       -      +
    144B  THR*     1.3    65.6    +      -       -      +
    146B  ASP*     3.0     6.6    +      -       -      +
    147B  ILE*     3.0    25.5    +      -       -      +
    133H  ARG*     4.2     3.1    -      -       -      -
    136H  ILE*     3.5    15.7    -      -       -      +
    149H  THR*     3.5    26.7    -      -       -      +
    152H  SER*     2.9    21.4    +      -       -      -
    153H  ARG*     3.7    20.8    +      -       -      +
    156H  ASP*     3.6     2.1    -      -       -      +
----------------------------------------------------------
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Residues in contact with THR 144 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     29B  THR*     3.3    22.3    -      -       +      +
     32B  LEU*     5.2     2.7    -      -       +      -
     33B  LEU*     3.4    33.0    -      -       +      -
     83B  ARG*     3.5     9.5    +      -       -      +
    139B  ALA*     4.5     7.6    -      -       +      -
    141B  ASP*     2.7    33.3    +      -       -      -
    143B  ASP*     1.3    79.4    -      -       -      +
    145B  ALA*     1.3    63.6    -      -       -      +
    147B  ILE*     3.2    11.7    +      -       -      +
    148B  LEU*     3.0    33.1    +      -       +      +
----------------------------------------------------------
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Residues in contact with ALA 145 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    136B  ILE*     3.9    23.8    -      -       +      +
    139B  ALA*     4.2    17.9    -      -       -      +
    141B  ASP      2.9    11.3    +      -       -      +
    142B  ASP*     3.3    13.9    -      -       -      +
    144B  THR*     1.3    75.6    -      -       -      +
    146B  ASP*     1.3    51.7    +      -       -      +
    148B  LEU*     3.2     7.9    +      -       -      +
    149B  THR*     2.8    38.0    +      -       -      +
----------------------------------------------------------
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Residues in contact with ASP 146 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    142B  ASP      3.0    10.0    +      -       -      +
    143B  ASP      3.0    10.5    +      -       -      +
    145B  ALA*     1.3    74.6    -      -       -      +
    147B  ILE*     1.3    66.7    +      -       -      +
    149B  THR*     2.8    19.7    +      -       -      -
    150B  ALA*     2.9    13.0    +      -       -      +
    310B  TRS      2.6    47.5    +      -       -      -
    146H  ASP*     4.2     4.5    -      -       -      +
    149H  THR*     3.8    22.0    -      -       +      +
    153H  ARG*     3.1    19.7    +      -       -      +
    146K  ASP*     4.2     5.2    -      -       -      +
----------------------------------------------------------
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Residues in contact with ILE 147 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     33B  LEU*     5.2     1.8    -      -       +      -
     76B  HIS*     4.7     3.6    +      -       -      +
     79B  THR*     4.0    19.5    -      -       +      +
     80B  MET*     3.7    30.3    -      -       +      -
     83B  ARG*     3.6    41.1    -      -       +      -
    143B  ASP      3.0    11.8    +      -       -      +
    144B  THR*     3.4     9.6    -      -       +      +
    146B  ASP*     1.3    76.1    -      -       -      +
    148B  LEU*     1.3    60.4    +      -       +      +
    150B  ALA*     3.5     3.9    +      -       -      +
    151B  ALA*     3.0    26.1    +      -       +      +
    153H  ARG*     3.4    42.4    -      -       +      +
----------------------------------------------------------
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Residues in contact with LEU 148 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     32B  LEU*     4.4     7.6    -      -       +      -
     33B  LEU*     4.6     7.9    -      -       +      -
     36B  GLN*     4.1    18.2    -      -       +      -
     80B  MET*     4.0    25.8    -      -       +      -
    132B  VAL*     4.1    15.0    -      -       +      +
    135B  ALA*     3.7    30.3    -      -       +      +
    136B  ILE*     3.9    14.2    -      -       +      +
    139B  ALA*     4.0    15.3    -      -       +      -
    144B  THR*     3.0    28.8    +      -       +      +
    145B  ALA*     3.4     6.3    -      -       -      +
    147B  ILE*     1.3    72.2    -      -       -      +
    149B  THR*     1.3    61.0    +      -       -      +
    151B  ALA*     3.3     4.2    +      -       -      +
    152B  SER*     2.7    31.7    +      -       -      -
----------------------------------------------------------
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Residues in contact with THR 149 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    136B  ILE*     3.5    22.8    -      -       +      +
    145B  ALA      2.8    21.6    +      -       -      -
    146B  ASP*     2.8    17.6    +      -       -      -
    148B  LEU*     1.3    68.9    -      -       -      +
    150B  ALA*     1.3    60.3    +      -       -      +
    152B  SER      3.2     0.2    +      -       -      -
    153B  ARG*     2.8    33.7    +      -       -      +
    310B  TRS      6.4     0.2    -      -       -      -
    142K  ASP*     4.5     5.2    -      -       +      +
    143K  ASP*     3.6    19.6    -      -       -      +
    146K  ASP*     3.7    37.9    -      -       +      +
----------------------------------------------------------
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Residues in contact with ALA 150 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     76B  HIS*     3.5    18.1    -      -       +      -
    146B  ASP      2.9     9.8    +      -       -      +
    147B  ILE*     3.6    11.0    -      -       -      +
    149B  THR*     1.3    78.5    -      -       -      +
    151B  ALA*     1.3    62.4    -      -       -      +
    153B  ARG*     3.5     8.1    -      -       -      +
    154B  ASP*     3.4    17.0    +      -       -      +
    310B  TRS      4.5    24.0    +      -       -      +
    153H  ARG*     4.9     9.0    -      -       -      +
    146K  ASP*     5.4     0.2    -      -       -      -
----------------------------------------------------------
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Residues in contact with ALA 151 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     40B  PHE*     4.2    16.8    -      -       +      -
     76B  HIS*     3.4    32.3    -      -       +      +
     80B  MET*     5.0     6.3    -      -       +      -
    132B  VAL*     4.7     3.1    -      -       +      -
    147B  ILE*     3.0    18.6    +      -       +      +
    148B  LEU*     3.6     8.5    -      -       -      +
    150B  ALA*     1.3    74.7    -      -       -      +
    152B  SER*     1.3    64.1    +      -       -      +
    154B  ASP*     3.3     4.3    +      -       -      +
    155B  LEU*     3.1    28.2    +      -       -      +
----------------------------------------------------------
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Residues in contact with SER 152 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    132B  VAL*     4.0    21.6    -      -       -      +
    133B  ARG*     3.8    16.3    -      -       -      +
    136B  ILE*     3.7    11.0    -      -       -      -
    148B  LEU      2.7    20.9    +      -       -      -
    151B  ALA*     1.3    68.9    -      -       -      +
    153B  ARG*     1.3    68.8    +      -       -      +
    155B  LEU*     2.9     3.9    +      -       -      +
    156B  ASP*     2.9    29.6    +      -       -      +
    143K  ASP*     2.6    31.2    +      -       -      -
----------------------------------------------------------
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Residues in contact with ARG 153 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    149B  THR      2.8    16.4    +      -       -      +
    150B  ALA*     3.5     9.1    -      -       -      +
    152B  SER*     1.3    77.3    -      -       -      +
    154B  ASP*     1.3    61.3    +      -       -      +
    156B  ASP*     3.7     4.2    +      -       -      +
    157B  LYS*     3.5    18.0    +      -       -      +
    310B  TRS      4.1     9.0    +      -       -      -
     79K  THR*     3.6    20.4    -      -       -      +
     83K  ARG*     5.1     2.9    -      -       -      +
     86K  GLN*     4.6     4.8    +      -       -      +
    143K  ASP*     3.5    27.8    +      -       +      +
    146K  ASP*     3.2    26.3    +      -       -      -
    147K  ILE*     3.5    45.5    -      -       +      +
    150K  ALA*     4.9    10.1    -      -       -      +
----------------------------------------------------------
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Residues in contact with ASP 154 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     72B  ALA*     3.9    10.6    -      -       -      +
     76B  HIS*     2.6    37.1    +      -       +      +
    150B  ALA      3.4     4.6    +      -       -      +
    151B  ALA      3.3     4.4    +      -       -      +
    152B  SER      3.1     0.4    -      -       -      -
    153B  ARG*     1.3    78.6    -      -       -      +
    155B  LEU*     1.3    61.6    +      -       +      +
    157B  LYS*     3.1    12.2    +      -       -      +
    158B  PHE*     2.9    55.4    +      -       +      -
----------------------------------------------------------
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Residues in contact with LEU 155 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     40B  PHE*     3.5    31.0    -      -       +      -
     43B  LEU*     4.1    15.5    -      -       +      -
     73B  LEU*     4.2    15.5    -      -       +      -
     76B  HIS*     5.2     1.6    -      -       +      -
    125B  TYR*     4.3     9.3    -      -       +      +
    128B  VAL*     3.6    32.3    -      -       +      -
    129B  ALA*     3.8    25.1    -      -       +      +
    132B  VAL*     4.9     1.3    -      -       +      -
    151B  ALA      3.1    26.3    +      -       -      +
    152B  SER*     2.9     9.0    +      -       -      +
    154B  ASP*     1.3    76.4    -      -       +      +
    156B  ASP*     1.3    62.6    +      -       -      +
    158B  PHE*     3.1     7.1    +      -       +      +
    159B  LEU*     2.8    31.8    +      -       -      +
----------------------------------------------------------
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Residues in contact with ASP 156 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    129B  ALA*     3.8    12.8    -      -       -      +
    133B  ARG*     2.6    35.3    +      -       -      -
    152B  SER*     2.9    18.0    +      -       -      +
    153B  ARG      4.1     1.3    -      -       -      +
    155B  LEU*     1.3    76.5    -      -       -      +
    157B  LYS*     1.3    60.7    +      -       -      +
    159B  LEU*     3.8     6.6    -      -       -      +
    160B  TRP*     3.2    22.2    +      -       -      +
     19K  ASN*     3.3    19.7    +      -       -      +
     83K  ARG*     2.7    42.6    +      -       -      +
     86K  GLN*     3.9     9.6    -      -       -      +
    143K  ASP*     3.5     2.6    -      -       -      +
----------------------------------------------------------
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Residues in contact with LYS 157 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    153B  ARG      3.5    10.0    +      -       -      +
    154B  ASP*     3.1    16.0    +      -       -      +
    155B  LEU      3.0     0.6    -      -       -      -
    156B  ASP*     1.3    77.2    -      -       -      +
    158B  PHE*     1.3    74.7    +      -       +      +
    160B  TRP*     3.2    13.4    +      -       +      +
    161B  PHE*     2.9    54.6    +      -       +      +
     82K  GLU*     4.2    20.3    +      -       -      +
     86K  GLN*     3.6    23.0    -      -       -      +
----------------------------------------------------------
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Residues in contact with PHE 158 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     68B  GLY      5.1     0.9    -      -       -      -
     69B  PHE*     3.4    61.0    -      +       +      -
     72B  ALA*     3.6    29.2    -      -       +      -
     73B  LEU*     3.9    19.3    -      -       +      -
    125B  TYR*     3.9    18.4    -      +       +      -
    154B  ASP*     2.9    47.0    +      -       +      -
    155B  LEU*     3.5     8.7    -      -       -      +
    157B  LYS*     1.3    87.9    -      -       +      +
    159B  LEU*     1.3    66.7    +      -       -      +
    161B  PHE*     3.0     2.9    +      -       -      +
    162B  ILE*     2.8    29.8    +      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 159 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    122B  ALA*     3.5    29.2    -      -       -      +
    125B  TYR*     4.3     7.7    -      -       +      -
    126B  ALA*     4.1    23.8    -      -       +      +
    129B  ALA*     4.3    12.3    -      -       +      -
    155B  LEU      2.8    19.9    +      -       -      +
    156B  ASP*     3.8     5.4    -      -       -      +
    158B  PHE*     1.3    72.5    -      -       -      +
    160B  TRP*     1.3    57.5    +      -       -      +
    162B  ILE*     3.6     6.4    -      -       -      +
    163B  GLU*     2.8    57.3    +      -       +      +
     17K  THR*     4.4     2.9    -      -       -      +
     18K  ARG      4.2     0.7    -      -       -      -
     19K  ASN*     3.9    40.6    -      -       +      +
----------------------------------------------------------
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Residues in contact with TRP 160 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    156B  ASP      3.2    12.5    +      -       -      +
    157B  LYS*     3.4    11.7    -      -       +      +
    158B  PHE      3.2     0.4    -      -       -      -
    159B  LEU*     1.3    81.2    -      -       -      +
    161B  PHE*     1.3    85.9    +      +       -      +
    163B  GLU*     3.9     7.7    -      -       -      +
    164B  SER*     2.8    51.8    +      -       -      -
     17K  THR*     5.8     1.6    -      -       -      -
     82K  GLU*     3.8    42.2    -      -       +      -
     85K  VAL*     3.5    23.3    -      -       +      +
     86K  GLN*     3.6    33.7    -      -       +      +
     52L  TRP*     3.8    21.7    +      -       -      -
     54L  MET      5.0     2.2    +      -       -      -
     55L  ARG*     4.3    16.6    -      -       -      +
     59L  PHE*     4.2    15.3    -      +       -      -
     63L  HIS*     3.9    12.1    -      -       -      -
----------------------------------------------------------
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Residues in contact with PHE 161 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     65B  MET*     3.9    11.9    -      -       +      -
     69B  PHE*     3.8    22.9    -      +       +      -
    157B  LYS*     2.9    36.2    +      -       +      +
    158B  PHE      3.0     6.5    +      -       -      +
    160B  TRP*     1.3   111.6    -      +       -      +
    162B  ILE*     1.3    68.0    +      -       -      +
    164B  SER*     3.4     8.1    +      -       -      -
    165B  ASN*     2.9    22.7    +      -       -      +
     82K  GLU*     5.6     0.7    -      -       -      -
     59L  PHE*     3.7    16.5    -      +       -      -
     60L  ILE*     3.4    26.9    -      -       +      -
     63L  HIS*     3.8    22.7    -      +       -      -
     64L  GLU*     4.7     4.9    -      -       +      -
----------------------------------------------------------
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Residues in contact with ILE 162 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     65B  MET*     4.5     9.4    -      -       +      -
     66B  LEU*     5.0     4.7    -      -       +      -
     69B  PHE*     3.7    17.0    -      -       +      -
    118B  LEU*     3.5    39.4    -      -       +      +
    121B  LEU*     4.4     7.9    -      -       +      -
    122B  ALA*     3.9    12.3    -      -       +      +
    125B  TYR*     3.5    52.3    -      -       +      -
    158B  PHE      2.8    19.4    +      -       -      +
    159B  LEU*     3.6     6.3    -      -       -      +
    161B  PHE*     1.3    76.1    -      -       -      +
    163B  GLU*     1.3    63.3    +      -       -      +
    165B  ASN*     3.0    17.5    +      -       -      +
    166B  ILE*     3.6     8.7    -      -       -      +
----------------------------------------------------------
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Residues in contact with GLU 163 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    122B  ALA*     4.3     4.0    -      -       +      -
    159B  LEU*     2.8    35.7    +      -       +      +
    160B  TRP*     3.9     7.2    -      -       -      +
    162B  ILE*     1.3    73.3    -      -       -      +
    164B  SER*     1.3    62.0    +      -       -      +
    166B  ILE*     3.1    30.7    +      -       +      +
     16K  TYR*     4.0     4.8    -      -       -      +
     17K  THR*     3.0    29.7    +      -       -      -
     18K  ARG*     2.7    61.0    +      -       -      +
     55L  ARG*     4.9    11.1    +      -       -      +
----------------------------------------------------------
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Residues in contact with SER 164 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    160B  TRP*     2.8    42.2    +      -       -      -
    161B  PHE      3.9     0.4    -      -       -      -
    162B  ILE      3.2     0.6    -      -       -      -
    163B  GLU*     1.3    75.6    -      -       -      +
    165B  ASN*     1.3    57.3    +      -       -      +
    166B  ILE      3.3     1.1    -      -       -      -
     54L  MET      4.3     0.2    +      -       -      -
     55L  ARG*     3.6    23.3    +      -       -      +
     56L  GLY      2.8    33.5    +      -       -      +
     59L  PHE*     3.1    35.5    -      -       -      +
----------------------------------------------------------
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Residues in contact with ASN 165 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     58B  ASN*     3.1    28.7    +      -       -      +
     62B  VAL*     4.4     7.6    -      -       +      -
     65B  MET*     3.7    15.0    -      -       -      +
    115B  GLN*     2.8    25.3    +      -       -      -
    118B  LEU*     3.4    21.3    -      -       +      +
    161B  PHE      2.9    18.1    +      -       -      +
    162B  ILE      3.0     7.0    +      -       -      +
    164B  SER*     1.3    76.2    -      -       -      +
    166B  ILE*     1.3    54.7    +      -       -      +
    167B  GLU      3.6     0.2    +      -       -      -
     56L  GLY      3.8     8.9    -      -       -      +
     57L  ALA*     4.5     4.0    -      -       -      -
     59L  PHE*     3.4    13.9    -      -       -      +
     60L  ILE*     3.2    33.6    -      -       -      +
----------------------------------------------------------
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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