Contacts of the helix formed by residues 113 - 139 (chain F) 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 F).
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     55F  ARG*     3.5     8.7    -      -       -      +
     56F  GLY*     5.1     4.7    -      -       -      -
     57F  ALA      5.6     0.9    +      -       -      -
    112F  HIS*     1.3    80.1    -      -       -      +
    114F  VAL*     1.3    66.0    +      -       -      +
    115F  GLN*     2.8    47.1    -      -       -      +
    116F  ASP*     3.1    35.4    +      -       -      +
    117F  HIS*     3.2    12.3    +      -       -      -
----------------------------------------------------------
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Residues in contact with VAL 114 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     54F  MET*     4.3    12.8    -      -       +      -
     55F  ARG      2.9    38.1    +      -       -      +
     56F  GLY      3.9     5.2    -      -       -      +
     57F  ALA      3.4    28.3    -      -       -      +
     58F  ASN*     4.3     1.8    -      -       +      +
     59F  PHE*     4.1    11.2    -      -       -      -
     62F  VAL*     4.3    23.3    -      -       +      -
    112F  HIS      4.2     0.9    -      -       -      -
    113F  ASN*     1.3    73.8    +      -       -      +
    115F  GLN*     1.3    63.0    +      -       +      +
    117F  HIS*     3.3     4.3    +      -       -      +
    118F  LEU*     2.9    45.6    +      -       +      +
----------------------------------------------------------
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Residues in contact with GLN 115 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     57F  ALA*     5.2     5.0    +      -       +      +
     58F  ASN*     5.9     2.8    -      -       -      +
    113F  ASN*     2.8    23.6    -      -       -      +
    114F  VAL*     1.3    78.0    -      -       +      +
    116F  ASP*     1.3    61.1    +      -       -      +
    118F  LEU*     3.5    13.3    -      -       -      +
    119F  LYS*     3.0    42.1    +      -       -      +
    165F  ASN      3.2    20.8    +      -       -      -
    166F  ILE*     3.2    13.6    -      -       -      +
    167F  GLU*     2.7    54.4    +      -       +      +
----------------------------------------------------------
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Residues in contact with ASP 116 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    111F  ILE*     4.1    27.8    -      -       +      +
    112F  HIS      4.8     0.7    +      -       -      -
    113F  ASN*     3.1    33.4    +      -       -      +
    115F  GLN*     1.3    79.7    -      -       -      +
    117F  HIS*     1.3    62.5    +      -       -      +
    119F  LYS*     3.2    16.2    +      -       -      +
    120F  GLU*     3.0    26.0    +      -       +      +
----------------------------------------------------------
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Residues in contact with HIS 117 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     49F  GLN*     4.5     4.7    -      -       -      -
     50F  ALA*     3.5    23.9    -      -       +      -
     53F  ASN*     3.3    14.9    +      -       +      -
     54F  MET*     3.7    28.5    -      -       +      -
    107F  TYR*     2.6    32.4    +      +       -      +
    108F  PRO      4.9     1.6    -      -       -      -
    111F  ILE*     3.3    38.8    +      -       +      +
    112F  HIS*     3.4    24.0    -      -       -      -
    113F  ASN      3.2     8.7    +      -       -      -
    114F  VAL      3.6     5.8    -      -       -      +
    116F  ASP*     1.3    78.6    -      -       -      +
    118F  LEU*     1.3    57.8    +      -       -      +
    120F  GLU      3.2     0.2    +      -       -      -
    121F  LEU*     2.8    37.1    +      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 118 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     54F  MET*     5.0     1.1    -      -       +      -
     58F  ASN*     5.8     0.4    -      -       -      +
     62F  VAL*     3.8    27.8    -      -       +      -
     65F  MET*     5.1     3.8    -      -       +      -
     66F  LEU*     5.5     0.4    -      -       +      -
    114F  VAL*     2.9    27.4    +      -       +      +
    115F  GLN*     3.5    21.1    -      -       -      +
    117F  HIS*     1.3    77.1    -      -       -      +
    119F  LYS*     1.3    57.9    +      -       -      +
    121F  LEU*     3.7     9.6    -      -       +      +
    122F  ALA*     2.9    24.9    +      -       -      +
    162F  ILE*     3.3    40.0    -      -       +      +
    165F  ASN*     3.7    35.2    -      -       +      +
    166F  ILE*     3.9    10.8    -      -       +      +
----------------------------------------------------------
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Residues in contact with LYS 119 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    115F  GLN*     3.0    34.6    +      -       -      +
    116F  ASP*     3.6    13.2    +      -       -      +
    118F  LEU*     1.3    73.2    -      -       -      +
    120F  GLU*     1.3    66.8    +      -       +      +
    122F  ALA*     3.3     3.4    +      -       -      +
    123F  ASP*     3.1    30.0    +      -       -      +
    166F  ILE*     4.0    36.6    -      -       +      -
    167F  GLU      5.8     0.4    -      -       -      -
----------------------------------------------------------
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Residues in contact with GLU 120 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    107F  TYR*     3.4    25.1    -      -       +      +
    108F  PRO*     3.9    10.8    -      -       +      +
    111F  ILE*     3.6    21.8    -      -       +      +
    116F  ASP*     3.0    18.9    +      -       +      +
    119F  LYS*     1.3    78.8    -      -       -      +
    121F  LEU*     1.3    63.1    +      -       -      +
    123F  ASP*     3.4    12.9    +      -       -      +
    124F  ARG*     2.9    52.6    +      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 121 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     46F  ILE*     3.8    27.6    -      -       +      +
     47F  THR*     4.3     8.7    -      -       -      -
     50F  ALA*     3.6    32.1    -      -       +      -
     54F  MET*     4.7     0.4    -      -       +      -
     66F  LEU*     3.7    32.5    -      -       +      -
    107F  TYR*     4.0     2.9    -      -       +      +
    117F  HIS      2.8    31.2    +      -       -      +
    118F  LEU*     3.7    11.9    -      -       +      +
    120F  GLU*     1.3    72.0    -      -       -      +
    122F  ALA*     1.3    60.8    -      -       -      +
    124F  ARG*     3.2     4.1    +      -       -      +
    125F  TYR*     2.8    46.2    +      -       +      -
    162F  ILE*     4.1    12.6    -      -       +      -
----------------------------------------------------------
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Residues in contact with ALA 122 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    118F  LEU      2.9    18.7    +      -       -      +
    119F  LYS*     3.3     9.8    +      -       -      +
    121F  LEU*     1.3    74.6    -      -       -      +
    123F  ASP*     1.3    61.3    +      -       -      +
    125F  TYR*     4.6     0.7    -      -       -      -
    126F  ALA*     2.8    32.5    +      -       -      +
    159F  LEU*     3.5    10.4    -      -       +      +
    162F  ILE*     3.9    14.8    -      -       +      +
    163F  GLU*     4.3    17.0    -      -       +      +
    166F  ILE*     4.3    11.0    -      -       +      -
----------------------------------------------------------
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Residues in contact with ASP 123 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    119F  LYS*     3.1    16.5    +      -       -      +
    120F  GLU*     3.5    16.3    -      -       -      +
    121F  LEU      3.1     0.2    -      -       -      -
    122F  ALA*     1.3    80.5    -      -       -      +
    124F  ARG*     1.3    69.3    +      -       -      +
    126F  ALA*     3.3     7.2    +      -       -      +
    127F  ILE*     3.1    29.8    +      -       +      +
----------------------------------------------------------
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Residues in contact with ARG 124 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     43F  LEU*     3.8    18.6    -      -       +      -
     46F  ILE*     4.1    12.1    -      -       +      +
    104F  LEU*     3.8    17.6    -      -       +      +
    105F  LYS*     2.9    51.4    +      -       -      +
    106F  SER      3.7     6.1    +      -       -      -
    107F  TYR*     2.8    36.1    -      -       -      +
    108F  PRO*     3.5    15.4    -      -       -      +
    120F  GLU*     2.9    41.5    +      -       -      +
    121F  LEU*     3.2     5.7    +      -       -      +
    123F  ASP*     1.3    80.3    -      -       -      +
    125F  TYR*     1.3    64.3    +      -       -      +
    127F  ILE*     3.2    10.2    +      -       -      +
    128F  VAL*     3.1    25.6    +      -       -      +
----------------------------------------------------------
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Residues in contact with TYR 125 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     43F  LEU*     3.5    37.0    -      -       +      -
     47F  THR*     2.7    31.6    +      -       +      +
     69F  PHE*     3.6    18.8    -      +       -      +
     73F  LEU*     3.5    12.2    -      -       +      +
    121F  LEU*     2.8    41.4    +      -       +      +
    122F  ALA      3.9     2.9    -      -       -      +
    124F  ARG*     1.3    72.4    -      -       -      +
    126F  ALA*     1.3    53.5    +      -       -      +
    128F  VAL*     3.3     1.0    +      -       -      +
    129F  ALA*     2.6    40.0    +      -       -      +
    155F  LEU*     4.2     9.3    -      -       +      +
    158F  PHE*     3.8    35.4    -      +       +      -
    159F  LEU*     4.2    13.7    -      -       +      -
    162F  ILE*     3.6    28.9    -      -       +      -
----------------------------------------------------------
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Residues in contact with ALA 126 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    122F  ALA      2.8    20.2    +      -       -      +
    123F  ASP*     3.4     7.6    -      -       -      +
    125F  TYR*     1.3    77.1    -      -       -      +
    127F  ILE*     1.3    57.4    +      -       +      +
    129F  ALA*     4.1     0.4    -      -       -      -
    130F  ASN*     2.7    48.1    +      -       -      +
    159F  LEU*     4.0    23.3    -      -       +      +
    163F  GLU*     5.7     1.6    -      -       -      +
----------------------------------------------------------
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Residues in contact with ILE 127 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     39F  GLN*     4.3    10.5    -      -       -      +
    103F  PRO*     4.5    17.7    -      -       +      +
    104F  LEU*     3.8    24.9    -      -       +      -
    105F  LYS*     5.5     3.4    -      -       +      +
    123F  ASP*     3.1    17.9    +      -       +      +
    124F  ARG*     3.2    14.5    +      -       -      +
    126F  ALA*     1.3    76.7    -      -       +      +
    128F  VAL*     1.3    57.5    +      -       -      +
    130F  ASN*     4.1     3.6    -      -       -      +
    131F  ASP*     3.0    33.0    +      -       +      +
----------------------------------------------------------
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Residues in contact with VAL 128 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     39F  GLN*     3.4    35.4    -      -       +      +
     40F  PHE*     3.6    28.3    -      -       +      -
     43F  LEU*     3.9    17.3    -      -       +      -
    104F  LEU*     3.9    17.9    -      -       +      -
    124F  ARG      3.1    13.3    +      -       -      +
    125F  TYR      3.8     3.1    -      -       -      +
    127F  ILE*     1.3    71.4    -      -       -      +
    129F  ALA*     1.3    66.2    +      -       -      +
    131F  ASP*     3.7     0.2    -      -       -      +
    132F  VAL*     2.9    25.1    +      -       -      +
    155F  LEU*     3.4    23.1    -      -       +      -
----------------------------------------------------------
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Residues in contact with ALA 129 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    125F  TYR      2.6    25.2    +      -       -      +
    126F  ALA*     3.7     6.1    -      -       -      +
    128F  VAL*     1.3    73.6    -      -       -      +
    130F  ASN*     1.3    63.8    +      -       -      +
    132F  VAL*     3.3     6.9    -      -       -      +
    133F  ARG*     3.0    30.4    +      -       -      +
    152F  SER*     4.8     0.2    +      -       -      -
    155F  LEU*     3.8    25.1    -      -       +      +
    156F  ASP*     3.7    18.1    -      -       -      +
    159F  LEU*     4.4    10.5    -      -       +      -
----------------------------------------------------------
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Residues in contact with ASN 130 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    126F  ALA*     2.7    40.0    +      -       -      +
    127F  ILE*     4.1     3.1    -      -       -      +
    129F  ALA*     1.3    74.2    -      -       -      +
    131F  ASP*     1.3    60.3    +      -       -      +
    133F  ARG*     2.4    36.7    +      -       -      +
    134F  LYS*     3.3    46.1    +      -       -      +
    159F  LEU*     5.3     5.0    -      -       -      +
----------------------------------------------------------
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Residues in contact with ASP 131 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     35F  ARG*     2.9    40.3    +      -       -      -
     36F  GLN*     3.7     2.3    -      -       -      +
     39F  GLN*     3.0    26.0    +      -       -      +
    103F  PRO*     5.8     0.5    -      -       -      +
    127F  ILE*     3.0    22.3    +      -       +      +
    128F  VAL      3.7     3.1    -      -       -      +
    130F  ASN*     1.3    74.1    -      -       -      +
    132F  VAL*     1.3    66.2    +      -       -      +
    134F  LYS*     3.0    11.8    +      -       -      +
    135F  ALA      3.0    17.2    +      -       -      -
----------------------------------------------------------
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Residues in contact with VAL 132 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     36F  GLN*     3.6    32.5    +      -       -      +
     40F  PHE*     4.3    19.5    -      -       +      -
    128F  VAL      2.9    23.9    +      -       -      +
    129F  ALA*     3.3    11.9    -      -       -      +
    131F  ASP*     1.3    73.4    +      -       -      +
    133F  ARG*     1.3    67.2    +      -       -      +
    135F  ALA*     3.1    10.0    +      -       -      +
    136F  ILE*     3.3    13.9    +      -       -      +
    148F  LEU*     3.9    31.4    -      -       +      +
    151F  ALA*     4.7     1.8    -      -       +      -
    152F  SER*     3.9    20.9    -      -       -      +
    155F  LEU*     4.8     2.9    -      -       +      -
----------------------------------------------------------
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Residues in contact with ARG 133 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    129F  ALA*     3.0    20.3    +      -       -      +
    130F  ASN*     2.4    36.8    +      -       -      +
    131F  ASP      3.1     0.2    -      -       -      -
    132F  VAL*     1.3    77.2    -      -       -      +
    134F  LYS*     1.3    67.1    +      -       +      +
    136F  ILE*     3.4    24.8    -      -       +      +
    137F  GLY      4.3     0.9    +      -       -      -
    152F  SER*     3.6    16.6    -      -       -      +
    156F  ASP*     2.6    45.7    +      -       -      -
    159F  LEU*     6.2     0.4    -      -       -      +
----------------------------------------------------------
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Residues in contact with LYS 134 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    130F  ASN*     3.3    36.2    +      -       -      +
    131F  ASP*     3.0     9.4    +      -       -      +
    133F  ARG*     1.3    79.4    -      -       +      +
    135F  ALA*     1.3    67.1    +      -       -      +
    136F  ILE      3.0     3.3    +      -       -      -
    137F  GLY*     3.2    11.6    +      -       -      -
    138F  GLU*     3.2    14.3    +      -       -      +
----------------------------------------------------------
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Residues in contact with ALA 135 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     32F  LEU*     3.9    20.3    -      -       +      +
     35F  ARG*     4.3     3.4    -      -       -      +
     36F  GLN*     3.6    22.4    -      -       -      +
    131F  ASP      3.0     8.1    +      -       -      +
    132F  VAL*     3.1    10.3    +      -       -      +
    134F  LYS*     1.3    78.3    -      -       -      +
    136F  ILE*     1.3    56.2    +      -       -      +
    138F  GLU*     3.1    13.6    +      -       -      +
    139F  ALA*     2.8    32.2    +      -       -      +
    148F  LEU*     3.8    12.9    -      -       +      +
----------------------------------------------------------
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Residues in contact with ILE 136 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    132F  VAL      3.4     8.5    -      -       -      +
    133F  ARG*     3.4    21.1    -      -       +      +
    134F  LYS      3.0     0.4    -      -       -      -
    135F  ALA*     1.3    80.2    -      -       -      +
    137F  GLY*     1.3    63.6    +      -       -      +
    139F  ALA*     3.2    17.9    +      -       -      +
    145F  ALA*     4.0    14.5    -      -       +      +
    148F  LEU*     4.0    22.2    -      -       +      +
    149F  THR*     3.4    42.2    -      -       +      +
    152F  SER*     3.7    19.1    -      -       -      +
----------------------------------------------------------
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Residues in contact with GLY 137 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    133F  ARG      4.3     0.8    +      -       -      -
    134F  LYS*     3.2     7.2    +      -       -      +
    136F  ILE*     1.3    81.0    -      -       -      +
    138F  GLU*     1.3    60.2    +      -       -      +
    139F  ALA      3.4     5.2    +      -       -      +
----------------------------------------------------------
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Residues in contact with GLU 138 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     32F  LEU*     3.7    28.3    -      -       +      +
     35F  ARG*     3.8    14.6    +      -       -      -
    134F  LYS*     3.2    12.8    +      -       -      +
    135F  ALA*     3.1    13.0    +      -       -      +
    137F  GLY*     1.3    76.1    -      -       -      +
    139F  ALA*     1.3    62.2    +      -       -      +
    140F  LYS*     3.5    11.6    +      -       -      +
----------------------------------------------------------
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Residues in contact with ALA 139 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     32F  LEU*     4.0    15.9    -      -       +      -
    135F  ALA      2.8    10.6    +      -       -      +
    136F  ILE      3.4    16.9    -      -       -      +
    137F  GLY      3.2     6.0    -      -       -      +
    138F  GLU*     1.3    77.2    -      -       -      +
    140F  LYS*     1.3    64.8    +      -       -      +
    141F  ASP      4.4     1.1    -      -       -      +
    144F  THR*     4.3     7.2    -      -       +      -
    145F  ALA*     4.0    29.9    -      -       +      +
    148F  LEU*     4.1     5.4    -      -       +      -
----------------------------------------------------------
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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