Contacts of the helix formed by residues 123 - 151 (chain Q) in PDB entry 6P19


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 LEU 123 (chain Q).
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     95Q  HIS*     6.0     4.7    -      -       +      +
     98Q  ALA*     4.3     9.0    -      -       +      +
     99Q  SER*     5.5    10.5    -      -       -      -
    102Q  HIS*     3.5    36.2    +      -       +      +
    122Q  SER*     1.3    84.5    +      -       -      +
    124Q  ALA*     1.3    66.6    +      -       +      +
    125Q  THR      3.4     0.4    -      -       -      -
    126Q  CYS*     3.2     2.6    +      -       -      +
    127Q  ARG*     2.9    27.2    +      -       -      +
----------------------------------------------------------
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Residues in contact with ALA 124 (chain Q). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    122Q  SER*     3.3     5.9    +      -       -      +
    123Q  LEU*     1.3    83.8    -      -       +      +
    125Q  THR*     1.3    60.7    +      -       -      +
    127Q  ARG*     3.3    10.2    +      -       -      +
    128Q  ARG*     2.9    52.3    +      -       -      +
----------------------------------------------------------
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Residues in contact with THR 125 (chain Q). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    122Q  SER*     3.4    36.7    +      -       -      +
    124Q  ALA*     1.3    77.6    -      -       -      +
    126Q  CYS*     1.3    59.7    +      -       -      +
    128Q  ARG*     3.5    15.3    -      -       -      +
    129Q  GLU*     2.9    31.3    +      -       -      +
----------------------------------------------------------
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Residues in contact with CYS 126 (chain Q). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     98Q  ALA*     3.3    28.3    -      -       -      -
    101Q  TYR*     3.7    22.0    -      -       -      -
    102Q  HIS*     3.9     7.9    -      -       +      -
    122Q  SER      3.4    14.1    -      -       -      +
    123Q  LEU*     3.2    11.2    +      -       -      +
    124Q  ALA      3.2     0.2    -      -       -      -
    125Q  THR*     1.3    80.9    -      -       -      +
    127Q  ARG*     1.3    60.7    +      -       -      +
    129Q  GLU*     3.1    26.3    -      -       -      +
    130Q  VAL*     3.0    30.6    +      -       -      +
----------------------------------------------------------
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Residues in contact with ARG 127 (chain Q). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     94Q  LYS*     4.3    14.3    -      -       +      +
     95Q  HIS*     3.3    42.9    +      -       -      +
     98Q  ALA*     3.7    22.9    -      -       +      +
    123Q  LEU      2.9    13.5    +      -       -      +
    124Q  ALA*     3.3    12.5    +      -       -      +
    126Q  CYS*     1.3    75.2    -      -       -      +
    128Q  ARG*     1.3    61.5    +      -       +      +
    130Q  VAL*     3.2     7.2    -      -       +      +
    131Q  ASP*     2.8    32.3    +      -       +      +
----------------------------------------------------------
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Residues in contact with ARG 128 (chain Q). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    124Q  ALA*     2.9    42.9    +      -       -      +
    125Q  THR*     3.5    16.8    -      -       -      +
    126Q  CYS      3.2     0.2    -      -       -      -
    127Q  ARG*     1.3    77.7    -      -       +      +
    129Q  GLU*     1.3    57.7    +      -       -      +
    131Q  ASP*     2.8    28.4    -      -       -      +
    132Q  GLU*     3.0    16.5    +      -       -      +
----------------------------------------------------------
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Residues in contact with GLU 129 (chain Q). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    101Q  TYR*     4.8     5.4    -      -       -      -
    125Q  THR*     2.9    23.3    +      -       -      +
    126Q  CYS*     3.1    28.0    -      -       -      +
    128Q  ARG*     1.3    73.5    -      -       -      +
    130Q  VAL*     1.3    84.1    +      -       -      +
    132Q  GLU*     3.3    16.3    -      -       -      +
    133Q  ILE*     3.0    44.9    +      -       +      +
----------------------------------------------------------
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Residues in contact with VAL 130 (chain Q). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     83Q  ILE*     3.7    23.3    -      -       +      +
     94Q  LYS*     4.8    15.4    +      -       +      +
     97Q  ILE*     4.6    19.1    -      -       +      +
     98Q  ALA*     4.8     2.2    -      -       +      -
    101Q  TYR*     4.4    19.5    -      -       +      -
    126Q  CYS*     3.0    15.2    +      -       -      +
    127Q  ARG*     3.2    21.8    -      -       +      +
    129Q  GLU*     1.3    99.5    -      -       -      +
    131Q  ASP*     1.3    58.0    +      -       +      +
    133Q  ILE*     3.3    11.0    -      -       +      +
    134Q  LEU*     3.0    27.9    +      -       -      +
----------------------------------------------------------
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Residues in contact with ASP 131 (chain Q). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     94Q  LYS*     5.9     8.5    -      -       +      -
    127Q  ARG*     2.8    27.7    +      -       +      +
    128Q  ARG*     2.8    29.3    -      -       -      +
    130Q  VAL*     1.3    80.4    -      -       +      +
    132Q  GLU*     1.3    67.4    +      -       -      +
    134Q  LEU*     3.3     8.3    +      -       -      +
    135Q  ASN*     2.9    26.9    +      -       -      +
----------------------------------------------------------
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Residues in contact with GLU 132 (chain Q). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    128Q  ARG      3.0    18.1    +      -       -      +
    129Q  GLU*     3.3    17.5    -      -       -      +
    131Q  ASP*     1.3    83.3    +      -       -      +
    133Q  ILE*     1.3    82.0    +      -       -      +
    135Q  ASN*     3.6     8.4    -      -       +      +
    136Q  ALA*     2.9    29.8    +      -       -      +
----------------------------------------------------------
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Residues in contact with ILE 133 (chain Q). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     77Q  ASP*     5.0     8.0    -      -       -      +
     79Q  LYS*     4.3     9.6    -      -       +      -
     80Q  ALA*     3.8    29.7    -      -       +      +
     83Q  ILE*     3.8    20.4    -      -       +      -
    101Q  TYR*     6.4     0.7    -      -       +      -
    129Q  GLU*     3.0    34.3    +      -       -      +
    130Q  VAL*     3.3    17.3    -      -       +      +
    132Q  GLU*     1.3    90.5    -      -       -      +
    134Q  LEU*     1.3    60.5    +      -       -      +
    136Q  ALA*     3.8     6.3    -      -       +      +
    137Q  SER*     2.8    30.7    +      -       -      -
----------------------------------------------------------
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Residues in contact with LEU 134 (chain Q). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     80Q  ALA*     4.8     1.8    -      -       +      +
     83Q  ILE*     4.1    17.7    -      -       +      -
     84Q  LEU*     4.2    23.8    -      -       +      -
     87Q  TYR*     4.6    11.2    -      -       +      -
     88Q  TYR*     5.6     4.0    -      -       +      +
     94Q  LYS*     3.4    33.9    -      -       -      +
    130Q  VAL      3.0    18.4    +      -       -      +
    131Q  ASP*     3.6     8.5    -      -       -      +
    133Q  ILE*     1.3    78.3    -      -       -      +
    135Q  ASN*     1.3    56.0    +      -       -      +
    137Q  SER*     2.8    22.5    +      -       -      +
    138Q  LEU*     2.9    38.3    +      -       +      +
----------------------------------------------------------
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Residues in contact with ASN 135 (chain Q). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
      7Q  ASN*     3.9    25.9    +      -       -      +
    131Q  ASP      2.9    17.0    +      -       -      +
    132Q  GLU*     3.3     9.3    +      -       +      +
    134Q  LEU*     1.3    75.0    -      -       -      +
    136Q  ALA*     1.3    58.5    +      -       -      +
    138Q  LEU*     3.4     4.8    +      -       -      +
    139Q  PHE*     2.9    55.2    +      -       -      -
----------------------------------------------------------
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Residues in contact with ALA 136 (chain Q). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    132Q  GLU*     2.9    20.8    +      -       -      +
    133Q  ILE*     3.8     7.9    -      -       -      +
    135Q  ASN*     1.3    75.2    -      -       -      +
    137Q  SER*     1.3    60.4    +      -       -      +
    139Q  PHE*     3.3     8.6    +      -       -      +
    140Q  MET*     2.9    38.6    +      -       +      +
----------------------------------------------------------
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Residues in contact with SER 137 (chain Q). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     74Q  MET*     3.8    32.4    -      -       -      +
     80Q  ALA*     4.5    12.5    -      -       -      +
     84Q  LEU*     5.0     6.4    -      -       -      +
    133Q  ILE      2.8    19.2    +      -       -      -
    134Q  LEU*     2.8    24.4    +      -       -      +
    136Q  ALA*     1.3    74.4    -      -       -      +
    138Q  LEU*     1.3    60.9    +      -       -      +
    140Q  MET*     3.4     3.9    +      -       -      +
    141Q  ILE*     2.9    30.1    +      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 138 (chain Q). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
      8Q  LEU*     6.4     0.2    -      -       +      -
     16Q  LEU*     3.7    45.7    -      -       +      +
     20Q  LEU*     3.7    24.5    -      -       +      -
     84Q  LEU*     6.2     2.5    -      -       +      -
     88Q  TYR*     5.2     4.9    -      -       +      +
    134Q  LEU*     2.9    43.1    +      -       +      +
    135Q  ASN*     3.8     6.3    -      -       -      +
    137Q  SER*     1.3    81.5    +      -       -      +
    139Q  PHE*     1.3    64.1    +      -       +      +
    141Q  ILE*     3.4    18.5    -      -       +      +
    142Q  TYR*     3.0    34.3    +      -       +      +
----------------------------------------------------------
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Residues in contact with PHE 139 (chain Q). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
      7Q  ASN*     3.2    31.2    -      -       +      -
      8Q  LEU*     3.6    46.9    -      -       +      -
    135Q  ASN*     2.9    39.6    +      -       -      +
    136Q  ALA*     3.3     8.0    +      -       -      +
    138Q  LEU*     1.3    79.5    -      -       +      +
    140Q  MET*     1.3    76.6    +      -       +      +
    142Q  TYR*     5.0     2.2    -      -       +      -
    143Q  PRO*     3.5    18.2    -      -       -      +
----------------------------------------------------------
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Residues in contact with MET 140 (chain Q). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     73Q  VAL*     4.5    21.6    -      -       +      +
     74Q  MET*     4.6     7.6    -      -       +      -
    136Q  ALA*     2.9    26.1    +      -       +      +
    137Q  SER*     3.8     6.3    -      -       -      +
    138Q  LEU      3.2     0.2    -      -       -      -
    139Q  PHE*     1.3    95.0    -      -       +      +
    141Q  ILE*     1.3    61.1    +      -       -      +
    142Q  TYR      3.6     0.2    +      -       -      -
    143Q  PRO*     3.8     6.8    -      -       -      +
    144Q  VAL*     3.6    13.5    -      -       -      +
----------------------------------------------------------
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Residues in contact with ILE 141 (chain Q). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     20Q  LEU*     5.5     7.9    -      -       +      -
     69Q  VAL*     3.8    20.9    -      -       +      +
     70Q  VAL*     3.7    28.9    -      -       +      -
     73Q  VAL*     3.7    27.1    -      -       +      -
     74Q  MET*     5.4     3.4    -      -       +      -
    137Q  SER      2.9    20.5    +      -       -      +
    138Q  LEU*     3.4    27.8    -      -       +      +
    140Q  MET*     1.3    77.4    -      -       -      +
    142Q  TYR*     1.3    68.8    +      -       +      +
    143Q  PRO      3.7     0.2    -      -       -      -
    144Q  VAL*     3.3     7.5    -      -       +      +
    145Q  LEU*     3.1    31.2    +      -       +      +
----------------------------------------------------------
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Residues in contact with TYR 142 (chain Q). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
      8Q  LEU*     4.6    13.2    -      -       +      -
     12Q  GLN*     3.3    57.8    -      -       +      +
     15Q  TRP*     3.2    38.8    -      +       -      +
     16Q  LEU*     3.6    24.7    -      -       +      -
    138Q  LEU*     3.0    17.6    +      -       +      +
    139Q  PHE*     4.7     2.9    -      -       +      +
    141Q  ILE*     1.3    78.6    -      -       +      +
    143Q  PRO*     1.4    65.9    -      -       +      +
    145Q  LEU*     3.0    11.6    +      -       +      +
    146Q  ASP*     2.8    61.6    +      -       -      +
----------------------------------------------------------
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Residues in contact with PRO 143 (chain Q). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    139Q  PHE      3.5    18.6    -      -       -      +
    140Q  MET      3.8     6.1    -      -       -      +
    142Q  TYR*     1.4    93.8    -      -       +      +
    144Q  VAL*     1.3    59.6    +      -       +      +
    146Q  ASP*     3.2    13.6    +      -       +      +
    147Q  SER*     3.0    27.6    +      -       -      -
    150Q  LYS*     5.2     0.2    +      -       -      -
----------------------------------------------------------
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Residues in contact with VAL 144 (chain Q). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     69Q  VAL*     4.8    16.6    -      -       +      -
     72Q  SER*     6.0     1.6    -      -       -      +
     73Q  VAL*     5.4     7.4    -      -       +      -
    140Q  MET      3.6    16.4    -      -       -      +
    141Q  ILE*     3.3    29.8    -      -       +      +
    143Q  PRO*     1.3    79.3    -      -       +      +
    145Q  LEU*     1.3    56.5    +      -       -      +
    147Q  SER*     2.8    20.8    +      -       -      +
    148Q  ALA*     2.9    20.6    +      -       +      +
----------------------------------------------------------
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Residues in contact with LEU 145 (chain Q). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     15Q  TRP*     4.7    23.1    -      -       +      -
     16Q  LEU*     6.1     3.8    -      -       +      -
     19Q  TRP*     5.5    11.7    -      -       +      -
     20Q  LEU*     5.3    12.3    -      -       +      -
     65Q  LEU*     4.9     7.6    -      -       +      -
     66Q  ILE*     3.7    32.8    -      -       +      -
     69Q  VAL*     4.6    12.1    -      -       +      -
    141Q  ILE*     3.1    31.4    +      -       +      +
    142Q  TYR*     3.0    13.5    +      -       +      +
    144Q  VAL*     1.3    76.3    -      -       -      +
    146Q  ASP*     1.3    59.7    +      -       -      +
    148Q  ALA*     3.7     3.1    -      -       +      -
    149Q  PHE*     2.9    35.0    +      -       +      +
----------------------------------------------------------
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Residues in contact with ASP 146 (chain Q). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     15Q  TRP*     4.0    12.7    -      -       -      -
    142Q  TYR*     2.8    54.4    +      -       -      +
    143Q  PRO*     3.2    11.8    +      -       -      +
    145Q  LEU*     1.3    77.1    -      -       -      +
    147Q  SER*     1.3    56.6    +      -       -      +
    149Q  PHE*     3.2     6.8    +      -       -      +
    150Q  LYS*     3.0    47.7    +      -       -      +
----------------------------------------------------------
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Residues in contact with SER 147 (chain Q). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    143Q  PRO      3.0    12.9    +      -       -      -
    144Q  VAL*     2.8    24.9    +      -       -      +
    146Q  ASP*     1.3    75.7    -      -       -      +
    148Q  ALA*     1.3    54.9    +      -       -      +
    150Q  LYS*     3.2    17.0    +      -       -      +
    151Q  ASN*     2.9    35.9    +      -       -      +
----------------------------------------------------------
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Residues in contact with ALA 148 (chain Q). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     65Q  LEU*     4.3    21.4    -      -       +      +
     69Q  VAL*     4.1    23.1    -      -       +      -
    144Q  VAL*     2.9    19.9    +      -       +      +
    145Q  LEU*     3.8     6.3    -      -       +      +
    146Q  ASP      3.3     0.2    -      -       -      -
    147Q  SER*     1.3    75.2    +      -       -      +
    149Q  PHE*     1.3    60.2    +      -       -      +
    151Q  ASN*     3.0    19.0    -      -       -      +
    152Q  ARG*     4.4    10.7    -      -       -      +
----------------------------------------------------------
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Residues in contact with PHE 149 (chain Q). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     15Q  TRP*     4.5    22.7    -      +       +      -
     19Q  TRP*     3.5    39.7    -      +       -      -
     62Q  ASP*     6.2     0.9    -      -       +      -
     65Q  LEU*     5.2     7.6    -      -       +      +
    145Q  LEU*     2.9    25.7    +      -       +      +
    146Q  ASP*     3.6     7.4    -      -       -      +
    147Q  SER      3.2     0.2    -      -       -      -
    148Q  ALA*     1.3    78.9    -      -       -      +
    150Q  LYS*     1.3    64.2    +      -       -      +
    151Q  ASN      3.4     0.3    +      -       -      -
    152Q  ARG*     3.8    14.4    +      -       -      +
----------------------------------------------------------
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Residues in contact with LYS 150 (chain Q). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    146Q  ASP*     3.0    49.1    +      -       -      +
    147Q  SER*     3.2    17.8    +      -       -      +
    149Q  PHE*     1.3    79.2    -      -       -      +
    151Q  ASN*     1.3    58.4    +      -       +      +
    152Q  ARG      3.2     8.4    +      -       -      +
----------------------------------------------------------
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Residues in contact with ASN 151 (chain Q). Click here for Legend to table.
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                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
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    147Q  SER*     2.9    22.6    +      -       -      +
    148Q  ALA*     3.0    21.0    -      -       -      +
    149Q  PHE      3.3     0.2    -      -       -      -
    150Q  LYS*     1.3    78.9    -      -       +      +
    152Q  ARG*     1.3    56.3    +      -       -      +
    153Q  LYS      4.3     0.9    +      -       -      -
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A short description of the analytical approach
The contact analysis used in this page is based upon the approach developed in: Sobolev V., Wade R.C., Vriend G. and Edelman M. PROTEINS (1996) 25, 120-129. Contact legitimacy depends on the hydrophobic-hydrophilic properties of the contacting atoms. In order to define it, for each inter-atomic contact, eight atom classes have been introduced:


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

Legend:
+, legitimate
-, illegitimate
------------------------------------------------------------
  Atomic class           I  II  III   IV   V   VI  VII  VIII
------------------------------------------------------------
   I  (Hydrophilic)      +   +    +    -   +   +    +    +
  II  (Acceptor)         +   -    +    -   +   +    +    -
 III  (Donor)            +   +    -    -   +   +    -    +
  IV  (Hydrophobic)      -   -    -    +   +   +    +    +
   V  (Aromatic)         +   +    +    +   +   +    +    +
  VI  (Neutral)          +   +    +    +   +   +    +    +
 VII  (Neutral-donor)    +   +    -    +   +   +    -    +
VIII  (Neutral-acceptor) +   -    +    +   +   +    +    -
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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