Contacts of the helix formed by residues 132 - 155 (chain L) in PDB entry 1VEQ


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 132 (chain L).
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    121K  ARG*     4.8     2.5    -      -       -      +
    124K  ILE*     4.5    20.6    -      -       +      -
    125K  GLU*     4.6    22.4    -      -       -      +
    128K  GLU*     4.7    17.0    -      -       -      +
    135K  GLN*     4.8     7.9    -      -       -      +
    139K  ILE*     4.3    20.9    -      -       +      +
    127L  LEU      5.0     0.4    -      -       -      -
    128L  GLU*     4.5    29.6    +      -       +      +
    130L  LEU      4.2     0.4    -      -       -      -
    131L  ASP*     1.3    72.0    +      -       -      +
    133L  VAL*     1.3    63.2    +      -       +      +
    135L  GLN*     3.0    42.5    +      -       -      +
    136L  ASP*     3.1    10.0    +      -       -      +
----------------------------------------------------------
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Residues in contact with VAL 133 (chain L). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    121K  ARG*     4.0     7.2    -      -       -      +
    124K  ILE*     4.9     7.4    -      -       +      -
    139K  ILE*     4.0    18.1    -      -       +      +
    142K  ALA*     3.8    23.8    -      -       +      -
    143K  GLY*     3.9    21.5    -      -       -      +
    146K  GLU*     3.9    10.3    -      -       -      +
     71L  ARG*     3.5    31.0    -      -       -      +
    131L  ASP*     3.2     9.1    +      -       -      +
    132L  LEU*     1.3    73.3    -      -       +      +
    134L  SER*     1.3    55.9    +      -       -      +
    135L  GLN      2.6    14.8    +      -       -      -
    136L  ASP*     3.2     4.3    +      -       -      +
    137L  LEU*     3.2    22.9    +      -       +      +
----------------------------------------------------------
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Residues in contact with SER 134 (chain L). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     17L  VAL*     4.0    25.8    -      -       -      +
     21L  LEU*     4.8     7.5    -      -       -      +
     71L  ARG*     3.0    25.9    +      -       -      +
     75L  LEU*     4.9     1.7    -      -       -      +
    127L  LEU*     3.2    19.3    -      -       -      +
    131L  ASP*     2.5    34.7    +      -       -      -
    132L  LEU      3.5     0.4    -      -       -      -
    133L  VAL*     1.3    70.5    -      -       -      +
    135L  GLN*     1.3    57.4    +      -       -      +
    137L  LEU*     4.1    10.9    -      -       -      +
    138L  LEU*     3.7    15.8    +      -       -      +
----------------------------------------------------------
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Residues in contact with GLN 135 (chain L). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    132J  LEU*     5.0     9.2    -      -       -      +
    124L  ILE*     3.5    34.7    +      -       +      +
    125L  GLU*     5.1     0.2    -      -       -      +
    127L  LEU*     4.2     8.7    -      -       +      -
    128L  GLU*     3.3    46.0    -      -       -      +
    131L  ASP      3.4    10.0    +      -       -      +
    132L  LEU*     3.0    31.3    +      -       -      +
    133L  VAL      2.6     2.8    +      -       -      -
    134L  SER*     1.3    78.7    -      -       -      +
    136L  ASP*     1.3    63.2    +      -       -      +
    137L  LEU      2.6     5.7    +      -       -      -
    138L  LEU*     2.7    13.4    +      -       -      +
    139L  ILE*     2.8    24.1    +      -       +      +
----------------------------------------------------------
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Residues in contact with ASP 136 (chain L). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    136J  ASP*     2.4    37.9    -      -       -      +
    136K  ASP*     2.4    19.3    -      -       -      +
    139K  ILE*     4.0    28.4    -      -       +      +
    140K  ALA*     5.3     6.4    -      -       -      +
    132L  LEU      3.1     5.3    +      -       -      +
    133L  VAL      4.1     1.6    -      -       -      +
    135L  GLN*     1.3    78.8    +      -       -      +
    137L  LEU*     1.3    63.5    -      -       -      +
    139L  ILE*     3.7    11.7    -      -       -      +
    140L  ALA*     3.1    23.2    +      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 137 (chain L). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     21L  LEU*     6.1     0.9    -      -       +      -
     67L  GLU*     4.7    27.6    -      -       +      +
     68L  VAL*     4.5     8.7    -      -       +      -
     71L  ARG*     4.7    22.2    -      -       +      -
    133L  VAL*     3.2    19.6    +      -       +      +
    134L  SER*     4.1     7.9    -      -       -      -
    135L  GLN      2.6     0.8    +      -       -      -
    136L  ASP*     1.3    81.3    -      -       -      +
    138L  LEU*     1.3    78.0    +      -       +      +
    139L  ILE      3.2     0.2    +      -       -      -
    140L  ALA*     3.3     6.7    +      -       -      +
    141L  HIS*     3.1    50.9    -      -       +      +
----------------------------------------------------------
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Residues in contact with LEU 138 (chain L). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     21L  LEU*     4.0    24.7    -      -       +      -
     24L  GLN*     3.2    41.5    -      -       +      +
     28L  TYR*     4.0     5.2    -      -       -      +
     68L  VAL*     4.9     2.5    -      -       +      -
    120L  THR*     3.6    22.2    -      -       +      +
    123L  SER*     5.0     6.3    -      -       -      -
    124L  ILE*     4.0    15.3    -      -       +      -
    127L  LEU*     4.5    10.8    -      -       +      -
    134L  SER      3.9    10.5    -      -       -      +
    135L  GLN      2.7    11.2    +      -       -      +
    137L  LEU*     1.3    93.5    -      -       +      +
    139L  ILE*     1.3    63.4    +      -       -      +
    141L  HIS*     3.3    12.0    +      -       +      +
    142L  ALA*     3.2    15.1    +      -       -      +
----------------------------------------------------------
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Residues in contact with ILE 139 (chain L). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    132J  LEU*     4.4    25.1    -      -       +      +
    133J  VAL*     4.1    21.8    -      -       +      -
    136J  ASP*     3.9    29.8    -      -       +      +
    124L  ILE*     3.8    31.2    -      -       +      +
    135L  GLN*     2.8    36.0    +      -       +      +
    136L  ASP*     3.7    14.6    -      -       -      +
    138L  LEU*     1.3    69.0    -      -       -      +
    140L  ALA*     1.3    73.2    +      -       -      +
    142L  ALA*     2.6    22.9    +      -       -      +
    143L  GLY      3.2     3.1    +      -       -      -
----------------------------------------------------------
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Residues in contact with ALA 140 (chain L). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    136J  ASP*     5.2     7.4    +      -       -      +
     64L  TYR*     4.5     5.0    +      -       +      -
    136L  ASP*     3.1    13.3    +      -       -      +
    137L  LEU*     3.5    11.0    -      -       -      +
    139L  ILE*     1.3    81.8    -      -       -      +
    141L  HIS*     1.3    68.0    +      -       +      +
    143L  GLY*     3.1    15.1    +      -       -      +
    144L  GLU*     3.6     5.7    +      -       -      +
----------------------------------------------------------
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Residues in contact with HIS 141 (chain L). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     28L  TYR*     2.7    32.7    +      +       -      +
     64L  TYR*     3.3    47.3    -      +       +      -
     67L  GLU*     3.0    20.5    +      -       -      -
     68L  VAL*     3.9     7.2    -      -       +      -
    120L  THR*     5.7     0.9    -      -       +      -
    137L  LEU*     3.1    39.1    -      -       +      +
    138L  LEU*     3.4     9.7    -      -       +      +
    139L  ILE      2.9     3.6    +      -       -      -
    140L  ALA*     1.3    72.6    -      -       +      +
    142L  ALA*     1.3    67.6    +      -       -      +
    144L  GLU*     2.9     5.2    +      -       -      +
    145L  LEU*     2.7    41.3    +      -       +      +
----------------------------------------------------------
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Residues in contact with ALA 142 (chain L). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    133J  VAL*     3.8    13.9    -      -       +      -
    117L  ILE*     5.6     3.1    -      -       +      -
    120L  THR*     4.4    15.7    -      -       +      +
    121L  ARG*     5.4     1.3    -      -       -      +
    124L  ILE*     4.5     3.8    -      -       +      -
    138L  LEU      3.2     7.6    +      -       -      +
    139L  ILE*     2.6    16.8    +      -       -      +
    141L  HIS*     1.3    73.8    -      -       -      +
    143L  GLY*     1.3    57.4    +      -       -      +
    145L  LEU*     4.1     8.1    -      -       -      -
    146L  GLU*     2.7    56.7    +      -       -      +
----------------------------------------------------------
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Residues in contact with GLY 143 (chain L). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     71J  ARG*     4.3     7.3    +      -       -      -
    133J  VAL*     3.9    20.0    -      -       -      +
    139L  ILE      3.2     3.4    +      -       -      -
    140L  ALA*     3.1    10.8    +      -       -      -
    142L  ALA*     1.3    79.6    -      -       -      +
    144L  GLU*     1.3    58.5    +      -       -      +
    146L  GLU*     4.1     1.7    -      -       -      +
    147L  LYS*     3.2    26.3    +      -       -      +
----------------------------------------------------------
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Residues in contact with GLU 144 (chain L). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     57L  GLN*     4.2     5.1    -      -       -      +
     60L  LEU*     3.5    28.2    -      -       +      +
     64L  TYR*     3.4    24.2    +      -       +      +
    140L  ALA      3.6     5.4    +      -       -      +
    141L  HIS      2.9     2.8    +      -       -      +
    143L  GLY*     1.3    75.5    -      -       -      +
    145L  LEU*     1.3    60.7    +      -       -      +
    147L  LYS*     3.6    21.6    +      -       +      +
    148L  PHE*     2.8    32.7    +      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 145 (chain L). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     28L  TYR*     4.6     9.2    -      -       +      +
     31L  LEU*     4.0    18.8    -      -       +      -
     57L  GLN*     3.6    13.7    -      -       -      +
     61L  VAL*     4.6     3.4    -      -       +      -
     64L  TYR*     4.1    15.3    -      -       +      -
    113L  TYR*     3.6    33.5    -      -       +      -
    116L  VAL*     4.7    14.8    -      -       +      -
    117L  ILE*     4.5    12.1    -      -       +      -
    120L  THR*     5.7     4.3    -      -       +      +
    141L  HIS*     2.7    52.7    +      -       +      +
    142L  ALA*     3.6     7.4    -      -       -      +
    144L  GLU*     1.3    74.4    -      -       -      +
    146L  GLU*     1.3    63.7    +      -       -      +
    148L  PHE*     3.2     2.6    +      -       -      +
    149L  GLN      3.0    18.5    +      -       -      -
----------------------------------------------------------
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Residues in contact with GLU 146 (chain L). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
      6J  ILE*     3.5    16.9    -      -       +      +
     71J  ARG*     2.9    39.3    +      -       -      +
     74J  THR*     3.4    15.0    -      -       +      +
    133J  VAL*     3.8     1.5    -      -       -      +
    117L  ILE*     3.5    34.0    -      -       +      +
    121L  ARG*     2.9    35.1    +      -       -      -
    142L  ALA*     2.7    36.2    +      -       -      +
    143L  GLY      4.1     0.2    -      -       -      +
    145L  LEU*     1.3    72.9    -      -       -      +
    147L  LYS*     1.3    62.6    +      -       -      +
    149L  GLN*     3.3     7.4    -      -       -      +
    150L  TRP      3.2    15.8    +      -       -      -
----------------------------------------------------------
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Residues in contact with LYS 147 (chain L). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     66J  ASP      5.0     0.2    +      -       -      -
     67J  GLU*     5.0    10.9    +      -       -      +
     70J  GLU*     2.7    46.3    +      -       -      +
     71J  ARG*     5.2     1.3    -      -       -      +
     74J  THR*     4.2    18.8    -      -       -      +
    143L  GLY      3.2    18.2    +      -       -      +
    144L  GLU*     3.6    23.9    +      -       +      +
    145L  LEU      3.2     0.2    -      -       -      -
    146L  GLU*     1.3    77.9    -      -       -      +
    148L  PHE*     1.3    59.7    +      -       -      +
    150L  TRP*     2.8    36.0    +      -       +      +
    151L  PHE*     3.2    27.3    +      -       +      -
----------------------------------------------------------
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Residues in contact with PHE 148 (chain L). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     35L  LEU*     4.2    11.7    -      -       +      -
     53L  MET*     4.1    33.0    -      -       +      -
     54L  ILE*     4.7     5.4    -      -       +      -
     57L  GLN*     3.1    50.5    -      -       +      +
    109L  LEU*     4.2     7.4    -      -       +      -
    113L  TYR*     3.4    38.4    -      +       -      -
    144L  GLU*     2.8    16.0    +      -       +      +
    145L  LEU      3.6     2.7    -      -       -      +
    147L  LYS*     1.3    72.5    -      -       -      +
    149L  GLN*     1.3    66.6    +      -       -      +
    151L  PHE*     2.8    40.5    +      +       +      +
    152L  VAL*     3.1    28.4    +      -       +      -
----------------------------------------------------------
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Residues in contact with GLN 149 (chain L). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
      6J  ILE*     5.0     3.8    -      -       -      +
      7J  PRO*     4.0     5.5    -      -       -      +
     74J  THR*     5.7     1.7    -      -       -      +
    110L  ASP*     3.4    16.3    +      -       -      +
    113L  TYR*     3.4    23.0    -      -       +      +
    114L  ASN*     3.0    32.9    +      -       -      +
    117L  ILE*     3.5    19.3    -      -       +      +
    145L  LEU      3.0    13.0    +      -       -      +
    146L  GLU*     3.3    11.2    -      -       -      +
    148L  PHE*     1.3    77.2    -      -       -      +
    150L  TRP*     1.3    65.2    +      -       -      +
    152L  VAL*     2.8    15.3    +      -       +      +
    153L  ARG*     2.8    55.6    +      -       +      +
----------------------------------------------------------
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Residues in contact with TRP 150 (chain L). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     39A  HIS      5.0     0.2    -      -       -      -
     40A  TRP*     3.7    19.7    -      -       -      -
     42A  VAL      5.2     1.8    -      -       -      -
     43A  VAL*     6.1     1.1    -      -       +      -
     47A  PHE*     4.2    17.3    -      +       -      -
     51A  HIS*     4.5     9.2    -      +       -      -
     99A  ARG*     4.8     5.3    -      -       -      +
      4J  PHE*     4.4    13.4    -      +       -      -
     70J  GLU*     4.3    33.0    -      -       +      -
     73J  ALA*     3.5    47.4    +      -       +      +
     74J  THR*     3.7    26.2    -      -       +      -
    146L  GLU      3.2     3.0    +      -       -      -
    147L  LYS*     2.8    23.2    +      -       +      +
    149L  GLN*     1.3    78.5    +      -       -      +
    151L  PHE*     1.3    83.9    +      +       -      -
    153L  ARG*     3.0     9.7    +      -       -      +
    154L  ALA*     2.7    47.2    +      -       +      +
    157L  GLU*     5.4     1.4    +      -       -      -
----------------------------------------------------------
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Residues in contact with PHE 151 (chain L). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     47A  PHE*     3.3    24.5    -      +       -      -
     48A  ILE*     4.2    11.2    -      -       +      -
     51A  HIS*     3.8    30.3    -      +       -      -
     70J  GLU*     5.0     1.3    -      -       -      -
     53L  MET*     4.0    22.2    -      -       +      -
    147L  LYS*     3.2    30.7    +      -       +      -
    148L  PHE*     2.8    41.5    +      +       +      +
    150L  TRP*     1.3    89.7    -      +       -      +
    152L  VAL*     1.3    64.3    +      -       -      +
    154L  ALA*     3.3     5.4    +      -       -      +
    155L  HIS*     2.9    23.7    +      -       -      -
----------------------------------------------------------
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Residues in contact with VAL 152 (chain L). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     53L  MET*     4.7     2.0    -      -       +      +
    106L  LEU*     3.1    57.1    -      -       +      +
    109L  LEU*     4.3     7.6    -      -       +      -
    110L  ASP*     4.2    14.1    -      -       +      +
    113L  TYR*     5.5     2.0    -      -       +      -
    148L  PHE*     3.3    44.4    -      -       +      +
    149L  GLN*     2.8    15.8    +      -       +      +
    151L  PHE*     1.3    76.4    -      -       -      +
    153L  ARG*     1.3    63.2    +      -       +      +
    155L  HIS*     3.0    19.3    +      -       -      +
    156L  LEU*     3.9     5.7    -      -       +      +
----------------------------------------------------------
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Residues in contact with ARG 153 (chain L). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
      4J  PHE*     3.5    54.1    -      -       +      +
      5J  THR      3.6    22.8    +      -       -      +
      6J  ILE*     4.4     1.4    -      -       -      +
      7J  PRO*     4.1     3.2    -      -       -      +
     74J  THR*     5.0     2.6    +      -       -      +
    110L  ASP*     2.7    33.2    +      -       +      +
    114L  ASN*     3.1    31.7    +      -       -      +
    149L  GLN*     2.8    42.9    +      -       +      +
    150L  TRP*     3.4    10.8    -      -       -      +
    152L  VAL*     1.3    69.0    -      -       -      +
    154L  ALA*     1.3    53.1    +      -       -      +
    155L  HIS      2.7     5.7    +      -       -      -
    156L  LEU*     2.6    40.4    +      -       +      +
    157L  GLU*     3.5     9.5    +      -       +      +
----------------------------------------------------------
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Residues in contact with ALA 154 (chain L). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     42A  VAL      4.6     0.2    -      -       -      +
     43A  VAL*     3.7    24.6    -      -       +      +
     44A  GLY      3.1    25.3    +      -       -      -
     47A  PHE*     3.8    33.8    -      -       +      +
    150L  TRP*     2.7    32.5    +      -       +      +
    151L  PHE      3.3     0.4    +      -       -      +
    153L  ARG*     1.3    70.9    -      -       -      +
    155L  HIS*     1.3    59.5    +      -       -      +
    156L  LEU      3.2     0.6    +      -       -      -
    157L  GLU*     4.0    10.9    +      -       -      -
----------------------------------------------------------
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Residues in contact with HIS 155 (chain L). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     44A  GLY      3.0    15.3    -      -       -      +
     45A  PRO*     3.1    36.3    +      -       -      +
     46A  ASN*     4.8     0.6    -      -       -      -
     47A  PHE*     3.2    26.9    +      +       +      -
     48A  ILE*     3.6    29.8    +      -       +      +
     46L  ASN*     4.4     1.3    +      -       -      -
     49L  GLY*     5.5     0.4    -      -       -      -
     50L  VAL*     4.0    17.5    +      -       +      +
     53L  MET*     3.8     9.6    -      -       -      -
    103L  GLN*     4.0    10.5    +      -       -      +
    106L  LEU*     3.4    28.7    -      -       +      +
    151L  PHE      2.9    20.7    +      -       -      -
    152L  VAL*     3.0    12.0    +      -       -      +
    153L  ARG      2.7     0.8    +      -       -      -
    154L  ALA*     1.3    78.0    -      -       -      +
    156L  LEU*     1.3    61.7    +      -       -      +
    157L  GLU      3.8     0.6    -      -       -      +
----------------------------------------------------------
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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