Contacts of the helix formed by residues 215 - 237 (chain B) in PDB entry 2PID


Residue contacts within the protein are derived with the CSU software (Sobolev V., Sorokine A., Prilusky J., Abola E.E. and Edelman M. (1999) Automated analysis of interatomic contacts in proteins. Bioinformatics, 15, 327-332). A short description of the analytical approach is given at the end of the page.
For CSU analysis of other PDB entry

Note:
Non-standard 3 letter residue codes indicate a heterogroup. To identify and analyse, use LPC software

Legend:
Dist - nearest distance (Å) between atoms of two residues
Surf - contact surface area (Å2) between two residues
HB   - hydrophilic-hydrophilic contact (hydrogen bond)
Arom - aromatic-aromatic contact
Phob - hydrophobic-hydrophobic contact
DC   - hydrophobic-hydrophilic contact (destabilizing contact)
+/-  - indicates presence/absence of a specific contacts
*    - indicates residues forming contacts  by their side chain
       (including CA atoms)
Residues in contact with SER 215 (chain B).
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    190A  GLY      3.8     7.6    -      -       -      -
    191A  GLY*     3.9     9.4    -      -       -      -
    193A  PHE      3.2    11.0    -      -       -      -
    194A  ARG*     3.4    22.4    -      -       -      +
    195A  MET*     3.6     1.7    -      -       -      +
    128B  GLU*     4.1     4.6    -      -       -      -
    214B  MET*     1.3    80.7    -      -       -      +
    216B  LEU*     1.3    64.9    +      -       -      +
    217B  ALA*     3.4     6.8    +      -       -      +
    218B  GLU*     2.8    38.1    +      -       -      +
    219B  PHE*     3.2    17.8    +      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 216 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    185A  PHE*     5.5     1.3    -      -       +      -
    186A  LEU*     4.8     5.4    -      -       +      -
    190A  GLY*     3.3    16.4    +      -       -      +
    193A  PHE*     2.9    30.8    +      -       +      -
    195A  MET*     4.1    16.5    -      -       -      +
    198A  LEU*     4.1    16.2    -      -       +      -
    216A  LEU*     6.3     0.2    -      -       +      -
    219A  PHE*     4.3    10.3    -      -       +      -
    220A  PHE*     3.8    34.1    -      -       +      -
    223A  VAL*     3.9    26.7    -      -       +      -
    215B  SER*     1.3    74.3    -      -       -      +
    217B  ALA*     1.3    58.5    +      -       -      +
    219B  PHE*     3.2     9.5    +      -       +      +
    220B  PHE*     2.9    29.9    +      -       +      +
----------------------------------------------------------
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Residues in contact with ALA 217 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    186A  LEU*     3.7    18.8    -      -       -      +
    190A  GLY*     3.3    23.4    +      -       -      -
    191A  GLY*     4.0     3.1    -      -       -      +
    119B  LEU*     3.7    30.5    -      -       +      +
    215B  SER*     3.2     4.4    -      -       -      +
    216B  LEU*     1.3    82.3    -      -       -      +
    218B  GLU*     1.3    63.0    +      -       +      +
    220B  PHE*     3.4     5.7    +      -       -      +
    221B  TYR*     3.1    18.5    +      -       -      +
----------------------------------------------------------
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Residues in contact with GLU 218 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    119B  LEU      5.9     2.2    -      -       -      +
    120B  GLY      4.6     8.1    -      -       -      +
    122B  PRO*     3.3    42.9    -      -       +      +
    125B  ARG*     5.7     0.7    +      -       -      -
    127B  LYS      4.6     1.0    -      -       -      +
    128B  GLU*     3.1    34.1    -      -       +      +
    129B  ARG*     4.5     7.1    +      -       +      +
    204B  VAL*     5.9     0.7    -      -       -      +
    207B  ARG*     2.8    33.5    +      -       -      -
    214B  MET*     3.5     8.9    -      -       +      +
    215B  SER*     2.8    35.7    +      -       -      +
    217B  ALA*     1.3    78.4    -      -       +      +
    219B  PHE*     1.3    62.9    +      -       -      +
    221B  TYR*     3.4    11.0    -      -       -      +
    222B  GLN*     4.5     1.2    +      -       -      +
----------------------------------------------------------
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Residues in contact with PHE 219 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    195A  MET*     3.4    34.8    -      -       +      -
    216A  LEU*     4.1    20.9    -      -       +      -
    219A  PHE*     4.4     3.1    -      +       -      -
    195B  MET*     3.5    31.2    -      -       +      -
    198B  LEU*     3.9    22.7    -      -       +      -
    199B  LEU*     3.4    23.3    -      -       +      -
    204B  VAL*     4.3    10.8    -      -       +      -
    214B  MET*     3.9    12.3    -      -       -      +
    215B  SER      3.2    13.3    +      -       -      +
    216B  LEU*     3.4    16.2    -      -       +      +
    218B  GLU*     1.3    78.7    -      -       -      +
    220B  PHE*     1.3    66.7    +      +       -      +
    221B  TYR      3.4     0.5    +      -       -      -
    222B  GLN*     3.3    41.8    +      -       -      +
    223B  VAL*     4.6     1.2    -      -       +      +
----------------------------------------------------------
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Residues in contact with PHE 220 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    182A  LEU*     4.1     6.7    -      -       +      -
    186A  LEU*     3.4    36.6    -      -       +      -
    216A  LEU*     3.8    28.5    -      -       +      -
    220A  PHE*     3.8    36.1    -      +       -      -
    119B  LEU*     4.9     0.9    -      -       +      -
    185B  PHE*     4.0    16.2    -      +       -      -
    186B  LEU*     4.0    14.6    -      -       +      -
    216B  LEU*     2.9    20.6    +      -       +      +
    217B  ALA      3.8     5.2    -      -       -      +
    218B  GLU      3.3     0.2    -      -       -      -
    219B  PHE*     1.3    76.7    -      +       -      +
    221B  TYR*     1.3    66.9    +      -       -      +
    222B  GLN      3.2     0.4    -      -       -      -
    223B  VAL*     2.8    42.0    +      -       +      +
    224B  LEU*     3.3    13.5    +      -       +      +
----------------------------------------------------------
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Residues in contact with TYR 221 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     81B  ASP*     2.5    24.1    +      -       -      -
    116B  THR*     3.4    36.5    -      -       +      -
    119B  LEU*     4.2    12.3    -      -       +      +
    120B  GLY      3.2    21.3    -      -       -      +
    121B  ASP*     3.2    36.6    -      -       +      +
    122B  PRO*     3.8     6.7    -      -       +      -
    217B  ALA      3.1    11.8    +      -       -      +
    218B  GLU      3.4    14.6    -      -       -      +
    219B  PHE      3.2     0.8    -      -       -      -
    220B  PHE*     1.3    75.4    -      -       -      +
    222B  GLN*     1.3    68.8    +      -       -      +
    224B  LEU*     3.0    17.6    +      -       -      +
    225B  GLN*     3.1    22.5    +      -       +      -
    250B  ASN*     4.2     3.1    -      -       -      -
    384B  YSA      2.8    32.3    +      -       -      +
----------------------------------------------------------
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Residues in contact with GLN 222 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    122B  PRO*     5.7     0.2    -      -       -      +
    198B  LEU*     3.2    38.3    +      -       +      +
    201B  ARG*     3.4    18.5    -      -       -      +
    204B  VAL*     3.3    21.5    -      -       +      +
    218B  GLU      4.5     1.2    +      -       -      +
    219B  PHE*     3.3    31.9    +      -       -      +
    221B  TYR*     1.3    81.1    -      -       -      +
    223B  VAL*     1.3    61.7    +      -       +      +
    224B  LEU      3.3     0.2    -      -       -      -
    225B  GLN*     3.8     2.6    -      -       -      +
    226B  ALA*     3.0    29.1    +      -       -      +
    249B  GLY      5.6     0.2    -      -       -      -
    250B  ASN*     3.4    27.4    -      -       -      +
    253B  SER*     3.1    26.5    +      -       -      +
----------------------------------------------------------
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Residues in contact with VAL 223 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    216A  LEU*     3.7    26.9    -      -       +      -
    185B  PHE*     4.0    11.7    -      -       +      -
    193B  PHE*     3.8    27.2    -      -       +      -
    198B  LEU*     4.2    20.0    -      -       +      -
    219B  PHE*     4.6     1.8    -      -       +      +
    220B  PHE*     2.8    44.7    +      -       +      +
    222B  GLN*     1.3    79.7    -      -       +      +
    224B  LEU*     1.3    59.5    +      -       -      +
    226B  ALA*     3.4     6.4    +      -       -      +
    227B  TYR*     2.9    27.5    +      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 224 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    182A  LEU*     3.8    20.0    -      -       +      -
    183A  VAL*     4.2    18.8    -      -       +      -
    186A  LEU*     4.7     2.9    -      -       +      -
    116B  THR*     3.7    26.5    -      -       +      +
    119B  LEU*     4.0    27.4    -      -       +      -
    177B  TYR*     2.7    46.4    +      -       +      +
    185B  PHE*     4.7     2.7    -      -       +      -
    220B  PHE*     3.3    23.8    +      -       +      +
    221B  TYR*     3.0     9.6    +      -       -      +
    223B  VAL*     1.3    79.5    -      -       -      +
    225B  GLN*     1.3    57.4    +      -       -      +
    227B  TYR*     3.1     0.6    +      -       -      -
    228B  ASP*     2.8    22.5    +      -       -      -
----------------------------------------------------------
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Residues in contact with GLN 225 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     77B  TYR*     3.5     2.8    +      -       -      -
    116B  THR*     4.7     1.0    -      -       -      +
    221B  TYR*     3.1    19.1    +      -       +      +
    222B  GLN*     4.0     6.1    -      -       -      +
    224B  LEU*     1.3    76.0    -      -       -      +
    226B  ALA*     1.3    63.3    +      -       -      +
    228B  ASP*     3.4     4.1    +      -       -      +
    229B  PHE*     3.2    18.5    +      -       -      +
    241B  GLN*     2.9    26.4    +      -       -      +
    247B  GLN*     2.9    20.8    +      -       -      +
    250B  ASN*     3.3    34.1    +      -       +      +
    251B  ILE*     4.3     5.5    -      -       -      +
    384B  YSA      2.8    60.6    +      -       +      -
----------------------------------------------------------
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Residues in contact with ALA 226 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    193B  PHE*     3.7    23.1    -      -       +      -
    222B  GLN      3.0    19.3    +      -       -      +
    223B  VAL      3.6     4.5    -      -       -      +
    224B  LEU      3.2     0.2    -      -       -      -
    225B  GLN*     1.3    77.6    -      -       -      +
    227B  TYR*     1.3    62.2    +      -       -      +
    229B  PHE*     3.2     6.6    +      -       -      +
    230B  TYR*     3.2    18.5    +      -       -      +
    250B  ASN      4.7     1.1    +      -       -      -
    253B  SER*     3.8     6.1    -      -       -      -
    254B  GLY*     3.7    34.2    -      -       -      +
    257B  PHE*     4.2     5.4    -      -       +      -
----------------------------------------------------------
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Residues in contact with TYR 227 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    176B  TRP*     4.2    15.0    -      +       +      -
    177B  TYR*     3.5    27.6    -      +       -      +
    180B  GLN*     4.2    19.3    +      -       +      -
    185B  PHE*     3.7    31.9    -      +       +      -
    189B  VAL*     4.2    16.6    -      -       +      -
    193B  PHE*     4.6     2.4    -      -       +      -
    223B  VAL      2.9    18.1    +      -       -      +
    226B  ALA*     1.3    75.0    -      -       -      +
    228B  ASP*     1.3    54.2    +      -       -      +
    230B  TYR*     3.1    34.2    +      +       -      +
    231B  TYR*     2.7    54.4    +      +       +      +
    257B  PHE*     4.3    11.4    -      +       -      -
----------------------------------------------------------
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Residues in contact with ASP 228 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     77B  TYR*     3.8     2.2    -      -       -      +
    111B  LEU*     3.5     9.3    -      -       +      +
    116B  THR*     4.5     0.2    -      -       -      +
    173B  ASN*     2.9    27.5    +      -       -      +
    176B  TRP*     3.0    25.3    +      -       +      +
    177B  TYR*     3.0    22.5    +      -       -      -
    224B  LEU      2.8    14.8    +      -       -      +
    225B  GLN*     3.4     4.8    -      -       -      +
    227B  TYR*     1.3    77.1    -      -       -      +
    229B  PHE*     1.3    56.2    +      -       -      +
    231B  TYR*     3.2     2.3    +      -       -      +
    232B  LEU*     2.9    35.6    +      -       -      +
    384B  YSA      2.5    33.9    +      -       -      +
----------------------------------------------------------
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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
----------------------------------------------------------
     77B  TYR*     3.6    18.1    +      +       -      +
    225B  GLN      3.2     9.2    +      -       -      +
    226B  ALA      3.4    10.5    -      -       -      +
    227B  TYR      3.2     0.2    -      -       -      -
    228B  ASP*     1.3    79.4    -      -       -      +
    230B  TYR*     1.3    57.6    +      -       -      +
    232B  LEU*     3.2     1.4    +      -       -      -
    233B  PHE*     2.8    27.5    +      -       -      +
    238B  CYS*     3.9    21.8    -      -       -      -
    239B  ARG      4.0     1.6    -      -       -      -
    240B  VAL      3.8    13.2    -      -       -      -
    241B  GLN*     3.2    33.9    -      -       +      +
    251B  ILE*     4.3    11.0    -      -       +      -
    254B  GLY*     4.0    18.4    -      -       -      -
    255B  TYR*     4.2     1.6    -      -       +      -
    258B  ILE*     3.7    13.7    -      -       +      -
    266B  VAL*     3.8    24.2    -      -       +      -
    267B  PHE      3.5    23.1    -      -       -      -
----------------------------------------------------------
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Residues in contact with TYR 230 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    189B  VAL*     5.3     3.8    -      -       +      -
    226B  ALA      3.2     1.8    +      -       -      +
    227B  TYR*     3.1    37.6    +      +       -      +
    229B  PHE*     1.3    77.0    -      -       -      +
    231B  TYR*     1.3    60.4    +      -       -      +
    233B  PHE*     3.2     3.8    +      +       -      +
    234B  GLN*     2.9    74.4    +      -       +      +
    257B  PHE*     3.6    32.3    -      +       +      -
    258B  ILE*     3.7    23.8    -      -       +      +
    261B  LEU*     4.1    24.4    -      -       +      +
    262B  THR*     4.2    15.9    -      -       +      -
----------------------------------------------------------
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Residues in contact with TYR 231 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    175B  ALA*     5.8     0.2    -      -       -      +
    176B  TRP*     3.1    68.4    -      +       +      +
    227B  TYR*     2.7    42.0    +      -       +      +
    228B  ASP*     3.2     5.6    +      -       -      +
    230B  TYR*     1.3    78.5    -      -       -      +
    232B  LEU*     1.3    70.9    +      -       +      +
    234B  GLN*     3.8     4.4    -      -       -      +
    235B  ARG*     2.8    74.2    +      -       +      +
    236B  TYR*     4.4     2.9    +      +       -      -
----------------------------------------------------------
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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
----------------------------------------------------------
     77B  TYR*     3.5    50.3    -      -       +      -
    109B  ILE*     4.4     9.4    -      -       +      -
    111B  LEU*     4.5     9.0    -      -       +      -
    171B  LEU*     4.0    13.2    -      -       +      -
    176B  TRP*     4.0     6.7    -      -       +      -
    228B  ASP      2.9    20.7    +      -       -      +
    229B  PHE      3.9     2.7    -      -       -      +
    231B  TYR*     1.3    83.8    -      -       +      +
    233B  PHE*     1.3    62.1    +      -       -      +
    236B  TYR*     2.8    56.8    +      -       +      +
    237B  GLY      3.3     3.8    +      -       -      -
    238B  CYS*     3.3    20.2    +      -       +      -
----------------------------------------------------------
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Residues in contact with PHE 233 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    229B  PHE*     2.8    18.6    +      -       +      +
    230B  TYR*     3.5     6.7    -      +       -      +
    232B  LEU*     1.3    77.4    -      -       -      +
    234B  GLN*     1.3    79.7    +      -       +      +
    237B  GLY*     2.8    30.4    +      -       -      -
    238B  CYS      3.2    26.6    +      -       -      +
    239B  ARG*     3.4    36.1    -      -       +      -
    258B  ILE*     4.2    16.6    -      -       +      -
    262B  THR*     4.4    12.1    -      -       +      -
    264B  GLU*     3.2    37.2    -      -       +      -
    266B  VAL*     3.9    13.5    -      -       +      -
----------------------------------------------------------
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Residues in contact with GLN 234 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    230B  TYR*     2.9    65.7    +      -       +      +
    231B  TYR*     3.8     4.5    -      -       -      +
    233B  PHE*     1.3    96.6    -      -       +      +
    235B  ARG*     1.3    62.5    +      -       -      +
    237B  GLY      4.3     0.9    +      -       -      -
    262B  THR*     4.6     7.2    -      -       -      +
----------------------------------------------------------
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Residues in contact with ARG 235 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    231B  TYR*     2.8    66.0    +      -       +      +
    234B  GLN*     1.3    76.7    -      -       -      +
    236B  TYR*     1.3    93.9    +      -       +      +
----------------------------------------------------------
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Residues in contact with TYR 236 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     75B  THR*     4.0    14.7    +      -       +      -
    109B  ILE*     4.3    18.4    -      -       +      -
    169B  THR*     6.3     1.6    -      -       +      -
    171B  LEU*     3.6    37.3    -      -       +      +
    176B  TRP*     6.0     0.2    -      -       -      -
    231B  TYR*     4.4     3.8    -      +       -      -
    232B  LEU*     2.8    36.8    +      -       +      +
    235B  ARG*     1.3   120.2    +      -       +      +
    237B  GLY*     1.3    64.9    +      -       -      +
    238B  CYS*     3.4     2.6    +      -       +      +
----------------------------------------------------------
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Residues in contact with GLY 237 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     74B  GLN*     5.2     2.1    -      -       -      +
     75B  THR*     4.1     8.9    +      -       -      -
    233B  PHE*     2.8    24.0    +      -       -      -
    234B  GLN      4.3     1.2    +      -       -      -
    235B  ARG      3.6     1.4    -      -       -      -
    236B  TYR*     1.3    79.0    -      -       -      +
    238B  CYS*     1.3    63.6    +      -       -      +
    239B  ARG*     3.3    12.7    +      -       -      +
----------------------------------------------------------
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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