Contacts of the helix formed by residues 198 - 227 (chain A) in PDB entry 4DUB


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 TYR 198 (chain A).
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    190A  ARG*     3.5    55.9    +      -       +      +
    191A  ALA      5.2     1.7    +      -       -      -
    192A  ASN*     3.4    23.3    +      -       +      -
    193A  PRO      3.6    24.0    -      -       -      +
    195A  ASP*     3.3    18.5    +      -       +      +
    196A  PRO      3.1     1.0    -      -       -      -
    197A  ALA*     1.3    86.4    -      -       +      +
    199A  ASP*     1.3    63.6    +      -       -      +
    200A  GLU      3.0     2.5    -      -       -      -
    201A  ASN*     3.1    15.5    +      -       -      +
    202A  LYS*     2.9    30.8    +      -       -      +
----------------------------------------------------------
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Residues in contact with ASP 199 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    194A  ASP      4.8     1.7    -      -       -      +
    195A  ASP      4.1     2.8    -      -       -      +
    196A  PRO*     2.9    39.9    +      -       -      +
    198A  TYR*     1.3    77.1    -      -       -      +
    200A  GLU*     1.3    56.5    +      -       -      +
    202A  LYS*     3.5    19.7    +      -       -      +
    203A  ARG*     3.1    27.5    +      -       -      +
----------------------------------------------------------
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Residues in contact with GLU 200 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    196A  PRO      4.6     0.8    +      -       -      -
    197A  ALA      4.6     4.7    +      -       -      +
    198A  TYR      3.0     1.0    -      -       -      -
    199A  ASP*     1.3    75.4    -      -       -      +
    201A  ASN*     1.3    68.6    +      -       -      +
    203A  ARG*     2.8    45.2    +      -       -      +
    204A  GLN*     2.9    34.9    +      -       +      +
----------------------------------------------------------
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Residues in contact with ASN 201 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    183A  GLU*     3.1    34.2    -      -       -      +
    186A  ASN*     5.7     0.9    +      -       -      -
    190A  ARG*     3.6    11.5    +      -       -      +
    197A  ALA      3.7     7.9    +      -       -      -
    198A  TYR*     3.4    33.2    -      -       -      +
    200A  GLU*     1.3    81.8    -      -       -      +
    202A  LYS*     1.4    51.8    +      -       +      +
    204A  GLN*     3.3     6.3    +      -       -      +
    205A  PHE*     2.8    37.2    +      -       -      +
----------------------------------------------------------
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Residues in contact with LYS 202 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    183A  GLU*     5.3     3.6    -      -       -      +
    187A  LYS*     5.7     7.9    -      -       -      +
    190A  ARG*     6.0     2.2    -      -       -      +
    193A  PRO*     3.2    26.9    +      -       -      -
    194A  ASP*     3.4    27.7    +      -       -      +
    195A  ASP      4.6     1.6    +      -       -      -
    198A  TYR*     2.9    21.8    +      -       +      +
    199A  ASP*     3.7    18.6    +      -       -      +
    200A  GLU      3.2     0.2    -      -       -      -
    201A  ASN*     1.4    75.8    -      -       +      +
    203A  ARG*     1.3    65.0    +      -       -      +
    205A  PHE*     3.3     8.2    +      -       +      +
    206A  GLN*     3.0    31.1    +      -       +      +
----------------------------------------------------------
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Residues in contact with ARG 203 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    199A  ASP      3.1    18.6    +      -       -      +
    200A  GLU*     2.8    44.6    +      -       -      +
    202A  LYS*     1.3    71.3    -      -       -      +
    204A  GLN*     1.3    86.4    +      -       -      +
    206A  GLN*     3.2     8.9    +      -       -      +
    207A  GLU*     2.9    52.9    +      -       +      +
----------------------------------------------------------
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Residues in contact with GLN 204 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    179A  ARG*     3.4    32.8    +      -       +      +
    200A  GLU*     2.9    23.2    +      -       -      +
    201A  ASN*     3.7     6.3    -      -       -      +
    203A  ARG*     1.3    98.4    +      -       -      +
    205A  PHE*     1.3    58.6    +      -       -      +
    207A  GLU*     3.0    29.8    +      -       -      +
    208A  ASP*     2.9    50.4    +      -       -      +
----------------------------------------------------------
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Residues in contact with PHE 205 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     77A  PHE      4.4     4.7    -      -       -      -
     80A  ASP*     4.0    25.1    -      -       +      -
     81A  PHE*     4.1    19.7    -      +       -      -
    180A  ALA*     3.6    31.0    -      -       +      -
    183A  GLU*     3.5    29.4    -      -       +      -
    184A  ALA*     4.5     4.0    -      -       +      -
    187A  LYS*     3.4    25.8    -      -       -      -
    201A  ASN      2.8    19.3    +      -       -      +
    202A  LYS*     3.6     7.2    -      -       -      +
    203A  ARG      3.2     0.2    -      -       -      -
    204A  GLN*     1.3    78.5    -      -       -      +
    206A  GLN*     1.3    72.5    +      -       -      +
    208A  ASP*     3.2     6.3    +      -       -      +
    209A  ILE*     3.0    46.5    +      -       +      +
----------------------------------------------------------
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Residues in contact with GLN 206 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    202A  LYS*     3.0    18.1    +      -       +      +
    203A  ARG*     3.2    10.5    +      -       +      +
    205A  PHE*     1.3    97.4    -      -       -      +
    207A  GLU*     1.3    55.9    +      -       -      +
    209A  ILE*     3.4    21.1    +      -       -      +
    210A  LYS*     3.0    27.2    +      -       -      +
----------------------------------------------------------
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Residues in contact with GLU 207 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    179A  ARG*     4.2     6.6    +      -       -      -
    203A  ARG*     2.9    42.4    +      -       +      +
    204A  GLN*     3.0    28.0    +      -       -      +
    206A  GLN*     1.3    75.6    -      -       -      +
    208A  ASP*     1.3    58.1    +      -       -      +
    210A  LYS*     3.2     6.9    +      -       -      +
    211A  VAL*     3.0    39.6    +      -       +      +
----------------------------------------------------------
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Residues in contact with ASP 208 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    176A  SER*     2.8    44.1    +      -       -      +
    179A  ARG*     2.9    50.4    +      -       -      +
    180A  ALA*     4.4     8.7    -      -       +      -
    204A  GLN*     2.9    29.6    +      -       -      +
    205A  PHE*     3.7     6.7    -      -       -      +
    207A  GLU*     1.3    75.6    -      -       -      +
    209A  ILE*     1.4    64.2    +      -       -      +
    211A  VAL*     3.4     2.8    +      -       -      +
    212A  MET*     3.1    29.5    +      -       -      +
----------------------------------------------------------
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Residues in contact with ILE 209 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     80A  ASP*     3.6    21.3    -      -       +      +
     81A  PHE*     3.8    21.5    -      -       +      -
    180A  ALA*     5.7     0.4    -      -       +      -
    205A  PHE*     3.0    43.9    +      -       +      +
    206A  GLN*     3.6    26.9    -      -       -      +
    208A  ASP*     1.4    75.8    -      -       -      +
    210A  LYS*     1.3    59.3    +      -       +      +
    212A  MET*     3.2     9.1    +      -       +      +
    213A  ASN*     2.9    51.4    +      -       -      +
----------------------------------------------------------
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Residues in contact with LYS 210 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    206A  GLN      3.0    16.4    +      -       -      +
    207A  GLU*     3.2     7.1    +      -       -      +
    209A  ILE*     1.3    79.0    -      -       -      +
    211A  VAL*     1.3    56.2    +      -       -      +
    213A  ASN*     4.5     4.5    -      -       -      +
    214A  ASP*     2.7    67.4    +      -       -      +
----------------------------------------------------------
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Residues in contact with VAL 211 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    172A  PRO*     3.8    22.4    -      -       +      +
    173A  PHE*     4.0    10.8    -      -       +      -
    176A  SER*     3.5    28.7    -      -       -      +
    207A  GLU*     3.0    28.4    +      -       +      +
    208A  ASP      3.7     3.6    -      -       -      +
    210A  LYS*     1.3    76.4    -      -       -      +
    212A  MET*     1.3    62.1    +      -       -      +
    214A  ASP*     4.0     3.8    -      -       -      +
    215A  LEU*     3.3    23.8    +      -       +      +
----------------------------------------------------------
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Residues in contact with MET 212 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     81A  PHE*     3.8    28.9    -      -       +      -
    173A  PHE*     3.6    35.9    -      -       +      +
    176A  SER*     4.3     2.0    -      -       -      +
    177A  MET*     3.6    33.2    -      -       -      +
    180A  ALA*     3.7    28.3    -      -       +      -
    208A  ASP      3.1    27.5    +      -       -      +
    209A  ILE*     3.2     6.9    +      -       -      +
    211A  VAL*     1.3    79.1    -      -       -      +
    213A  ASN*     1.3    62.0    +      -       -      +
    216A  VAL*     3.1    29.6    +      -       -      +
    259A  ILE*     4.2    21.5    -      -       +      -
----------------------------------------------------------
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Residues in contact with ASN 213 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     81A  PHE      4.8     1.7    -      -       -      +
    209A  ILE*     2.9    40.6    +      -       -      +
    210A  LYS*     4.0     4.6    -      -       -      +
    212A  MET*     1.3    74.1    -      -       -      +
    214A  ASP*     1.3    64.3    +      -       -      +
    217A  ASP*     2.8    38.4    +      -       -      +
    255A  ARG*     3.5    51.1    +      -       -      +
    256A  TYR*     4.6     6.5    +      -       -      -
    259A  ILE*     3.6    10.6    -      -       -      +
----------------------------------------------------------
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Residues in contact with ASP 214 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    210A  LYS*     2.7    62.9    +      -       -      +
    211A  VAL*     4.0     4.8    -      -       -      +
    213A  ASN*     1.3    74.3    -      -       -      +
    215A  LEU*     1.4    61.7    +      -       -      +
    217A  ASP*     4.0     4.6    -      -       -      +
    218A  LYS*     3.0    25.7    +      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 215 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    158A  PHE*     4.7     6.1    -      -       +      -
    160A  TYR*     3.8    43.5    -      -       +      +
    162A  PHE*     4.3     3.8    -      -       +      -
    171A  HIS*     3.9     7.4    -      -       +      -
    173A  PHE*     3.8    34.1    -      -       +      -
    211A  VAL*     3.3    15.8    +      -       +      +
    212A  MET      4.1     2.7    -      -       -      +
    214A  ASP*     1.4    78.2    -      -       -      +
    216A  VAL*     1.4    65.6    +      -       -      +
    218A  LYS*     3.2    15.9    +      -       +      +
    219A  ILE*     3.0    36.6    +      -       +      +
----------------------------------------------------------
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Residues in contact with VAL 216 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    158A  PHE*     4.1    16.8    -      -       +      -
    173A  PHE*     3.7    22.2    -      -       +      -
    212A  MET      3.1    17.1    +      -       -      +
    215A  LEU*     1.4    76.5    -      -       +      +
    217A  ASP*     1.3    58.2    +      -       -      +
    219A  ILE*     3.3     2.0    +      -       -      +
    220A  ILE*     2.9    29.0    +      -       +      +
    255A  ARG*     3.5    38.4    -      -       +      +
    258A  ILE*     3.9    39.0    -      -       +      -
    259A  ILE*     4.2     7.0    -      -       +      -
----------------------------------------------------------
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Residues in contact with ASP 217 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    213A  ASN*     2.8    29.9    +      -       -      +
    214A  ASP*     4.0     5.2    -      -       -      +
    216A  VAL*     1.3    71.2    -      -       -      +
    218A  LYS*     1.3    57.7    +      -       -      +
    220A  ILE*     3.4     8.6    +      -       -      +
    221A  ALA*     2.8    32.2    +      -       -      +
    251A  ASP      5.0     1.2    -      -       -      +
    252A  GLU*     5.6     0.9    -      -       -      -
    255A  ARG*     2.7    53.0    +      -       -      +
----------------------------------------------------------
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Residues in contact with LYS 218 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    214A  ASP      3.0    19.4    +      -       -      +
    215A  LEU*     3.5    15.7    -      -       +      +
    217A  ASP*     1.3    77.4    -      -       -      +
    219A  ILE*     1.3    64.2    +      -       +      +
    221A  ALA*     3.4     5.8    +      -       -      +
    222A  ASP*     2.8    59.1    +      -       -      +
    136B  ASP*     4.6    23.2    -      -       -      +
----------------------------------------------------------
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Residues in contact with ILE 219 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    158A  PHE*     3.6    48.0    -      -       +      +
    160A  TYR*     3.8    28.5    -      -       +      -
    215A  LEU*     3.0    28.6    +      -       +      +
    216A  VAL      3.3     4.0    +      -       -      +
    218A  LYS*     1.3    84.6    -      -       +      +
    220A  ILE*     1.3    57.7    +      -       -      +
    222A  ASP*     3.4    18.1    +      -       +      +
    223A  ARG*     3.0    31.1    +      -       +      +
    234A  LEU*     4.2     9.6    -      -       +      -
----------------------------------------------------------
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Residues in contact with ILE 220 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    216A  VAL*     2.9    24.6    +      -       +      +
    217A  ASP*     3.7     7.9    -      -       -      +
    219A  ILE*     1.3    75.5    -      -       +      +
    221A  ALA*     1.3    57.7    +      -       -      +
    223A  ARG*     3.1     4.2    +      -       -      +
    224A  LYS*     2.9    36.7    +      -       +      +
    234A  LEU*     3.8    24.9    -      -       +      -
    238A  LEU*     4.6    11.1    -      -       +      +
    251A  ASP*     3.7    38.6    -      -       +      +
    254A  ILE*     3.9     7.6    -      -       +      -
    255A  ARG*     3.6    37.9    -      -       +      +
    258A  ILE*     4.2     5.8    -      -       +      -
----------------------------------------------------------
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Residues in contact with ALA 221 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    217A  ASP      2.8    20.9    +      -       -      +
    218A  LYS*     3.6     7.2    -      -       -      +
    220A  ILE*     1.3    73.4    -      -       -      +
    222A  ASP*     1.3    60.2    +      -       -      +
    224A  LYS*     3.5     8.8    +      -       -      +
    225A  ALA*     3.0    28.1    +      -       -      +
----------------------------------------------------------
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Residues in contact with ASP 222 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    218A  LYS*     2.8    57.2    +      -       -      +
    219A  ILE*     3.7    17.1    -      -       +      +
    221A  ALA*     1.3    75.0    -      -       -      +
    223A  ARG*     1.3    58.0    +      -       -      +
    225A  ALA*     3.4     6.7    +      -       -      +
    226A  SER*     2.9    31.2    +      -       -      -
    135B  ALA*     6.0     1.9    -      -       -      +
----------------------------------------------------------
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Residues in contact with ARG 223 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    158A  PHE      3.4    17.2    +      -       -      -
    159A  ASN*     3.5    14.6    -      -       -      +
    219A  ILE*     3.0    20.0    +      -       -      +
    220A  ILE      3.6     3.8    -      -       -      +
    222A  ASP*     1.3    73.7    -      -       -      +
    224A  LYS*     1.3    65.8    +      -       -      +
    226A  SER*     3.4     4.5    +      -       -      -
    227A  GLY*     3.1    21.0    +      -       -      -
    228A  GLU*     3.3    41.1    +      -       -      +
    230A  SER*     4.2     8.1    -      -       -      -
    232A  ASP*     2.8    41.2    +      -       -      -
    234A  LEU*     3.8    16.9    -      -       +      +
    235A  THR*     3.1    20.5    +      -       -      +
    238A  LEU*     3.5    23.7    -      -       +      +
----------------------------------------------------------
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Residues in contact with LYS 224 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    220A  ILE*     2.9    21.9    +      -       +      +
    221A  ALA*     3.7     8.1    -      -       -      +
    223A  ARG*     1.3    78.9    -      -       -      +
    225A  ALA*     1.3    60.2    +      -       -      +
    226A  SER      3.6     0.2    +      -       -      -
    227A  GLY*     3.8     6.9    +      -       -      -
    238A  LEU*     3.9    26.9    -      -       +      -
    251A  ASP*     2.7    42.8    +      -       -      +
----------------------------------------------------------
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Residues in contact with ALA 225 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    221A  ALA      3.0    17.4    +      -       -      +
    222A  ASP*     3.7     7.4    -      -       -      +
    223A  ARG      3.3     0.2    -      -       -      -
    224A  LYS*     1.3    78.3    -      -       -      +
    226A  SER*     1.3    61.6    +      -       -      +
    227A  GLY      3.6     0.3    +      -       -      -
----------------------------------------------------------
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Residues in contact with SER 226 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    222A  ASP      2.9    15.2    +      -       -      -
    223A  ARG*     3.4     9.9    +      -       -      -
    224A  LYS      3.4     0.2    -      -       -      -
    225A  ALA*     1.3    78.9    -      -       -      +
    227A  GLY*     1.3    59.8    +      -       -      +
    228A  GLU*     3.1    29.8    +      -       -      +
----------------------------------------------------------
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Residues in contact with GLY 227 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    223A  ARG      3.1    10.5    +      -       -      -
    224A  LYS      3.8     5.2    +      -       -      -
    225A  ALA      3.4     3.2    +      -       -      -
    226A  SER*     1.3    77.0    +      -       -      +
    228A  GLU*     1.3    55.6    +      -       -      +
    229A  GLN*     2.8    29.5    +      -       -      +
----------------------------------------------------------
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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