Contacts of the helix formed by residues 71 - 93 (chain C) in PDB entry 1CD9


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 GLN 71 (chain C).
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
      9C  SER*     3.4    15.4    +      -       -      +
     67C  SER*     4.3    10.5    -      -       -      -
     68C  GLN      4.3     0.4    +      -       -      -
     69C  ALA      4.3     1.0    +      -       -      -
     70C  LEU*     1.4    65.6    -      -       -      +
     72C  LEU*     1.3    66.6    +      -       -      +
     73C  ALA*     3.5     6.3    +      -       -      +
    127C  MET*     3.9     5.9    -      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 72 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
      8C  SER*     5.5     4.5    -      -       -      -
      9C  SER*     3.3    19.3    -      -       -      +
     10C  LEU*     3.7    26.0    -      -       +      -
     66C  PRO      4.8     7.6    -      -       -      +
     67C  SER*     4.8     4.7    +      -       -      +
     70C  LEU      2.7    12.6    +      -       -      -
     71C  GLN*     1.3    72.8    -      -       -      +
     73C  ALA*     1.3    64.3    +      -       -      +
     74C  GLY      2.9     4.6    +      -       -      -
     75C  CYS*     3.2    31.2    +      -       +      +
     76C  LEU*     3.3    17.7    +      -       +      +
    127C  MET*     3.8    12.8    -      -       +      -
    172C  LEU*     3.6    41.1    -      -       +      -
----------------------------------------------------------
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Residues in contact with ALA 73 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     70C  LEU*     3.7    13.7    -      -       +      +
     71C  GLN      3.5     4.1    -      -       -      +
     72C  LEU*     1.3    76.3    -      -       -      +
     74C  GLY*     1.3    59.6    +      -       -      +
     76C  LEU*     5.6     0.2    -      -       -      -
     77C  SER*     3.5    17.7    +      -       -      -
    122C  MET*     4.2     4.5    -      -       -      +
    127C  MET*     3.6    49.5    -      -       +      +
----------------------------------------------------------
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Residues in contact with GLY 74 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     68C  GLN*     6.0     3.6    -      -       -      -
     70C  LEU*     3.2    17.4    -      -       -      +
     72C  LEU      2.9     2.0    +      -       -      -
     73C  ALA*     1.3    78.0    -      -       -      +
     75C  CYS*     1.3    59.2    +      -       -      +
     76C  LEU      3.2     2.0    -      -       -      -
     77C  SER*     2.8    28.0    +      -       -      -
     78C  GLN*     3.0    13.4    +      -       -      +
----------------------------------------------------------
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Residues in contact with CYS 75 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     65C  CYS*     2.0    72.3    -      -       +      +
     67C  SER*     5.7     1.8    -      -       -      +
     68C  GLN*     5.8     4.4    -      -       -      +
     70C  LEU*     5.3     1.2    +      -       -      +
     72C  LEU*     3.2    27.5    +      -       +      +
     74C  GLY*     1.3    73.4    -      -       -      +
     76C  LEU*     1.3    65.8    +      -       -      +
     78C  GLN*     3.1     5.9    +      -       -      +
     79C  LEU*     3.0    25.6    +      -       -      +
    168C  VAL*     3.6    16.8    -      -       -      -
    169C  LEU*     6.1     0.7    -      -       -      -
    172C  LEU*     5.3     2.0    -      -       -      -
----------------------------------------------------------
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Residues in contact with LEU 76 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     10C  LEU*     4.0    36.3    -      -       +      -
     14C  PHE*     4.0    26.5    -      -       +      -
     18C  CYS*     6.0     0.4    -      -       -      -
     72C  LEU*     3.3    17.5    +      -       +      +
     73C  ALA*     4.3     0.7    -      -       -      +
     74C  GLY      3.2     0.4    -      -       -      -
     75C  CYS*     1.3    79.8    -      -       +      +
     77C  SER*     1.3    65.3    +      -       -      +
     79C  LEU*     3.1    21.4    +      -       +      +
     80C  HIS*     2.8    24.4    +      -       -      +
    118C  ILE*     4.2     9.0    -      -       +      +
    121C  GLN*     5.3     0.7    -      -       +      -
    122C  MET*     3.5    34.3    -      -       +      +
    127C  MET*     4.7     7.2    -      -       -      -
    169C  LEU*     4.7    10.5    -      -       +      -
    172C  LEU*     5.4     1.3    -      -       +      -
----------------------------------------------------------
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Residues in contact with SER 77 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     73C  ALA      3.5    13.9    +      -       -      -
     74C  GLY*     2.8    19.1    +      -       -      -
     76C  LEU*     1.3    80.1    -      -       -      +
     78C  GLN*     1.3    55.2    +      -       -      +
     80C  HIS*     3.4     4.2    +      -       -      +
     81C  SER*     3.0    31.1    +      -       -      -
    122C  MET*     3.7    10.5    -      -       -      -
    129C  PRO*     2.9    30.5    -      -       -      +
----------------------------------------------------------
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Residues in contact with GLN 78 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     61C  PRO*     3.8    26.0    +      -       -      +
     62C  LEU*     3.8    14.8    -      -       +      -
     63C  SER*     3.0    49.3    +      -       -      +
     65C  CYS*     4.3     7.6    -      -       -      +
     74C  GLY      3.0    15.2    +      -       -      +
     75C  CYS*     3.1     8.7    +      -       -      +
     77C  SER*     1.3    74.6    -      -       -      +
     79C  LEU*     1.3    66.1    +      -       -      +
     80C  HIS      3.1     1.3    -      -       -      -
     81C  SER*     3.1     8.3    +      -       -      +
     82C  GLY*     2.9    22.7    +      -       -      -
    161C  PHE*     4.2     2.3    -      -       -      -
----------------------------------------------------------
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Residues in contact with LEU 79 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     62C  LEU*     4.5     7.3    -      -       +      +
     65C  CYS*     5.8     0.4    -      -       -      -
     75C  CYS*     3.0    16.6    +      -       -      +
     76C  LEU*     3.5    16.4    -      -       +      +
     78C  GLN*     1.3    77.3    -      -       -      +
     80C  HIS*     1.3    63.7    +      -       -      +
     82C  GLY      3.4     0.2    +      -       -      -
     83C  LEU*     3.1    46.0    +      -       +      +
    114C  PHE*     4.7     6.7    -      -       +      -
    118C  ILE*     4.0    17.3    -      -       +      -
    161C  PHE*     3.6    13.4    -      -       +      -
    162C  LEU*     5.6     0.4    -      -       +      -
    165C  SER*     3.2    31.2    -      -       -      +
    168C  VAL*     5.8     2.0    -      -       +      -
    169C  LEU*     4.0    37.0    -      -       +      -
----------------------------------------------------------
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Residues in contact with HIS 80 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     76C  LEU      2.8    12.8    +      -       -      +
     77C  SER*     3.6     9.0    +      -       -      +
     79C  LEU*     1.3    78.2    -      -       -      +
     81C  SER*     1.3    60.8    +      -       -      +
     83C  LEU*     3.8     4.5    -      -       -      +
     84C  PHE*     2.9    44.5    +      +       +      +
    115C  ALA*     3.2    37.3    +      -       +      +
    118C  ILE*     4.1    16.7    -      -       +      +
    119C  TRP*     3.9    34.4    -      +       +      +
    122C  MET*     4.4     5.8    -      -       +      -
    133C  PRO*     3.9    27.2    -      -       +      +
----------------------------------------------------------
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Residues in contact with SER 81 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     61C  PRO*     6.2     2.9    -      -       -      -
     77C  SER*     3.0    19.8    +      -       -      -
     78C  GLN*     3.1     9.8    +      -       -      -
     80C  HIS*     1.3    81.3    +      -       -      +
     82C  GLY*     1.3    64.4    +      -       -      +
     84C  PHE*     3.2     8.9    +      -       -      +
     85C  LEU*     2.9    23.1    +      -       -      +
    133C  PRO*     5.0     8.6    -      -       -      +
----------------------------------------------------------
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Residues in contact with GLY 82 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     60C  ALA*     3.9    17.7    -      -       -      -
     61C  PRO*     5.4     4.2    +      -       -      +
     78C  GLN      2.9    11.4    +      -       -      -
     81C  SER*     1.3    75.3    -      -       -      +
     83C  LEU*     1.3    55.1    +      -       -      +
     85C  LEU*     2.7    26.0    +      -       -      +
     86C  TYR*     3.0    15.9    +      -       -      -
    161C  PHE*     3.5    21.8    -      -       -      -
----------------------------------------------------------
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Residues in contact with LEU 83 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     25C  ILE*     5.1     2.5    -      -       +      -
     79C  LEU*     3.1    20.7    +      -       +      +
     80C  HIS*     3.8     3.8    -      -       -      +
     82C  GLY*     1.3    72.2    -      -       -      +
     84C  PHE*     1.3    58.0    +      -       -      +
     86C  TYR*     3.4     3.3    +      -       -      +
     87C  GLN*     2.9    30.0    +      -       -      +
    111C  VAL*     3.4    21.4    -      -       +      +
    114C  PHE*     3.3    41.3    -      -       +      -
    115C  ALA*     4.0    19.7    -      -       +      +
    118C  ILE*     4.0    15.7    -      -       +      -
    158C  LEU*     4.7     5.4    -      -       +      -
    161C  PHE*     3.6    19.4    -      -       +      -
    162C  LEU*     4.0    20.9    -      -       +      -
----------------------------------------------------------
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Residues in contact with PHE 84 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     80C  HIS*     2.9    37.1    +      +       +      +
     81C  SER*     3.3     8.5    -      -       -      +
     83C  LEU*     1.3    79.4    -      -       -      +
     85C  LEU*     1.3    61.1    +      -       -      +
     87C  GLN*     3.1    42.7    -      -       -      +
     88C  GLY      3.2     4.7    +      -       -      -
    115C  ALA*     4.5     2.0    -      -       +      +
    133C  PRO*     3.6    42.4    -      -       +      -
    134C  THR      4.6     0.9    -      -       -      -
    135C  GLN*     3.6    42.3    +      -       +      -
----------------------------------------------------------
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Residues in contact with LEU 85 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     58C  PRO*     3.9    28.5    -      -       +      +
     59C  TRP      4.9     0.7    -      -       -      +
     60C  ALA*     4.2    27.4    -      -       +      +
     61C  PRO*     5.3     3.6    -      -       +      -
     81C  SER      2.9    11.1    +      -       -      +
     82C  GLY*     2.7    16.6    +      -       -      +
     84C  PHE*     1.3    69.4    -      -       -      +
     86C  TYR*     1.3    62.9    +      -       +      +
     87C  GLN      3.0     1.1    -      -       -      -
     88C  GLY*     2.9     4.2    +      -       -      -
     89C  LEU*     2.8    35.3    +      -       +      +
    135C  GLN*     4.1    10.3    -      -       -      +
    136C  GLY*     5.8     1.3    -      -       -      +
    138C  MET*     3.7    26.2    -      -       +      +
----------------------------------------------------------
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Residues in contact with TYR 86 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     58C  PRO      4.6     3.4    -      -       -      -
     59C  TRP*     4.1     0.7    -      -       -      -
     60C  ALA*     3.0    47.1    +      -       +      +
     82C  GLY      3.0    19.9    +      -       -      -
     83C  LEU      4.0     5.2    -      -       -      +
     85C  LEU*     1.3    78.4    -      -       +      +
     87C  GLN*     1.3    66.6    +      -       -      +
     89C  LEU*     3.9    24.9    -      -       +      -
     90C  LEU*     2.9    37.0    +      -       +      +
    111C  VAL*     4.8     2.7    -      -       +      -
    154C  VAL*     4.0    12.8    -      -       +      -
    157C  HIS*     3.3    41.8    +      -       +      +
    158C  LEU*     3.4    33.0    -      -       +      -
    161C  PHE*     3.8    20.8    -      +       +      +
----------------------------------------------------------
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Residues in contact with GLN 87 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     83C  LEU      2.9    13.4    +      -       -      +
     84C  PHE*     3.1    37.1    -      -       -      +
     86C  TYR*     1.3    77.4    -      -       -      +
     88C  GLY*     1.3    60.6    +      -       -      +
     90C  LEU*     3.8     2.1    +      -       -      +
     91C  GLN*     3.3    27.3    +      -       -      +
    108C  GLN*     3.1    39.4    +      -       -      +
    111C  VAL*     4.1     9.4    -      -       +      +
    112C  ALA*     3.6    31.2    +      -       -      +
    115C  ALA*     4.0    13.7    -      -       -      +
    116C  THR*     5.6     0.6    +      -       -      -
    135C  GLN*     6.1     0.2    -      -       -      -
----------------------------------------------------------
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Residues in contact with GLY 88 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     84C  PHE      3.2     3.2    +      -       -      -
     85C  LEU      2.9     7.1    +      -       -      -
     87C  GLN*     1.3    79.6    -      -       -      +
     89C  LEU*     1.3    65.8    +      -       -      +
     91C  GLN*     2.8    19.8    +      -       -      +
     92C  ALA*     2.9    13.2    +      -       -      +
    135C  GLN*     3.9    18.8    -      -       -      +
    138C  MET*     3.8    12.8    -      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 89 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     57C  ILE*     4.2    21.1    -      -       +      -
     58C  PRO*     4.2    20.2    -      -       +      +
     85C  LEU*     2.8    25.9    +      -       +      +
     86C  TYR*     3.4    31.2    +      -       +      +
     88C  GLY*     1.3    70.3    -      -       -      +
     90C  LEU*     1.3    62.6    +      -       -      +
     92C  ALA*     3.0    16.8    +      -       -      +
     93C  LEU*     3.4    15.7    +      -       -      +
    138C  MET*     3.9    11.8    -      -       +      -
    139C  PRO*     3.6    37.5    -      -       +      -
    141C  PHE*     4.1     5.4    -      -       +      -
    154C  VAL*     4.0    17.9    -      -       +      -
----------------------------------------------------------
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Residues in contact with LEU 90 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     32C  LEU*     4.9     3.8    -      -       +      -
     86C  TYR      2.9    28.2    +      -       -      +
     87C  GLN*     4.1     3.6    -      -       -      +
     89C  LEU*     1.3    76.2    -      -       -      +
     91C  GLN*     1.3    60.4    +      -       -      +
     93C  LEU*     3.5    23.2    +      -       +      +
     94C  GLU      4.4     0.9    +      -       -      -
     95C  GLY      5.0     0.5    +      -       -      -
    104C  LEU*     3.9    34.4    -      -       +      +
    107C  LEU*     3.9    33.0    -      -       +      -
    108C  GLN*     4.2    21.4    -      -       +      +
    111C  VAL*     4.0    20.6    -      -       +      -
    151C  GLY      5.9     0.2    -      -       -      +
    154C  VAL*     3.6    27.6    -      -       +      -
    155C  ALA      5.2     0.4    -      -       -      +
    158C  LEU*     4.5     6.3    -      -       +      -
----------------------------------------------------------
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Residues in contact with GLN 91 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     87C  GLN*     3.3    29.8    +      -       -      +
     88C  GLY*     2.8    13.9    +      -       -      +
     90C  LEU*     1.3    79.1    -      -       -      +
     92C  ALA*     1.3    62.1    +      -       -      +
     94C  GLU*     3.1    20.1    +      -       -      +
    108C  GLN*     3.6    31.2    +      -       +      +
----------------------------------------------------------
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Residues in contact with ALA 92 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     88C  GLY      2.9    10.2    +      -       -      +
     89C  LEU*     3.0    12.1    +      -       -      +
     91C  GLN*     1.3    73.2    -      -       -      +
     93C  LEU*     1.3    56.0    +      -       -      +
     94C  GLU*     2.9    33.0    +      -       -      +
    138C  MET*     4.9    11.4    -      -       +      -
    139C  PRO*     3.7    11.4    -      -       +      +
    140C  ALA*     5.7     0.2    -      -       -      -
    141C  PHE*     3.5    33.0    +      -       +      +
----------------------------------------------------------
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Residues in contact with LEU 93 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     89C  LEU      3.7    10.1    -      -       -      +
     90C  LEU*     3.6    27.8    -      -       +      +
     91C  GLN      3.2     0.6    -      -       -      -
     92C  ALA*     1.3    75.1    -      -       -      +
     94C  GLU*     1.3    53.9    +      -       -      +
     95C  GLY      3.1     0.9    -      -       -      -
     96C  ILE*     2.6    50.4    +      -       +      -
    104C  LEU*     4.1    11.2    -      -       +      -
    141C  PHE*     3.8    28.0    -      -       +      -
    147C  ARG*     3.4    32.6    -      -       -      +
    150C  GLY      3.9     7.2    -      -       -      +
    151C  GLY*     3.5    31.2    -      -       -      +
    154C  VAL*     4.5     4.0    -      -       +      -
----------------------------------------------------------
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A short description of the analytical approach
The contact analysis used in this page is based upon the approach developed in: Sobolev V., Wade R.C., Vriend G. and Edelman M. PROTEINS (1996) 25, 120-129. Contact legitimacy depends on the hydrophobic-hydrophilic properties of the contacting atoms. In order to define it, for each inter-atomic contact, eight atom classes have been introduced:


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

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

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