Contacts of the helix formed by residues 206 - 233 (chain A) in PDB entry 5I7L


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 206 (chain A).
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    202A  GLY      3.3    19.9    +      -       -      -
    203A  LEU      3.6     4.3    -      -       -      -
    204A  LEU      2.4    18.8    +      -       -      -
    205A  ASP*     1.3    66.8    +      -       -      +
    207A  LEU*     1.3    58.9    +      -       -      +
    209A  GLY*     3.0     3.8    +      -       -      -
    210A  ILE*     2.9    34.0    +      -       -      +
     90B  GLY      4.5     1.4    +      -       -      -
     91B  LEU*     3.5    29.0    +      -       -      +
     94B  LYS*     4.0    16.2    -      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 207 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     74A  LEU*     6.0     5.4    -      -       +      -
    108A  ILE*     4.6    14.1    -      -       +      -
    139A  LEU*     6.1     2.5    -      -       +      -
    141A  VAL*     3.5    32.3    -      -       +      -
    151A  LEU*     4.4    11.4    -      -       +      -
    153A  LEU*     4.2    18.4    -      -       +      -
    203A  LEU*     3.1    17.5    +      -       +      +
    204A  LEU*     4.5     4.7    -      -       +      -
    206A  SER*     1.3    80.2    +      -       -      +
    208A  THR*     1.3    50.8    +      -       -      +
    210A  ILE*     3.2    12.2    +      -       +      +
    211A  LEU*     2.8    56.8    +      -       +      +
     91B  LEU*     3.7    23.7    -      -       +      +
----------------------------------------------------------
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Residues in contact with THR 208 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    153A  LEU*     5.8     0.2    -      -       -      +
    189A  ILE*     4.0    21.8    -      -       +      +
    204A  LEU*     3.8    14.6    -      -       -      +
    205A  ASP*     3.1    30.5    +      -       +      +
    206A  SER      3.2     0.4    -      -       -      -
    207A  LEU*     1.3    77.4    -      -       -      +
    209A  GLY*     1.3    56.1    +      -       -      +
    211A  LEU*     3.4     7.7    +      -       -      +
    212A  ASN*     2.7    54.5    +      -       -      +
----------------------------------------------------------
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Residues in contact with GLY 209 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    205A  ASP      3.5    11.2    +      -       -      -
    206A  SER      3.0     8.6    +      -       -      -
    208A  THR*     1.3    80.1    -      -       -      +
    210A  ILE*     1.3    61.7    +      -       -      +
    212A  ASN*     3.5    12.3    +      -       -      +
    213A  LYS*     3.7    16.1    +      -       -      +
----------------------------------------------------------
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Residues in contact with ILE 210 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     73A  LEU*     5.9     1.3    -      -       +      +
     74A  LEU*     4.7    11.0    -      -       +      -
     77A  LEU*     4.1    23.3    -      -       +      -
    206A  SER*     2.9    15.8    +      -       -      +
    207A  LEU*     3.2    12.1    +      -       +      +
    209A  GLY*     1.3    73.1    -      -       -      +
    211A  LEU*     1.3    70.1    +      -       +      +
    213A  LYS*     3.1     3.3    +      -       -      +
    214A  VAL*     3.0    38.9    +      -       +      +
     87B  LEU      4.2    27.1    -      -       -      +
     88B  LEU*     5.0     3.1    -      -       -      +
     91B  LEU*     3.6    42.8    -      -       +      -
----------------------------------------------------------
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Residues in contact with LEU 211 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     73A  LEU*     4.1    22.2    -      -       +      -
    139A  LEU*     3.8    32.3    -      -       +      -
    153A  LEU*     4.0    17.7    -      -       +      -
    155A  VAL*     4.3     3.4    -      -       +      -
    187A  LEU*     3.9     2.0    -      -       +      +
    189A  ILE*     3.7    32.1    -      -       +      -
    207A  LEU*     2.8    40.8    +      -       +      +
    208A  THR      3.6     4.7    -      -       -      +
    210A  ILE*     1.3    75.9    -      -       +      +
    212A  ASN*     1.3    60.0    +      -       -      +
    214A  VAL*     4.9     0.7    -      -       -      -
    215A  LEU*     3.0    42.7    +      -       +      +
    216A  PRO*     3.5     2.4    -      -       -      +
----------------------------------------------------------
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Residues in contact with ASN 212 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    187A  LEU*     3.7    17.2    -      -       -      +
    189A  ILE*     3.6    12.9    -      -       -      +
    208A  THR*     2.7    44.0    +      -       -      +
    209A  GLY*     3.7     9.6    -      -       -      +
    210A  ILE      3.1     0.8    -      -       -      -
    211A  LEU*     1.3    78.7    -      -       -      +
    213A  LYS*     1.3    81.5    +      -       +      +
    216A  PRO*     4.0    14.1    -      -       -      +
----------------------------------------------------------
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Residues in contact with LYS 213 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    209A  GLY      3.7    13.0    +      -       -      +
    210A  ILE*     3.1     3.7    +      -       -      +
    212A  ASN*     1.3    99.5    +      -       +      +
    214A  VAL*     1.3    64.5    +      -       +      +
    216A  PRO*     4.8     2.9    -      -       -      -
    217A  GLU*     4.3    13.5    -      -       -      +
----------------------------------------------------------
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Residues in contact with VAL 214 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     73A  LEU*     4.2    25.1    -      -       +      +
     76A  ILE*     5.1    15.3    -      -       +      +
     77A  LEU*     4.7    10.8    -      -       +      -
    210A  ILE*     3.0    31.9    +      -       +      +
    211A  LEU*     4.9     0.4    -      -       -      -
    212A  ASN      3.6     0.2    -      -       -      -
    213A  LYS*     1.3    84.2    -      -       +      +
    215A  LEU*     1.3    70.0    +      -       -      +
    216A  PRO*     3.4     2.5    -      -       -      -
    217A  GLU*     3.5     6.4    +      -       -      +
    218A  LEU*     3.1    30.8    +      -       +      +
----------------------------------------------------------
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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
----------------------------------------------------------
     71A  LEU*     4.1    14.6    -      -       +      -
     73A  LEU*     3.7    30.3    -      -       +      -
    137A  ILE*     4.6    11.0    -      -       +      -
    139A  LEU*     4.9     2.0    -      -       +      -
    155A  VAL*     3.6    33.9    -      -       +      -
    157A  LEU*     5.4     2.5    -      -       +      -
    187A  LEU*     4.7     7.6    -      -       +      -
    211A  LEU*     3.0    33.7    +      -       +      +
    214A  VAL*     1.3    77.9    -      -       -      +
    216A  PRO*     1.3    58.4    -      -       +      +
    218A  LEU*     2.9     7.3    +      -       +      -
    219A  VAL*     2.6    56.8    +      -       +      +
----------------------------------------------------------
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Residues in contact with PRO 216 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    157A  LEU*     4.0    21.1    -      -       +      -
    182A  HIS*     3.3    41.3    +      -       +      +
    187A  LEU*     4.1    18.6    -      -       +      -
    211A  LEU      3.5     9.4    -      -       -      +
    212A  ASN      4.0    13.5    -      -       -      +
    213A  LYS      4.8     1.1    -      -       -      -
    214A  VAL      3.7     3.6    -      -       -      +
    215A  LEU*     1.3    91.6    -      -       +      +
    217A  GLU*     1.3    57.7    +      -       +      +
    219A  VAL*     3.9     0.5    -      -       -      +
    220A  GLN*     2.9    30.8    +      -       -      +
----------------------------------------------------------
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Residues in contact with GLU 217 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    182A  HIS*     4.1    19.3    -      -       +      +
    213A  LYS      4.3    13.4    -      -       -      +
    214A  VAL      3.5     6.5    +      -       -      +
    215A  LEU      3.4     0.4    -      -       -      -
    216A  PRO*     1.3    78.7    -      -       +      +
    218A  LEU*     1.3    57.0    +      -       -      +
    220A  GLN*     3.9    11.8    -      -       -      +
    221A  GLY*     3.0    24.6    +      -       -      -
----------------------------------------------------------
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Residues in contact with LEU 218 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     71A  LEU*     4.0    16.6    -      -       +      +
     72A  PRO*     3.8    41.7    -      -       +      +
     73A  LEU*     3.8    26.7    -      -       +      +
     76A  ILE*     4.0    16.8    -      -       +      -
    214A  VAL*     3.1    22.0    +      -       +      +
    215A  LEU*     2.9    12.4    +      -       +      +
    217A  GLU*     1.3    76.9    -      -       -      +
    219A  VAL*     1.3    60.1    +      -       -      +
    221A  GLY      3.6     0.3    +      -       -      -
    222A  ASN*     2.4    44.9    +      -       -      +
----------------------------------------------------------
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Residues in contact with VAL 219 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     68A  LEU*     4.8     4.3    -      -       +      -
     71A  LEU*     3.7    29.2    -      -       +      -
    135A  LEU*     3.8    27.4    -      -       +      -
    137A  ILE*     6.0     1.6    -      -       +      -
    157A  LEU*     3.6    29.6    -      -       +      -
    159A  ILE*     3.8     7.4    -      -       +      -
    215A  LEU*     2.6    33.5    +      -       +      +
    216A  PRO      3.9     0.2    -      -       -      +
    218A  LEU*     1.3    69.9    -      -       -      +
    220A  GLN*     1.3    67.0    +      -       -      +
    222A  ASN*     3.0     2.6    +      -       -      -
    223A  VAL*     2.9    29.5    +      -       +      +
----------------------------------------------------------
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Residues in contact with GLN 220 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    159A  ILE*     3.9    12.1    -      -       +      +
    180A  CYS      3.5    27.2    +      -       -      +
    181A  THR*     3.3    11.9    -      -       -      +
    182A  HIS*     3.2    36.7    +      -       -      +
    216A  PRO      2.9    17.0    +      -       -      +
    217A  GLU*     3.9    10.6    -      -       -      +
    219A  VAL*     1.3    76.9    -      -       -      +
    221A  GLY*     1.3    60.9    +      -       -      +
    222A  ASN      3.1     0.3    +      -       -      -
    224A  CYS*     3.0    41.3    +      -       +      +
----------------------------------------------------------
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Residues in contact with GLY 221 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    217A  GLU      3.0    14.9    +      -       -      -
    218A  LEU      4.0     1.3    -      -       -      -
    219A  VAL      3.2     0.2    -      -       -      -
    220A  GLN*     1.3    81.5    -      -       -      +
    222A  ASN*     1.3    61.5    +      -       -      +
    224A  CYS*     5.4     0.4    -      -       -      -
    225A  PRO*     3.5    20.5    -      -       -      +
----------------------------------------------------------
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Residues in contact with ASN 222 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     67A  ILE*     3.5    40.5    -      -       +      +
     70A  ASN      5.8     0.3    -      -       -      -
     71A  LEU*     3.4    23.7    -      -       +      +
     72A  PRO*     4.3    10.2    -      -       -      +
    218A  LEU*     2.4    44.5    +      -       -      +
    219A  VAL      3.0     2.8    +      -       -      +
    221A  GLY*     1.3    81.4    -      -       -      +
    223A  VAL*     1.3    64.8    +      -       +      +
    224A  CYS      3.7     0.2    -      -       -      -
    225A  PRO*     4.1     5.2    -      -       -      +
    226A  LEU*     4.4     3.8    +      -       -      +
----------------------------------------------------------
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Residues in contact with VAL 223 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     59A  LEU*     5.0     3.1    -      -       +      -
     64A  LEU*     3.8    31.9    -      -       +      -
     67A  ILE*     4.9     2.0    -      -       +      -
     68A  LEU*     4.2     9.2    -      -       +      -
    133A  ILE*     5.0     7.6    -      -       +      -
    135A  LEU*     4.1     9.0    -      -       +      -
    159A  ILE*     4.3    20.2    -      -       +      -
    219A  VAL*     2.9    32.5    +      -       +      +
    222A  ASN*     1.3    82.8    -      -       +      +
    224A  CYS*     1.3    62.7    +      -       -      +
    225A  PRO      3.4     0.9    -      -       -      -
    226A  LEU*     2.9    11.7    +      -       +      +
    227A  VAL*     2.9    36.0    +      -       +      +
----------------------------------------------------------
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Residues in contact with CYS 224 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    159A  ILE*     3.9     9.2    -      -       -      -
    177A  LEU*     3.8     5.2    -      -       +      +
    180A  CYS*     2.1    68.6    -      -       +      -
    220A  GLN*     3.0    26.9    +      -       +      +
    221A  GLY*     5.4     0.4    -      -       -      -
    223A  VAL*     1.3    74.1    -      -       -      +
    225A  PRO*     1.3    70.7    -      -       +      +
    227A  VAL*     3.1     6.1    +      -       -      +
    228A  ASN*     2.9    21.8    +      -       -      +
----------------------------------------------------------
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Residues in contact with PRO 225 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    220A  GLN      3.9     0.7    -      -       -      +
    221A  GLY*     3.5    26.9    -      -       -      +
    222A  ASN      4.1     2.9    -      -       -      +
    223A  VAL      3.8     3.4    -      -       -      +
    224A  CYS*     1.3    92.3    -      -       +      +
    226A  LEU*     1.3    55.8    +      -       -      +
    228A  ASN*     3.1    10.8    +      -       +      +
    229A  GLU*     2.9    26.7    +      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 226 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     59A  LEU*     3.6    38.4    -      -       +      +
     62A  GLY*     3.8    29.8    -      -       -      +
     64A  LEU*     3.6    29.4    -      -       +      -
     67A  ILE*     3.9    19.5    -      -       +      -
    222A  ASN      4.4     2.3    +      -       -      +
    223A  VAL      2.9    12.0    +      -       -      +
    225A  PRO*     1.3    74.7    -      -       -      +
    227A  VAL*     1.3    61.3    +      -       -      +
    229A  GLU*     2.9    25.1    +      -       -      +
    230A  VAL*     2.8    34.3    +      -       +      +
----------------------------------------------------------
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Residues in contact with VAL 227 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     55A  LEU*     5.6     7.9    -      -       +      -
     59A  LEU*     4.1    16.6    -      -       +      -
    133A  ILE*     3.9    26.0    -      -       +      -
    159A  ILE*     5.1     0.2    -      -       +      -
    161A  ALA*     3.9    23.3    -      -       +      -
    163A  ILE*     6.3     1.3    -      -       +      -
    177A  LEU*     4.1    13.2    -      -       +      -
    180A  CYS*     4.6     5.6    -      -       -      -
    223A  VAL*     2.9    30.2    +      -       +      +
    224A  CYS*     3.1    11.2    +      -       -      +
    226A  LEU*     1.3    75.8    -      -       -      +
    228A  ASN*     1.3    63.1    +      -       -      +
    230A  VAL*     3.3     3.3    +      -       +      +
    231A  LEU*     3.0    29.7    +      -       +      +
----------------------------------------------------------
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Residues in contact with ASN 228 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    177A  LEU*     3.8    30.4    +      -       +      +
    224A  CYS      2.9    12.3    +      -       -      +
    225A  PRO*     3.4    12.5    +      -       +      +
    226A  LEU      3.1     0.2    -      -       -      -
    227A  VAL*     1.3    78.6    -      -       -      +
    229A  GLU*     1.3    64.3    +      -       -      +
    231A  LEU*     3.5     6.7    +      -       -      +
    232A  ARG*     3.3    21.2    +      -       -      +
----------------------------------------------------------
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Residues in contact with GLU 229 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     62A  GLY*     5.1     7.5    -      -       -      +
    225A  PRO      2.9    11.2    +      -       -      +
    226A  LEU*     2.9    28.8    +      -       +      +
    228A  ASN*     1.3    79.5    -      -       -      +
    230A  VAL*     1.3    65.4    +      -       +      +
    232A  ARG*     3.2     7.9    +      -       -      +
    233A  GLY*     3.1    18.7    +      -       -      -
----------------------------------------------------------
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Residues in contact with VAL 230 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     54A  ALA      4.4     2.9    -      -       -      +
     55A  LEU*     4.0    39.0    -      -       +      +
     58A  GLY*     3.6    36.1    -      -       -      +
     59A  LEU*     3.7    14.8    -      -       +      +
     62A  GLY*     5.6     0.4    -      -       -      -
    226A  LEU*     2.8    25.8    +      -       +      +
    227A  VAL*     3.7     6.1    -      -       -      +
    229A  GLU*     1.3    74.5    -      -       +      +
    231A  LEU*     1.3    67.2    +      -       -      +
    233A  GLY*     3.1    11.9    +      -       -      +
    234A  LEU*     3.3    15.9    +      -       +      +
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Residues in contact with LEU 231 (chain A). Click here for Legend to table.
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                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
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     51A  LEU*     5.4     0.9    -      -       +      -
     55A  LEU*     4.4     7.4    -      -       +      -
    163A  ILE*     3.8    29.6    -      -       +      -
    175A  LEU*     3.8    31.9    -      -       +      +
    176A  VAL      4.3     4.3    -      -       -      -
    177A  LEU*     3.5    50.5    -      -       +      +
    227A  VAL*     3.0    21.9    +      -       +      +
    228A  ASN*     3.7     7.0    -      -       -      +
    230A  VAL*     1.3    80.3    -      -       -      +
    232A  ARG*     1.3    63.4    +      -       -      +
    234A  LEU*     3.2    32.3    +      -       +      +
    239A  VAL*     4.4     5.0    -      -       -      +
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Residues in contact with ARG 232 (chain A). Click here for Legend to table.
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                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
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    228A  ASN*     3.3    10.1    +      -       -      +
    229A  GLU*     3.2    10.4    +      -       -      +
    231A  LEU*     1.3    79.1    -      -       -      +
    233A  GLY*     1.3    59.8    +      -       -      +
    234A  LEU      3.3     4.3    +      -       -      +
    236A  ILE*     5.4     4.5    -      -       -      +
    239A  VAL*     5.6     1.6    -      -       -      +
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Residues in contact with GLY 233 (chain A). Click here for Legend to table.
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                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
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    229A  GLU      3.1    12.8    +      -       -      -
    230A  VAL*     3.1     6.4    +      -       -      -
    232A  ARG*     1.3    76.1    -      -       -      +
    234A  LEU*     1.3    64.1    +      -       -      +
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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
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  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) +   -    +    +   +   +    +    -
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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