Contacts of the helix formed by residues 97 - 123 (chain C) 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 C).
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     95C  ALA      3.9     9.9    -      -       -      +
     96C  TRP*     1.3    72.9    -      -       -      +
     98C  GLU*     1.3    65.6    +      -       -      +
     99C  GLU*     3.7     6.2    +      -       -      +
    100C  ARG*     3.0    27.9    +      -       -      +
    101C  LYS*     3.0    22.5    +      -       -      +
    278C  GLN*     3.5    18.6    +      -       -      +
----------------------------------------------------------
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Residues in contact with GLU 98 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     96C  TRP      3.9     1.2    +      -       -      -
     97C  THR*     1.3    73.7    -      -       -      +
     99C  GLU*     1.3    63.5    +      -       -      +
    101C  LYS*     3.6    16.8    +      -       -      +
    102C  GLY*     3.1    18.4    +      -       -      -
    142C  PHE*     3.4    33.0    -      -       +      -
----------------------------------------------------------
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Residues in contact with GLU 99 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     97C  THR*     3.1     6.4    -      -       -      +
     98C  GLU*     1.3    80.2    -      -       -      +
    100C  ARG*     1.3    58.1    +      -       -      +
    102C  GLY*     3.1     3.1    +      -       -      -
    103C  GLN*     2.9    52.3    +      -       +      +
    141C  LEU*     4.0    14.7    -      -       +      +
----------------------------------------------------------
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Residues in contact with ARG 100 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     96C  TRP*     6.0     0.2    -      -       +      -
     97C  THR*     3.0    26.1    +      -       -      +
     99C  GLU*     1.3    77.2    -      -       -      +
    101C  LYS*     1.3    62.5    +      -       +      +
    103C  GLN*     3.3    26.1    +      -       -      +
    104C  VAL*     3.0    24.1    +      -       -      +
    275C  VAL*     3.0    36.9    +      -       -      +
    276C  LEU*     3.7    27.1    -      -       +      +
    278C  GLN*     3.3    34.1    -      -       -      +
    280C  GLU      3.4    12.5    +      -       -      -
    281C  GLU*     2.6    35.8    +      -       -      -
    282C  GLY      5.1     0.4    -      -       -      +
----------------------------------------------------------
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Residues in contact with LYS 101 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     96C  TRP*     4.0    33.9    +      -       +      +
     97C  THR      3.0    14.9    +      -       -      +
     98C  GLU*     3.8    27.6    -      -       -      +
    100C  ARG*     1.3    76.9    -      -       -      +
    102C  GLY*     1.3    52.3    +      -       -      +
    104C  VAL*     3.1    10.2    -      -       -      +
    105C  TRP*     2.8    38.7    +      -       -      +
    142C  PHE*     4.0     2.7    -      -       +      -
    201C  GLY      4.8     6.9    +      -       -      +
    202C  LEU*     4.0    46.5    +      -       +      +
    276C  LEU*     4.0     2.7    -      -       +      -
----------------------------------------------------------
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Residues in contact with GLY 102 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     98C  GLU      3.1     8.4    +      -       -      -
     99C  GLU      3.1     7.2    +      -       -      -
    101C  LYS*     1.3    73.5    -      -       -      +
    103C  GLN*     1.3    63.4    +      -       -      +
    105C  TRP*     4.0     0.6    -      -       -      +
    106C  THR*     2.6    32.7    +      -       -      -
    141C  LEU*     4.0    12.3    -      -       -      -
    142C  PHE*     3.0    29.5    -      -       -      -
----------------------------------------------------------
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Residues in contact with GLN 103 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     99C  GLU*     2.9    44.0    +      -       -      +
    100C  ARG*     3.6    36.5    +      -       -      +
    102C  GLY*     1.3    75.3    -      -       -      +
    104C  VAL*     1.3    58.9    +      -       -      +
    106C  THR*     3.9     2.1    -      -       -      -
    107C  ALA*     2.9    31.3    +      -       -      +
    141C  LEU*     3.9    17.0    -      -       +      +
    281C  GLU*     5.1     2.8    -      -       -      +
----------------------------------------------------------
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Residues in contact with VAL 104 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    100C  ARG*     3.0    11.2    +      -       -      +
    101C  LYS      3.1    12.8    -      -       -      +
    103C  GLN*     1.3    78.3    -      -       -      +
    105C  TRP*     1.3    66.9    +      -       -      +
    107C  ALA*     3.3     1.9    +      -       -      +
    108C  ILE*     3.0    31.7    +      -       +      +
    202C  LEU*     3.5    12.3    -      -       +      -
    272C  VAL*     4.0    24.7    -      -       +      +
    275C  VAL*     4.5    12.3    -      -       +      -
    276C  LEU*     3.2    34.3    -      -       +      -
    283C  VAL*     3.3    31.4    -      -       +      -
----------------------------------------------------------
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Residues in contact with TRP 105 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    101C  LYS      2.8    24.4    +      -       -      +
    102C  GLY*     4.0     3.1    -      -       -      +
    104C  VAL*     1.3    73.7    -      -       -      +
    106C  THR*     1.3    74.9    +      -       +      +
    108C  ILE*     3.1     9.4    +      -       +      +
    109C  ILE*     2.9    59.6    +      -       +      +
    142C  PHE*     3.6    31.4    -      +       +      -
    143C  ASP*     3.7    20.4    -      -       +      -
    148C  GLU*     3.9    13.2    -      -       -      -
    202C  LEU*     4.0    20.2    -      -       +      -
    203C  LYS*     3.6    38.8    -      -       +      +
    216C  ASP*     3.6    38.1    +      -       +      +
    219C  GLU*     5.7     1.8    +      -       +      +
----------------------------------------------------------
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Residues in contact with THR 106 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    102C  GLY      2.6    22.1    +      -       -      -
    103C  GLN*     3.9     2.7    -      -       -      -
    105C  TRP*     1.3    84.7    -      -       +      +
    107C  ALA*     1.3    65.7    +      -       -      +
    109C  ILE*     3.4     1.9    +      -       -      +
    110C  ALA*     3.0    23.9    +      -       -      +
    139C  LEU*     3.9    29.1    -      -       +      +
    140C  ARG*     3.9    17.3    -      -       -      +
    141C  LEU*     3.6     7.3    -      -       +      -
    142C  PHE      3.1    22.1    +      -       -      +
----------------------------------------------------------
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Residues in contact with ALA 107 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    103C  GLN      2.9    19.2    +      -       -      +
    104C  VAL      3.5     6.5    -      -       -      +
    106C  THR*     1.3    76.2    -      -       -      +
    108C  ILE*     1.3    62.9    +      -       -      +
    110C  ALA*     3.3     8.2    -      -       -      +
    111C  GLN*     3.2    27.0    +      -       -      +
    283C  VAL*     4.2    24.2    -      -       +      -
----------------------------------------------------------
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Residues in contact with ILE 108 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    104C  VAL*     3.0    24.7    +      -       +      +
    105C  TRP*     3.4    13.2    -      -       +      +
    106C  THR      3.1     0.2    -      -       -      -
    107C  ALA*     1.3    75.5    -      -       -      +
    109C  ILE*     1.3    67.6    +      -       +      +
    111C  GLN*     2.9    21.7    +      -       -      +
    112C  LYS*     3.1     9.0    +      -       -      +
    202C  LEU*     4.8     4.9    -      -       +      -
    216C  ASP*     3.6    21.1    -      -       +      +
    217C  LEU*     4.2    26.7    -      -       +      +
    219C  GLU*     4.1     5.6    -      -       +      -
    220C  PRO*     3.7    23.0    -      -       +      +
    268C  TYR*     3.9    15.0    -      -       +      +
    272C  VAL*     4.3    16.6    -      -       +      -
    283C  VAL*     4.5    10.8    -      -       +      -
----------------------------------------------------------
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Residues in contact with ILE 109 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    105C  TRP*     2.9    53.1    +      -       +      +
    106C  THR*     3.9     3.4    -      -       -      +
    108C  ILE*     1.3    78.1    -      -       +      +
    110C  ALA*     1.3    63.4    +      -       -      +
    112C  LYS*     3.0    11.6    +      -       +      +
    113C  ILE*     2.9    40.2    +      -       +      +
    139C  LEU*     4.1    12.8    -      -       +      -
    148C  GLU*     3.1    47.3    -      -       +      +
    219C  GLU*     4.1    23.6    -      -       +      +
----------------------------------------------------------
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Residues in contact with ALA 110 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    106C  THR      3.0    13.2    +      -       -      +
    107C  ALA*     3.3    13.5    -      -       -      +
    109C  ILE*     1.3    77.7    -      -       -      +
    111C  GLN*     1.3    57.6    +      -       +      +
    113C  ILE*     3.2     5.0    +      -       -      +
    114C  THR*     2.8    33.1    +      -       -      -
    136C  ARG*     3.7    23.7    -      -       +      +
    139C  LEU*     4.1    17.0    -      -       +      -
----------------------------------------------------------
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Residues in contact with GLN 111 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    107C  ALA*     3.3    13.4    +      -       -      +
    108C  ILE*     2.9     9.0    +      -       -      +
    110C  ALA*     1.3    77.9    -      -       +      +
    112C  LYS*     1.3    64.0    +      -       -      +
    114C  THR*     3.4     7.8    +      -       -      -
    115C  ASN*     3.0    31.0    +      -       -      +
    220C  PRO*     4.0    10.2    -      -       +      +
    268C  TYR*     3.3    18.2    +      -       -      -
    283C  VAL*     3.3    17.6    -      -       -      +
    284C  PRO      2.8    23.2    +      -       -      -
    285C  GLU*     3.6    22.9    -      -       +      +
    286C  PHE      3.1    28.5    +      -       -      +
----------------------------------------------------------
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Residues in contact with LYS 112 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    108C  ILE      3.1     6.1    +      -       -      +
    109C  ILE*     3.0    16.2    +      -       +      +
    111C  GLN*     1.3    77.1    -      -       -      +
    113C  ILE*     1.3    53.8    +      -       -      +
    115C  ASN*     3.0     5.5    +      -       -      +
    116C  GLN*     2.8    69.8    +      -       +      +
    148C  GLU*     3.4    33.5    +      -       -      +
    152C  ALA*     4.8     8.9    -      -       -      +
    219C  GLU*     3.4    53.8    +      -       +      +
    220C  PRO*     3.9    10.2    -      -       -      +
    222C  ARG*     4.4    11.1    -      -       +      +
    223C  PRO*     4.3     4.6    -      -       +      +
----------------------------------------------------------
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Residues in contact with ILE 113 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    109C  ILE*     2.9    33.3    +      -       +      +
    110C  ALA      3.7     6.5    -      -       -      +
    112C  LYS*     1.3    77.4    -      -       +      +
    114C  THR*     1.3    64.7    +      -       -      +
    116C  GLN*     3.1    14.3    +      -       -      +
    117C  SER*     2.9    22.2    +      -       -      -
    132C  LEU*     3.6    36.5    -      -       +      +
    133C  LEU*     5.3     0.4    -      -       -      -
    135C  MET      5.2     0.2    -      -       -      -
    136C  ARG*     4.0    17.3    -      -       +      +
    139C  LEU*     4.3    16.2    -      -       +      -
    147C  ARG*     4.5     2.7    -      -       +      +
    148C  GLU*     4.1    21.1    -      -       -      +
    151C  ALA*     4.3    20.2    -      -       +      -
----------------------------------------------------------
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Residues in contact with THR 114 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    110C  ALA      2.8    21.7    +      -       -      -
    111C  GLN*     3.5    11.4    -      -       -      -
    113C  ILE*     1.3    77.7    -      -       -      +
    115C  ASN*     1.3    60.2    +      -       -      +
    117C  SER*     2.4    26.6    +      -       -      +
    118C  LEU*     2.8    29.1    +      -       +      +
    133C  LEU*     4.4    12.6    -      -       +      -
    136C  ARG*     3.3    26.5    +      -       -      +
----------------------------------------------------------
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Residues in contact with ASN 115 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    111C  GLN      3.0    17.5    +      -       -      +
    112C  LYS      3.0     5.8    +      -       -      +
    114C  THR*     1.3    77.0    -      -       -      +
    116C  GLN*     1.3    67.3    +      -       -      +
    118C  LEU*     3.9     9.4    -      -       -      +
    119C  HIS*     3.0    20.8    +      -       -      +
    220C  PRO*     3.0    24.0    +      -       -      +
    223C  PRO*     3.7    11.6    -      -       +      +
    286C  PHE*     3.1    26.1    +      -       -      +
    287C  GLY*     3.2    23.8    -      -       -      -
    288C  ILE*     3.4    30.9    +      -       +      +
----------------------------------------------------------
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Residues in contact with GLN 116 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    112C  LYS*     2.8    49.0    +      -       +      +
    113C  ILE*     3.4    15.7    -      -       -      +
    115C  ASN*     1.3    77.8    -      -       -      +
    117C  SER*     1.3    61.8    +      -       -      +
    119C  HIS      3.3     1.6    +      -       -      -
    120C  LEU*     3.0    19.8    +      -       -      +
    132C  LEU*     3.7     5.4    -      -       +      -
    148C  GLU      4.7     0.6    +      -       -      -
    151C  ALA*     4.2    11.5    +      -       -      +
    152C  ALA*     4.0    25.2    -      -       -      +
    155C  TYR*     3.3    56.4    -      -       +      -
    156C  PHE*     4.9     3.5    -      -       -      -
    222C  ARG*     6.1     1.4    -      -       -      +
    223C  PRO*     4.0     8.8    -      -       +      +
    226C  ASP*     4.6     2.6    -      -       -      +
----------------------------------------------------------
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Residues in contact with SER 117 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    113C  ILE      2.9    11.7    +      -       -      -
    114C  THR*     2.4    27.0    +      -       -      +
    116C  GLN*     1.3    76.7    -      -       -      +
    118C  LEU*     1.3    57.4    +      -       -      +
    120C  LEU*     2.8    26.7    +      -       -      +
    121C  ALA*     2.8    12.9    +      -       -      +
    129C  ALA*     3.4    31.7    -      -       -      +
    132C  LEU*     3.8    15.4    -      -       -      +
    133C  LEU*     3.4    21.4    -      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 118 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    114C  THR*     2.8    30.5    +      -       +      +
    115C  ASN*     3.8    25.8    -      -       -      +
    117C  SER*     1.3    74.9    +      -       -      +
    119C  HIS*     1.3    58.0    +      -       -      +
    121C  ALA*     3.4    11.7    -      -       +      +
    122C  GLN*     2.9    28.8    +      -       -      +
    287C  GLY*     5.1     1.8    -      -       -      -
    288C  ILE*     4.1    30.7    -      -       +      +
----------------------------------------------------------
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Residues in contact with HIS 119 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    115C  ASN      3.0    14.5    +      -       -      +
    116C  GLN      3.4     8.7    -      -       -      +
    117C  SER      3.1     0.2    -      -       -      -
    118C  LEU*     1.3    75.4    -      -       -      +
    120C  LEU*     1.3    65.0    +      -       -      +
    122C  GLN*     3.2    22.0    -      -       -      +
    123C  ARG*     3.2    41.5    +      -       -      +
    155C  TYR*     2.8    28.6    +      -       -      +
    159C  LEU*     3.7    21.9    -      -       +      +
    223C  PRO*     4.7     5.8    +      -       +      -
    226C  ASP*     3.8     7.4    -      -       -      +
    227C  GLN*     3.5    39.8    -      -       +      +
    230C  TYR*     4.3     4.4    -      -       +      +
    288C  ILE*     4.8     4.9    -      -       +      +
----------------------------------------------------------
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Residues in contact with LEU 120 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    116C  GLN      3.0    12.1    +      -       -      +
    117C  SER      2.8    11.0    +      -       -      +
    119C  HIS*     1.3    69.3    -      -       -      +
    121C  ALA*     1.3    66.8    +      -       -      +
    123C  ARG*     2.9    14.2    +      -       -      +
    125C  TYR*     3.1    27.7    +      -       +      +
    128C  LYS*     4.1    18.6    -      -       +      +
    129C  ALA*     4.1     8.5    -      -       +      +
    132C  LEU*     3.7    39.5    -      -       +      -
    155C  TYR*     3.8    16.2    -      -       +      +
    158C  THR*     3.8    29.6    -      -       +      +
    159C  LEU*     3.8    27.1    -      -       +      -
----------------------------------------------------------
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Residues in contact with ALA 121 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    117C  SER      2.8    11.2    +      -       -      +
    118C  LEU*     3.4    18.2    -      -       +      +
    120C  LEU*     1.3    76.9    -      -       -      +
    122C  GLN*     1.3    57.2    +      -       -      +
    124C  ASP*     2.8    26.2    +      -       -      +
    125C  TYR      4.5     5.8    -      -       -      +
    126C  GLY*     4.7     5.5    +      -       -      +
    129C  ALA*     3.9    14.9    -      -       +      +
----------------------------------------------------------
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Residues in contact with GLN 122 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    118C  LEU      2.9    14.8    +      -       -      +
    119C  HIS*     3.2    14.5    -      -       +      +
    121C  ALA*     1.3    76.1    -      -       -      +
    123C  ARG*     1.3    96.6    +      -       -      +
    124C  ASP*     3.4     8.0    +      -       -      +
    227C  GLN*     3.0    28.8    +      -       -      +
    231C  GLU*     4.5     2.4    -      -       -      +
    288C  ILE*     4.5     7.7    +      -       -      +
----------------------------------------------------------
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Residues in contact with ARG 123 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    119C  HIS*     3.2    34.8    +      -       -      +
    120C  LEU      2.9     7.9    +      -       -      +
    122C  GLN*     1.3   102.2    +      -       -      +
    124C  ASP*     1.3    70.3    +      -       -      +
    125C  TYR*     3.3    27.7    +      -       +      -
    159C  LEU*     4.2    11.9    -      -       +      -
    227C  GLN*     3.5    11.9    +      -       -      +
    230C  TYR*     3.2    36.4    -      -       +      +
    231C  GLU*     3.1    39.8    +      -       -      +
----------------------------------------------------------
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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