Contacts of the helix formed by residues 29 - 55 (chain G) in PDB entry 3EXE


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 ARG 29 (chain G).
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
      1G  PHE*     3.5    26.3    -      -       -      +
      2G  ALA      3.7    24.2    -      -       -      +
      3G  ASN*     2.9    21.8    +      -       -      +
      4G  ASP*     4.3     1.0    -      -       -      +
     27G  LEU      3.9     0.2    +      -       -      -
     28G  THR*     1.3    70.8    -      -       -      +
     30G  GLU*     1.3    64.2    +      -       -      +
     32G  GLY*     3.4     1.4    +      -       -      -
     33G  LEU*     3.1    43.4    +      -       +      +
    295G  MET*     5.0     0.7    -      -       -      +
    300G  LEU*     2.7    50.4    +      -       +      +
    301G  ALA*     3.6     2.6    -      -       -      +
    305G  GLU*     2.8    41.2    +      -       -      -
----------------------------------------------------------
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Residues in contact with GLU 30 (chain G). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     28G  THR*     3.3     8.2    +      -       -      +
     29G  ARG*     1.3    81.2    -      -       -      +
     31G  ASP*     1.3    82.9    +      -       -      +
     33G  LEU*     3.4     8.5    +      -       -      +
     34G  LYS*     3.0    29.8    +      -       +      +
----------------------------------------------------------
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Residues in contact with ASP 31 (chain G). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     27G  LEU*     3.7    15.3    -      -       +      -
     28G  THR*     2.9    25.5    +      -       -      +
     30G  GLU*     1.3    93.6    -      -       -      +
     32G  GLY*     1.3    60.4    +      -       -      +
     34G  LYS*     3.2    12.8    +      -       -      +
     35G  TYR*     2.9    57.2    +      -       +      -
    234G  ARG*     3.8     8.3    +      -       -      -
    238G  ARG*     5.2     2.9    +      -       -      -
----------------------------------------------------------
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Residues in contact with GLY 32 (chain G). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     27G  LEU*     3.4    15.3    -      -       -      +
     28G  THR      2.8    19.3    +      -       -      -
     29G  ARG      3.8     0.4    -      -       -      -
     31G  ASP*     1.3    72.3    -      -       -      +
     33G  LEU*     1.3    55.3    +      -       -      +
     35G  TYR*     3.3     5.6    +      -       -      +
     36G  TYR*     2.8    32.2    +      -       -      +
    291G  LEU*     3.8     1.7    -      -       -      +
    295G  MET*     3.4    28.3    -      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 33 (chain G). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     29G  ARG*     3.1    56.0    +      -       +      +
     30G  GLU*     3.9     7.0    -      -       -      +
     32G  GLY*     1.3    75.7    -      -       -      +
     34G  LYS*     1.3    61.4    +      -       -      +
     36G  TYR*     3.8     3.9    -      -       -      +
     37G  ARG*     3.1    25.6    +      -       -      +
    295G  MET*     5.1     1.8    -      -       -      -
    300G  LEU      5.1     0.2    -      -       -      +
    301G  ALA*     4.0    25.8    -      -       +      -
    305G  GLU*     4.5     9.4    -      -       +      +
    306G  LEU*     4.1     7.0    -      -       +      -
    309G  ILE*     3.8    26.9    -      -       +      +
----------------------------------------------------------
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Residues in contact with LYS 34 (chain G). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     30G  GLU*     3.0    23.4    +      -       +      +
     31G  ASP*     3.4    13.4    +      -       -      +
     33G  LEU*     1.3    75.3    -      -       -      +
     35G  TYR*     1.3    79.6    +      -       +      +
     37G  ARG*     3.4     5.6    +      -       -      +
     38G  MET*     3.0    51.1    +      -       +      +
----------------------------------------------------------
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Residues in contact with TYR 35 (chain G). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     27G  LEU*     3.7    19.3    -      -       +      -
     31G  ASP*     2.9    40.2    +      -       +      +
     32G  GLY*     3.8     4.3    -      -       -      +
     34G  LYS*     1.3    87.1    -      -       +      +
     36G  TYR*     1.3    67.4    -      -       -      +
     38G  MET*     3.2     4.6    +      -       -      +
     39G  MET*     2.9    29.7    +      -       +      +
     73G  VAL*     4.1    13.0    -      -       +      +
     77G  ALA*     3.5    25.4    +      -       +      +
    230G  ILE*     3.6    32.3    -      -       +      -
    231G  LEU*     4.4     5.4    -      -       +      -
    234G  ARG*     2.9    40.8    +      -       -      -
    238G  ARG*     4.4     4.2    +      -       -      -
    291G  LEU*     3.9    12.3    -      -       +      -
----------------------------------------------------------
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Residues in contact with TYR 36 (chain G). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     32G  GLY      2.8    17.9    +      -       -      +
     33G  LEU*     3.8     6.1    -      -       -      +
     35G  TYR*     1.3    76.6    -      -       -      +
     37G  ARG*     1.3    64.9    +      -       -      +
     39G  MET*     3.9     2.9    -      -       -      +
     40G  GLN*     2.9    33.4    +      -       +      +
    288G  ILE*     3.6    33.3    -      -       +      +
    291G  LEU*     3.5    10.9    -      -       +      +
    292G  LYS*     3.9    27.8    -      -       +      +
    295G  MET*     3.8    15.7    -      -       +      -
    306G  LEU*     3.7    40.1    +      -       +      +
    309G  ILE*     3.9    17.0    -      -       +      -
    310G  ASP*     2.5    37.4    +      -       -      -
----------------------------------------------------------
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Residues in contact with ARG 37 (chain G). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     33G  LEU      3.1    15.7    +      -       -      +
     34G  LYS*     3.9     4.9    -      -       -      +
     36G  TYR*     1.3    80.6    -      -       -      +
     38G  MET*     1.3    59.1    +      -       +      +
     40G  GLN*     3.9     1.8    -      -       -      +
     41G  THR*     2.8    38.8    +      -       -      +
    309G  ILE*     3.7    45.2    -      -       +      +
    312G  GLU*     3.0    39.6    +      -       -      +
    313G  VAL*     4.0    12.6    -      -       +      +
----------------------------------------------------------
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Residues in contact with MET 38 (chain G). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     34G  LYS*     3.0    49.6    +      -       +      +
     35G  TYR*     3.2     7.4    +      -       -      +
     37G  ARG*     1.3    78.5    -      -       +      +
     39G  MET*     1.3    63.3    +      -       -      +
     41G  THR*     3.3     3.5    +      -       -      -
     42G  VAL*     3.1    27.2    +      -       -      +
     73G  VAL*     3.9    24.0    -      -       +      +
     76G  GLU*     4.6    15.0    -      -       +      -
     96G  PHE*     3.9    19.6    -      -       +      -
     97G  THR*     3.7    35.2    -      -       +      +
----------------------------------------------------------
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Residues in contact with MET 39 (chain G). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     35G  TYR      2.9    14.1    +      -       -      +
     36G  TYR*     4.0     3.4    -      -       +      +
     38G  MET*     1.3    76.9    -      -       -      +
     40G  GLN*     1.3    57.6    +      -       -      +
     42G  VAL      3.3     1.6    +      -       -      -
     43G  ARG*     2.9    28.2    +      -       -      +
     69G  GLU*     3.5    27.4    -      -       +      +
     70G  ALA      4.0     1.3    -      -       -      -
     73G  VAL*     3.5    25.1    -      -       +      +
    230G  ILE*     4.0    21.5    -      -       +      -
    287G  PRO*     3.9    41.1    -      -       -      +
    288G  ILE*     3.7    16.6    -      -       +      -
    291G  LEU*     3.3    36.3    -      -       +      -
----------------------------------------------------------
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Residues in contact with GLN 40 (chain G). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     36G  TYR*     2.9    26.5    +      -       +      +
     37G  ARG*     3.9     3.6    -      -       -      +
     39G  MET*     1.3    78.5    -      -       -      +
     41G  THR*     1.3    56.1    +      -       -      +
     43G  ARG*     3.3     7.8    +      -       -      +
     44G  ARG*     2.9    59.4    +      -       +      +
    288G  ILE*     3.6    33.9    -      -       +      +
    310G  ASP*     3.7    31.7    +      -       -      +
    313G  VAL*     3.8    23.1    -      -       +      -
    314G  ARG*     5.4     1.8    +      -       -      +
----------------------------------------------------------
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Residues in contact with THR 41 (chain G). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     37G  ARG*     2.8    27.3    +      -       -      +
     38G  MET      3.3     5.1    +      -       -      -
     40G  GLN*     1.3    74.9    -      -       -      +
     42G  VAL*     1.3    58.3    +      -       -      +
     44G  ARG*     3.8     1.0    -      -       -      +
     45G  MET*     2.8    33.9    +      -       +      +
     96G  PHE*     3.6    26.1    -      -       +      -
    102G  VAL*     3.6    29.6    -      -       +      -
    313G  VAL*     3.4    22.6    -      -       -      +
    316G  GLU*     3.8    15.2    +      -       -      +
    317G  ILE*     4.1     3.4    -      -       +      +
----------------------------------------------------------
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Residues in contact with VAL 42 (chain G). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     38G  MET      3.1    19.5    +      -       -      +
     39G  MET      3.7     6.7    -      -       -      +
     41G  THR*     1.3    76.4    -      -       -      +
     43G  ARG*     1.3    62.3    +      -       -      +
     45G  MET*     3.3     9.0    +      -       +      +
     46G  GLU*     3.0    26.1    +      -       +      +
     65G  CYS*     3.6    31.9    -      -       -      -
     69G  GLU*     3.8    13.7    -      -       +      +
     72G  CYS*     4.2    12.6    -      -       -      -
     73G  VAL*     4.7     1.6    -      -       +      -
     93G  GLY*     3.7    22.7    -      -       -      +
     96G  PHE*     3.7    23.1    -      -       +      -
     97G  THR*     4.6     2.5    -      -       +      -
----------------------------------------------------------
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Residues in contact with ARG 43 (chain G). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     39G  MET      2.9    15.8    +      -       -      +
     40G  GLN*     3.5    14.8    -      -       -      +
     42G  VAL*     1.3    75.9    -      -       -      +
     44G  ARG*     1.3    58.7    +      -       -      +
     46G  GLU*     3.4     3.5    +      -       -      +
     47G  LEU*     3.0    53.0    +      -       +      +
     66G  ASP*     3.6    15.9    -      -       -      +
     67G  GLY      3.7     0.6    -      -       -      +
     69G  GLU*     2.9    44.6    +      -       -      +
    260G  TYR*     3.6    14.4    -      -       -      -
    282G  ARG*     3.8    18.7    -      -       -      +
    286G  ASP*     2.8    35.4    +      -       -      -
    287G  PRO*     3.8     7.5    -      -       -      +
    288G  ILE*     3.5    22.0    -      -       +      +
----------------------------------------------------------
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Residues in contact with ARG 44 (chain G). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     40G  GLN*     2.9    43.5    +      -       -      +
     41G  THR      4.1     1.3    -      -       -      +
     43G  ARG*     1.3    73.6    -      -       -      +
     45G  MET*     1.3    60.4    +      -       -      +
     47G  LEU*     3.4    36.6    +      -       -      +
     48G  LYS*     2.9    31.0    +      -       -      +
    313G  VAL*     3.8    14.8    -      -       +      -
    314G  ARG*     3.2    62.3    -      -       +      +
    317G  ILE*     3.8    23.1    -      -       +      +
----------------------------------------------------------
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Residues in contact with MET 45 (chain G). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     41G  THR      2.8    20.7    +      -       -      +
     42G  VAL*     4.2    17.7    -      -       +      +
     44G  ARG*     1.3    77.9    -      -       -      +
     46G  GLU*     1.3    60.4    +      -       -      +
     48G  LYS*     3.4     5.7    +      -       -      +
     49G  ALA*     3.0    25.9    +      -       +      +
     92G  HIS*     3.4    38.4    -      -       +      +
     93G  GLY*     4.2     2.2    -      -       -      +
     96G  PHE*     4.2    12.6    -      -       +      -
    102G  VAL*     4.3    19.1    -      -       +      -
    105G  ILE*     3.7    34.8    -      -       +      -
    106G  LEU*     3.9    18.9    -      -       +      +
    109G  LEU*     5.9     1.1    -      -       +      -
    317G  ILE*     3.7    14.5    -      -       +      +
----------------------------------------------------------
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Residues in contact with GLU 46 (chain G). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     42G  VAL*     3.0    20.1    +      -       +      +
     43G  ARG      3.8     3.6    -      -       -      +
     44G  ARG      3.3     0.2    -      -       -      -
     45G  MET*     1.3    79.9    -      -       +      +
     47G  LEU*     1.3    60.3    +      -       -      +
     49G  ALA*     3.2     4.9    +      -       -      +
     50G  ASP      3.0    23.6    +      -       -      -
     63G  HIS      3.9     0.7    -      -       -      +
     64G  LEU*     3.2    25.3    -      -       +      +
     65G  CYS*     2.8    47.1    +      -       -      +
     66G  ASP*     4.2    22.2    -      -       +      +
     92G  HIS*     2.6    42.7    +      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 47 (chain G). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     43G  ARG*     3.0    38.2    +      -       +      +
     44G  ARG*     3.4    44.6    -      -       -      +
     46G  GLU*     1.3    75.7    -      -       -      +
     48G  LYS*     1.3    60.3    +      -       -      +
     50G  ASP*     3.5     7.4    +      -       +      +
     51G  GLN*     3.3    19.8    +      -       -      +
     66G  ASP*     3.9    22.0    -      -       -      +
    261G  HIS*     4.0    14.1    -      -       +      -
    282G  ARG*     6.3     0.7    -      -       -      +
----------------------------------------------------------
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Residues in contact with LYS 48 (chain G). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     44G  ARG      2.9    18.2    +      -       -      +
     45G  MET*     3.6     5.2    -      -       -      +
     47G  LEU*     1.3    74.5    -      -       -      +
     49G  ALA*     1.3    59.7    +      -       -      +
     51G  GLN*     2.8    34.3    +      -       -      +
     52G  LEU*     2.9    36.4    +      -       +      +
    106G  LEU*     4.0    10.8    -      -       +      -
    317G  ILE*     3.4    20.4    -      -       +      -
    318G  GLU*     2.8    36.1    +      -       -      -
    321G  ALA*     3.4    34.6    -      -       +      +
----------------------------------------------------------
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Residues in contact with ALA 49 (chain G). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     45G  MET      3.0    14.8    +      -       -      +
     46G  GLU*     3.6    10.8    -      -       -      +
     48G  LYS*     1.3    72.9    -      -       -      +
     50G  ASP*     1.3    67.8    +      -       -      +
     52G  LEU*     4.3     2.9    -      -       -      +
     53G  TYR*     2.9    26.3    +      -       -      +
     58G  ILE*     3.6    24.0    -      -       +      +
     62G  CYS*     4.3     5.3    -      -       -      -
     64G  LEU*     4.0    16.4    -      -       +      -
    106G  LEU*     4.6     2.2    -      -       +      -
    109G  LEU*     4.2    15.0    -      -       +      -
----------------------------------------------------------
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Residues in contact with ASP 50 (chain G). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     46G  GLU      3.0    13.3    +      -       -      +
     47G  LEU*     3.5    12.1    -      -       +      +
     49G  ALA*     1.3    76.6    -      -       -      +
     51G  GLN*     1.3    63.8    +      -       -      +
     53G  TYR*     3.3     2.1    +      -       -      +
     54G  LYS*     2.7    59.2    +      -       -      +
     64G  LEU*     3.8     9.3    -      -       +      +
    261G  HIS*     2.6    33.8    +      -       +      +
    265G  MET*     3.6    21.2    -      -       -      +
----------------------------------------------------------
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Residues in contact with GLN 51 (chain G). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     47G  LEU      3.3    10.0    +      -       -      +
     48G  LYS*     2.8    44.7    +      -       -      +
     50G  ASP*     1.3    83.2    +      -       -      +
     52G  LEU*     1.3    63.9    +      -       -      +
     54G  LYS*     3.4     7.2    +      -       -      +
     55G  GLN*     3.1    46.4    +      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 52 (chain G). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     48G  LYS*     2.9    46.3    +      -       +      +
     51G  GLN*     1.3    74.5    -      -       -      +
     53G  TYR*     1.3    60.9    +      -       -      +
     55G  GLN*     3.2    12.3    +      -       -      +
     56G  LYS      3.1     4.3    +      -       -      -
     57G  ILE*     2.9    46.5    +      -       +      +
     58G  ILE*     3.6    28.9    -      -       +      -
    106G  LEU*     4.3    20.4    -      -       +      -
    110G  THR*     4.0    14.1    -      -       +      -
    321G  ALA*     4.5     7.2    -      -       +      -
    324G  ALA*     5.2     0.2    -      -       +      -
    325G  THR*     3.7    23.1    -      -       -      +
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Residues in contact with TYR 53 (chain G). Click here for Legend to table.
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                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
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     49G  ALA      2.9    18.4    +      -       -      +
     50G  ASP      3.6     4.0    -      -       -      +
     52G  LEU*     1.3    76.6    -      -       -      +
     54G  LYS*     1.3    60.4    +      -       +      +
     56G  LYS*     2.9    22.5    +      -       -      +
     58G  ILE*     3.3    34.4    -      -       +      +
     59G  ARG*     3.7    11.8    -      -       -      -
     60G  GLY*     2.8    33.7    +      -       -      -
     62G  CYS*     3.7    23.8    -      -       +      -
    265G  MET*     3.4    42.9    -      -       +      +
    266G  SER*     5.4     4.2    +      -       -      -
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Residues in contact with LYS 54 (chain G). Click here for Legend to table.
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                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
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     50G  ASP*     2.7    44.4    +      -       -      +
     51G  GLN*     3.8     7.2    -      -       -      +
     53G  TYR*     1.3    80.0    -      -       +      +
     55G  GLN*     1.3    62.1    +      -       +      +
     56G  LYS*     3.2     9.8    +      -       -      +
    265G  MET*     4.0    13.9    -      -       +      -
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Residues in contact with GLN 55 (chain G). Click here for Legend to table.
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                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
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     51G  GLN*     3.1    45.0    +      -       +      +
     52G  LEU*     3.7    11.5    -      -       -      +
     53G  TYR      3.1     0.6    -      -       -      -
     54G  LYS*     1.3    77.2    -      -       +      +
     56G  LYS*     1.3    68.4    +      -       -      +
     57G  ILE*     3.1    32.0    +      -       +      +
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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
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  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) +   -    +    +   +   +    +    -
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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