Contacts of the helix formed by residues 97 - 123 (chain A) in PDB entry 5XVO


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 THR 97 (chain A).
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     95A  ALA      3.9     9.6    -      -       -      +
     96A  TRP*     1.3    73.4    -      -       -      +
     98A  GLU*     1.3    67.4    +      -       -      +
     99A  GLU*     3.8     6.5    +      -       -      +
    100A  ARG*     3.0    28.5    +      -       -      +
    101A  LYS*     3.0    22.7    +      -       -      +
    276A  LEU      5.4     0.2    +      -       -      -
    278A  GLN*     3.5    19.6    +      -       -      +
----------------------------------------------------------
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Residues in contact with GLU 98 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     96A  TRP      3.9     1.2    +      -       -      -
     97A  THR*     1.3    74.1    -      -       -      +
     99A  GLU*     1.3    61.7    +      -       -      +
    101A  LYS*     3.6    20.7    +      -       +      +
    102A  GLY      3.1    16.5    +      -       -      -
    142A  PHE*     3.6    29.8    -      -       +      -
    202A  LEU      4.9     2.6    -      -       -      +
    203A  LYS      5.3     3.8    -      -       -      +
----------------------------------------------------------
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Residues in contact with GLU 99 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     97A  THR*     3.2     6.6    +      -       -      +
     98A  GLU*     1.3    78.8    -      -       -      +
    100A  ARG*     1.3    64.4    +      -       -      +
    102A  GLY*     3.0     3.6    +      -       -      -
    103A  GLN*     2.9    47.3    +      -       +      +
    141A  LEU*     4.1    13.0    -      -       +      +
    142A  PHE*     5.7     0.2    -      -       -      -
----------------------------------------------------------
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Residues in contact with ARG 100 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     97A  THR*     3.0    25.0    +      -       -      +
     99A  GLU*     1.3    76.7    -      -       -      +
    101A  LYS*     1.3    63.9    +      -       -      +
    103A  GLN*     3.3    22.9    +      -       -      +
    104A  VAL*     3.0    31.9    +      -       -      +
    275A  VAL*     3.1    37.4    +      -       -      +
    276A  LEU*     3.7    28.9    -      -       +      +
    278A  GLN*     3.4    32.6    +      -       -      +
    280A  GLU      3.5     9.5    +      -       -      -
    281A  GLU*     3.1    34.2    +      -       -      +
    282A  GLY      5.2     0.2    -      -       -      +
----------------------------------------------------------
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Residues in contact with LYS 101 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     96A  TRP*     4.0    33.9    +      -       +      +
     97A  THR      3.0    23.9    +      -       -      +
     98A  GLU*     3.8    21.7    +      -       -      +
    100A  ARG*     1.3    76.3    -      -       -      +
    102A  GLY*     1.3    53.9    +      -       -      +
    104A  VAL*     3.4     0.9    +      -       -      +
    105A  TRP*     2.7    37.8    +      -       -      +
    142A  PHE*     3.9     2.9    -      -       +      -
    200A  LEU*     6.4     0.2    -      -       -      +
    201A  GLY      4.0     9.2    +      -       -      -
    202A  LEU*     3.3    51.7    +      -       +      +
    205A  ALA*     5.0     7.7    -      -       -      +
    276A  LEU*     4.0    10.3    -      -       +      -
----------------------------------------------------------
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Residues in contact with GLY 102 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     98A  GLU      3.1     7.7    +      -       -      -
     99A  GLU      3.0     6.9    +      -       -      -
    101A  LYS*     1.3    74.3    -      -       -      +
    103A  GLN*     1.3    64.0    +      -       -      +
    106A  THR*     2.6    33.4    +      -       -      -
    141A  LEU*     4.0    10.1    -      -       -      -
    142A  PHE*     3.2    33.1    -      -       -      -
----------------------------------------------------------
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Residues in contact with GLN 103 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     99A  GLU*     2.9    45.3    +      -       -      +
    100A  ARG*     3.6    33.2    +      -       -      +
    102A  GLY*     1.3    75.1    -      -       -      +
    104A  VAL*     1.3    58.6    +      -       +      +
    106A  THR*     3.9     2.5    -      -       -      -
    107A  ALA*     2.9    31.9    +      -       -      +
    141A  LEU*     4.0    17.2    -      -       +      +
----------------------------------------------------------
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Residues in contact with VAL 104 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    100A  ARG*     3.0    22.3    +      -       -      +
    101A  LYS      3.9     2.5    -      -       -      +
    103A  GLN*     1.3    79.7    -      -       +      +
    105A  TRP*     1.3    65.0    +      -       -      +
    107A  ALA*     3.3     2.1    +      -       -      +
    108A  ILE*     3.0    42.4    +      -       +      +
    202A  LEU*     4.0     9.9    -      -       +      -
    272A  VAL*     3.9    18.8    -      -       +      -
    275A  VAL*     3.6    30.1    -      -       +      -
    276A  LEU*     3.9    19.5    -      -       +      -
    283A  VAL*     4.0    14.8    -      -       +      -
----------------------------------------------------------
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Residues in contact with TRP 105 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    101A  LYS      2.7    23.0    +      -       -      +
    102A  GLY      4.0     1.8    -      -       -      +
    104A  VAL*     1.3    74.0    -      -       -      +
    106A  THR*     1.3    69.6    +      -       +      +
    108A  ILE*     3.2     9.1    +      -       +      +
    109A  ILE*     2.9    45.6    +      -       +      +
    142A  PHE*     3.6    33.0    -      +       +      -
    143A  ASP*     3.7    20.6    -      -       +      -
    148A  GLU*     4.0    22.2    -      -       -      -
    202A  LEU*     4.0    23.7    -      -       +      +
    203A  LYS*     3.6    39.1    -      -       +      +
    216A  ASP*     3.5    38.2    +      -       +      +
    219A  GLU*     5.9     4.2    -      -       +      +
----------------------------------------------------------
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Residues in contact with THR 106 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    102A  GLY      2.6    22.7    +      -       -      -
    103A  GLN*     3.9     3.8    -      -       -      -
    105A  TRP*     1.3    84.3    -      -       +      +
    107A  ALA*     1.3    65.7    +      -       -      +
    109A  ILE*     3.1    12.3    -      -       +      +
    110A  ALA*     3.0    23.9    +      -       -      +
    139A  LEU*     4.5    17.3    -      -       +      -
    140A  ARG      3.9    22.4    -      -       -      +
    141A  LEU*     3.6     7.4    -      -       +      -
    142A  PHE      3.1    21.7    +      -       -      +
----------------------------------------------------------
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Residues in contact with ALA 107 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    103A  GLN      2.9    19.1    +      -       -      +
    104A  VAL      3.5     6.1    -      -       -      +
    106A  THR*     1.3    75.4    -      -       -      +
    108A  ILE*     1.3    62.8    +      -       -      +
    110A  ALA*     3.3     8.6    -      -       -      +
    111A  GLN*     3.2    27.2    +      -       -      +
    283A  VAL*     4.2    24.5    -      -       +      -
----------------------------------------------------------
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Residues in contact with ILE 108 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    104A  VAL*     3.0    36.8    +      -       +      +
    105A  TRP*     3.4     9.9    -      -       +      +
    107A  ALA*     1.3    74.9    -      -       -      +
    109A  ILE*     1.3    66.9    +      -       -      +
    111A  GLN*     2.9    20.6    +      -       -      +
    112A  LYS*     3.1     8.7    +      -       -      +
    202A  LEU*     4.7     6.1    -      -       +      -
    216A  ASP*     3.5    22.4    -      -       +      +
    217A  LEU*     4.1    26.2    -      -       +      +
    219A  GLU*     4.1     4.9    -      -       +      -
    220A  PRO*     3.7    22.6    -      -       +      +
    268A  TYR*     3.9    13.7    -      -       -      +
    272A  VAL*     4.3     7.9    -      -       +      -
    283A  VAL*     4.5     9.9    -      -       +      -
----------------------------------------------------------
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Residues in contact with ILE 109 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    105A  TRP*     2.9    31.7    +      -       +      +
    106A  THR*     3.1    24.2    -      -       -      +
    108A  ILE*     1.3    79.0    -      -       -      +
    110A  ALA*     1.3    65.8    +      -       -      +
    112A  LYS*     3.0    25.2    +      -       +      +
    113A  ILE*     2.9    28.2    +      -       +      +
    139A  LEU*     4.0    20.6    -      -       +      -
    143A  ASP*     5.5     0.2    -      -       +      -
    148A  GLU*     3.4    48.5    -      -       +      +
    219A  GLU*     3.9     9.6    -      -       +      +
----------------------------------------------------------
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Residues in contact with ALA 110 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    106A  THR      3.0    13.9    +      -       -      +
    107A  ALA*     3.3    13.5    -      -       -      +
    109A  ILE*     1.3    77.2    -      -       -      +
    111A  GLN*     1.3    57.3    +      -       +      +
    113A  ILE*     3.2     2.9    +      -       -      -
    114A  THR*     2.8    33.1    +      -       -      +
    136A  ARG*     3.6    21.0    -      -       +      +
    139A  LEU*     3.9    21.1    -      -       +      -
----------------------------------------------------------
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Residues in contact with GLN 111 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    107A  ALA*     3.2    13.5    +      -       -      +
    108A  ILE*     2.9     9.4    +      -       -      +
    110A  ALA*     1.3    76.6    -      -       +      +
    112A  LYS*     1.3    61.6    +      -       -      +
    114A  THR*     2.5    22.6    +      -       -      +
    115A  ASN*     3.0    19.1    +      -       -      -
    220A  PRO*     4.0     9.7    -      -       +      +
    268A  TYR*     3.3    17.9    +      -       -      -
    283A  VAL*     3.3    18.2    -      -       -      +
    284A  PRO      2.8    22.6    +      -       -      -
    285A  GLU*     3.5    21.3    -      -       +      +
    286A  PHE      3.1    27.9    +      -       -      +
----------------------------------------------------------
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Residues in contact with LYS 112 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    108A  ILE      3.1     6.1    +      -       -      +
    109A  ILE*     3.0    22.9    +      -       +      +
    111A  GLN*     1.3    74.9    -      -       -      +
    113A  ILE*     1.3    53.6    +      -       -      +
    115A  ASN*     3.0     5.8    +      -       -      +
    116A  GLN*     2.7    70.3    +      -       +      +
    148A  GLU*     3.4    25.6    +      -       -      +
    152A  ALA*     4.7     8.9    -      -       -      +
    219A  GLU*     3.0    53.9    +      -       +      +
    220A  PRO*     3.9    10.0    -      -       -      +
    222A  ARG*     4.3    14.2    -      -       +      +
    223A  PRO*     4.3     4.4    -      -       +      +
----------------------------------------------------------
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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
----------------------------------------------------------
    109A  ILE*     2.9    25.5    +      -       +      +
    110A  ALA      3.7     6.3    -      -       -      +
    112A  LYS*     1.3    77.4    -      -       +      +
    114A  THR*     1.3    63.7    +      -       -      +
    116A  GLN*     3.1    18.8    +      -       -      +
    117A  SER*     2.9    21.8    +      -       -      -
    132A  LEU*     3.6    34.9    -      -       +      +
    133A  LEU*     5.4     0.2    -      -       -      -
    135A  MET      5.2     0.2    -      -       -      -
    136A  ARG*     4.0    14.1    -      -       +      +
    139A  LEU*     4.2    24.7    -      -       +      -
    147A  ARG*     4.5     2.2    -      -       +      +
    148A  GLU*     4.1    25.1    -      -       -      +
    151A  ALA*     4.3    15.9    -      -       +      -
----------------------------------------------------------
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Residues in contact with THR 114 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    110A  ALA      2.8    11.2    +      -       -      +
    111A  GLN*     2.5    31.1    +      -       -      -
    113A  ILE*     1.3    73.0    -      -       -      +
    115A  ASN*     1.3    62.2    +      -       -      +
    117A  SER*     2.4    25.8    +      -       -      -
    118A  LEU*     2.8    22.4    +      -       -      +
    133A  LEU*     4.7     6.5    -      -       +      -
    136A  ARG*     3.2    46.0    -      -       -      +
    286A  PHE      5.4     0.3    +      -       -      -
----------------------------------------------------------
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Residues in contact with ASN 115 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    111A  GLN      3.0    20.1    +      -       -      +
    112A  LYS      3.0     4.0    +      -       -      +
    114A  THR*     1.3    77.3    +      -       -      +
    116A  GLN*     1.3    67.1    +      -       -      +
    118A  LEU*     3.9     8.3    -      -       -      +
    119A  HIS*     3.0    19.4    +      -       -      +
    220A  PRO*     3.0    23.6    +      -       -      +
    223A  PRO*     3.7    17.8    -      -       +      +
    286A  PHE*     3.0    25.7    +      -       -      +
    287A  GLY*     3.2    20.4    -      -       -      -
    288A  ILE*     3.3    30.0    +      -       +      +
----------------------------------------------------------
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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
----------------------------------------------------------
    112A  LYS*     2.7    52.1    +      -       +      +
    113A  ILE*     3.4    21.3    -      -       -      +
    115A  ASN*     1.3    76.9    -      -       -      +
    117A  SER*     1.3    62.2    +      -       -      +
    119A  HIS      3.3     1.6    +      -       -      -
    120A  LEU*     3.0    18.0    +      -       -      +
    132A  LEU*     3.7     5.8    -      -       +      -
    148A  GLU      4.8     0.2    -      -       -      +
    151A  ALA*     4.3    13.3    -      -       -      +
    152A  ALA*     4.2    13.0    +      -       -      +
    155A  TYR*     3.2    62.8    -      -       +      -
    156A  PHE*     4.9     4.0    -      -       -      -
    222A  ARG*     6.3     1.4    -      -       -      +
    223A  PRO*     3.9     9.1    -      -       +      +
    226A  ASP*     4.9     2.4    +      -       -      -
----------------------------------------------------------
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Residues in contact with SER 117 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    113A  ILE      2.9    11.9    +      -       -      -
    114A  THR*     2.4    27.5    +      -       -      -
    116A  GLN*     1.3    75.6    -      -       -      +
    118A  LEU*     1.3    57.7    +      -       -      +
    120A  LEU*     2.8    26.6    +      -       -      +
    121A  ALA*     2.8    13.1    +      -       -      -
    129A  ALA*     3.4    19.1    -      -       -      +
    132A  LEU*     3.8    14.1    -      -       -      +
    133A  LEU*     2.9    37.1    -      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 118 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    114A  THR*     2.8    25.4    +      -       -      +
    115A  ASN*     3.8    23.8    -      -       -      +
    116A  GLN      3.4     0.2    -      -       -      -
    117A  SER*     1.3    73.4    +      -       -      +
    119A  HIS*     1.3    58.2    +      -       -      +
    121A  ALA*     3.4    11.1    +      -       +      +
    122A  GLN*     2.9    28.2    +      -       -      +
    287A  GLY*     5.1     2.9    -      -       -      -
    288A  ILE*     4.1    25.6    -      -       +      +
     68N  GLN*     5.7     0.5    -      -       -      -
----------------------------------------------------------
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Residues in contact with HIS 119 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    115A  ASN      3.0    18.3    +      -       -      +
    116A  GLN      3.4     5.2    -      -       -      +
    117A  SER      3.1     0.2    -      -       -      -
    118A  LEU*     1.3    73.9    -      -       -      +
    120A  LEU*     1.3    66.0    +      -       -      +
    122A  GLN*     3.2    19.6    -      -       -      +
    123A  ARG*     3.2    44.0    +      -       +      +
    155A  TYR*     2.8    29.0    +      -       -      +
    159A  LEU*     3.7    21.0    -      -       +      +
    223A  PRO*     4.7     2.2    +      -       +      -
    226A  ASP*     3.8     5.9    -      -       -      +
    227A  GLN*     3.5    37.4    -      -       +      -
    230A  TYR*     4.2     4.5    -      -       +      +
    288A  ILE*     3.9    10.9    -      -       +      +
----------------------------------------------------------
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Residues in contact with LEU 120 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    116A  GLN      3.0    11.9    +      -       -      +
    117A  SER*     2.8     9.1    +      -       -      +
    119A  HIS*     1.3    73.9    -      -       -      +
    121A  ALA*     1.3    64.6    +      -       -      +
    123A  ARG*     2.9    14.6    +      -       -      +
    124A  ASP      3.4     0.2    +      -       -      -
    125A  TYR*     3.1    36.7    +      -       +      +
    128A  LYS*     4.1    15.3    -      -       +      +
    129A  ALA*     4.1     8.7    -      -       +      +
    132A  LEU*     3.7    39.0    -      -       +      -
    155A  TYR*     3.8    12.3    -      -       +      +
    158A  THR*     3.5    25.6    -      -       -      +
    159A  LEU*     3.8    29.6    -      -       +      -
----------------------------------------------------------
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Residues in contact with ALA 121 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    117A  SER      2.8    15.0    +      -       -      +
    118A  LEU*     3.5    17.5    -      -       +      +
    120A  LEU*     1.3    69.9    -      -       -      +
    122A  GLN*     1.3    58.8    +      -       -      +
    124A  ASP*     2.8    23.0    +      -       -      -
    125A  TYR      4.5     6.3    -      -       -      +
    126A  GLY*     4.8     4.8    +      -       -      +
    129A  ALA*     3.9    15.3    -      -       +      +
     68N  GLN*     3.3    23.7    -      -       +      +
----------------------------------------------------------
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Residues in contact with GLN 122 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    118A  LEU      2.9    14.6    +      -       -      +
    119A  HIS*     3.2    15.1    -      -       -      +
    121A  ALA*     1.3    75.8    -      -       -      +
    123A  ARG*     1.3    96.4    +      -       -      +
    124A  ASP*     3.3     5.8    +      -       -      +
    227A  GLN*     3.0    28.7    +      -       -      +
    231A  GLU*     4.5     2.6    -      -       -      +
    288A  ILE*     5.1     6.7    +      -       -      +
     89M  HIS*     4.5     7.5    +      -       +      -
     68N  GLN*     3.7    30.6    +      -       -      +
----------------------------------------------------------
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Residues in contact with ARG 123 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    119A  HIS*     3.2    38.8    +      -       -      +
    120A  LEU      2.9     8.5    +      -       -      +
    122A  GLN*     1.3   101.9    +      -       -      +
    124A  ASP*     1.3    69.9    +      -       -      +
    125A  TYR*     3.3    28.8    +      -       +      -
    159A  LEU*     4.2    10.1    -      -       +      -
    227A  GLN*     3.5    11.5    +      -       -      +
    230A  TYR*     3.7    33.0    -      -       +      +
    231A  GLU*     3.1    40.4    +      -       -      +
----------------------------------------------------------
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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