Contacts of the helix formed by residues 86 - 111 (chain G) in PDB entry 1GUL


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 LEU 86 (chain G).
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     85G  ASN*     1.3    73.2    -      -       -      +
     87G  LYS*     1.3    64.9    -      -       +      +
     89G  ARG*     4.0    15.7    -      -       +      +
     90G  THR*     2.5    53.6    +      -       -      +
     74H  TYR*     4.1    16.6    -      -       +      -
     77H  ASP*     4.2    28.3    -      -       +      +
     78H  LYS*     4.0    32.3    -      -       +      +
----------------------------------------------------------
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Residues in contact with LYS 87 (chain G). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     85G  ASN*     2.8    17.5    +      -       -      +
     86G  LEU*     1.3    88.9    -      -       +      +
     88G  GLU*     1.3    60.2    -      -       +      +
     90G  THR*     3.4     5.4    -      -       -      +
     91G  LEU*     3.2    27.8    +      -       +      +
     61H  ASP*     5.3     2.8    +      -       -      +
     63H  MET*     4.1    25.4    -      -       +      +
     74H  TYR*     3.5    34.1    +      -       -      -
     78H  LYS*     5.0     5.6    -      -       -      +
----------------------------------------------------------
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Residues in contact with GLU 88 (chain G). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     83G  GLY*     3.5    14.3    -      -       -      -
     84G  LYS*     2.8    31.8    +      -       -      +
     85G  ASN*     3.0    32.9    +      -       -      +
     87G  LYS*     1.3    71.6    -      -       +      +
     89G  ARG*     1.3    69.0    +      -       -      +
     90G  THR      3.0     1.3    -      -       -      -
     91G  LEU*     2.8    16.9    +      -       +      +
     92G  ILE*     2.9    19.1    +      -       -      +
    149G  VAL*     3.9    18.6    -      -       +      +
    150G  GLY*     4.0    24.6    -      -       -      -
    152G  GLN*     5.5     2.6    -      -       -      +
----------------------------------------------------------
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Residues in contact with ARG 89 (chain G). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     73G  HIS*     5.3     2.4    -      -       -      +
     77G  ASP*     2.7    43.0    +      -       -      -
     82G  PHE*     3.6    56.8    +      -       +      +
     85G  ASN      2.8    20.8    +      -       -      +
     86G  LEU*     3.4    22.0    -      -       +      +
     88G  GLU*     1.3    73.1    -      -       -      +
     90G  THR*     1.3    65.0    +      -       -      +
     92G  ILE*     3.6     1.7    -      -       -      +
     93G  ASP*     2.9    27.0    +      -       +      +
     77H  ASP*     5.0     1.8    -      -       -      -
     89H  ARG*     3.8    33.8    -      -       -      +
----------------------------------------------------------
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Residues in contact with THR 90 (chain G). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     86G  LEU*     2.5    44.8    +      -       -      +
     87G  LYS*     3.4     6.8    -      -       -      +
     89G  ARG*     1.3    76.6    -      -       -      +
     91G  LEU*     1.3    62.9    +      -       +      +
     93G  ASP*     3.3     6.6    +      -       +      +
     94G  MET*     3.0    30.1    +      -       +      +
     63H  MET*     4.1    22.6    -      -       +      +
     65H  LEU*     4.1    19.1    -      -       +      -
     70H  SER*     5.3     3.8    -      -       -      +
     74H  TYR*     4.0    19.2    -      -       +      +
----------------------------------------------------------
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Residues in contact with LEU 91 (chain G). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     87G  LYS*     3.2    19.9    +      -       +      +
     88G  GLU*     2.8    14.6    +      -       +      +
     90G  THR*     1.3    69.7    -      -       +      +
     92G  ILE*     1.3    67.8    +      -       -      +
     94G  MET*     3.2    12.2    +      -       -      +
     95G  TYR*     2.8    57.0    +      -       +      +
    149G  VAL*     4.0    21.8    -      -       +      -
     51H  LEU*     6.4     0.2    -      -       +      -
     63H  MET*     6.0     4.7    -      -       +      -
----------------------------------------------------------
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Residues in contact with ILE 92 (chain G). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     81G  LEU      4.3     0.4    -      -       -      +
     82G  PHE*     3.7    23.1    -      -       +      -
     83G  GLY*     3.5    31.2    -      -       -      +
     88G  GLU      2.9    15.2    +      -       -      +
     89G  ARG      3.6     3.6    -      -       -      +
     91G  LEU*     1.3    74.7    -      -       -      +
     93G  ASP*     1.3    64.1    +      -       -      +
     95G  TYR*     3.6     1.6    -      -       -      +
     96G  VAL*     2.9    31.0    +      -       +      +
    149G  VAL*     3.9    25.1    -      -       +      +
    154G  SER*     3.5    23.8    -      -       -      +
    155G  LEU*     4.2    10.3    -      -       +      -
    156G  ALA*     3.9    26.5    -      -       -      +
----------------------------------------------------------
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Residues in contact with ASP 93 (chain G). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     73G  HIS*     4.6     4.0    +      -       -      -
     82G  PHE*     4.2    18.5    -      -       +      -
     89G  ARG*     2.9    19.2    +      -       +      +
     90G  THR*     3.4     8.6    -      -       -      +
     92G  ILE*     1.3    78.3    -      -       -      +
     94G  MET*     1.3    64.8    +      -       -      +
     96G  VAL*     3.1     7.0    +      -       -      +
     97G  GLU*     2.8    34.8    +      -       -      +
     70H  SER*     3.1    27.6    +      -       -      +
     73H  HIS*     2.9    35.0    +      -       -      +
----------------------------------------------------------
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Residues in contact with MET 94 (chain G). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     90G  THR*     3.0    20.3    +      -       +      +
     91G  LEU*     3.6    15.3    -      -       -      +
     93G  ASP*     1.3    76.2    -      -       -      +
     95G  TYR*     1.3    69.9    +      -       +      +
     97G  GLU*     3.2     1.8    +      -       -      +
     98G  GLY      2.9    19.8    +      -       -      -
     51H  LEU*     4.4    13.2    -      -       +      -
     52H  PHE*     3.6     9.2    -      -       +      -
     64H  LYS      4.2     3.4    -      -       -      +
     65H  LEU*     3.4    27.6    -      -       +      -
     66H  VAL*     2.6    61.5    -      -       +      +
     67H  GLN*     4.2     3.3    -      -       +      +
     70H  SER*     3.9    20.4    -      -       -      -
----------------------------------------------------------
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Residues in contact with TYR 95 (chain G). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     91G  LEU*     2.8    47.4    +      -       +      +
     92G  ILE      3.6     3.6    -      -       -      +
     94G  MET*     1.3    80.0    -      -       +      +
     96G  VAL*     1.3    61.4    +      -       -      +
     98G  GLY*     3.3     0.5    +      -       -      -
     99G  THR*     2.6    35.2    +      -       -      +
    135G  VAL*     5.3     0.4    -      -       +      -
    136G  PHE*     4.0    20.6    -      +       +      -
    139G  ILE*     3.2    33.7    -      -       +      +
    148G  LEU*     4.3    14.1    -      -       +      -
    149G  VAL*     3.4    31.8    -      -       +      +
    156G  ALA*     3.8    19.1    -      -       +      +
     51H  LEU*     4.1    25.5    -      -       +      +
     52H  PHE*     4.3     6.1    -      +       -      -
----------------------------------------------------------
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Residues in contact with VAL 96 (chain G). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     72G  LEU*     5.4     4.0    -      -       +      -
     73G  HIS*     5.8     3.8    -      -       +      +
     92G  ILE*     2.9    23.0    +      -       +      +
     93G  ASP*     3.3     6.5    -      -       -      +
     95G  TYR*     1.3    79.7    -      -       -      +
     97G  GLU*     1.3    70.0    +      -       -      +
     99G  THR*     3.2     5.8    +      -       -      -
    100G  LEU*     2.8    41.2    +      -       +      +
    155G  LEU*     3.9    24.5    -      -       +      +
    156G  ALA*     3.7    28.9    -      -       -      +
    159G  ILE*     4.5    13.2    -      -       +      -
----------------------------------------------------------
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Residues in contact with GLU 97 (chain G). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     69G  ARG*     2.7    45.0    +      -       -      +
     73G  HIS*     4.2    13.9    +      -       -      -
     93G  ASP*     2.8    26.9    +      -       -      +
     96G  VAL*     1.3    77.9    -      -       -      +
     98G  GLY*     1.3    65.3    +      -       -      +
    100G  LEU*     3.2     7.5    +      -       -      +
    101G  ASP*     3.1    26.0    +      -       -      +
     67H  GLN*     3.4    27.8    -      -       +      +
     69H  ARG*     3.5    19.5    +      -       +      +
     70H  SER*     3.2    24.0    -      -       -      +
     73H  HIS*     5.0     0.7    -      -       -      -
     97H  GLU*     5.5     0.2    -      -       -      +
----------------------------------------------------------
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Residues in contact with GLY 98 (chain G). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     94G  MET      2.9    11.3    +      -       -      -
     97G  GLU*     1.3    76.3    -      -       -      +
     99G  THR*     1.3    64.3    +      -       -      +
    101G  ASP*     2.9    19.4    +      -       -      +
    102G  LEU      3.4     1.2    +      -       -      -
    132G  TYR*     3.3    21.1    -      -       -      -
     52H  PHE*     3.8    18.6    -      -       -      -
     67H  GLN*     3.4    19.6    -      -       -      +
----------------------------------------------------------
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Residues in contact with THR 99 (chain G). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     95G  TYR*     2.6    25.1    +      -       -      +
     96G  VAL*     3.6     4.9    -      -       -      -
     98G  GLY*     1.3    76.9    -      -       -      +
    100G  LEU*     1.3    56.2    +      -       -      +
    102G  LEU*     2.8    27.7    +      -       +      +
    103G  LEU*     2.9    12.0    +      -       -      +
    132G  TYR*     4.5     3.9    -      -       -      -
    136G  PHE*     3.6    19.2    -      -       +      -
    156G  ALA      5.3     1.2    +      -       -      -
    159G  ILE*     3.8    20.0    -      -       +      +
    160G  LEU*     4.1    18.2    -      -       +      +
    163G  THR*     3.4    30.7    -      -       +      +
     52H  PHE*     5.0     0.2    -      -       -      -
----------------------------------------------------------
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Residues in contact with LEU 100 (chain G). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     18G  SER*     4.6     7.2    -      -       -      +
     68G  THR*     5.6     5.2    -      -       +      -
     69G  ARG*     3.8    47.8    -      -       +      +
     72G  LEU*     4.8    14.1    -      -       +      -
     96G  VAL*     2.8    37.8    +      -       +      +
     97G  GLU*     3.2     8.7    +      -       -      +
     99G  THR*     1.3    71.4    -      -       -      +
    101G  ASP*     1.3    63.7    +      -       -      +
    103G  LEU*     3.7    26.9    -      -       +      +
    104G  GLU*     3.0    26.3    +      -       -      +
    159G  ILE*     3.9    14.1    -      -       +      -
----------------------------------------------------------
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Residues in contact with ASP 101 (chain G). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     69G  ARG*     4.6    10.0    +      -       -      -
     97G  GLU*     3.1    13.7    +      -       -      +
     98G  GLY      2.9    12.3    +      -       -      +
    100G  LEU*     1.3    79.7    -      -       -      +
    102G  LEU*     1.3    60.1    +      -       -      +
    104G  GLU*     3.6    14.9    -      -       -      +
    105G  LEU*     4.2     9.0    +      -       -      +
    132G  TYR*     3.7    14.0    +      -       -      +
     54H  GLN*     4.2     4.9    +      -       -      +
     67H  GLN*     3.2    24.0    +      -       -      +
    301H  IBG      3.3    28.1    +      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 102 (chain G). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     98G  GLY      3.4     1.7    +      -       -      +
     99G  THR*     2.8    15.2    +      -       +      +
    101G  ASP*     1.3    78.1    -      -       -      +
    103G  LEU*     1.3    65.4    +      -       -      +
    104G  GLU      3.0     2.8    +      -       -      -
    105G  LEU*     3.0    32.8    +      -       +      +
    106G  LEU*     3.9     3.3    +      -       +      +
    124G  MET*     4.4     6.5    -      -       +      +
    127G  LYS*     4.2    18.2    -      -       +      -
    128G  ALA*     4.2    12.8    -      -       +      +
    132G  TYR*     3.7    48.4    +      -       +      -
    133G  PHE*     4.5     6.5    -      -       +      -
    136G  PHE*     6.3     0.2    -      -       +      -
    160G  LEU*     6.0     1.6    -      -       +      -
    163G  THR*     4.0    20.2    -      -       +      -
    167G  LEU*     4.1    18.2    -      -       +      -
----------------------------------------------------------
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Residues in contact with LEU 103 (chain G). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     18G  SER*     3.8    22.0    -      -       -      +
     99G  THR      2.9    14.3    +      -       -      +
    100G  LEU*     3.7    24.2    -      -       +      +
    102G  LEU*     1.3    78.3    -      -       -      +
    104G  GLU*     1.3    63.5    +      -       -      +
    106G  LEU*     2.8    34.4    +      -       +      +
    107G  ILE*     3.0    27.5    +      -       +      +
    159G  ILE*     4.8     0.4    -      -       +      -
    162G  GLN*     3.8    22.4    -      -       +      +
    163G  THR*     3.8    33.1    -      -       +      +
    166G  ALA*     5.0     3.8    -      -       +      -
----------------------------------------------------------
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Residues in contact with GLU 104 (chain G). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     15G  ARG*     2.9    42.7    +      -       -      -
    100G  LEU      3.0    19.8    +      -       -      +
    101G  ASP*     3.6    12.8    -      -       -      +
    102G  LEU      3.0     0.2    +      -       -      -
    103G  LEU*     1.3    76.9    -      -       -      +
    105G  LEU*     1.3    66.1    +      -       +      +
    107G  ILE*     3.0    12.3    +      -       -      +
    108G  MET*     2.8    52.7    +      -       -      +
    301G  IBG      5.0     0.3    -      -       -      -
----------------------------------------------------------
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Residues in contact with LEU 105 (chain G). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    101G  ASP      4.3     9.0    -      -       -      +
    102G  LEU*     3.3    22.9    -      -       +      +
    104G  GLU*     1.3    80.3    -      -       +      +
    106G  LEU*     1.3    64.9    +      -       +      +
    108G  MET*     4.0    24.7    -      -       +      +
    109G  HIS*     3.1    24.3    +      -       -      +
    120G  GLU*     5.0     8.1    -      -       -      +
    123G  ASN*     4.1    20.2    -      -       -      +
    124G  MET*     3.8    45.2    -      -       +      +
    127G  LYS*     4.2    11.9    -      -       +      -
----------------------------------------------------------
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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
----------------------------------------------------------
    102G  LEU*     4.1    10.3    -      -       +      +
    103G  LEU*     2.8    27.9    +      -       +      +
    105G  LEU*     1.3    83.8    -      -       +      +
    107G  ILE*     1.4    62.8    +      -       +      +
    109G  HIS*     3.3    17.4    +      -       -      +
    110G  PRO*     3.3     6.9    -      -       -      +
    124G  MET*     3.8    24.5    -      -       +      -
    163G  THR*     4.8     1.6    -      -       +      -
    166G  ALA*     4.1    30.1    -      -       +      +
    167G  LEU*     3.9    30.1    -      -       +      -
    170G  LYS*     4.2    20.7    +      -       +      -
    208G  PRO*     5.9     0.5    -      -       -      +
----------------------------------------------------------
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Residues in contact with ILE 107 (chain G). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     14G  GLY*     3.9    28.3    -      -       -      +
     15G  ARG*     4.0    32.1    -      -       +      +
     18G  SER*     6.0     0.4    -      -       -      +
    103G  LEU*     3.0    32.7    +      -       +      +
    104G  GLU*     3.0    23.3    +      -       -      +
    106G  LEU*     1.4    77.7    -      -       +      +
    108G  MET*     1.3    61.3    +      -       -      +
    110G  PRO*     3.5    10.6    -      -       -      +
    111G  PHE*     3.6    14.0    -      -       -      -
    301G  IBG      3.6    26.5    -      -       +      -
----------------------------------------------------------
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Residues in contact with MET 108 (chain G). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    104G  GLU*     2.8    45.4    +      -       -      +
    105G  LEU*     4.0    28.0    -      -       +      +
    107G  ILE*     1.3    74.3    -      -       -      +
    109G  HIS*     1.3    65.8    +      -       -      +
    110G  PRO*     3.3     0.7    -      -       -      -
    111G  PHE*     2.9    23.6    +      -       -      +
    112G  LEU*     3.7    20.6    +      -       +      +
    120G  GLU*     5.4     6.7    -      -       -      +
    301G  IBG      4.6    12.6    -      -       +      -
----------------------------------------------------------
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Residues in contact with HIS 109 (chain G). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    105G  LEU      3.1    12.7    +      -       -      +
    106G  LEU*     3.3    11.9    -      -       -      +
    108G  MET*     1.3    74.7    -      -       -      +
    110G  PRO*     1.3    69.8    -      -       +      +
    111G  PHE      3.0     1.6    +      -       -      -
    112G  LEU*     3.1    21.6    +      -       +      +
    117G  GLN*     2.8    65.1    +      -       +      -
    118G  GLN*     5.7     0.9    -      -       -      -
    120G  GLU*     3.9    12.6    -      -       +      -
    121G  VAL*     3.7    13.4    -      -       +      +
    124G  MET*     3.6    20.6    -      -       +      -
    170G  LYS*     2.7    33.2    +      -       +      +
----------------------------------------------------------
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Residues in contact with PRO 110 (chain G). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    106G  LEU      3.3    10.5    -      -       -      +
    107G  ILE      3.5     8.7    -      -       -      +
    108G  MET      3.3     4.9    -      -       -      -
    109G  HIS*     1.3    98.9    -      -       +      +
    111G  PHE*     1.3    71.1    +      -       +      +
    112G  LEU      3.3     3.9    +      -       -      +
    117G  GLN*     3.6    13.8    +      -       -      +
    170G  LYS*     5.5     1.6    -      -       -      +
    208G  PRO*     3.7    29.8    -      -       +      +
    212G  TYR*     5.4     1.3    -      -       +      -
    213G  VAL*     3.8    32.5    -      -       +      +
    217G  TYR*     5.1     0.2    +      -       -      -
----------------------------------------------------------
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Residues in contact with PHE 111 (chain G). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     14G  GLY*     6.4     0.2    -      -       -      -
    107G  ILE      3.6    24.5    -      -       -      -
    108G  MET*     2.9    11.5    +      -       -      +
    110G  PRO*     1.3    87.6    -      -       +      +
    112G  LEU*     1.3    65.1    +      -       -      +
    113G  LYS*     4.6     6.8    +      -       -      +
    212G  TYR*     3.9    19.5    -      +       -      -
    213G  VAL*     3.8    18.6    -      -       +      -
    216G  VAL*     3.0    37.2    -      -       +      -
    217G  TYR*     3.7    39.2    +      +       +      +
    301G  IBG      4.1    30.7    -      +       +      -
----------------------------------------------------------
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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