Contacts of the helix formed by residues 902 - 926 (chain C) in PDB entry 3U3F


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 PRO 902 (chain C).
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    900A  GLN      4.0    15.3    -      -       -      +
    901A  LEU*     4.3     1.6    -      -       +      -
    902A  PRO*     3.8    17.9    -      -       +      -
    900C  GLN      4.4     0.2    -      -       -      +
    901C  LEU*     1.3   101.7    -      -       +      +
    903C  PRO*     1.3    67.9    -      -       +      +
    904C  GLU*     3.6    16.6    -      -       -      +
    905C  GLY*     2.8    28.2    +      -       -      +
    906C  TYR*     3.3    12.3    +      -       -      -
----------------------------------------------------------
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Residues in contact with PRO 903 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    901C  LEU      4.7     0.2    -      -       -      +
    902C  PRO*     1.3    83.6    -      -       +      +
    904C  GLU*     1.3    74.1    +      -       -      +
    906C  TYR*     3.1    35.4    +      -       +      +
    961C  GLN*     2.9    31.0    +      -       +      +
    964C  ALA*     3.5    32.1    -      -       +      -
----------------------------------------------------------
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Residues in contact with GLU 904 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    897A  GLU*     6.5     0.4    -      -       +      -
    900A  GLN*     4.1    44.5    -      -       +      +
    901A  LEU*     5.0     2.2    -      -       +      -
    902C  PRO*     3.6    21.7    -      -       -      +
    903C  PRO*     1.3    80.2    -      -       -      +
    905C  GLY*     1.3    62.0    +      -       -      +
    906C  TYR      3.1     1.4    +      -       -      -
    907C  VAL*     3.3    21.2    +      -       -      +
    908C  VAL*     4.2     4.3    +      -       -      +
    961C  GLN*     4.5     3.8    -      -       -      +
----------------------------------------------------------
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Residues in contact with GLY 905 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    901A  LEU*     3.8    24.3    -      -       -      +
    901C  LEU*     3.7    13.8    -      -       -      +
    902C  PRO      2.8    11.6    +      -       -      -
    904C  GLU*     1.3    78.1    -      -       -      +
    906C  TYR*     1.3    63.5    +      -       -      +
    907C  VAL      3.0     1.0    +      -       -      -
    908C  VAL*     3.2    18.8    +      -       -      +
    909C  VAL*     3.3    15.6    +      -       -      +
----------------------------------------------------------
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Residues in contact with TYR 906 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    898C  LEU*     3.6    36.6    +      -       +      +
    901C  LEU*     3.8    26.7    +      -       +      -
    902C  PRO      3.3     4.4    +      -       -      -
    903C  PRO*     3.1    44.6    +      -       +      +
    905C  GLY*     1.3    77.7    -      -       -      +
    907C  VAL*     1.3    62.4    +      -       -      +
    909C  VAL*     3.6     7.3    +      -       -      +
    910C  VAL*     3.2    28.4    +      -       -      +
    957C  MET*     3.9    18.6    -      -       +      -
    960C  ALA*     4.1    25.1    -      -       +      -
    961C  GLN*     4.2    15.0    -      -       +      +
    964C  ALA*     5.2     2.1    -      -       +      +
    969C  SER*     5.0     3.6    +      -       -      -
    973C  LYS*     3.7    22.4    -      -       +      +
    976C  MET*     4.8     5.1    -      -       -      +
----------------------------------------------------------
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Residues in contact with VAL 907 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    904C  GLU*     3.4    11.9    -      -       -      +
    905C  GLY      3.0     0.2    -      -       -      -
    906C  TYR*     1.3    74.7    -      -       -      +
    908C  VAL*     1.3    58.4    +      -       +      +
    910C  VAL*     3.1     3.6    +      -       -      +
    911C  LYS*     2.6    42.9    +      -       +      +
    957C  MET*     4.0    22.2    -      -       +      +
    958C  ARG*     4.5     8.7    -      -       -      +
    961C  GLN*     3.4    29.2    -      -       -      +
    273G  SER      6.0     2.2    -      -       -      +
----------------------------------------------------------
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Residues in contact with VAL 908 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    893A  GLU*     5.8     2.5    -      -       -      +
    897A  GLU*     3.6    32.1    -      -       -      +
    901A  LEU*     4.9     4.7    -      -       +      -
    908A  VAL*     3.6    27.4    -      -       +      -
    909A  VAL*     3.9    16.4    -      -       +      +
    912A  ASN*     3.3    18.1    -      -       -      +
    901C  LEU*     6.3     0.2    -      -       +      -
    904C  GLU      4.9     6.3    -      -       -      +
    905C  GLY*     3.2    13.4    +      -       -      +
    907C  VAL*     1.3    81.6    -      -       +      +
    909C  VAL*     1.3    63.3    +      -       -      +
    911C  LYS*     3.0    12.4    +      -       +      +
    912C  ASN*     2.9    25.6    +      -       -      -
----------------------------------------------------------
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Residues in contact with VAL 909 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    908A  VAL*     4.9     6.1    -      -       +      -
    890C  ALA      5.3     0.4    -      -       -      +
    894C  LEU*     3.4    46.4    -      -       +      -
    897C  GLU*     3.8    18.8    -      -       +      +
    898C  LEU*     5.5     3.8    -      -       +      -
    901C  LEU*     3.2    35.4    -      -       +      -
    905C  GLY      3.4     5.2    -      -       -      +
    906C  TYR*     3.7     8.1    -      -       -      +
    907C  VAL      3.2     0.2    -      -       -      -
    908C  VAL*     1.3    76.3    -      -       -      +
    910C  VAL*     1.3    63.0    +      -       -      +
    912C  ASN*     2.9    25.4    +      -       +      +
    913C  VAL*     3.0    12.6    +      -       +      +
----------------------------------------------------------
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Residues in contact with VAL 910 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    894C  LEU*     4.2     8.5    -      -       +      -
    906C  TYR      3.2    14.8    +      -       -      +
    907C  VAL      3.1     7.4    +      -       -      +
    909C  VAL*     1.3    79.0    -      -       -      +
    911C  LYS*     1.3    65.6    +      -       -      +
    913C  VAL*     3.1     9.7    +      -       -      +
    914C  GLY*     2.9    19.2    +      -       -      -
    950C  LEU*     4.6     3.8    -      -       +      +
    953C  LEU*     4.0    22.9    -      -       +      -
    954C  ILE*     4.3    17.3    -      -       +      -
    957C  MET*     3.6    24.7    -      -       +      -
    976C  MET*     3.6    29.4    -      -       +      -
    271G  MET*     4.7     0.7    -      -       -      +
----------------------------------------------------------
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Residues in contact with LYS 911 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    890A  ALA*     5.1     5.7    -      -       -      +
    893A  GLU*     2.6    42.7    +      -       -      +
    912A  ASN*     4.0    18.6    +      -       -      +
    916A  THR*     5.9     3.9    -      -       -      +
    907C  VAL*     2.6    21.2    +      -       +      +
    908C  VAL*     3.0    18.2    -      -       +      +
    910C  VAL*     1.3    77.9    -      -       -      +
    912C  ASN*     1.3    54.6    +      -       -      +
    914C  GLY      3.1     1.7    +      -       -      -
    915C  LEU*     2.9    37.2    +      -       +      +
    271G  MET*     3.2    29.4    -      -       +      +
----------------------------------------------------------
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Residues in contact with ASN 912 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    908A  VAL*     3.5    23.7    +      -       -      +
    911A  LYS*     3.6    27.6    -      -       -      +
    912A  ASN*     3.2    24.2    +      -       -      +
    915A  LEU*     3.9     8.9    -      -       +      +
    890C  ALA*     5.1     4.3    -      -       +      -
    908C  VAL*     2.9    31.9    +      -       -      +
    909C  VAL*     2.9    10.9    +      -       +      +
    911C  LYS*     1.3    73.6    -      -       -      +
    913C  VAL*     1.3    64.6    +      -       +      +
    915C  LEU*     3.3     3.6    +      -       -      +
    916C  THR*     2.9    34.4    +      -       +      +
----------------------------------------------------------
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Residues in contact with VAL 913 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    887C  LEU*     4.6     5.4    -      -       +      +
    890C  ALA*     3.8    28.9    -      -       +      +
    891C  VAL*     4.4    13.0    -      -       +      +
    894C  LEU*     3.9    21.8    -      -       +      -
    909C  VAL*     3.0    13.4    +      -       +      +
    910C  VAL*     3.1     8.9    +      -       -      +
    912C  ASN*     1.3    76.7    -      -       +      +
    914C  GLY*     1.3    62.3    +      -       -      +
    916C  THR*     3.4     7.6    +      -       -      -
    917C  LEU*     3.1    22.0    +      -       -      +
    950C  LEU*     5.0     1.8    -      -       +      -
    953C  LEU*     4.0    10.5    -      -       +      -
    980C  SER*     6.2     0.2    -      -       -      -
    983C  LEU*     3.6    31.2    -      -       +      -
----------------------------------------------------------
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Residues in contact with GLY 914 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    910C  VAL      2.9    12.5    +      -       -      -
    911C  LYS      3.4     4.0    -      -       -      -
    913C  VAL*     1.3    75.5    -      -       -      +
    915C  LEU*     1.3    65.9    +      -       -      +
    917C  LEU*     2.9     5.2    +      -       -      +
    918C  ARG*     2.9    22.7    +      -       -      +
    950C  LEU*     4.2    18.6    -      -       -      +
    267G  LEU*     4.7     1.9    -      -       -      +
    271G  MET*     3.6    24.2    -      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 915 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    886A  GLU*     4.8     3.1    -      -       -      +
    912A  ASN*     3.2    37.2    -      -       +      +
    915A  LEU*     4.2    19.6    -      -       +      +
    916A  THR*     3.6    38.1    -      -       +      +
    919A  LYS*     4.4    18.2    -      -       +      -
    911C  LYS*     2.9    25.2    +      -       +      +
    912C  ASN*     3.3     4.2    +      -       -      +
    914C  GLY*     1.3    72.8    -      -       -      +
    916C  THR*     1.3    58.1    +      -       -      +
    918C  ARG*     3.2    13.6    +      -       -      +
    919C  LYS*     3.0    24.1    +      -       -      +
    271G  MET*     3.7    12.7    -      -       +      +
----------------------------------------------------------
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Residues in contact with THR 916 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    915A  LEU*     3.6    25.1    -      -       +      -
    883C  ASN*     4.6     4.5    -      -       -      +
    886C  GLU*     5.1    13.1    -      -       +      +
    887C  LEU*     3.8    28.0    -      -       -      +
    890C  ALA*     3.9    15.0    -      -       +      +
    912C  ASN*     2.9    18.6    +      -       +      +
    913C  VAL      3.4     8.1    +      -       -      -
    915C  LEU*     1.3    72.8    -      -       -      +
    917C  LEU*     1.3    66.6    +      -       -      +
    919C  LYS*     3.5    12.3    +      -       -      +
    920C  LEU*     3.2    20.4    +      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 917 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    887C  LEU*     3.4    24.9    -      -       +      -
    913C  VAL*     3.1    15.3    +      -       +      +
    914C  GLY      2.9     9.5    +      -       -      +
    916C  THR*     1.3    74.4    +      -       -      +
    918C  ARG*     1.3    62.2    +      -       -      +
    920C  LEU*     3.0     7.7    +      -       +      +
    921C  ILE*     2.8    40.2    +      -       +      +
    946C  LEU*     3.9    48.2    -      -       +      +
    947C  ASN*     4.1    10.3    -      -       -      +
    950C  LEU*     3.8    30.1    -      -       +      -
    983C  LEU*     4.5     6.5    -      -       +      -
    267G  LEU*     4.1     3.1    -      -       +      -
----------------------------------------------------------
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Residues in contact with ARG 918 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    879A  LEU*     6.0     4.9    -      -       -      +
    883A  ASN*     5.6     2.2    -      -       -      +
    886A  GLU*     5.7     0.9    -      -       -      -
    919A  LYS*     3.1    43.8    -      -       -      +
    914C  GLY      2.9    10.7    +      -       -      +
    915C  LEU*     3.4    15.3    -      -       -      +
    917C  LEU*     1.3    77.3    -      -       -      +
    919C  LYS*     1.3    63.6    +      -       -      +
    921C  ILE*     3.2     1.3    +      -       -      +
    922C  GLY*     2.8    24.5    +      -       -      +
    264G  THR*     4.7    17.6    -      -       +      +
    267G  LEU*     3.4    25.6    -      -       +      -
    268G  ASP*     2.7    47.3    +      -       -      +
    271G  MET*     6.2     1.6    -      -       +      -
----------------------------------------------------------
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Residues in contact with LYS 919 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    915A  LEU*     4.0    22.8    -      -       -      +
    918A  ARG*     3.7    50.7    -      -       -      +
    883C  ASN*     3.0    29.4    -      -       +      +
    886C  GLU*     2.8    31.4    +      -       -      +
    915C  LEU      3.0    12.6    +      -       -      +
    916C  THR*     3.6    12.1    -      -       -      +
    917C  LEU      3.3     0.2    -      -       -      -
    918C  ARG*     1.3    76.1    -      -       -      +
    920C  LEU*     1.3    61.6    +      -       -      +
    922C  GLY*     3.6     1.1    +      -       -      -
    923C  SER*     3.2    22.2    +      -       -      -
    268E  ASP*     4.4     3.0    +      -       -      -
    271E  MET*     6.2     1.6    -      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 920 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    880C  VAL*     3.8    11.2    -      -       +      +
    883C  ASN*     3.6    26.9    -      -       +      +
    884C  VAL*     3.6    37.7    -      -       +      -
    887C  LEU*     3.9    23.3    -      -       +      -
    916C  THR      3.2    10.3    +      -       -      +
    917C  LEU*     3.0    15.8    +      -       +      +
    919C  LYS*     1.3    76.4    -      -       -      +
    921C  ILE*     1.3    68.8    +      -       -      +
    922C  GLY      3.1     0.2    +      -       -      -
    923C  SER*     3.0    19.8    +      -       -      +
    924C  VAL*     3.2     6.6    +      -       +      +
    946C  LEU*     4.5     6.5    -      -       +      -
    987C  ALA*     4.7     5.4    -      -       +      -
    990C  LEU*     4.1    23.1    -      -       +      -
----------------------------------------------------------
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Residues in contact with ILE 921 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    917C  LEU*     2.8    32.0    +      -       +      +
    918C  ARG*     3.7     4.7    -      -       +      +
    920C  LEU*     1.3    72.5    -      -       +      +
    922C  GLY*     1.3    68.6    +      -       -      +
    924C  VAL*     3.1     6.6    +      -       -      +
    925C  ASP*     3.0    21.4    +      -       -      +
    943C  GLN*     3.7    33.6    +      -       +      +
    946C  LEU*     5.1     3.8    -      -       +      -
    947C  ASN*     3.4    30.7    -      -       -      +
    990C  LEU*     6.1     2.2    -      -       +      -
    263G  ALA*     4.3     8.1    -      -       +      -
    264G  THR*     3.9    31.6    -      -       +      +
    267G  LEU*     3.7    19.3    -      -       +      -
----------------------------------------------------------
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Residues in contact with GLY 922 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    918C  ARG*     2.8    20.2    +      -       -      -
    919C  LYS*     3.9     1.6    -      -       -      -
    921C  ILE*     1.3    78.3    -      -       -      +
    923C  SER*     1.3    63.4    +      -       -      +
    924C  VAL      2.9     1.9    +      -       -      -
    925C  ASP*     3.0    14.3    +      -       -      +
    926C  ASP*     3.3    16.9    +      -       -      +
    264G  THR*     5.2     6.5    -      -       -      -
----------------------------------------------------------
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Residues in contact with SER 923 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    879C  LEU*     4.7    17.3    -      -       -      -
    880C  VAL*     3.9    15.7    -      -       -      +
    883C  ASN*     2.9    27.9    +      -       -      -
    919C  LYS      3.2     6.2    +      -       -      -
    920C  LEU*     3.0    16.9    +      -       -      -
    922C  GLY*     1.3    73.9    -      -       -      +
    924C  VAL*     1.3    56.9    +      -       -      +
    926C  ASP*     3.1    27.0    -      -       -      +
    927C  LEU*     3.3    16.2    -      -       -      +
----------------------------------------------------------
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Residues in contact with VAL 924 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    880C  VAL*     3.5    33.7    -      -       +      -
    920C  LEU*     3.2     8.7    +      -       +      +
    921C  ILE*     3.1     8.5    +      -       -      +
    922C  GLY      2.9     1.0    +      -       -      -
    923C  SER*     1.3    74.5    +      -       -      +
    925C  ASP*     1.3    59.3    +      -       -      +
    926C  ASP      2.8    10.8    +      -       -      -
    927C  LEU*     2.8    15.1    +      -       -      +
    928C  LEU*     3.2    17.1    +      -       +      +
    939C  ILE*     4.2    18.2    -      -       +      -
    943C  GLN*     3.1    28.5    -      -       +      +
    990C  LEU*     4.1    18.4    -      -       +      -
    994C  VAL*     4.7     8.3    -      -       +      -
----------------------------------------------------------
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Residues in contact with ASP 925 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    921C  ILE*     3.0    12.7    +      -       -      +
    922C  GLY*     3.5     9.9    -      -       -      +
    924C  VAL*     1.3    73.0    -      -       -      +
    926C  ASP*     1.3    62.8    +      -       -      +
    927C  LEU      3.4     0.6    +      -       -      -
    928C  LEU*     4.0    16.5    -      -       -      +
    929C  PRO*     3.8    14.4    -      -       -      +
    943C  GLN*     2.7    35.5    +      -       -      +
    262G  SER      3.9    17.2    +      -       -      -
    263G  ALA*     4.4     4.4    +      -       -      +
    264G  THR*     3.9    21.2    -      -       +      +
----------------------------------------------------------
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Residues in contact with ASP 926 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    922C  GLY*     3.4    12.8    -      -       -      +
    923C  SER*     3.1    19.2    +      -       -      +
    924C  VAL      2.8     2.0    +      -       -      -
    925C  ASP*     1.3    82.6    -      -       -      +
    927C  LEU*     1.3    64.8    +      -       +      +
    929C  PRO*     3.9    12.2    -      -       -      +
----------------------------------------------------------
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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