Contacts of the helix formed by residues 476 - 498 (chain S) in PDB entry 1I84


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 SER 476 (chain S).
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    474S  ILE*     3.1    12.3    +      -       -      -
    475S  ASN*     1.3    83.4    -      -       -      +
    477S  PHE*     1.3    74.2    +      -       -      +
    478S  GLU*     2.9    17.8    +      -       -      -
    479S  GLN*     3.4    17.5    +      -       -      +
    480S  LEU      3.3    11.3    +      -       -      -
    592S  TYR*     3.6     3.6    -      -       -      -
    593S  ASN*     4.5     5.3    +      -       -      +
    595S  SER      5.3     0.9    +      -       -      -
    597S  TRP*     3.8    12.7    +      -       -      +
    600S  LYS*     3.2    23.1    +      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with PHE 477 (chain S). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    476S  SER*     1.3    77.0    +      -       -      +
    478S  GLU*     1.3    63.6    +      -       +      +
    480S  LEU*     2.5    60.9    +      -       +      +
    481S  CYS*     3.1    20.4    +      -       -      -
    538S  LEU*     3.4    30.3    -      -       +      -
    541S  LEU*     4.1    10.3    -      -       +      -
    597S  TRP*     3.2    34.9    -      +       +      +
    600S  LYS*     4.8    20.4    -      -       +      -
    601S  ASN*     3.9    19.5    -      -       +      -
    659S  VAL*     3.7    28.7    -      -       +      -
    660S  GLY*     4.6     0.4    -      -       -      -
----------------------------------------------------------
 Back to top of page

Residues in contact with GLU 478 (chain S). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    273S  GLU*     4.2    26.7    -      -       +      +
    275S  SER*     2.8    31.5    +      -       -      +
    476S  SER*     2.9    24.9    +      -       -      -
    477S  PHE*     1.3    75.0    +      -       +      +
    479S  GLN*     1.3    70.5    +      -       -      +
    480S  LEU      2.9     0.9    +      -       -      -
    481S  CYS*     3.1     9.7    +      -       -      +
    482S  ILE*     2.9    37.1    +      -       +      +
    600S  LYS*     3.7    19.8    +      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with GLN 479 (chain S). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    273S  GLU*     3.8     6.8    +      -       -      +
    470S  GLU*     3.6    35.9    -      -       +      +
    472S  PHE*     4.3    13.6    -      -       +      -
    474S  ILE      3.1    22.4    +      -       -      -
    475S  ASN*     4.1    15.7    -      -       -      +
    476S  SER*     3.5    24.2    -      -       -      +
    477S  PHE      3.2     0.6    -      -       -      -
    478S  GLU*     1.3    90.8    -      -       -      +
    480S  LEU*     1.3    57.6    +      -       -      +
    482S  ILE*     3.9     8.1    -      -       -      -
    483S  ASN*     2.9    35.4    +      -       -      +
    590S  VAL*     6.1     0.2    -      -       +      -
    592S  TYR*     3.4    11.3    +      -       +      -
----------------------------------------------------------
 Back to top of page

Residues in contact with LEU 480 (chain S). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    476S  SER      3.3     2.5    +      -       -      +
    477S  PHE*     2.5    45.7    +      -       +      +
    479S  GLN*     1.3    72.9    -      -       -      +
    481S  CYS*     1.3    58.3    +      -       -      +
    483S  ASN      3.9     0.9    -      -       -      -
    484S  TYR*     3.0    26.3    +      -       -      +
    528S  ILE*     3.2    35.0    -      -       +      -
    537S  VAL*     4.2     9.2    -      -       +      -
    538S  LEU*     5.1     3.4    -      -       +      -
    583S  ILE*     3.7    17.3    -      -       +      -
    585S  HIS*     5.0     2.0    +      -       +      +
    592S  TYR*     3.2    32.8    +      -       +      +
    597S  TRP*     3.3    31.4    -      -       +      -
----------------------------------------------------------
 Back to top of page

Residues in contact with CYS 481 (chain S). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    271S  LEU*     4.0    25.8    -      -       +      -
    477S  PHE*     3.6    45.1    -      -       -      -
    478S  GLU*     3.1     7.1    +      -       -      +
    480S  LEU*     1.3    74.0    -      -       -      +
    482S  ILE*     1.3    55.1    +      -       -      +
    484S  TYR*     2.9    11.3    -      -       +      +
    485S  THR*     2.6    38.9    +      -       -      -
    528S  ILE*     5.7     0.4    -      -       -      -
    538S  LEU*     5.3     5.6    -      -       +      -
    659S  VAL*     6.0     0.9    -      -       -      -
    660S  GLY*     6.2     1.3    -      -       -      -
    663S  TYR*     4.1    14.4    -      -       +      -
----------------------------------------------------------
 Back to top of page

Residues in contact with ILE 482 (chain S). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    247S  ARG*     4.5     9.6    -      -       -      +
    248S  PHE*     6.5     0.2    -      -       -      -
    271S  LEU*     4.8    23.1    -      -       +      +
    273S  GLU*     4.9     5.2    -      -       +      +
    467S  ALA*     4.2    25.8    -      -       +      +
    468S  GLY      4.1    13.2    -      -       -      +
    470S  GLU*     3.8    38.1    -      -       +      +
    478S  GLU*     2.9    26.8    +      -       +      +
    479S  GLN*     3.9     2.2    -      -       -      +
    481S  CYS*     1.3    74.4    -      -       -      +
    483S  ASN*     1.3    76.5    +      -       -      +
    484S  TYR      2.9     8.3    +      -       -      -
    485S  THR*     3.2     7.3    +      -       -      -
    486S  ASN*     3.1    25.3    +      -       -      -
----------------------------------------------------------
 Back to top of page

Residues in contact with ASN 483 (chain S). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    469S  PHE*     3.0    47.2    -      -       +      -
    470S  GLU      2.7    29.2    +      -       -      +
    471S  ILE*     3.9     2.6    -      -       -      +
    479S  GLN*     2.9    23.7    +      -       -      +
    480S  LEU      3.9     0.7    -      -       -      -
    482S  ILE*     1.3    87.9    -      -       -      +
    484S  TYR*     1.3    59.0    +      -       -      +
    486S  ASN*     3.9    11.1    -      -       -      +
    487S  GLU*     3.3    21.3    +      -       -      +
    585S  HIS*     3.6    17.2    +      -       +      +
    590S  VAL*     4.5     2.5    -      -       -      +
    592S  TYR*     3.4    16.3    +      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with TYR 484 (chain S). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    480S  LEU      3.0    17.7    +      -       -      +
    481S  CYS*     2.9    17.3    -      -       -      +
    482S  ILE      2.9     0.4    -      -       -      -
    483S  ASN*     1.3    76.3    -      -       -      +
    485S  THR*     1.3    56.9    +      -       -      +
    487S  GLU*     2.9    12.4    +      -       +      +
    488S  LYS*     2.7    44.0    +      -       +      -
    525S  ILE*     3.5    26.7    -      -       +      -
    528S  ILE*     4.0    30.1    -      -       +      -
    529S  GLU*     2.8    35.9    +      -       +      +
    538S  LEU*     4.7    12.6    -      -       +      -
    585S  HIS*     5.2     4.5    -      -       -      -
    663S  TYR*     4.1    16.8    -      +       -      -
    664S  LYS*     4.3    17.3    -      -       +      +
    667S  LEU*     4.0    18.7    -      -       +      +
----------------------------------------------------------
 Back to top of page

Residues in contact with THR 485 (chain S). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    271S  LEU*     4.1     6.4    -      -       +      +
    466S  ILE*     4.9    20.2    -      -       +      -
    467S  ALA      5.8     0.2    -      -       -      -
    481S  CYS      2.6    20.6    +      -       -      -
    482S  ILE*     3.3     7.7    +      -       -      -
    484S  TYR*     1.3    74.0    -      -       -      +
    486S  ASN*     1.3    55.4    -      -       -      +
    488S  LYS*     2.8    12.1    +      -       +      +
    489S  LEU*     2.7    39.0    +      -       +      +
    663S  TYR*     3.0    26.5    +      -       -      +
    667S  LEU*     3.4    22.0    -      -       +      -
    670S  LEU*     5.7     0.7    -      -       +      -
    671S  MET*     5.6     4.0    -      -       +      -
----------------------------------------------------------
 Back to top of page

Residues in contact with ASN 486 (chain S). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    177S  GLY      4.4     4.9    -      -       -      +
    466S  ILE*     3.2    15.1    -      -       -      +
    467S  ALA      2.5    29.3    +      -       -      -
    468S  GLY*     3.3     4.7    -      -       -      -
    469S  PHE*     2.5    35.2    +      -       +      +
    482S  ILE      3.1    16.8    +      -       -      +
    483S  ASN*     3.9     9.4    -      -       -      +
    485S  THR*     1.3    79.5    -      -       -      +
    487S  GLU*     1.3    62.3    +      -       -      +
    489S  LEU*     3.7     5.5    +      -       -      +
    490S  GLN*     3.2    23.7    +      -       -      +
    586S  TYR*     3.5    24.1    +      -       +      +
----------------------------------------------------------
 Back to top of page

Residues in contact with GLU 487 (chain S). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    483S  ASN      3.3     8.3    +      -       -      +
    484S  TYR*     2.9    14.2    +      -       +      +
    486S  ASN*     1.3    78.8    -      -       -      +
    488S  LYS*     1.3    64.0    +      -       -      +
    491S  GLN*     3.3    16.8    +      -       -      +
    521S  LEU*     3.5    32.5    -      -       +      +
    524S  CYS*     3.3    31.1    -      -       +      +
    525S  ILE*     4.9     8.2    -      -       +      +
    584S  LEU      4.0     0.2    -      -       -      +
    585S  HIS*     2.8    41.0    +      -       +      +
    586S  TYR*     3.0    30.3    +      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with LYS 488 (chain S). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    484S  TYR*     2.7    34.6    +      -       +      +
    485S  THR*     2.8    21.9    +      -       +      +
    487S  GLU*     1.3    74.0    -      -       -      +
    489S  LEU*     1.3    64.7    +      -       -      +
    491S  GLN*     3.1    23.1    +      -       -      +
    492S  LEU*     3.3     4.9    +      -       -      +
    522S  GLN*     4.7     4.4    +      -       -      +
    525S  ILE*     4.2    21.3    -      -       +      +
    529S  GLU*     3.0    33.0    +      -       -      -
    667S  LEU*     4.5    13.0    -      -       +      -
    668S  THR*     6.2     4.5    -      -       -      -
    671S  MET*     4.3    26.0    -      -       +      +
    675S  ARG*     4.4    18.4    +      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with LEU 489 (chain S). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    174S  LEU*     4.6     9.9    -      -       +      -
    175S  CYS      5.6     3.6    -      -       -      +
    176S  THR*     4.8    17.3    -      -       +      -
    464S  LEU*     3.4    33.2    -      -       +      -
    466S  ILE*     4.3    20.9    -      -       +      -
    485S  THR*     2.7    19.2    +      -       +      +
    486S  ASN*     4.0     5.8    -      -       -      +
    488S  LYS*     1.3    72.9    -      -       -      +
    490S  GLN*     1.3    56.4    +      -       -      +
    492S  LEU*     2.6    47.7    +      -       +      +
    493S  PHE      3.3     1.0    +      -       -      -
    671S  MET*     5.2    11.8    -      -       +      +
    674S  LEU*     5.4     2.2    -      -       +      -
    681S  PHE*     4.2    24.2    -      -       +      -
----------------------------------------------------------
 Back to top of page

Residues in contact with GLN 490 (chain S). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    176S  THR*     6.1     0.7    -      -       -      -
    486S  ASN      3.2    16.1    +      -       -      +
    487S  GLU      3.8     4.7    -      -       -      +
    488S  LYS      3.3     0.2    -      -       -      -
    489S  LEU*     1.3    78.0    -      -       -      +
    491S  GLN*     1.3    55.0    +      -       -      +
    493S  PHE*     2.8    23.3    +      -       -      +
    494S  ASN*     2.4    48.3    +      -       -      +
    519S  LEU*     4.9     3.4    -      -       -      +
    521S  LEU*     3.6    17.5    -      -       +      +
    586S  TYR*     3.7    20.2    -      -       +      -
    683S  ARG*     3.3    25.3    +      -       -      +
    707S  CYS      3.5    17.1    +      -       -      +
    708S  ASN*     3.3    31.1    +      -       -      +
    709S  GLY*     4.3     2.0    -      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with GLN 491 (chain S). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    487S  GLU      3.3     9.6    +      -       -      +
    488S  LYS*     3.1    13.8    +      -       -      +
    490S  GLN*     1.3    80.6    -      -       -      +
    492S  LEU*     1.3    61.2    +      -       -      +
    494S  ASN*     3.1    17.3    +      -       -      +
    495S  HIS*     2.9    27.0    +      -       +      +
    499S  ILE*     4.4    13.9    -      -       -      +
    519S  LEU      4.3     1.2    +      -       -      -
    520S  ASP*     3.5    20.1    +      -       -      +
    521S  LEU*     2.6    41.8    +      -       +      +
    522S  GLN*     3.8    24.7    -      -       -      +
    525S  ILE*     4.3    11.7    -      -       +      -
    675S  ARG*     6.0     4.0    -      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with LEU 492 (chain S). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    174S  LEU*     4.6     5.2    -      -       +      -
    488S  LYS      3.3     3.7    +      -       -      +
    489S  LEU*     2.6    33.4    +      -       +      +
    491S  GLN*     1.3    73.1    -      -       -      +
    493S  PHE*     1.3    54.5    +      -       -      +
    495S  HIS*     3.0     8.5    +      -       +      +
    496S  THR*     2.4    53.5    +      -       +      +
    671S  MET*     4.0    18.2    -      -       -      -
    674S  LEU*     3.8    37.0    -      -       +      +
    675S  ARG*     4.6    31.4    -      -       +      +
    679S  PRO*     6.0     2.7    -      -       +      -
    681S  PHE*     4.5    10.5    -      -       +      -
----------------------------------------------------------
 Back to top of page

Residues in contact with PHE 493 (chain S). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    120S  PHE*     4.1    32.3    -      +       -      -
    176S  THR*     5.9     0.2    -      -       +      -
    489S  LEU*     3.3     2.5    +      -       +      +
    490S  GLN*     2.8    12.7    +      -       -      +
    492S  LEU*     1.3    78.5    -      -       -      +
    494S  ASN*     1.3    62.1    +      -       -      +
    496S  THR*     3.6     1.5    +      -       -      -
    497S  MET*     2.7    77.7    +      -       +      +
    498S  PHE*     4.3     6.3    -      +       -      -
    681S  PHE*     3.4    48.0    -      +       +      -
    683S  ARG*     2.9    34.1    -      -       -      +
    708S  ASN      3.5    14.4    -      -       -      -
    709S  GLY*     4.0    11.0    -      -       -      -
----------------------------------------------------------
 Back to top of page

Residues in contact with ASN 494 (chain S). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    490S  GLN*     2.4    57.2    +      -       -      +
    491S  GLN*     3.1    19.3    +      -       -      +
    493S  PHE*     1.3    76.4    -      -       -      +
    495S  HIS*     1.3    62.0    +      -       -      +
    498S  PHE*     3.0    40.4    +      -       +      -
    499S  ILE*     3.6     7.3    +      -       -      +
    519S  LEU*     3.3    50.6    -      -       -      +
    521S  LEU*     4.0     7.8    -      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with HIS 495 (chain S). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    491S  GLN*     2.9    19.4    +      -       +      +
    492S  LEU*     3.0    13.4    +      -       +      +
    494S  ASN*     1.3    76.5    -      -       -      +
    496S  THR*     1.3    59.5    +      -       -      +
    499S  ILE*     3.1    49.7    +      -       +      +
    500S  LEU*     2.8    69.9    +      -       +      +
    503S  GLU*     5.6     0.8    +      -       -      -
    522S  GLN*     5.7     3.3    +      -       -      -
    675S  ARG*     6.0     7.4    -      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with THR 496 (chain S). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    492S  LEU*     2.4    47.7    +      -       +      +
    493S  PHE*     3.6     5.4    -      -       -      -
    495S  HIS*     1.3    77.4    -      -       -      +
    497S  MET*     1.3    67.1    +      -       -      +
    500S  LEU*     3.4    27.6    -      -       +      +
    501S  GLU*     4.2    13.5    +      -       -      +
    675S  ARG*     6.2     2.7    -      -       +      -
    679S  PRO*     4.4    23.1    -      -       +      -
    681S  PHE*     4.3     7.3    -      -       -      -
----------------------------------------------------------
 Back to top of page

Residues in contact with MET 497 (chain S). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    119S  LEU*     3.5    32.5    -      -       +      -
    120S  PHE*     4.5    10.3    -      -       -      -
    493S  PHE*     2.7    61.4    +      -       +      +
    495S  HIS      3.1     0.2    -      -       -      -
    496S  THR*     1.3    86.6    -      -       -      +
    498S  PHE*     1.3    81.2    +      -       +      +
    501S  GLU*     3.8    19.9    -      -       -      +
    681S  PHE*     5.0     7.6    -      -       -      -
    713S  GLY*     4.3    10.1    -      -       -      +
    716S  ILE*     4.1    17.4    -      -       +      +
----------------------------------------------------------
 Back to top of page

Residues in contact with PHE 498 (chain S). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    493S  PHE*     4.3     5.8    -      +       -      -
    494S  ASN*     3.0    39.6    +      -       +      +
    497S  MET*     1.3    93.0    -      -       +      +
    499S  ILE*     1.3    70.9    +      -       +      +
    500S  LEU      3.7     0.2    -      -       -      -
    501S  GLU*     3.8     1.5    +      -       -      +
    502S  GLN*     3.0    31.5    +      -       -      +
    514S  PHE*     6.0     0.7    -      -       +      -
    517S  PHE*     3.4    41.1    -      +       +      -
    519S  LEU*     3.4    39.5    -      -       +      -
    709S  GLY      4.2     4.3    -      -       -      -
    712S  GLU*     3.3    36.6    -      -       +      -
    713S  GLY*     3.7    10.5    -      -       -      -
    716S  ILE*     5.1     3.6    -      -       +      -
----------------------------------------------------------
 Back to top of page


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