Contacts of the helix formed by residues 102 - 128 (chain G) in PDB entry 2YW7


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 VAL 102 (chain G).
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     42G  VAL*     4.1    12.3    -      -       +      -
     43G  VAL      3.7     8.6    +      -       -      +
     44G  GLY*     5.5     1.1    -      -       -      -
     46G  ASN*     3.6    30.3    -      -       -      +
     47G  PHE*     3.6    17.9    -      -       -      +
     50G  VAL*     3.7    15.7    -      -       +      -
    101G  THR*     1.3    72.3    -      -       -      +
    103G  GLN*     1.3    70.3    +      -       -      +
    105G  HIS      3.4     0.3    +      -       -      -
    106G  LEU*     2.9    53.9    +      -       +      +
    155G  HIS*     5.9     0.2    -      -       +      -
----------------------------------------------------------
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Residues in contact with GLN 103 (chain G). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    101G  THR*     3.2    26.9    -      -       -      +
    102G  VAL*     1.3    82.2    +      -       -      +
    104G  ALA*     1.3    65.4    +      -       -      +
    106G  LEU*     4.2     4.4    -      -       -      +
    107G  ALA*     3.1    25.6    +      -       -      +
    155G  HIS*     4.9    15.9    +      -       +      +
    156G  LEU      5.9     4.6    -      -       -      -
----------------------------------------------------------
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Residues in contact with ALA 104 (chain G). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     97G  VAL*     4.8     5.8    -      -       +      +
    100G  ASP*     3.5    33.4    -      -       +      +
    101G  THR*     3.3    17.9    +      -       -      +
    102G  VAL      3.1     0.2    -      -       -      -
    103G  GLN*     1.3    82.7    -      -       -      +
    105G  HIS*     1.3    60.5    +      -       -      +
    107G  ALA*     3.4     4.9    +      -       -      +
    108G  ALA*     3.2    20.7    +      -       -      +
----------------------------------------------------------
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Residues in contact with HIS 105 (chain G). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     38G  VAL*     3.5    17.6    -      -       +      +
     41G  ASN*     3.9    15.5    +      -       +      -
     42G  VAL*     3.8    23.6    -      -       +      -
     95G  TYR*     2.9    44.2    +      +       -      +
     97G  VAL*     3.6    10.4    -      -       +      +
     98G  GLU      2.7    29.4    +      -       -      -
    100G  ASP*     3.4    22.0    +      -       +      -
    101G  THR      3.1    23.0    +      -       -      +
    102G  VAL      4.1     0.7    -      -       -      +
    104G  ALA*     1.3    75.5    -      -       -      +
    106G  LEU*     1.3    60.4    +      -       +      +
    108G  ALA*     3.2     1.0    +      -       -      -
    109G  LEU*     2.7    35.5    +      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 106 (chain G). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     50G  VAL*     3.7    33.2    -      -       +      -
     53G  MET*     4.9    14.6    -      -       -      -
     54G  ILE*     5.6     0.4    -      -       +      -
    102G  VAL*     2.9    35.9    +      -       +      +
    103G  GLN      4.2     1.6    -      -       -      +
    105G  HIS*     1.3    79.3    -      -       +      +
    107G  ALA*     1.3    53.7    +      -       -      +
    109G  LEU*     4.2    12.3    -      -       +      -
    110G  ASP*     2.8    36.8    +      -       -      +
    152G  VAL*     3.5    19.9    -      -       +      +
    154G  ALA      5.1     1.8    -      -       -      +
    155G  HIS*     3.6    39.0    -      -       +      -
----------------------------------------------------------
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Residues in contact with ALA 107 (chain G). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    103G  GLN      3.1    20.0    +      -       -      +
    104G  ALA*     3.5     5.6    -      -       -      +
    106G  LEU*     1.3    75.6    -      -       -      +
    108G  ALA*     1.3    56.9    +      -       -      +
    110G  ASP*     3.2    13.4    +      -       -      +
    111G  LEU*     2.9    33.2    +      -       +      +
    155G  HIS*     4.3    12.2    +      -       +      +
----------------------------------------------------------
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Residues in contact with ALA 108 (chain G). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     95G  TYR*     3.3    28.9    -      -       +      +
     97G  VAL*     3.8    16.4    -      -       +      -
    104G  ALA      3.2    10.8    +      -       -      +
    105G  HIS      3.5     2.0    -      -       -      +
    107G  ALA*     1.3    77.5    -      -       -      +
    109G  LEU*     1.3    51.2    -      -       -      +
    111G  LEU*     3.1     8.8    +      -       -      +
    112G  VAL*     2.6    40.2    +      -       +      +
----------------------------------------------------------
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Residues in contact with LEU 109 (chain G). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     34G  THR*     5.0     3.1    -      -       +      -
     35G  LEU*     3.8    21.5    -      -       +      -
     38G  VAL*     3.8    44.9    -      -       +      -
     54G  ILE*     3.9    17.7    -      -       +      -
     95G  TYR*     3.9     9.6    -      -       +      -
    105G  HIS      2.7    19.1    +      -       -      +
    106G  LEU*     3.6    15.9    -      -       +      +
    108G  ALA*     1.3    69.1    -      -       -      +
    110G  ASP*     1.3    60.2    +      -       -      +
    112G  VAL*     3.0    14.6    +      -       +      +
    113G  TYR*     2.9    46.1    +      -       +      -
    148G  PHE*     4.6     8.3    -      -       +      -
    152G  VAL*     4.6     7.6    -      -       +      -
----------------------------------------------------------
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Residues in contact with ASP 110 (chain G). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    106G  LEU      2.8    22.4    +      -       -      +
    107G  ALA*     3.4     7.4    -      -       -      +
    109G  LEU*     1.3    73.1    -      -       -      +
    111G  LEU*     1.3    78.7    +      -       -      +
    113G  TYR*     4.9     1.3    -      -       -      -
    114G  ASN*     3.5     8.7    +      -       -      -
    149G  GLN*     2.9    28.0    -      -       -      +
    152G  VAL*     3.9    17.2    -      -       +      +
    153G  ARG*     2.7    46.1    +      -       +      +
    155G  HIS*     5.4     4.0    -      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 111 (chain G). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    107G  ALA*     2.9    17.0    +      -       +      +
    108G  ALA*     3.1    11.6    +      -       -      +
    110G  ASP*     1.3    95.8    +      -       -      +
    112G  VAL*     1.3    64.2    +      -       -      +
    113G  TYR      3.2     0.7    +      -       -      -
    114G  ASN*     3.4    27.7    +      -       +      +
    115G  GLY*     3.7     3.8    +      -       -      -
----------------------------------------------------------
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Residues in contact with VAL 112 (chain G). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     30G  ASP*     5.8     3.4    -      -       -      +
     31G  LEU*     3.9    27.1    -      -       +      -
     34G  THR*     5.1     6.3    -      -       +      -
     95G  TYR*     3.7    31.4    -      -       +      -
    108G  ALA*     2.6    26.5    +      -       +      +
    109G  LEU*     3.3    14.4    -      -       +      +
    111G  LEU*     1.3    75.5    -      -       +      +
    113G  TYR*     1.3    62.9    +      -       +      +
    115G  GLY*     3.5     3.6    +      -       -      -
    116G  VAL*     3.4    23.6    +      -       +      +
----------------------------------------------------------
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Residues in contact with TYR 113 (chain G). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     31G  LEU*     3.4    31.5    -      -       +      +
     35G  LEU*     3.5     7.1    -      -       +      +
     57G  GLN*     3.0    27.5    +      -       -      +
    109G  LEU*     2.9    35.1    +      -       +      +
    110G  ASP*     4.7     0.7    -      -       -      -
    111G  LEU      3.2     0.4    -      -       -      -
    112G  VAL*     1.3    79.5    -      -       +      +
    114G  ASN*     1.3    55.8    +      -       -      +
    116G  VAL*     3.1     5.5    +      -       +      +
    117G  ILE*     2.6    51.6    +      -       +      +
    145G  LEU*     3.8    41.3    -      -       +      -
    148G  PHE*     3.2    36.2    -      +       -      -
    149G  GLN*     3.3    22.4    -      -       +      +
    152G  VAL*     6.0     0.4    -      -       +      -
----------------------------------------------------------
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Residues in contact with ASN 114 (chain G). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    110G  ASP*     3.5    15.4    +      -       -      -
    111G  LEU*     3.4    22.9    +      -       +      +
    112G  VAL      3.4     0.2    -      -       -      -
    113G  TYR*     1.3    74.0    -      -       -      +
    115G  GLY*     1.3    55.8    +      -       -      +
    117G  ILE*     4.7     3.4    -      -       -      -
    118G  GLU*     2.5    48.0    +      -       +      +
    149G  GLN*     3.3    13.4    +      -       -      +
    153G  ARG*     3.4    29.7    +      -       -      +
----------------------------------------------------------
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Residues in contact with GLY 115 (chain G). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    111G  LEU      3.7     4.2    +      -       -      -
    112G  VAL      3.5     6.8    +      -       -      -
    113G  TYR      3.3     0.6    -      -       -      -
    114G  ASN*     1.3    76.8    -      -       -      +
    116G  VAL*     1.3    56.4    +      -       -      +
    118G  GLU*     3.6    11.1    +      -       -      +
    119G  ASP*     2.8    39.8    +      -       -      +
----------------------------------------------------------
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Residues in contact with VAL 116 (chain G). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     27G  THR*     3.5    35.1    -      -       +      +
     28G  TYR*     4.8     7.0    -      -       +      -
     31G  LEU*     4.3    27.8    -      -       +      -
     92G  TRP*     6.0     3.1    -      -       +      -
    112G  VAL*     3.4    20.3    +      -       +      +
    113G  TYR*     3.1    11.5    +      -       +      +
    115G  GLY*     1.3    72.1    -      -       -      +
    117G  ILE*     1.3    61.6    +      -       +      +
    119G  ASP*     3.9     2.6    -      -       -      +
    120G  THR*     2.9    39.5    +      -       -      +
    145G  LEU*     4.6    17.3    -      -       +      -
----------------------------------------------------------
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Residues in contact with ILE 117 (chain G). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    113G  TYR*     2.6    33.6    +      -       +      +
    114G  ASN*     3.8     2.9    -      -       -      +
    116G  VAL*     1.3    70.3    -      -       +      +
    118G  GLU*     1.3    59.0    +      -       -      +
    120G  THR*     3.4     5.8    +      -       -      -
    121G  ARG*     2.8    62.6    +      -       +      +
    142G  ALA*     4.5     7.6    -      -       -      +
    145G  LEU*     3.5    44.6    -      -       +      +
    146G  GLU*     3.7    20.0    -      -       +      +
    149G  GLN*     3.8    26.2    -      -       +      +
----------------------------------------------------------
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Residues in contact with GLU 118 (chain G). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    114G  ASN*     2.5    31.8    +      -       +      +
    115G  GLY*     3.6     9.9    +      -       -      +
    117G  ILE*     1.3    73.1    -      -       -      +
    119G  ASP*     1.3    63.8    +      -       -      +
    121G  ARG*     3.4    16.8    +      -       -      +
    122G  LYS*     3.2    53.0    +      -       -      +
----------------------------------------------------------
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Residues in contact with ASP 119 (chain G). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     24G  GLN*     5.2     5.6    -      -       -      +
     27G  THR*     5.4     7.4    +      -       +      +
     91G  THR*     4.6    10.9    +      -       -      -
     92G  TRP*     4.6    14.9    -      -       -      -
    115G  GLY      2.8    24.5    +      -       -      +
    116G  VAL*     3.9     5.7    -      -       -      +
    118G  GLU*     1.3    73.6    -      -       -      +
    120G  THR*     1.3    66.0    +      -       -      +
    122G  LYS*     3.0    27.1    +      -       -      +
    123G  SER*     3.0    24.1    +      -       -      -
----------------------------------------------------------
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Residues in contact with THR 120 (chain G). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     24G  GLN*     2.5    27.0    +      -       -      +
     28G  TYR*     4.6     3.5    +      -       -      +
    116G  VAL*     2.9    27.1    +      -       -      +
    117G  ILE*     3.6     6.7    -      -       -      -
    119G  ASP*     1.3    73.6    -      -       -      +
    121G  ARG*     1.3    66.5    +      -       -      +
    123G  SER*     3.2     3.9    +      -       -      +
    124G  ILE*     3.0    39.0    +      -       +      +
    138G  LEU*     3.6    24.7    -      -       +      +
    142G  ALA*     3.8    22.0    -      -       +      +
    145G  LEU*     4.6     4.2    -      -       +      +
----------------------------------------------------------
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Residues in contact with ARG 121 (chain G). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    117G  ILE*     2.8    46.4    +      -       +      +
    118G  GLU*     3.5    12.6    -      -       -      +
    120G  THR*     1.3    76.0    -      -       -      +
    122G  LYS*     1.3    58.2    +      -       +      +
    124G  ILE*     3.4    13.2    +      -       +      +
    125G  GLU*     3.1    39.2    +      -       -      +
    142G  ALA*     5.3     5.8    -      -       +      -
    146G  GLU*     3.6    28.7    +      -       -      +
    149G  GLN*     5.3     6.5    -      -       -      +
----------------------------------------------------------
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Residues in contact with LYS 122 (chain G). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    118G  GLU*     3.2    42.1    +      -       -      +
    119G  ASP*     3.0    24.4    +      -       -      +
    121G  ARG*     1.3    73.2    -      -       +      +
    123G  SER*     1.3    58.6    +      -       -      +
    124G  ILE      3.0     4.5    -      -       -      -
    125G  GLU*     2.9    33.2    +      -       -      +
    126G  LYS*     3.0    22.4    +      -       +      +
----------------------------------------------------------
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Residues in contact with SER 123 (chain G). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     20G  LEU*     4.2    28.3    +      -       -      +
     23G  LYS*     6.0     1.2    -      -       -      +
     24G  GLN*     4.3    10.3    +      -       -      -
    119G  ASP      3.0    12.3    +      -       -      -
    120G  THR*     3.2     8.0    +      -       -      -
    122G  LYS*     1.3    73.4    -      -       -      +
    124G  ILE*     1.3    56.4    +      -       -      +
    126G  LYS*     3.7    11.7    -      -       -      +
    127G  LEU*     2.9    38.3    +      -       -      +
    138G  LEU*     4.3    17.3    -      -       -      -
----------------------------------------------------------
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Residues in contact with ILE 124 (chain G). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    120G  THR*     3.0    35.9    -      -       +      +
    121G  ARG*     3.5    11.2    -      -       +      +
    122G  LYS      3.0     0.6    -      -       -      -
    123G  SER*     1.3    75.7    -      -       -      +
    125G  GLU*     1.3    60.6    +      -       +      +
    126G  LYS      3.0     5.4    +      -       -      -
    127G  LEU*     5.2     0.2    -      -       -      -
    128G  GLU*     3.6     6.8    +      -       -      +
    135G  GLN*     3.2    46.8    +      -       -      +
    138G  LEU*     3.8    34.5    -      -       +      +
    139G  ILE*     3.7    20.6    -      -       +      -
    142G  ALA*     4.0     7.9    -      -       +      -
----------------------------------------------------------
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Residues in contact with GLU 125 (chain G). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    121G  ARG*     3.1    22.0    +      -       -      +
    122G  LYS*     2.9    18.7    +      -       -      +
    124G  ILE*     1.3    74.4    -      -       +      +
    126G  LYS*     1.3    62.4    +      -       +      +
    128G  GLU*     4.3    12.1    -      -       -      +
    129G  ASP*     4.8     5.9    -      -       -      +
----------------------------------------------------------
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Residues in contact with LYS 126 (chain G). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     16G  ASP*     5.8     1.8    +      -       -      -
     20G  LEU*     3.5    39.3    -      -       +      +
     23G  LYS*     5.4     3.2    -      -       -      +
    122G  LYS*     3.2    18.6    -      -       +      +
    123G  SER*     3.7     9.9    -      -       -      +
    124G  ILE      3.0     0.6    -      -       -      -
    125G  GLU*     1.3    80.5    -      -       +      +
    127G  LEU*     1.3    54.0    +      -       -      +
    128G  GLU      2.7    16.9    +      -       -      -
    129G  ASP*     2.9    18.3    +      -       -      +
    130G  LEU*     3.3    16.1    -      -       +      +
----------------------------------------------------------
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Residues in contact with LEU 127 (chain G). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     17G  VAL*     3.5    39.9    -      -       +      -
     20G  LEU*     3.8    23.8    -      -       +      -
     21G  LEU*     4.7     5.2    -      -       +      -
    123G  SER*     2.9    30.3    +      -       -      +
    124G  ILE      3.7     0.4    +      -       -      -
    126G  LYS*     1.3    70.6    -      -       -      +
    128G  GLU*     1.3    56.6    +      -       -      +
    129G  ASP      3.2     0.9    -      -       -      -
    130G  LEU*     3.1     7.1    +      -       +      +
    131G  ASP      2.9    36.1    +      -       -      +
    132G  LEU      3.6     1.2    +      -       -      -
    134G  SER*     3.9    12.6    -      -       -      +
    135G  GLN*     3.4    40.1    -      -       +      +
    138G  LEU*     4.3    15.5    -      -       +      -
----------------------------------------------------------
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Residues in contact with GLU 128 (chain G). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    124G  ILE      3.6     9.7    +      -       -      +
    125G  GLU*     4.3    10.5    -      -       -      +
    126G  LYS      2.7     5.5    +      -       -      +
    127G  LEU*     1.3    75.3    -      -       -      +
    129G  ASP*     1.3    64.8    +      -       -      +
    130G  LEU      3.8     0.2    +      -       -      -
    132G  LEU*     5.0    17.9    -      -       +      +
    135G  GLN*     3.7    27.0    +      -       -      +
----------------------------------------------------------
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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