Contacts of the helix formed by residues 208 - 233 (chain B) in PDB entry 4QI1


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 GLY 208 (chain B).
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     14B  GLU*     3.7     8.7    -      -       -      -
    201B  THR*     3.6    11.2    -      -       -      -
    207B  THR*     1.3    80.6    +      -       -      +
    209B  LEU*     1.3    66.8    +      -       -      -
    210B  TYR      3.3     3.3    +      -       -      -
    211B  GLY      3.3     3.0    +      -       -      +
    212B  GLU*     3.1    21.5    +      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 209 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     13B  VAL*     3.9    13.7    -      -       +      -
     14B  GLU*     3.2    17.2    +      -       +      +
     16B  GLU*     3.7    32.8    -      -       -      +
     85B  ASP*     3.8    42.4    -      -       +      +
     87B  TYR*     4.1    15.3    -      -       +      -
    201B  THR*     3.4    11.5    -      -       +      +
    208B  GLY*     1.3    72.2    -      -       -      -
    210B  TYR*     1.3    54.8    +      -       -      +
    212B  GLU*     4.0    21.5    -      -       -      +
    213B  THR*     2.7    48.6    +      -       -      +
----------------------------------------------------------
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Residues in contact with TYR 210 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     14B  GLU*     2.9    31.3    +      -       -      +
     15B  GLY*     3.4    36.8    -      -       -      -
     16B  GLU*     3.9     8.7    -      -       -      -
     18B  ILE*     4.0     7.1    -      -       +      +
     19B  TRP*     3.2    50.4    +      +       -      -
    209B  LEU*     1.3    72.8    -      -       -      +
    211B  GLY*     1.4    66.0    +      -       -      +
    213B  THR      3.4     0.2    +      -       -      -
    214B  LEU*     3.1    22.2    +      -       +      +
----------------------------------------------------------
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Residues in contact with GLY 211 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    207B  THR*     3.5    22.1    +      -       -      -
    208B  GLY      3.3     4.6    +      -       -      +
    210B  TYR*     1.4    79.4    -      -       -      +
    212B  GLU*     1.3    59.6    +      -       -      +
    214B  LEU*     3.3    12.0    +      -       -      +
    215B  LEU*     2.9    29.3    +      -       -      +
----------------------------------------------------------
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Residues in contact with GLU 212 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     85B  ASP      5.4     0.5    -      -       -      +
     90B  ARG*     5.7     1.2    +      -       -      -
    196B  ALA*     4.7     2.7    -      -       -      +
    197B  TRP*     5.9     1.6    -      -       -      -
    199B  VAL*     6.4     0.2    -      -       -      -
    200B  GLY*     4.2    16.4    -      -       -      -
    201B  THR*     2.5    44.5    +      -       -      +
    202B  GLU*     4.0    19.2    -      -       -      +
    207B  THR*     3.9     5.9    -      -       +      +
    208B  GLY      3.1    13.2    +      -       -      +
    209B  LEU*     3.8    15.8    -      -       -      +
    211B  GLY*     1.3    75.4    -      -       -      +
    213B  THR*     1.3    59.0    +      -       -      +
    215B  LEU*     3.3     8.7    +      -       -      +
    216B  PHE*     3.0    60.8    +      -       +      -
----------------------------------------------------------
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Residues in contact with THR 213 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     16B  GLU*     3.6    30.8    -      -       +      +
     19B  TRP*     4.0     8.3    -      -       +      -
     20B  LEU*     3.8    22.0    -      -       +      -
     64B  TYR*     5.7     0.2    -      -       +      -
     87B  TYR*     4.7     3.4    -      -       +      -
     90B  ARG*     3.5    25.8    +      -       -      +
    209B  LEU*     2.7    35.2    +      -       -      +
    210B  TYR      3.8     3.6    -      -       -      -
    212B  GLU*     1.3    75.5    -      -       -      +
    214B  LEU*     1.3    63.0    +      -       -      +
    216B  PHE*     3.5     1.6    +      -       -      +
    217B  MET*     3.0    24.2    +      -       +      +
----------------------------------------------------------
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Residues in contact with LEU 214 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     19B  TRP*     3.6    55.7    -      -       +      +
    210B  TYR*     3.1    16.8    +      -       +      +
    211B  GLY*     3.5    13.5    -      -       -      +
    213B  THR*     1.3    75.8    -      -       -      +
    215B  LEU*     1.3    64.2    +      -       -      +
    217B  MET*     3.3     6.5    +      -       +      +
    218B  VAL*     3.1    38.2    +      -       +      +
----------------------------------------------------------
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Residues in contact with LEU 215 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    192B  ILE*     4.6    12.1    -      -       +      -
    195B  VAL*     6.1     1.3    -      -       +      -
    196B  ALA*     3.4    38.1    -      -       +      +
    199B  VAL*     4.8    10.5    -      -       +      -
    211B  GLY      2.9    17.1    +      -       -      +
    212B  GLU*     3.3     6.7    +      -       -      +
    214B  LEU*     1.3    78.6    -      -       -      +
    216B  PHE*     1.3    58.3    +      -       -      +
    218B  VAL*     3.4     9.3    +      -       +      +
    219B  LEU*     3.0    42.4    +      -       +      +
----------------------------------------------------------
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Residues in contact with PHE 216 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     64B  TYR*     3.6     1.8    -      -       -      -
     90B  ARG*     3.7    37.9    -      -       -      +
     91B  TYR*     6.0     0.4    -      -       -      -
     94B  TRP*     3.8    17.9    -      +       -      -
    193B  TYR*     3.7    39.0    -      +       -      -
    196B  ALA*     3.9    26.5    -      -       +      -
    197B  TRP*     4.1    20.6    -      +       +      -
    212B  GLU*     3.0    54.2    +      -       +      +
    213B  THR      4.1     0.9    -      -       -      +
    215B  LEU*     1.3    72.3    -      -       -      +
    217B  MET*     1.3    60.8    +      -       -      +
    219B  LEU*     4.4     5.6    -      -       +      -
    220B  ASP*     2.8    37.4    +      -       -      +
    301B  RET      4.7     2.5    -      -       +      -
----------------------------------------------------------
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Residues in contact with MET 217 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     19B  TRP*     3.4    44.4    -      -       +      +
     22B  LEU*     4.0    14.8    -      -       +      -
     23B  GLY*     3.8    23.3    -      -       -      -
     64B  TYR*     3.4    14.7    +      -       +      +
    213B  THR      3.0    18.6    +      -       -      +
    214B  LEU*     3.5    15.7    -      -       +      +
    215B  LEU      3.2     0.2    -      -       -      -
    216B  PHE*     1.3    76.3    -      -       -      +
    218B  VAL*     1.3    77.8    +      -       +      +
    220B  ASP*     3.8     1.4    -      -       -      +
    221B  LEU*     3.0    53.9    +      -       +      +
----------------------------------------------------------
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Residues in contact with VAL 218 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    214B  LEU*     3.1    24.0    +      -       +      +
    215B  LEU*     3.7    11.9    -      -       +      +
    217B  MET*     1.3    90.3    -      -       +      +
    219B  LEU*     1.3    70.7    +      -       +      +
    221B  LEU*     3.3     6.0    +      -       -      +
    222B  VAL*     3.0    35.0    +      -       +      +
----------------------------------------------------------
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Residues in contact with LEU 219 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    189B  THR*     3.8    26.5    -      -       +      +
    192B  ILE*     3.9    36.8    -      -       +      -
    193B  TYR*     3.3    46.2    -      -       +      +
    196B  ALA*     4.4     4.7    -      -       +      -
    215B  LEU*     3.0    37.0    +      -       +      +
    216B  PHE*     3.9     4.0    -      -       +      +
    218B  VAL*     1.3    79.1    -      -       +      +
    220B  ASP*     1.3    58.1    +      -       -      +
    222B  VAL*     3.3     7.3    +      -       +      +
    223B  ALA*     2.8    32.1    +      -       -      +
----------------------------------------------------------
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Residues in contact with ASP 220 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     27B  MET*     3.5    16.9    -      -       +      +
     64B  TYR*     2.6    32.8    +      -       +      +
     90B  ARG*     3.8     7.6    +      -       -      -
     93B  ASP*     4.9     1.1    -      -       -      +
     94B  TRP*     3.4    18.1    +      -       -      -
    193B  TYR*     2.7    36.2    +      -       -      -
    216B  PHE*     2.8    23.2    +      -       -      +
    217B  MET      3.8     3.4    -      -       -      +
    219B  LEU*     1.3    75.2    -      -       -      +
    221B  LEU*     1.3    55.9    +      -       -      +
    223B  ALA*     4.5     0.9    -      -       -      -
    224B  LYS*     2.9    47.7    +      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 221 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     22B  LEU      5.0     3.4    -      -       -      +
     23B  GLY*     4.1     8.3    -      -       -      +
     26B  GLY*     3.8    12.6    -      -       -      -
     27B  MET*     3.8    41.3    -      -       +      +
    217B  MET*     3.0    50.6    +      -       +      +
    218B  VAL*     3.8     5.4    -      -       -      +
    220B  ASP*     1.3    74.6    -      -       -      +
    222B  VAL*     1.3    60.1    +      -       +      +
    225B  VAL*     2.9    36.0    +      -       +      +
    226B  GLY      3.1     6.6    +      -       -      -
----------------------------------------------------------
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Residues in contact with VAL 222 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    185B  ILE*     4.2    10.9    -      -       +      +
    189B  THR*     3.6    25.6    -      -       +      -
    218B  VAL*     3.0    28.9    +      -       +      +
    219B  LEU*     3.7     5.4    -      -       +      +
    221B  LEU*     1.3    77.3    -      -       +      +
    223B  ALA*     1.3    56.3    +      -       -      +
    224B  LYS      3.2     0.2    +      -       -      -
    226B  GLY*     3.3     8.7    +      -       -      +
    227B  PHE*     3.0    28.1    +      -       -      +
----------------------------------------------------------
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Residues in contact with ALA 223 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    101B  LEU*     3.4    15.9    -      -       -      +
    185B  ILE*     4.7     3.6    -      -       -      -
    189B  THR*     3.9    19.3    -      -       -      +
    190B  TRP*     4.2     4.7    +      -       -      +
    193B  TYR*     3.9     6.3    -      -       -      +
    219B  LEU      2.8    20.2    +      -       -      +
    220B  ASP      4.0     2.2    -      -       -      +
    222B  VAL*     1.3    73.5    -      -       -      +
    224B  LYS*     1.3    60.7    +      -       +      +
    227B  PHE*     3.2    20.1    -      -       -      +
    301B  RET      3.8    27.6    -      -       +      -
----------------------------------------------------------
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Residues in contact with LYS 224 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     27B  MET*     3.9    14.4    -      -       +      -
     34B  PHE*     4.5     3.5    -      -       -      -
     53B  THR*     5.1     2.1    -      -       -      +
     56B  ILE*     3.7    29.7    -      -       +      +
     57B  PRO*     5.2     3.6    -      -       -      +
     60B  ALA*     3.8    22.0    -      -       +      -
     93B  ASP*     3.9    11.9    -      -       -      -
     94B  TRP*     4.1     1.0    -      -       -      -
     97B  THR*     3.4    19.7    -      -       -      -
    101B  LEU*     4.3     2.4    -      -       +      +
    220B  ASP*     2.9    26.3    +      -       -      +
    223B  ALA*     1.3    82.2    -      -       -      +
    225B  VAL*     1.3    61.7    +      -       +      +
    226B  GLY      3.5     0.2    -      -       -      -
    227B  PHE*     4.0     1.6    -      -       -      +
    228B  GLY*     2.9    25.6    +      -       -      -
    301B  RET      1.1    75.7    -      -       +      +
----------------------------------------------------------
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Residues in contact with VAL 225 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     26B  GLY      4.0    16.6    -      -       -      +
     27B  MET*     4.0    26.7    -      -       -      -
     30B  GLY*     3.9    25.4    -      -       -      +
     34B  PHE*     3.5    12.5    -      -       +      -
     57B  PRO*     4.7     6.1    -      -       +      -
    221B  LEU*     2.9    21.2    +      -       +      +
    224B  LYS*     1.3    72.3    -      -       -      +
    226B  GLY*     1.3    61.1    +      -       -      +
    229B  PHE*     2.9    31.1    +      -       +      +
----------------------------------------------------------
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Residues in contact with GLY 226 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    185B  ILE*     4.6     4.5    -      -       -      -
    221B  LEU      3.1    10.6    +      -       -      -
    222B  VAL*     3.3    12.5    +      -       -      -
    225B  VAL*     1.3    72.7    -      -       -      +
    227B  PHE*     1.3    65.7    +      -       -      +
    229B  PHE*     3.3     6.6    +      -       -      +
    230B  ILE*     3.1    29.7    +      -       -      +
----------------------------------------------------------
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Residues in contact with PHE 227 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     53B  THR*     5.7     0.9    -      -       +      -
    101B  LEU*     3.5    41.1    -      -       +      -
    104B  ASP*     4.0    22.9    -      -       +      -
    105B  ILE*     4.2    13.2    -      -       +      -
    182B  LEU*     3.6    44.3    -      -       +      +
    185B  ILE*     4.2    21.0    -      -       +      +
    186B  ILE*     3.8    28.3    -      -       +      -
    190B  TRP*     6.2     0.2    -      -       -      -
    222B  VAL      3.0     7.9    +      -       -      +
    223B  ALA      3.2    25.6    -      -       -      +
    224B  LYS      4.0     0.9    -      -       -      +
    226B  GLY*     1.3    76.0    -      -       -      +
    228B  GLY*     1.3    68.0    +      -       -      +
    230B  ILE      3.2     0.5    +      -       -      -
    231B  LEU*     3.0    26.6    +      -       +      +
----------------------------------------------------------
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Residues in contact with GLY 228 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     34B  PHE*     3.7     8.3    -      -       -      -
     53B  THR*     3.5    26.2    -      -       -      -
    224B  LYS      2.9    18.3    +      -       -      -
    225B  VAL      3.7     0.9    -      -       -      -
    226B  GLY      3.3     0.2    -      -       -      -
    227B  PHE*     1.3    81.8    -      -       -      +
    229B  PHE*     1.3    54.6    +      -       -      +
    231B  LEU*     3.4     2.0    +      -       -      +
    232B  LEU*     2.9    36.6    +      -       -      +
----------------------------------------------------------
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Residues in contact with PHE 229 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     33B  TYR*     4.0    36.1    -      +       -      -
     34B  PHE*     3.4    11.2    -      +       +      -
    225B  VAL*     2.9    23.0    +      -       +      +
    226B  GLY*     3.6     6.1    -      -       -      +
    228B  GLY*     1.3    71.5    -      -       -      +
    230B  ILE*     1.3    77.6    +      -       +      +
    232B  LEU*     4.5     1.1    -      -       -      +
    233B  ARG*     3.1    59.3    +      -       +      +
----------------------------------------------------------
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Residues in contact with ILE 230 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    178B  THR*     4.5     5.1    -      -       +      +
    181B  ALA*     4.1    22.0    -      -       +      -
    182B  LEU*     3.7    20.0    -      -       +      -
    185B  ILE*     4.1    13.2    -      -       +      -
    226B  GLY      3.1    15.8    +      -       -      +
    227B  PHE      3.7     5.8    -      -       -      +
    229B  PHE*     1.3    95.6    -      -       +      +
    231B  LEU*     1.3    64.0    +      -       -      +
    233B  ARG*     3.5    23.2    +      -       +      +
    234B  SER*     3.5    11.1    +      -       -      -
----------------------------------------------------------
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Residues in contact with LEU 231 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     49B  PHE*     4.0    12.6    -      -       +      -
     53B  THR*     3.5    13.2    -      -       +      +
    104B  ASP*     3.4    40.6    -      -       +      +
    108B  LEU*     4.2    13.9    -      -       +      -
    178B  THR*     4.7     1.3    -      -       +      -
    182B  LEU*     3.7    28.6    -      -       +      +
    227B  PHE*     3.0    22.5    +      -       +      +
    228B  GLY*     3.7     3.6    -      -       -      +
    230B  ILE*     1.3    77.7    -      -       -      +
    232B  LEU*     1.3    68.1    +      -       +      +
    234B  SER*     2.9    26.4    +      -       -      +
    237B  ILE*     3.8    25.1    -      -       +      +
----------------------------------------------------------
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Residues in contact with LEU 232 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     34B  PHE*     3.6    42.4    -      -       +      -
     37B  ASP*     4.4     7.2    -      -       +      +
     46B  GLN*     5.7     0.3    +      -       -      -
     49B  PHE*     3.8    32.1    -      -       +      +
     50B  TYR*     3.7    41.1    +      -       +      +
     53B  THR*     3.8    21.5    -      -       +      +
    228B  GLY      2.9    17.8    +      -       -      +
    229B  PHE*     4.5     1.6    -      -       -      +
    231B  LEU*     1.3    75.8    -      -       +      +
    233B  ARG*     1.3    60.4    +      -       -      +
    234B  SER      3.3     1.8    +      -       -      +
    237B  ILE*     3.8    24.7    -      -       +      +
    238B  MET*     5.5     4.0    -      -       -      +
----------------------------------------------------------
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Residues in contact with ARG 233 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     37B  ASP*     5.7     1.1    -      -       -      -
    229B  PHE*     3.1    59.9    +      -       +      +
    230B  ILE*     3.5    21.5    +      -       -      +
    232B  LEU*     1.3    79.2    -      -       -      +
    234B  SER*     1.3    63.9    +      -       -      +
    235B  ARG*     3.8     4.9    +      -       -      +
    238B  MET*     4.0     9.4    -      -       -      +
----------------------------------------------------------
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A short description of the analytical approach
The contact analysis used in this page is based upon the approach developed in: Sobolev V., Wade R.C., Vriend G. and Edelman M. PROTEINS (1996) 25, 120-129. Contact legitimacy depends on the hydrophobic-hydrophilic properties of the contacting atoms. In order to define it, for each inter-atomic contact, eight atom classes have been introduced:


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

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

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