Contacts of the helix formed by residues 469 - 498 (chain B) in PDB entry 5MKE


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 PHE 469 (chain B).
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    466B  VAL*     3.3    11.7    -      -       +      +
    468B  THR*     1.3    94.5    +      -       -      +
    470B  ASP*     1.3    66.2    +      -       -      +
    471B  PHE      3.3     2.5    -      -       -      -
    472B  PHE*     2.9    52.9    +      +       +      +
    473B  LEU*     3.3     7.5    +      -       +      +
    331C  CYS*     4.7    16.4    -      -       -      -
    346C  ASP*     6.1     0.4    -      -       -      -
----------------------------------------------------------
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Residues in contact with ASP 470 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    464B  ARG*     2.9    15.7    -      -       -      +
    465B  TYR*     3.1    27.5    +      -       -      -
    466B  VAL*     3.0    44.4    +      -       -      +
    468B  THR      3.3     1.8    -      -       -      -
    469B  PHE*     1.3    75.2    -      -       -      +
    471B  PHE*     1.3    67.0    +      -       +      +
    473B  LEU*     2.6    20.0    +      -       -      +
    474B  ALA*     2.2    49.5    +      -       -      +
----------------------------------------------------------
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Residues in contact with PHE 471 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    465B  TYR*     6.2     2.2    -      +       -      -
    466B  VAL      4.9     5.4    -      -       -      -
    467B  THR      5.8     2.0    -      -       -      -
    468B  THR      4.4    11.2    -      -       -      +
    469B  PHE      3.3     0.8    -      -       -      -
    470B  ASP*     1.3    90.7    -      -       +      +
    472B  PHE*     1.3    64.1    +      -       +      +
    474B  ALA*     3.8    15.0    -      -       +      -
    475B  ALA*     3.1    23.5    +      -       -      +
----------------------------------------------------------
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Residues in contact with PHE 472 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    236B  ILE*     5.7     2.5    -      -       -      +
    468B  THR      5.8     0.4    -      -       -      -
    469B  PHE*     2.9    52.7    +      +       +      +
    470B  ASP      2.9     0.2    +      -       -      -
    471B  PHE*     1.3    84.5    -      -       +      +
    473B  LEU*     1.3    58.4    +      -       -      +
    475B  ALA*     3.2    19.9    -      -       -      +
    476B  CYS*     4.1     6.1    +      -       -      -
----------------------------------------------------------
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Residues in contact with LEU 473 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    236B  ILE*     6.0     3.6    -      -       +      -
    237B  LEU*     4.2    14.4    -      -       +      +
    240B  GLY*     5.7     6.1    -      -       -      +
    241B  MET*     5.6    13.7    -      -       +      +
    461B  LYS*     5.9     5.4    -      -       +      +
    464B  ARG*     3.4    37.2    -      -       +      +
    466B  VAL*     3.6    26.9    -      -       +      -
    469B  PHE*     3.3     5.5    +      -       +      +
    470B  ASP*     2.6    39.9    +      -       -      +
    472B  PHE*     1.3    73.0    -      -       -      +
    474B  ALA*     1.3    67.6    -      -       +      +
    475B  ALA      3.0     4.8    +      -       -      -
    476B  CYS*     3.6    11.4    +      -       -      -
    477B  GLU*     3.1    23.0    +      -       +      +
----------------------------------------------------------
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Residues in contact with ALA 474 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    470B  ASP*     2.2    54.6    +      -       -      +
    471B  PHE*     3.8    13.5    -      -       +      -
    473B  LEU*     1.3    67.3    -      -       +      +
    475B  ALA*     1.3    66.4    +      -       -      +
    477B  GLU*     3.6    17.7    +      -       +      +
    478B  ILE*     4.0    13.9    +      -       -      +
----------------------------------------------------------
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Residues in contact with ALA 475 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    471B  PHE      3.1    22.2    +      -       -      +
    472B  PHE*     3.2    13.5    -      -       -      +
    473B  LEU      3.0     0.6    -      -       -      -
    474B  ALA*     1.3    81.4    -      -       -      +
    476B  CYS*     1.3    62.0    +      -       +      +
    477B  GLU      3.3     0.2    +      -       -      -
    478B  ILE*     4.4     2.6    +      -       -      +
    479B  ILE*     3.1    27.0    +      -       +      +
----------------------------------------------------------
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Residues in contact with CYS 476 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    233B  VAL*     4.1    26.7    -      -       +      -
    236B  ILE*     4.5    19.7    -      -       -      -
    237B  LEU*     4.3    16.8    -      -       -      -
    472B  PHE      4.4     7.2    -      -       -      -
    473B  LEU*     3.7    12.3    -      -       -      -
    475B  ALA*     1.3    78.2    -      -       +      +
    477B  GLU*     1.3    65.6    +      -       -      +
    479B  ILE*     3.2    17.5    -      -       +      +
    480B  PHE*     3.0    24.1    +      -       -      +
----------------------------------------------------------
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Residues in contact with GLU 477 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    237B  LEU*     4.9     0.7    -      -       +      -
    464B  ARG*     3.4    39.0    +      -       +      +
    473B  LEU*     3.1    20.3    +      -       +      +
    474B  ALA*     3.6    14.4    -      -       -      +
    475B  ALA      3.2     2.0    -      -       -      -
    476B  CYS*     1.3    74.0    -      -       -      +
    478B  ILE*     1.3    89.6    +      -       -      +
    479B  ILE      2.9     6.3    +      -       -      -
    480B  PHE*     3.0    45.0    +      -       +      -
    481B  CYS*     3.8     6.2    +      -       -      +
    526B  ILE*     3.7    24.9    -      -       -      +
----------------------------------------------------------
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Residues in contact with ILE 478 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    474B  ALA      4.0    12.4    +      -       -      +
    475B  ALA      4.5     3.8    -      -       -      +
    477B  GLU*     1.3    91.8    +      -       -      +
    479B  ILE*     1.3    60.4    +      -       +      +
    481B  CYS*     3.0    36.9    -      -       -      -
    482B  PHE*     3.1    16.1    -      -       +      -
----------------------------------------------------------
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Residues in contact with ILE 479 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    233B  VAL*     6.3     1.8    -      -       +      -
    475B  ALA*     3.1    25.1    -      -       +      +
    476B  CYS*     3.2    18.4    -      -       +      +
    477B  GLU      2.9     1.2    -      -       -      -
    478B  ILE*     1.3    82.0    -      -       +      +
    480B  PHE*     1.3    70.2    +      -       +      +
    482B  PHE*     3.1    39.8    -      -       +      -
    483B  PHE*     3.3    12.4    +      -       +      +
----------------------------------------------------------
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Residues in contact with PHE 480 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    230B  PHE*     3.5    28.0    -      +       +      -
    233B  VAL*     4.4     9.6    -      -       +      -
    234B  LEU*     4.8     7.9    -      -       +      -
    237B  LEU*     3.5    29.6    -      -       +      -
    464B  ARG*     5.4     3.6    -      -       -      -
    476B  CYS      3.0    19.3    +      -       -      +
    477B  GLU*     3.0    46.2    -      -       +      -
    479B  ILE*     1.3    79.0    -      -       +      +
    481B  CYS*     1.3    67.3    +      -       +      +
    483B  PHE*     2.6    28.3    +      -       -      -
    484B  ILE*     2.9    32.8    +      -       +      +
    522B  ILE*     5.3    11.7    -      -       +      -
    525B  ASN*     6.0     4.7    -      -       -      -
----------------------------------------------------------
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Residues in contact with CYS 481 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    477B  GLU*     3.8     5.6    +      -       -      +
    478B  ILE*     3.0    51.8    -      -       -      -
    480B  PHE*     1.3    94.0    -      -       +      +
    482B  PHE*     1.3    61.8    +      -       -      +
    484B  ILE*     4.8     2.6    -      -       -      +
    485B  PHE*     3.2    20.1    +      -       -      +
    522B  ILE*     5.7    15.0    -      -       +      +
----------------------------------------------------------
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Residues in contact with PHE 482 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    478B  ILE*     3.1    28.0    -      -       +      -
    479B  ILE*     3.1    37.5    -      -       +      -
    481B  CYS*     1.3    82.5    -      -       -      +
    483B  PHE*     1.3    70.5    +      +       +      +
    485B  PHE*     3.2    23.7    -      -       +      +
    486B  TYR*     3.2    45.8    +      +       +      +
----------------------------------------------------------
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Residues in contact with PHE 483 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    226B  THR*     3.5    26.2    -      -       +      -
    230B  PHE*     3.4    44.6    -      +       +      -
    479B  ILE*     3.3    11.2    +      -       +      +
    480B  PHE*     2.6    27.6    +      -       -      +
    482B  PHE*     1.3    71.9    -      +       +      +
    484B  ILE*     1.3    63.4    +      -       +      +
    486B  TYR*     2.8    44.6    +      +       -      +
    487B  TYR*     3.2    44.0    +      +       -      -
----------------------------------------------------------
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Residues in contact with ILE 484 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    230B  PHE*     3.3    42.2    -      -       +      -
    234B  LEU*     5.6     1.1    -      -       +      -
    480B  PHE*     2.9    46.8    +      -       +      +
    481B  CYS*     4.8     2.0    -      -       -      +
    483B  PHE*     1.3    74.6    -      -       +      +
    485B  PHE*     1.3    50.7    +      -       -      +
    487B  TYR*     2.6    45.8    +      -       +      +
    488B  VAL*     2.7    25.9    +      -       +      +
    514B  ILE*     6.4     1.8    -      -       +      -
    518B  SER*     4.5    23.3    -      -       -      +
    522B  ILE*     4.5    16.4    -      -       +      -
----------------------------------------------------------
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Residues in contact with PHE 485 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    481B  CYS      3.2    19.0    +      -       -      +
    482B  PHE*     3.2    22.0    -      -       +      +
    483B  PHE      3.1     0.2    -      -       -      -
    484B  ILE*     1.3    77.8    -      -       -      +
    486B  TYR*     1.3    74.3    +      +       -      +
    488B  VAL*     3.3    31.2    +      -       +      +
    489B  VAL*     3.8    19.7    +      -       +      +
----------------------------------------------------------
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Residues in contact with TYR 486 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    482B  PHE*     3.2    48.7    +      +       +      +
    483B  PHE*     2.8    27.9    +      +       -      +
    485B  PHE*     1.3    91.6    -      +       -      +
    487B  TYR*     1.3    64.9    +      -       +      +
    488B  VAL      3.3     0.3    +      -       -      -
    489B  VAL*     3.8     1.7    +      -       -      +
    490B  GLU*     3.7    23.7    +      -       -      +
----------------------------------------------------------
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Residues in contact with TYR 487 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    223B  GLU*     4.7     6.7    -      -       +      -
    226B  THR*     2.7    34.0    +      -       -      -
    227B  TYR*     4.2    31.1    +      +       -      -
    230B  PHE*     5.0     7.0    -      +       -      -
    483B  PHE*     3.2    27.7    -      +       -      -
    484B  ILE*     2.6    40.6    +      -       +      +
    486B  TYR*     1.3    73.1    -      -       +      +
    488B  VAL*     1.3    61.8    +      -       -      +
    490B  GLU*     2.9    29.9    -      -       -      +
    491B  GLU*     2.6    29.5    -      -       -      +
    515B  VAL*     5.8     1.9    -      -       -      +
----------------------------------------------------------
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Residues in contact with VAL 488 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    484B  ILE*     2.7    30.8    +      -       +      +
    485B  PHE*     3.3    26.9    -      -       +      +
    486B  TYR      3.2     0.6    -      -       -      -
    487B  TYR*     1.3    76.4    -      -       -      +
    489B  VAL*     1.3    71.4    +      -       +      +
    491B  GLU*     4.0     1.6    +      -       -      +
    492B  ILE*     3.1    36.0    +      -       +      +
    515B  VAL*     5.4    14.3    -      -       +      +
    518B  SER*     5.9     0.2    -      -       -      +
    519B  VAL*     5.0    17.5    -      -       +      -
    522B  ILE*     6.0     2.0    -      -       +      -
----------------------------------------------------------
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Residues in contact with VAL 489 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    485B  PHE*     3.8    20.8    +      -       +      +
    486B  TYR      3.8     3.7    +      -       -      +
    487B  TYR      3.5     0.2    -      -       -      -
    488B  VAL*     1.3    86.4    -      -       +      +
    490B  GLU*     1.3    67.4    +      -       -      +
    492B  ILE*     2.8    27.1    +      -       +      +
    493B  LEU*     3.2    13.4    +      -       +      +
----------------------------------------------------------
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Residues in contact with GLU 490 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    223B  GLU*     5.4     2.1    -      -       -      +
    227B  TYR*     5.5     0.5    +      -       -      -
    486B  TYR*     3.7    16.4    +      -       -      +
    487B  TYR*     2.9    37.5    -      -       -      +
    488B  VAL      3.4     0.2    -      -       -      -
    489B  VAL*     1.3    79.9    -      -       -      +
    491B  GLU*     1.3    86.5    +      -       -      +
    493B  LEU*     3.8     8.2    +      -       -      +
    494B  GLU*     3.4    24.3    +      -       -      +
----------------------------------------------------------
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Residues in contact with GLU 491 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    227B  TYR*     5.3     4.5    +      -       -      -
    487B  TYR*     2.6    32.2    -      -       -      +
    488B  VAL      4.2     1.5    -      -       -      +
    489B  VAL      3.3     0.2    -      -       -      -
    490B  GLU*     1.3    95.2    -      -       -      +
    492B  ILE*     1.3    60.5    +      -       +      +
    493B  LEU      3.2     0.4    -      -       -      -
    494B  GLU*     2.8    42.3    +      -       +      +
    495B  ILE*     2.9    18.8    +      -       +      +
    512B  VAL*     4.9    20.4    -      -       +      -
    515B  VAL*     5.5     8.7    -      -       +      +
----------------------------------------------------------
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Residues in contact with ILE 492 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    488B  VAL*     3.1    37.0    -      -       +      +
    489B  VAL*     2.8    24.0    +      -       +      +
    491B  GLU*     1.3    76.9    -      -       -      +
    493B  LEU*     1.3    62.1    +      -       -      +
    495B  ILE*     3.1    35.5    +      -       +      +
    496B  ARG*     3.9     5.5    +      -       -      +
    515B  VAL*     5.9     6.7    -      -       +      -
----------------------------------------------------------
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Residues in contact with LEU 493 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    489B  VAL*     3.2    11.5    +      -       +      +
    490B  GLU*     3.9    10.3    -      -       -      +
    491B  GLU      3.2     0.2    -      -       -      -
    492B  ILE*     1.3    76.4    -      -       -      +
    494B  GLU*     1.3    61.5    +      -       +      +
    495B  ILE      3.1     0.7    +      -       -      -
    496B  ARG*     3.4     7.6    +      -       +      +
    497B  ILE*     3.1    45.6    +      -       +      +
----------------------------------------------------------
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Residues in contact with GLU 494 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    490B  GLU*     3.4    19.2    -      -       -      +
    491B  GLU*     2.8    32.4    +      -       +      +
    493B  LEU*     1.3    74.8    -      -       +      +
    495B  ILE*     1.3    58.0    +      -       -      +
    496B  ARG      3.5     0.2    -      -       -      -
    497B  ILE*     3.7    21.3    -      -       +      -
    498B  HIS*     3.0    35.1    +      -       +      +
    502B  TYR*     5.3     0.5    -      -       -      -
----------------------------------------------------------
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Residues in contact with ILE 495 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    491B  GLU*     2.9    15.7    +      -       +      +
    492B  ILE*     3.2    35.4    -      -       +      +
    493B  LEU      3.1     0.8    -      -       -      -
    494B  GLU*     1.3    79.5    -      -       -      +
    496B  ARG*     1.3    64.0    +      -       +      +
    498B  HIS      2.6    25.9    -      -       -      +
    499B  LYS*     3.6     7.9    +      -       +      +
    502B  TYR*     4.5    20.0    -      -       +      +
    512B  VAL*     6.3     2.9    -      -       +      -
----------------------------------------------------------
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Residues in contact with ARG 496 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    492B  ILE      3.9     4.0    +      -       -      +
    493B  LEU*     3.4    10.0    +      -       +      +
    495B  ILE*     1.3    81.6    -      -       +      +
    497B  ILE*     1.3    64.6    +      -       -      +
    498B  HIS*     4.5     1.0    -      -       -      -
    499B  LYS*     5.0     5.1    +      -       -      +
----------------------------------------------------------
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Residues in contact with ILE 497 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    493B  LEU*     3.1    46.0    +      -       +      +
    494B  GLU*     3.7    21.5    -      -       +      +
    496B  ARG*     1.3    77.6    -      -       -      +
    498B  HIS*     1.3    90.8    +      -       +      +
    499B  LYS      4.1     0.7    +      -       -      -
----------------------------------------------------------
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Residues in contact with HIS 498 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    494B  GLU*     3.0    19.4    +      -       +      +
    495B  ILE      2.6    17.5    -      -       -      +
    497B  ILE*     1.3   105.3    -      -       +      +
    499B  LYS*     1.3    58.1    +      -       -      +
    501B  HIS*     3.0    50.0    +      +       +      -
    502B  TYR*     3.0    22.7    -      -       +      +
----------------------------------------------------------
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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