Contacts of the helix formed by residues 114 - 139 (chain A) in PDB entry 1HPL


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 TYR 114 (chain A).
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    112A  THR      3.6     1.6    +      -       -      -
    113A  ALA*     1.3    71.4    -      -       -      +
    115A  SER*     1.3    64.4    +      -       -      +
    117A  ALA*     3.2     2.7    +      -       -      +
    118A  SER*     3.0    40.4    +      -       -      -
    153A  LEU*     3.3    27.9    -      -       +      +
    178A  ALA*     3.5    14.4    -      -       -      +
    180A  PRO*     2.8    42.4    +      -       +      +
    181A  CYS*     3.9    10.1    -      -       -      -
    215A  PHE*     3.7    24.7    -      +       -      -
    248A  ILE*     3.5    28.5    -      -       +      -
    249A  ASP*     3.0    19.3    +      -       -      +
    252A  TRP*     3.6    42.2    -      +       +      -
----------------------------------------------------------
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Residues in contact with SER 115 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     25A  LEU*     3.7    29.2    -      -       -      +
     27A  ILE*     3.6    10.9    -      -       -      +
    113A  ALA*     4.5     7.8    -      -       -      +
    114A  TYR*     1.3    82.0    -      -       -      +
    116A  GLN*     1.3    61.1    +      -       -      +
    118A  SER*     3.6     8.9    +      -       -      -
    119A  GLN*     3.3    26.2    +      -       -      +
    181A  CYS*     4.9    11.4    -      -       -      -
    248A  ILE*     5.8     0.4    -      -       -      +
    249A  ASP*     4.4     3.5    +      -       -      -
----------------------------------------------------------
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Residues in contact with GLN 116 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     27A  ILE*     3.5    21.2    -      -       +      +
     28A  LEU      2.9    26.3    +      -       -      +
     29A  PRO*     3.7     1.2    -      -       -      +
     30A  TRP*     3.3    40.6    +      -       +      +
    112A  THR*     3.9    15.3    -      -       +      +
    113A  ALA*     2.9    15.9    +      -       +      +
    115A  SER*     1.3    79.3    +      -       -      +
    117A  ALA*     1.3    60.2    +      -       -      +
    119A  GLN*     3.1     4.9    +      -       -      +
    120A  ASN*     2.8    54.1    +      -       -      +
----------------------------------------------------------
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Residues in contact with ALA 117 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    106A  TRP*     3.9     3.0    -      -       +      -
    109A  GLY      3.8    17.3    -      -       -      +
    110A  SER*     3.9    22.9    -      -       -      +
    112A  THR*     3.8     2.1    -      -       +      +
    113A  ALA      2.9    10.8    +      -       -      +
    114A  TYR      3.5     8.1    -      -       -      +
    116A  GLN*     1.3    75.8    -      -       -      +
    118A  SER*     1.4    57.0    +      -       -      +
    120A  ASN*     2.9    17.3    +      -       -      +
    121A  VAL*     3.0    17.0    +      -       -      +
    153A  LEU*     3.6    20.4    -      -       +      -
    252A  TRP*     4.0     7.9    -      -       -      +
----------------------------------------------------------
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Residues in contact with SER 118 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     23A  ARG*     4.5     9.2    +      -       -      -
    114A  TYR*     3.0    37.4    +      -       -      -
    115A  SER*     3.6    12.3    -      -       -      -
    116A  GLN      3.2     0.4    -      -       -      -
    117A  ALA*     1.4    72.6    -      -       -      +
    119A  GLN*     1.3    65.5    +      -       -      +
    121A  VAL*     3.2    23.1    -      -       -      +
    122A  ARG*     4.6     1.7    -      -       -      +
    153A  LEU*     3.7     6.1    -      -       -      +
    181A  CYS*     4.1     9.3    -      -       -      +
    182A  PHE*     3.6    29.7    -      -       -      -
----------------------------------------------------------
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Residues in contact with GLN 119 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     13A  ASP*     6.4     0.4    -      -       -      -
     17A  TRP      2.9    25.8    +      -       -      +
     18A  ALA*     4.3     6.9    -      -       -      +
     23A  ARG*     3.5    15.3    +      -       -      +
     25A  LEU      5.0     2.2    +      -       -      -
     27A  ILE*     3.5    34.5    +      -       +      +
     29A  PRO*     3.7    23.8    -      -       +      +
    115A  SER      3.3    13.2    +      -       -      +
    116A  GLN*     3.1    11.8    +      -       -      +
    118A  SER*     1.3    79.5    -      -       -      +
    120A  ASN*     1.3    62.0    +      -       -      +
    122A  ARG*     3.0    56.9    +      -       -      +
----------------------------------------------------------
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Residues in contact with ASN 120 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     29A  PRO*     3.5     5.5    -      -       -      +
     30A  TRP*     3.0    43.8    +      -       -      -
     34A  VAL*     3.9    15.0    -      -       +      +
    106A  TRP*     4.3     5.8    -      -       +      -
    109A  GLY*     3.0    28.4    +      -       -      +
    112A  THR*     4.3     0.2    -      -       -      +
    116A  GLN*     2.8    44.5    +      -       -      +
    117A  ALA      2.9     8.0    +      -       -      +
    119A  GLN*     1.3    71.8    -      -       -      +
    121A  VAL*     1.3    62.8    +      -       -      +
    123A  ILE*     3.0    18.0    +      -       -      +
    124A  VAL*     3.4    13.7    +      -       -      +
----------------------------------------------------------
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Residues in contact with VAL 121 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    106A  TRP*     4.0    11.9    -      -       +      -
    117A  ALA      3.0     6.8    +      -       -      +
    118A  SER      3.2    18.2    -      -       -      +
    120A  ASN*     1.3    75.7    -      -       -      +
    122A  ARG*     1.3    60.2    +      -       +      +
    124A  VAL*     3.4     5.0    +      -       -      -
    125A  GLY*     3.0    25.8    +      -       -      -
    153A  LEU*     3.4    43.7    -      -       +      +
    156A  HIS*     4.0    15.3    -      -       +      +
    157A  ALA*     3.7    30.4    -      -       +      +
    160A  GLU*     4.5     2.9    -      -       +      +
    182A  PHE*     4.5     7.2    -      -       +      -
    189A  VAL      5.8     1.3    -      -       -      +
----------------------------------------------------------
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Residues in contact with ARG 122 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     10A  CYS      5.2     0.2    +      -       -      -
     11A  PHE*     3.7    47.0    -      -       +      +
     12A  SER      2.8    31.9    +      -       -      +
     13A  ASP*     4.7     1.2    -      -       -      +
     17A  TRP*     3.4    61.2    -      -       +      +
     23A  ARG*     6.0     1.1    -      -       -      +
     28A  LEU*     5.1     0.2    -      -       -      +
     29A  PRO*     4.1    13.0    -      -       +      +
    118A  SER      4.6     3.4    -      -       -      +
    119A  GLN*     3.0    42.4    +      -       -      +
    121A  VAL*     1.3    80.3    -      -       +      +
    123A  ILE*     1.3    58.3    +      -       -      +
    126A  ALA*     3.0    27.9    +      -       -      +
    160A  GLU*     3.9    19.7    +      -       -      +
    164A  ARG*     6.0     0.2    -      -       -      +
----------------------------------------------------------
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Residues in contact with ILE 123 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
      5A  TYR*     5.2     2.5    -      -       +      -
      8A  LEU*     4.3     8.1    -      -       +      -
     11A  PHE*     3.8    31.4    -      -       +      -
     29A  PRO*     3.7    19.3    -      -       +      -
     30A  TRP      3.5    26.2    -      -       -      +
     31A  PRO*     4.0    34.3    -      -       +      +
     34A  VAL*     4.0    22.2    -      -       +      -
     36A  THR*     4.7     0.2    -      -       -      +
    120A  ASN*     3.0     9.5    +      -       -      +
    122A  ARG*     1.3    74.5    -      -       -      +
    124A  VAL*     1.3    65.3    +      -       -      +
    126A  ALA*     3.2     5.7    +      -       -      +
    127A  GLU*     2.9    33.0    +      -       +      +
----------------------------------------------------------
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Residues in contact with VAL 124 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     34A  VAL*     3.9     9.2    -      -       +      -
     36A  THR*     4.0    11.4    -      -       +      +
     74A  ILE*     4.2     9.4    -      -       +      -
    104A  VAL*     3.9    27.8    -      -       +      -
    106A  TRP*     3.6    40.6    -      -       +      -
    120A  ASN      3.4    12.8    +      -       -      +
    121A  VAL*     3.7     8.3    -      -       -      +
    123A  ILE*     1.3    75.0    -      -       -      +
    125A  GLY*     1.3    61.4    +      -       -      +
    127A  GLU*     3.2     4.3    +      -       -      +
    128A  VAL*     3.0    30.8    +      -       +      +
    157A  ALA*     4.1    15.7    -      -       +      -
----------------------------------------------------------
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Residues in contact with GLY 125 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    121A  VAL      3.0    15.3    +      -       -      -
    124A  VAL*     1.3    75.1    -      -       -      +
    126A  ALA*     1.3    60.5    +      -       -      +
    128A  VAL*     3.3     2.1    +      -       -      -
    129A  ALA*     3.1    20.3    +      -       -      +
    157A  ALA      3.5    23.9    +      -       -      -
    160A  GLU*     3.9    13.0    -      -       -      -
    161A  ALA*     3.5    17.5    -      -       -      +
    164A  ARG*     4.6     0.7    -      -       -      -
----------------------------------------------------------
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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
----------------------------------------------------------
      8A  LEU*     3.8    16.9    -      -       +      +
     11A  PHE*     4.0    14.4    -      -       +      -
    122A  ARG      3.0    19.2    +      -       -      +
    123A  ILE      3.5     4.9    -      -       -      +
    125A  GLY*     1.3    74.9    -      -       -      +
    127A  GLU*     1.3    57.3    +      -       -      +
    129A  ALA*     3.6     2.2    +      -       -      +
    130A  TYR*     2.9    30.1    +      -       -      +
    164A  ARG*     3.7    36.3    +      -       -      +
----------------------------------------------------------
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Residues in contact with GLU 127 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
      7A  ARG*     2.8    33.9    +      -       -      -
      8A  LEU*     3.7    16.7    -      -       +      +
     31A  PRO*     3.8    14.2    -      -       -      +
     36A  THR*     3.8    27.4    +      -       +      +
     38A  PHE*     3.8    24.8    -      -       +      -
     54A  ALA*     5.8     0.2    -      -       -      +
    123A  ILE*     2.9    21.2    +      -       +      +
    124A  VAL      3.2     8.0    +      -       -      +
    126A  ALA*     1.3    77.1    -      -       -      +
    128A  VAL*     1.3    57.1    +      -       -      +
    130A  TYR*     3.4    11.0    +      -       -      +
    131A  LEU*     3.0    22.9    +      -       -      +
----------------------------------------------------------
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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
----------------------------------------------------------
     38A  PHE*     4.1    22.4    -      -       +      -
     72A  PHE*     4.1    25.8    -      -       +      -
     74A  ILE*     4.3    20.0    -      -       +      -
    104A  VAL*     4.5    10.8    -      -       +      -
    124A  VAL      3.0    18.2    +      -       -      +
    125A  GLY*     3.8     4.3    -      -       -      +
    127A  GLU*     1.3    72.0    -      -       -      +
    129A  ALA*     1.4    62.5    +      -       -      +
    131A  LEU*     3.1     4.5    +      -       -      +
    132A  VAL*     2.9    35.8    +      -       +      +
    148A  ILE*     4.2    12.6    -      -       +      -
    161A  ALA*     4.0    14.8    -      -       +      -
----------------------------------------------------------
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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  GLY      3.1    16.1    +      -       -      +
    126A  ALA*     3.7     5.4    -      -       -      +
    128A  VAL*     1.4    75.1    -      -       -      +
    130A  TYR*     1.3    58.5    +      -       -      +
    132A  VAL*     3.3     8.2    +      -       -      +
    133A  GLY*     2.9    27.5    +      -       -      -
    161A  ALA*     4.0    11.1    -      -       -      +
    164A  ARG*     3.7    31.2    -      -       +      +
    165A  THR*     4.3    11.8    -      -       +      +
----------------------------------------------------------
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Residues in contact with TYR 130 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
      7A  ARG*     3.7    57.1    -      -       +      +
      8A  LEU*     4.1    10.1    -      -       +      -
     54A  ALA*     3.8    27.8    +      -       +      -
    126A  ALA      2.9    19.7    +      -       -      +
    127A  GLU*     3.5    10.3    -      -       -      +
    128A  VAL      3.2     0.2    -      -       -      -
    129A  ALA*     1.3    75.9    -      -       -      +
    131A  LEU*     1.4    61.4    +      -       -      +
    133A  GLY*     3.3     3.2    +      -       -      -
    134A  VAL*     3.1    34.1    +      -       +      +
----------------------------------------------------------
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Residues in contact with LEU 131 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     38A  PHE*     4.0    30.1    -      -       +      -
     52A  ILE*     4.6     7.9    -      -       +      -
     53A  VAL      4.4     0.4    -      -       -      +
     54A  ALA*     3.8    33.6    -      -       +      +
     59A  ILE*     3.9    20.6    -      -       +      -
     72A  PHE*     3.9    27.6    -      -       +      -
    102A  ILE*     4.5    11.0    -      -       +      -
    127A  GLU      3.0    14.0    +      -       -      +
    128A  VAL      3.1     6.3    +      -       -      +
    130A  TYR*     1.4    73.6    -      -       -      +
    132A  VAL*     1.3    65.0    +      -       -      +
    134A  VAL*     3.1     6.0    +      -       +      +
    135A  LEU*     3.0    33.9    +      -       +      +
----------------------------------------------------------
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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
----------------------------------------------------------
     72A  PHE*     4.1    26.0    -      -       +      -
    128A  VAL*     2.9    31.3    +      -       +      +
    129A  ALA*     3.7     8.3    -      -       -      +
    131A  LEU*     1.3    69.3    -      -       -      +
    133A  GLY*     1.3    62.8    +      -       -      +
    135A  LEU*     3.3    12.3    +      -       +      +
    136A  GLN*     3.1    23.2    +      -       -      +
    141A  TYR      5.1     0.9    -      -       -      +
    143A  PRO*     4.2    25.7    -      -       +      +
    146A  VAL*     4.4    20.4    -      -       +      -
    148A  ILE*     5.6     1.1    -      -       +      -
    161A  ALA*     6.3     0.2    -      -       +      -
    165A  THR*     4.2    18.6    -      -       +      -
    169A  VAL*     4.6     4.7    -      -       +      -
----------------------------------------------------------
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Residues in contact with GLY 133 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    129A  ALA      2.9    17.0    +      -       -      -
    130A  TYR*     3.6     3.1    -      -       -      -
    132A  VAL*     1.3    76.3    -      -       -      +
    134A  VAL*     1.3    59.9    +      -       -      +
    136A  GLN*     3.2    12.6    +      -       -      +
    137A  SER*     3.0    25.8    +      -       -      -
    165A  THR*     5.9     0.2    -      -       -      +
----------------------------------------------------------
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Residues in contact with VAL 134 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     54A  ALA*     4.0    37.7    -      -       +      +
     55A  ASP      4.3     4.3    -      -       -      +
     56A  PRO*     4.3    14.6    -      -       +      -
     59A  ILE*     5.2     5.2    -      -       +      -
    130A  TYR*     3.1    28.4    +      -       +      +
    131A  LEU*     3.1    11.4    +      -       +      +
    133A  GLY*     1.3    73.3    -      -       -      +
    135A  LEU*     1.3    57.9    +      -       +      +
    137A  SER*     3.1     7.1    +      -       -      +
    138A  SER*     2.8    46.1    +      -       -      +
    139A  PHE*     5.2     0.9    -      -       +      -
----------------------------------------------------------
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Residues in contact with LEU 135 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     59A  ILE*     4.2    19.5    -      -       +      -
     64A  PHE*     3.9    36.3    -      -       +      -
     70A  THR*     5.0     7.4    -      -       +      -
     72A  PHE*     5.1     5.6    -      -       +      -
    102A  ILE*     5.9     1.1    -      -       +      -
    131A  LEU*     3.0    33.1    +      -       +      +
    132A  VAL*     3.6    13.7    -      -       -      +
    134A  VAL*     1.3    74.2    -      -       -      +
    136A  GLN*     1.3    57.0    +      -       -      +
    139A  PHE*     2.8    48.3    +      -       +      +
    141A  TYR*     3.3    36.2    +      -       +      +
    146A  VAL*     5.4     3.8    -      -       +      -
----------------------------------------------------------
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Residues in contact with GLN 136 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    132A  VAL*     3.1    14.0    +      -       -      +
    133A  GLY*     3.2    13.8    +      -       -      +
    135A  LEU*     1.3    76.5    -      -       -      +
    137A  SER*     1.3    64.0    +      -       -      +
    140A  ASP*     3.1    23.8    +      -       -      -
    141A  TYR      3.4    20.4    +      -       -      +
    142A  SER*     5.2     0.6    -      -       -      +
    143A  PRO*     3.7    32.1    -      -       +      +
    168A  ALA*     6.2     0.2    -      -       -      +
----------------------------------------------------------
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Residues in contact with SER 137 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    133A  GLY      3.0    17.3    +      -       -      -
    134A  VAL*     3.1    10.0    +      -       -      +
    136A  GLN*     1.3    77.3    -      -       -      +
    138A  SER*     1.3    64.7    +      -       -      +
    140A  ASP*     4.6     1.2    +      -       -      -
----------------------------------------------------------
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Residues in contact with SER 138 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     56A  PRO*     3.5    32.2    -      -       -      +
    134A  VAL*     2.8    23.9    +      -       -      +
    137A  SER*     1.3    78.8    +      -       -      +
    139A  PHE*     1.3    75.9    +      -       -      +
    140A  ASP      3.5     0.7    -      -       -      -
----------------------------------------------------------
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Residues in contact with PHE 139 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     56A  PRO*     3.5    37.5    -      -       +      -
     59A  ILE*     3.8    31.2    -      -       +      -
     60A  GLN*     3.6    27.4    -      -       +      -
     64A  PHE*     6.4     0.2    -      +       -      -
     66A  THR*     3.8    32.6    -      -       +      +
    134A  VAL*     4.9     1.8    -      -       +      -
    135A  LEU*     2.8    37.8    +      -       +      +
    138A  SER*     1.3    86.0    -      -       -      +
    140A  ASP*     1.4    73.6    +      -       -      +
    141A  TYR*     3.4     5.2    +      -       +      +
----------------------------------------------------------
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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