Contacts of the helix formed by residues 110 - 135 (chain A) in PDB entry 4Z1H


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 GLU 110 (chain A).
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    108A  GLU*     4.0    26.1    -      -       +      +
    109A  LYS*     1.3    78.3    -      -       -      +
    111A  VAL*     1.3    60.6    +      -       -      +
    112A  PHE*     3.3     4.2    +      -       -      -
    113A  ILE*     3.9     7.1    +      -       -      +
    114A  ARG      4.3     0.5    +      -       -      -
    264A  PHE*     3.5    28.7    -      -       +      -
    269A  ARG*     2.5    41.0    +      -       -      +
    273A  VAL*     3.2    27.7    -      -       +      +
    276A  LYS*     3.7    14.5    +      -       -      +
    277A  TYR*     3.2    33.0    +      -       +      +
----------------------------------------------------------
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Residues in contact with VAL 111 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    106A  TYR*     3.7    28.0    -      -       +      -
    108A  GLU*     3.3    28.0    -      -       +      +
    109A  LYS      3.1     0.2    +      -       -      -
    110A  GLU*     1.3    78.5    -      -       -      +
    112A  PHE*     1.3    61.1    +      -       -      +
    113A  ILE      3.3     1.8    -      -       -      -
    114A  ARG*     3.2    48.1    -      -       -      +
    115A  GLU*     2.9    30.7    +      -       -      +
    210A  MET*     4.4     3.6    -      -       +      -
    277A  TYR*     4.1    22.0    -      -       +      +
----------------------------------------------------------
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Residues in contact with PHE 112 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    109A  LYS      3.2    22.1    +      -       -      +
    110A  GLU      4.1     1.6    -      -       -      -
    111A  VAL*     1.3    77.9    -      -       -      +
    113A  ILE*     1.3    92.9    +      -       +      +
    115A  GLU*     3.4     1.0    +      -       -      +
    116A  LEU*     2.9    35.3    +      -       +      +
    154A  ILE*     4.0    22.4    -      -       +      -
    207A  SER*     3.5    39.7    -      -       -      +
    208A  ALA*     4.2     2.5    -      -       -      +
    210A  MET*     5.1     0.6    -      -       +      +
    211A  VAL*     3.8    33.2    -      -       +      -
    255A  ILE*     4.1    17.3    -      -       +      -
    264A  PHE*     3.7    45.8    -      +       +      -
----------------------------------------------------------
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Residues in contact with ILE 113 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    110A  GLU      4.0     5.6    -      -       -      +
    112A  PHE*     1.3   102.5    -      -       +      +
    114A  ARG*     1.3    57.0    +      -       -      +
    116A  LEU*     3.8     5.1    -      -       -      +
    117A  ILE*     2.9    54.8    +      -       +      +
    145A  LEU*     3.9    17.0    -      -       +      -
    154A  ILE*     4.1     9.2    -      -       +      -
    156A  ILE*     4.9     0.6    -      -       +      +
    264A  PHE*     3.9    26.0    -      -       +      -
    270A  VAL*     4.1    20.2    -      -       +      -
    273A  VAL*     3.9    24.0    -      -       +      -
    274A  VAL*     4.1     9.9    -      -       +      +
----------------------------------------------------------
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Residues in contact with ARG 114 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    106A  TYR*     3.5    24.2    -      -       -      -
    110A  GLU      4.3     1.2    +      -       -      +
    111A  VAL*     3.2    44.8    +      -       -      +
    113A  ILE*     1.3    81.4    -      -       -      +
    115A  GLU*     1.3    81.4    +      -       -      +
    117A  ILE*     3.3     3.1    +      -       -      +
    118A  SER*     2.9    29.8    +      -       -      -
    273A  VAL*     5.3     0.8    -      -       -      +
    277A  TYR*     3.8    25.7    -      -       +      -
    278A  SER*     4.4    10.5    -      -       -      -
    370A  VAL*     3.3    27.0    -      -       +      +
    371A  LEU      3.4    28.6    +      -       -      -
    372A  ILE*     4.1    21.2    +      -       -      +
    397A  PRO      5.4     3.8    +      -       -      -
----------------------------------------------------------
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Residues in contact with GLU 115 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    106A  TYR*     3.9    29.4    +      -       +      +
    111A  VAL      2.9    23.5    +      -       -      +
    114A  ARG*     1.3   100.2    +      -       -      +
    116A  LEU*     1.3    61.1    +      -       -      +
    118A  SER*     3.1    13.4    +      -       -      -
    119A  ASN*     2.9    33.1    +      -       -      +
    201A  PHE      6.0     0.2    +      -       -      -
    204A  GLY*     3.9    27.4    -      -       -      +
    207A  SER*     4.0     7.9    -      -       -      +
    370A  VAL*     5.4     2.6    -      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 116 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    112A  PHE*     2.9    35.4    +      -       +      +
    113A  ILE*     3.8     4.5    -      -       -      +
    115A  GLU*     1.3    75.7    -      -       -      +
    117A  ILE*     1.3    63.2    +      -       -      +
    119A  ASN*     3.1    10.4    +      -       +      +
    120A  ALA*     2.9    22.7    +      -       -      +
    156A  ILE*     3.7    32.0    -      -       +      +
    204A  GLY      4.9     0.9    -      -       -      +
    205A  PHE*     4.0    34.5    -      -       +      +
    207A  SER*     5.1     1.6    -      -       -      +
    208A  ALA*     4.9     3.4    -      -       +      -
    253A  ILE*     4.0    23.1    -      -       +      -
    255A  ILE*     3.6    31.4    -      -       +      -
    601A  4KP      5.4     1.0    +      -       -      -
----------------------------------------------------------
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Residues in contact with ILE 117 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    113A  ILE*     2.9    38.9    +      -       +      +
    114A  ARG      3.6     4.7    -      -       -      +
    116A  LEU*     1.3    74.7    -      -       -      +
    118A  SER*     1.3    58.3    +      -       -      +
    120A  ALA*     3.3     4.2    +      -       -      +
    121A  SER*     2.9    27.0    +      -       -      -
    143A  ILE*     4.0     3.9    -      -       +      +
    145A  LEU*     4.3     5.4    -      -       +      -
    156A  ILE*     3.9    19.3    -      -       +      -
    274A  VAL*     4.3    10.5    -      -       +      -
    278A  SER*     3.6    27.6    -      -       -      +
    281A  VAL*     4.0    18.4    -      -       +      -
    285A  LEU*     3.6    35.2    -      -       +      -
----------------------------------------------------------
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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
----------------------------------------------------------
    114A  ARG*     2.9    18.0    +      -       -      +
    115A  GLU*     3.1    19.7    +      -       -      -
    117A  ILE*     1.3    77.3    -      -       -      +
    119A  ASN*     1.3    64.4    +      -       -      +
    121A  SER*     3.1     9.6    +      -       -      -
    122A  ASP*     3.0    29.3    +      -       -      -
    368A  ARG*     5.6     4.2    +      -       -      -
    370A  VAL*     3.9    25.3    -      -       -      +
----------------------------------------------------------
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Residues in contact with ASN 119 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    115A  GLU      2.9    18.9    +      -       -      +
    116A  LEU*     3.5    10.7    -      -       +      +
    118A  SER*     1.3    77.7    -      -       -      +
    120A  ALA*     1.3    58.4    +      -       -      +
    122A  ASP*     3.3     9.3    +      -       -      +
    123A  ALA*     2.9    29.6    +      -       -      +
    201A  PHE*     4.1    18.5    +      -       -      -
    202A  GLY*     3.9     4.1    +      -       -      -
    204A  GLY*     4.3     2.7    +      -       -      -
    205A  PHE*     3.6    29.3    -      -       -      +
    253A  ILE*     6.5     0.4    -      -       +      -
    601A  4KP      3.6    43.2    +      -       +      +
----------------------------------------------------------
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Residues in contact with ALA 120 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    116A  LEU      2.9    13.3    +      -       -      +
    117A  ILE*     3.5     9.0    -      -       -      +
    119A  ASN*     1.3    76.9    -      -       -      +
    121A  SER*     1.3    57.8    +      -       -      +
    123A  ALA*     3.4     2.1    +      -       -      +
    124A  LEU*     2.9    34.1    +      -       -      +
    143A  ILE*     3.9    23.8    -      -       +      -
    156A  ILE*     4.5     4.9    -      -       +      -
    158A  ASP*     3.6    35.8    -      -       +      +
    601A  4KP      4.2     2.1    +      -       -      +
----------------------------------------------------------
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Residues in contact with SER 121 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    117A  ILE      2.9    13.5    +      -       -      -
    118A  SER*     3.1    13.0    +      -       -      -
    120A  ALA*     1.3    77.8    -      -       -      +
    122A  ASP*     1.3    62.2    +      -       -      +
    124A  LEU      3.4     1.0    +      -       -      -
    125A  GLU*     2.9    25.7    +      -       -      +
    143A  ILE*     4.0     3.6    -      -       -      +
    281A  VAL*     4.2    20.7    -      -       -      +
    282A  SER*     4.4     7.8    +      -       -      -
    283A  PHE*     3.4    24.8    -      -       -      -
----------------------------------------------------------
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Residues in contact with ASP 122 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    118A  SER*     3.0    21.4    +      -       -      +
    119A  ASN*     3.9     8.2    -      -       -      +
    121A  SER*     1.3    76.6    +      -       -      +
    123A  ALA*     1.3    61.2    +      -       -      +
    125A  GLU*     3.2     9.1    +      -       -      +
    126A  LYS*     2.9    30.0    +      -       -      +
    201A  PHE*     5.7     5.4    -      -       -      +
    368A  ARG*     2.7    39.3    +      -       -      -
----------------------------------------------------------
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Residues in contact with ALA 123 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    119A  ASN      2.9    18.2    +      -       -      +
    120A  ALA      3.5     4.7    -      -       -      +
    122A  ASP*     1.3    75.9    -      -       -      +
    124A  LEU*     1.3    57.6    +      -       -      +
    126A  LYS*     3.2     1.8    +      -       -      -
    127A  LEU      3.0    24.6    +      -       -      -
    158A  ASP*     3.9     9.2    -      -       -      +
    161A  ILE*     3.2    32.7    +      -       -      +
    601A  4KP      3.5    28.9    -      -       +      +
----------------------------------------------------------
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Residues in contact with LEU 124 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    120A  ALA      2.9    17.2    +      -       -      +
    123A  ALA*     1.3    75.8    -      -       -      +
    125A  GLU*     1.3    58.0    +      -       -      +
    127A  LEU*     3.4     2.4    +      -       -      +
    128A  ARG*     2.9    30.5    +      -       -      +
    141A  MET*     3.5    22.5    -      -       +      +
    142A  GLU      3.8    10.8    -      -       -      +
    143A  ILE*     3.5    32.3    -      -       +      -
    158A  ASP*     4.5     2.5    -      -       +      -
    159A  THR*     3.5    19.1    -      -       -      +
    160A  GLY*     3.4    30.5    -      -       -      +
    283A  PHE*     3.5    37.1    -      -       +      -
----------------------------------------------------------
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Residues in contact with GLU 125 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    121A  SER*     2.9    18.1    +      -       -      +
    122A  ASP*     3.5    11.9    -      -       -      +
    123A  ALA      3.2     0.2    -      -       -      -
    124A  LEU*     1.3    77.5    -      -       -      +
    126A  LYS*     1.3    57.1    +      -       -      +
    128A  ARG*     3.4    11.8    +      -       -      +
    129A  HIS*     2.9    37.4    +      -       +      +
    282A  SER*     5.0     5.9    +      -       -      -
    283A  PHE*     3.5    20.6    -      -       +      -
----------------------------------------------------------
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Residues in contact with LYS 126 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    122A  ASP      2.9    15.7    +      -       -      +
    123A  ALA*     3.2     3.6    +      -       -      +
    125A  GLU*     1.3    75.2    -      -       -      +
    127A  LEU*     1.3    64.8    +      -       -      +
    129A  HIS*     3.7    30.9    -      -       +      +
    130A  LYS*     2.9    36.7    +      -       -      +
    161A  ILE*     4.0    24.4    -      -       +      +
----------------------------------------------------------
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Residues in contact with LEU 127 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    123A  ALA      3.0     5.9    +      -       -      -
    124A  LEU      3.6     6.3    -      -       -      +
    126A  LYS*     1.3    77.4    -      -       -      +
    128A  ARG*     1.3    57.7    +      -       -      +
    130A  LYS*     3.6     6.0    -      -       +      +
    131A  LEU*     2.9    50.8    +      -       +      +
    139A  PRO*     4.1    22.4    -      -       +      -
    141A  MET*     4.4    10.3    -      -       +      -
    159A  THR      3.2    27.1    -      -       -      +
    160A  GLY*     3.8     5.6    -      -       -      +
    161A  ILE*     3.4    24.5    -      -       +      +
    222A  ALA*     3.7    29.8    -      -       +      -
    249A  THR*     5.5     3.1    -      -       +      -
----------------------------------------------------------
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Residues in contact with ARG 128 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    124A  LEU      2.9    17.9    +      -       -      +
    125A  GLU*     3.7    14.7    +      -       -      +
    127A  LEU*     1.3    73.6    -      -       -      +
    129A  HIS*     1.3    66.1    +      -       -      +
    131A  LEU*     3.2     4.8    +      -       -      +
    132A  VAL*     2.9    49.1    +      -       +      +
    138A  LEU*     4.0    18.2    -      -       +      +
    141A  MET*     3.5    34.9    -      -       +      +
    283A  PHE*     4.2    14.6    -      -       -      -
----------------------------------------------------------
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Residues in contact with HIS 129 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    125A  GLU*     2.9    29.2    +      -       +      +
    126A  LYS*     3.7    28.9    -      -       +      +
    128A  ARG*     1.3    73.8    -      -       -      +
    130A  LYS*     1.3    54.9    +      -       -      +
    132A  VAL*     3.9     4.4    -      -       -      +
    133A  SER*     2.6    53.2    +      -       -      -
----------------------------------------------------------
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Residues in contact with LYS 130 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    126A  LYS*     2.9    29.9    +      -       -      +
    127A  LEU*     3.6    10.3    -      -       +      +
    129A  HIS*     1.3    77.3    -      -       -      +
    131A  LEU*     1.3    60.9    +      -       +      +
    133A  SER*     3.2     6.5    +      -       -      -
    134A  ASP*     2.9    48.2    +      -       -      +
    161A  ILE*     4.3    19.6    -      -       +      +
    222A  ALA*     4.2     8.7    +      -       -      +
    223A  ALA*     3.9    31.5    -      -       -      +
    224A  PRO*     4.8     5.5    -      -       -      +
----------------------------------------------------------
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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
----------------------------------------------------------
    127A  LEU*     2.9    45.0    +      -       +      +
    128A  ARG*     4.9     0.7    -      -       -      -
    130A  LYS*     1.3    82.1    -      -       +      +
    132A  VAL*     1.3    59.6    +      -       -      +
    134A  ASP*     3.5     6.4    +      -       -      +
    135A  GLY      2.8     6.2    +      -       -      -
    136A  GLN*     2.8    47.0    +      -       +      +
    137A  ALA      4.0     9.9    -      -       -      +
    138A  LEU*     3.8    16.2    -      -       +      -
    139A  PRO*     3.5    33.9    -      -       +      -
    141A  MET*     5.5     0.2    -      -       -      -
----------------------------------------------------------
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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
----------------------------------------------------------
    128A  ARG*     2.9    44.0    +      -       -      +
    129A  HIS*     4.1     4.0    -      -       -      +
    131A  LEU*     1.3    73.3    -      -       -      +
    133A  SER*     1.3    65.8    +      -       -      +
    135A  GLY*     3.1    14.0    +      -       -      +
    136A  GLN      4.7     2.2    -      -       -      +
    138A  LEU*     3.7    25.8    -      -       +      -
----------------------------------------------------------
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Residues in contact with SER 133 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    129A  HIS*     2.6    45.3    +      -       -      -
    130A  LYS*     3.2     7.6    +      -       -      -
    132A  VAL*     1.3    78.7    -      -       -      +
    134A  ASP*     1.3    65.4    +      -       -      +
    135A  GLY      3.5     0.3    +      -       -      -
----------------------------------------------------------
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Residues in contact with ASP 134 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    130A  LYS*     2.9    38.3    +      -       -      +
    131A  LEU*     3.9     8.6    -      -       -      +
    133A  SER*     1.3    81.1    -      -       -      +
    135A  GLY*     1.3    61.2    +      -       -      +
    136A  GLN*     4.4    11.2    -      -       +      +
----------------------------------------------------------
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Residues in contact with GLY 135 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    131A  LEU      2.8     5.6    +      -       -      -
    132A  VAL*     3.1    14.9    +      -       -      -
    133A  SER      4.6     0.2    -      -       -      -
    134A  ASP*     1.3    80.7    -      -       -      +
    136A  GLN*     1.3    63.6    +      -       -      +
----------------------------------------------------------
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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