Contacts of the helix formed by residues 125 - 149 (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 ARG 125 (chain G).
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    119G  GLY      4.5     1.1    -      -       -      -
    120G  SER*     3.0    29.2    -      -       -      +
    121G  TYR      3.8     5.7    -      -       -      +
    122G  LYS      3.5    11.9    -      -       -      +
    123G  ALA      3.2     3.6    -      -       -      -
    124G  PRO*     1.3    85.5    -      -       +      +
    126G  GLU*     1.3    63.3    +      -       -      +
    127G  VAL      3.5     1.6    -      -       -      -
    128G  THR*     3.5    14.4    -      -       -      +
    129G  TRP*     3.3    19.1    +      -       -      +
    219G  THR*     4.5     9.6    +      -       -      +
    220G  GLY      3.1    11.8    +      -       -      -
    221G  ASN      2.7    38.2    +      -       -      -
    222G  ASN*     2.8    28.7    +      -       -      +
    228G  GLU*     3.0    34.8    +      -       -      -
    355G  ARG*     3.9    11.3    -      -       -      +
    501G  HEM      3.2    22.4    +      -       -      +
----------------------------------------------------------
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Residues in contact with GLU 126 (chain G). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    121G  TYR      3.9    13.9    -      -       -      +
    123G  ALA*     2.9    39.7    +      -       -      +
    124G  PRO      3.0     2.5    +      -       -      -
    125G  ARG*     1.3    74.3    -      -       -      +
    127G  VAL*     1.3    69.1    +      -       -      +
    129G  TRP*     3.0     7.9    +      -       -      +
    130G  ILE*     3.0    25.8    +      -       +      +
    347G  PRO*     4.1    15.9    -      -       +      -
    348G  TRP*     4.4    15.9    +      -       +      -
     18J  TRP*     3.8    26.3    +      -       +      -
     22J  ARG*     2.5    40.1    +      -       -      +
----------------------------------------------------------
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Residues in contact with VAL 127 (chain G). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    124G  PRO      4.5     0.4    +      -       -      +
    125G  ARG      3.5     0.4    -      -       -      -
    126G  GLU*     1.3    74.0    -      -       -      +
    128G  THR*     1.3    69.1    +      -       -      +
    130G  ILE*     3.1    12.6    +      -       +      +
    131G  VAL*     2.9    34.3    +      -       +      +
    215G  ALA*     4.7     5.6    -      -       +      -
     18J  TRP*     4.5    10.1    -      -       +      -
     19J  LEU*     4.4    20.4    -      -       +      -
     22J  ARG*     3.6    36.3    -      -       +      +
     23J  LEU*     4.2    26.2    -      -       +      -
----------------------------------------------------------
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Residues in contact with THR 128 (chain G). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    125G  ARG*     3.5    21.6    +      -       -      +
    127G  VAL*     1.3    80.2    -      -       -      +
    129G  TRP*     1.3    63.6    +      -       -      +
    131G  VAL*     3.1     3.9    +      -       -      +
    132G  GLY*     2.8    21.1    +      -       -      -
    212G  HIS*     3.6    30.6    +      -       +      +
    215G  ALA*     3.9    12.9    +      -       -      +
    216G  PHE*     3.9    27.1    +      -       +      +
    219G  THR*     4.8     3.3    +      -       -      +
    501G  HEM      3.8    33.6    +      -       +      -
----------------------------------------------------------
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Residues in contact with TRP 129 (chain G). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    112G  ILE*     4.2    22.0    -      -       +      -
    115G  GLY*     4.6     4.5    -      -       -      -
    116G  LEU*     3.8    26.2    -      -       +      -
    121G  TYR*     3.4    31.6    -      +       +      -
    125G  ARG      3.3     8.6    +      -       -      +
    126G  GLU*     3.0    10.7    +      -       -      +
    128G  THR*     1.3    80.8    -      -       -      +
    130G  ILE*     1.3    66.7    +      -       +      +
    132G  GLY      3.2     1.9    +      -       -      -
    133G  MET*     3.0    27.5    +      -       +      +
    343G  MET*     3.2    35.2    +      -       +      -
    344G  ALA*     3.6    20.5    +      -       -      +
    346G  VAL*     3.4    12.5    -      -       +      +
    347G  PRO*     3.7    11.9    -      -       +      -
    501G  HEM      3.2    59.3    -      -       +      +
----------------------------------------------------------
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Residues in contact with ILE 130 (chain G). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    126G  GLU*     3.0    22.1    +      -       +      +
    127G  VAL*     3.6    10.3    -      -       +      +
    129G  TRP*     1.3    80.4    -      -       +      +
    131G  VAL*     1.3    67.8    +      -       +      +
    133G  MET*     2.9    21.4    +      -       +      +
    134G  LEU*     3.0    24.4    +      -       +      +
    344G  ALA*     5.2     2.9    -      -       +      +
    348G  TRP*     3.9    32.3    -      -       +      -
     18J  TRP*     4.7     9.4    -      -       +      -
----------------------------------------------------------
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Residues in contact with VAL 131 (chain G). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    127G  VAL*     2.9    33.0    +      -       +      +
    128G  THR*     3.5     8.3    -      -       -      +
    130G  ILE*     1.3    72.1    -      -       +      +
    132G  GLY*     1.3    66.1    +      -       -      +
    134G  LEU*     2.8    29.1    +      -       +      +
    135G  ILE*     2.9    14.9    +      -       +      +
    208G  LEU*     4.0    20.4    -      -       +      +
    211G  ILE*     4.2    19.1    -      -       +      +
    212G  HIS*     3.9    34.3    -      -       +      +
    215G  ALA*     5.7     0.4    -      -       +      -
     23J  LEU*     5.5     0.4    -      -       +      -
----------------------------------------------------------
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Residues in contact with GLY 132 (chain G). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    128G  THR      2.8    13.4    +      -       -      -
    129G  TRP      3.2     0.4    +      -       -      -
    131G  VAL*     1.3    77.0    -      -       -      +
    133G  MET*     1.3    56.2    +      -       -      +
    135G  ILE*     3.0     7.8    +      -       -      +
    136G  TYR      2.9    13.9    +      -       -      -
    212G  HIS*     4.0     6.4    +      -       -      -
    501G  HEM      2.8    56.0    -      -       -      +
----------------------------------------------------------
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Residues in contact with MET 133 (chain G). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    112G  ILE*     5.6     1.3    -      -       -      -
    129G  TRP*     3.0    37.5    +      -       +      +
    130G  ILE*     2.9    13.0    +      -       +      +
    132G  GLY*     1.3    70.9    -      -       -      +
    134G  LEU*     1.3    68.2    +      -       +      +
    136G  TYR*     3.0    15.2    +      -       +      +
    137G  LEU*     2.9    26.8    +      -       +      +
    340G  ILE*     3.8    31.2    -      -       +      +
    343G  MET*     3.9    20.0    -      -       +      -
    344G  ALA*     3.9    33.9    -      -       +      +
    501G  HEM      3.2    17.2    -      -       +      +
----------------------------------------------------------
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Residues in contact with LEU 134 (chain G). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    130G  ILE*     3.0    18.7    +      -       +      +
    131G  VAL*     2.8    31.6    +      -       +      +
    133G  MET*     1.3    72.4    -      -       +      +
    135G  ILE*     1.3    64.8    +      -       -      +
    137G  LEU*     3.1    17.1    +      -       +      +
    138G  ALA*     3.0    22.7    +      -       -      +
    208G  LEU*     3.9    24.9    -      -       +      +
----------------------------------------------------------
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Residues in contact with ILE 135 (chain G). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    131G  VAL*     2.9    12.3    +      -       +      +
    132G  GLY*     3.1    13.5    -      -       -      +
    134G  LEU*     1.3    75.4    -      -       -      +
    136G  TYR*     1.3    55.2    +      -       -      +
    138G  ALA*     3.1     7.9    +      -       -      +
    139G  MET*     2.7    51.4    +      -       +      +
    205G  ILE*     4.4     6.5    -      -       +      +
    208G  LEU*     3.8    21.1    -      -       +      +
    209G  VAL*     4.0    23.8    -      -       +      +
    212G  HIS*     4.1    16.2    -      -       +      -
    501G  HEM      3.2    56.3    -      -       +      -
----------------------------------------------------------
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Residues in contact with TYR 136 (chain G). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    105G  PHE*     4.3    17.3    -      +       -      -
    108G  VAL*     4.6     9.9    -      -       +      -
    109G  TYR*     2.6    47.1    +      +       -      -
    112G  ILE*     4.3    14.4    -      -       +      -
    132G  GLY      2.9     6.8    +      -       -      +
    133G  MET*     3.2    29.2    -      -       +      +
    135G  ILE*     1.3    76.5    -      -       -      +
    137G  LEU*     1.3    66.9    +      -       +      +
    139G  MET*     3.5     6.5    -      -       -      +
    140G  MET*     3.2    47.4    +      -       +      +
    301G  PHE*     3.1    26.0    -      +       -      -
    340G  ILE*     4.5     5.8    -      -       +      -
    343G  MET*     4.4    11.9    -      -       +      -
    501G  HEM      3.6    19.3    -      -       +      -
----------------------------------------------------------
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Residues in contact with LEU 137 (chain G). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    133G  MET*     2.9    15.1    +      -       +      +
    134G  LEU*     3.3    20.6    -      -       +      +
    136G  TYR*     1.3    75.4    -      -       +      +
    138G  ALA*     1.3    65.4    +      -       -      +
    140G  MET*     3.0    25.3    +      -       +      +
    141G  ALA*     2.8    23.5    +      -       -      +
    337G  PHE*     5.8     5.2    -      -       +      -
    340G  ILE*     4.9    17.3    -      -       +      -
    503G  SMA      4.5    17.6    -      -       -      +
----------------------------------------------------------
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Residues in contact with ALA 138 (chain G). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    134G  LEU      3.0     9.2    +      -       -      +
    135G  ILE*     3.4     9.9    -      -       -      +
    137G  LEU*     1.3    77.4    -      -       -      +
    139G  MET*     1.3    66.0    +      -       -      +
    141G  ALA*     3.1     9.2    +      -       -      +
    142G  THR*     2.8    27.5    +      -       -      -
    201G  LEU*     3.9    13.5    -      -       +      +
    204G  VAL*     5.9     2.7    -      -       +      -
    205G  ILE*     3.9    22.7    -      -       +      +
    208G  LEU*     5.2     5.4    -      -       +      -
----------------------------------------------------------
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Residues in contact with MET 139 (chain G). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    104G  PHE*     3.5    52.9    -      -       +      +
    105G  PHE*     4.0    19.7    -      -       +      -
    108G  VAL*     3.8    37.9    -      -       +      -
    135G  ILE*     2.7    42.2    +      -       +      +
    136G  TYR*     3.5     9.4    -      -       -      +
    138G  ALA*     1.3    74.2    -      -       -      +
    140G  MET*     1.3    66.0    +      -       -      +
    142G  THR*     3.0     3.5    +      -       -      -
    143G  ALA*     2.8    23.4    +      -       -      +
    205G  ILE*     3.9    18.8    -      -       +      +
    501G  HEM      4.5     0.7    -      -       -      -
    502G  HEM      5.4     3.6    -      -       +      +
----------------------------------------------------------
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Residues in contact with MET 140 (chain G). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    105G  PHE*     3.9    21.1    -      -       +      -
    109G  TYR*     5.0     0.4    -      -       -      -
    136G  TYR*     3.3    53.8    -      -       +      +
    137G  LEU*     3.0    19.1    +      -       +      +
    139G  MET*     1.3    77.5    -      -       -      +
    141G  ALA*     1.3    67.1    +      -       -      +
    142G  THR      3.0     0.3    +      -       -      -
    143G  ALA*     3.1     2.3    +      -       -      +
    144G  PHE*     2.9    24.3    +      -       -      +
    298G  PHE*     3.7    26.2    -      -       +      -
    301G  PHE*     4.8     4.3    -      -       -      -
    340G  ILE*     3.9    20.6    -      -       +      -
    503G  SMA      3.9    33.1    -      -       +      +
----------------------------------------------------------
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Residues in contact with ALA 141 (chain G). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    137G  LEU      2.8    14.8    +      -       -      +
    138G  ALA*     3.3    11.9    -      -       -      +
    140G  MET*     1.3    73.1    -      -       -      +
    142G  THR*     1.3    62.8    +      -       -      +
    144G  PHE*     3.4    14.6    -      -       -      +
    145G  MET*     2.9    18.6    -      -       +      +
    201G  LEU*     3.8    13.2    -      -       +      -
    503G  SMA      4.1    33.6    +      -       +      +
----------------------------------------------------------
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Residues in contact with THR 142 (chain G). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    138G  ALA      2.8    20.1    +      -       -      -
    139G  MET*     3.0    10.3    -      -       -      -
    141G  ALA*     1.3    67.5    -      -       -      +
    143G  ALA*     1.3    54.7    +      -       -      +
    144G  PHE      2.7    16.6    +      -       -      -
    145G  MET*     2.7    26.7    +      -       -      +
    146G  GLY      3.0     9.5    +      -       -      -
    198G  HIS*     3.4    30.2    +      -       +      +
    201G  LEU*     3.3    20.7    -      -       +      +
    202G  PRO*     4.0    10.0    -      -       +      +
    205G  ILE*     3.9     6.8    -      -       -      +
    502G  HEM      3.8    24.9    -      -       +      -
----------------------------------------------------------
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Residues in contact with ALA 143 (chain G). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    101G  ALA*     5.5     0.7    -      -       +      -
    105G  PHE*     3.7    28.9    -      -       +      -
    139G  MET      2.8    13.9    +      -       -      +
    140G  MET*     3.5     4.9    -      -       -      +
    142G  THR*     1.3    79.6    -      -       -      +
    144G  PHE*     1.3    60.2    +      -       -      +
    146G  GLY      3.9     0.9    -      -       -      -
    147G  TYR*     3.2    22.3    +      -       -      +
    295G  GLU*     4.6     0.6    -      -       -      +
    297G  TYR*     4.0    16.9    +      -       +      +
    298G  PHE*     4.6     1.3    -      -       +      -
    502G  HEM      3.9    27.9    -      -       +      +
----------------------------------------------------------
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Residues in contact with PHE 144 (chain G). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    140G  MET      2.9     9.9    +      -       -      +
    141G  ALA      3.4     7.0    -      -       -      +
    142G  THR      2.7     5.1    +      -       -      -
    143G  ALA*     1.3    72.8    -      -       -      +
    145G  MET*     1.3    70.3    +      -       -      +
    147G  TYR*     3.1    17.3    +      -       +      +
    148G  VAL*     3.2    22.6    +      -       +      +
    158G  GLY      4.1     0.4    -      -       -      -
    159G  ALA*     3.8    21.8    -      -       -      -
    162G  ILE*     3.3    47.6    -      -       +      -
    163G  THR*     5.0     2.5    -      -       +      -
    194G  PHE*     3.6    27.1    -      +       -      -
    295G  GLU*     4.9     1.3    -      -       -      -
    298G  PHE*     4.5     8.5    -      +       +      -
    503G  SMA      3.3    66.2    -      -       +      -
----------------------------------------------------------
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Residues in contact with MET 145 (chain G). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    141G  ALA*     2.9    32.3    +      -       +      +
    142G  THR*     2.7    17.5    +      -       -      +
    144G  PHE*     1.3    76.6    -      -       +      +
    146G  GLY*     1.3    63.0    +      -       -      +
    148G  VAL*     2.9    25.4    +      -       -      +
    149G  LEU*     3.2    11.3    +      -       -      +
    194G  PHE*     3.7    34.4    -      -       +      +
    197G  LEU*     3.6    34.3    -      -       +      -
    198G  HIS*     4.2     9.4    -      -       +      +
    201G  LEU*     3.7    17.5    -      -       +      -
    503G  SMA      3.4    30.5    -      -       +      -
----------------------------------------------------------
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Residues in contact with GLY 146 (chain G). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    142G  THR      3.0    10.5    +      -       -      -
    143G  ALA      3.7     0.9    +      -       -      -
    145G  MET*     1.3    74.3    -      -       -      +
    147G  TYR*     1.3    61.8    +      -       -      +
    148G  VAL      2.9     1.4    +      -       -      -
    149G  LEU*     3.0    16.8    +      -       -      +
    150G  PRO*     3.2    10.4    -      -       -      +
    198G  HIS*     3.5    30.3    +      -       -      -
    502G  HEM      3.5    22.0    -      -       -      +
----------------------------------------------------------
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Residues in contact with TYR 147 (chain G). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    143G  ALA      3.2    13.7    +      -       -      +
    144G  PHE*     3.1    10.6    +      -       +      +
    146G  GLY*     1.3    74.9    -      -       -      +
    148G  VAL*     1.3    53.2    +      -       +      +
    150G  PRO*     3.3     6.2    -      -       -      +
    154G  MET*     3.5    41.0    -      -       +      +
    155G  SER*     2.7    29.7    +      -       -      -
    158G  GLY*     6.2     0.2    -      -       -      -
    275G  GLY*     6.4     0.9    -      -       -      -
    276G  HIS*     3.6    24.4    +      -       -      +
    279G  ASN*     3.5    24.1    +      -       +      +
    293G  VAL      5.6     0.6    +      -       -      -
    295G  GLU*     3.6    45.4    -      -       +      +
    297G  TYR*     5.4     0.4    -      -       -      -
    502G  HEM      3.8    35.2    -      -       +      -
    503G  SMA      4.6     5.4    -      -       -      -
----------------------------------------------------------
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Residues in contact with VAL 148 (chain G). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    144G  PHE*     3.2    34.1    +      -       +      +
    145G  MET*     2.9     9.3    +      -       -      +
    147G  TYR*     1.3    79.5    -      -       -      +
    149G  LEU*     1.3    52.7    +      -       -      +
    151G  TRP*     2.8    55.9    +      -       +      -
    155G  SER*     3.3    20.6    -      -       -      +
    159G  ALA*     4.1    11.7    -      -       +      -
    190G  THR*     6.6     0.2    -      -       -      -
    191G  LEU*     4.3     8.1    -      -       +      -
    194G  PHE*     3.7    32.3    -      -       +      -
----------------------------------------------------------
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Residues in contact with LEU 149 (chain G). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     69G  TYR*     2.6    41.7    +      -       +      +
     76G  ALA*     3.9     2.4    -      -       -      +
    145G  MET      3.5     8.5    -      -       -      +
    146G  GLY      3.0     7.2    +      -       -      +
    148G  VAL*     1.3    75.6    -      -       -      +
    150G  PRO*     1.3    59.7    -      -       +      +
    151G  TRP*     2.6    18.4    +      -       -      +
    191G  LEU*     3.8    17.1    -      -       +      +
    194G  PHE*     4.6     3.6    -      -       +      -
    195G  PHE*     4.0    33.9    -      -       +      +
    198G  HIS*     3.6    35.4    -      -       +      -
    502G  HEM      3.6    28.3    -      -       +      -
----------------------------------------------------------
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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