Contacts of the helix formed by residues 97 - 123 (chain K) 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 K).
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     95K  ALA      3.9     9.9    -      -       -      +
     96K  TRP*     1.3    73.2    -      -       -      +
     98K  GLU*     1.3    66.6    +      -       -      +
     99K  GLU*     3.7     6.7    +      -       -      +
    100K  ARG*     3.0    27.9    +      -       -      +
    101K  LYS*     3.0    22.5    +      -       -      +
    278K  GLN*     3.5    19.1    +      -       -      +
----------------------------------------------------------
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Residues in contact with GLU 98 (chain K). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     96K  TRP      3.9     1.4    +      -       -      -
     97K  THR*     1.3    73.3    -      -       -      +
     99K  GLU*     1.3    62.3    +      -       -      +
    101K  LYS*     3.4    31.6    +      -       -      +
    102K  GLY      3.1    16.1    +      -       -      -
    142K  PHE*     3.6    25.0    -      -       +      -
    202K  LEU      4.9     1.4    -      -       -      +
----------------------------------------------------------
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Residues in contact with GLU 99 (chain K). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     97K  THR*     3.1     6.8    +      -       -      +
     98K  GLU*     1.3    80.4    -      -       -      +
    100K  ARG*     1.3    58.5    +      -       -      +
    102K  GLY*     3.0     4.2    +      -       -      -
    103K  GLN*     2.9    51.7    +      -       +      +
    141K  LEU*     4.1    13.2    -      -       +      +
----------------------------------------------------------
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Residues in contact with ARG 100 (chain K). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     96K  TRP      5.5     0.2    -      -       -      -
     97K  THR*     3.0    26.3    +      -       -      +
     99K  GLU*     1.3    77.5    -      -       -      +
    101K  LYS*     1.3    64.0    +      -       +      +
    103K  GLN*     3.3    23.0    +      -       -      +
    104K  VAL*     3.0    32.3    +      -       -      +
    275K  VAL*     3.1    37.8    +      -       -      +
    276K  LEU*     3.7    28.7    -      -       +      +
    278K  GLN*     3.4    32.7    +      -       -      +
    280K  GLU      3.5     6.3    +      -       -      -
    281K  GLU*     3.0    37.4    +      -       -      +
    282K  GLY      5.2     0.6    -      -       -      +
----------------------------------------------------------
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Residues in contact with LYS 101 (chain K). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     96K  TRP*     4.0    34.1    +      -       +      +
     97K  THR      3.0    16.3    +      -       -      +
     98K  GLU*     3.4    37.4    +      -       -      +
    100K  ARG*     1.3    76.8    -      -       -      +
    102K  GLY*     1.3    52.5    +      -       -      +
    104K  VAL*     3.9     0.5    -      -       -      +
    105K  TRP*     2.8    37.8    +      -       -      +
    142K  PHE*     3.9     2.9    -      -       +      -
    201K  GLY      4.8     6.3    +      -       -      +
    202K  LEU*     4.0    46.1    +      -       +      +
    276K  LEU*     4.0    10.1    -      -       +      -
----------------------------------------------------------
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Residues in contact with GLY 102 (chain K). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     98K  GLU      3.1     7.5    +      -       -      -
     99K  GLU      3.0     8.4    +      -       -      -
    101K  LYS*     1.3    74.5    -      -       -      +
    103K  GLN*     1.3    65.0    +      -       -      +
    106K  THR*     2.6    33.1    +      -       -      -
    141K  LEU*     4.0    10.1    -      -       -      -
    142K  PHE*     3.2    33.3    -      -       -      -
----------------------------------------------------------
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Residues in contact with GLN 103 (chain K). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     99K  GLU*     2.9    45.4    +      -       -      +
    100K  ARG*     3.3    33.2    +      -       -      +
    102K  GLY*     1.3    76.1    -      -       -      +
    104K  VAL*     1.3    60.2    +      -       +      +
    106K  THR*     3.9     1.8    -      -       -      -
    107K  ALA*     2.9    31.6    +      -       -      +
    141K  LEU*     3.9    17.4    -      -       +      +
----------------------------------------------------------
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Residues in contact with VAL 104 (chain K). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    100K  ARG*     3.0    23.0    +      -       -      +
    101K  LYS      3.9     2.2    -      -       -      +
    103K  GLN*     1.3    80.3    -      -       +      +
    105K  TRP*     1.3    63.8    +      -       -      +
    107K  ALA*     3.4     2.4    +      -       -      +
    108K  ILE*     3.0    46.0    +      -       +      +
    202K  LEU*     4.0     9.2    -      -       +      -
    272K  VAL*     4.0    19.1    -      -       +      -
    275K  VAL*     3.6    30.3    -      -       +      -
    276K  LEU*     3.9    17.9    -      -       +      -
    283K  VAL*     4.0    16.6    -      -       +      -
----------------------------------------------------------
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Residues in contact with TRP 105 (chain K). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    101K  LYS      2.8    23.0    +      -       -      +
    102K  GLY      4.0     1.6    -      -       -      +
    104K  VAL*     1.3    73.6    -      -       -      +
    106K  THR*     1.3    70.3    +      -       -      +
    108K  ILE*     3.2     8.1    +      -       +      +
    109K  ILE*     2.9    60.1    +      -       +      +
    142K  PHE*     3.6    33.2    -      +       +      -
    143K  ASP*     3.7    21.1    -      -       +      -
    148K  GLU*     3.9    15.0    -      -       -      -
    202K  LEU*     4.0    22.8    -      -       +      +
    203K  LYS*     3.6    38.5    -      -       +      +
    216K  ASP*     3.6    37.2    +      -       +      +
    219K  GLU*     5.8     3.3    +      -       +      +
----------------------------------------------------------
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Residues in contact with THR 106 (chain K). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    102K  GLY      2.6    23.6    +      -       -      -
    103K  GLN*     3.9     2.9    -      -       -      -
    105K  TRP*     1.3    83.8    -      -       +      +
    107K  ALA*     1.3    64.9    +      -       -      +
    109K  ILE*     3.4     5.9    +      -       +      +
    110K  ALA*     3.0    23.7    +      -       -      +
    139K  LEU*     4.6    21.3    -      -       +      -
    140K  ARG      3.9    23.1    -      -       -      +
    141K  LEU*     3.6     7.3    -      -       +      -
    142K  PHE      3.1    21.9    +      -       -      +
----------------------------------------------------------
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Residues in contact with ALA 107 (chain K). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    103K  GLN      2.9    19.0    +      -       -      +
    104K  VAL*     3.4     6.7    -      -       -      +
    106K  THR*     1.3    75.5    -      -       -      +
    108K  ILE*     1.3    62.3    +      -       -      +
    110K  ALA*     3.3     8.6    -      -       -      +
    111K  GLN*     3.2    27.0    +      -       -      +
    283K  VAL*     4.2    24.0    -      -       +      -
----------------------------------------------------------
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Residues in contact with ILE 108 (chain K). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    104K  VAL*     3.0    32.1    +      -       +      +
    105K  TRP*     3.4    10.1    -      -       +      +
    106K  THR      3.2     0.2    -      -       -      -
    107K  ALA*     1.3    78.3    -      -       -      +
    109K  ILE*     1.3    69.6    +      -       +      +
    111K  GLN*     3.0    21.4    +      -       -      +
    112K  LYS*     3.1     8.7    +      -       -      +
    202K  LEU*     4.8     5.8    -      -       +      -
    216K  ASP*     3.5    22.4    -      -       +      +
    217K  LEU*     4.2    26.2    -      -       +      +
    219K  GLU*     4.1     5.2    -      -       +      -
    220K  PRO*     3.7    22.8    -      -       +      +
    268K  TYR*     3.9    13.9    -      -       -      +
    272K  VAL*     4.3     8.1    -      -       +      -
    283K  VAL*     4.5    10.3    -      -       +      -
----------------------------------------------------------
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Residues in contact with ILE 109 (chain K). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    105K  TRP*     2.9    68.9    +      -       +      +
    106K  THR*     3.5    10.8    -      -       -      +
    108K  ILE*     1.3    78.1    -      -       +      +
    110K  ALA*     1.3    64.8    +      -       -      +
    112K  LYS*     3.0    11.6    +      -       +      +
    113K  ILE*     2.9    28.2    +      -       +      +
    139K  LEU*     3.5    31.6    -      -       +      -
    143K  ASP*     4.3     1.3    -      -       +      -
    148K  GLU*     4.0    32.1    -      -       +      +
    219K  GLU*     4.8    13.9    -      -       +      -
----------------------------------------------------------
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Residues in contact with ALA 110 (chain K). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    106K  THR      3.0    13.4    +      -       -      +
    107K  ALA*     3.3    13.2    -      -       -      +
    108K  ILE      3.1     0.2    -      -       -      -
    109K  ILE*     1.3    78.7    -      -       -      +
    111K  GLN*     1.3    57.9    +      -       +      +
    113K  ILE*     3.2     2.7    +      -       -      +
    114K  THR*     2.8    34.1    +      -       -      -
    136K  ARG*     3.6    20.3    -      -       +      +
    139K  LEU*     3.9    20.9    -      -       +      -
----------------------------------------------------------
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Residues in contact with GLN 111 (chain K). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    107K  ALA*     3.2    14.7    +      -       -      +
    108K  ILE*     3.0     8.8    +      -       -      +
    110K  ALA*     1.3    77.6    -      -       +      +
    112K  LYS*     1.3    62.1    +      -       -      +
    114K  THR*     3.5     7.3    +      -       -      -
    115K  ASN*     3.0    31.4    +      -       -      -
    220K  PRO*     4.0    10.6    -      -       +      +
    268K  TYR*     3.3    17.8    +      -       -      -
    283K  VAL*     3.3    18.0    -      -       -      +
    284K  PRO      2.9    22.7    +      -       -      -
    285K  GLU*     3.6    22.8    -      -       +      +
    286K  PHE      3.1    28.6    +      -       -      +
----------------------------------------------------------
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Residues in contact with LYS 112 (chain K). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    108K  ILE      3.1     5.6    +      -       -      +
    109K  ILE*     3.0    14.1    +      -       +      +
    111K  GLN*     1.3    78.0    -      -       -      +
    113K  ILE*     1.3    53.3    +      -       -      +
    115K  ASN*     3.0     5.9    +      -       -      +
    116K  GLN*     2.8    69.1    +      -       +      +
    148K  GLU*     3.4    36.4    +      -       +      +
    152K  ALA*     4.7     8.1    -      -       -      +
    219K  GLU*     3.4    53.2    +      -       +      +
    220K  PRO*     3.9     9.1    -      -       -      +
    222K  ARG*     4.4    11.1    -      -       +      +
    223K  PRO*     4.3     4.2    -      -       +      +
----------------------------------------------------------
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Residues in contact with ILE 113 (chain K). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    109K  ILE*     2.9    21.9    +      -       +      +
    110K  ALA      3.7     6.3    -      -       -      +
    112K  LYS*     1.3    78.9    -      -       +      +
    114K  THR*     1.3    62.6    +      -       -      +
    116K  GLN*     3.1    19.3    +      -       -      +
    117K  SER*     2.9    22.6    +      -       -      -
    132K  LEU*     3.6    35.8    -      -       +      +
    133K  LEU*     4.9     0.4    -      -       -      +
    135K  MET      5.2     0.4    -      -       -      -
    136K  ARG*     4.0    14.4    -      -       +      +
    139K  LEU*     4.2    24.9    -      -       +      -
    147K  ARG*     4.6     2.5    -      -       +      +
    148K  GLU*     4.1    27.1    -      -       -      +
    151K  ALA*     4.3    15.3    -      -       +      -
----------------------------------------------------------
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Residues in contact with THR 114 (chain K). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    110K  ALA      2.8    22.9    +      -       -      -
    111K  GLN*     3.5    11.4    -      -       -      -
    113K  ILE*     1.3    72.9    -      -       -      +
    115K  ASN*     1.3    60.0    +      -       -      +
    117K  SER*     2.4    28.9    +      -       -      +
    118K  LEU*     2.8    29.5    +      -       +      +
    133K  LEU*     5.1     4.7    -      -       +      +
    136K  ARG*     3.4    33.2    +      -       -      +
----------------------------------------------------------
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Residues in contact with ASN 115 (chain K). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    111K  GLN      3.0    21.0    +      -       -      +
    112K  LYS      3.5     3.4    -      -       -      +
    114K  THR*     1.3    76.6    -      -       -      +
    116K  GLN*     1.3    67.7    +      -       -      +
    118K  LEU*     3.9     9.2    -      -       -      +
    119K  HIS*     3.0    20.1    +      -       -      +
    220K  PRO*     3.0    23.8    +      -       -      +
    223K  PRO*     3.7    17.6    -      -       +      +
    286K  PHE*     3.1    23.9    +      -       -      +
    287K  GLY*     3.2    21.0    -      -       -      -
    288K  ILE*     3.3    31.7    +      -       +      +
----------------------------------------------------------
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Residues in contact with GLN 116 (chain K). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    112K  LYS*     2.8    53.7    +      -       +      +
    113K  ILE*     3.4    21.8    -      -       -      +
    115K  ASN*     1.3    71.1    -      -       -      +
    117K  SER*     1.3    63.5    +      -       -      +
    119K  HIS*     3.3     1.8    +      -       -      -
    120K  LEU*     3.0    17.8    +      -       -      +
    132K  LEU*     3.7     5.8    -      -       +      -
    148K  GLU      4.8     0.3    -      -       -      +
    151K  ALA*     4.3    12.5    -      -       -      +
    152K  ALA*     4.2    13.7    +      -       -      +
    155K  TYR*     3.2    63.3    -      -       +      -
    156K  PHE*     4.9     4.2    -      -       -      -
    222K  ARG*     6.3     1.0    -      -       -      +
    223K  PRO*     4.0     8.3    -      -       +      +
    226K  ASP*     4.9     2.4    +      -       -      -
----------------------------------------------------------
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Residues in contact with SER 117 (chain K). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    113K  ILE      2.9    10.7    +      -       -      -
    114K  THR*     2.4    28.6    +      -       -      +
    116K  GLN*     1.3    77.7    -      -       -      +
    118K  LEU*     1.3    59.2    +      -       -      +
    120K  LEU*     2.8    10.5    +      -       -      +
    121K  ALA*     2.8    26.5    +      -       -      -
    129K  ALA*     3.4    20.0    -      -       -      +
    132K  LEU*     3.8    13.9    -      -       -      +
    133K  LEU*     2.9    36.9    -      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 118 (chain K). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    114K  THR*     2.8    34.2    +      -       +      +
    115K  ASN*     3.8    20.9    -      -       -      +
    116K  GLN      3.4     0.2    -      -       -      -
    117K  SER*     1.3    75.3    +      -       -      +
    119K  HIS*     1.3    57.6    +      -       -      +
    121K  ALA*     3.4    11.2    +      -       +      +
    122K  GLN*     2.9    27.0    +      -       -      +
    287K  GLY*     5.2     2.5    -      -       -      -
    288K  ILE*     4.0    27.8    -      -       +      +
----------------------------------------------------------
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Residues in contact with HIS 119 (chain K). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    115K  ASN      3.0    14.7    +      -       -      +
    116K  GLN      3.4     8.3    -      -       -      +
    118K  LEU*     1.3    74.9    -      -       -      +
    120K  LEU*     1.3    64.7    +      -       -      +
    122K  GLN*     3.2    34.3    -      -       -      +
    123K  ARG*     3.2    34.7    +      -       -      +
    155K  TYR*     2.8    29.6    +      -       -      +
    159K  LEU*     3.7    21.6    -      -       +      +
    223K  PRO*     4.7     2.4    +      -       +      -
    226K  ASP*     3.8     7.0    -      -       -      +
    227K  GLN*     3.5    30.8    -      -       +      -
    230K  TYR*     4.3     4.4    -      -       +      +
    288K  ILE*     3.9    11.4    -      -       +      +
----------------------------------------------------------
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Residues in contact with LEU 120 (chain K). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    116K  GLN      3.0    11.9    +      -       -      +
    117K  SER      2.8     7.4    +      -       -      +
    119K  HIS*     1.3    72.7    -      -       -      +
    121K  ALA*     1.3    66.0    +      -       -      +
    123K  ARG*     2.9    14.0    +      -       -      +
    124K  ASP      3.4     0.2    +      -       -      -
    125K  TYR*     3.1    29.0    +      -       +      +
    128K  LYS*     4.1    17.9    -      -       +      +
    129K  ALA*     4.2     8.3    -      -       +      +
    132K  LEU*     3.7    38.8    -      -       +      -
    155K  TYR*     3.8    16.6    -      -       +      +
    158K  THR*     3.8    30.5    -      -       +      +
    159K  LEU*     3.8    26.7    -      -       +      -
----------------------------------------------------------
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Residues in contact with ALA 121 (chain K). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    117K  SER      2.8    11.0    +      -       -      +
    118K  LEU*     3.4    17.3    -      -       +      +
    120K  LEU*     1.3    75.0    -      -       -      +
    122K  GLN*     1.3    57.5    +      -       -      +
    124K  ASP*     2.8    26.0    +      -       -      +
    125K  TYR      4.5     5.6    -      -       -      +
    126K  GLY*     4.8     5.1    +      -       -      +
    129K  ALA*     3.9    15.5    -      -       +      +
----------------------------------------------------------
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Residues in contact with GLN 122 (chain K). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    118K  LEU      2.9    14.8    +      -       -      +
    119K  HIS*     3.2    34.0    -      -       +      +
    121K  ALA*     1.3    77.4    -      -       -      +
    123K  ARG*     1.3    77.9    +      -       -      +
    124K  ASP*     3.5     8.3    +      -       -      +
    227K  GLN*     3.3    24.1    +      -       -      +
    231K  GLU*     5.4     2.6    +      -       -      -
    288K  ILE*     5.9     0.8    +      -       -      -
----------------------------------------------------------
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Residues in contact with ARG 123 (chain K). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    119K  HIS*     3.2    34.6    +      -       -      +
    120K  LEU      2.9     8.1    +      -       -      +
    122K  GLN*     1.3    98.2    +      -       -      +
    124K  ASP*     1.3    70.0    +      -       -      +
    125K  TYR*     3.2    29.3    +      -       +      -
    159K  LEU*     4.2    11.9    -      -       +      -
    227K  GLN*     3.5    11.3    +      -       -      +
    230K  TYR*     3.2    38.8    -      -       +      +
    231K  GLU*     3.1    41.4    +      -       -      +
----------------------------------------------------------
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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