Contacts of the helix formed by residues 182 - 206 (chain F) in PDB entry 4XLN


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 PRO 182 (chain F).
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    406D  ASP*     4.4     2.5    -      -       -      +
    180F  SER      4.4     2.7    -      -       -      +
    181F  LEU*     1.3    90.5    -      -       +      +
    183F  LYS*     1.3    56.5    +      -       +      +
    184F  GLU*     3.6     3.4    -      -       +      +
    185F  LEU*     3.3    23.4    +      -       +      +
    186F  LYS*     2.7    35.6    +      -       -      +
----------------------------------------------------------
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Residues in contact with LYS 183 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    403D  PHE*     4.2    16.8    -      -       -      -
    404D  GLU      5.1     3.2    +      -       -      -
    406D  ASP*     4.2    34.2    +      -       +      +
    439D  LEU*     3.5    30.2    -      -       -      +
    442D  ASN*     4.8     5.3    -      -       -      +
    182F  PRO*     1.3    75.2    -      -       -      +
    184F  GLU*     1.3    78.8    +      -       +      +
    185F  LEU      3.0     0.2    +      -       -      -
    186F  LYS      3.8     0.3    -      -       -      -
    187F  ARG*     3.0    40.4    +      -       +      +
----------------------------------------------------------
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Residues in contact with GLU 184 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    182F  PRO*     3.6     3.6    -      -       +      +
    183F  LYS*     1.3    90.4    -      -       +      +
    185F  LEU*     1.3    62.7    +      -       +      +
    187F  ARG*     3.3    20.9    +      -       -      +
    188F  TYR*     3.0    32.3    -      -       +      -
----------------------------------------------------------
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Residues in contact with LEU 185 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    130F  LYS*     5.4     4.7    -      -       +      +
    131F  LEU*     3.6    13.4    -      -       +      +
    134F  ALA*     4.0    25.4    -      -       +      +
    181F  LEU*     3.6    30.3    -      -       +      -
    182F  PRO*     3.3    29.9    +      -       +      +
    183F  LYS      3.1     0.6    -      -       -      -
    184F  GLU*     1.3    77.4    -      -       +      +
    186F  LYS*     1.3    67.3    +      -       -      +
    187F  ARG      3.0     3.3    +      -       -      -
    188F  TYR*     3.0    25.9    +      -       +      +
----------------------------------------------------------
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Residues in contact with LYS 186 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    406D  ASP*     3.7    32.0    +      -       -      +
    407D  VAL      4.6     5.1    +      -       -      +
    131F  LEU*     5.6     0.4    -      -       -      -
    178F  LEU      3.7    21.1    -      -       -      +
    179F  LYS*     3.6    46.2    +      -       +      +
    181F  LEU*     3.2    22.7    +      -       -      +
    182F  PRO      2.7    20.8    +      -       -      +
    183F  LYS      4.0     0.9    -      -       -      +
    185F  LEU*     1.3    72.5    -      -       -      +
    187F  ARG*     1.3    59.3    +      -       -      +
    188F  TYR      3.4     0.2    -      -       -      -
    189F  LEU*     3.3    38.2    -      -       +      +
    190F  HIS*     3.3    13.0    +      -       +      -
----------------------------------------------------------
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Residues in contact with ARG 187 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    439D  LEU*     3.5    40.7    -      -       +      +
    183F  LYS*     3.0    29.9    +      -       +      +
    184F  GLU*     3.3    34.8    +      -       -      +
    185F  LEU      3.0     0.2    +      -       -      -
    186F  LYS*     1.3    73.3    -      -       -      +
    188F  TYR*     1.3    79.7    +      -       +      +
    189F  LEU      3.0     5.6    -      -       -      -
    190F  HIS*     3.0    12.3    +      -       -      +
    191F  ILE*     3.0    50.2    +      -       -      +
----------------------------------------------------------
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Residues in contact with TYR 188 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    123F  GLU      5.8     0.2    -      -       -      -
    126F  GLU      5.3     0.4    -      -       -      -
    127F  ALA*     3.4    37.2    -      -       +      +
    130F  LYS*     3.4    43.2    +      -       +      +
    131F  LEU*     3.5    20.6    -      -       +      +
    184F  GLU*     3.0    30.1    -      -       +      -
    185F  LEU*     3.0    15.7    +      -       +      +
    187F  ARG*     1.3    96.6    +      -       +      +
    189F  LEU*     1.3    57.0    +      -       -      +
    191F  ILE*     3.8    18.6    -      -       +      -
    192F  ALA*     2.9    27.9    +      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 189 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    410D  THR*     4.0    13.7    -      -       +      -
    131F  LEU*     3.6    18.2    -      -       +      +
    146F  VAL*     5.3     9.4    -      -       +      +
    178F  LEU*     5.7     1.1    -      -       +      +
    179F  LYS*     6.4     0.2    -      -       +      -
    185F  LEU      3.9     1.2    +      -       -      +
    186F  LYS*     3.3    31.1    +      -       +      +
    188F  TYR*     1.3    75.7    -      -       -      +
    190F  HIS*     1.3    82.7    +      -       +      +
    192F  ALA*     3.1     4.8    +      -       -      +
    193F  ARG*     3.0    59.4    +      -       -      +
----------------------------------------------------------
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Residues in contact with HIS 190 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    406D  ASP*     5.2     0.9    -      -       -      -
    407D  VAL*     4.1    11.2    -      -       +      +
    409D  VAL      3.5    20.6    +      -       -      -
    410D  THR*     3.9    11.8    -      -       +      -
    411D  THR*     4.3    12.3    -      -       +      +
    437D  VAL*     3.6    34.7    -      -       +      +
    439D  LEU*     4.7    13.2    -      -       +      +
    186F  LYS*     3.3    21.5    +      -       +      -
    187F  ARG*     3.0    10.8    +      -       -      +
    189F  LEU*     1.3    94.4    -      -       +      +
    191F  ILE*     1.3    65.3    +      -       -      +
    193F  ARG*     3.2    11.3    -      -       -      +
    194F  GLU*     2.9    35.2    +      -       -      +
----------------------------------------------------------
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Residues in contact with ILE 191 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    439D  LEU*     4.6     5.6    -      -       +      -
    120F  LYS*     4.6     1.3    -      -       -      +
    123F  GLU*     3.8    38.8    -      -       +      +
    124F  GLY*     3.6     3.5    +      -       -      +
    127F  ALA*     3.9     2.9    -      -       +      -
    187F  ARG*     3.0    43.4    +      -       -      +
    188F  TYR*     3.6    35.9    -      -       +      +
    190F  HIS*     1.3    76.0    -      -       -      +
    192F  ALA*     1.3    63.6    +      -       -      +
    194F  GLU*     3.3    10.9    +      -       +      +
    195F  GLY      3.0    18.0    +      -       -      -
----------------------------------------------------------
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Residues in contact with ALA 192 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    124F  GLY*     3.7    16.2    -      -       -      +
    127F  ALA*     4.1     1.3    -      -       +      +
    128F  ILE*     3.8    28.4    -      -       +      +
    131F  LEU*     4.5     5.2    -      -       +      -
    146F  VAL*     4.5    10.1    -      -       +      -
    188F  TYR      2.9    16.0    +      -       -      +
    189F  LEU*     3.2    11.9    -      -       -      +
    191F  ILE*     1.3    76.0    -      -       -      +
    193F  ARG*     1.3    64.2    +      -       -      +
    195F  GLY*     3.0     5.2    +      -       -      -
    196F  GLU*     2.9    24.9    +      -       -      +
----------------------------------------------------------
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Residues in contact with ARG 193 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    410D  THR*     4.1    19.4    -      -       -      +
    411D  THR*     3.2    37.8    +      -       +      +
    146F  VAL*     3.6    28.6    +      -       +      +
    149F  LYS*     3.5    36.3    +      -       -      +
    150F  ILE*     3.3    40.0    -      -       +      +
    189F  LEU*     3.0    45.8    +      -       -      +
    190F  HIS*     3.2    22.9    -      -       -      +
    192F  ALA*     1.3    73.4    -      -       -      +
    194F  GLU*     1.3    61.8    +      -       -      +
    196F  GLU*     3.1     3.5    +      -       -      +
    197F  ALA*     2.9    22.7    +      -       -      +
----------------------------------------------------------
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Residues in contact with GLU 194 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    411D  THR*     5.3     4.5    -      -       -      +
    437D  VAL      4.6    11.6    -      -       -      +
    438D  ASP*     5.3     6.9    -      -       -      +
    439D  LEU      5.8     0.9    +      -       -      -
    440D  VAL*     6.1     0.7    -      -       -      +
    120F  LYS*     3.8    30.5    +      -       +      +
    190F  HIS*     2.9    26.1    +      -       -      +
    191F  ILE*     3.3     9.2    -      -       -      +
    193F  ARG*     1.3    78.6    -      -       +      +
    195F  GLY*     1.3    62.7    +      -       -      +
    197F  ALA*     3.2     8.9    +      -       -      +
    198F  ALA*     3.0    21.3    +      -       -      +
----------------------------------------------------------
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Residues in contact with GLY 195 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    120F  LYS*     3.2    32.2    +      -       -      -
    121F  VAL*     3.6    13.4    -      -       -      +
    124F  GLY*     4.3     4.0    -      -       -      -
    191F  ILE      3.0    12.6    +      -       -      -
    192F  ALA      3.0     3.8    +      -       -      -
    194F  GLU*     1.3    74.8    -      -       -      +
    196F  GLU*     1.3    57.1    +      -       -      +
    198F  ALA*     3.1     3.6    +      -       -      +
    199F  ARG*     2.9    26.0    +      -       -      +
----------------------------------------------------------
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Residues in contact with GLU 196 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    128F  ILE*     5.1     3.8    -      -       +      -
    143F  ARG*     2.9    48.5    +      -       -      +
    146F  VAL*     3.6    21.2    -      -       +      +
    147F  ARG*     3.2    22.5    +      -       +      +
    150F  ILE*     5.5     7.0    -      -       +      -
    192F  ALA      2.9    13.6    +      -       -      +
    193F  ARG*     3.1    13.0    +      -       -      +
    195F  GLY*     1.3    76.4    -      -       -      +
    197F  ALA*     1.3    61.9    +      -       -      +
    199F  ARG*     3.1    35.5    +      -       -      +
    200F  GLN*     3.2    27.3    +      -       -      +
----------------------------------------------------------
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Residues in contact with ALA 197 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    150F  ILE*     5.3    13.1    -      -       +      +
    193F  ARG      2.9    12.2    +      -       -      +
    194F  GLU*     3.2    10.1    +      -       +      +
    196F  GLU*     1.3    72.6    -      -       -      +
    198F  ALA*     1.3    66.4    +      -       -      +
    200F  GLN*     3.1    12.8    +      -       -      +
    201F  HIS*     3.0    34.2    +      -       +      +
----------------------------------------------------------
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Residues in contact with ALA 198 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    117F  LEU*     3.6    22.0    -      -       +      +
    120F  LYS*     3.7    29.6    -      -       +      +
    121F  VAL*     3.7    15.6    -      -       +      +
    194F  GLU      3.0    14.3    +      -       -      +
    195F  GLY      3.3     9.6    -      -       -      +
    197F  ALA*     1.3    76.3    -      -       -      +
    199F  ARG*     1.3    56.0    +      -       -      +
    201F  HIS*     3.4     3.3    +      -       -      -
    202F  LEU*     2.9    28.9    +      -       -      +
----------------------------------------------------------
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Residues in contact with ARG 199 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    560D  GLN*     4.4     9.7    +      -       -      -
    561D  GLY      4.4     8.9    +      -       -      -
    562D  ALA*     5.4     1.6    -      -       -      +
    121F  VAL*     3.6    17.2    -      -       +      +
    143F  ARG*     3.7    15.3    -      -       -      +
    147F  ARG*     3.2    36.1    -      -       -      +
    195F  GLY      2.9    11.8    +      -       -      +
    196F  GLU*     3.1    34.1    +      -       -      +
    198F  ALA*     1.3    77.0    -      -       -      +
    200F  GLN*     1.3    75.8    +      -       -      +
    202F  LEU*     3.2     7.0    +      -       -      +
    203F  ILE*     2.9    39.4    +      -       +      +
    236F  ILE*     4.0    18.0    -      -       -      +
    239F  VAL*     4.1    16.4    -      -       +      -
    240F  GLU*     3.2    32.5    +      -       -      +
----------------------------------------------------------
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Residues in contact with GLN 200 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    561D  GLY      3.8     8.5    +      -       -      +
    562D  ALA      3.7     2.8    -      -       -      -
    563D  PRO*     3.2    37.4    -      -       +      +
    147F  ARG*     5.7     2.2    -      -       -      +
    150F  ILE*     6.0     4.9    -      -       +      -
    151F  LEU*     6.0     6.9    -      -       +      +
    196F  GLU*     3.2    24.9    +      -       -      +
    197F  ALA*     3.4    10.1    -      -       -      +
    199F  ARG*     1.3   105.4    -      -       -      +
    201F  HIS*     1.3    67.8    +      -       +      +
    203F  ILE*     3.2     6.5    +      -       -      +
    204F  GLU*     2.9    42.8    +      -       -      +
----------------------------------------------------------
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Residues in contact with HIS 201 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    106F  VAL*     5.6     1.4    -      -       -      +
    117F  LEU*     4.0    21.2    -      -       +      +
    120F  LYS*     6.2     0.2    +      -       -      -
    197F  ALA*     3.0    23.2    +      -       +      +
    198F  ALA*     3.7     8.7    -      -       -      +
    200F  GLN*     1.3    76.9    -      -       +      +
    202F  LEU*     1.3    57.4    +      -       -      +
    204F  GLU*     3.9    19.5    -      -       -      +
    205F  ALA*     2.9    32.1    +      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 202 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    109F  LEU*     5.0     2.5    -      -       +      -
    114F  GLU*     5.2     5.2    -      -       +      +
    117F  LEU*     3.9    18.4    -      -       +      +
    118F  ALA*     4.2    31.6    -      -       +      +
    121F  VAL*     4.6     8.1    -      -       +      -
    198F  ALA      2.9    12.5    +      -       -      +
    199F  ARG*     3.3     9.4    -      -       -      +
    200F  GLN      3.2     0.2    -      -       -      -
    201F  HIS*     1.3    77.0    -      -       -      +
    203F  ILE*     1.3    62.7    +      -       -      +
    205F  ALA*     3.3     1.7    +      -       -      +
    206F  ASN*     2.9    47.2    +      -       -      +
    239F  VAL*     3.8    24.9    -      -       +      +
    242F  PHE*     5.5     6.5    -      -       +      -
    250F  PHE*     3.6    26.9    -      -       +      -
----------------------------------------------------------
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Residues in contact with ILE 203 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    563D  PRO*     3.9    31.4    -      -       +      -
    566D  ILE*     4.2    15.7    -      -       +      -
    199F  ARG*     2.9    33.1    +      -       +      +
    200F  GLN*     3.7     6.1    -      -       -      +
    202F  LEU*     1.3    75.2    -      -       -      +
    204F  GLU*     1.3    63.6    +      -       -      +
    207F  LEU*     3.1    19.6    +      -       +      +
    235F  LEU*     3.3    27.2    -      -       +      +
    236F  ILE*     3.8    39.9    -      -       +      -
    239F  VAL*     3.6    20.4    -      -       +      -
----------------------------------------------------------
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Residues in contact with GLU 204 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    563D  PRO*     3.6    19.0    -      -       +      +
    564D  GLU      5.0     0.5    +      -       -      -
    565D  ILE*     3.6    33.0    -      -       +      +
    103F  ILE*     5.5     2.6    -      -       -      +
    106F  VAL*     4.6    28.8    -      -       +      +
    200F  GLN*     2.9    39.5    +      -       -      +
    201F  HIS*     3.9    17.0    +      -       -      +
    203F  ILE*     1.3    76.2    -      -       -      +
    205F  ALA*     1.3    62.4    +      -       -      +
    207F  LEU*     3.3    26.5    +      -       +      +
    208F  ARG*     4.6     4.7    +      -       -      +
----------------------------------------------------------
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Residues in contact with ALA 205 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    106F  VAL*     4.6     6.7    -      -       +      +
    107F  PRO      4.4    15.7    -      -       -      +
    108F  LEU*     3.6    16.5    -      -       -      +
    109F  LEU*     3.7    34.3    -      -       +      -
    117F  LEU*     5.2     1.3    -      -       +      -
    201F  HIS      2.9    19.5    +      -       -      +
    202F  LEU      3.7     4.0    -      -       -      +
    203F  ILE      3.3     0.2    -      -       -      -
    204F  GLU*     1.3    77.1    -      -       -      +
    206F  ASN*     1.3    59.6    +      -       -      +
    207F  LEU      3.4     0.6    +      -       -      -
    208F  ARG*     3.9     7.6    -      -       -      -
     30O    T      3.5     9.7    -      -       -      +
----------------------------------------------------------
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Residues in contact with ASN 206 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    109F  LEU*     3.6    19.5    -      -       -      +
    114F  GLU*     4.4     1.8    +      -       -      +
    202F  LEU*     2.9    42.7    +      -       -      +
    203F  ILE      3.8     3.1    -      -       -      +
    204F  GLU      3.3     0.2    -      -       -      -
    205F  ALA*     1.3    75.4    -      -       -      +
    207F  LEU*     1.3    64.2    +      -       -      +
    208F  ARG      3.1     2.5    -      -       -      -
    209F  LEU*     3.0    23.5    +      -       +      +
    210F  VAL*     3.5     8.0    +      -       -      +
    235F  LEU*     4.1     8.2    -      -       +      +
    250F  PHE*     3.5    27.8    -      -       +      -
    251F  SER*     5.0     1.9    +      -       -      -
     30O    T      2.8    37.8    +      -       -      +
----------------------------------------------------------
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A short description of the analytical approach
The contact analysis used in this page is based upon the approach developed in: Sobolev V., Wade R.C., Vriend G. and Edelman M. PROTEINS (1996) 25, 120-129. Contact legitimacy depends on the hydrophobic-hydrophilic properties of the contacting atoms. In order to define it, for each inter-atomic contact, eight atom classes have been introduced:


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

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

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