Contacts of the helix formed by residues 210 - 230 (chain A) in PDB entry 3EHN


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 210 (chain A).
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    198A  SER*     5.3     1.8    -      -       -      +
    204A  ASP*     4.1     0.4    +      -       -      -
    207A  TYR*     3.2    16.8    +      -       -      +
    208A  ASN      3.1     4.4    +      -       -      +
    209A  GLY*     1.3    72.6    -      -       -      +
    211A  VAL*     1.3    62.0    +      -       -      +
    212A  GLN*     3.1    26.9    +      -       -      +
    213A  ASN*     3.1    36.5    +      -       +      +
    214A  TRP*     3.4    13.7    +      -       -      -
----------------------------------------------------------
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Residues in contact with VAL 211 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    138A  ILE*     4.8     4.9    -      -       +      -
    192A  LEU*     3.3    49.1    -      -       +      +
    195A  ILE*     3.9    16.8    -      -       +      +
    196A  SER      5.9     0.4    -      -       -      -
    197A  TYR      3.7    12.6    -      -       -      +
    198A  SER*     5.3     0.6    -      -       -      +
    199A  VAL*     3.5    34.3    -      -       +      -
    209A  GLY      2.9     9.1    +      -       -      +
    210A  ASN*     1.3    72.7    +      -       -      +
    212A  GLN*     1.3    63.7    +      -       -      +
    214A  TRP*     3.2    10.0    +      -       -      +
    215A  VAL*     3.2    19.8    +      -       -      +
----------------------------------------------------------
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Residues in contact with GLN 212 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    192A  LEU      4.9     1.6    -      -       -      +
    193A  ASN*     5.4     6.5    -      -       -      +
    195A  ILE      3.9    17.0    +      -       -      +
    196A  SER*     5.2     9.1    +      -       -      +
    210A  ASN*     3.1    12.2    +      -       -      +
    211A  VAL*     1.3    81.3    -      -       -      +
    213A  ASN*     1.3    66.4    +      -       -      +
    215A  VAL*     3.2    11.6    +      -       +      +
    216A  LYS*     3.2    27.6    +      -       +      +
    250A  GLY      5.3     0.2    -      -       -      +
----------------------------------------------------------
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Residues in contact with ASN 213 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    207A  TYR*     3.4    49.3    -      -       +      +
    210A  ASN*     3.1    28.8    +      -       -      +
    212A  GLN*     1.3    82.9    -      -       -      +
    214A  TRP*     1.3    56.5    +      -       -      +
    216A  LYS*     3.3    18.5    +      -       -      +
    217A  LEU      3.0    21.3    +      -       -      -
    257A  SER      4.7     6.4    -      -       -      +
    258A  SER*     3.8    24.2    +      -       -      -
----------------------------------------------------------
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Residues in contact with TRP 214 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     43A  PHE*     4.1     7.4    -      +       -      -
     47A  GLN*     5.1     0.4    -      -       +      -
    138A  ILE*     3.8    37.9    -      -       +      +
    141A  ILE*     4.0    21.6    -      -       +      +
    142A  VAL*     3.5    34.3    -      -       +      -
    192A  LEU*     4.3    15.5    -      -       +      -
    199A  VAL      5.8     0.2    +      -       -      -
    204A  ASP*     2.8    42.4    +      -       -      -
    206A  ILE*     3.7    24.0    -      -       +      -
    207A  TYR*     3.8    10.0    -      +       -      +
    209A  GLY*     5.0     1.7    -      -       -      -
    210A  ASN      3.4    24.8    +      -       -      -
    211A  VAL*     3.2     8.8    +      -       -      +
    213A  ASN*     1.3    74.5    -      -       -      +
    215A  VAL*     1.3    66.7    +      -       -      +
    217A  LEU*     3.2    29.4    +      -       +      +
    218A  ALA*     3.0    23.2    +      -       -      +
    355A  TRP*     4.1     2.2    -      +       -      -
----------------------------------------------------------
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Residues in contact with VAL 215 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    189A  VAL*     3.7    14.6    -      -       +      +
    192A  LEU*     3.7    32.5    -      -       +      +
    193A  ASN*     3.8    20.4    -      -       -      +
    211A  VAL      3.2    15.5    +      -       -      +
    212A  GLN*     3.2    13.4    +      -       +      +
    214A  TRP*     1.3    76.2    -      -       -      +
    216A  LYS*     1.3    58.8    +      -       -      +
    218A  ALA*     3.3     7.3    +      -       -      +
    219A  ASN*     3.0    31.2    +      -       -      +
    249A  ASN      3.3    25.8    -      -       -      +
    250A  GLY*     4.0     8.1    -      -       -      -
----------------------------------------------------------
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Residues in contact with LYS 216 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    212A  GLN*     3.2    14.5    +      -       -      +
    213A  ASN*     3.5    25.3    -      -       -      +
    214A  TRP      3.2     0.4    -      -       -      -
    215A  VAL*     1.3    76.2    -      -       -      +
    217A  LEU*     1.3    59.2    +      -       -      +
    219A  ASN*     3.4     1.6    +      -       -      +
    220A  SER*     2.8    35.4    +      -       -      -
    250A  GLY      3.5    26.5    -      -       -      +
    251A  GLY*     3.6    10.3    -      -       -      +
    252A  VAL*     3.6    25.6    +      -       -      +
    253A  ILE*     4.1     7.4    -      -       +      -
    254A  GLU*     5.2     1.8    +      -       -      +
    255A  ASP*     4.1    10.7    +      -       -      -
    258A  SER*     4.1    18.1    +      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 217 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    141A  ILE*     4.7     3.6    -      -       +      -
    145A  ILE*     3.4    35.4    -      -       +      -
    206A  ILE*     4.8     0.2    -      -       +      -
    207A  TYR*     4.0     9.4    -      -       +      +
    213A  ASN      3.0    13.9    +      -       -      +
    214A  TRP*     3.2    34.1    +      -       +      +
    216A  LYS*     1.3    76.4    -      -       -      +
    218A  ALA*     1.3    58.9    +      -       -      +
    220A  SER*     3.2     1.2    +      -       -      -
    221A  LEU*     2.9    28.7    +      -       +      +
    253A  ILE*     4.1    10.3    -      -       +      +
    260A  ALA*     3.9    24.2    -      -       +      -
    355A  TRP*     3.9    10.5    -      -       +      -
    356A  PHE*     4.0    22.0    -      -       +      -
----------------------------------------------------------
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Residues in contact with ALA 218 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    141A  ILE*     3.8    24.6    -      -       +      +
    185A  LEU*     4.2    22.7    -      -       +      +
    189A  VAL*     3.9    19.5    -      -       +      -
    214A  TRP      3.0    12.2    +      -       -      +
    215A  VAL*     3.5     8.7    -      -       -      +
    217A  LEU*     1.3    75.3    -      -       -      +
    219A  ASN*     1.3    65.9    +      -       -      +
    221A  LEU*     3.1     6.6    +      -       -      +
    222A  MET*     3.0    22.5    +      -       -      +
----------------------------------------------------------
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Residues in contact with ASN 219 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    189A  VAL*     3.8    18.5    -      -       -      +
    215A  VAL*     3.0    24.0    +      -       -      +
    218A  ALA*     1.3    75.9    -      -       -      +
    220A  SER*     1.3    57.5    +      -       -      +
    222A  MET*     3.0    15.0    +      -       -      +
    223A  LEU*     2.8    26.0    +      -       -      +
    243A  LYS      3.9     5.5    -      -       -      +
    244A  ALA*     3.5    32.7    +      -       -      +
    249A  ASN*     2.9    28.6    +      -       -      +
    251A  GLY      3.0    28.7    +      -       -      +
    252A  VAL*     3.8     3.4    -      -       +      -
----------------------------------------------------------
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Residues in contact with SER 220 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    216A  LYS      2.8    15.7    +      -       -      -
    217A  LEU*     3.4     6.3    -      -       -      -
    218A  ALA      3.1     0.2    -      -       -      -
    219A  ASN*     1.3    77.0    -      -       -      +
    221A  LEU*     1.3    60.9    +      -       -      +
    223A  LEU*     3.6     5.3    +      -       -      +
    224A  ARG      3.3    11.3    +      -       -      -
    252A  VAL*     3.3    10.2    -      -       -      +
    253A  ILE*     2.8    42.3    +      -       -      +
    356A  PHE*     3.1    40.0    -      -       -      -
    361A  THR*     4.2     2.4    +      -       -      -
----------------------------------------------------------
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Residues in contact with LEU 221 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    141A  ILE*     5.1     1.3    -      -       +      +
    144A  ASN*     4.3     8.7    -      -       +      +
    145A  ILE*     4.0    44.0    -      -       +      +
    148A  LEU*     4.0    15.3    -      -       +      -
    181A  MET*     4.9     0.2    -      -       -      -
    185A  LEU*     4.0    25.4    -      -       +      -
    217A  LEU*     2.9    16.0    +      -       +      +
    218A  ALA*     3.1     7.6    +      -       -      +
    220A  SER*     1.3    75.1    -      -       -      +
    222A  MET*     1.3    61.2    +      -       -      +
    224A  ARG*     3.3    32.7    +      -       -      +
    225A  ILE*     2.9    42.5    +      -       +      +
    356A  PHE*     4.3     6.0    -      -       +      -
----------------------------------------------------------
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Residues in contact with MET 222 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    182A  LEU*     4.1    10.1    -      -       +      +
    185A  LEU*     3.8    20.8    -      -       +      +
    186A  SER*     3.6    34.3    -      -       -      +
    189A  VAL*     4.1     5.4    -      -       +      -
    218A  ALA      3.0     8.7    +      -       -      +
    219A  ASN*     3.0    26.2    -      -       -      +
    221A  LEU*     1.3    75.1    -      -       -      +
    223A  LEU*     1.3    60.4    +      -       -      +
    224A  ARG      3.1     0.3    +      -       -      -
    225A  ILE*     3.1     5.6    +      -       -      +
    226A  VAL*     2.8    34.5    +      -       -      +
    240A  TYR*     4.0    34.3    -      -       +      +
    243A  LYS*     4.3     7.4    -      -       +      -
    244A  ALA*     4.0    26.7    -      -       +      -
----------------------------------------------------------
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Residues in contact with LEU 223 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    219A  ASN      2.8    15.1    +      -       -      +
    220A  SER*     3.7     7.9    -      -       -      +
    222A  MET*     1.3    76.6    -      -       -      +
    224A  ARG*     1.3    59.4    +      -       -      +
    226A  VAL*     2.8    22.3    -      -       +      +
    227A  VAL*     3.1    23.0    -      -       +      +
    241A  ILE*     3.8    30.5    -      -       +      -
    244A  ALA*     4.0     7.6    -      -       +      +
    245A  LEU*     4.2    25.1    -      -       +      -
    252A  VAL*     4.8     4.7    -      -       +      -
    356A  PHE*     5.6     0.4    -      -       +      -
    361A  THR*     4.1    25.4    -      -       +      +
    364A  LEU*     3.8    28.5    -      -       +      -
    365A  LYS*     4.4     8.7    -      -       +      -
    368A  ALA*     5.2     2.7    -      -       +      -
----------------------------------------------------------
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Residues in contact with ARG 224 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    145A  ILE*     4.7    10.1    +      -       -      +
    148A  LEU*     4.1    13.7    -      -       +      +
    149A  ARG*     5.9     4.6    -      -       -      +
    220A  SER      3.3    12.2    +      -       -      +
    221A  LEU*     3.3    27.4    -      -       -      +
    222A  MET      3.0     0.8    -      -       -      -
    223A  LEU*     1.3    76.6    -      -       -      +
    225A  ILE*     1.3    65.8    +      -       -      +
    227A  VAL*     3.2     5.4    +      -       -      +
    228A  ARG*     3.0    33.0    +      -       -      +
    355A  TRP      3.7    17.0    +      -       -      -
    356A  PHE*     3.2    16.9    -      -       +      -
    360A  GLU*     2.7    58.7    +      -       -      -
    364A  LEU*     3.9    14.5    -      -       +      +
    462A  ASN*     4.8     4.4    -      -       -      +
    465A  GLU*     3.1    38.9    +      -       -      +
----------------------------------------------------------
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Residues in contact with ILE 225 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    148A  LEU*     4.0    19.3    -      -       +      -
    178A  TYR*     3.2    31.9    -      -       +      +
    181A  MET*     4.0    25.6    -      -       +      -
    182A  LEU*     3.6    26.7    -      -       +      -
    185A  LEU*     3.5    28.0    -      -       +      -
    221A  LEU*     2.9    21.5    +      -       +      +
    222A  MET      3.6     3.6    -      -       -      +
    224A  ARG*     1.3    75.6    -      -       -      +
    226A  VAL*     1.3    63.0    +      -       -      +
    228A  ARG*     3.2    10.8    +      -       -      +
    229A  VAL*     3.2    22.1    +      -       +      +
----------------------------------------------------------
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Residues in contact with VAL 226 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    182A  LEU*     4.3     6.5    -      -       +      -
    222A  MET      2.8    24.2    +      -       -      +
    223A  LEU*     2.8    37.2    -      -       +      +
    225A  ILE*     1.3    69.9    -      -       -      +
    227A  VAL*     1.3    66.7    +      -       +      +
    229A  VAL*     3.3     7.9    +      -       -      +
    230A  HIS*     3.2    18.2    +      -       -      +
    236A  LEU      4.8     0.4    -      -       -      +
    237A  ALA*     3.4    26.5    -      -       -      +
    240A  TYR*     3.3    35.7    -      -       +      -
    241A  ILE*     3.4    26.7    -      -       +      +
    373A  LEU*     5.4     1.1    -      -       +      -
----------------------------------------------------------
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Residues in contact with VAL 227 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    223A  LEU*     3.1    23.3    -      -       +      +
    224A  ARG      3.2     5.2    +      -       -      +
    226A  VAL*     1.3    82.2    -      -       +      +
    228A  ARG*     1.3    63.8    +      -       -      +
    229A  VAL      3.3     0.5    +      -       -      -
    230A  HIS*     3.3    25.7    +      -       +      -
    241A  ILE*     5.4     0.2    -      -       +      -
    364A  LEU*     3.9    39.7    -      -       +      +
    367A  GLU*     3.5    37.9    -      -       +      +
    368A  ALA*     4.8     8.7    -      -       +      +
    373A  LEU*     5.1     4.0    -      -       +      -
    469A  GLU*     5.1     0.4    -      -       -      +
    472A  ARG*     3.5    12.0    +      -       -      +
----------------------------------------------------------
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Residues in contact with ARG 228 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    148A  LEU*     3.9    18.0    -      -       -      +
    152A  ASP*     2.7    23.7    +      -       -      -
    178A  TYR*     3.1    27.8    +      -       +      +
    224A  ARG*     3.0    24.2    +      -       -      +
    225A  ILE*     3.2    14.1    -      -       -      +
    226A  VAL      3.2     0.2    -      -       -      -
    227A  VAL*     1.3    78.5    -      -       -      +
    229A  VAL*     1.3    58.9    +      -       +      +
    231A  PHE*     4.8     2.9    +      -       -      +
    232A  ILE*     5.5     0.7    +      -       -      +
    465A  GLU*     2.7    40.0    +      -       -      -
    468A  THR*     3.5    19.1    -      -       -      +
    469A  GLU*     2.8    24.7    +      -       -      -
    472A  ARG*     3.3    35.9    +      -       -      +
    535A  TRP*     3.7    27.6    -      -       +      +
----------------------------------------------------------
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Residues in contact with VAL 229 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    178A  TYR*     3.6    28.7    -      -       +      -
    182A  LEU*     5.4     1.6    -      -       +      -
    225A  ILE*     3.2    14.8    +      -       +      +
    226A  VAL*     3.4    16.4    -      -       -      +
    228A  ARG*     1.3    78.0    -      -       +      +
    230A  HIS*     1.3    58.9    +      -       -      +
    231A  PHE      3.4     2.5    -      -       -      -
    232A  ILE*     3.1     7.4    +      -       -      +
    233A  ASP*     2.8    31.9    +      -       +      +
    236A  LEU*     4.1    15.9    -      -       +      -
    237A  ALA*     3.9    21.8    -      -       -      +
    534A  TRP*     3.6    28.9    -      -       +      -
    535A  TRP*     5.1     1.1    -      -       +      -
----------------------------------------------------------
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Residues in contact with HIS 230 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    226A  VAL      3.2     8.7    +      -       -      +
    227A  VAL*     3.3    23.8    +      -       +      -
    229A  VAL*     1.3    76.3    -      -       -      +
    231A  PHE*     1.3    94.3    +      +       -      +
    233A  ASP      4.1     0.2    -      -       -      -
    234A  GLU*     2.8    57.1    +      -       -      +
    237A  ALA*     3.5    21.3    -      -       +      -
    367A  GLU*     3.1    28.0    +      -       +      -
    371A  TYR*     3.3    41.4    -      +       +      +
    373A  LEU*     3.9    14.6    -      -       +      -
----------------------------------------------------------
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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