Contacts of the helix formed by residues 422 - 448 (chain H) in PDB entry 1MKD


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 PRO 422 (chain H).
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    199H  TRP*     4.9     3.4    -      -       +      -
    200H  GLY*     3.8    23.8    -      -       -      +
    420H  THR      4.8     0.4    -      -       -      +
    421H  LYS*     1.3    89.4    -      -       +      +
    423H  LEU*     1.3    67.8    +      -       -      +
    424H  GLN*     3.2     5.6    -      -       +      +
    425H  LEU*     2.9    32.2    +      -       +      +
    426H  TYR      3.1     9.7    +      -       -      -
    495H  THR*     4.7     6.5    -      -       +      -
----------------------------------------------------------
 Back to top of page

Residues in contact with LEU 423 (chain H). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    421H  LYS      3.3     2.4    +      -       -      -
    422H  PRO*     1.3    71.1    -      -       -      +
    424H  GLN*     1.3    62.4    +      -       -      +
    426H  TYR*     4.1    13.0    -      -       +      -
    427H  ARG*     2.9    52.3    +      -       +      +
    495H  THR*     5.4     0.4    -      -       -      +
    499H  ASN*     3.5    31.5    +      -       +      +
    502H  TRP*     3.6    54.3    -      -       +      +
    503H  TYR*     4.6     0.9    -      -       +      -
----------------------------------------------------------
 Back to top of page

Residues in contact with GLN 424 (chain H). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    202H  HIS*     3.1    34.8    +      -       -      -
    205H  ARG*     4.5     6.8    +      -       -      +
    422H  PRO*     3.0     5.4    +      -       +      +
    423H  LEU*     1.3    79.5    -      -       -      +
    425H  LEU*     1.3    62.9    +      -       +      +
    427H  ARG*     3.9     7.0    +      -       -      +
    428H  GLN*     3.2    40.3    +      -       +      +
----------------------------------------------------------
 Back to top of page

Residues in contact with LEU 425 (chain H). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    200H  GLY*     3.6    26.7    -      -       -      +
    201H  LEU      3.9    11.0    -      -       -      +
    202H  HIS*     4.1    28.5    -      -       +      +
    203H  VAL*     4.7     5.2    -      -       +      +
    204H  PHE*     3.8    26.5    -      -       +      -
    421H  LYS*     4.2    13.9    -      -       +      +
    422H  PRO*     2.9    32.5    +      -       +      +
    424H  GLN*     1.3    76.5    -      -       +      +
    426H  TYR*     1.3    66.2    +      -       -      +
    428H  GLN*     2.9    19.1    +      -       -      +
    429H  TRP*     3.1    23.1    +      -       +      +
----------------------------------------------------------
 Back to top of page

Residues in contact with TYR 426 (chain H). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    418H  ASN*     3.5    19.4    +      -       +      +
    419H  PRO*     3.6    30.9    -      -       +      +
    421H  LYS      4.2     2.5    -      -       -      +
    422H  PRO      3.1     8.3    +      -       -      +
    423H  LEU*     3.6    11.4    -      -       +      +
    425H  LEU*     1.3    78.3    -      -       -      +
    427H  ARG*     1.3    57.8    +      -       -      +
    429H  TRP*     3.0     8.9    +      -       -      +
    430H  THR*     2.9    40.2    +      -       -      -
    466H  GLN*     2.7    31.5    +      -       -      +
    470H  ILE*     3.4    21.5    -      -       +      +
    499H  ASN*     3.7    28.0    -      -       +      -
    503H  TYR*     3.5    26.4    -      +       -      -
   3008H  ZAR      3.5    15.5    -      -       -      -
----------------------------------------------------------
 Back to top of page

Residues in contact with ARG 427 (chain H). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    423H  LEU*     2.9    50.1    +      -       +      +
    424H  GLN*     4.1     6.5    -      -       -      +
    426H  TYR*     1.3    75.4    -      -       -      +
    428H  GLN*     1.3    62.1    +      -       +      +
    430H  THR*     3.3     2.3    +      -       -      -
    431H  ASP*     3.0    31.8    +      -       -      +
    502H  TRP*     3.2    35.1    -      -       +      -
    503H  TYR*     3.6    20.4    +      -       +      +
----------------------------------------------------------
 Back to top of page

Residues in contact with GLN 428 (chain H). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    202H  HIS*     3.7    12.0    +      -       -      -
    204H  PHE*     3.3    38.4    -      -       +      +
    424H  GLN*     3.2    46.5    +      -       +      +
    425H  LEU*     2.9     9.0    +      -       -      +
    427H  ARG*     1.3    76.5    -      -       +      +
    429H  TRP*     1.3    63.5    +      -       -      +
    431H  ASP*     3.3    10.5    +      -       -      +
    432H  ARG*     3.1    30.9    +      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with TRP 429 (chain H). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    203H  VAL*     4.0    11.6    -      -       +      +
    204H  PHE*     3.5    31.1    -      +       -      -
    256H  TYR*     3.6    29.8    -      +       +      -
    258H  ASN*     5.3     0.7    -      -       -      -
    260H  ILE*     3.9    11.7    -      -       +      -
    261H  HIS*     3.7    37.9    -      -       +      -
    264H  ASP*     3.5    30.3    +      -       +      -
    418H  ASN*     3.5    40.5    -      -       +      +
    421H  LYS*     5.5     4.5    -      -       +      +
    425H  LEU*     3.1    33.3    +      -       +      +
    426H  TYR*     3.0     8.8    +      -       -      +
    428H  GLN*     1.3    74.2    -      -       -      +
    430H  THR*     1.3    60.5    +      -       -      +
    432H  ARG*     3.0    13.2    +      -       -      +
    433H  ILE*     2.8    27.0    +      -       -      +
   3008H  ZAR      3.3     9.8    -      -       -      -
----------------------------------------------------------
 Back to top of page

Residues in contact with THR 430 (chain H). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    426H  TYR*     2.9    32.4    +      -       -      -
    427H  ARG      3.6     4.3    -      -       -      -
    429H  TRP*     1.3    76.9    -      -       -      +
    431H  ASP*     1.3    63.9    +      -       -      +
    433H  ILE*     3.1     4.0    -      -       -      +
    434H  MET*     3.0    28.6    +      -       +      +
    462H  VAL*     3.8    20.4    -      -       +      -
    466H  GLN*     3.4    28.6    -      -       +      +
    503H  TYR*     3.2    26.1    +      -       -      +
   3008H  ZAR      3.3    11.4    -      -       -      -
----------------------------------------------------------
 Back to top of page

Residues in contact with ASP 431 (chain H). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    427H  ARG*     3.0    23.1    +      -       -      +
    428H  GLN*     3.5    10.9    -      -       -      +
    430H  THR*     1.3    79.9    -      -       -      +
    432H  ARG*     1.3    59.4    +      -       +      +
    434H  MET*     3.4     4.5    +      -       -      +
    435H  GLU*     2.9    30.8    +      -       -      +
    462H  VAL*     5.7     2.8    -      -       -      +
    503H  TYR*     5.5     0.3    +      -       -      -
----------------------------------------------------------
 Back to top of page

Residues in contact with ARG 432 (chain H). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    204H  PHE*     3.1    35.8    -      -       -      -
    255H  ALA*     2.8    56.9    +      -       +      +
    256H  TYR*     4.0     7.9    -      -       +      -
    258H  ASN*     4.0     8.7    -      -       -      +
    260H  ILE*     3.7    21.8    -      -       -      +
    428H  GLN*     3.1    19.1    +      -       -      +
    429H  TRP*     3.0    17.3    +      -       -      +
    431H  ASP*     1.3    75.2    -      -       +      +
    433H  ILE*     1.3    66.6    +      -       -      +
    435H  GLU*     3.1    10.9    +      -       -      +
    436H  GLU*     3.0    19.2    +      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with ILE 433 (chain H). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    256H  TYR*     3.6    38.5    -      -       +      -
    257H  HIS*     3.9    12.1    -      -       +      -
    429H  TRP      2.8    13.0    +      -       -      +
    430H  THR*     3.1    17.3    -      -       -      +
    432H  ARG*     1.3    72.9    -      -       -      +
    434H  MET*     1.3    70.8    +      -       +      +
    436H  GLU*     3.2     3.8    +      -       +      +
    437H  PHE*     2.9    66.3    +      -       +      -
    466H  GLN*     4.6     1.1    -      -       -      +
   3008H  ZAR      3.5    46.4    -      -       +      +
----------------------------------------------------------
 Back to top of page

Residues in contact with MET 434 (chain H). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    430H  THR*     3.0    20.4    +      -       +      +
    431H  ASP*     3.9     4.3    -      -       -      +
    433H  ILE*     1.3    86.2    -      -       +      +
    435H  GLU*     1.3    65.9    +      -       -      +
    437H  PHE*     4.2     6.5    -      -       -      -
    438H  PHE*     3.1    64.9    +      -       +      -
    454H  MET*     3.6    47.3    -      -       +      +
    460H  ALA*     4.2     6.5    -      -       +      -
    462H  VAL*     3.8    39.7    -      -       +      -
    465H  SER*     5.2     1.1    -      -       -      +
    466H  GLN*     4.8     4.9    -      -       -      -
----------------------------------------------------------
 Back to top of page

Residues in contact with GLU 435 (chain H). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    255H  ALA*     3.7    19.7    -      -       +      +
    431H  ASP      2.9    18.9    +      -       -      +
    432H  ARG*     3.1    11.9    +      -       -      +
    434H  MET*     1.3    78.7    -      -       -      +
    436H  GLU*     1.3    50.5    +      -       -      +
    438H  PHE*     4.4     6.2    -      -       -      +
    439H  PRO*     2.6    33.3    -      -       +      +
----------------------------------------------------------
 Back to top of page

Residues in contact with GLU 436 (chain H). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    254H  VAL*     3.2    15.4    -      -       +      +
    255H  ALA*     4.1     8.7    -      -       +      +
    256H  TYR*     2.8    29.9    +      -       -      +
    257H  HIS*     2.8    38.3    +      -       -      -
    301H  HIS*     4.1     0.5    -      -       -      -
    303H  GLY*     3.2    35.2    -      -       -      +
    432H  ARG      3.0    14.4    +      -       -      +
    433H  ILE*     3.6     7.6    -      -       +      +
    434H  MET      3.1     0.2    -      -       -      -
    435H  GLU*     1.3    76.6    -      -       -      +
    437H  PHE*     1.3    69.2    +      -       +      +
    438H  PHE      3.3     0.4    -      -       -      -
    439H  PRO*     3.0    13.6    -      -       -      +
    440H  GLN*     3.5    11.6    +      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with PHE 437 (chain H). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    257H  HIS*     5.3     4.9    -      +       -      -
    433H  ILE*     2.9    51.8    +      -       +      +
    434H  MET*     3.4    10.5    +      -       -      +
    436H  GLU*     1.3    82.3    -      -       +      +
    438H  PHE*     1.3    56.4    +      -       -      +
    440H  GLN*     3.1    11.4    +      -       -      +
    441H  GLY      2.9    22.5    +      -       -      -
    454H  MET*     3.7    49.4    -      -       +      +
    455H  CYS*     3.2    34.8    -      -       -      +
   3008H  ZAR      3.9    30.3    -      +       -      -
----------------------------------------------------------
 Back to top of page

Residues in contact with PHE 438 (chain H). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    434H  MET*     3.1    42.8    +      -       +      -
    435H  GLU*     4.4     4.3    -      -       -      +
    437H  PHE*     1.3    75.1    -      -       -      +
    439H  PRO*     1.4    60.3    -      -       +      +
    441H  GLY*     2.9     3.1    +      -       -      -
    442H  ASP*     2.7    41.2    +      -       -      +
    454H  MET      3.4    19.7    -      -       -      -
    455H  CYS      3.5     9.2    -      -       -      +
    457H  LYS*     3.5    49.8    -      -       +      +
    460H  ALA*     3.6    22.0    -      -       +      -
    462H  VAL*     4.8     5.8    -      -       +      -
----------------------------------------------------------
 Back to top of page

Residues in contact with PRO 439 (chain H). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    435H  GLU*     2.6    31.9    -      -       +      +
    436H  GLU*     3.0    12.1    -      -       -      +
    438H  PHE*     1.4    89.2    -      -       +      +
    440H  GLN*     1.3    55.3    +      -       -      +
    442H  ASP*     3.5    14.5    -      -       +      +
    443H  ARG*     2.8    35.8    +      -       +      +
----------------------------------------------------------
 Back to top of page

Residues in contact with GLN 440 (chain H). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    303H  GLY      4.0     4.1    +      -       -      +
    304H  VAL*     3.2    17.9    -      -       +      -
    305H  SER*     3.0    45.4    +      -       -      -
    308H  PHE*     3.8    20.9    -      -       +      +
    436H  GLU      3.5     8.7    +      -       -      +
    437H  PHE*     3.1    16.5    +      -       -      +
    438H  PHE      3.1     0.2    -      -       -      -
    439H  PRO*     1.3    75.8    -      -       -      +
    441H  GLY*     1.3    62.0    +      -       -      +
    443H  ARG*     3.1     9.5    +      -       -      +
    444H  GLU*     2.8    51.9    +      -       -      +
    452H  SER*     3.8     9.5    +      -       -      -
    455H  CYS*     4.0    14.9    -      -       -      -
----------------------------------------------------------
 Back to top of page

Residues in contact with GLY 441 (chain H). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    437H  PHE      2.9     7.7    +      -       -      -
    438H  PHE      2.9     3.6    +      -       -      -
    440H  GLN*     1.3    77.7    -      -       -      +
    442H  ASP*     1.3    57.4    +      -       -      +
    444H  GLU*     3.2    14.4    +      -       -      -
    445H  ARG*     2.9    27.5    +      -       -      +
    451H  ILE*     3.1    16.3    -      -       -      +
    455H  CYS*     3.2    25.8    -      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with ASP 442 (chain H). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    438H  PHE*     2.7    21.9    +      -       -      +
    439H  PRO*     3.5    16.8    -      -       +      +
    441H  GLY*     1.3    70.3    -      -       -      +
    443H  ARG*     1.3    65.8    +      -       -      +
    445H  ARG*     2.8    39.3    +      -       -      +
    446H  GLU*     2.9    26.0    +      -       +      +
    457H  LYS*     3.0    36.3    +      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with ARG 443 (chain H). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    302H  PRO      5.4     3.8    +      -       -      -
    304H  VAL*     3.7    18.4    -      -       -      +
    308H  PHE*     3.3    35.5    -      -       +      -
    439H  PRO*     2.8    25.5    +      -       +      +
    440H  GLN*     3.2    12.6    -      -       -      +
    442H  ASP*     1.3    77.2    -      -       -      +
    444H  GLU*     1.3    56.7    +      -       -      +
    446H  GLU*     3.3    19.2    +      -       -      +
    447H  ARG*     3.0    62.2    +      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with GLU 444 (chain H). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    308H  PHE*     3.6    24.0    -      -       +      +
    311H  ASN*     5.7     1.2    +      -       -      -
    440H  GLN*     2.8    32.1    +      -       -      +
    441H  GLY*     3.5    14.2    -      -       -      +
    443H  ARG*     1.3    74.7    -      -       -      +
    445H  ARG*     1.3    64.7    +      -       -      +
    447H  ARG*     3.4     3.4    +      -       -      -
    448H  GLY      3.0     2.6    +      -       -      -
    449H  MET*     2.8    54.0    +      -       +      +
    450H  GLU      4.1     5.4    -      -       -      +
    451H  ILE*     3.6     9.6    -      -       +      -
    452H  SER*     2.6    51.0    +      -       -      -
    455H  CYS*     4.2     0.7    -      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with ARG 445 (chain H). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    441H  GLY      2.9    13.9    +      -       -      +
    442H  ASP*     2.8    39.2    +      -       -      +
    444H  GLU*     1.3    77.7    -      -       -      +
    446H  GLU*     1.3    63.9    +      -       +      +
    448H  GLY*     3.1    12.3    +      -       -      -
    449H  MET      4.6     1.6    -      -       -      -
    451H  ILE*     3.3    17.0    -      -       +      +
    456H  ASP*     3.0    29.3    +      -       -      +
    457H  LYS*     3.8    14.5    -      -       -      +
    458H  HIS*     3.8    27.5    +      -       -      -
----------------------------------------------------------
 Back to top of page

Residues in contact with GLU 446 (chain H). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    442H  ASP*     2.9    27.3    +      -       +      +
    443H  ARG*     3.3    26.6    +      -       -      +
    445H  ARG*     1.3    75.7    -      -       +      +
    447H  ARG*     1.3    67.1    +      -       -      +
    448H  GLY*     2.9    10.2    +      -       -      -
----------------------------------------------------------
 Back to top of page

Residues in contact with ARG 447 (chain H). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    308H  PHE*     4.1     7.6    -      -       +      -
    312H  THR*     4.1    17.4    -      -       +      +
    443H  ARG*     3.0    61.9    +      -       -      +
    444H  GLU      3.7     0.9    -      -       -      +
    446H  GLU*     1.3    84.0    +      -       -      +
    448H  GLY*     1.3    58.5    +      -       -      +
    449H  MET*     3.1    37.9    +      -       +      +
----------------------------------------------------------
 Back to top of page

Residues in contact with GLY 448 (chain H). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    444H  GLU      3.0     2.8    +      -       -      -
    445H  ARG      3.1    11.2    +      -       -      -
    446H  GLU      2.9     6.7    +      -       -      -
    447H  ARG*     1.3    80.2    -      -       -      +
    449H  MET*     1.3    64.1    +      -       -      +
----------------------------------------------------------
 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