Contacts of the helix formed by residues 241 - 264 (chain A) in PDB entry 6UWZ


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 GLU 241 (chain A).
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    235A  LEU*     3.6    14.7    -      -       +      +
    239A  SER*     2.6    14.6    +      -       -      +
    240A  GLY*     1.3    81.0    -      -       -      +
    242A  LYS*     1.3    59.8    +      -       -      +
    243A  MET      3.4     1.6    -      -       -      -
    244A  THR*     3.8    10.3    -      -       -      +
    245A  LEU*     2.9    30.0    +      -       -      +
    255B  GLU*     3.4     1.3    -      -       -      -
    250E  GLN*     3.2    19.6    +      -       +      -
    251E  LYS      3.8     3.6    +      -       -      -
    252E  CYS*     3.3    24.9    +      -       +      +
    253E  THR*     2.6    40.2    +      -       -      +
    305E  LEU*     3.6    17.7    -      -       -      +
----------------------------------------------------------
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Residues in contact with LYS 242 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    232A  VAL*     3.5    18.7    +      -       +      +
    233A  PHE*     5.1     0.9    -      -       -      +
    235A  LEU*     2.5    31.5    +      -       +      +
    236A  PRO      4.2    10.1    -      -       -      +
    237A  THR*     3.6    31.3    +      -       +      +
    239A  SER      4.3     1.6    -      -       -      +
    241A  GLU*     1.3    77.4    -      -       -      +
    243A  MET*     1.3    59.2    +      -       -      +
    245A  LEU      3.3     1.0    +      -       -      -
    246A  SER*     2.8    35.4    +      -       -      -
    292A  THR*     3.6    24.7    -      -       +      +
    295A  VAL*     4.2     8.0    -      -       -      +
    296A  ILE*     4.1    15.5    -      -       +      -
    407A  ASP*     2.4    40.7    +      -       -      -
    255B  GLU*     3.1     1.4    +      -       -      +
----------------------------------------------------------
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Residues in contact with MET 243 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    242A  LYS*     1.3    69.4    -      -       -      +
    244A  THR*     1.3    67.8    +      -       -      +
    246A  SER*     4.5     1.1    -      -       -      +
    247A  ILE*     2.8    36.7    +      -       +      +
    289A  ILE*     3.6    33.2    -      -       +      +
    292A  THR*     3.3    28.0    -      -       +      -
    293A  VAL*     3.6    21.1    -      -       +      -
    296A  ILE*     3.3    13.9    -      -       +      -
    249B  LEU*     4.0     7.9    -      -       +      -
    255B  GLU*     2.8    46.0    +      -       +      +
    258B  SER*     6.0     1.6    -      -       -      -
    259B  THR*     4.0    19.5    -      -       +      +
----------------------------------------------------------
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Residues in contact with THR 244 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    240A  GLY      3.9    12.8    +      -       -      -
    241A  GLU*     3.6    15.7    -      -       +      +
    242A  LYS      3.3     0.2    -      -       -      -
    243A  MET*     1.3    78.4    -      -       -      +
    245A  LEU*     1.3    58.9    +      -       -      +
    247A  ILE*     4.1     2.3    -      -       -      +
    248A  SER*     2.8    43.0    +      -       -      +
    254B  GLY      5.6     0.2    +      -       -      -
    255B  GLU*     3.7     6.6    +      -       -      +
    258B  SER*     5.1    12.1    +      -       -      -
    252E  CYS      4.9     0.4    -      -       -      -
    253E  THR*     3.7    39.8    +      -       +      +
    256E  ILE*     4.6     1.8    -      -       +      -
    257E  SER*     6.1     0.2    -      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 245 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    228A  LEU*     4.7     4.0    -      -       +      +
    231A  LEU*     4.2    17.0    -      -       +      -
    232A  VAL*     3.7    34.3    -      -       +      +
    235A  LEU*     4.5     4.9    -      -       +      -
    241A  GLU      2.9    18.8    +      -       -      +
    242A  LYS      3.7     3.4    -      -       -      +
    244A  THR*     1.3    79.8    -      -       -      +
    246A  SER*     1.3    63.9    +      -       -      +
    248A  SER*     3.8     3.5    -      -       -      -
    249A  VAL*     2.9    32.3    +      -       +      +
    252E  CYS*     4.2    14.4    -      -       +      -
    256E  ILE*     3.5    33.9    -      -       +      -
    298E  VAL*     3.7    16.2    -      -       +      -
    302E  VAL*     4.2     9.9    -      -       +      -
----------------------------------------------------------
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Residues in contact with SER 246 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    229A  THR*     6.3     2.2    -      -       -      +
    232A  VAL*     3.2    26.2    -      -       -      +
    242A  LYS      2.8    19.5    +      -       -      -
    243A  MET*     4.1     4.9    -      -       -      -
    245A  LEU*     1.3    76.0    -      -       -      +
    247A  ILE*     1.3    58.0    +      -       -      +
    249A  VAL*     3.2    10.1    +      -       -      +
    250A  LEU*     3.0    26.3    +      -       -      +
    285A  VAL*     4.0     4.2    -      -       -      +
    288A  SER*     4.9     2.5    -      -       -      -
    289A  ILE*     3.4    32.0    -      -       -      +
    292A  THR*     3.9     6.8    +      -       -      +
----------------------------------------------------------
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Residues in contact with ILE 247 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    243A  MET*     2.8    34.6    +      -       +      +
    244A  THR*     4.2     2.0    -      -       -      +
    246A  SER*     1.3    74.9    -      -       -      +
    248A  SER*     1.3    58.1    +      -       -      +
    250A  LEU*     3.2    12.2    +      -       +      +
    251A  LEU*     2.9    27.9    +      -       +      +
    289A  ILE*     3.8    30.1    -      -       +      -
    242B  LEU*     4.7     8.3    -      -       +      -
    258B  SER      4.8     1.8    -      -       -      +
    259B  THR*     4.1    28.9    -      -       +      +
    262B  SER*     3.1    39.7    -      -       -      +
    263B  VAL*     5.0     4.3    -      -       +      +
----------------------------------------------------------
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Residues in contact with SER 248 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    244A  THR*     2.8    27.2    +      -       -      +
    247A  ILE*     1.3    75.9    -      -       -      +
    249A  VAL*     1.3    59.6    +      -       -      +
    251A  LEU*     3.7    10.8    -      -       -      +
    252A  SER*     2.9    35.1    +      -       -      -
    256E  ILE*     3.3    37.6    -      -       -      +
    257E  SER*     5.1     2.3    +      -       -      -
    260E  LEU*     4.9     7.2    -      -       -      +
----------------------------------------------------------
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Residues in contact with VAL 249 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    225A  PHE*     3.5    27.1    -      -       +      +
    228A  LEU*     3.9    21.8    -      -       +      +
    229A  THR*     3.5    25.6    -      -       -      +
    245A  LEU*     2.9    25.7    +      -       +      +
    246A  SER*     3.4    10.3    -      -       -      +
    248A  SER*     1.3    75.2    -      -       -      +
    250A  LEU*     1.3    57.1    +      -       -      +
    252A  SER*     3.4     6.6    +      -       -      -
    253A  LEU*     2.9    27.9    +      -       -      +
    285A  VAL*     4.1     9.0    -      -       +      -
    256E  ILE*     3.8    20.6    -      -       +      -
    259E  LEU*     5.6     0.7    -      -       -      -
----------------------------------------------------------
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Residues in contact with LEU 250 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    246A  SER      3.0    13.1    +      -       -      +
    247A  ILE*     3.3    16.8    -      -       +      +
    248A  SER      3.2     0.2    -      -       -      -
    249A  VAL*     1.3    77.9    -      -       -      +
    251A  LEU*     1.3    55.6    +      -       +      +
    253A  LEU*     3.3     6.1    +      -       -      +
    254A  THR*     2.7    39.0    +      -       -      +
    282A  MET*     4.8     6.1    -      -       -      +
    285A  VAL*     3.7    13.2    -      -       +      +
    286A  ILE*     3.8    17.7    -      -       +      -
    289A  ILE*     3.3    26.9    -      -       +      -
    239B  ILE*     4.0    34.3    -      -       +      -
    242B  LEU*     3.5    18.8    -      -       +      -
    262B  SER      5.5     0.9    -      -       -      +
    263B  VAL*     5.9     2.0    -      -       +      -
    266B  ALA*     4.5     7.6    -      -       +      -
----------------------------------------------------------
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Residues in contact with LEU 251 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    247A  ILE*     2.9    19.3    +      -       +      +
    248A  SER*     3.7    10.3    -      -       -      +
    250A  LEU*     1.3    76.8    -      -       +      +
    252A  SER*     1.3    64.4    +      -       -      +
    254A  THR*     3.1     5.1    +      -       -      +
    255A  VAL*     2.9    29.7    +      -       +      +
    262B  SER*     3.4    36.3    -      -       -      +
    265B  LEU*     4.2    24.9    -      -       +      -
    266B  ALA*     3.8    24.9    -      -       +      +
    269B  VAL*     5.9     2.0    -      -       +      -
    257C  LEU*     6.2     1.6    -      -       +      -
    260E  LEU*     4.0    24.2    -      -       +      -
----------------------------------------------------------
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Residues in contact with SER 252 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    225A  PHE*     3.6    26.0    -      -       -      -
    248A  SER      2.9    18.1    +      -       -      -
    249A  VAL*     3.7     4.5    -      -       -      -
    251A  LEU*     1.3    75.6    -      -       -      +
    253A  LEU*     1.3    58.2    +      -       -      +
    255A  VAL*     3.4     1.1    +      -       -      -
    256A  PHE*     2.9    24.1    +      -       -      +
    256E  ILE      4.5     1.2    +      -       -      -
    259E  LEU*     4.4     6.0    -      -       -      +
    260E  LEU*     3.4    35.2    +      -       -      +
    263E  THR*     3.4    19.5    -      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 253 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    222A  CYS*     4.4     3.4    -      -       -      -
    225A  PHE*     3.4    31.4    -      -       +      -
    249A  VAL      2.9    17.6    +      -       -      +
    250A  LEU      3.6     4.9    -      -       -      +
    252A  SER*     1.3    76.5    -      -       -      +
    254A  THR*     1.3    58.2    +      -       -      +
    256A  PHE*     3.3     3.5    +      -       +      +
    257A  LEU*     2.8    22.9    +      -       -      +
    278A  MET*     3.2    41.6    -      -       +      +
    281A  THR*     3.9    19.3    -      -       +      +
    282A  MET*     3.6    49.1    -      -       +      +
    285A  VAL*     3.9    11.0    -      -       +      -
----------------------------------------------------------
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Residues in contact with THR 254 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    250A  LEU*     2.7    30.4    +      -       -      +
    251A  LEU*     3.1    10.5    +      -       -      -
    253A  LEU*     1.3    75.0    -      -       -      +
    255A  VAL*     1.3    59.4    +      -       -      +
    257A  LEU*     3.2     9.4    +      -       +      +
    258A  LEU*     2.9    24.9    +      -       -      +
    282A  MET*     4.4     6.8    -      -       -      +
    239B  ILE*     4.3     7.6    -      -       -      +
    266B  ALA*     4.2     8.7    -      -       +      +
    269B  VAL*     3.8    26.1    -      -       +      +
    270B  PHE*     3.7    35.0    -      -       +      -
    273B  LEU*     5.3     0.5    -      -       -      +
----------------------------------------------------------
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Residues in contact with VAL 255 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    251A  LEU*     2.9    16.0    +      -       +      +
    252A  SER*     3.7     6.1    -      -       -      +
    254A  THR*     1.3    76.2    -      -       -      +
    256A  PHE*     1.3    58.1    +      -       -      +
    258A  LEU*     3.0    35.8    +      -       +      +
    259A  VAL*     3.0     9.2    +      -       -      +
    269B  VAL*     5.0    14.6    -      -       +      -
    260E  LEU*     4.0    15.9    -      -       +      -
    263E  THR*     4.3    11.7    -      -       +      +
    264E  ILE*     4.0    33.9    -      -       +      -
    267E  PHE*     4.8     9.1    -      -       +      +
----------------------------------------------------------
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Residues in contact with PHE 256 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    217A  ASN      2.9    28.9    -      -       -      -
    218A  VAL*     3.0    28.0    -      -       -      -
    221A  PRO*     3.4    34.8    -      -       +      -
    222A  CYS*     3.9    12.8    -      -       -      -
    225A  PHE*     3.8    13.5    -      +       +      -
    252A  SER      2.9    17.6    +      -       -      +
    253A  LEU*     3.6     5.6    -      -       -      +
    254A  THR      3.2     0.4    -      -       -      -
    255A  VAL*     1.3    75.2    -      -       -      +
    257A  LEU*     1.3    60.6    +      -       -      +
    259A  VAL*     3.0    22.8    -      -       +      +
    260A  ILE*     2.8    50.1    +      -       +      +
    278A  MET*     4.4     2.7    -      -       +      -
    263E  THR*     4.1    13.9    -      -       +      +
    266E  LEU*     3.9    11.7    -      -       +      -
----------------------------------------------------------
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Residues in contact with LEU 257 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    253A  LEU      2.8    13.9    +      -       -      +
    254A  THR*     3.3     9.9    -      -       +      +
    256A  PHE*     1.3    75.4    -      -       -      +
    258A  LEU*     1.3    57.9    +      -       -      +
    260A  ILE*     3.5     8.3    -      -       +      +
    261A  VAL*     2.9    35.4    +      -       +      +
    278A  MET*     3.5    25.4    -      -       +      +
    282A  MET*     4.4    11.9    -      -       +      -
    230B  ILE      5.4     0.7    -      -       -      +
    231B  ASN*     3.3    54.3    -      -       +      +
    235B  PRO*     4.4     4.7    -      -       +      -
    270B  PHE*     3.4    29.2    -      -       +      -
    273B  LEU*     4.7     4.9    -      -       +      -
----------------------------------------------------------
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Residues in contact with LEU 258 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    254A  THR      2.9    12.9    +      -       -      +
    255A  VAL*     3.0    20.4    +      -       +      +
    257A  LEU*     1.3    78.4    -      -       -      +
    259A  VAL*     1.3    58.9    +      -       -      +
    261A  VAL*     3.6    10.4    +      -       -      +
    262A  GLU*     3.7     9.7    +      -       -      +
    269B  VAL*     3.8    20.2    -      -       +      -
    272B  LEU*     4.0    20.9    -      -       +      -
    273B  LEU*     3.4    37.2    -      -       +      +
    264C  LEU*     5.9     1.3    -      -       +      -
    267E  PHE*     3.2    53.7    -      -       +      -
----------------------------------------------------------
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Residues in contact with VAL 259 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    217A  ASN      4.9     2.0    -      -       -      +
    218A  VAL*     6.1     0.2    -      -       +      -
    255A  VAL      3.0     5.2    +      -       -      +
    256A  PHE*     3.0    49.8    -      -       +      +
    258A  LEU*     1.3    74.6    -      -       -      +
    260A  ILE*     1.3    62.6    +      -       +      +
    262A  GLU*     2.9    18.4    +      -       -      +
    263A  LEU*     3.0    22.0    +      -       +      +
    263E  THR      5.9     0.7    -      -       -      +
    266E  LEU*     4.6     5.8    -      -       +      +
    267E  PHE*     3.6    36.6    -      -       +      -
    270E  ALA*     3.7    29.8    -      -       +      -
----------------------------------------------------------
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Residues in contact with ILE 260 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    218A  VAL*     3.7    28.7    -      -       +      +
    222A  CYS*     4.7     0.4    -      -       -      -
    256A  PHE*     2.8    37.5    +      -       +      +
    257A  LEU*     3.2    16.4    +      -       +      +
    259A  VAL*     1.3    77.9    -      -       +      +
    261A  VAL*     1.3    59.0    +      -       +      +
    263A  LEU*     4.4     2.7    -      -       -      +
    264A  ILE*     2.8    55.5    +      -       +      +
    274A  ILE*     5.5     2.5    -      -       +      +
    278A  MET*     3.3    41.3    -      -       +      -
    227B  PHE*     6.3     1.1    -      -       +      -
    231B  ASN*     4.6     9.0    -      -       -      +
----------------------------------------------------------
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Residues in contact with VAL 261 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    257A  LEU*     2.9    24.9    +      -       +      +
    258A  LEU*     3.7     8.5    -      -       -      +
    259A  VAL      3.2     0.4    -      -       -      -
    260A  ILE*     1.3    77.0    -      -       +      +
    262A  GLU*     1.3    57.3    +      -       +      +
    264A  ILE*     3.9    11.5    -      -       -      +
    266A  SER*     4.2     2.6    +      -       -      -
    227B  PHE*     4.1    20.9    -      -       +      -
    231B  ASN*     4.6    11.4    -      -       +      -
    232B  PHE*     4.2    20.6    -      -       +      -
    273B  LEU*     4.6    15.0    -      -       +      +
    276B  GLN*     5.6     6.7    -      -       -      +
    277B  ARG*     3.3    34.5    +      -       -      +
----------------------------------------------------------
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Residues in contact with GLU 262 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    258A  LEU      3.7     6.9    +      -       -      +
    259A  VAL*     2.9    10.9    +      -       -      +
    261A  VAL*     1.3    81.1    -      -       +      +
    263A  LEU*     1.3    71.4    +      -       +      +
    264A  ILE      3.5     2.0    +      -       -      +
    267E  PHE*     3.0    30.1    -      -       -      -
    270E  ALA      5.5     0.4    -      -       -      -
    271E  GLN*     3.3    29.7    -      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 263 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    213A  TYR*     4.1    25.5    -      -       +      +
    214A  PHE*     3.2    25.0    -      -       +      -
    217A  ASN*     3.9    25.1    -      -       +      +
    218A  VAL*     4.3    18.8    -      -       +      -
    259A  VAL*     3.0    22.8    +      -       +      +
    260A  ILE      4.4     1.1    -      -       -      +
    262A  GLU*     1.3    91.7    -      -       +      +
    264A  ILE*     1.3    60.5    +      -       +      +
    265A  PRO*     4.4     0.7    -      -       -      +
     46E  LYS*     5.5     1.6    -      -       -      +
    270E  ALA*     3.7    42.2    -      -       +      +
----------------------------------------------------------
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Residues in contact with ILE 264 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    135A  PHE*     3.7    11.7    -      -       +      -
    214A  PHE*     3.8    10.3    -      -       +      -
    218A  VAL*     3.9    15.3    -      -       +      -
    260A  ILE*     2.8    39.2    +      -       +      +
    261A  VAL*     3.9    13.3    -      -       -      +
    262A  GLU      3.5     1.6    -      -       -      +
    263A  LEU*     1.3    87.5    -      -       -      +
    265A  PRO*     1.3    85.6    -      -       +      +
    266A  SER*     3.4     4.5    +      -       -      -
    272A  PRO*     5.0     7.4    -      -       +      -
    274A  ILE*     3.1    41.3    -      -       +      -
    227B  PHE*     5.0     6.6    -      -       +      -
----------------------------------------------------------
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A short description of the analytical approach
The contact analysis used in this page is based upon the approach developed in: Sobolev V., Wade R.C., Vriend G. and Edelman M. PROTEINS (1996) 25, 120-129. Contact legitimacy depends on the hydrophobic-hydrophilic properties of the contacting atoms. In order to define it, for each inter-atomic contact, eight atom classes have been introduced:


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

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

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