Contacts of the helix formed by residues 327 - 350 (chain M) in PDB entry 2QJK


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 ASP 327 (chain M).
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    315M  VAL*     4.9     2.0    -      -       -      -
    319M  ASN*     4.4    12.3    -      -       -      +
    324M  GLY      3.6    10.6    +      -       -      +
    325M  ILE      2.7    15.0    +      -       -      +
    326M  ILE*     1.3    74.2    -      -       -      +
    328M  ALA*     1.3    66.0    +      -       -      +
    329M  LYS*     3.0    21.2    +      -       -      +
    330M  PHE*     3.1    12.5    +      -       -      +
    331M  PHE*     2.9    21.0    +      -       -      +
    168R  PRO*     4.0    22.9    -      -       +      +
----------------------------------------------------------
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Residues in contact with ALA 328 (chain M). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    308M  PHE      4.2    11.2    -      -       -      +
    309M  THR      3.8     6.3    -      -       -      +
    310M  ALA*     3.5    41.5    -      -       +      +
    315M  VAL*     4.2    10.7    -      -       +      +
    327M  ASP*     1.3    75.8    -      -       -      +
    329M  LYS*     1.3    64.8    +      -       -      +
    331M  PHE*     2.9     9.1    +      -       -      +
    332M  GLY*     2.7    23.0    +      -       -      -
    166R  PRO*     4.1    13.2    -      -       +      +
    168R  PRO*     6.2     0.4    -      -       +      -
----------------------------------------------------------
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Residues in contact with LYS 329 (chain M). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    164M  GLY      5.3     0.9    -      -       -      -
    167M  GLY      4.9     6.5    +      -       -      -
    168M  ALA*     4.5    24.0    -      -       +      +
    305M  LEU*     5.3     0.7    -      -       -      +
    327M  ASP*     3.0    13.2    +      -       -      +
    328M  ALA*     1.3    81.9    -      -       -      +
    330M  PHE*     1.3    61.7    -      -       +      +
    332M  GLY*     3.1     9.0    +      -       -      -
    333M  VAL*     3.1    16.0    +      -       +      +
    130R  THR      3.2    17.4    +      -       -      +
    131R  HIS*     2.6    57.7    +      -       +      +
    132R  LEU*     4.4     9.9    -      -       +      -
    166R  PRO*     4.0     9.8    +      -       -      +
    168R  PRO*     4.3    13.4    -      -       +      +
----------------------------------------------------------
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Residues in contact with PHE 330 (chain M). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    168M  ALA*     3.4    30.5    -      -       +      +
    169M  ILE*     3.9    15.0    -      -       +      -
    170M  PRO*     3.5    35.0    -      -       +      -
    325M  ILE*     4.7     3.6    -      -       +      +
    326M  ILE*     4.3    22.7    -      -       +      -
    327M  ASP*     3.1    15.8    +      -       -      +
    329M  LYS*     1.3    76.4    -      -       -      +
    331M  PHE*     1.3    60.5    +      -       -      +
    333M  VAL*     4.2    13.2    -      -       +      -
    334M  LEU*     2.8    76.6    +      -       +      +
----------------------------------------------------------
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Residues in contact with PHE 331 (chain M). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    308M  PHE*     3.3    45.3    -      +       +      -
    314M  VAL*     3.9    24.9    -      -       +      -
    315M  VAL*     3.4    23.8    -      -       +      -
    318M  ALA*     4.0    29.6    -      -       +      -
    326M  ILE*     4.0     8.5    -      -       +      +
    327M  ASP      2.9    19.7    +      -       -      +
    328M  ALA*     2.9     8.9    +      -       -      +
    330M  PHE*     1.3    75.1    -      -       -      +
    332M  GLY*     1.3    52.5    +      -       -      +
    334M  LEU*     2.9    13.5    +      -       +      +
    335M  ALA*     2.6    40.4    +      -       +      +
----------------------------------------------------------
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Residues in contact with GLY 332 (chain M). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    305M  LEU*     3.5    38.7    -      -       -      +
    308M  PHE*     4.5     4.7    -      -       -      -
    328M  ALA      2.7    16.1    +      -       -      -
    329M  LYS      3.1     4.5    +      -       -      -
    331M  PHE*     1.3    77.0    -      -       -      +
    333M  VAL*     1.3    60.6    +      -       -      +
    335M  ALA*     3.4     8.2    +      -       -      +
    336M  MET*     3.0    18.0    +      -       -      +
----------------------------------------------------------
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Residues in contact with VAL 333 (chain M). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    165M  LEU*     4.1    31.9    -      -       +      +
    168M  ALA*     3.5    25.1    -      -       +      -
    169M  ILE*     6.0     2.2    -      -       +      +
    305M  LEU*     3.8     8.7    -      -       +      +
    329M  LYS*     3.1    14.1    +      -       +      +
    330M  PHE*     3.5    18.2    -      -       +      +
    332M  GLY*     1.3    75.5    -      -       -      +
    334M  LEU*     1.3    64.3    +      -       +      +
    336M  MET*     2.9    14.4    +      -       -      +
    337M  PHE*     3.1    40.6    +      -       +      -
    131R  HIS*     6.2     0.7    -      -       -      +
    132R  LEU*     5.3     3.8    -      -       +      -
----------------------------------------------------------
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Residues in contact with LEU 334 (chain M). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    326M  ILE*     4.4    16.2    -      -       +      -
    330M  PHE*     2.8    67.5    +      -       +      +
    331M  PHE*     3.3    12.3    -      -       +      +
    333M  VAL*     1.3    74.0    -      -       +      +
    335M  ALA*     1.3    54.4    +      -       -      +
    337M  PHE*     4.3     4.2    -      -       -      +
    338M  GLY*     2.7    36.0    +      -       -      -
----------------------------------------------------------
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Residues in contact with ALA 335 (chain M). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    304M  ILE*     3.9     7.1    -      -       +      +
    308M  PHE*     3.4    37.2    -      -       +      -
    331M  PHE*     2.6    24.8    +      -       +      +
    332M  GLY      3.4     5.8    -      -       -      +
    334M  LEU*     1.3    74.3    -      -       -      +
    336M  MET*     1.3    58.1    +      -       -      +
    338M  GLY*     5.0     0.4    -      -       -      -
    339M  ALA*     2.9    25.5    +      -       -      +
    401M  PHE*     3.2    19.2    -      -       +      -
----------------------------------------------------------
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Residues in contact with MET 336 (chain M). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    165M  LEU*     3.8    22.7    -      -       +      -
    301M  PHE*     3.3    38.5    -      -       +      +
    304M  ILE*     4.1     7.8    -      -       -      +
    305M  LEU*     4.0    12.1    -      -       +      -
    332M  GLY      3.0    11.3    +      -       -      +
    333M  VAL*     2.9     8.7    +      -       -      +
    335M  ALA*     1.3    72.1    -      -       -      +
    337M  PHE*     1.3    86.1    +      -       +      +
    338M  GLY      3.0     0.9    -      -       -      -
    339M  ALA*     2.8    20.7    +      -       -      +
    340M  ILE*     3.3     9.3    +      -       -      +
    503M  SMA      3.2    60.3    -      -       -      +
----------------------------------------------------------
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Residues in contact with PHE 337 (chain M). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    137M  LEU*     5.4     6.7    -      -       +      -
    165M  LEU*     4.6    14.4    -      -       +      -
    166M  PHE*     4.6    15.5    -      +       -      -
    333M  VAL*     3.1    41.3    +      -       +      +
    334M  LEU*     4.3     3.4    -      -       -      +
    336M  MET*     1.3    93.7    -      -       +      +
    338M  GLY*     1.3    50.3    +      -       -      +
    340M  ILE*     3.1    12.9    +      -       +      +
    341M  LEU*     2.8    35.6    +      -       -      +
    503M  SMA      3.8    44.6    -      -       +      -
----------------------------------------------------------
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Residues in contact with GLY 338 (chain M). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    334M  LEU      2.7    24.7    +      -       -      -
    335M  ALA      3.8     0.7    -      -       -      -
    337M  PHE*     1.3    69.3    -      -       -      +
    339M  ALA*     1.3    64.0    +      -       -      +
    340M  ILE      2.9     2.4    +      -       -      -
    341M  LEU*     2.9    11.7    +      -       -      -
    342M  VAL*     2.8    31.2    +      -       -      +
    401M  PHE*     3.9    10.1    -      -       -      -
----------------------------------------------------------
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Residues in contact with ALA 339 (chain M). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    301M  PHE*     4.5     9.4    -      -       +      -
    304M  ILE*     3.8    20.4    -      -       +      -
    335M  ALA      2.9    14.3    +      -       -      +
    336M  MET*     2.8    12.2    +      -       -      +
    338M  GLY*     1.3    75.1    -      -       -      +
    340M  ILE*     1.3    58.7    +      -       -      +
    342M  VAL*     3.2    12.1    -      -       -      +
    343M  MET*     3.9     1.6    +      -       -      +
    400M  TRP*     2.9    37.1    +      -       -      +
    401M  PHE*     3.6    19.2    -      -       +      -
----------------------------------------------------------
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Residues in contact with ILE 340 (chain M). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    133M  MET*     3.8    22.5    -      -       +      +
    136M  TYR*     4.6     8.7    -      -       +      -
    137M  LEU*     5.1    12.8    -      -       +      -
    140M  MET*     3.9    16.8    -      -       +      -
    301M  PHE*     3.2    36.1    -      -       +      -
    336M  MET      3.7     7.6    -      -       -      +
    337M  PHE*     3.1    15.0    +      -       +      +
    338M  GLY      2.9     0.8    -      -       -      -
    339M  ALA*     1.3    75.9    -      -       -      +
    341M  LEU*     1.3    68.5    +      -       -      +
    343M  MET*     2.9    29.3    +      -       +      +
    344M  ALA      3.2     4.0    +      -       -      -
    503M  SMA      3.9    27.8    -      -       -      -
----------------------------------------------------------
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Residues in contact with LEU 341 (chain M). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    337M  PHE      2.8    19.3    +      -       -      +
    338M  GLY*     3.5    10.3    -      -       -      +
    340M  ILE*     1.3    75.0    -      -       -      +
    342M  VAL*     1.3    65.7    +      -       +      +
    344M  ALA*     2.9    19.0    +      -       +      +
    345M  LEU*     3.1    37.7    +      -       +      +
----------------------------------------------------------
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Residues in contact with VAL 342 (chain M). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    338M  GLY*     2.8    22.2    +      -       -      +
    339M  ALA*     3.2    20.6    -      -       -      +
    341M  LEU*     1.3    74.9    -      -       +      +
    343M  MET*     1.3    68.1    +      -       -      +
    345M  LEU*     2.8    33.4    +      -       +      +
    346M  VAL*     3.0    10.6    +      -       -      -
    349M  LEU*     4.7     3.3    -      -       +      +
    400M  TRP*     4.0     5.8    -      -       +      +
    401M  PHE*     4.1    20.6    -      -       +      -
    404M  PHE*     3.9    36.6    -      -       +      -
    405M  LEU*     4.3    21.8    -      -       +      -
----------------------------------------------------------
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Residues in contact with MET 343 (chain M). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    109M  TYR*     6.5     0.2    -      -       +      -
    112M  ILE*     4.2    26.5    -      -       +      -
    116M  LEU*     4.8     8.5    -      -       +      -
    129M  TRP*     3.2    18.7    +      -       +      -
    133M  MET*     4.0    21.1    -      -       +      -
    136M  TYR*     4.5    19.7    -      -       +      -
    301M  PHE*     4.7    10.5    -      -       +      -
    339M  ALA      4.1     5.8    -      -       -      +
    340M  ILE*     2.9    22.4    +      -       +      +
    342M  VAL*     1.3    80.7    -      -       -      +
    344M  ALA*     1.3    55.1    +      -       -      +
    346M  VAL*     2.9    27.2    -      -       -      +
    400M  TRP*     4.2    20.4    -      -       +      -
    404M  PHE*     4.0    24.0    -      -       +      -
----------------------------------------------------------
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Residues in contact with ALA 344 (chain M). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    129M  TRP*     3.6    15.0    +      -       -      +
    130M  ILE*     5.2     3.6    -      -       +      +
    133M  MET*     3.9    28.7    -      -       +      +
    340M  ILE      3.2     3.6    +      -       -      +
    341M  LEU*     2.9    22.3    +      -       +      +
    343M  MET*     1.3    79.1    -      -       -      +
    345M  LEU*     1.3    61.0    +      -       +      +
    346M  VAL      3.2     0.7    -      -       -      -
    347M  PRO*     3.0    16.3    -      -       -      +
    348M  TRP*     3.6     8.5    -      -       -      -
----------------------------------------------------------
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Residues in contact with LEU 345 (chain M). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    341M  LEU*     3.3    40.2    -      -       +      +
    342M  VAL*     2.8    12.6    +      -       +      +
    344M  ALA*     1.3    78.4    -      -       +      +
    346M  VAL*     1.3    51.4    +      -       -      +
    347M  PRO*     3.0     7.2    -      -       -      -
    348M  TRP*     2.6    48.2    +      -       +      +
    349M  LEU*     3.2    24.0    +      -       +      -
    405M  LEU*     6.5     0.9    -      -       +      -
----------------------------------------------------------
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Residues in contact with VAL 346 (chain M). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    116M  LEU*     4.1     5.4    -      -       +      -
    121M  TYR*     3.6    29.2    -      -       +      -
    129M  TRP*     3.4    21.3    -      -       +      +
    342M  VAL      3.0     6.0    +      -       -      -
    343M  MET      2.9    25.8    -      -       -      +
    345M  LEU*     1.3    75.7    -      -       -      +
    347M  PRO*     1.3    74.7    -      -       +      +
    348M  TRP      3.0     1.3    +      -       -      -
    349M  LEU*     3.7     8.5    -      -       -      +
    350M  ASP*     3.2    19.4    +      -       -      +
    403M  TYR*     5.8     0.2    -      -       +      -
    404M  PHE*     4.0    17.9    -      -       +      -
    408M  LEU*     3.8    21.8    -      -       +      -
----------------------------------------------------------
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Residues in contact with PRO 347 (chain M). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    121M  TYR*     3.7    33.2    -      -       +      +
    122M  LYS*     5.1     6.1    -      -       -      +
    123M  ALA      5.8     0.2    +      -       -      -
    126M  GLU*     4.2    15.4    -      -       +      +
    129M  TRP*     3.7    22.4    -      -       +      -
    344M  ALA      3.0    13.0    -      -       -      +
    345M  LEU      3.0     7.6    -      -       -      +
    346M  VAL*     1.3    96.8    -      -       +      +
    348M  TRP*     1.3    81.2    +      -       +      +
    350M  ASP*     3.8    11.8    -      -       -      +
----------------------------------------------------------
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Residues in contact with TRP 348 (chain M). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    126M  GLU*     4.4    22.8    +      -       +      +
    130M  ILE*     3.8    30.5    -      -       +      -
    344M  ALA      3.6    18.6    -      -       -      -
    345M  LEU*     2.6    50.8    +      -       +      +
    347M  PRO*     1.3    91.1    -      -       +      +
    349M  LEU*     1.3    69.5    +      -       +      +
    350M  ASP      3.3     4.0    -      -       -      +
    351M  THR*     4.7     8.0    -      -       -      +
     18P  TRP*     4.7    11.2    -      +       -      -
----------------------------------------------------------
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Residues in contact with LEU 349 (chain M). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    342M  VAL*     4.7     8.5    -      -       +      +
    345M  LEU*     3.2    27.0    +      -       +      +
    346M  VAL*     3.4     6.9    +      -       -      +
    348M  TRP*     1.3    85.7    -      -       +      +
    350M  ASP*     1.3    61.0    +      -       -      +
    351M  THR*     3.2     8.8    +      -       -      +
    404M  PHE*     2.8    43.1    -      -       +      +
    405M  LEU*     3.5    23.8    -      -       +      -
    408M  LEU*     4.3     5.8    -      -       +      -
    409M  PRO*     3.3    31.6    -      -       +      +
----------------------------------------------------------
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Residues in contact with ASP 350 (chain M). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    121M  TYR*     2.9    28.4    +      -       +      -
    122M  LYS*     3.1    23.2    -      -       +      +
    346M  VAL      3.2    16.9    +      -       -      +
    347M  PRO      3.8    12.5    -      -       -      +
    348M  TRP      4.5     1.5    -      -       -      -
    349M  LEU*     1.3    77.7    -      -       -      +
    351M  THR*     1.3    59.4    +      -       -      +
    352M  SER*     3.0    30.1    +      -       -      +
    360M  ARG*     3.1    13.6    +      -       -      -
    363M  PHE*     4.0     0.2    -      -       -      -
    408M  LEU*     3.7    26.7    -      -       +      +
----------------------------------------------------------
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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