Contacts of the helix formed by residues 113 - 139 (chain I) 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 I).
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     55I  ARG*     3.4     7.9    -      -       -      +
     56I  GLY*     5.1     4.9    -      -       -      -
     57I  ALA      5.6     0.9    +      -       -      -
    112I  HIS*     1.3    81.5    -      -       -      +
    114I  VAL*     1.3    67.5    +      -       -      +
    115I  GLN*     2.8    46.7    -      -       -      +
    116I  ASP*     3.1    34.6    +      -       -      +
    117I  HIS*     3.2    12.0    +      -       -      -
----------------------------------------------------------
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Residues in contact with VAL 114 (chain I). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     54I  MET*     4.4    12.8    -      -       +      -
     55I  ARG      2.9    37.9    +      -       -      +
     56I  GLY*     3.8     5.8    -      -       -      +
     57I  ALA      3.4    27.8    -      -       -      +
     58I  ASN*     4.4     1.3    -      -       +      +
     59I  PHE*     4.2    11.0    -      -       -      -
     62I  VAL*     4.2    24.0    -      -       +      -
    112I  HIS      4.2     1.1    -      -       -      -
    113I  ASN*     1.3    72.7    -      -       -      +
    115I  GLN*     1.3    63.6    +      -       +      +
    117I  HIS*     3.2     4.5    +      -       -      +
    118I  LEU*     2.8    46.0    +      -       +      +
----------------------------------------------------------
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Residues in contact with GLN 115 (chain I). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     57H  ALA*     5.8     0.4    -      -       -      +
     57I  ALA*     5.2     4.0    +      -       +      +
     58I  ASN*     5.9     3.4    -      -       -      +
    113I  ASN*     2.8    21.6    -      -       -      +
    114I  VAL*     1.3    77.9    -      -       +      +
    116I  ASP*     1.3    62.7    +      -       -      +
    118I  LEU*     3.3    12.0    +      -       -      +
    119I  LYS*     3.0    43.5    +      -       -      +
    165I  ASN      3.2    21.6    +      -       -      -
    166I  ILE*     3.3    13.2    -      -       -      +
    167I  GLU*     2.8    54.7    +      -       +      +
----------------------------------------------------------
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Residues in contact with ASP 116 (chain I). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    111I  ILE*     4.2    27.7    -      -       +      +
    112I  HIS      4.8     0.5    +      -       -      -
    113I  ASN*     3.1    33.7    +      -       -      +
    115I  GLN*     1.3    79.7    -      -       -      +
    117I  HIS*     1.3    63.1    +      -       -      +
    119I  LYS*     3.2    15.8    +      -       -      +
    120I  GLU*     3.0    26.4    +      -       +      +
----------------------------------------------------------
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Residues in contact with HIS 117 (chain I). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     49I  GLN*     4.6     2.0    -      -       -      -
     50I  ALA*     3.5    20.2    -      -       +      -
     53I  ASN*     3.4    17.6    +      -       +      -
     54I  MET*     3.6    27.4    -      -       +      -
    107I  TYR*     2.6    36.9    +      +       -      +
    108I  PRO      4.9     1.6    -      -       -      -
    111I  ILE*     3.3    41.2    +      -       +      +
    112I  HIS*     3.4    23.8    -      -       -      -
    113I  ASN      3.2     9.3    +      -       -      -
    114I  VAL      3.6     6.5    -      -       -      +
    116I  ASP*     1.3    78.2    -      -       -      +
    118I  LEU*     1.3    53.8    +      -       -      +
    120I  GLU      3.1     0.7    +      -       -      -
    121I  LEU*     2.7    41.5    +      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 118 (chain I). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     54I  MET*     5.0     1.3    -      -       +      -
     58I  ASN*     5.8     0.4    -      -       -      +
     62I  VAL*     3.8    28.0    -      -       +      -
     65I  MET*     5.1     4.0    -      -       +      -
     66I  LEU*     5.5     0.2    -      -       +      -
    114I  VAL*     2.8    34.4    +      -       +      +
    115I  GLN*     3.5    15.3    -      -       -      +
    117I  HIS*     1.3    77.3    -      -       -      +
    119I  LYS*     1.3    56.6    +      -       -      +
    121I  LEU*     4.4     9.9    -      -       +      -
    122I  ALA*     2.8    26.2    +      -       -      +
    162I  ILE*     3.3    39.8    -      -       +      +
    165I  ASN*     3.7    34.1    -      -       +      +
    166I  ILE*     3.9    10.5    -      -       +      +
----------------------------------------------------------
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Residues in contact with LYS 119 (chain I). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     18G  ARG*     4.4     8.2    +      -       -      +
    115I  GLN*     3.0    35.3    +      -       -      +
    116I  ASP*     3.6    12.8    +      -       -      +
    118I  LEU*     1.3    74.0    -      -       -      +
    120I  GLU*     1.3    67.5    +      -       +      +
    122I  ALA*     3.3     3.7    +      -       -      +
    123I  ASP*     3.1    29.3    +      -       -      +
    166I  ILE*     4.0    37.5    -      -       +      -
    167I  GLU      5.7     0.9    -      -       -      -
----------------------------------------------------------
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Residues in contact with GLU 120 (chain I). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    107I  TYR*     3.5    23.6    -      -       +      +
    108I  PRO*     3.9    10.6    -      -       +      +
    111I  ILE*     3.7    20.8    -      -       +      +
    116I  ASP*     3.0    19.8    +      -       +      +
    119I  LYS*     1.3    78.9    -      -       -      +
    121I  LEU*     1.3    62.3    +      -       -      +
    123I  ASP*     3.4    13.3    +      -       -      +
    124I  ARG*     2.9    53.8    +      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 121 (chain I). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     46I  ILE*     3.9    27.1    -      -       +      +
     47I  THR*     4.2     9.0    -      -       -      -
     50I  ALA*     3.6    33.7    -      -       +      -
     54I  MET*     4.7     1.3    -      -       +      -
     66I  LEU*     3.7    32.5    -      -       +      -
    107I  TYR*     4.0     3.1    -      -       +      +
    117I  HIS      2.7    30.4    +      -       -      +
    118I  LEU*     3.7    11.7    -      -       +      +
    120I  GLU*     1.3    70.3    -      -       -      +
    122I  ALA*     1.3    66.8    +      -       -      +
    124I  ARG*     3.1     4.5    +      -       -      -
    125I  TYR*     2.7    39.7    +      -       +      -
    162I  ILE*     4.1    12.1    -      -       +      -
----------------------------------------------------------
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Residues in contact with ALA 122 (chain I). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     18G  ARG*     3.5    31.1    -      -       -      +
    118I  LEU      2.8    19.1    +      -       -      +
    119I  LYS*     3.5     7.4    -      -       -      +
    121I  LEU*     1.3    75.8    -      -       -      +
    123I  ASP*     1.3    55.5    +      -       -      +
    125I  TYR*     3.5     1.3    +      -       -      -
    126I  ALA*     2.8    32.2    +      -       -      +
    159I  LEU*     3.5     9.7    -      -       -      +
    162I  ILE*     3.8    14.7    -      -       +      +
    163I  GLU*     4.3     6.5    -      -       +      -
    166I  ILE*     4.2     4.7    -      -       +      -
----------------------------------------------------------
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Residues in contact with ASP 123 (chain I). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     18G  ARG*     2.8    30.6    +      -       -      +
    119I  LYS*     3.1    13.8    +      -       -      +
    120I  GLU*     3.6    16.1    -      -       -      +
    121I  LEU      3.1     0.8    -      -       -      -
    122I  ALA*     1.3    76.1    -      -       -      +
    124I  ARG*     1.3    69.4    +      -       -      +
    126I  ALA*     3.3     4.3    +      -       -      +
    127I  ILE*     3.1    29.7    +      -       +      +
----------------------------------------------------------
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Residues in contact with ARG 124 (chain I). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     43I  LEU*     3.8    18.2    -      -       +      -
     46I  ILE*     4.1    13.4    -      -       +      +
    104I  LEU*     3.8    18.5    -      -       +      +
    105I  LYS*     2.9    49.8    +      -       -      +
    106I  SER      3.6     6.5    +      -       -      -
    107I  TYR*     2.9    36.1    -      -       -      +
    108I  PRO*     3.5    15.8    -      -       -      +
    120I  GLU*     2.9    43.1    +      -       -      +
    121I  LEU*     3.1     6.4    +      -       -      +
    123I  ASP*     1.3    78.8    -      -       -      +
    125I  TYR*     1.3    66.6    +      -       -      +
    127I  ILE*     3.2     9.2    +      -       -      +
    128I  VAL*     3.1    26.5    +      -       -      +
----------------------------------------------------------
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Residues in contact with TYR 125 (chain I). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     43I  LEU*     3.5    34.5    -      -       +      -
     47I  THR*     2.6    32.8    +      -       +      +
     66I  LEU*     5.4     0.2    -      -       +      -
     69I  PHE*     3.6    17.3    -      +       -      +
     73I  LEU*     3.5    11.9    -      -       +      +
    121I  LEU*     2.7    41.2    +      -       +      +
    122I  ALA      3.8     3.1    -      -       -      +
    124I  ARG*     1.3    73.3    -      -       -      +
    126I  ALA*     1.3    52.3    +      -       -      +
    128I  VAL*     3.3     1.0    +      -       -      +
    129I  ALA*     2.6    40.0    +      -       -      +
    155I  LEU*     4.2    10.0    -      -       +      +
    158I  PHE*     3.7    35.0    -      +       +      -
    159I  LEU*     4.1    14.1    -      -       +      -
    162I  ILE*     3.5    27.1    -      -       +      -
----------------------------------------------------------
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Residues in contact with ALA 126 (chain I). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     18G  ARG*     3.5    31.9    -      -       +      -
    122I  ALA      2.8    19.7    +      -       -      +
    123I  ASP*     3.4     5.6    -      -       -      +
    125I  TYR*     1.3    76.5    -      -       -      +
    127I  ILE*     1.3    57.7    +      -       +      +
    129I  ALA*     4.2     0.2    -      -       -      -
    130I  ASN*     2.8    45.0    +      -       -      +
    159I  LEU*     3.9    15.2    -      -       +      +
----------------------------------------------------------
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Residues in contact with ILE 127 (chain I). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     39I  GLN*     4.3    11.0    -      -       -      +
    103I  PRO*     4.5    17.5    -      -       +      +
    104I  LEU*     3.9    23.8    -      -       +      -
    105I  LYS*     5.5     2.9    -      -       +      +
    123I  ASP*     3.1    19.4    +      -       +      +
    124I  ARG*     3.2    12.8    +      -       -      +
    126I  ALA*     1.3    76.7    -      -       +      +
    128I  VAL*     1.3    62.4    +      -       -      +
    130I  ASN*     4.2     3.9    -      -       -      +
    131I  ASP*     3.0    27.5    +      -       +      +
----------------------------------------------------------
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Residues in contact with VAL 128 (chain I). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     39I  GLN*     3.4    34.9    -      -       +      +
     40I  PHE*     3.7    28.3    -      -       +      -
     43I  LEU*     4.0    16.8    -      -       +      -
    104I  LEU*     3.9    18.2    -      -       +      -
    124I  ARG      3.1    13.9    +      -       -      +
    125I  TYR      3.8     4.9    -      -       -      +
    127I  ILE*     1.3    72.6    -      -       -      +
    129I  ALA*     1.3    60.6    +      -       -      +
    131I  ASP*     3.7     0.3    -      -       -      +
    132I  VAL*     2.9    33.4    +      -       -      +
    155I  LEU*     3.5    21.3    -      -       +      -
----------------------------------------------------------
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Residues in contact with ALA 129 (chain I). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    125I  TYR      2.6    24.0    +      -       -      +
    126I  ALA*     3.7     5.6    -      -       -      +
    128I  VAL*     1.3    72.0    -      -       -      +
    130I  ASN*     1.3    63.3    +      -       -      +
    132I  VAL*     3.2    10.3    -      -       -      +
    133I  ARG*     3.0    30.6    +      -       -      +
    155I  LEU*     3.8    20.3    -      -       +      +
    156I  ASP*     3.7    18.1    -      -       -      +
    159I  LEU*     4.4    12.8    -      -       +      -
----------------------------------------------------------
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Residues in contact with ASN 130 (chain I). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     18G  ARG      3.1    19.8    +      -       -      -
     19G  ASN*     3.5     4.4    -      -       -      -
     20G  ASP*     2.8    36.8    +      -       -      +
    126I  ALA*     2.8    33.5    +      -       -      +
    127I  ILE*     4.2     2.8    -      -       -      +
    129I  ALA*     1.3    74.3    -      -       -      +
    131I  ASP*     1.3    62.4    +      -       -      +
    133I  ARG*     2.5    35.9    +      -       -      +
    134I  LYS*     3.3    32.9    +      -       -      +
----------------------------------------------------------
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Residues in contact with ASP 131 (chain I). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     35I  ARG*     2.9    40.4    +      -       -      -
     36I  GLN*     3.7     2.5    -      -       -      +
     39I  GLN*     3.0    26.7    +      -       -      +
    127I  ILE*     3.0    21.6    +      -       +      +
    128I  VAL      3.7     2.5    -      -       -      +
    130I  ASN*     1.3    76.1    -      -       -      +
    132I  VAL*     1.3    66.1    +      -       -      +
    134I  LYS*     3.0    11.2    +      -       -      +
    135I  ALA*     3.0    17.3    +      -       -      +
----------------------------------------------------------
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Residues in contact with VAL 132 (chain I). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     36I  GLN*     3.7    28.9    +      -       -      +
     40I  PHE*     4.3    19.1    -      -       +      -
    128I  VAL      2.9    19.3    +      -       -      +
    129I  ALA*     3.2    17.0    -      -       -      +
    131I  ASP*     1.3    73.6    -      -       -      +
    133I  ARG*     1.3    66.8    +      -       -      +
    135I  ALA*     3.1    10.8    +      -       -      +
    136I  ILE*     3.3    12.6    +      -       -      +
    148I  LEU*     3.9    36.6    -      -       +      +
    151I  ALA*     4.7     0.7    -      -       +      -
    152I  SER*     3.9    20.9    -      -       -      +
    155I  LEU*     4.8     2.9    -      -       +      -
----------------------------------------------------------
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Residues in contact with ARG 133 (chain I). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     19G  ASN*     3.0    23.0    +      -       -      +
     20G  ASP*     3.2    13.5    +      -       -      -
     21G  VAL*     3.3    18.3    -      -       -      +
     83G  ARG*     4.0     9.6    -      -       -      +
    141G  ASP*     4.3     7.0    -      -       -      +
    142G  ASP*     4.4     8.1    -      -       +      +
    143G  ASP*     3.9     9.9    -      -       -      +
    129I  ALA*     3.0    14.3    +      -       -      +
    130I  ASN*     2.5    34.2    +      -       -      +
    131I  ASP      3.2     0.2    -      -       -      -
    132I  VAL*     1.3    82.6    -      -       -      +
    134I  LYS*     1.3    63.1    +      -       +      +
    136I  ILE*     3.4    24.5    -      -       +      +
    137I  GLY      4.4     0.2    +      -       -      -
    152I  SER*     3.6    14.1    -      -       -      +
    156I  ASP*     2.6    44.2    +      -       -      -
----------------------------------------------------------
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Residues in contact with LYS 134 (chain I). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     20G  ASP*     2.5    42.4    +      -       -      -
    130I  ASN*     3.3    22.4    +      -       -      +
    131I  ASP*     3.0    10.5    +      -       -      +
    133I  ARG*     1.3    77.6    -      -       +      +
    135I  ALA*     1.3    65.5    +      -       -      +
    136I  ILE      3.0     3.7    +      -       -      -
    137I  GLY*     3.1    12.0    +      -       -      -
    138I  GLU*     3.3    14.2    +      -       -      +
----------------------------------------------------------
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Residues in contact with ALA 135 (chain I). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     32I  LEU*     3.9    19.6    -      -       +      +
     35I  ARG*     4.3     3.6    -      -       -      +
     36I  GLN*     3.6    23.3    -      -       -      +
    131I  ASP      3.0     8.9    +      -       -      +
    132I  VAL*     3.1    10.5    +      -       -      +
    134I  LYS*     1.3    77.0    -      -       -      +
    136I  ILE*     1.3    56.8    +      -       -      +
    138I  GLU*     3.4    13.5    +      -       -      +
    139I  ALA*     2.8    31.9    +      -       -      +
    148I  LEU*     3.7    12.2    -      -       +      +
----------------------------------------------------------
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Residues in contact with ILE 136 (chain I). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    142G  ASP*     3.8    27.6    -      -       +      +
    143G  ASP*     3.4    25.8    -      -       -      +
    132I  VAL      3.5     8.7    -      -       -      +
    133I  ARG*     3.4    20.0    -      -       +      +
    134I  LYS      3.0     0.6    -      -       -      -
    135I  ALA*     1.3    77.9    -      -       -      +
    137I  GLY*     1.3    62.7    +      -       -      +
    139I  ALA*     3.2    21.0    +      -       -      +
    145I  ALA*     4.0    14.1    -      -       +      +
    148I  LEU*     3.9    21.1    -      -       +      -
    149I  THR*     3.4    30.7    -      -       -      +
    152I  SER*     3.7    11.0    -      -       -      +
----------------------------------------------------------
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Residues in contact with GLY 137 (chain I). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    142G  ASP*     4.3    10.2    +      -       -      -
    133I  ARG      4.4     0.4    +      -       -      -
    134I  LYS      3.1     7.4    +      -       -      -
    136I  ILE*     1.3    81.8    -      -       -      +
    138I  GLU*     1.3    59.4    +      -       -      +
    139I  ALA      3.4     5.1    +      -       -      +
----------------------------------------------------------
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Residues in contact with GLU 138 (chain I). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     32I  LEU*     3.6    28.3    -      -       +      +
     35I  ARG*     3.8    13.5    +      -       -      -
    134I  LYS*     3.3    12.8    +      -       -      +
    135I  ALA*     3.1    13.1    +      -       -      +
    137I  GLY*     1.3    76.6    -      -       -      +
    139I  ALA*     1.3    61.1    +      -       -      +
    140I  LYS*     3.5    12.0    +      -       -      +
----------------------------------------------------------
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Residues in contact with ALA 139 (chain I). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     32I  LEU*     4.0    11.2    -      -       +      -
    135I  ALA      2.8    11.3    +      -       -      +
    136I  ILE      3.2    18.1    +      -       -      +
    137I  GLY      4.1     4.4    -      -       -      +
    138I  GLU*     1.3    76.8    -      -       -      +
    140I  LYS*     1.3    63.6    +      -       -      +
    141I  ASP      4.4     0.7    -      -       -      +
    144I  THR*     4.4     6.3    -      -       +      -
    145I  ALA*     3.9    30.9    -      -       +      +
    148I  LEU*     4.1    10.3    -      -       +      -
----------------------------------------------------------
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A short description of the analytical approach
The contact analysis used in this page is based upon the approach developed in: Sobolev V., Wade R.C., Vriend G. and Edelman M. PROTEINS (1996) 25, 120-129. Contact legitimacy depends on the hydrophobic-hydrophilic properties of the contacting atoms. In order to define it, for each inter-atomic contact, eight atom classes have been introduced:


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

Legend:
+, legitimate
-, illegitimate
------------------------------------------------------------
  Atomic class           I  II  III   IV   V   VI  VII  VIII
------------------------------------------------------------
   I  (Hydrophilic)      +   +    +    -   +   +    +    +
  II  (Acceptor)         +   -    +    -   +   +    +    -
 III  (Donor)            +   +    -    -   +   +    -    +
  IV  (Hydrophobic)      -   -    -    +   +   +    +    +
   V  (Aromatic)         +   +    +    +   +   +    +    +
  VI  (Neutral)          +   +    +    +   +   +    +    +
 VII  (Neutral-donor)    +   +    -    +   +   +    -    +
VIII  (Neutral-acceptor) +   -    +    +   +   +    +    -
------------------------------------------------------------
Warning!
Atom classes for heterogroups are automatically assigned based on the atomic coordinates. However, in three cases (see below) the automatic assignment is currently ambiguous. In these cases, the user is advised to manually analyse the full list of contacts using LPC software.
1. Carbon atoms belonging to a 4-, 5- or 6-member ring are 
   considered "aromatic" (Class V) if the ring is approximately
   planar, and "hydrophobic" (Class IV) or "neutral" (Classes
   VI, VII, VIII) if the ring is non-planar.
2. The oxygen atom of a carbonyl or hydroxy group is considered
   "hydroxy" (Class I) if the CO bond is longer than 1.29 Å, and
   "carbonyl" (Class II) if shorter.
3. All nitrogen atoms are considered "hydrophilic" (Class I).

Please E-mail any questions and/or suggestions concerning this page to Vladimir.Sobolev@weizmann.ac.il