Contacts of the helix formed by residues 917 - 937 (chain A) in PDB entry 3H2V


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 ASN 917 (chain A).
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    912A  TRP*     5.5     0.4    -      -       -      +
    913A  SER      4.0     5.8    +      -       -      +
    914A  SER      2.9    18.1    +      -       -      +
    916A  GLY*     1.3    77.1    -      -       -      +
    918A  ASP*     1.3    58.8    +      -       -      +
    919A  ILE*     3.2    13.0    +      -       -      +
    920A  ILE*     3.2    26.7    +      -       +      +
    921A  ALA*     3.2    18.4    +      -       -      +
   1056A  LEU*     3.1    26.8    -      -       -      +
   1057A  ARG      2.9    28.6    +      -       -      +
   1058A  TRP*     3.5    29.5    -      -       -      -
----------------------------------------------------------
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Residues in contact with ASP 918 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    914A  SER      5.0     1.6    -      -       -      +
    916A  GLY*     4.1     2.8    +      -       -      -
    917A  ASN*     1.3    72.5    +      -       -      +
    919A  ILE*     1.3    65.4    +      -       -      +
    920A  ILE      3.2     0.2    -      -       -      -
    921A  ALA*     3.6    12.6    -      -       -      +
    922A  ALA*     2.9    26.5    +      -       -      +
    925A  ARG*     4.7     4.7    +      -       -      +
    963A  ARG*     5.3     4.0    +      -       -      -
    964A  LEU*     3.4    26.2    -      -       +      +
   1054A  PHE*     6.5     0.4    -      -       +      -
   1056A  LEU*     3.9     6.5    -      -       +      +
     73F  GLN*     5.2    13.2    +      -       -      +
----------------------------------------------------------
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Residues in contact with ILE 919 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    917A  ASN*     3.2    10.9    +      -       -      +
    918A  ASP*     1.3    80.5    -      -       -      +
    920A  ILE*     1.3    57.6    +      -       -      +
    922A  ALA*     3.4     4.3    +      -       -      +
    923A  ALA*     2.9    28.4    +      -       -      +
    961A  VAL*     4.0    22.3    -      -       +      +
    964A  LEU*     3.8    18.4    -      -       +      +
    965A  ALA*     3.9    28.7    -      -       +      +
    968A  VAL*     5.0     0.9    -      -       +      -
   1037A  THR*     4.4     4.3    -      -       +      -
   1038A  VAL*     4.0    27.6    -      -       +      -
   1041A  ALA*     4.1    15.0    -      -       +      -
   1056A  LEU*     3.6    20.6    -      -       +      +
   1058A  TRP*     4.6    10.3    -      -       +      -
----------------------------------------------------------
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Residues in contact with ILE 920 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    909A  ALA*     3.1    32.3    -      -       +      +
    912A  TRP*     3.7    26.7    -      -       +      +
    913A  SER      4.3     3.8    -      -       -      +
    914A  SER*     4.3     2.5    -      -       -      +
    917A  ASN*     3.2    32.9    +      -       +      +
    918A  ASP      3.2     0.2    -      -       -      -
    919A  ILE*     1.3    76.5    -      -       +      +
    921A  ALA*     1.3    64.4    +      -       -      +
    923A  ALA*     3.8     3.0    -      -       -      +
    924A  LYS*     3.0    40.8    +      -       +      +
   1038A  VAL*     4.4    13.5    -      -       +      -
   1058A  TRP*     3.7    24.5    -      -       +      -
----------------------------------------------------------
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Residues in contact with ALA 921 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    914A  SER*     4.5    18.4    -      -       -      +
    917A  ASN      3.2    12.1    +      -       -      +
    918A  ASP*     3.7    16.8    -      -       -      +
    919A  ILE      3.3     0.6    -      -       -      -
    920A  ILE*     1.3    78.8    -      -       -      +
    922A  ALA*     1.3    60.7    +      -       -      +
    924A  LYS*     3.5     6.2    +      -       -      +
    925A  ARG*     3.1    38.3    +      -       -      +
----------------------------------------------------------
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Residues in contact with ALA 922 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    918A  ASP      2.9    18.4    +      -       -      +
    919A  ILE*     3.7     3.4    -      -       -      +
    921A  ALA*     1.3    74.7    -      -       -      +
    923A  ALA*     1.3    56.5    +      -       -      +
    925A  ARG*     2.9    28.3    +      -       -      +
    926A  MET*     2.8    38.6    +      -       -      +
    957A  ALA*     4.0    10.7    -      -       +      +
    960A  GLU*     4.9     6.3    -      -       +      -
    961A  VAL*     3.8    22.7    -      -       +      +
    964A  LEU*     6.1     0.2    -      -       +      -
----------------------------------------------------------
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Residues in contact with ALA 923 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    905A  LEU*     3.2    23.0    -      -       +      +
    909A  ALA*     4.0    17.9    -      -       +      -
    919A  ILE      2.9    18.1    +      -       -      +
    920A  ILE*     3.8     6.1    -      -       -      +
    922A  ALA*     1.3    77.6    -      -       -      +
    924A  LYS*     1.3    62.2    +      -       -      +
    926A  MET*     3.3     3.2    +      -       -      +
    927A  ALA      3.0    19.1    +      -       -      -
    961A  VAL*     4.6     0.8    -      -       +      +
   1034A  VAL*     4.2    22.9    -      -       +      -
   1038A  VAL*     4.9     9.6    -      -       +      -
----------------------------------------------------------
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Residues in contact with LYS 924 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    906A  HIS*     4.5    21.2    -      -       +      +
    909A  ALA*     3.1    34.1    -      -       +      -
    910A  ARG*     3.9     9.7    -      -       -      +
    912A  TRP      2.9    23.4    +      -       -      -
    913A  SER*     4.4     0.6    -      -       -      +
    914A  SER*     2.8    32.2    +      -       -      +
    920A  ILE*     3.0    20.2    +      -       -      +
    921A  ALA*     3.7     5.8    -      -       -      +
    923A  ALA*     1.3    74.4    -      -       -      +
    925A  ARG*     1.3    63.1    +      -       +      +
    927A  ALA*     3.4     6.8    +      -       -      +
    928A  LEU*     3.1    32.6    +      -       +      +
   1061A  LYS*     4.6     9.7    -      -       -      +
----------------------------------------------------------
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Residues in contact with ARG 925 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    918A  ASP*     4.7     5.5    +      -       -      +
    921A  ALA*     3.1    21.2    +      -       -      +
    922A  ALA*     2.9    44.1    +      -       -      +
    924A  LYS*     1.3    72.6    -      -       -      +
    926A  MET*     1.3    66.9    +      -       -      +
    928A  LEU*     3.0    12.6    +      -       +      +
    929A  LEU*     2.9    32.7    +      -       +      +
    957A  ALA*     4.4    18.1    -      -       +      +
    960A  GLU*     5.6     6.3    -      -       -      +
     69E  ASP*     4.3    24.0    -      -       +      -
----------------------------------------------------------
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Residues in contact with MET 926 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    905A  LEU*     4.1     4.7    -      -       +      -
    922A  ALA      2.8    13.3    +      -       -      +
    923A  ALA      3.6     7.2    -      -       -      +
    925A  ARG*     1.3    71.0    -      -       -      +
    927A  ALA*     1.3    54.6    +      -       -      +
    929A  LEU*     2.8    12.4    +      -       -      +
    930A  MET*     2.7    37.1    +      -       -      +
    954A  ILE*     4.2    10.8    -      -       +      +
    957A  ALA*     3.2    24.9    -      -       +      +
    958A  SER*     3.8    27.6    -      -       -      +
    961A  VAL*     4.3     4.5    -      -       -      -
   1030A  LEU*     3.8    16.2    -      -       +      -
   1031A  MET*     3.7    22.9    -      -       +      -
   1034A  VAL*     3.3    42.8    -      -       +      -
----------------------------------------------------------
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Residues in contact with ALA 927 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    885A  PHE*     4.2     4.3    -      -       +      -
    902A  ALA*     3.4    29.2    -      -       -      +
    905A  LEU*     3.6    19.0    -      -       +      +
    906A  HIS*     3.8    22.4    -      -       +      +
    923A  ALA      3.0     8.3    +      -       -      +
    924A  LYS      3.7     8.1    -      -       -      +
    926A  MET*     1.3    74.2    -      -       -      +
    928A  LEU*     1.3    56.6    +      -       -      +
    930A  MET*     3.2     9.0    +      -       -      +
    931A  ALA*     3.0    28.2    +      -       -      +
   1031A  MET*     4.9     0.2    -      -       -      -
----------------------------------------------------------
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Residues in contact with LEU 928 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    885A  PHE*     3.6    29.8    -      -       +      -
    906A  HIS*     5.2     6.3    -      -       -      +
    924A  LYS*     3.1    26.8    +      -       +      +
    925A  ARG*     3.0    13.2    +      -       +      +
    927A  ALA*     1.3    75.9    -      -       -      +
    929A  LEU*     1.3    58.5    +      -       -      +
    930A  MET      3.4     0.2    -      -       -      -
    931A  ALA*     3.7     6.1    -      -       +      +
    932A  GLU*     3.3    16.6    +      -       -      +
    935A  ARG*     4.3     2.6    +      -       -      -
     68E  GLY*     3.3    32.3    -      -       -      +
     69E  ASP*     5.0     2.2    -      -       -      -
     91E  LYS*     3.8    39.4    -      -       +      +
     92E  TYR*     4.2     4.5    -      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 929 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    925A  ARG*     2.9    28.2    +      -       +      +
    926A  MET*     2.8    15.0    +      -       -      +
    928A  LEU*     1.3    70.7    -      -       -      +
    930A  MET*     1.3    60.6    +      -       -      +
    931A  ALA      3.3     0.2    -      -       -      -
    932A  GLU*     3.3     7.4    +      -       -      +
    933A  MET*     3.0    21.1    +      -       -      +
    950A  CYS*     3.5    12.4    -      -       -      +
    953A  ASP*     3.6    35.2    -      -       +      +
    954A  ILE*     3.8    23.7    -      -       +      +
    957A  ALA*     4.9     3.6    -      -       +      -
     68E  GLY*     4.1     3.6    -      -       -      -
     69E  ASP*     3.5    44.0    -      -       +      +
    121E  ARG*     3.8    11.0    -      -       -      +
----------------------------------------------------------
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Residues in contact with MET 930 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    898A  MET*     3.5    35.7    -      -       +      +
    902A  ALA*     3.6    16.4    -      -       +      +
    926A  MET      2.7    15.1    +      -       -      +
    927A  ALA      3.4     8.7    -      -       -      +
    929A  LEU*     1.3    69.2    -      -       -      +
    931A  ALA*     1.3    67.2    +      -       -      +
    933A  MET*     3.0    16.3    +      -       -      +
    934A  SER*     3.1    12.8    +      -       -      -
    954A  ILE*     3.2    35.4    -      -       +      -
    995A  LEU*     5.0     2.2    -      -       +      -
   1027A  ALA*     3.9    17.9    -      -       +      -
   1030A  LEU*     4.8     2.0    -      -       +      -
   1031A  MET*     3.3    43.5    -      -       +      -
----------------------------------------------------------
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Residues in contact with ALA 931 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    885A  PHE*     4.5     9.4    -      -       +      -
    899A  MET*     3.5    38.4    -      -       +      +
    902A  ALA*     3.7     5.5    -      -       +      +
    927A  ALA      3.0    15.9    +      -       -      +
    928A  LEU*     3.7    10.8    -      -       +      +
    930A  MET*     1.3    76.2    -      -       -      +
    932A  GLU*     1.3    63.4    +      -       -      +
    933A  MET      3.0     0.2    +      -       -      -
    934A  SER*     2.9    18.8    +      -       -      -
    935A  ARG*     3.4    12.3    +      -       -      +
     92E  TYR*     4.5     7.2    -      -       +      +
----------------------------------------------------------
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Residues in contact with GLU 932 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    928A  LEU      3.3    10.2    +      -       -      +
    929A  LEU*     3.5     9.9    -      -       -      +
    930A  MET      3.2     0.2    -      -       -      -
    931A  ALA*     1.3    77.9    -      -       -      +
    933A  MET*     1.3    56.4    +      -       -      +
    935A  ARG*     3.3    33.3    -      -       -      +
    936A  LEU*     2.9    51.7    +      -       +      +
    946A  ALA*     4.9     0.2    -      -       -      +
    950A  CYS*     4.1     7.0    -      -       -      -
     65E  GLY      5.2     0.7    -      -       -      +
     66E  LEU      4.1     5.6    -      -       -      +
     67E  PRO*     4.1     4.5    -      -       -      +
     68E  GLY*     2.5    33.7    +      -       -      -
    121E  ARG*     3.0    38.1    +      -       -      +
----------------------------------------------------------
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Residues in contact with MET 933 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    898A  MET*     3.7    20.4    -      -       +      -
    929A  LEU      3.0    13.0    +      -       -      +
    930A  MET*     3.3    13.2    -      -       -      +
    931A  ALA      3.0     0.8    -      -       -      -
    932A  GLU*     1.3    77.5    -      -       -      +
    934A  SER*     1.3    66.9    +      -       -      +
    936A  LEU*     3.6     4.7    -      -       -      -
    937A  VAL*     2.8    29.9    +      -       +      +
    947A  LEU*     3.1    46.9    -      -       +      +
    950A  CYS*     3.6    19.3    -      -       -      -
    951A  ALA*     3.6    18.2    -      -       +      +
    954A  ILE*     4.0    14.6    -      -       -      -
    995A  LEU*     4.7    14.4    -      -       -      -
    999A  SER*     4.6     3.1    -      -       -      -
   1023A  LEU*     5.1    10.8    -      -       +      -
----------------------------------------------------------
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Residues in contact with SER 934 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    894A  ILE*     3.5     6.3    -      -       -      +
    895A  ASN*     3.4    29.4    -      -       -      -
    898A  MET*     3.3    30.4    -      -       -      +
    899A  MET*     2.9    23.9    -      -       -      +
    930A  MET      3.1     6.8    +      -       -      -
    931A  ALA      2.9    15.6    +      -       -      -
    933A  MET*     1.3    76.4    -      -       -      +
    935A  ARG*     1.3    63.0    +      -       -      +
    937A  VAL*     3.4     9.6    +      -       -      +
    938A  ARG*     3.5    13.5    -      -       -      +
----------------------------------------------------------
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Residues in contact with ARG 935 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    893A  VAL      4.3     5.4    -      -       -      +
    894A  ILE*     3.5    28.3    -      -       +      +
    899A  MET*     4.4     3.6    -      -       +      +
    928A  LEU      4.3     3.4    +      -       -      -
    931A  ALA*     3.4     9.4    +      -       -      +
    932A  GLU*     3.3    47.5    +      -       -      +
    933A  MET      3.0     0.2    -      -       -      -
    934A  SER*     1.3    77.1    +      -       -      +
    936A  LEU*     1.3    65.9    +      -       +      +
    938A  ARG*     3.0    19.6    +      -       -      +
    939A  GLY*     3.5     5.9    +      -       -      -
     65E  GLY*     5.7     4.6    -      -       -      +
     66E  LEU      4.3     7.7    +      -       -      -
     68E  GLY*     4.7     3.2    -      -       -      -
     91E  LYS      4.1     7.7    +      -       -      -
     92E  TYR      3.7    22.0    +      -       -      -
     93E  LYS*     3.5    34.5    +      -       -      +
     94E  GLY*     4.0     9.1    +      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 936 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    932A  GLU*     2.9    47.3    +      -       +      +
    933A  MET*     3.6     4.9    -      -       -      +
    935A  ARG*     1.3    72.4    -      -       +      +
    937A  VAL*     1.3    57.3    +      -       -      +
    938A  ARG      3.1     5.0    +      -       -      -
    939A  GLY*     3.3     8.2    +      -       -      -
    943A  THR*     3.6    40.4    +      -       +      -
    946A  ALA*     3.6    22.0    -      -       +      +
    947A  LEU*     3.5    43.9    -      -       +      +
    950A  CYS*     4.0     7.6    -      -       +      -
   1006A  LEU*     4.3     6.2    -      -       -      +
----------------------------------------------------------
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Residues in contact with VAL 937 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    895A  ASN*     3.7    30.5    -      -       +      +
    898A  MET*     4.5    11.2    -      -       -      -
    933A  MET*     2.8    23.0    +      -       +      +
    934A  SER*     3.5    12.6    -      -       -      +
    935A  ARG      3.1     0.8    +      -       -      -
    936A  LEU*     1.3    72.0    -      -       -      +
    938A  ARG*     1.3    65.6    +      -       -      +
    947A  LEU*     4.9     7.2    -      -       +      -
   1002A  LYS*     4.7    20.1    -      -       +      -
   1006A  LEU*     5.3     6.8    -      -       -      +
   1020A  THR*     4.8    14.9    +      -       +      +
   1023A  LEU*     4.3    25.1    -      -       +      -
----------------------------------------------------------
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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