Contacts of the helix formed by residues 125 - 149 (chain P) 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 ARG 125 (chain P).
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    119P  GLY      5.1     0.2    -      -       -      -
    120P  SER*     3.0    30.4    -      -       -      +
    121P  TYR      3.8     6.1    -      -       -      +
    122P  LYS      3.3     4.5    +      -       -      +
    123P  ALA      3.2     4.2    +      -       -      -
    124P  PRO*     1.3    96.5    -      -       +      +
    126P  GLU*     1.3    63.6    +      -       -      +
    127P  VAL      3.5     1.3    -      -       -      -
    128P  THR*     3.5    14.9    -      -       -      +
    129P  TRP*     3.3    18.9    +      -       -      +
    219P  THR*     4.1    13.9    +      -       -      +
    220P  GLY      3.3     9.0    +      -       -      -
    221P  ASN      3.1    27.3    +      -       -      -
    222P  ASN*     3.1    27.9    +      -       -      +
    228P  GLU*     3.5    31.9    +      -       -      -
    355P  ARG*     4.1    10.5    -      -       -      +
    501P  HEM      3.0    30.4    +      -       -      +
----------------------------------------------------------
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Residues in contact with GLU 126 (chain P). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     18M  TRP*     3.9    25.0    +      -       +      -
     22M  ARG*     2.6    36.4    +      -       -      +
    121P  TYR      3.9    14.1    -      -       -      +
    123P  ALA*     3.0    38.4    +      -       -      +
    124P  PRO      3.0     2.3    +      -       -      -
    125P  ARG*     1.3    73.7    -      -       -      +
    127P  VAL*     1.3    68.7    +      -       -      +
    129P  TRP*     3.0     7.4    +      -       -      +
    130P  ILE*     3.0    25.9    +      -       +      +
    347P  PRO*     4.2    16.3    -      -       +      +
    348P  TRP*     4.4    17.8    +      -       +      -
----------------------------------------------------------
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Residues in contact with VAL 127 (chain P). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     18M  TRP*     4.5    15.3    -      -       +      -
     19M  LEU*     4.5    13.9    -      -       +      -
     22M  ARG*     3.8    34.7    -      -       +      +
     23M  LEU*     4.2    26.7    -      -       +      -
    124P  PRO      4.5     0.2    +      -       -      -
    125P  ARG      3.5     0.2    -      -       -      -
    126P  GLU*     1.3    74.0    -      -       -      +
    128P  THR*     1.3    68.9    +      -       -      +
    130P  ILE*     3.1    13.3    +      -       +      +
    131P  VAL*     2.9    35.3    +      -       +      +
    215P  ALA*     4.7     5.4    -      -       +      -
----------------------------------------------------------
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Residues in contact with THR 128 (chain P). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    125P  ARG*     3.5    20.0    +      -       -      +
    127P  VAL*     1.3    80.5    -      -       -      +
    129P  TRP*     1.3    63.7    +      -       -      +
    131P  VAL*     3.2     4.0    +      -       -      +
    132P  GLY*     2.9    19.4    +      -       -      -
    212P  HIS*     3.6    26.9    +      -       +      +
    215P  ALA*     3.8    23.8    +      -       -      +
    216P  PHE*     3.9    16.3    +      -       +      +
    219P  THR*     4.9     2.9    +      -       -      +
    501P  HEM      3.6    34.8    +      -       +      -
----------------------------------------------------------
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Residues in contact with TRP 129 (chain P). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    112P  ILE*     4.0    27.4    -      -       +      -
    115P  GLY*     4.5     6.5    -      -       -      -
    116P  LEU*     3.8    21.8    -      -       +      -
    121P  TYR*     3.4    32.5    -      +       +      -
    125P  ARG      3.3     8.8    +      -       -      +
    126P  GLU*     3.0    11.3    +      -       -      +
    128P  THR*     1.3    78.3    -      -       -      +
    130P  ILE*     1.3    66.3    +      -       +      +
    132P  GLY      3.2     1.6    +      -       -      -
    133P  MET*     3.0    31.4    +      -       +      +
    343P  MET*     3.2    37.4    +      -       +      -
    344P  ALA*     3.6    21.4    +      -       -      +
    346P  VAL*     3.4    12.5    -      -       +      +
    347P  PRO*     3.7    10.8    -      -       +      -
    501P  HEM      3.2    53.0    -      -       +      +
----------------------------------------------------------
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Residues in contact with ILE 130 (chain P). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     18M  TRP*     5.0     8.1    -      -       +      -
    126P  GLU*     3.0    22.8    +      -       +      +
    127P  VAL*     3.6    11.9    -      -       +      +
    129P  TRP*     1.3    78.8    -      -       +      +
    131P  VAL*     1.3    65.6    +      -       +      +
    133P  MET*     2.9    21.7    +      -       +      +
    134P  LEU*     3.0    25.3    +      -       +      +
    344P  ALA*     5.2     2.9    -      -       +      +
    348P  TRP*     3.8    32.5    -      -       +      -
----------------------------------------------------------
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Residues in contact with VAL 131 (chain P). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     23M  LEU*     5.7     0.4    -      -       +      -
    127P  VAL*     2.9    33.7    +      -       +      +
    128P  THR*     3.5     7.6    -      -       -      +
    130P  ILE*     1.3    72.9    -      -       +      +
    132P  GLY*     1.3    66.6    +      -       -      +
    134P  LEU*     2.8    29.5    +      -       +      +
    135P  ILE*     3.0    15.0    +      -       +      +
    208P  LEU*     3.9    32.3    -      -       +      +
    211P  ILE*     4.2    18.8    -      -       +      -
    212P  HIS*     3.9    20.6    -      -       +      +
    215P  ALA*     5.7     0.7    -      -       +      -
----------------------------------------------------------
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Residues in contact with GLY 132 (chain P). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    128P  THR      2.9    14.2    +      -       -      -
    129P  TRP      3.6     0.7    -      -       -      -
    131P  VAL*     1.3    78.3    -      -       -      +
    133P  MET*     1.3    55.8    +      -       -      +
    135P  ILE*     3.0     7.8    +      -       -      +
    136P  TYR      2.9    23.9    +      -       -      -
    212P  HIS*     3.9     6.7    +      -       -      -
    501P  HEM      3.1    43.9    -      -       -      +
----------------------------------------------------------
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Residues in contact with MET 133 (chain P). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    112P  ILE*     5.7     1.6    -      -       -      -
    129P  TRP*     3.0    43.5    +      -       +      +
    130P  ILE*     2.9    12.9    +      -       +      +
    132P  GLY*     1.3    74.4    -      -       -      +
    134P  LEU*     1.3    64.7    +      -       +      +
    136P  TYR*     3.1    15.6    +      -       +      +
    137P  LEU*     2.9    29.6    +      -       +      +
    340P  ILE*     3.8    33.2    -      -       +      +
    343P  MET*     4.0    16.8    -      -       +      -
    344P  ALA*     3.9    30.5    -      -       +      +
    501P  HEM      3.0    16.5    -      -       +      +
----------------------------------------------------------
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Residues in contact with LEU 134 (chain P). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    130P  ILE*     3.0    25.6    +      -       +      +
    131P  VAL*     2.8    27.4    +      -       +      +
    133P  MET*     1.3    71.8    -      -       +      +
    135P  ILE*     1.3    63.1    +      -       -      +
    137P  LEU*     3.1    20.4    +      -       +      +
    138P  ALA*     2.9    22.7    +      -       -      +
    208P  LEU*     3.9    25.1    -      -       +      +
----------------------------------------------------------
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Residues in contact with ILE 135 (chain P). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    131P  VAL*     3.0    12.1    +      -       +      +
    132P  GLY*     3.0    18.4    +      -       -      +
    134P  LEU*     1.3    76.5    -      -       -      +
    136P  TYR*     1.3    53.3    +      -       -      +
    138P  ALA*     3.1     7.8    +      -       -      +
    139P  MET*     2.7    53.2    +      -       +      +
    205P  ILE*     4.4     7.4    -      -       +      +
    208P  LEU*     3.8    21.1    -      -       +      -
    209P  VAL*     3.9    25.6    -      -       +      +
    212P  HIS*     4.2    17.7    -      -       +      -
    501P  HEM      3.3    45.1    -      -       +      -
----------------------------------------------------------
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Residues in contact with TYR 136 (chain P). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    105P  PHE*     4.3    16.2    -      +       -      -
    108P  VAL*     4.5     9.2    -      -       +      -
    109P  TYR*     2.7    44.2    +      +       -      -
    112P  ILE*     4.4    13.7    -      -       +      -
    132P  GLY      2.9     6.8    +      -       -      +
    133P  MET*     3.3    20.4    -      -       +      +
    135P  ILE*     1.3    75.1    -      -       -      +
    137P  LEU*     1.3    67.4    +      -       +      +
    139P  MET*     3.5     5.6    +      -       -      +
    140P  MET*     3.2    49.3    +      -       +      +
    301P  PHE*     3.0    30.4    -      +       -      -
    340P  ILE*     4.6    13.9    -      -       +      -
    343P  MET*     4.4    11.7    -      -       +      -
    501P  HEM      3.7    20.4    -      -       +      +
----------------------------------------------------------
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Residues in contact with LEU 137 (chain P). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    133P  MET*     2.9    18.1    +      -       +      +
    134P  LEU*     3.2    24.9    -      -       +      +
    136P  TYR*     1.3    80.2    -      -       +      +
    138P  ALA*     1.3    65.3    +      -       -      +
    140P  MET*     3.1    14.7    +      -       +      +
    141P  ALA*     2.9    22.4    +      -       -      +
    337P  PHE*     5.8     4.9    -      -       +      -
    340P  ILE*     5.0    16.2    -      -       +      -
    503P  SMA      4.2    22.2    -      -       -      +
----------------------------------------------------------
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Residues in contact with ALA 138 (chain P). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    134P  LEU      2.9     9.5    +      -       -      +
    135P  ILE*     3.3    10.8    -      -       -      +
    137P  LEU*     1.3    79.1    -      -       -      +
    139P  MET*     1.3    65.4    +      -       -      +
    141P  ALA*     3.2     8.4    +      -       -      +
    142P  THR*     2.8    28.6    +      -       -      -
    201P  LEU*     3.8    13.8    -      -       +      +
    204P  VAL*     5.8     2.9    -      -       +      -
    205P  ILE*     3.9    20.4    -      -       +      +
    208P  LEU*     5.2     7.0    -      -       +      -
----------------------------------------------------------
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Residues in contact with MET 139 (chain P). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    104P  PHE*     3.5    60.1    -      -       +      +
    105P  PHE*     4.0    24.7    -      -       +      -
    108P  VAL*     3.7    24.9    -      -       +      -
    135P  ILE*     2.7    42.8    +      -       +      +
    136P  TYR*     3.5    10.3    -      -       -      +
    138P  ALA*     1.3    74.7    -      -       -      +
    140P  MET*     1.3    53.4    +      -       -      +
    142P  THR*     3.0     3.0    +      -       -      -
    143P  ALA*     2.8    34.5    +      -       -      +
    205P  ILE*     3.9    19.0    -      -       +      +
    501P  HEM      4.4     1.1    -      -       -      -
    502P  HEM      5.0     4.0    -      -       +      +
----------------------------------------------------------
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Residues in contact with MET 140 (chain P). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    105P  PHE*     4.0    21.0    -      -       +      -
    109P  TYR*     5.0     0.4    -      -       -      -
    136P  TYR*     3.3    53.2    -      -       +      +
    137P  LEU*     3.1    12.0    +      -       +      +
    139P  MET*     1.3    79.2    -      -       -      +
    141P  ALA*     1.3    69.2    +      -       -      +
    143P  ALA*     3.0     2.0    +      -       -      +
    144P  PHE*     2.9    21.4    +      -       -      +
    298P  PHE*     3.7    33.6    -      -       +      -
    301P  PHE*     4.8     4.5    -      -       -      -
    340P  ILE*     4.0    20.6    -      -       +      -
    503P  SMA      4.1    32.3    -      -       -      +
----------------------------------------------------------
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Residues in contact with ALA 141 (chain P). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    137P  LEU      2.9    16.1    +      -       -      +
    138P  ALA*     3.4    10.1    -      -       -      +
    140P  MET*     1.3    73.4    -      -       -      +
    142P  THR*     1.3    68.6    +      -       -      +
    144P  PHE*     3.1    14.4    +      -       -      +
    145P  MET*     3.1    15.5    -      -       +      +
    201P  LEU*     3.7    14.6    -      -       +      -
    503P  SMA      4.0    33.9    +      -       +      +
----------------------------------------------------------
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Residues in contact with THR 142 (chain P). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    138P  ALA      2.8    21.4    +      -       -      -
    139P  MET      3.0     9.2    -      -       -      -
    141P  ALA*     1.3    71.9    -      -       -      +
    143P  ALA*     1.3    55.4    +      -       -      +
    144P  PHE      2.6    13.5    +      -       -      -
    145P  MET*     2.6    29.0    +      -       -      +
    146P  GLY      3.0     8.7    +      -       -      -
    198P  HIS*     3.4    27.8    +      -       +      +
    201P  LEU*     3.3    21.2    -      -       +      +
    202P  PRO*     4.0    10.5    -      -       +      +
    205P  ILE*     3.9     6.2    -      -       -      +
    502P  HEM      3.6    28.3    -      -       +      -
----------------------------------------------------------
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Residues in contact with ALA 143 (chain P). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    101P  ALA*     5.5     0.2    -      -       +      -
    105P  PHE*     3.7    29.4    -      -       +      -
    139P  MET      2.8    17.7    +      -       -      +
    140P  MET*     3.5     4.7    -      -       -      +
    142P  THR*     1.3    75.3    -      -       -      +
    144P  PHE*     1.3    60.7    +      -       -      +
    146P  GLY*     3.9     1.5    -      -       -      -
    147P  TYR*     3.3    21.0    +      -       -      +
    295P  GLU*     4.8     0.7    -      -       -      +
    297P  TYR*     3.8    20.3    +      -       +      +
    298P  PHE*     4.6     2.0    -      -       +      -
    502P  HEM      4.3    23.0    -      -       +      +
----------------------------------------------------------
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Residues in contact with PHE 144 (chain P). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    140P  MET      2.9     9.7    +      -       -      +
    141P  ALA      3.2    12.6    -      -       -      +
    142P  THR      2.6     5.3    +      -       -      -
    143P  ALA*     1.3    72.4    -      -       -      +
    145P  MET*     1.3    76.1    +      -       +      +
    147P  TYR*     3.1    16.4    +      -       +      +
    148P  VAL*     3.2    17.3    +      -       +      +
    158P  GLY      4.1     1.3    -      -       -      -
    159P  ALA*     3.8    23.1    -      -       -      -
    162P  ILE*     3.5    46.7    -      -       +      -
    163P  THR      5.0     0.7    -      -       -      -
    194P  PHE*     3.6    27.4    -      +       -      -
    295P  GLU*     5.2     2.7    -      -       -      -
    298P  PHE*     4.5     8.7    -      +       +      -
    503P  SMA      3.5    56.1    -      -       +      -
----------------------------------------------------------
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Residues in contact with MET 145 (chain P). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    141P  ALA*     3.1    34.3    +      -       +      +
    142P  THR*     2.6    16.0    +      -       -      +
    144P  PHE*     1.3    87.2    -      -       +      +
    146P  GLY*     1.3    63.0    +      -       -      +
    148P  VAL*     2.9    24.7    +      -       -      +
    149P  LEU*     3.3    11.1    +      -       -      +
    194P  PHE*     3.7    36.4    -      -       +      +
    197P  LEU*     3.7    29.4    -      -       +      -
    198P  HIS*     4.2     9.4    -      -       +      +
    201P  LEU*     3.7    17.5    -      -       +      -
    503P  SMA      3.8    23.3    -      -       +      -
----------------------------------------------------------
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Residues in contact with GLY 146 (chain P). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    142P  THR      3.0    10.5    +      -       -      -
    143P  ALA      4.2     0.4    -      -       -      -
    145P  MET*     1.3    76.0    -      -       -      +
    147P  TYR*     1.3    62.9    +      -       -      +
    148P  VAL      3.0     1.2    +      -       -      -
    149P  LEU*     3.1    16.2    +      -       -      +
    150P  PRO*     3.2    10.7    -      -       -      +
    198P  HIS*     3.5    30.3    +      -       -      -
    502P  HEM      3.4    22.4    -      -       -      +
----------------------------------------------------------
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Residues in contact with TYR 147 (chain P). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    143P  ALA      3.3    14.0    +      -       -      +
    144P  PHE*     3.1    10.1    +      -       +      +
    146P  GLY*     1.3    75.7    -      -       -      +
    148P  VAL*     1.3    54.2    +      -       +      +
    150P  PRO*     3.3     5.9    -      -       -      +
    154P  MET*     3.4    41.2    -      -       +      +
    155P  SER*     2.6    29.5    +      -       -      -
    158P  GLY*     6.2     0.4    -      -       -      -
    275P  GLY*     6.4     0.7    -      -       -      -
    276P  HIS*     3.6    24.2    +      -       -      +
    279P  ASN*     3.4    24.6    +      -       +      +
    293P  VAL      5.7     0.4    +      -       -      -
    295P  GLU*     3.2    45.8    -      -       +      +
    297P  TYR*     5.1     0.9    -      -       -      +
    502P  HEM      3.5    31.6    -      -       +      +
    503P  SMA      4.8     2.9    -      -       -      -
----------------------------------------------------------
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Residues in contact with VAL 148 (chain P). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    144P  PHE*     3.2    33.8    +      -       +      +
    145P  MET      2.9    10.1    +      -       -      +
    147P  TYR*     1.3    78.5    -      -       +      +
    149P  LEU*     1.3    52.6    +      -       -      +
    151P  TRP*     2.7    55.9    +      -       +      -
    155P  SER*     3.3    20.7    -      -       -      +
    159P  ALA*     4.0    11.7    -      -       +      +
    191P  LEU*     4.3     8.3    -      -       +      -
    194P  PHE*     3.7    31.0    -      -       +      -
----------------------------------------------------------
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Residues in contact with LEU 149 (chain P). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     69P  TYR*     2.7    37.4    +      -       +      +
     76P  ALA*     3.9     1.2    -      -       -      +
    145P  MET      3.5    10.8    -      -       -      +
    146P  GLY      3.1     2.8    +      -       -      +
    148P  VAL*     1.3    70.0    -      -       -      +
    150P  PRO*     1.3    60.7    -      -       +      +
    151P  TRP*     2.5    24.9    +      -       -      +
    191P  LEU*     3.7    17.4    -      -       +      +
    194P  PHE*     4.6     4.0    -      -       +      -
    195P  PHE*     4.0    30.3    -      -       +      +
    198P  HIS*     3.5    30.5    -      -       +      -
    502P  HEM      3.4    41.7    -      -       +      -
----------------------------------------------------------
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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