Contacts of the helix formed by residues 97 - 123 (chain B) 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 B).
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     95B  ALA      3.9     9.0    -      -       -      +
     96B  TRP*     1.3    73.2    -      -       -      +
     98B  GLU*     1.3    64.2    +      -       -      +
     99B  GLU*     3.8     6.3    +      -       -      +
    100B  ARG*     3.0    28.1    +      -       -      +
    101B  LYS*     3.0    22.3    +      -       -      +
    276B  LEU      5.4     0.2    +      -       -      -
    278B  GLN*     3.5    18.9    +      -       -      +
----------------------------------------------------------
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Residues in contact with GLU 98 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     96B  TRP      3.9     1.0    +      -       -      -
     97B  THR*     1.3    74.7    -      -       -      +
     99B  GLU*     1.3    62.5    +      -       -      +
    101B  LYS*     3.4    31.7    +      -       -      +
    102B  GLY      3.1    16.8    +      -       -      -
    142B  PHE*     3.6    24.6    -      -       +      -
    202B  LEU      5.1     1.4    -      -       -      +
----------------------------------------------------------
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Residues in contact with GLU 99 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     97B  THR*     3.1     6.4    +      -       -      +
     98B  GLU*     1.3    79.8    -      -       -      +
    100B  ARG*     1.3    58.8    +      -       -      +
    102B  GLY*     3.1     3.6    +      -       -      -
    103B  GLN*     2.9    52.1    +      -       +      +
    141B  LEU*     4.1    12.4    -      -       +      +
----------------------------------------------------------
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Residues in contact with ARG 100 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     96B  TRP*     5.9     0.4    -      -       +      -
     97B  THR*     3.0    24.0    +      -       -      +
     99B  GLU*     1.3    78.3    -      -       -      +
    101B  LYS*     1.3    62.3    +      -       -      +
    103B  GLN*     3.3    23.4    +      -       -      +
    104B  VAL*     3.0    32.5    +      -       -      +
    275B  VAL*     3.0    30.6    +      -       -      +
    276B  LEU*     3.7    28.5    -      -       +      +
    278B  GLN*     3.4    33.8    +      -       -      +
    280B  GLU      3.5    15.0    +      -       -      -
    281B  GLU*     3.1    34.6    +      -       -      +
    282B  GLY      5.2     0.6    -      -       -      +
----------------------------------------------------------
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Residues in contact with LYS 101 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     96B  TRP*     4.0    34.4    +      -       +      -
     97B  THR      3.0    14.5    +      -       -      +
     98B  GLU*     3.4    37.6    +      -       -      +
    100B  ARG*     1.3    75.6    -      -       -      +
    102B  GLY*     1.3    54.3    +      -       -      +
    104B  VAL*     3.4     0.7    +      -       -      +
    105B  TRP*     2.7    38.1    +      -       -      +
    142B  PHE*     3.8     8.1    -      -       +      -
    201B  GLY      4.7     7.1    +      -       -      +
    202B  LEU*     4.0    41.5    +      -       +      +
    276B  LEU*     4.0    10.3    -      -       +      -
----------------------------------------------------------
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Residues in contact with GLY 102 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     98B  GLU      3.1     7.9    +      -       -      -
     99B  GLU      3.1     6.7    +      -       -      -
    101B  LYS*     1.3    73.4    -      -       -      +
    103B  GLN*     1.3    56.8    +      -       -      +
    106B  THR*     2.6    39.9    +      -       -      +
    141B  LEU*     4.0    12.1    -      -       -      -
    142B  PHE*     3.2    33.5    -      -       -      -
----------------------------------------------------------
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Residues in contact with GLN 103 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     99B  GLU*     2.9    44.8    +      -       -      +
    100B  ARG*     3.6    30.9    +      -       -      +
    102B  GLY*     1.3    72.7    -      -       -      +
    104B  VAL*     1.3    61.7    +      -       +      +
    106B  THR*     2.9    19.1    +      -       -      -
    107B  ALA*     2.9    19.9    +      -       -      +
    141B  LEU*     4.0    15.0    -      -       +      +
----------------------------------------------------------
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Residues in contact with VAL 104 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    100B  ARG*     3.0    23.7    +      -       -      +
    101B  LYS      3.9     2.5    -      -       -      +
    103B  GLN*     1.3    79.8    -      -       +      +
    105B  TRP*     1.3    66.0    +      -       -      +
    107B  ALA*     3.4     1.6    +      -       -      +
    108B  ILE*     3.0    45.5    +      -       +      +
    202B  LEU*     4.0     9.9    -      -       +      -
    272B  VAL*     4.0    18.8    -      -       +      -
    275B  VAL*     3.4    31.4    -      -       +      -
    276B  LEU*     3.9    16.4    -      -       +      -
    283B  VAL*     4.0    15.0    -      -       +      -
----------------------------------------------------------
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Residues in contact with TRP 105 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    101B  LYS      2.7    23.2    +      -       -      +
    102B  GLY      4.0     2.0    -      -       -      +
    104B  VAL*     1.3    75.3    -      -       -      +
    106B  THR*     1.3    74.6    +      -       +      +
    108B  ILE*     3.2     8.1    +      -       +      +
    109B  ILE*     2.9    62.3    +      -       +      +
    139B  LEU*     5.7     1.3    -      -       +      -
    142B  PHE*     3.7    32.1    -      +       +      -
    143B  ASP*     3.7    20.6    -      -       +      -
    148B  GLU*     3.9    17.3    -      -       -      -
    202B  LEU*     4.1    14.3    -      -       +      +
    203B  LYS*     3.6    44.1    -      -       +      +
    204B  HIS*     5.0     3.8    +      +       -      -
    216B  ASP*     3.6    34.4    +      -       +      +
    219B  GLU*     5.8     0.7    -      -       -      -
----------------------------------------------------------
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Residues in contact with THR 106 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    102B  GLY      2.6    23.2    +      -       -      +
    103B  GLN*     2.9    13.7    +      -       -      -
    105B  TRP*     1.3    88.0    -      -       +      +
    107B  ALA*     1.3    64.9    +      -       -      +
    109B  ILE*     3.3     1.5    +      -       -      +
    110B  ALA*     3.0    25.2    +      -       -      +
    139B  LEU*     4.4    11.6    -      -       +      +
    140B  ARG      3.9     7.2    -      -       -      +
    141B  LEU*     3.5    18.0    -      -       -      +
    142B  PHE      3.0    33.0    -      -       -      +
    143B  ASP      4.4     0.2    -      -       -      +
----------------------------------------------------------
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Residues in contact with ALA 107 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    103B  GLN      2.9    18.4    +      -       -      +
    104B  VAL*     3.5     6.3    -      -       -      +
    106B  THR*     1.3    77.7    +      -       -      +
    108B  ILE*     1.3    61.2    +      -       -      +
    110B  ALA*     3.3     7.7    -      -       -      +
    111B  GLN*     3.2    26.8    +      -       -      +
    283B  VAL*     4.3    24.2    -      -       +      -
----------------------------------------------------------
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Residues in contact with ILE 108 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    104B  VAL*     3.0    33.2    +      -       +      +
    105B  TRP*     3.4    10.1    -      -       +      +
    107B  ALA*     1.3    81.3    -      -       -      +
    109B  ILE*     1.3    66.3    +      -       +      +
    111B  GLN*     2.9    21.5    +      -       -      +
    112B  LYS*     3.1     8.8    +      -       -      +
    202B  LEU*     4.7     5.6    -      -       +      -
    216B  ASP*     3.6    22.7    -      -       +      +
    217B  LEU*     4.2    25.6    -      -       +      +
    219B  GLU*     4.2     4.9    -      -       +      -
    220B  PRO*     3.7    22.8    -      -       +      +
    268B  TYR*     3.9    13.9    -      -       -      +
    272B  VAL*     4.4     8.7    -      -       +      -
    283B  VAL*     4.5     9.6    -      -       +      -
----------------------------------------------------------
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Residues in contact with ILE 109 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    105B  TRP*     2.9    61.2    +      -       +      +
    106B  THR      4.1     2.7    -      -       -      +
    108B  ILE*     1.3    79.2    -      -       +      +
    110B  ALA*     1.3    64.6    +      -       -      +
    112B  LYS*     3.0     8.0    +      -       +      +
    113B  ILE*     2.9    32.8    +      -       +      +
    139B  LEU*     4.8     6.3    -      -       +      -
    148B  GLU*     4.0    32.8    -      -       +      +
    216B  ASP      5.0     0.2    -      -       -      +
    219B  GLU*     3.4    43.7    -      -       +      +
----------------------------------------------------------
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Residues in contact with ALA 110 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    106B  THR      3.0    13.2    +      -       -      +
    107B  ALA*     3.3    13.7    -      -       -      +
    109B  ILE*     1.3    76.4    -      -       -      +
    111B  GLN*     1.3    56.8    +      -       +      +
    113B  ILE*     3.2     3.1    +      -       -      +
    114B  THR*     2.9    34.3    +      -       -      +
    136B  ARG*     3.7    21.0    -      -       +      +
    139B  LEU*     3.9    22.1    -      -       +      +
----------------------------------------------------------
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Residues in contact with GLN 111 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    107B  ALA*     3.2    14.0    +      -       -      +
    108B  ILE*     2.9     9.4    +      -       -      +
    110B  ALA*     1.3    77.8    -      -       +      +
    112B  LYS*     1.3    61.6    +      -       -      +
    114B  THR*     2.5    22.8    +      -       -      -
    115B  ASN*     3.0    19.1    +      -       -      -
    220B  PRO*     4.0    10.3    -      -       +      +
    268B  TYR*     3.3    17.3    +      -       -      -
    283B  VAL*     3.4    18.0    -      -       -      +
    284B  PRO      2.9    22.8    +      -       -      -
    285B  GLU*     3.5    24.2    -      -       +      +
    286B  PHE      3.1    27.8    +      -       -      +
----------------------------------------------------------
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Residues in contact with LYS 112 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    108B  ILE      3.1     6.6    +      -       -      +
    109B  ILE*     3.0    15.7    +      -       +      +
    111B  GLN*     1.3    77.8    -      -       -      +
    113B  ILE*     1.3    52.1    +      -       -      +
    115B  ASN*     3.0     5.8    +      -       -      +
    116B  GLN*     2.8    69.0    +      -       +      +
    148B  GLU*     3.4    34.0    +      -       -      +
    152B  ALA*     4.7     1.6    -      -       -      +
    219B  GLU*     3.4    54.6    +      -       +      +
    220B  PRO*     3.9     9.8    -      -       +      +
    222B  ARG*     4.4    10.7    -      -       +      +
    223B  PRO*     4.3     4.4    -      -       +      +
      5H    G      4.0    22.4    +      -       -      -
      6R    G      5.4     0.4    +      -       -      -
----------------------------------------------------------
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Residues in contact with ILE 113 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    109B  ILE*     2.9    23.9    +      -       +      +
    110B  ALA      3.7     6.1    -      -       -      +
    112B  LYS*     1.3    78.1    -      -       +      +
    114B  THR*     1.3    62.4    +      -       -      +
    116B  GLN*     3.1    18.6    +      -       -      +
    117B  SER*     2.9    22.7    +      -       -      +
    132B  LEU*     3.6    35.4    -      -       +      +
    133B  LEU      4.9     0.2    -      -       -      +
    135B  MET      5.2     0.4    -      -       -      -
    136B  ARG*     4.0    14.8    -      -       +      +
    139B  LEU*     4.3    25.1    -      -       +      -
    147B  ARG*     4.6     2.5    -      -       +      +
    148B  GLU*     4.1    26.2    -      -       -      +
    151B  ALA*     4.3    15.7    -      -       +      -
----------------------------------------------------------
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Residues in contact with THR 114 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    110B  ALA      2.9     8.8    +      -       -      +
    111B  GLN*     2.5    31.1    +      -       -      -
    113B  ILE*     1.3    75.3    -      -       -      +
    115B  ASN*     1.3    63.2    +      -       -      +
    117B  SER*     3.1     3.5    +      -       -      -
    118B  LEU*     2.8    37.7    +      -       -      +
    133B  LEU*     4.3    13.3    -      -       +      +
    136B  ARG*     3.1    46.9    -      -       -      +
    286B  PHE      5.4     0.2    +      -       -      -
----------------------------------------------------------
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Residues in contact with ASN 115 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    111B  GLN      3.0    18.7    +      -       -      +
    112B  LYS      3.0     6.0    +      -       -      +
    114B  THR*     1.3    78.1    +      -       -      +
    116B  GLN*     1.3    65.2    +      -       -      +
    118B  LEU*     3.9     7.8    -      -       -      +
    119B  HIS*     3.0    20.3    +      -       -      +
    220B  PRO*     3.0    23.8    +      -       -      +
    223B  PRO*     3.7    17.6    -      -       +      +
    286B  PHE*     3.1    25.1    +      -       -      +
    287B  GLY*     3.2    21.3    -      -       -      -
    288B  ILE*     3.3    31.4    +      -       +      +
----------------------------------------------------------
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Residues in contact with GLN 116 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    112B  LYS*     2.8    49.4    +      -       +      +
    113B  ILE*     3.4    21.0    -      -       -      +
    115B  ASN*     1.3    78.2    -      -       -      +
    117B  SER*     1.3    61.6    +      -       -      +
    119B  HIS      3.3     1.2    +      -       -      -
    120B  LEU*     3.0    19.8    +      -       -      +
    132B  LEU*     3.7     6.5    -      -       +      -
    148B  GLU      4.8     0.3    -      -       -      +
    151B  ALA*     4.3    12.8    -      -       -      +
    152B  ALA*     4.1    14.0    +      -       -      +
    155B  TYR*     3.3    62.7    -      -       +      -
    156B  PHE*     5.1     3.2    -      -       -      -
    222B  ARG*     6.3     1.2    -      -       -      +
    223B  PRO*     4.3     8.7    -      -       +      -
    226B  ASP*     5.0     2.0    +      -       -      -
      5H    G      5.8     0.2    +      -       -      -
----------------------------------------------------------
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Residues in contact with SER 117 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    113B  ILE      2.9    11.2    +      -       -      -
    114B  THR      3.4     8.1    -      -       -      -
    116B  GLN*     1.3    77.0    -      -       -      +
    118B  LEU*     1.3    52.3    +      -       -      +
    120B  LEU*     2.8    10.4    +      -       -      +
    121B  ALA*     2.8    31.8    +      -       -      +
    129B  ALA*     3.1    23.3    +      -       -      +
    132B  LEU*     2.7    36.8    -      -       -      +
    133B  LEU*     3.5    19.6    +      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 118 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    114B  THR*     2.8    28.1    +      -       -      +
    115B  ASN*     3.8    20.9    -      -       -      +
    117B  SER*     1.3    74.3    -      -       -      +
    119B  HIS*     1.3    57.2    +      -       -      +
    121B  ALA*     3.4    10.5    +      -       +      +
    122B  GLN*     2.9    27.9    +      -       -      +
    287B  GLY*     5.2     2.2    -      -       -      -
    288B  ILE*     4.1    28.0    -      -       +      +
----------------------------------------------------------
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Residues in contact with HIS 119 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    115B  ASN      3.0    17.7    +      -       -      +
    116B  GLN      3.4     4.9    -      -       -      +
    118B  LEU*     1.3    75.7    -      -       -      +
    120B  LEU*     1.3    64.3    +      -       -      +
    122B  GLN*     3.2    19.5    -      -       -      +
    123B  ARG*     3.2    41.5    +      -       -      +
    155B  TYR*     2.8    29.9    +      -       -      +
    159B  LEU*     3.7    21.2    -      -       +      +
    223B  PRO*     4.7     2.0    +      -       +      -
    226B  ASP*     3.8     6.5    -      -       -      +
    227B  GLN*     3.5    39.8    -      -       +      -
    230B  TYR*     4.2     4.9    -      -       +      +
    288B  ILE*     3.9    11.6    -      -       +      +
----------------------------------------------------------
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Residues in contact with LEU 120 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    116B  GLN      3.0    11.7    +      -       -      +
    117B  SER      2.8    11.2    +      -       -      +
    119B  HIS*     1.3    69.6    -      -       -      +
    121B  ALA*     1.3    68.4    +      -       -      +
    123B  ARG*     2.9    14.9    +      -       -      -
    125B  TYR*     3.1    28.5    +      -       +      +
    128B  LYS*     4.1    18.2    -      -       +      +
    129B  ALA*     4.1     9.0    -      -       +      +
    132B  LEU*     3.7    38.8    -      -       +      -
    155B  TYR*     3.8    16.4    -      -       +      +
    158B  THR*     3.8    28.7    -      -       +      +
    159B  LEU*     3.8    27.8    -      -       +      -
----------------------------------------------------------
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Residues in contact with ALA 121 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    117B  SER      2.8    15.0    +      -       -      +
    118B  LEU*     3.4    16.4    -      -       +      +
    120B  LEU*     1.3    71.9    -      -       -      +
    122B  GLN*     1.3    60.3    +      -       -      +
    124B  ASP*     2.8    25.5    +      -       -      +
    125B  TYR      4.5     4.9    -      -       -      +
    126B  GLY*     4.8     5.5    +      -       -      +
    129B  ALA*     3.9    15.8    -      -       +      +
----------------------------------------------------------
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Residues in contact with GLN 122 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    118B  LEU      2.9    15.0    +      -       -      +
    119B  HIS*     3.2    16.7    -      -       -      +
    121B  ALA*     1.3    76.9    -      -       -      +
    123B  ARG*     1.3    93.8    +      -       -      +
    124B  ASP*     3.3     8.5    +      -       -      +
    227B  GLN*     3.0    29.1    +      -       -      +
    231B  GLU*     4.4     2.8    -      -       -      +
    288B  ILE*     5.1     6.1    +      -       -      +
----------------------------------------------------------
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Residues in contact with ARG 123 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    119B  HIS*     3.2    32.2    +      -       -      +
    120B  LEU      2.9     8.7    +      -       -      +
    122B  GLN*     1.3   101.8    +      -       -      +
    124B  ASP*     1.3    70.0    +      -       -      +
    125B  TYR*     3.2    28.4    +      -       +      -
    159B  LEU*     4.2    11.4    -      -       +      -
    227B  GLN*     3.5    11.5    +      -       -      +
    230B  TYR*     3.2    38.9    -      -       +      +
    231B  GLU*     3.1    40.2    +      -       -      +
----------------------------------------------------------
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A short description of the analytical approach
The contact analysis used in this page is based upon the approach developed in: Sobolev V., Wade R.C., Vriend G. and Edelman M. PROTEINS (1996) 25, 120-129. Contact legitimacy depends on the hydrophobic-hydrophilic properties of the contacting atoms. In order to define it, for each inter-atomic contact, eight atom classes have been introduced:


   I  Hydrophilic      - N and O that can donate and accept hydrogen bonds
                         (e.g., oxygen of hydroxyl group of Ser. or Thr)
  II  Acceptor         - N or O that can only accept a hydrogen bond
 III  Donor            - N that can only donate a hydrogen bond
  IV  Hydrophobic      - Cl, Br, I and all C atoms that are not in
                         aromatic rings and do not have a covalent bond to
                         a N or O atom
   V  Aromatic         - C in aromatic rings irrespective of any other 
                         bonds formed by the atom
  VI  Neutral          - C atoms that have a covalent bond to at least one
                         atom of class I or two or more atoms from class II
                         or III; atoms; S, F, P, and metal atoms in all cases
 VII  Neutral-donor    - C atoms that have a covalent bond with only one
                         atom of class III
VIII  Neutral-acceptor - C atoms that have a covalent bond with only 
                         one atom of class II
For each pair of contacts the state of legitimacy is shown below:

Legend:
+, legitimate
-, illegitimate
------------------------------------------------------------
  Atomic class           I  II  III   IV   V   VI  VII  VIII
------------------------------------------------------------
   I  (Hydrophilic)      +   +    +    -   +   +    +    +
  II  (Acceptor)         +   -    +    -   +   +    +    -
 III  (Donor)            +   +    -    -   +   +    -    +
  IV  (Hydrophobic)      -   -    -    +   +   +    +    +
   V  (Aromatic)         +   +    +    +   +   +    +    +
  VI  (Neutral)          +   +    +    +   +   +    +    +
 VII  (Neutral-donor)    +   +    -    +   +   +    -    +
VIII  (Neutral-acceptor) +   -    +    +   +   +    +    -
------------------------------------------------------------
Warning!
Atom classes for heterogroups are automatically assigned based on the atomic coordinates. However, in three cases (see below) the automatic assignment is currently ambiguous. In these cases, the user is advised to manually analyse the full list of contacts using LPC software.
1. Carbon atoms belonging to a 4-, 5- or 6-member ring are 
   considered "aromatic" (Class V) if the ring is approximately
   planar, and "hydrophobic" (Class IV) or "neutral" (Classes
   VI, VII, VIII) if the ring is non-planar.
2. The oxygen atom of a carbonyl or hydroxy group is considered
   "hydroxy" (Class I) if the CO bond is longer than 1.29 Å, and
   "carbonyl" (Class II) if shorter.
3. All nitrogen atoms are considered "hydrophilic" (Class I).

Please E-mail any questions and/or suggestions concerning this page to Vladimir.Sobolev@weizmann.ac.il