Contacts of the helix formed by residues 113 - 139 (chain A) in PDB entry 1F33


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 113 (chain A).
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     55A  ARG*     3.4     9.2    -      -       -      +
     56A  GLY*     5.0     5.4    -      -       -      -
     57A  ALA      5.5     1.0    +      -       -      -
    112A  HIS*     1.3    81.9    -      -       -      +
    114A  VAL*     1.3    65.7    +      -       -      +
    115A  GLN*     2.8    46.9    -      -       -      +
    116A  ASP*     3.2    26.5    +      -       -      +
    117A  HIS*     3.2    19.6    +      -       -      -
----------------------------------------------------------
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Residues in contact with VAL 114 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     54A  MET*     4.3    12.8    -      -       +      -
     55A  ARG      2.9    37.8    +      -       -      +
     56A  GLY      3.8     4.7    -      -       -      +
     57A  ALA      3.4    27.6    -      -       -      +
     58A  ASN*     4.5     1.3    -      -       +      +
     59A  PHE*     4.1    11.2    -      -       -      -
     62A  VAL*     4.2    23.6    -      -       +      -
    112A  HIS      4.1     1.3    -      -       -      -
    113A  ASN*     1.3    74.8    -      -       -      +
    115A  GLN*     1.3    63.6    +      -       +      +
    117A  HIS*     3.2     4.2    +      -       -      +
    118A  LEU*     2.8    46.9    +      -       +      +
----------------------------------------------------------
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Residues in contact with GLN 115 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     57A  ALA*     5.3     3.6    +      -       +      +
     58A  ASN*     5.9     3.0    -      -       -      +
    113A  ASN*     2.8    24.1    -      -       -      +
    114A  VAL*     1.3    78.1    -      -       +      +
    116A  ASP*     1.3    61.2    +      -       -      +
    118A  LEU*     3.3    12.4    +      -       -      +
    119A  LYS*     2.9    41.6    +      -       -      +
    165A  ASN      3.2    21.7    +      -       -      -
    166A  ILE*     3.3    13.0    -      -       -      +
    167A  GLU*     2.8    54.0    +      -       +      +
     57D  ALA*     5.9     0.4    -      -       -      +
----------------------------------------------------------
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Residues in contact with ASP 116 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    111A  ILE*     4.1    28.0    -      -       +      +
    112A  HIS      4.8     0.5    +      -       -      -
    113A  ASN*     3.2    32.6    +      -       -      +
    115A  GLN*     1.3    79.1    -      -       -      +
    117A  HIS*     1.3    63.3    +      -       -      +
    119A  LYS*     3.2    15.7    +      -       -      +
    120A  GLU*     3.0    26.4    +      -       +      +
----------------------------------------------------------
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Residues in contact with HIS 117 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     49A  GLN*     4.5     5.2    -      -       -      -
     50A  ALA*     3.4    25.1    -      -       +      -
     53A  ASN*     3.4    15.1    +      -       +      -
     54A  MET*     3.6    27.1    -      -       +      -
    107A  TYR*     2.6    32.4    +      +       -      +
    108A  PRO      4.9     1.6    -      -       -      -
    111A  ILE*     3.3    39.9    +      -       +      +
    112A  HIS*     3.3    25.1    -      -       -      -
    113A  ASN      3.2     7.1    +      -       -      -
    114A  VAL      3.2     6.7    +      -       -      +
    116A  ASP*     1.3    76.3    -      -       -      +
    118A  LEU*     1.3    57.7    +      -       -      +
    120A  GLU      3.1     0.5    +      -       -      -
    121A  LEU*     2.7    41.2    +      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 118 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     54A  MET*     5.0     0.7    -      -       +      -
     58A  ASN*     5.8     0.9    -      -       +      +
     62A  VAL*     3.8    27.4    -      -       +      -
     65A  MET*     5.1     4.0    -      -       +      -
     66A  LEU*     5.5     0.2    -      -       +      -
    114A  VAL*     2.8    34.7    +      -       +      +
    115A  GLN*     3.4    15.0    -      -       -      +
    117A  HIS*     1.3    77.3    -      -       -      +
    119A  LYS*     1.3    55.3    +      -       -      +
    121A  LEU*     4.4     9.6    -      -       +      -
    122A  ALA*     2.8    26.2    +      -       -      +
    162A  ILE*     3.3    40.0    -      -       +      +
    165A  ASN*     3.7    34.8    -      -       +      +
    166A  ILE*     4.0    10.1    -      -       +      -
----------------------------------------------------------
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Residues in contact with LYS 119 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    115A  GLN*     2.9    32.9    +      -       -      +
    116A  ASP*     3.7    13.9    +      -       -      +
    118A  LEU*     1.3    72.4    -      -       -      +
    120A  GLU*     1.3    67.3    +      -       +      +
    122A  ALA*     3.4     7.2    +      -       -      +
    123A  ASP*     3.2    30.0    +      -       -      +
    166A  ILE*     4.1    32.5    -      -       +      -
    167A  GLU      5.9     0.4    -      -       -      -
----------------------------------------------------------
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Residues in contact with GLU 120 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    107A  TYR*     3.5    24.7    -      -       +      +
    108A  PRO*     3.9    11.8    -      -       +      +
    111A  ILE*     3.7    20.7    -      -       +      +
    116A  ASP*     3.0    17.2    +      -       +      +
    117A  HIS      3.7     1.6    -      -       -      +
    119A  LYS*     1.3    77.9    -      -       +      +
    121A  LEU*     1.3    62.9    +      -       -      +
    123A  ASP*     3.4    12.2    +      -       -      +
    124A  ARG*     2.9    57.2    +      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 121 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     46A  ILE*     3.9    27.1    -      -       +      +
     47A  THR*     4.2     9.6    -      -       -      -
     50A  ALA*     3.6    32.1    -      -       +      -
     54A  MET*     4.6     0.9    -      -       +      -
     66A  LEU*     3.7    32.5    -      -       +      -
    107A  TYR*     4.0     2.5    -      -       +      +
    117A  HIS      2.7    30.7    +      -       -      +
    118A  LEU*     3.6    12.6    -      -       +      +
    120A  GLU*     1.3    71.7    -      -       -      +
    122A  ALA*     1.3    57.6    +      -       -      +
    124A  ARG*     3.1     4.5    +      -       -      -
    125A  TYR*     2.8    50.4    +      -       +      -
    162A  ILE*     4.1    11.7    -      -       +      -
----------------------------------------------------------
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Residues in contact with ALA 122 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    118A  LEU      2.8    18.9    +      -       -      +
    119A  LYS*     3.5     9.2    -      -       -      +
    121A  LEU*     1.3    75.8    -      -       -      +
    123A  ASP*     1.3    59.4    +      -       -      +
    125A  TYR*     4.5     0.7    -      -       -      -
    126A  ALA*     2.8    33.2    +      -       -      +
    159A  LEU*     3.5     9.9    -      -       +      +
    162A  ILE*     3.8    15.0    -      -       +      +
    163A  GLU*     4.3    21.1    -      -       +      +
    166A  ILE*     4.3     6.5    -      -       +      -
----------------------------------------------------------
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Residues in contact with ASP 123 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    119A  LYS*     3.2    15.8    +      -       -      +
    120A  GLU*     3.6    15.7    -      -       -      +
    121A  LEU      3.2     0.2    -      -       -      -
    122A  ALA*     1.3    79.3    -      -       -      +
    124A  ARG*     1.3    69.3    +      -       -      +
    126A  ALA*     3.3     7.1    +      -       -      +
    127A  ILE*     3.1    31.0    +      -       +      +
----------------------------------------------------------
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Residues in contact with ARG 124 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     43A  LEU*     3.8    18.8    -      -       +      -
     46A  ILE*     4.2    13.2    -      -       +      +
    104A  LEU*     3.8    19.4    -      -       +      +
    105A  LYS*     2.9    54.5    +      -       -      +
    106A  SER      3.7     3.6    +      -       -      -
    107A  TYR*     2.9    35.1    -      -       -      +
    108A  PRO*     3.6    13.9    -      -       -      +
    120A  GLU*     2.9    42.4    +      -       -      +
    121A  LEU*     3.1     6.0    +      -       -      +
    123A  ASP*     1.3    77.3    -      -       -      +
    125A  TYR*     1.3    65.8    +      -       -      +
    127A  ILE*     3.2     9.8    +      -       -      +
    128A  VAL*     3.1    26.7    +      -       -      +
----------------------------------------------------------
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Residues in contact with TYR 125 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     43A  LEU*     3.6    35.9    -      -       +      -
     47A  THR*     2.6    38.3    +      -       +      +
     66A  LEU*     5.5     0.4    -      -       +      -
     69A  PHE*     3.6    15.1    -      +       -      +
     73A  LEU*     3.5    11.2    -      -       +      +
    121A  LEU*     2.8    41.4    +      -       +      +
    122A  ALA      3.9     2.7    -      -       -      +
    124A  ARG*     1.3    72.8    -      -       -      +
    126A  ALA*     1.3    53.4    +      -       -      +
    128A  VAL*     3.6     0.7    -      -       -      +
    129A  ALA*     2.6    40.8    +      -       +      +
    155A  LEU*     4.2     9.1    -      -       +      +
    158A  PHE*     3.7    37.5    -      +       +      -
    159A  LEU*     4.2    12.8    -      -       +      -
    162A  ILE*     3.5    24.5    -      -       +      -
----------------------------------------------------------
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Residues in contact with ALA 126 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    122A  ALA      2.8    19.6    +      -       -      +
    123A  ASP*     3.5     7.9    -      -       -      +
    125A  TYR*     1.3    77.6    -      -       -      +
    127A  ILE*     1.3    58.4    +      -       +      +
    129A  ALA*     4.2     0.2    -      -       -      -
    130A  ASN*     2.8    47.8    +      -       -      +
    159A  LEU*     3.9    23.7    -      -       +      +
    163A  GLU*     5.7     1.8    -      -       -      +
----------------------------------------------------------
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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
----------------------------------------------------------
     39A  GLN*     4.3    11.0    -      -       -      +
    103A  PRO*     4.5    17.7    -      -       +      +
    104A  LEU*     3.8    24.2    -      -       +      -
    105A  LYS*     5.6     2.7    -      -       +      +
    123A  ASP*     3.1    19.5    +      -       +      +
    124A  ARG*     3.2    12.3    +      -       -      +
    126A  ALA*     1.3    77.1    -      -       +      +
    128A  VAL*     1.3    59.3    +      -       -      +
    130A  ASN*     4.0     3.7    -      -       -      +
    131A  ASP*     3.0    31.4    +      -       +      +
----------------------------------------------------------
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Residues in contact with VAL 128 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     39A  GLN*     3.3    35.6    -      -       +      +
     40A  PHE*     3.6    28.3    -      -       +      -
     43A  LEU*     4.0    17.9    -      -       +      -
    104A  LEU*     3.9    17.5    -      -       +      -
    124A  ARG      3.1    15.3    +      -       -      +
    125A  TYR      3.9     0.9    -      -       -      +
    127A  ILE*     1.3    72.4    -      -       -      +
    129A  ALA*     1.3    66.3    +      -       -      +
    131A  ASP*     3.8     0.2    -      -       -      +
    132A  VAL*     2.9    24.4    +      -       -      +
    155A  LEU*     3.5    22.9    -      -       +      -
----------------------------------------------------------
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Residues in contact with ALA 129 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    125A  TYR      2.6    24.4    +      -       -      +
    126A  ALA*     3.8     5.6    -      -       -      +
    128A  VAL*     1.3    73.4    -      -       -      +
    130A  ASN*     1.3    62.6    +      -       -      +
    132A  VAL*     3.2     7.1    -      -       -      +
    133A  ARG*     3.0    30.4    +      -       -      +
    155A  LEU*     3.8    25.3    -      -       +      +
    156A  ASP*     3.7    18.2    -      -       -      +
    159A  LEU*     4.4    10.5    -      -       +      -
----------------------------------------------------------
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Residues in contact with ASN 130 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    126A  ALA*     2.8    37.8    +      -       -      +
    127A  ILE*     4.2     3.7    -      -       -      +
    129A  ALA*     1.3    74.5    -      -       -      +
    131A  ASP*     1.3    62.9    +      -       -      +
    133A  ARG*     2.4    37.9    +      -       -      +
    134A  LYS*     3.3    45.5    +      -       -      +
    159A  LEU*     5.2     4.7    -      -       -      +
----------------------------------------------------------
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Residues in contact with ASP 131 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     35A  ARG*     2.8    41.5    +      -       -      -
     36A  GLN*     3.7     2.0    -      -       -      +
     39A  GLN*     3.0    26.2    +      -       -      +
    103A  PRO*     5.4     0.3    -      -       -      +
    127A  ILE*     3.0    21.7    +      -       +      +
    128A  VAL      3.8     2.7    -      -       -      +
    130A  ASN*     1.3    74.4    -      -       -      +
    132A  VAL*     1.3    67.5    +      -       -      +
    134A  LYS*     3.0    11.8    +      -       -      +
    135A  ALA      3.0    16.5    +      -       -      -
----------------------------------------------------------
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Residues in contact with VAL 132 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     36A  GLN*     3.7    28.9    +      -       -      +
     40A  PHE*     4.3    20.0    -      -       +      -
    128A  VAL      2.9    19.7    +      -       -      +
    129A  ALA*     3.2    16.2    -      -       -      +
    131A  ASP*     1.3    74.0    -      -       -      +
    133A  ARG*     1.3    66.6    +      -       -      +
    135A  ALA*     3.2    10.2    +      -       -      +
    136A  ILE*     3.3    14.4    +      -       -      +
    148A  LEU*     3.9    35.4    -      -       +      +
    151A  ALA*     4.7     0.7    -      -       +      -
    152A  SER*     3.9    21.5    -      -       -      +
    155A  LEU*     4.8     2.5    -      -       +      -
----------------------------------------------------------
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Residues in contact with ARG 133 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    129A  ALA*     3.0    19.9    +      -       -      +
    130A  ASN*     2.4    37.2    +      -       -      +
    131A  ASP      3.2     0.2    -      -       -      -
    132A  VAL*     1.3    76.4    -      -       -      +
    134A  LYS*     1.3    66.7    +      -       +      +
    136A  ILE*     3.4    24.9    -      -       +      +
    137A  GLY      4.4     0.7    +      -       -      -
    152A  SER*     3.6    17.0    -      -       -      +
    156A  ASP*     2.6    47.1    +      -       -      -
    159A  LEU*     6.1     1.0    -      -       -      +
----------------------------------------------------------
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Residues in contact with LYS 134 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    130A  ASN*     3.3    34.8    +      -       -      +
    131A  ASP*     3.0     9.9    +      -       -      +
    133A  ARG*     1.3    79.9    -      -       +      +
    135A  ALA*     1.3    66.7    +      -       -      +
    136A  ILE      3.0     3.5    +      -       -      -
    137A  GLY*     3.2    11.6    +      -       -      -
    138A  GLU*     3.2    14.5    +      -       -      +
----------------------------------------------------------
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Residues in contact with ALA 135 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     32A  LEU*     3.9    15.4    -      -       +      +
     35A  ARG*     4.4     3.8    -      -       -      +
     36A  GLN*     3.6    22.7    -      -       -      +
    131A  ASP      3.0     8.9    +      -       -      +
    132A  VAL*     3.2    10.3    +      -       -      +
    134A  LYS*     1.3    77.0    -      -       -      +
    136A  ILE*     1.3    57.1    +      -       -      +
    138A  GLU*     3.1    13.5    +      -       -      +
    139A  ALA*     2.8    31.7    +      -       -      +
    148A  LEU*     3.8    16.8    -      -       +      +
----------------------------------------------------------
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Residues in contact with ILE 136 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    132A  VAL      3.4     9.0    -      -       -      +
    133A  ARG*     3.4    21.5    -      -       +      +
    134A  LYS      3.0     0.2    -      -       -      -
    135A  ALA*     1.3    79.9    -      -       -      +
    137A  GLY*     1.3    62.0    +      -       -      +
    139A  ALA*     3.2    18.2    +      -       -      +
    145A  ALA*     4.0    14.4    -      -       +      +
    148A  LEU*     3.9    21.5    -      -       +      +
    149A  THR*     3.4    43.5    -      -       +      +
    152A  SER*     3.7    19.3    -      -       -      +
----------------------------------------------------------
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Residues in contact with GLY 137 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    133A  ARG      4.4     0.8    +      -       -      -
    134A  LYS*     3.2     7.8    +      -       -      +
    136A  ILE*     1.3    82.4    -      -       -      +
    138A  GLU*     1.3    60.8    +      -       -      +
    139A  ALA      3.4     4.7    +      -       -      +
----------------------------------------------------------
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Residues in contact with GLU 138 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     32A  LEU*     3.6    29.5    -      -       +      +
     35A  ARG*     3.9    12.2    +      -       -      -
    134A  LYS*     3.2    14.2    +      -       -      +
    135A  ALA*     3.1    12.3    +      -       -      +
    137A  GLY*     1.3    76.6    -      -       -      +
    139A  ALA*     1.3    62.5    +      -       -      +
    140A  LYS*     3.5    11.6    +      -       -      +
----------------------------------------------------------
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Residues in contact with ALA 139 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     32A  LEU*     4.0    15.5    -      -       +      -
    135A  ALA      2.8    11.0    +      -       -      +
    136A  ILE      3.4    17.4    -      -       -      +
    137A  GLY      3.2     5.5    -      -       -      +
    138A  GLU*     1.3    75.9    -      -       -      +
    140A  LYS*     1.3    64.0    +      -       -      +
    141A  ASP      4.4     1.8    -      -       -      +
    144A  THR*     4.4     5.8    -      -       +      -
    145A  ALA*     4.0    30.5    -      -       -      +
    148A  LEU*     4.1     5.8    -      -       +      -
----------------------------------------------------------
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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