Contacts of the helix formed by residues 227 - 252 (chain B) in PDB entry 4O9U


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 ASN 227 (chain B).
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     47A  VAL*     3.9    14.4    +      -       -      +
     48A  GLY*     3.6    17.8    -      -       -      -
     51A  VAL*     4.9     7.3    -      -       -      +
      8B  TYR*     4.2     7.4    -      -       -      -
     49B  TRP*     5.0     5.3    -      -       +      -
    222B  GLY      3.2     5.8    -      -       -      +
    225B  VAL*     2.7    17.9    +      -       +      +
    226B  GLY*     1.3    73.4    -      -       -      -
    228B  PRO*     1.4    59.0    -      -       -      +
    229B  ALA*     3.4     9.7    +      -       -      +
    230B  LEU*     3.1    47.7    +      -       +      +
    231B  MET*     3.0    32.9    +      -       -      +
----------------------------------------------------------
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Residues in contact with PRO 228 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
      1B  MET*     5.2     1.1    -      -       +      -
      5B  GLN*     3.2    35.7    -      -       -      +
      8B  TYR*     3.8    20.0    -      -       +      -
     49B  TRP*     5.2     2.2    -      -       +      -
    226B  GLY      3.5     9.6    -      -       -      +
    227B  ASN*     1.4    82.7    -      -       -      +
    229B  ALA*     1.3    59.3    +      -       -      +
    231B  MET*     3.2    16.7    +      -       -      +
    232B  VAL*     2.9    35.9    +      -       -      +
     10C  TYR*     3.3    32.1    -      -       +      +
----------------------------------------------------------
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Residues in contact with ALA 229 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     44A  VAL*     4.7     9.1    -      -       +      +
     47A  VAL*     5.0     7.2    -      -       +      -
      8B  TYR*     3.9    31.8    -      -       +      +
     11B  VAL*     4.1    22.4    -      -       +      -
     15B  PHE*     4.9     1.6    -      -       -      -
     42B  ALA*     5.1     3.6    -      -       +      -
    227B  ASN*     3.4     7.4    +      -       -      +
    228B  PRO*     1.3    78.1    -      -       -      +
    230B  LEU*     1.3    57.9    +      -       +      +
    232B  VAL*     3.3     6.3    +      -       -      +
    233B  ALA*     3.0    33.0    +      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 230 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     44A  VAL*     3.4    47.8    -      -       +      +
     45A  VAL*     3.6    13.7    -      -       +      +
     47A  VAL*     5.4     1.8    -      -       +      -
     48A  GLY*     3.8    15.0    -      -       -      +
     99B  ILE*     5.0     8.5    -      -       +      -
    218B  VAL*     3.5    14.3    -      -       +      +
    219B  GLY*     4.1     0.3    -      -       -      -
    221B  GLU*     4.9     3.6    -      -       +      +
    222B  GLY*     3.5    23.1    -      -       -      +
    225B  VAL*     5.1     4.5    -      -       +      -
    227B  ASN*     3.1    40.8    +      -       +      +
    229B  ALA*     1.3    72.7    -      -       +      +
    231B  MET*     1.3    62.0    +      -       -      +
    234B  GLY*     2.9    30.7    +      -       -      -
----------------------------------------------------------
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Residues in contact with MET 231 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
      2A  GLU      4.7    13.5    -      -       -      +
      3A  PHE*     5.3     5.8    -      -       +      -
      8A  ALA*     5.4     3.4    -      -       -      -
     11A  ILE*     5.3    11.4    -      -       +      +
     15A  THR*     5.0     1.7    +      -       -      +
    219B  GLY*     4.5     5.1    -      -       -      -
    222B  GLY*     3.3    22.2    -      -       -      +
    223B  PHE*     3.6    52.8    -      -       +      +
    225B  VAL      3.6     5.8    -      -       -      +
    226B  GLY*     4.1     6.1    -      -       -      -
    227B  ASN      3.0    36.0    +      -       -      +
    228B  PRO*     3.2    20.6    +      -       +      +
    230B  LEU*     1.3    76.1    -      -       -      +
    232B  VAL*     1.3    64.1    +      -       +      +
    235B  THR*     3.5    18.5    +      -       -      -
     10C  TYR*     6.3     1.1    -      -       -      -
----------------------------------------------------------
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Residues in contact with VAL 232 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     11A  ILE*     5.7     6.3    -      -       +      -
     15A  THR*     3.7    12.8    -      -       +      +
     12B  ALA*     3.6    49.8    -      -       +      +
     15B  PHE*     5.1     4.9    -      -       +      -
     16B  ILE*     4.9    10.5    -      -       +      -
    228B  PRO      2.9    21.8    +      -       -      +
    229B  ALA*     3.6     4.7    -      -       -      +
    230B  LEU      3.2     0.2    -      -       -      -
    231B  MET*     1.3    80.6    -      -       +      +
    233B  ALA*     1.3    61.9    +      -       -      +
    234B  GLY      3.4     0.2    +      -       -      -
    236B  LEU*     3.1    26.4    +      -       +      +
     10C  TYR*     3.7    22.0    -      -       +      -
     14C  LEU*     5.6     8.3    -      -       +      -
----------------------------------------------------------
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Residues in contact with ALA 233 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     41A  ILE*     3.9    12.6    -      -       +      +
     42A  HIS*     4.8     0.6    -      -       -      +
     44A  VAL*     3.8    31.2    -      -       +      -
     15B  PHE*     3.9    18.8    -      -       +      -
    218B  VAL*     5.0     0.2    -      -       -      -
    229B  ALA      3.0    15.9    +      -       -      +
    232B  VAL*     1.3    77.8    -      -       -      +
    234B  GLY*     1.3    64.4    +      -       -      +
    236B  LEU*     3.6     5.9    -      -       -      +
    237B  VAL*     3.1    28.6    +      -       -      +
----------------------------------------------------------
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Residues in contact with GLY 234 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    215B  GLY*     2.8    25.3    -      -       -      +
    218B  VAL*     3.4    19.4    -      -       -      +
    219B  GLY*     3.7     4.0    -      -       -      -
    230B  LEU*     2.9    16.2    +      -       -      +
    232B  VAL      3.3     0.2    -      -       -      -
    233B  ALA*     1.3    76.3    -      -       -      +
    235B  THR*     1.3    58.5    +      -       -      +
    237B  VAL*     3.1     4.4    +      -       -      -
    238B  GLY      2.8    22.5    +      -       -      -
----------------------------------------------------------
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Residues in contact with THR 235 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     12A  PHE*     3.7    36.8    +      -       +      -
     15A  THR*     3.4    27.7    -      -       -      +
     16A  ALA*     5.3     1.6    -      -       -      -
    215B  GLY      4.6     1.1    -      -       -      -
    216B  MET*     5.1     5.4    -      -       -      +
    219B  GLY*     4.0    11.3    -      -       -      -
    220B  PHE*     5.1     4.7    -      -       +      -
    223B  PHE*     3.9    19.4    -      -       +      -
    231B  MET      3.5    10.1    +      -       -      +
    234B  GLY*     1.3    71.9    -      -       -      +
    236B  LEU*     1.3    59.7    +      -       -      +
    237B  VAL      3.3     0.2    -      -       -      -
    238B  GLY*     3.7     6.1    -      -       -      +
    239B  ALA*     3.0    31.9    +      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 236 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     15A  THR*     3.9    16.6    -      -       +      -
     18A  LEU*     4.9     4.3    -      -       +      -
     19A  GLY*     3.9    26.2    -      -       -      +
     22A  LEU*     4.4     7.4    -      -       +      -
     41A  ILE*     4.9    11.7    -      -       +      -
     15B  PHE*     4.7     6.3    -      -       +      +
     16B  ILE*     4.6    26.2    -      -       +      +
     19B  LEU*     3.6    34.4    -      -       +      +
    232B  VAL*     3.1    22.1    +      -       +      +
    233B  ALA*     3.6     7.9    -      -       -      +
    234B  GLY      3.1     0.2    -      -       -      -
    235B  THR*     1.3    81.6    +      -       -      +
    237B  VAL*     1.3    58.6    +      -       +      +
    240B  ALA*     3.3    22.0    +      -       -      +
----------------------------------------------------------
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Residues in contact with VAL 237 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     38A  SER*     3.3    35.8    -      -       -      +
     41A  ILE*     3.6    24.2    -      -       +      -
     42A  HIS*     3.4    37.7    -      -       +      +
     19B  LEU*     6.3     0.9    -      -       +      -
    211B  ASN*     3.9    11.0    -      -       -      +
    212B  ALA*     4.6     0.2    -      -       -      -
    215B  GLY*     4.1     1.3    -      -       -      -
    233B  ALA      3.1    18.9    +      -       -      +
    234B  GLY      3.7     3.1    -      -       -      +
    236B  LEU*     1.3    79.1    -      -       +      +
    238B  GLY*     1.3    53.8    +      -       -      +
    240B  ALA*     3.3     5.1    +      -       -      +
    241B  GLY*     2.7    32.9    +      -       -      -
----------------------------------------------------------
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Residues in contact with GLY 238 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    212B  ALA*     3.8    13.6    -      -       -      +
    215B  GLY*     4.0     0.2    -      -       -      -
    216B  MET*     3.8    28.9    -      -       -      -
    234B  GLY      2.8    15.2    +      -       -      -
    235B  THR*     3.6     2.7    +      -       -      -
    236B  LEU      3.5     0.2    -      -       -      -
    237B  VAL*     1.3    77.9    -      -       -      +
    239B  ALA*     1.3    56.9    +      -       -      +
    241B  GLY*     3.1    14.9    +      -       -      -
    242B  THR*     3.2    16.5    +      -       -      +
----------------------------------------------------------
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Residues in contact with ALA 239 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     15A  THR      4.3     2.7    -      -       -      +
     16A  ALA*     3.4    35.7    -      -       +      +
     19A  GLY*     4.7     3.4    -      -       -      -
     20A  TYR*     4.5    13.4    -      -       +      +
    235B  THR*     3.0    20.3    +      -       -      +
    238B  GLY*     1.3    73.0    -      -       -      +
    240B  ALA*     1.3    60.6    +      -       -      +
    242B  THR*     3.5    14.5    +      -       -      -
    243B  LEU*     3.8    11.4    +      -       -      +
----------------------------------------------------------
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Residues in contact with ALA 240 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     19A  GLY      4.2     5.1    +      -       -      +
     23A  ILE*     3.7    34.0    -      -       +      +
     38A  SER*     5.2     7.6    -      -       -      -
     19B  LEU*     4.7     9.0    -      -       +      -
    236B  LEU      3.3    20.7    +      -       -      +
    237B  VAL*     3.3     7.6    +      -       -      +
    238B  GLY      3.2     0.2    -      -       -      -
    239B  ALA*     1.3    78.6    -      -       -      +
    241B  GLY*     1.3    57.9    +      -       -      +
    243B  LEU*     3.5     3.1    +      -       -      +
    244B  LEU*     2.8    33.2    +      -       +      +
----------------------------------------------------------
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Residues in contact with GLY 241 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     38A  SER*     5.7     0.2    -      -       -      -
    208B  SER      3.6     4.8    -      -       -      +
    211B  ASN*     5.0     2.2    -      -       -      -
    212B  ALA*     3.4    20.4    -      -       -      -
    237B  VAL      2.7    20.0    +      -       -      -
    238B  GLY      3.1     3.0    +      -       -      -
    240B  ALA*     1.3    74.5    -      -       -      +
    242B  THR*     1.3    51.4    +      -       -      +
    244B  LEU*     3.2    16.5    -      -       -      +
    245B  THR*     2.5    34.8    +      -       -      -
----------------------------------------------------------
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Residues in contact with THR 242 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    209B  PHE*     5.4    10.5    -      -       +      -
    212B  ALA*     3.8    15.9    -      -       +      -
    213B  PHE*     6.1     0.4    -      -       +      -
    216B  MET*     4.7    16.4    -      -       +      -
    238B  GLY      3.2     8.1    +      -       -      +
    239B  ALA*     3.5    13.7    +      -       -      -
    241B  GLY*     1.3    72.8    -      -       -      +
    243B  LEU*     1.3    65.1    +      -       -      +
    245B  THR*     3.3     9.2    +      -       -      +
    246B  VAL*     3.2    28.6    +      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 243 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     20A  TYR*     3.0    60.1    -      -       +      +
     23A  ILE*     3.8    21.3    -      -       +      +
     24A  THR*     3.8    13.7    -      -       +      +
    239B  ALA      3.8     7.5    +      -       -      +
    240B  ALA      3.5     7.5    +      -       -      +
    242B  THR*     1.3    77.1    +      -       -      +
    244B  LEU*     1.3    65.8    -      -       -      +
    246B  VAL*     3.3     6.0    +      -       +      +
    247B  LEU*     3.1    48.9    +      -       +      +
----------------------------------------------------------
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Residues in contact with LEU 244 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     23A  ILE*     4.6    11.8    -      -       +      +
     31A  HIS*     3.6    18.8    -      -       -      +
     34A  LEU*     4.7     5.8    -      -       +      +
     35A  MET*     3.7    35.2    -      -       +      +
     38A  SER*     3.8    12.8    -      -       -      +
    208B  SER*     3.4     7.9    -      -       -      +
    211B  ASN*     4.3     1.1    -      -       -      +
    240B  ALA*     2.8    23.7    +      -       +      +
    241B  GLY*     3.2    16.6    -      -       -      +
    243B  LEU*     1.3    76.9    -      -       -      +
    245B  THR*     1.3    56.2    +      -       -      +
    247B  LEU*     4.4     3.7    -      -       -      +
    248B  MET*     3.0    68.2    +      -       +      +
----------------------------------------------------------
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Residues in contact with THR 245 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    205B  VAL*     3.7    23.9    -      -       +      +
    208B  SER*     3.5    19.3    +      -       -      -
    209B  PHE*     3.4    40.5    -      -       +      -
    212B  ALA*     4.6     0.2    -      -       -      +
    241B  GLY      2.5    22.7    +      -       -      -
    242B  THR*     3.4    12.1    -      -       -      -
    243B  LEU      3.1     0.6    -      -       -      -
    244B  LEU*     1.3    76.7    -      -       -      +
    246B  VAL*     1.3    62.5    +      -       -      +
    248B  MET*     3.5     2.0    +      -       -      +
    249B  ALA*     3.1    21.1    +      -       -      +
    256B  VAL*     4.0    11.9    -      -       +      -
----------------------------------------------------------
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Residues in contact with VAL 246 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    242B  THR*     3.2    18.2    +      -       -      +
    243B  LEU*     3.3     6.2    +      -       +      +
    245B  THR*     1.3    76.0    -      -       -      +
    247B  LEU*     1.3    51.7    +      -       -      +
    249B  ALA*     3.0     4.8    +      -       +      +
    250B  ARG*     2.7    56.0    +      -       -      +
    256B  VAL*     4.0    22.7    -      -       +      -
----------------------------------------------------------
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Residues in contact with LEU 247 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     23A  ILE*     4.2     3.8    -      -       +      +
     24A  THR*     5.5     0.4    -      -       -      -
     25A  ARG      5.3     3.6    -      -       -      +
     26A  VAL*     3.9    34.3    -      -       +      +
     28A  VAL*     5.9     2.2    -      -       +      -
     31A  HIS*     4.2    19.5    +      -       +      +
    243B  LEU*     3.1    37.0    +      -       +      +
    244B  LEU*     4.5     3.8    -      -       -      +
    246B  VAL*     1.3    75.5    -      -       -      +
    248B  MET*     1.3    57.8    +      -       +      +
    250B  ARG*     3.3    20.2    +      -       +      +
    251B  ALA*     3.1    26.7    +      -       -      +
----------------------------------------------------------
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Residues in contact with MET 248 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     31A  HIS*     4.2    25.6    -      -       +      +
     32A  THR*     3.9    27.8    -      -       +      -
     35A  MET*     3.8    11.4    -      -       +      +
    204B  PRO*     4.8    18.6    -      -       +      +
    205B  VAL*     3.8    15.1    -      -       +      +
    208B  SER*     3.7    15.3    -      -       -      -
    244B  LEU*     3.0    48.0    +      -       +      +
    245B  THR*     3.8     4.0    -      -       -      +
    246B  VAL      3.3     0.6    -      -       -      -
    247B  LEU*     1.3    78.2    -      -       +      +
    249B  ALA*     1.3    59.5    +      -       -      +
    251B  ALA*     4.2     5.4    -      -       -      +
    252B  MET*     3.4    27.0    +      -       -      +
----------------------------------------------------------
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Residues in contact with ALA 249 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    205B  VAL*     4.3    12.3    -      -       +      +
    245B  THR      3.1    12.6    +      -       -      +
    246B  VAL*     3.0    10.2    +      -       +      +
    248B  MET*     1.3    78.1    -      -       -      +
    250B  ARG*     1.3    62.2    +      -       -      +
    251B  ALA      3.3     0.8    +      -       -      -
    252B  MET*     3.5     7.4    +      -       -      +
    254B  ARG*     3.0    31.5    +      -       +      +
    255B  SER*     4.1     6.3    -      -       -      +
    256B  VAL*     3.7    32.5    -      -       +      +
    259B  VAL*     5.9     2.2    -      -       +      -
----------------------------------------------------------
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Residues in contact with ARG 250 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    246B  VAL*     2.7    35.4    +      -       -      +
    247B  LEU*     3.3    25.5    +      -       +      +
    249B  ALA*     1.3    78.5    -      -       -      +
    251B  ALA*     1.3    60.7    +      -       -      +
    253B  ASN*     3.6    16.6    +      -       -      -
    254B  ARG      4.5     7.8    +      -       -      -
    255B  SER*     6.1     2.0    -      -       -      +
----------------------------------------------------------
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Residues in contact with ALA 251 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     28A  VAL*     4.6    24.2    -      -       +      -
     31A  HIS*     4.6     6.5    -      -       +      -
    247B  LEU      3.1    14.1    +      -       -      +
    248B  MET*     4.2     7.9    -      -       -      +
    249B  ALA      3.3     0.2    -      -       -      -
    250B  ARG*     1.3    75.2    -      -       -      +
    252B  MET*     1.3    58.3    +      -       +      +
    253B  ASN*     3.0    21.9    +      -       -      +
    279B  PRO      5.6     0.9    -      -       -      +
----------------------------------------------------------
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Residues in contact with MET 252 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    201B  GLY      3.7    23.6    -      -       -      +
    202B  ASP*     5.2     2.2    -      -       -      -
    204B  PRO*     5.3     8.7    -      -       +      -
    205B  VAL*     3.8    25.1    -      -       -      -
    248B  MET      3.4    14.0    +      -       -      +
    249B  ALA*     3.5     7.2    +      -       -      +
    250B  ARG      3.5     0.6    -      -       -      -
    251B  ALA*     1.3    75.7    -      -       +      +
    253B  ASN*     1.3    71.4    +      -       -      +
    254B  ARG*     3.4    31.2    +      -       +      +
    259B  VAL*     5.9     1.6    -      -       -      -
----------------------------------------------------------
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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