Contacts of the helix formed by residues 244 - 270 (chain G) in PDB entry 2QJK


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 PHE 244 (chain G).
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     32G  THR      4.6     4.3    -      -       -      -
     33G  ILE*     3.4    33.2    -      -       +      +
     34G  MET      3.6     2.0    +      -       -      -
     35G  ILE*     3.0    31.3    +      -       +      +
     37G  THR*     3.9     7.9    -      -       -      -
    242G  VAL      3.5     0.6    +      -       -      -
    243G  PRO*     1.3    70.0    -      -       -      +
    245G  TRP*     1.3    57.5    +      -       -      +
    247G  TYR      3.2     0.7    +      -       -      -
    248G  PHE*     2.7    70.0    +      +       +      -
    249G  ILE*     3.4    28.4    +      -       +      -
    252G  ASP*     3.7    11.7    -      -       -      -
    505G  ANJ      3.5    61.5    -      +       +      -
----------------------------------------------------------
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Residues in contact with TRP 245 (chain G). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     33G  ILE*     3.2    26.9    +      -       +      +
     34G  MET*     3.6    24.0    -      -       +      +
    243G  PRO*     3.3    22.6    -      -       -      +
    244G  PHE*     1.3    78.2    -      -       -      +
    246G  PRO*     1.3    87.1    -      -       +      +
    247G  TYR      3.4     0.7    -      -       -      -
    249G  ILE*     3.7    40.2    -      -       +      -
    250G  ILE*     5.7     3.6    -      -       +      -
----------------------------------------------------------
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Residues in contact with PRO 246 (chain G). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    243G  PRO*     4.8     0.7    -      -       +      -
    244G  PHE      3.4     1.3    -      -       -      -
    245G  TRP*     1.3   122.0    -      -       +      +
    247G  TYR*     1.3    82.1    +      -       +      +
    248G  PHE      3.4     2.5    -      -       -      -
    249G  ILE*     4.1     0.7    -      -       +      -
    250G  ILE*     3.0    33.8    +      -       +      +
    251H  LEU*     3.6    25.8    -      -       +      -
----------------------------------------------------------
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Residues in contact with TYR 247 (chain G). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    242G  VAL*     3.7    20.9    -      -       +      -
    243G  PRO*     3.2    51.6    -      -       +      +
    244G  PHE      3.2     1.0    +      -       -      -
    246G  PRO*     1.3    87.5    -      -       +      +
    248G  PHE*     1.3    61.3    +      -       -      +
    250G  ILE*     3.9     3.1    -      -       -      +
    251G  LYS      3.5     9.4    +      -       -      -
    248H  ASN*     4.2     0.2    -      -       -      +
    251H  LEU*     3.2    48.6    +      -       +      +
    252H  TRP*     3.2    41.8    +      +       +      +
    254H  GLY      5.2     1.6    +      -       -      -
    255H  VAL*     3.8    21.0    -      -       +      +
----------------------------------------------------------
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Residues in contact with PHE 248 (chain G). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     37G  THR*     3.2    34.1    -      -       +      -
     38G  PRO      3.2    22.2    -      -       -      -
     39G  ARG      4.6     1.1    -      -       -      -
     41G  LEU*     3.8    18.4    -      -       +      -
    242G  VAL*     4.1    10.3    -      -       +      -
    244G  PHE*     2.7    52.4    +      +       +      -
    247G  TYR*     1.3    71.6    -      -       -      +
    249G  ILE*     1.3    65.4    +      -       -      +
    250G  ILE      2.6     6.3    +      -       -      -
    251G  LYS*     2.7    40.1    +      -       +      +
    252G  ASP*     2.7    25.9    +      -       -      +
    505G  ANJ      3.5    17.0    -      -       -      -
    252H  TRP*     3.6    21.1    -      +       -      -
----------------------------------------------------------
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Residues in contact with ILE 249 (chain G). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     33G  ILE*     3.3    30.3    -      -       +      -
    244G  PHE*     3.4    24.4    +      -       +      -
    245G  TRP*     3.7    43.1    -      -       +      -
    246G  PRO      3.8     7.4    -      -       -      +
    248G  PHE*     1.3    76.4    -      -       -      +
    250G  ILE*     1.3    60.9    +      -       +      +
    252G  ASP*     3.5     8.2    -      -       +      +
    253G  VAL*     3.0    33.9    +      -       +      +
    505G  ANJ      4.4     9.9    -      -       +      -
----------------------------------------------------------
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Residues in contact with ILE 250 (chain G). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    245G  TRP*     5.7     3.1    -      -       +      -
    246G  PRO*     3.0    24.8    +      -       +      +
    247G  TYR      3.9     3.1    -      -       -      +
    248G  PHE      2.6     5.1    +      -       -      -
    249G  ILE*     1.3    76.9    -      -       +      +
    251G  LYS*     1.3    54.8    +      -       -      +
    252G  ASP      3.0     1.1    -      -       -      -
    253G  VAL*     2.9     7.9    +      -       +      +
    254G  PHE      2.5    33.4    +      -       -      -
    244H  LEU*     4.6    13.0    -      -       +      +
    247H  THR*     4.2    21.8    -      -       +      -
    248H  ASN*     3.4    34.1    -      -       +      +
    251H  LEU*     3.7    23.1    -      -       +      -
     16I  TYR*     6.0     4.7    -      -       +      +
----------------------------------------------------------
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Residues in contact with LYS 251 (chain G). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     41G  LEU      3.2    25.1    +      -       -      -
     42G  ASN*     4.1    14.4    +      -       -      +
     43G  TRP*     4.2    29.1    -      -       +      +
     46G  ILE*     4.9     3.8    -      -       +      -
    247G  TYR      3.5     3.3    +      -       -      +
    248G  PHE*     2.7    54.5    +      -       +      +
    250G  ILE*     1.3    75.7    -      -       -      +
    252G  ASP*     1.3    54.2    +      -       -      +
    254G  PHE*     3.3     7.8    -      -       -      +
    255G  ALA*     2.6    38.2    +      -       -      +
    505G  ANJ      4.1    12.9    +      -       -      +
    248H  ASN*     3.6    22.4    -      -       -      +
    252H  TRP*     4.2    12.4    -      -       +      +
----------------------------------------------------------
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Residues in contact with ASP 252 (chain G). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     46G  ILE*     4.6     6.5    -      -       -      +
     49G  VAL*     3.3    28.1    -      -       +      +
    244G  PHE*     3.7    11.1    -      -       -      -
    248G  PHE      2.7    15.5    +      -       -      +
    249G  ILE*     3.5     8.4    -      -       -      +
    251G  LYS*     1.3    79.3    -      -       -      +
    253G  VAL*     1.3    53.9    +      -       +      +
    255G  ALA*     3.5     4.5    -      -       -      +
    256G  LEU*     2.6    39.7    +      -       -      +
    505G  ANJ      2.5    59.6    +      -       +      +
----------------------------------------------------------
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Residues in contact with VAL 253 (chain G). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    249G  ILE*     3.0    24.0    -      -       +      +
    250G  ILE*     2.9     9.7    +      -       +      +
    252G  ASP*     1.3    80.2    -      -       +      +
    254G  PHE*     1.3    65.5    +      -       -      +
    256G  LEU*     3.3    14.3    +      -       +      +
    257G  ALA*     3.0    22.1    +      -       +      +
    240H  LEU*     6.5     0.2    -      -       +      -
    244H  LEU*     3.7    26.9    -      -       +      -
----------------------------------------------------------
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Residues in contact with PHE 254 (chain G). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     43G  TRP*     3.6    36.6    -      +       -      -
    250G  ILE      2.5    18.1    +      -       -      +
    251G  LYS*     3.3     9.4    -      -       -      +
    253G  VAL*     1.3    76.5    -      -       -      +
    255G  ALA*     1.3    64.5    +      -       -      +
    257G  ALA*     3.0    14.2    +      -       -      +
    258G  VAL*     3.3    29.2    +      -       +      +
    241H  SER*     3.7    22.4    -      -       -      -
    244H  LEU*     4.0    25.3    -      -       +      +
    245H  TYR*     3.9    39.9    -      +       +      -
    248H  ASN*     4.5    12.6    -      -       +      -
----------------------------------------------------------
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Residues in contact with ALA 255 (chain G). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     43G  TRP*     4.4     9.2    -      -       +      -
     46G  ILE*     3.7    40.6    -      -       +      -
     50G  VAL*     5.9     0.7    -      -       +      -
    251G  LYS      2.6    19.3    +      -       -      +
    252G  ASP      3.5     2.9    -      -       -      +
    254G  PHE*     1.3    75.6    -      -       -      +
    256G  LEU*     1.3    67.3    +      -       -      +
    258G  VAL*     2.7    24.9    +      -       -      +
    259G  VAL*     2.9    15.7    +      -       +      +
----------------------------------------------------------
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Residues in contact with LEU 256 (chain G). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     49G  VAL*     3.3    31.4    -      -       +      -
     50G  VAL*     4.0    22.6    -      -       +      +
     53G  PHE*     4.1    34.1    -      -       +      -
    252G  ASP      2.6    19.5    +      -       -      +
    253G  VAL*     3.3    18.2    -      -       +      +
    255G  ALA*     1.3    71.7    -      -       -      +
    257G  ALA*     1.3    60.7    +      -       -      +
    259G  VAL*     3.5     7.1    -      -       +      +
    260G  LEU*     3.0    38.6    +      -       +      +
----------------------------------------------------------
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Residues in contact with ALA 257 (chain G). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    253G  VAL*     3.0    12.1    +      -       +      +
    254G  PHE      3.1    11.4    -      -       -      +
    255G  ALA      2.8     4.0    +      -       -      -
    256G  LEU*     1.3    71.5    -      -       -      +
    258G  VAL*     1.3    59.9    +      -       -      +
    260G  LEU*     3.1     5.4    +      -       -      +
    261G  LEU*     2.8    29.8    +      -       -      +
    237H  LEU*     3.9    19.9    -      -       +      +
    240H  LEU*     4.8     3.8    -      -       +      -
    241H  SER*     4.0    17.9    -      -       -      +
    244H  LEU*     4.0    19.3    -      -       +      -
----------------------------------------------------------
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Residues in contact with VAL 258 (chain G). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    254G  PHE*     3.4    44.0    -      -       +      +
    255G  ALA*     2.7    15.1    +      -       -      +
    257G  ALA*     1.3    71.7    -      -       -      +
    259G  VAL*     1.3    64.1    +      -       +      +
    261G  LEU*     3.1    28.1    -      -       +      +
    262G  VAL*     3.2    15.0    +      -       +      +
    241H  SER*     4.1    11.0    +      -       -      +
----------------------------------------------------------
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Residues in contact with VAL 259 (chain G). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     46G  ILE*     4.7     9.9    -      -       +      -
     47G  TRP*     5.1     8.3    -      -       +      -
     50G  VAL*     3.9    36.3    -      -       +      -
    103G  LEU*     4.1    22.7    -      -       +      -
    255G  ALA*     2.9    20.1    +      -       -      +
    256G  LEU*     3.5    10.3    -      -       +      +
    258G  VAL*     1.3    78.3    -      -       +      +
    260G  LEU*     1.3    56.3    +      -       +      +
    262G  VAL*     2.9    11.6    +      -       -      +
    263G  PHE*     2.8    30.5    +      -       -      +
    504G  LOP      4.6    13.4    -      -       +      +
----------------------------------------------------------
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Residues in contact with LEU 260 (chain G). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     53G  PHE*     3.3    54.7    -      -       +      -
    103G  LEU*     4.9     5.2    -      -       +      -
    256G  LEU*     3.0    27.7    +      -       +      +
    257G  ALA*     3.6     6.1    -      -       -      +
    259G  VAL*     1.3    77.8    -      -       +      +
    261G  LEU*     1.3    59.4    +      -       -      +
    263G  PHE*     3.7    21.3    -      -       +      -
    264G  PHE*     2.7    54.3    +      -       +      -
    237H  LEU*     4.1    13.2    -      -       +      -
----------------------------------------------------------
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Residues in contact with LEU 261 (chain G). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    257G  ALA      2.8    12.7    +      -       -      +
    258G  VAL*     3.1    20.0    -      -       +      +
    259G  VAL      3.1     0.2    -      -       -      -
    260G  LEU*     1.3    78.7    -      -       -      +
    262G  VAL*     1.3    66.1    +      -       +      +
    264G  PHE*     3.9     2.4    -      -       -      +
    265G  ALA*     3.0    21.8    +      -       +      +
    234H  VAL*     3.4    44.7    -      -       +      +
    237H  LEU*     4.0    14.1    -      -       +      +
    238H  THR*     3.6    27.8    -      -       +      +
    241H  SER*     4.2     9.6    -      -       -      +
----------------------------------------------------------
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Residues in contact with VAL 262 (chain G). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    258G  VAL*     3.3    20.6    -      -       +      +
    259G  VAL*     2.9     6.2    +      -       -      +
    261G  LEU*     1.3    77.2    -      -       +      +
    263G  PHE*     1.3    69.4    +      -       -      +
    265G  ALA*     3.0    23.5    +      -       +      +
    266G  ILE*     3.1    21.7    +      -       +      +
    504G  LOP      4.5    27.1    -      -       +      -
----------------------------------------------------------
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Residues in contact with PHE 263 (chain G). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     53G  PHE*     5.2     0.4    -      +       -      -
     57G  LEU*     3.8    19.3    -      -       +      -
     96G  LEU*     3.4    47.8    -      -       +      -
     99G  ASN*     3.7    26.2    -      -       +      -
    100G  GLY*     4.1     3.6    -      -       -      -
    103G  LEU*     4.1    13.9    -      -       +      -
    259G  VAL      2.8    18.0    +      -       -      +
    260G  LEU*     3.4    28.7    -      -       +      +
    262G  VAL*     1.3    71.5    -      -       -      +
    264G  PHE*     1.3    74.7    +      +       -      +
    266G  ILE*     3.0    13.2    +      -       -      +
    267G  VAL*     2.9    31.5    +      -       +      +
    504G  LOP      3.4    29.5    -      -       +      +
----------------------------------------------------------
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Residues in contact with PHE 264 (chain G). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     53G  PHE*     5.6     4.0    -      +       -      -
     57G  LEU*     6.6     0.2    -      -       +      -
     92G  MET*     5.5     8.7    -      -       -      -
     96G  LEU*     4.2    31.9    -      -       +      -
    260G  LEU*     2.7    49.7    +      -       +      +
    261G  LEU      3.9     2.7    -      -       -      +
    263G  PHE*     1.3    82.4    -      +       -      +
    265G  ALA*     1.3    53.9    +      -       -      +
    267G  VAL*     3.7     8.5    -      -       +      +
    268G  GLY*     2.6    35.7    +      -       -      -
    230H  GLY*     5.3     2.4    -      -       -      -
    233H  ALA*     3.7    32.8    -      -       +      -
    234H  VAL*     5.2     2.7    -      -       +      +
    237H  LEU*     3.8    18.4    -      -       +      -
----------------------------------------------------------
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Residues in contact with ALA 265 (chain G). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    261G  LEU*     3.0    16.3    +      -       +      +
    262G  VAL*     3.0    20.6    -      -       +      +
    264G  PHE*     1.3    75.1    -      -       -      +
    266G  ILE*     1.3    54.1    +      -       +      +
    269G  PHE*     2.8    52.1    +      -       +      +
    270G  MET*     4.7     0.7    -      -       -      +
    431G  BGL      5.3    13.4    -      -       +      +
    234H  VAL*     4.5    12.7    -      -       +      +
----------------------------------------------------------
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Residues in contact with ILE 266 (chain G). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     99G  ASN*     4.1    16.8    -      -       -      +
    262G  VAL*     3.1    27.4    -      -       +      +
    263G  PHE*     3.0     9.8    +      -       -      +
    265G  ALA*     1.3    75.6    -      -       +      +
    267G  VAL*     1.3    60.7    +      -       +      +
    268G  GLY      3.0     1.8    -      -       -      -
    270G  MET*     2.6    79.5    +      -       +      +
    271G  PRO      2.9     0.7    -      -       -      -
    273G  TYR*     5.4     1.1    -      -       +      -
    274G  LEU*     5.1     9.9    -      -       +      -
    504G  LOP      4.4    21.1    -      -       +      -
----------------------------------------------------------
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Residues in contact with VAL 267 (chain G). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     92G  MET*     4.3    12.7    -      -       -      +
     95G  TYR*     3.9    26.1    -      -       +      +
     96G  LEU*     4.0    25.6    -      -       +      +
     99G  ASN*     4.3     8.1    -      -       +      +
    263G  PHE*     2.9    52.2    +      -       +      +
    264G  PHE*     3.7     9.4    -      -       +      +
    266G  ILE*     1.3    73.6    -      -       +      +
    268G  GLY*     1.3    61.8    +      -       -      +
    271G  PRO*     3.7    19.5    -      -       -      +
    226H  ARG*     3.9    10.7    -      -       -      +
----------------------------------------------------------
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Residues in contact with GLY 268 (chain G). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     92G  MET*     5.3     3.6    -      -       -      -
    264G  PHE      2.6    21.9    +      -       -      -
    265G  ALA      3.9     0.2    -      -       -      -
    267G  VAL*     1.3    75.1    -      -       -      +
    269G  PHE*     1.3    64.3    +      -       -      +
    226H  ARG*     3.0    47.9    +      -       -      +
    227H  LYS*     4.4     1.9    -      -       -      +
    230H  GLY*     4.4    11.4    -      -       -      -
----------------------------------------------------------
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Residues in contact with PHE 269 (chain G). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    265G  ALA*     2.8    35.8    +      -       +      +
    268G  GLY*     1.3    78.2    -      -       -      +
    270G  MET*     1.3    57.5    +      -       +      +
    271G  PRO*     3.6     4.5    -      -       -      +
    431G  BGL      2.7    67.0    +      -       +      +
     16H  PRO*     3.5    42.4    -      -       +      -
    226H  ARG*     3.8     5.9    +      -       -      +
    227H  LYS*     4.0    20.4    -      -       +      -
    230H  GLY*     4.1     6.7    -      -       -      -
    231H  PHE*     3.7    31.2    -      +       -      -
    234H  VAL*     4.2    22.7    -      -       +      -
----------------------------------------------------------
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Residues in contact with MET 270 (chain G). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     99G  ASN*     4.7     0.2    -      -       -      +
    265G  ALA      4.7     0.7    -      -       -      +
    266G  ILE*     2.6    54.5    +      -       +      +
    269G  PHE*     1.3    76.9    -      -       +      +
    271G  PRO*     1.3    65.5    -      -       -      +
    272G  ASN      3.3     2.7    -      -       -      +
    273G  TYR*     3.3    53.0    +      -       +      +
    431G  BGL      4.2    31.0    -      -       -      +
    121H  LEU*     3.7    28.9    -      -       +      +
----------------------------------------------------------
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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