Contacts of the helix formed by residues 119 - 140 (chain B) in PDB entry 1GPU


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 GLY 119 (chain B).
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     66B  SER      4.8     0.4    +      -       -      -
    118B  LEU*     1.3    72.6    -      -       -      +
    120B  GLN*     1.3    61.0    +      -       -      +
    121B  GLY      3.5     1.8    -      -       -      -
    122B  ILE*     3.3    13.2    -      -       -      +
    123B  SER*     2.8    23.7    +      -       -      -
    159B  CYS*     3.3    35.4    -      -       -      +
    162B  GLU*     4.3     0.9    -      -       -      -
    164B  ILE*     3.4    19.1    -      -       -      +
    165B  SER*     4.6     0.2    -      -       -      -
----------------------------------------------------------
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Residues in contact with GLN 120 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    448A  TYR*     2.8    22.2    +      -       -      +
    114B  THR      5.0     2.5    -      -       -      +
    115B  THR*     5.2     1.3    -      -       +      -
    117B  PRO*     3.1    22.1    +      -       +      +
    118B  LEU      3.3     0.2    -      -       -      -
    119B  GLY*     1.3    75.8    -      -       -      +
    121B  GLY*     1.3    54.6    +      -       -      +
    123B  SER*     3.1     4.8    +      -       -      -
    124B  ASN*     2.8    46.7    +      -       -      +
    164B  ILE*     3.7     4.7    -      -       -      +
    419B  HIS*     3.1    22.0    +      -       -      -
    423B  ALA*     3.6    13.3    -      -       -      +
    426B  ASN*     5.2     1.0    -      -       -      +
    451B  GLY      3.5     4.8    -      -       -      -
    452B  ALA*     3.5    29.6    -      -       -      +
    455B  LEU*     3.5    30.7    -      -       +      +
----------------------------------------------------------
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Residues in contact with GLY 121 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     64B  VAL*     3.4    28.9    -      -       -      +
     66B  SER*     3.3    12.2    +      -       -      +
    115B  THR*     3.7    15.5    -      -       -      +
    117B  PRO      4.8     0.4    +      -       -      -
    119B  GLY      4.8     0.2    -      -       -      +
    120B  GLN*     1.3    77.4    -      -       -      +
    122B  ILE*     1.3    63.4    +      -       -      +
    124B  ASN*     3.1    11.6    +      -       -      +
    125B  ALA*     2.9    19.2    +      -       -      +
----------------------------------------------------------
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Residues in contact with ILE 122 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     66B  SER*     2.9    14.9    +      -       -      +
    119B  GLY*     3.3    18.6    -      -       -      +
    121B  GLY*     1.3    71.5    -      -       -      +
    123B  SER*     1.3    65.1    +      -       -      +
    125B  ALA*     3.3     4.8    +      -       +      +
    126B  VAL*     3.1    27.9    +      -       +      +
    153B  VAL*     3.9    28.3    -      -       +      -
    155B  LEU*     4.3    23.1    -      -       +      -
    159B  CYS*     4.6     0.9    -      -       +      -
    165B  SER*     3.7    22.7    -      -       -      +
    168B  ALA*     5.6     0.9    -      -       +      -
    169B  SER*     4.5    14.8    -      -       -      +
    180B  LEU*     5.1     1.8    -      -       +      -
    182B  ALA*     4.3    17.7    -      -       +      -
    207B  TYR*     5.1     1.6    -      -       +      +
    212B  TRP*     4.5    15.3    -      -       +      -
----------------------------------------------------------
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Residues in contact with SER 123 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    119B  GLY      2.8    17.1    +      -       -      -
    120B  GLN      3.1     6.0    +      -       -      -
    122B  ILE*     1.3    77.6    -      -       -      +
    124B  ASN*     1.3    63.2    +      -       -      +
    126B  VAL*     3.2    13.3    +      -       -      +
    127B  GLY      3.3     8.1    +      -       -      -
    164B  ILE*     3.5    17.5    +      -       -      +
    165B  SER*     4.1     1.6    -      -       -      -
    168B  ALA*     3.4    28.7    -      -       -      +
    420B  ALA      4.9     1.6    -      -       -      -
    423B  ALA*     3.4    27.1    -      -       -      -
    424B  ILE*     3.5     9.9    -      -       -      +
----------------------------------------------------------
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Residues in contact with ASN 124 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    113B  VAL*     3.5    43.6    -      -       +      +
    114B  THR      4.3     5.5    -      -       -      +
    120B  GLN*     2.8    37.7    +      -       -      +
    121B  GLY*     3.3     8.0    +      -       -      +
    123B  SER*     1.3    71.9    -      -       -      +
    125B  ALA*     1.3    59.6    +      -       -      +
    127B  GLY      3.0     3.5    +      -       -      -
    128B  MET*     2.9    26.3    +      -       +      +
    423B  ALA*     2.9    34.1    +      -       -      +
    426B  ASN*     3.8    13.1    -      -       -      +
    427B  GLY*     3.3    11.5    -      -       -      -
    455B  LEU*     5.6     1.1    -      -       -      +
----------------------------------------------------------
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Residues in contact with ALA 125 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     64B  VAL*     4.4     5.4    -      -       +      +
    121B  GLY      2.9    11.0    +      -       -      +
    122B  ILE      3.4     8.5    -      -       -      +
    124B  ASN*     1.3    75.9    -      -       -      +
    126B  VAL*     1.3    65.1    +      -       -      +
    128B  MET*     3.1    10.4    +      -       -      +
    129B  ALA*     2.9    22.0    +      -       -      +
    151B  THR*     3.5    18.6    -      -       +      +
    153B  VAL*     3.0    37.2    -      -       +      -
    180B  LEU*     4.0     4.9    -      -       +      +
----------------------------------------------------------
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Residues in contact with VAL 126 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    122B  ILE*     3.1    20.4    +      -       +      +
    123B  SER      3.2     8.5    +      -       -      +
    125B  ALA*     1.3    76.1    -      -       -      +
    127B  GLY*     1.3    61.0    +      -       -      +
    129B  ALA*     3.3     3.0    +      -       -      +
    130B  MET*     3.0    44.4    +      -       -      +
    168B  ALA*     3.8    28.5    -      -       +      +
    169B  SER*     4.9     0.4    -      -       -      +
    171B  LEU      5.4     0.9    -      -       -      -
    172B  ALA*     3.9    28.5    -      -       +      +
    175B  LEU*     5.4     0.2    -      -       +      -
    177B  LEU*     3.9     5.1    -      -       +      +
    180B  LEU*     3.9    17.0    -      -       +      -
    212B  TRP*     5.2     1.1    -      -       +      -
    424B  ILE*     4.0    13.0    -      -       +      -
----------------------------------------------------------
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Residues in contact with GLY 127 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    123B  SER      3.3     4.4    +      -       -      -
    124B  ASN      3.0     9.0    +      -       -      -
    126B  VAL*     1.3    78.6    -      -       -      +
    128B  MET*     1.3    59.3    +      -       -      +
    130B  MET*     3.2     2.6    +      -       -      +
    131B  ALA*     2.9    25.1    +      -       -      +
    424B  ILE*     3.5    34.3    -      -       -      +
    428B  ILE*     3.3    18.1    -      -       -      +
----------------------------------------------------------
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Residues in contact with MET 128 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     62B  ARG*     4.3    24.7    -      -       -      -
     64B  VAL*     3.6    25.4    -      -       +      -
    112B  GLU*     3.6    26.5    -      -       +      +
    113B  VAL*     3.5    32.8    -      -       +      -
    124B  ASN*     2.9    17.1    +      -       +      +
    125B  ALA*     3.1    11.2    +      -       -      +
    127B  GLY*     1.3    76.1    -      -       -      +
    129B  ALA*     1.3    57.7    +      -       -      +
    131B  ALA*     3.3     5.9    +      -       -      +
    132B  GLN*     3.0    27.5    +      -       -      +
    149B  ASN*     5.7     0.2    +      -       -      -
    151B  THR*     3.9    16.3    +      -       +      +
    427B  GLY*     3.4    16.4    -      -       -      +
    430B  ALA*     4.1     9.2    -      -       +      -
    431B  PHE*     3.7     9.7    -      -       +      +
----------------------------------------------------------
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Residues in contact with ALA 129 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    125B  ALA      2.9    16.3    +      -       -      +
    126B  VAL      3.7     4.7    -      -       -      +
    127B  GLY      3.2     0.2    -      -       -      -
    128B  MET*     1.3    73.8    -      -       -      +
    130B  MET*     1.3    64.9    +      -       -      +
    132B  GLN*     3.4     8.1    +      -       -      +
    133B  ALA*     3.0    23.6    +      -       -      +
    151B  THR*     3.7    14.3    +      -       -      +
    177B  LEU*     4.2    17.5    -      -       +      +
    179B  ASN*     5.1     4.9    -      -       +      +
    180B  LEU*     4.0    27.4    -      -       +      +
----------------------------------------------------------
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Residues in contact with MET 130 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    126B  VAL*     3.0    26.5    +      -       -      +
    127B  GLY*     3.2     5.6    +      -       -      +
    129B  ALA*     1.3    78.6    -      -       -      +
    131B  ALA*     1.3    61.2    +      -       -      +
    133B  ALA*     3.3     4.4    +      -       -      +
    134B  ASN*     3.0    21.0    +      -       -      +
    171B  LEU*     5.0     1.1    -      -       +      -
    175B  LEU*     3.7    28.7    -      -       +      -
    177B  LEU*     3.7    16.4    -      -       +      -
    397B  PHE*     3.6    26.3    -      -       +      -
    412B  ILE*     3.5    45.1    -      -       +      -
    414B  TYR*     4.8     0.7    -      -       +      -
    424B  ILE*     3.6    29.8    -      -       +      -
    428B  ILE*     4.5     5.6    -      -       +      -
----------------------------------------------------------
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Residues in contact with ALA 131 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    127B  GLY      2.9    16.8    +      -       -      +
    128B  MET      3.5     5.4    -      -       -      +
    130B  MET*     1.3    76.8    -      -       -      +
    132B  GLN*     1.3    57.0    +      -       -      +
    134B  ASN*     3.3     2.1    +      -       -      -
    135B  LEU*     2.9    28.3    +      -       -      +
    428B  ILE*     4.2    13.4    -      -       +      +
    431B  PHE*     3.6    31.4    -      -       +      -
    435B  TYR*     3.2    25.4    +      -       +      -
----------------------------------------------------------
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Residues in contact with GLN 132 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    128B  MET      3.0    16.7    +      -       -      +
    129B  ALA*     3.7     8.9    +      -       -      +
    130B  MET      3.3     0.2    -      -       -      -
    131B  ALA*     1.3    75.4    -      -       -      +
    133B  ALA*     1.3    71.6    +      -       -      +
    135B  LEU*     3.3     0.6    +      -       -      -
    136B  ALA*     3.0    25.8    +      -       -      +
    147B  SER*     2.9    36.7    +      -       -      +
    148B  ASP*     3.4     3.5    +      -       -      -
    149B  ASN*     3.1    49.2    +      -       -      +
    151B  THR*     5.2     0.9    -      -       -      +
    179B  ASN*     3.9    19.4    -      -       +      +
    431B  PHE*     3.9    16.1    -      -       +      -
----------------------------------------------------------
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Residues in contact with ALA 133 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    129B  ALA      3.0    16.8    +      -       -      +
    130B  MET*     3.3     6.0    +      -       -      +
    132B  GLN*     1.3    86.3    -      -       -      +
    134B  ASN*     1.3    57.9    +      -       -      +
    136B  ALA*     3.9     3.5    -      -       -      +
    137B  ALA*     3.0    29.3    +      -       -      +
    177B  LEU*     4.8     4.7    -      -       +      -
    397B  PHE*     4.0     3.6    -      -       +      -
    407B  TYR*     3.6    39.8    -      -       +      +
----------------------------------------------------------
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Residues in contact with ASN 134 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    130B  MET      3.0    16.7    +      -       -      +
    131B  ALA*     3.7     1.8    -      -       -      +
    132B  GLN      3.2     0.2    -      -       -      -
    133B  ALA*     1.3    73.9    -      -       -      +
    135B  LEU*     1.3    57.8    +      -       -      +
    137B  ALA*     3.3     0.9    +      -       -      +
    138B  THR*     2.7    47.3    +      -       -      +
    333B  ARG*     5.1     2.6    +      -       -      -
    374B  PRO      5.5     1.0    -      -       -      +
    377B  ILE*     4.1    13.8    -      -       +      +
    397B  PHE*     4.1     6.0    -      -       +      -
    407B  TYR      3.1    18.0    +      -       -      +
    408B  SER      3.6     9.9    +      -       -      -
    409B  GLY      3.1    25.9    +      -       -      -
    410B  ARG*     4.3     2.8    -      -       -      +
    435B  TYR*     2.6    34.6    +      -       +      +
----------------------------------------------------------
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Residues in contact with LEU 135 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     58B  ILE*     4.2    17.9    -      -       +      +
    131B  ALA      2.9    14.6    +      -       -      +
    132B  GLN*     3.7     5.6    -      -       -      +
    134B  ASN*     1.3    76.0    -      -       -      +
    136B  ALA*     1.3    58.4    +      -       -      +
    138B  THR*     4.5     0.2    -      -       -      -
    139B  TYR*     2.8    62.2    +      -       +      +
    146B  LEU*     5.7     2.5    -      -       +      +
    147B  SER*     4.0    17.4    -      -       -      +
    330B  LEU*     4.2    11.9    -      -       +      -
    333B  ARG*     4.3     1.3    -      -       -      +
    431B  PHE*     3.8    24.5    -      -       +      -
    433B  ALA*     4.0    20.9    -      -       +      -
    435B  TYR*     2.9    18.0    +      -       +      +
----------------------------------------------------------
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Residues in contact with ALA 136 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    132B  GLN*     3.0    24.2    +      -       -      +
    133B  ALA*     3.9     4.7    -      -       -      +
    135B  LEU*     1.3    78.2    -      -       -      +
    137B  ALA*     1.3    59.6    +      -       -      +
    140B  ASN*     2.9    58.2    +      -       -      +
    147B  SER*     3.4    17.9    +      -       -      +
----------------------------------------------------------
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Residues in contact with ALA 137 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    133B  ALA      3.0    19.1    +      -       -      +
    134B  ASN      3.3     0.4    +      -       -      +
    136B  ALA*     1.3    77.1    -      -       -      +
    138B  THR*     1.3    60.7    +      -       -      +
    140B  ASN      5.2     2.1    -      -       -      +
    406B  ASN*     6.0     0.4    -      -       -      -
    407B  TYR*     3.5    10.8    -      -       +      +
    408B  SER*     3.5    38.4    -      -       -      +
----------------------------------------------------------
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Residues in contact with THR 138 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    134B  ASN*     2.7    41.7    +      -       -      -
    135B  LEU      3.8     2.5    -      -       -      -
    137B  ALA*     1.3    79.8    -      -       -      +
    139B  TYR*     1.3    91.3    +      -       +      +
    140B  ASN      3.9     0.7    -      -       -      -
    141B  LYS*     5.0     4.5    +      -       -      -
    326B  LEU*     4.6    14.8    -      -       +      +
    329B  GLU*     4.8     4.0    -      -       -      +
    333B  ARG*     5.1     2.7    -      -       -      +
    374B  PRO*     6.1     2.9    -      -       +      +
    408B  SER*     4.4     9.5    +      -       -      -
----------------------------------------------------------
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Residues in contact with TYR 139 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    135B  LEU*     2.8    46.7    +      -       +      +
    138B  THR*     1.3    91.5    -      -       +      +
    140B  ASN*     1.3    67.8    +      -       -      +
    141B  LYS*     3.6     3.7    -      -       -      +
    146B  LEU*     4.4    15.0    -      -       +      -
    147B  SER*     6.4     0.2    -      -       -      -
    319B  TYR*     2.8    42.4    +      -       -      +
    326B  LEU*     3.9    28.7    -      -       +      -
    329B  GLU*     2.5    31.8    +      -       +      +
    330B  LEU*     4.1    20.2    -      -       +      -
    333B  ARG*     2.8    43.7    +      -       -      -
    374B  PRO*     4.4     0.2    -      -       -      +
----------------------------------------------------------
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Residues in contact with ASN 140 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    135B  LEU      5.0     0.2    -      -       -      +
    136B  ALA*     2.9    33.5    +      -       -      +
    137B  ALA      5.2     2.1    -      -       -      +
    138B  THR      5.1     1.0    -      -       -      +
    139B  TYR*     1.3    79.6    +      -       -      +
    141B  LYS*     1.3    71.8    +      -       -      +
    144B  PHE      3.5     4.7    -      -       -      +
    145B  THR*     4.0    12.4    -      -       -      +
    146B  LEU*     2.8    31.4    +      -       -      +
    147B  SER*     2.9    33.3    +      -       -      -
----------------------------------------------------------
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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