Contacts of the helix formed by residues 116 - 145 (chain A) in PDB entry 1VJX


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 ASN 116 (chain A).
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     57A  GLU*     3.2    33.7    +      -       -      +
     61A  GLU*     2.9     7.9    +      -       -      +
    115A  VAL*     1.3    82.5    +      -       +      +
    117A  SER*     1.3    62.1    +      -       -      +
    118A  ASP*     2.6    22.4    +      -       -      +
    119A  ALA*     3.5    12.4    +      -       +      +
    120A  GLN*     3.1    27.6    +      -       -      +
----------------------------------------------------------
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Residues in contact with SER 117 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    115A  VAL      3.4     4.6    +      -       -      -
    116A  ASN*     1.3    73.6    +      -       -      +
    118A  ASP*     1.3    63.8    +      -       -      -
    120A  GLN*     3.9    15.5    -      -       -      +
    121A  LYS*     3.1    26.9    +      -       -      +
----------------------------------------------------------
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Residues in contact with ASP 118 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    116A  ASN*     2.6    20.9    +      -       -      +
    117A  SER*     1.3    76.0    +      -       -      +
    119A  ALA*     1.3    58.9    +      -       -      +
    121A  LYS*     3.2     8.0    +      -       -      +
    122A  THR*     2.9    35.2    +      -       -      +
----------------------------------------------------------
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Residues in contact with ALA 119 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     53A  MSE      4.1    13.9    -      -       -      -
     57A  GLU*     3.5    34.3    -      -       -      +
    114A  LEU*     3.9    22.0    -      -       +      -
    116A  ASN*     3.4    13.2    +      -       +      +
    118A  ASP*     1.3    78.0    -      -       -      +
    120A  GLN*     1.3    62.8    +      -       -      +
    122A  THR*     3.1     3.4    +      -       -      -
    123A  VAL*     3.0    27.2    +      -       -      +
----------------------------------------------------------
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Residues in contact with GLN 120 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    111A  LYS*     3.1    51.8    +      -       +      +
    112A  ASP*     4.7     5.1    +      -       -      +
    114A  LEU*     3.1    24.6    +      -       +      +
    115A  VAL*     4.5     5.2    -      -       -      +
    116A  ASN      3.1    16.1    +      -       -      +
    117A  SER*     3.9    18.1    -      -       -      +
    119A  ALA*     1.3    77.1    -      -       -      +
    121A  LYS*     1.3    62.4    +      -       -      +
    123A  VAL*     3.4     0.7    +      -       -      -
    124A  LYS*     3.0    21.0    +      -       -      +
----------------------------------------------------------
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Residues in contact with LYS 121 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    117A  SER      3.1    19.2    +      -       -      +
    118A  ASP*     3.2     9.4    +      -       -      +
    120A  GLN*     1.3    75.2    -      -       -      +
    122A  THR*     1.3    64.7    +      -       -      +
    124A  LYS*     3.4     7.3    +      -       -      +
    125A  LYS*     3.1    22.7    +      -       +      +
----------------------------------------------------------
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Residues in contact with THR 122 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     49A  ILE*     3.5    26.5    -      -       +      -
     53A  MSE      3.4    23.1    -      -       +      +
    118A  ASP*     2.9    20.2    +      -       -      +
    119A  ALA*     3.1     9.3    +      -       -      -
    121A  LYS*     1.3    77.8    -      -       -      +
    123A  VAL*     1.3    60.4    +      -       -      +
    125A  LYS*     3.4    11.8    -      -       +      +
    126A  ILE*     3.4    21.0    +      -       -      +
----------------------------------------------------------
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Residues in contact with VAL 123 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     50A  PHE*     4.1    18.2    -      -       +      -
     53A  MSE      3.7    20.4    -      -       +      -
    107A  TYR*     3.8    23.8    -      -       +      +
    110A  LEU*     4.2    11.2    -      -       +      -
    111A  LYS*     4.0    12.6    -      -       +      -
    114A  LEU*     3.4    23.1    -      -       +      -
    119A  ALA      3.0    19.1    +      -       -      +
    120A  GLN      4.0     3.1    -      -       -      +
    122A  THR*     1.3    75.6    -      -       -      +
    124A  LYS*     1.3    60.0    +      -       -      +
    126A  ILE*     3.3     7.6    +      -       -      +
    127A  ILE*     3.0    30.2    +      -       +      +
----------------------------------------------------------
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Residues in contact with LYS 124 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    108A  TYR*     6.3     3.1    -      -       -      -
    111A  LYS*     3.7    27.2    -      -       +      +
    120A  GLN      3.0    16.9    +      -       -      +
    121A  LYS*     3.4     8.2    +      -       -      +
    123A  VAL*     1.3    73.4    -      -       -      +
    125A  LYS*     1.3    59.6    +      -       -      +
    127A  ILE*     3.4     8.1    +      -       +      +
    128A  ASP*     3.0    49.4    +      -       -      +
----------------------------------------------------------
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Residues in contact with LYS 125 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     49A  ILE*     6.4     2.0    -      -       -      -
    121A  LYS*     3.1    12.1    +      -       +      +
    122A  THR*     3.4    14.1    -      -       +      +
    123A  VAL      3.3     0.2    -      -       -      -
    124A  LYS*     1.3    76.5    -      -       -      +
    126A  ILE*     1.3    57.9    +      -       +      +
    128A  ASP*     3.4     9.2    +      -       -      +
    129A  GLN*     3.0    56.4    +      -       -      +
----------------------------------------------------------
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Residues in contact with ILE 126 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     14A  GLU*     3.8    22.9    -      -       -      +
     46A  HIS*     3.7    32.3    -      -       +      +
     49A  ILE*     3.7    34.1    -      -       +      -
     50A  PHE*     3.6    39.7    -      -       +      -
    107A  TYR*     4.9     4.3    -      -       +      -
    122A  THR*     3.4    13.2    +      -       +      +
    123A  VAL*     3.3    10.1    +      -       -      +
    125A  LYS*     1.3    74.5    -      -       +      +
    127A  ILE*     1.3    55.0    +      -       +      +
    129A  GLN*     3.2     4.0    +      -       -      +
    130A  GLU*     2.8    43.2    +      -       +      +
----------------------------------------------------------
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Residues in contact with ILE 127 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    104A  ILE*     5.0     4.7    -      -       +      +
    107A  TYR*     3.6    43.3    -      -       +      +
    108A  TYR*     3.5    55.0    -      -       +      +
    111A  LYS*     3.9    20.2    -      -       +      -
    123A  VAL*     3.0    21.2    +      -       +      +
    124A  LYS*     3.6     7.9    -      -       +      +
    126A  ILE*     1.3    76.2    -      -       +      +
    128A  ASP*     1.3    58.0    +      -       -      +
    130A  GLU*     3.2     8.5    +      -       -      +
    131A  LYS*     2.8    37.4    +      -       +      +
----------------------------------------------------------
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Residues in contact with ASP 128 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    124A  LYS*     3.0    48.7    +      -       -      +
    125A  LYS*     3.5     8.7    -      -       +      +
    127A  ILE*     1.3    75.7    -      -       -      +
    129A  GLN*     1.3    63.4    +      -       +      +
    131A  LYS*     3.3    28.0    +      -       -      +
    132A  GLU*     3.1    26.0    +      -       -      +
----------------------------------------------------------
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Residues in contact with GLN 129 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     42A  GLN*     5.7     2.5    -      -       +      +
     45A  ILE*     6.0     0.5    -      -       -      +
     46A  HIS*     2.9    37.2    +      -       +      +
    125A  LYS*     3.0    55.1    +      -       -      +
    126A  ILE*     3.2     7.1    +      -       -      +
    128A  ASP*     1.3    74.4    -      -       +      +
    130A  GLU*     1.3    64.8    +      -       -      +
    132A  GLU*     3.3     9.6    +      -       +      +
    133A  HIS*     3.0    34.1    +      -       -      +
----------------------------------------------------------
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Residues in contact with GLU 130 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     14A  GLU*     2.5    26.5    -      -       -      +
     43A  GLU*     2.6    26.6    -      -       -      +
     46A  HIS*     2.8    10.3    +      -       +      -
    100A  GLU*     2.5    46.9    -      -       -      +
    104A  ILE*     3.9    12.3    -      -       +      +
    107A  TYR*     3.7    24.0    -      -       +      -
    126A  ILE*     2.8    30.3    +      -       +      +
    127A  ILE*     3.5     7.0    -      -       -      +
    129A  GLN*     1.3    72.3    -      -       -      +
    131A  LYS*     1.3    57.3    +      -       -      +
    133A  HIS*     3.2     8.5    +      -       -      +
    134A  LEU*     3.1    24.1    +      -       -      +
----------------------------------------------------------
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Residues in contact with LYS 131 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    104A  ILE*     4.2    17.3    -      -       +      -
    108A  TYR*     3.5    27.5    +      -       +      +
    127A  ILE*     2.8    23.6    +      -       +      +
    128A  ASP*     3.6    29.1    +      -       -      +
    129A  GLN      3.2     0.2    -      -       -      -
    130A  GLU*     1.3    78.7    -      -       -      +
    132A  GLU*     1.3    58.0    +      -       +      +
    134A  LEU*     3.6    12.0    -      -       +      +
    135A  ARG*     3.1    24.9    +      -       -      +
----------------------------------------------------------
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Residues in contact with GLU 132 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    128A  ASP      3.1    17.1    +      -       -      +
    129A  GLN*     3.3    12.1    +      -       +      +
    131A  LYS*     1.3    75.9    -      -       -      +
    133A  HIS*     1.3    66.7    +      -       +      +
    135A  ARG*     3.0    39.9    +      -       -      +
    136A  LYS*     3.0    22.5    +      -       -      +
----------------------------------------------------------
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Residues in contact with HIS 133 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     21A  TYR*     4.7     7.7    -      -       -      +
     39A  LEU*     3.6    33.5    +      -       +      +
     42A  GLN*     2.5    46.2    +      -       +      +
     43A  GLU*     3.1    31.3    +      -       -      +
     46A  HIS*     4.3     7.1    -      +       -      -
    100A  GLU*     4.4     6.7    +      -       -      +
    129A  GLN*     3.0    32.3    +      -       +      +
    130A  GLU*     3.2    17.7    +      -       -      +
    132A  GLU*     1.3    76.6    -      -       +      +
    134A  LEU*     1.3    59.5    +      -       -      +
    136A  LYS*     3.1     6.2    +      -       -      +
    137A  LEU*     2.9    32.9    +      -       +      +
----------------------------------------------------------
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Residues in contact with LEU 134 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     97A  ILE*     4.0    35.4    -      -       +      +
    100A  GLU*     4.0    16.3    -      -       +      +
    101A  LYS*     4.0    28.5    -      -       +      -
    104A  ILE*     4.1    13.2    -      -       +      -
    130A  GLU      3.1     9.9    +      -       -      +
    131A  LYS*     3.6    13.0    -      -       +      +
    133A  HIS*     1.3    77.4    -      -       -      +
    135A  ARG*     1.3    65.7    +      -       -      +
    137A  LEU*     3.2     5.1    +      -       +      +
    138A  LEU*     2.9    40.3    +      -       +      +
----------------------------------------------------------
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Residues in contact with ARG 135 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    131A  LYS      3.1    18.4    +      -       -      +
    132A  GLU*     3.0    34.1    +      -       -      +
    133A  HIS      3.4     0.4    -      -       -      -
    134A  LEU*     1.3    75.2    -      -       -      +
    136A  LYS*     1.3    78.1    +      -       -      +
    138A  LEU*     3.3    11.3    +      -       -      +
    139A  GLU*     2.9    67.8    +      -       +      +
----------------------------------------------------------
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Residues in contact with LYS 136 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     35A  THR*     3.7    36.1    +      -       +      -
     39A  LEU*     5.1     8.5    -      -       +      -
    132A  GLU      3.0    15.1    +      -       -      +
    133A  HIS*     3.1    10.7    +      -       -      +
    135A  ARG*     1.3    87.9    -      -       -      +
    137A  LEU*     1.3    59.9    +      -       -      +
    139A  GLU*     2.9    32.2    +      -       -      +
    140A  MSE      2.9    48.8    +      -       -      +
    143A  GLU*     5.4     2.0    +      -       -      -
----------------------------------------------------------
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Residues in contact with LEU 137 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     21A  TYR*     3.6    25.1    -      -       +      +
     36A  PHE*     4.6     4.7    -      -       +      -
     39A  LEU*     4.0    22.9    -      -       +      -
     93A  LEU*     3.7    27.7    -      -       +      +
     96A  ALA*     3.7    31.2    -      -       +      +
     97A  ILE*     3.6    21.2    -      -       +      +
    100A  GLU*     4.3     9.2    -      -       +      -
    133A  HIS*     2.9    19.1    +      -       +      +
    134A  LEU*     3.5    10.8    -      -       -      +
    136A  LYS*     1.3    76.6    -      -       -      +
    138A  LEU*     1.3    57.1    +      -       -      +
    140A  MSE      3.5     5.9    +      -       -      +
    141A  LYS*     3.0    27.5    +      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 138 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     97A  ILE*     3.7    29.6    -      -       +      -
    101A  LYS*     5.7     4.5    -      -       +      +
    134A  LEU*     2.9    42.3    +      -       +      +
    135A  ARG*     3.8     8.1    -      -       -      +
    137A  LEU*     1.3    72.6    -      -       -      +
    139A  GLU*     1.3    59.5    +      -       -      +
    141A  LYS*     3.6    11.6    -      -       +      +
    142A  ARG*     2.9    32.5    +      -       -      +
----------------------------------------------------------
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Residues in contact with GLU 139 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    135A  ARG*     2.9    44.4    +      -       -      +
    136A  LYS*     2.9    37.0    +      -       -      +
    138A  LEU*     1.3    73.8    -      -       -      +
    140A  MSE      1.3    59.9    +      -       -      +
    142A  ARG*     3.4     9.2    +      -       -      +
    143A  GLU*     3.0    60.4    +      -       -      +
----------------------------------------------------------
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Residues in contact with MSE 140 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     32A  ILE*     3.6    47.1    -      -       +      -
     35A  THR*     3.5    26.9    -      -       +      -
     36A  PHE*     3.7    22.0    -      -       +      -
     89A  LEU*     3.9     8.9    -      -       +      +
     93A  LEU*     3.6    21.3    -      -       +      +
    136A  LYS*     2.9    36.7    +      -       -      +
    137A  LEU*     3.8     5.2    -      -       -      +
    139A  GLU*     1.3    71.1    -      -       +      +
    141A  LYS*     1.3    67.9    +      -       -      +
    143A  GLU*     4.7     2.5    -      -       -      +
    144A  SER*     2.9    37.0    +      -       -      +
    145A  THR*     3.8     2.3    +      -       -      -
----------------------------------------------------------
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Residues in contact with LYS 141 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     90A  LYS*     4.1    20.3    -      -       -      +
     93A  LEU*     3.4    15.8    -      -       +      +
     94A  ASP*     2.9    33.4    +      -       -      +
     97A  ILE*     4.1    16.6    -      -       +      -
    137A  LEU      3.0    17.7    +      -       -      +
    138A  LEU*     3.6    13.9    -      -       +      +
    140A  MSE      1.3    75.8    -      -       -      +
    142A  ARG*     1.3    65.1    +      -       -      +
    145A  THR*     2.9    40.9    +      -       +      +
----------------------------------------------------------
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Residues in contact with ARG 142 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    138A  LEU      2.9    19.6    +      -       -      +
    139A  GLU*     3.7     8.8    +      -       -      +
    140A  MSE      3.3     0.2    -      -       -      -
    141A  LYS*     1.3    79.8    -      -       -      +
    143A  GLU*     1.3    94.6    +      -       -      +
    145A  THR*     4.1     6.4    -      -       -      +
----------------------------------------------------------
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Residues in contact with GLU 143 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    136A  LYS*     5.4     2.1    +      -       -      -
    139A  GLU*     3.0    44.3    +      -       -      +
    140A  MSE      4.7     2.1    +      -       -      +
    142A  ARG*     1.3   107.6    +      -       -      +
    144A  SER*     1.3    66.3    +      -       -      +
    145A  THR*     3.3     6.6    +      -       -      +
----------------------------------------------------------
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Residues in contact with SER 144 (chain A). Click here for Legend to table.
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                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     32A  ILE*     4.7    13.2    -      -       -      +
     89A  LEU*     3.7    21.8    -      -       -      +
    140A  MSE      2.9    23.1    +      -       -      +
    143A  GLU*     1.3    80.3    +      -       -      +
    145A  THR*     1.3    62.6    +      -       -      +
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Residues in contact with THR 145 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     89A  LEU*     3.9    10.7    -      -       -      +
     90A  LYS*     3.4    61.5    +      -       +      +
     93A  LEU*     4.4     0.3    -      -       -      +
    141A  LYS*     2.9    42.7    +      -       +      +
    142A  ARG      4.1     7.6    -      -       -      +
    143A  GLU      3.3     3.2    +      -       -      +
    144A  SER*     1.3    82.5    +      -       -      +
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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