Contacts of the helix formed by residues 90 - 115 (chain G) in PDB entry 4GTU


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 GLU 90 (chain G).
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     88G  GLU      4.2     0.6    +      -       -      -
     89G  THR*     1.3    72.0    -      -       -      +
     91G  GLU*     1.3    64.2    +      -       -      +
     93G  LYS*     3.3    12.3    +      -       +      +
     94G  ILE*     3.1    26.7    +      -       -      +
     67H  HIS*     4.5     7.3    -      -       +      -
     78H  TYR*     3.2    24.9    -      -       -      -
     81H  ARG*     2.7    47.4    +      -       +      -
     82H  LYS*     3.7    22.9    -      -       +      +
----------------------------------------------------------
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Residues in contact with GLU 91 (chain G). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     89G  THR*     3.6    17.9    +      -       -      +
     90G  GLU*     1.3    78.3    -      -       -      +
     92G  GLU*     1.3    68.4    +      -       -      +
     94G  ILE*     3.1    20.1    +      -       -      +
     95G  ARG*     3.4    19.8    +      -       +      +
     67H  HIS*     5.5     7.2    -      -       -      +
----------------------------------------------------------
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Residues in contact with GLU 92 (chain G). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     87G  GLY*     4.3     1.6    -      -       -      -
     88G  GLU*     3.1    36.6    -      -       -      +
     89G  THR*     2.9    30.0    +      -       -      +
     91G  GLU*     1.3    87.2    -      -       +      +
     93G  LYS*     1.3    62.6    +      -       -      +
     95G  ARG*     3.0    13.4    +      -       -      +
     96G  VAL*     2.9    27.0    +      -       -      +
    148G  VAL*     3.8    26.3    -      -       +      +
    149G  GLY*     5.3     2.6    -      -       -      -
    150G  ASP      5.3     0.9    +      -       -      -
    151G  LYS*     3.6    28.0    -      -       -      +
----------------------------------------------------------
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Residues in contact with LYS 93 (chain G). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     86G  CYS*     6.3     0.9    -      -       -      -
     87G  GLY*     4.0    29.4    -      -       -      -
     88G  GLU      4.3    11.0    +      -       -      -
     89G  THR      2.7    18.0    +      -       -      +
     90G  GLU*     3.5    13.5    -      -       -      +
     91G  GLU      3.2     0.2    -      -       -      -
     92G  GLU*     1.3    72.4    -      -       -      +
     94G  ILE*     1.3    57.6    +      -       -      +
     96G  VAL*     3.1     5.5    +      -       -      +
     97G  ASP*     3.0    33.8    +      -       -      +
     81H  ARG*     3.2    44.4    -      -       -      +
----------------------------------------------------------
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Residues in contact with ILE 94 (chain G). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     90G  GLU*     3.2    30.5    -      -       -      +
     91G  GLU*     3.1    11.0    +      -       -      +
     93G  LYS*     1.3    76.5    -      -       -      +
     95G  ARG*     1.3    62.1    +      -       +      +
     97G  ASP*     3.7     5.1    -      -       -      +
     98G  ILE*     3.2    28.6    +      -       +      +
     67H  HIS*     4.1    22.7    -      -       +      +
     68H  LYS      5.5     1.1    -      -       -      +
     69H  ILE*     3.6    37.0    -      -       +      -
     78H  TYR*     3.5    24.9    -      -       +      -
     81H  ARG*     3.4     9.0    -      -       -      +
----------------------------------------------------------
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Residues in contact with ARG 95 (chain G). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     91G  GLU*     3.5    21.1    -      -       +      +
     92G  GLU*     3.0    10.5    +      -       -      +
     94G  ILE*     1.3    77.8    -      -       +      +
     96G  VAL*     1.3    65.7    +      -       -      +
     99G  LEU*     3.3    26.5    +      -       -      +
    140G  PHE*     2.9    64.2    +      -       +      +
    144G  ARG*     3.0    43.7    -      -       -      +
    147G  PHE      2.8    22.2    +      -       -      -
    148G  VAL*     3.5    32.0    +      -       +      +
     55H  ASP*     4.5     5.1    +      -       -      -
----------------------------------------------------------
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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
----------------------------------------------------------
     86G  CYS*     4.4     9.9    -      -       -      -
     87G  GLY*     3.6    25.4    -      -       -      +
     92G  GLU      2.9    19.4    +      -       -      +
     93G  LYS*     3.1     7.8    +      -       -      +
     95G  ARG*     1.3    77.6    -      -       -      +
     97G  ASP*     1.3    69.6    +      -       -      +
    100G  GLU*     3.2    23.0    +      -       -      +
    148G  VAL*     3.6    18.2    -      -       +      -
    153G  THR*     4.6     4.5    -      -       +      -
    154G  PHE*     3.5    36.3    -      -       +      -
    155G  VAL*     3.3    12.8    -      -       +      +
----------------------------------------------------------
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Residues in contact with ASP 97 (chain G). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     93G  LYS*     3.0    16.1    +      -       -      +
     94G  ILE*     3.7     9.4    -      -       +      +
     95G  ARG      3.3     0.2    -      -       -      -
     96G  VAL*     1.3    78.5    -      -       -      +
     98G  ILE*     1.3    68.7    +      -       -      +
    100G  GLU*     2.8    19.0    +      -       -      +
    101G  ASN*     2.9    21.8    +      -       -      +
     69H  ILE*     5.7     0.2    -      -       +      -
     74H  ALA*     3.9    23.6    -      -       +      +
     77H  CYS*     3.5    21.4    -      -       -      +
     81H  ARG*     2.7    27.7    +      -       -      -
----------------------------------------------------------
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Residues in contact with ILE 98 (chain G). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     94G  ILE*     3.2    19.8    +      -       +      +
     97G  ASP*     1.3    78.9    -      -       -      +
     99G  LEU*     1.3    59.1    +      -       -      +
    100G  GLU      3.0     0.3    +      -       -      -
    101G  ASN*     3.3     2.7    +      -       -      +
    102G  GLN*     2.7    36.5    +      -       +      +
    140G  PHE*     4.2    12.1    -      -       +      -
     55H  ASP*     4.8    11.9    -      -       +      +
     56H  PHE*     3.5    35.0    -      -       +      -
     68H  LYS      4.4     6.1    -      -       -      +
     69H  ILE*     3.6    35.9    -      -       +      -
     70H  THR*     3.7    31.2    -      -       -      +
     71H  GLN*     5.4     0.8    -      -       +      +
     74H  ALA*     4.4     1.8    -      -       +      -
----------------------------------------------------------
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Residues in contact with LEU 99 (chain G). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     95G  ARG      3.3    18.9    +      -       -      +
     98G  ILE*     1.3    80.0    -      -       -      +
    100G  GLU*     1.3    60.4    +      -       -      +
    102G  GLN*     4.0     1.8    -      -       +      -
    103G  ALA*     3.1    24.7    +      -       +      +
    137G  PHE*     3.8    21.5    -      -       +      -
    140G  PHE*     3.7    21.1    -      -       +      -
    147G  PHE*     4.1    13.0    -      -       +      -
    155G  VAL*     4.3    20.8    -      -       +      +
    158G  LEU*     4.4     1.9    -      -       -      +
    159G  ALA*     4.1    22.7    -      -       +      -
     56H  PHE*     3.5    36.3    -      -       +      -
----------------------------------------------------------
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Residues in contact with GLU 100 (chain G). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     73G  ASN*     3.3    41.2    +      -       -      +
     77G  CYS*     3.7    19.6    -      -       -      -
     96G  VAL*     3.2    20.6    +      -       -      +
     97G  ASP*     2.8    10.1    +      -       -      +
     99G  LEU*     1.3    79.5    -      -       -      +
    101G  ASN*     1.3    71.2    +      -       -      +
    102G  GLN      3.1     1.6    +      -       -      -
    103G  ALA*     4.0     0.9    -      -       -      +
    104G  MET*     3.2    24.9    +      -       -      +
    154G  PHE*     3.2    34.1    -      -       +      -
    155G  VAL*     4.3     3.6    -      -       +      +
    158G  LEU*     4.1    10.8    -      -       +      +
    100H  GLU*     5.3     4.9    -      -       -      +
    101H  ASN*     5.0     0.7    +      -       -      +
----------------------------------------------------------
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Residues in contact with ASN 101 (chain G). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     73G  ASN*     5.3     2.5    -      -       -      +
     97G  ASP*     2.9    21.8    +      -       -      +
     98G  ILE      4.1     0.4    -      -       -      +
    100G  GLU*     1.3    86.0    -      -       -      +
    102G  GLN*     1.3    56.7    +      -       -      +
    104G  MET*     4.7     3.6    -      -       -      +
    105G  ASP*     3.1    15.9    +      -       -      +
     71H  GLN*     3.1    41.7    +      -       +      +
     73H  ASN*     3.0    42.0    +      -       -      +
     74H  ALA*     4.6     4.9    -      -       +      +
    100H  GLU*     4.5     8.5    +      -       -      -
    104H  MET*     5.2     8.2    -      -       -      +
----------------------------------------------------------
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Residues in contact with GLN 102 (chain G). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     98G  ILE*     2.7    30.6    +      -       +      +
     99G  LEU*     4.4     4.3    -      -       +      -
    101G  ASN*     1.3    73.9    -      -       -      +
    103G  ALA*     1.3    63.7    +      -       -      +
    104G  MET      3.3     0.2    -      -       -      -
    105G  ASP*     3.0    28.9    +      -       -      +
    106G  VAL*     3.1    18.8    +      -       -      +
    109G  GLN*     5.6     0.6    -      -       -      +
    137G  PHE*     4.5     6.3    -      -       +      -
     56H  PHE*     3.8    53.1    -      -       +      +
     57H  PRO      6.0     0.2    +      -       -      -
     58H  ASN*     4.3     8.6    +      -       -      +
     70H  THR*     5.3     1.9    +      -       -      -
     71H  GLN*     2.7    30.9    +      -       +      +
----------------------------------------------------------
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Residues in contact with ALA 103 (chain G). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     99G  LEU*     3.1    32.1    +      -       +      +
    100G  GLU      4.0     0.2    -      -       -      +
    102G  GLN*     1.3    77.7    -      -       -      +
    104G  MET*     1.3    60.9    -      -       -      +
    106G  VAL*     2.8    30.4    -      -       -      +
    107G  SER*     3.0     8.7    +      -       -      -
    137G  PHE*     4.4     7.3    -      -       +      -
    158G  LEU*     3.6    24.7    -      -       +      -
    159G  ALA*     4.9     2.2    -      -       -      +
    162G  VAL*     3.5    13.9    -      -       +      +
----------------------------------------------------------
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Residues in contact with MET 104 (chain G). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     12G  LEU*     4.9    20.4    -      -       +      +
     72G  SER*     4.1    18.2    -      -       -      +
     73G  ASN*     3.2    37.0    -      -       -      +
     76G  LEU*     5.7     1.1    -      -       +      -
    100G  GLU      3.2    14.2    +      -       -      +
    101G  ASN*     4.7     4.0    -      -       -      +
    103G  ALA*     1.3    78.6    -      -       -      +
    105G  ASP*     1.3    61.9    +      -       -      +
    107G  SER*     3.0    27.9    +      -       -      -
    108G  ASN*     3.0    31.5    +      -       -      +
    158G  LEU*     4.5    15.1    -      -       +      +
----------------------------------------------------------
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Residues in contact with ASP 105 (chain G). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    101G  ASN      3.1    19.2    +      -       -      +
    102G  GLN*     3.0    25.9    +      -       -      +
    104G  MET*     1.3    78.6    -      -       -      +
    106G  VAL*     1.3    56.5    +      -       -      +
    108G  ASN*     3.8     7.0    +      -       -      +
    109G  GLN*     2.8    57.4    +      -       -      +
     58H  ASN*     4.7     6.5    +      -       -      -
     71H  GLN*     3.5    17.4    +      -       -      +
----------------------------------------------------------
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Residues in contact with VAL 106 (chain G). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    102G  GLN*     3.1    17.6    +      -       -      +
    103G  ALA*     2.8    26.9    -      -       -      +
    105G  ASP*     1.3    81.7    -      -       -      +
    107G  SER*     1.3    61.6    +      -       -      +
    109G  GLN*     3.2    11.9    +      -       -      +
    110G  LEU*     2.8    31.2    +      -       -      +
    126G  TYR*     3.8    10.4    +      -       -      +
    133G  MET*     4.6    19.3    -      -       +      -
    137G  PHE*     4.3    17.7    -      -       +      -
    162G  VAL*     3.5    30.3    -      -       +      -
    166G  HIS*     4.7     7.8    -      -       +      -
----------------------------------------------------------
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Residues in contact with SER 107 (chain G). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    103G  ALA      3.0    14.7    +      -       -      -
    104G  MET*     3.0    27.8    +      -       -      +
    106G  VAL*     1.3    78.4    -      -       -      +
    108G  ASN*     1.3    54.2    +      -       -      +
    110G  LEU*     3.3     6.0    +      -       -      +
    111G  ALA*     2.7    35.8    +      -       -      +
    158G  LEU*     5.1     2.3    -      -       -      +
    161G  ASP*     5.5     2.6    +      -       -      -
    162G  VAL*     3.8    13.9    -      -       -      +
    165G  LEU*     5.5    10.9    -      -       -      +
    166G  HIS*     5.9     1.1    -      -       -      -
    208G  TYR*     4.8     1.7    +      -       -      -
----------------------------------------------------------
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Residues in contact with ASN 108 (chain G). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     12G  LEU*     5.9     4.2    -      -       -      +
    104G  MET*     3.0    36.4    +      -       -      +
    105G  ASP*     4.1     6.7    -      -       -      +
    107G  SER*     1.3    74.5    -      -       -      +
    109G  GLN*     1.3    59.7    +      -       +      +
    111G  ALA*     3.7     9.1    -      -       -      +
    112G  ARG*     2.6    63.4    +      -       -      +
    104H  MET*     5.5     6.4    -      -       -      +
    108H  ASN*     4.7     5.9    -      -       -      +
----------------------------------------------------------
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Residues in contact with GLN 109 (chain G). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    102G  GLN*     5.6     0.6    -      -       -      +
    105G  ASP*     2.8    46.0    +      -       -      +
    106G  VAL*     3.2    15.3    +      -       -      +
    108G  ASN*     1.3    80.4    -      -       +      +
    110G  LEU*     1.3    59.1    +      -       -      +
    112G  ARG*     4.0     9.7    -      -       -      +
    113G  VAL*     3.5    25.6    +      -       -      +
    126G  TYR*     4.0    16.3    -      -       +      +
    133G  MET*     4.3    16.2    -      -       -      +
     58H  ASN*     6.0     0.4    -      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 110 (chain G). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    106G  VAL      2.8    16.4    +      -       -      +
    107G  SER*     3.7     3.6    -      -       -      +
    109G  GLN*     1.3    76.3    -      -       -      +
    111G  ALA*     1.3    59.7    -      -       -      +
    112G  ARG      3.2     0.4    -      -       -      -
    113G  VAL*     3.2     8.4    -      -       +      +
    114G  CYS*     3.0    34.0    +      -       -      +
    126G  TYR*     4.0    26.7    -      -       +      +
    165G  LEU*     3.6    28.0    -      -       +      -
    166G  HIS*     3.9    19.5    -      -       +      +
    169G  PHE*     3.6    40.8    -      -       +      -
    208G  TYR*     3.1    21.3    -      -       +      +
    214G  TRP*     5.5     0.7    -      -       +      -
----------------------------------------------------------
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Residues in contact with ALA 111 (chain G). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    107G  SER      2.7    22.3    +      -       -      +
    108G  ASN*     3.7    11.4    -      -       -      +
    110G  LEU*     1.3    74.7    -      -       -      +
    112G  ARG*     1.3    57.5    +      -       -      +
    115G  TYR*     3.0    41.1    +      -       +      +
    208G  TYR*     3.8    21.5    +      -       +      -
----------------------------------------------------------
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Residues in contact with ARG 112 (chain G). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    108G  ASN*     2.6    42.2    +      -       -      +
    109G  GLN*     4.0    10.6    -      -       -      +
    111G  ALA*     1.3    76.1    -      -       -      +
    113G  VAL*     1.3    60.1    +      -       +      +
    115G  TYR*     4.1     3.0    -      -       -      +
    116G  SER*     2.8    34.6    +      -       -      +
    122G  LEU*     5.5     0.2    -      -       -      -
    108H  ASN*     3.5    21.0    +      -       -      +
    112H  ARG*     3.1    53.3    -      -       -      +
----------------------------------------------------------
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Residues in contact with VAL 113 (chain G). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    109G  GLN      3.5    15.7    +      -       -      +
    110G  LEU*     3.2    23.3    -      -       +      +
    112G  ARG*     1.3    76.4    -      -       +      +
    114G  CYS*     1.3    69.8    +      -       -      +
    116G  SER*     3.6    16.6    +      -       -      +
    119G  PHE*     3.9    17.7    -      -       +      -
    122G  LEU*     4.1    38.9    -      -       +      +
    123G  LYS*     5.6     1.8    -      -       -      +
    126G  TYR*     4.6    19.5    -      -       +      -
    169G  PHE*     5.6     4.3    -      -       +      -
----------------------------------------------------------
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Residues in contact with CYS 114 (chain G). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    110G  LEU*     3.0    24.6    +      -       -      +
    111G  ALA      3.9     0.7    -      -       -      +
    113G  VAL*     1.3    80.5    -      -       -      +
    115G  TYR*     1.3    60.9    +      -       -      +
    119G  PHE*     4.3     7.6    -      -       -      -
    169G  PHE*     3.7    18.2    -      -       -      -
    208G  TYR*     3.9    22.2    -      -       +      -
    212G  ALA*     5.2     0.2    -      -       -      -
    213G  VAL*     3.3    28.9    +      -       -      +
    214G  TRP*     3.4    49.3    +      -       +      +
----------------------------------------------------------
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Residues in contact with TYR 115 (chain G). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    111G  ALA*     3.0    26.7    +      -       +      +
    112G  ARG*     4.1     3.4    -      -       -      +
    114G  CYS*     1.3    75.8    -      -       -      +
    116G  SER*     1.3    66.4    +      -       -      +
    117G  PRO*     3.4     3.5    -      -       -      +
    208G  TYR*     3.5    28.0    -      +       +      -
    209G  THR*     2.7    33.0    +      -       -      +
    211G  VAL*     4.5    15.5    -      -       +      +
    212G  ALA*     3.7    23.3    -      -       +      +
    213G  VAL*     3.2    14.9    +      -       -      +
----------------------------------------------------------
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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