Contacts of the helix formed by residues 244 - 270 (chain J) 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 J).
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     32J  THR      4.6     4.5    -      -       -      -
     33J  ILE*     3.4    33.9    -      -       +      +
     34J  MET      4.0     2.0    +      -       -      -
     35J  ILE*     3.0    31.8    +      -       +      +
     37J  THR*     4.0     7.6    -      -       -      -
    242J  VAL      3.5     0.4    +      -       -      -
    243J  PRO*     1.3    71.7    -      -       -      +
    245J  TRP*     1.3    56.9    +      -       -      +
    247J  TYR      3.2     0.9    +      -       -      -
    248J  PHE*     2.7    69.0    +      +       +      -
    249J  ILE*     3.4    27.2    +      -       +      -
    252J  ASP*     3.4    19.3    -      -       -      -
    505J  ANJ      3.5    55.2    -      +       +      -
----------------------------------------------------------
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Residues in contact with TRP 245 (chain J). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     33J  ILE*     3.2    28.7    +      -       +      +
     34J  MET*     3.8    22.0    -      -       +      +
    243J  PRO*     3.4    21.4    -      -       -      +
    244J  PHE*     1.3    80.2    -      -       -      +
    246J  PRO*     1.3    88.9    -      -       +      +
    247J  TYR      3.4     0.9    -      -       -      -
    249J  ILE*     3.7    40.4    -      -       +      -
    250J  ILE*     5.7     2.7    -      -       +      -
----------------------------------------------------------
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Residues in contact with PRO 246 (chain J). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    243J  PRO*     4.8     0.9    -      -       +      -
    244J  PHE      3.4     1.3    -      -       -      -
    245J  TRP*     1.3   123.3    -      -       +      +
    247J  TYR*     1.3    82.6    +      -       +      +
    248J  PHE      3.4     2.2    -      -       -      -
    249J  ILE*     4.0     0.7    -      -       +      -
    250J  ILE*     3.0    32.8    +      -       +      +
    251K  LEU*     3.5    26.5    -      -       +      -
----------------------------------------------------------
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Residues in contact with TYR 247 (chain J). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    242J  VAL*     3.7    15.5    -      -       +      -
    243J  PRO*     3.2    52.5    -      -       +      +
    244J  PHE      3.2     0.8    +      -       -      -
    246J  PRO*     1.3    88.1    -      -       +      +
    248J  PHE*     1.3    62.1    +      -       -      +
    250J  ILE*     3.9     2.6    -      -       -      +
    251J  LYS      3.6     7.3    +      -       -      -
    251K  LEU*     3.4    39.7    +      -       +      +
    252K  TRP*     3.0    44.5    +      +       +      -
    254K  GLY      5.0     2.9    +      -       -      -
    255K  VAL*     3.5    32.8    -      -       +      +
----------------------------------------------------------
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Residues in contact with PHE 248 (chain J). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     37J  THR*     3.2    34.8    -      -       +      -
     38J  PRO      3.2    23.1    -      -       -      -
     39J  ARG      4.6     1.3    -      -       -      -
     41J  LEU*     3.8    24.7    -      -       +      -
    242J  VAL*     4.0    11.0    -      -       +      -
    244J  PHE*     2.7    53.2    +      +       +      -
    247J  TYR*     1.3    72.6    -      -       -      +
    249J  ILE*     1.3    66.0    +      -       -      +
    250J  ILE      2.6     6.9    +      -       -      -
    251J  LYS*     2.8    28.1    +      -       +      +
    252J  ASP*     2.8    27.3    +      -       -      +
    505J  ANJ      4.0    10.8    -      +       +      -
    252K  TRP*     3.6    25.6    -      +       -      -
----------------------------------------------------------
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Residues in contact with ILE 249 (chain J). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     33J  ILE*     3.3    30.3    -      -       +      -
    244J  PHE*     3.4    22.8    +      -       +      -
    245J  TRP*     3.7    42.2    -      -       +      -
    246J  PRO      3.7     7.2    -      -       -      +
    248J  PHE*     1.3    76.4    -      -       -      +
    250J  ILE*     1.3    60.9    +      -       +      +
    252J  ASP*     3.5     9.1    +      -       +      +
    253J  VAL*     3.0    34.7    +      -       +      +
    505J  ANJ      4.4    10.8    -      -       +      -
----------------------------------------------------------
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Residues in contact with ILE 250 (chain J). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    245J  TRP*     5.7     2.7    -      -       +      -
    246J  PRO*     3.0    24.2    +      -       +      +
    247J  TYR      3.9     2.9    -      -       -      +
    248J  PHE      2.6     4.8    +      -       -      -
    249J  ILE*     1.3    75.4    -      -       +      +
    251J  LYS*     1.3    52.9    +      -       -      +
    252J  ASP      3.0     1.1    -      -       -      -
    253J  VAL*     2.9     8.1    +      -       +      +
    254J  PHE*     2.6    33.7    +      -       +      +
    244K  LEU*     4.7    10.0    -      -       +      +
    247K  THR*     4.1    22.4    -      -       +      -
    248K  ASN*     3.2    37.5    -      -       +      +
    251K  LEU*     3.4    25.1    -      -       +      -
     16L  TYR*     6.1     4.0    -      -       +      -
----------------------------------------------------------
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Residues in contact with LYS 251 (chain J). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     41J  LEU      3.5    24.2    +      -       -      -
     42J  ASN*     4.6     3.8    +      -       -      +
     43J  TRP*     2.9    47.1    -      -       +      -
     46J  ILE*     5.4     2.2    -      -       +      -
    247J  TYR      3.6     1.8    +      -       -      +
    248J  PHE*     2.8    47.8    +      -       +      +
    250J  ILE*     1.3    75.9    -      -       -      +
    252J  ASP*     1.3    61.9    +      -       -      +
    254J  PHE*     2.7     7.1    +      -       -      +
    255J  ALA*     2.5    38.5    +      -       -      +
    505J  ANJ      4.7     7.4    +      -       -      +
    248K  ASN*     3.3    21.8    +      -       -      +
    252K  TRP*     3.9    16.5    -      -       +      +
----------------------------------------------------------
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Residues in contact with ASP 252 (chain J). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     46J  ILE*     4.5     6.3    -      -       -      +
     49J  VAL*     3.9    27.6    -      -       +      +
    244J  PHE*     3.4    20.4    -      -       -      -
    248J  PHE      2.8    17.3    +      -       -      +
    249J  ILE*     3.5     8.7    +      -       +      +
    251J  LYS*     1.3    79.0    -      -       -      +
    253J  VAL*     1.3    53.7    +      -       +      +
    255J  ALA*     3.2     5.7    +      -       -      +
    256J  LEU*     2.7    38.6    +      -       -      +
    505J  ANJ      2.9    50.7    +      -       +      +
----------------------------------------------------------
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Residues in contact with VAL 253 (chain J). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    249J  ILE*     3.0    24.4    +      -       +      +
    250J  ILE*     2.9     9.3    +      -       +      +
    252J  ASP*     1.3    80.8    -      -       +      +
    254J  PHE*     1.3    64.9    +      -       -      +
    256J  LEU*     3.3    15.6    -      -       +      +
    257J  ALA*     2.9    22.0    +      -       -      +
    244K  LEU*     3.5    28.9    -      -       +      -
----------------------------------------------------------
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Residues in contact with PHE 254 (chain J). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     43J  TRP*     3.8    36.3    -      +       -      -
    250J  ILE      2.6    17.3    +      -       -      +
    251J  LYS*     2.7    12.2    +      -       -      +
    253J  VAL*     1.3    74.2    -      -       -      +
    255J  ALA*     1.3    67.9    +      -       -      +
    257J  ALA*     3.0    14.2    +      -       -      +
    258J  VAL*     3.3    28.6    +      -       +      +
    241K  SER*     3.9    12.1    -      -       -      -
    244K  LEU*     4.1    21.3    -      -       +      +
    245K  TYR*     3.8    50.9    -      +       +      -
    248K  ASN*     4.3    14.1    -      -       +      -
----------------------------------------------------------
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Residues in contact with ALA 255 (chain J). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     43J  TRP*     5.0     8.3    -      -       +      -
     46J  ILE*     3.7    42.4    -      -       +      -
     50J  VAL*     6.0     0.4    -      -       +      -
    251J  LYS      2.5    17.5    +      -       -      +
    252J  ASP      3.6     2.9    -      -       -      +
    254J  PHE*     1.3    77.9    -      -       +      +
    256J  LEU*     1.3    65.9    +      -       -      +
    258J  VAL*     2.7    24.7    +      -       -      +
    259J  VAL*     2.9    16.3    +      -       +      +
----------------------------------------------------------
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Residues in contact with LEU 256 (chain J). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     49J  VAL*     3.3    31.2    -      -       +      -
     50J  VAL*     4.0    22.1    -      -       +      +
     53J  PHE*     4.1    35.0    -      -       +      -
    252J  ASP      2.7    20.6    +      -       -      +
    253J  VAL*     3.3    16.8    -      -       +      +
    255J  ALA*     1.3    71.8    -      -       -      +
    257J  ALA*     1.3    55.8    +      -       -      +
    259J  VAL*     3.5     6.9    -      -       +      +
    260J  LEU*     3.0    41.7    +      -       +      +
----------------------------------------------------------
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Residues in contact with ALA 257 (chain J). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    253J  VAL      2.9    11.0    +      -       -      +
    254J  PHE      3.1    11.4    -      -       -      +
    255J  ALA      2.7     4.2    +      -       -      -
    256J  LEU*     1.3    71.7    -      -       -      +
    258J  VAL*     1.3    66.8    +      -       -      +
    260J  LEU*     3.1     5.8    +      -       -      +
    261J  LEU*     2.8    22.9    +      -       -      +
    237K  LEU*     4.1    17.4    -      -       +      +
    240K  LEU*     4.8     3.8    -      -       +      -
    241K  SER*     3.9    20.0    -      -       -      +
    244K  LEU*     3.9    19.7    -      -       +      -
----------------------------------------------------------
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Residues in contact with VAL 258 (chain J). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    254J  PHE*     3.4    45.1    -      -       +      +
    255J  ALA*     2.7    14.9    +      -       -      +
    257J  ALA*     1.3    71.7    -      -       -      +
    259J  VAL*     1.3    66.2    +      -       +      +
    261J  LEU*     3.1    28.1    -      -       +      +
    262J  VAL*     3.2    14.1    +      -       +      +
    241K  SER*     4.3     9.9    -      -       -      +
----------------------------------------------------------
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Residues in contact with VAL 259 (chain J). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     46J  ILE*     4.7    10.3    -      -       +      -
     47J  TRP*     5.2     9.6    -      -       +      -
     50J  VAL*     4.0    36.6    -      -       +      -
    103J  LEU*     4.1    22.7    -      -       +      -
    255J  ALA*     2.9    20.4    +      -       -      +
    256J  LEU*     3.5    10.1    -      -       +      +
    258J  VAL*     1.3    76.3    -      -       +      +
    260J  LEU*     1.3    55.7    +      -       +      +
    262J  VAL*     2.9    11.5    +      -       -      +
    263J  PHE*     2.8    30.8    +      -       +      +
    504J  LOP      5.1     6.2    -      -       +      +
----------------------------------------------------------
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Residues in contact with LEU 260 (chain J). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     53J  PHE*     3.3    54.5    -      -       +      -
    103J  LEU*     4.9     5.4    -      -       +      -
    256J  LEU*     3.0    28.2    +      -       +      +
    257J  ALA*     3.6     5.4    -      -       -      +
    259J  VAL*     1.3    78.8    -      -       +      +
    261J  LEU*     1.3    58.2    +      -       -      +
    263J  PHE*     3.7    20.0    -      -       +      -
    264J  PHE*     2.6    54.6    +      -       +      -
    237K  LEU*     4.2    12.8    -      -       +      -
----------------------------------------------------------
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Residues in contact with LEU 261 (chain J). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    257J  ALA      2.8    12.2    +      -       -      +
    258J  VAL*     3.1    20.2    -      -       +      +
    260J  LEU*     1.3    78.5    -      -       -      +
    262J  VAL*     1.3    67.5    +      -       +      +
    264J  PHE*     3.9     1.7    -      -       -      +
    265J  ALA*     3.0    21.5    +      -       +      +
    234K  VAL*     3.6    41.6    -      -       +      +
    237K  LEU*     4.1    12.9    -      -       +      +
    238K  THR*     3.6    22.9    -      -       +      +
    241K  SER*     4.1    17.0    -      -       -      +
----------------------------------------------------------
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Residues in contact with VAL 262 (chain J). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    258J  VAL*     3.4    20.4    -      -       +      +
    259J  VAL*     2.9     7.1    +      -       -      +
    261J  LEU*     1.3    77.4    -      -       +      +
    263J  PHE*     1.3    67.4    +      -       -      +
    265J  ALA*     3.0    21.5    +      -       -      +
    266J  ILE*     3.1    15.7    +      -       +      +
    431J  BGL      3.7    25.4    -      -       +      -
    504J  LOP      3.7    33.7    -      -       +      -
----------------------------------------------------------
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Residues in contact with PHE 263 (chain J). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     53J  PHE*     5.2     0.4    -      +       -      -
     57J  LEU*     3.8    20.2    -      -       +      -
     96J  LEU*     3.4    43.7    -      -       +      -
     99J  ASN*     3.6    27.4    -      -       +      -
    100J  GLY*     4.1     3.1    -      -       -      -
    103J  LEU*     4.2    14.8    -      -       +      -
    259J  VAL      2.8    16.7    +      -       -      +
    260J  LEU*     3.4    27.6    -      -       +      +
    262J  VAL*     1.3    71.7    -      -       -      +
    264J  PHE*     1.3    73.9    +      +       -      +
    266J  ILE*     3.0    13.6    +      -       +      +
    267J  VAL*     2.9    35.8    +      -       +      +
    504J  LOP      3.8    28.6    -      -       +      +
----------------------------------------------------------
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Residues in contact with PHE 264 (chain J). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     53J  PHE*     5.6     3.1    -      +       -      -
     57J  LEU*     6.5     0.2    -      -       +      -
     92J  MET*     5.7     7.0    -      -       -      -
     96J  LEU*     4.1    32.1    -      -       +      -
    260J  LEU*     2.6    49.5    +      -       +      +
    261J  LEU      3.9     2.7    -      -       -      +
    263J  PHE*     1.3    83.9    -      +       -      +
    265J  ALA*     1.3    53.1    +      -       -      +
    267J  VAL*     3.5     7.7    -      -       +      +
    268J  GLY*     2.6    36.0    +      -       -      -
    230K  GLY*     5.4     2.1    -      -       -      -
    233K  ALA*     3.7    31.4    -      -       +      -
    234K  VAL*     5.2     2.9    -      -       +      +
    237K  LEU*     3.6    20.6    -      -       +      -
----------------------------------------------------------
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Residues in contact with ALA 265 (chain J). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    261J  LEU*     3.0    15.9    +      -       +      +
    262J  VAL*     3.0    19.0    +      -       -      +
    264J  PHE*     1.3    75.0    -      -       -      +
    266J  ILE*     1.3    50.8    +      -       -      +
    269J  PHE*     2.8    51.4    +      -       +      +
    270J  MET*     4.7     0.5    -      -       -      +
    431J  BGL      4.4    25.4    -      -       +      +
    234K  VAL*     4.6    12.7    -      -       +      +
----------------------------------------------------------
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Residues in contact with ILE 266 (chain J). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     99J  ASN*     4.1    16.6    -      -       -      +
    262J  VAL*     3.1    23.3    -      -       +      +
    263J  PHE*     3.0     7.1    +      -       +      +
    265J  ALA*     1.3    72.4    -      -       -      +
    267J  VAL*     1.3    62.5    -      -       +      +
    268J  GLY      3.0     1.6    -      -       -      -
    270J  MET*     2.6    74.6    +      -       +      +
    271J  PRO      2.9     0.3    -      -       -      -
    273J  TYR*     5.4     1.1    -      -       +      -
    274J  LEU*     5.1    13.9    -      -       +      -
    431J  BGL      4.1    20.6    -      -       +      -
    504J  LOP      4.2    21.5    -      -       +      -
----------------------------------------------------------
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Residues in contact with VAL 267 (chain J). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     92J  MET*     4.5    12.1    -      -       -      +
     95J  TYR*     3.9    26.2    -      -       +      -
     96J  LEU*     4.0    26.0    -      -       +      +
     99J  ASN*     4.3     7.9    -      -       +      +
    263J  PHE*     2.9    52.7    -      -       +      +
    264J  PHE*     3.7     9.9    -      -       +      +
    266J  ILE*     1.3    73.3    -      -       +      +
    268J  GLY*     1.3    61.7    +      -       -      +
    271J  PRO*     3.7    19.5    -      -       -      +
    226K  ARG*     4.1    10.7    -      -       -      +
----------------------------------------------------------
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Residues in contact with GLY 268 (chain J). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     92J  MET*     5.5     3.4    -      -       -      -
    264J  PHE      2.6    21.4    +      -       -      -
    265J  ALA      3.9     0.2    -      -       -      -
    267J  VAL*     1.3    74.0    -      -       -      +
    269J  PHE*     1.3    64.3    +      -       -      +
    271J  PRO*     4.6     0.2    -      -       -      -
    226K  ARG*     3.2    40.0    +      -       -      +
    227K  LYS*     4.5     2.3    -      -       -      +
    230K  GLY*     4.4    18.6    -      -       -      -
----------------------------------------------------------
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Residues in contact with PHE 269 (chain J). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    265J  ALA*     2.8    36.4    +      -       +      +
    268J  GLY*     1.3    77.5    -      -       -      +
    270J  MET*     1.3    58.8    +      -       -      +
    271J  PRO*     3.6     5.1    -      -       -      +
    431J  BGL      2.8    63.1    +      -       +      +
     16K  PRO*     3.9    37.2    -      -       +      -
    226K  ARG*     4.1     5.4    +      -       -      +
    227K  LYS*     4.1    17.5    -      -       +      -
    230K  GLY*     4.2     5.6    -      -       -      -
    231K  PHE*     3.8    40.4    -      +       -      -
    234K  VAL*     4.0    23.1    -      -       +      -
----------------------------------------------------------
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Residues in contact with MET 270 (chain J). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     99J  ASN*     4.7     0.2    -      -       -      +
    266J  ILE*     2.6    53.7    +      -       +      +
    269J  PHE*     1.3    76.9    -      -       +      +
    271J  PRO*     1.3    65.1    -      -       -      +
    272J  ASN      3.3     2.5    -      -       -      +
    273J  TYR*     3.2    48.1    +      -       +      +
    431J  BGL      3.8    41.1    -      -       +      +
    121K  LEU*     3.6    35.4    -      -       +      +
----------------------------------------------------------
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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