Contacts of the helix formed by residues 462 - 491 (chain X) in PDB entry 5IJO


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 GLU 462 (chain X).
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    459X  LEU      4.7     1.2    +      -       -      -
    460X  LEU      3.2     0.6    -      -       -      -
    461X  ARG*     1.4    81.9    -      -       +      +
    463X  ILE*     1.3    77.1    -      -       -      +
    464X  LYS*     2.9     4.7    -      -       -      +
    465X  GLN*     3.3    30.5    -      -       +      +
    466X  HIS*     3.8     7.5    +      -       +      +
----------------------------------------------------------
 Back to top of page

Residues in contact with ILE 463 (chain X). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    459X  LEU      4.4     7.5    +      -       -      +
    460X  LEU*     2.6    26.4    +      -       +      +
    462X  GLU*     1.3    69.9    -      -       -      +
    464X  LYS*     1.4    61.2    +      -       -      +
    466X  HIS*     3.4     1.4    +      -       -      +
    467X  LEU*     3.1    13.9    +      -       -      +
    385Y  LEU*     5.8     8.1    -      -       +      -
    474Z  ILE*     4.0    26.8    -      -       +      +
----------------------------------------------------------
 Back to top of page

Residues in contact with LYS 464 (chain X). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
      6U  PHE*     5.3    12.4    -      -       +      +
    460X  LEU      3.9     0.6    +      -       -      -
    461X  ARG*     2.6    22.4    +      -       +      +
    462X  GLU*     2.5    10.9    -      -       +      -
    463X  ILE      1.4    69.3    -      -       -      +
    465X  GLN*     1.4    83.3    -      -       +      +
    467X  LEU*     2.8    12.1    +      -       -      +
    468X  LYS      3.7     3.0    +      -       -      -
    470Z  PRO*     5.6     0.4    +      -       -      +
    473Z  GLN*     6.1     3.9    -      -       -      +
    474Z  ILE*     4.7     5.1    -      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with GLN 465 (chain X). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    462X  GLU*     3.3    16.4    -      -       +      +
    463X  ILE      3.2     1.2    -      -       -      -
    464X  LYS*     1.4    91.2    -      -       +      +
    466X  HIS*     1.3    67.2    +      -       +      +
    468X  LYS*     2.6    27.1    +      -       -      +
    469X  GLN      3.8     0.7    +      -       -      -
----------------------------------------------------------
 Back to top of page

Residues in contact with HIS 466 (chain X). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    462X  GLU*     3.8     6.2    +      -       +      +
    463X  ILE*     3.4     6.4    +      -       -      +
    464X  LYS      3.1     2.2    +      -       -      -
    465X  GLN*     1.3    77.0    -      -       +      +
    467X  LEU*     1.3    68.8    -      -       -      +
    469X  GLN*     3.4    12.1    +      -       +      +
    470X  GLN*     3.5     7.6    +      -       -      +
    389Y  MET*     6.2     4.3    -      -       +      -
----------------------------------------------------------
 Back to top of page

Residues in contact with LEU 467 (chain X). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    463X  ILE      3.1     9.8    +      -       -      +
    464X  LYS      2.8    12.2    +      -       -      +
    466X  HIS*     1.3    83.7    -      -       -      +
    468X  LYS*     1.4    60.9    +      -       -      +
    470X  GLN*     3.0    16.2    +      -       +      +
    471X  GLN*     3.2     9.2    +      -       -      +
    474Z  ILE*     5.9     4.9    -      -       +      +
    477Z  ILE*     5.2    15.0    -      -       +      -
    478Z  LEU*     5.6     9.0    -      -       +      -
----------------------------------------------------------
 Back to top of page

Residues in contact with LYS 468 (chain X). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
      5U  GLY*     6.2     0.7    -      -       -      -
      6U  PHE*     4.8    20.2    -      -       +      +
    464X  LYS      3.7     2.8    +      -       -      -
    465X  GLN*     2.6    21.0    +      -       -      +
    467X  LEU*     1.4    47.9    -      -       -      +
    469X  GLN*     1.4    53.8    -      -       +      +
    471X  GLN*     2.8    26.5    +      -       -      +
    472X  GLU*     3.3     8.7    +      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with GLN 469 (chain X). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    465X  GLN      3.8     2.0    +      -       -      -
    466X  HIS*     3.4     8.2    +      -       +      +
    467X  LEU      2.9     1.2    -      -       -      -
    468X  LYS*     1.4    77.9    -      -       +      +
    470X  GLN*     1.4    70.1    +      -       -      +
    471X  GLN      3.0     0.9    +      -       -      -
    472X  GLU*     3.0    13.7    +      -       -      +
    473X  GLY*     3.4     7.6    +      -       -      -
----------------------------------------------------------
 Back to top of page

Residues in contact with GLN 470 (chain X). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    466X  HIS      3.5     7.6    +      -       -      +
    467X  LEU*     3.0    12.8    +      -       +      +
    469X  GLN*     1.4    79.5    -      -       -      +
    471X  GLN*     1.4    59.6    +      -       -      +
    472X  GLU      3.0     0.2    -      -       -      -
    473X  GLY*     3.3     2.5    +      -       -      +
    474X  LEU*     3.2    20.3    +      -       -      +
    392Y  ILE*     5.8     8.5    -      -       +      -
    481Z  HIS*     5.5    11.5    -      -       +      +
----------------------------------------------------------
 Back to top of page

Residues in contact with GLN 471 (chain X). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
      9U  LEU*     5.7     9.0    -      -       +      -
    467X  LEU      3.2     7.9    +      -       -      +
    468X  LYS*     2.8    19.8    +      -       -      +
    470X  GLN*     1.4    71.5    -      -       -      +
    472X  GLU*     1.3    60.7    +      -       -      +
    474X  LEU*     3.1     7.1    +      -       -      +
    475X  SER*     3.1    18.2    +      -       -      -
    481Z  HIS*     6.0     4.7    -      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with GLU 472 (chain X). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    468X  LYS      3.3     5.1    +      -       -      +
    469X  GLN*     3.0     9.2    +      -       -      +
    470X  GLN      3.0     0.8    -      -       -      -
    471X  GLN*     1.3    82.2    -      -       -      +
    473X  GLY*     1.3    67.7    +      -       -      +
    475X  SER*     3.0    13.3    +      -       -      +
    476X  HIS*     3.1    13.0    +      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with GLY 473 (chain X). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    469X  GLN      3.4     6.7    +      -       -      -
    470X  GLN*     3.3     6.7    +      -       -      -
    471X  GLN      3.2     0.4    -      -       -      -
    472X  GLU*     1.3    79.9    -      -       -      +
    474X  LEU*     1.4    64.7    +      -       -      +
    476X  HIS*     3.2     6.6    +      -       -      +
    477X  LEU*     3.1    18.4    +      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with LEU 474 (chain X). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    470X  GLN      3.2    11.0    +      -       -      +
    471X  GLN*     3.1     9.7    +      -       -      +
    472X  GLU      2.9     0.6    -      -       -      -
    473X  GLY*     1.4    79.7    -      -       -      +
    475X  SER*     1.4    63.1    +      -       -      +
    477X  LEU*     3.3     6.7    +      -       -      +
    478X  ILE*     3.1    23.2    +      -       -      +
    481Z  HIS*     5.2    11.0    -      -       +      +
    484Z  SER*     4.7    19.8    -      -       -      -
    485Z  LEU*     5.4     5.6    -      -       +      +
    488Z  ILE*     5.7     1.0    -      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with SER 475 (chain X). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    471X  GLN      3.1     8.6    +      -       -      -
    472X  GLU*     3.0    10.7    +      -       -      -
    474X  LEU*     1.4    79.4    -      -       -      +
    476X  HIS*     1.3    62.7    +      -       -      +
    478X  ILE*     3.3     5.3    +      -       -      +
    479X  SER*     3.1    22.3    +      -       -      -
----------------------------------------------------------
 Back to top of page

Residues in contact with HIS 476 (chain X). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    472X  GLU      3.1    12.5    +      -       -      +
    473X  GLY*     3.7     8.7    -      -       -      +
    474X  LEU      3.2     0.2    -      -       -      -
    475X  SER*     1.3    77.0    -      -       -      +
    477X  LEU*     1.4    63.2    +      -       -      +
    479X  SER*     3.2     4.9    +      -       -      -
    480X  ILE*     3.1    21.9    +      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with LEU 477 (chain X). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    473X  GLY      3.1    13.8    +      -       -      +
    474X  LEU*     3.3     8.4    +      -       -      +
    476X  HIS*     1.4    75.1    -      -       -      +
    478X  ILE*     1.4    62.0    +      -       -      +
    480X  ILE*     3.2     6.8    +      -       -      +
    481X  ILE*     3.0    21.7    +      -       -      +
    399Y  LEU*     6.1     4.3    -      -       +      -
    400Y  ALA*     5.9     6.7    -      -       +      +
    403Y  LEU*     5.2    12.9    -      -       +      +
    488Z  ILE*     4.6    14.3    -      -       +      +
----------------------------------------------------------
 Back to top of page

Residues in contact with ILE 478 (chain X). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    474X  LEU      3.1    14.5    +      -       -      +
    475X  SER*     4.0     5.8    -      -       -      +
    476X  HIS      3.2     0.4    -      -       -      -
    477X  LEU*     1.4    72.1    -      -       -      +
    479X  SER*     1.4    68.1    +      -       -      +
    481X  ILE*     3.1     4.8    +      -       -      +
    482X  LYS*     2.9    22.0    +      -       -      +
    484Z  SER*     5.7     6.5    -      -       -      +
    487Z  TRP*     6.5     0.7    -      -       +      -
    488Z  ILE*     4.7    16.8    -      -       +      +
----------------------------------------------------------
 Back to top of page

Residues in contact with SER 479 (chain X). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    475X  SER      3.1    13.8    +      -       -      -
    476X  HIS*     3.9     7.6    -      -       -      -
    478X  ILE*     1.4    78.3    -      -       -      +
    480X  ILE*     1.4    55.6    +      -       -      +
    482X  LYS*     3.4     5.0    +      -       -      +
    483X  ASP*     3.0    27.2    +      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with ILE 480 (chain X). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    476X  HIS      3.1    16.1    +      -       -      +
    477X  LEU*     3.2     6.7    +      -       -      +
    478X  ILE      3.1     0.2    -      -       -      -
    479X  SER*     1.4    74.8    -      -       -      +
    481X  ILE*     1.3    65.0    +      -       -      +
    483X  ASP*     3.4     6.2    +      -       -      +
    484X  ASP*     3.1    22.3    +      -       -      +
    403Y  LEU*     5.8     6.3    -      -       +      -
    407Y  HIS*     5.5     1.4    -      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with ILE 481 (chain X). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    477X  LEU      3.0    14.3    +      -       -      +
    478X  ILE*     3.1     7.1    +      -       -      +
    480X  ILE*     1.3    71.8    -      -       -      +
    482X  LYS*     1.3    70.9    +      -       -      +
    484X  ASP*     3.2     7.9    -      -       +      +
    485X  LEU*     2.9    23.2    +      -       -      +
    403Y  LEU*     5.2     9.3    -      -       +      +
    488Z  ILE*     4.9     8.3    -      -       +      +
    491Z  ASN*     5.3     6.7    -      -       +      -
    492Z  SER*     4.7    25.8    -      -       -      +
    495Z  LEU*     5.9     0.9    -      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with LYS 482 (chain X). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    478X  ILE      2.9    16.0    +      -       -      +
    479X  SER*     3.7     4.3    -      -       -      +
    481X  ILE*     1.3    81.5    -      -       -      +
    483X  ASP*     1.3    64.1    +      -       -      +
    484X  ASP      3.1     0.5    +      -       -      -
    485X  LEU*     3.4     5.1    +      -       -      +
    486X  GLU*     3.3    13.9    +      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with ASP 483 (chain X). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    479X  SER      3.0    16.9    +      -       -      +
    480X  ILE*     3.4     5.8    +      -       -      +
    481X  ILE      3.3     0.4    -      -       -      -
    482X  LYS*     1.3    57.5    -      -       -      +
    484X  ASP*     1.4    50.0    +      -       -      +
    486X  GLU*     2.8    19.7    +      -       -      +
    487X  ASP*     2.9    17.7    +      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with ASP 484 (chain X). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    480X  ILE      3.1    18.2    +      -       -      +
    481X  ILE*     3.2    12.1    -      -       +      +
    482X  LYS      3.2     0.2    -      -       -      -
    483X  ASP*     1.4    66.9    -      -       -      +
    485X  LEU*     1.3    75.8    -      -       -      +
    486X  GLU      2.9     1.7    +      -       -      -
    487X  ASP*     3.2    11.1    +      -       -      +
    488X  ILE*     3.1    15.8    +      -       -      +
    403Y  LEU*     5.1     1.3    -      -       -      +
    406Y  ILE*     4.8     8.7    -      -       +      -
    407Y  HIS*     4.2    30.7    -      -       +      +
    410Y  VAL*     3.9     6.7    -      -       -      +
    495Z  LEU*     5.3     4.3    -      -       +      -
----------------------------------------------------------
 Back to top of page

Residues in contact with LEU 485 (chain X). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    481X  ILE      2.9    11.8    +      -       -      +
    482X  LYS*     3.9     4.7    -      -       +      +
    483X  ASP      3.3     0.2    -      -       -      -
    484X  ASP*     1.3    90.4    -      -       -      +
    486X  GLU*     1.3    62.7    +      -       -      +
    488X  ILE*     3.1    16.7    -      -       +      +
    489X  LYS*     3.1    19.4    +      -       -      +
    495Z  LEU*     4.8    13.7    -      -       +      +
----------------------------------------------------------
 Back to top of page

Residues in contact with GLU 486 (chain X). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    482X  LYS      3.3     6.8    +      -       -      +
    483X  ASP*     2.8    17.7    +      -       -      +
    485X  LEU*     1.3    69.7    -      -       -      +
    487X  ASP*     1.3    77.7    -      -       -      +
    488X  ILE      2.7     2.4    +      -       -      -
    489X  LYS*     4.9     6.5    -      -       +      +
    490X  LEU*     3.2    17.8    +      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with ASP 487 (chain X). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    483X  ASP      2.9    11.9    +      -       -      +
    484X  ASP*     3.5    11.4    -      -       -      +
    486X  GLU*     1.3    66.9    -      -       -      +
    488X  ILE*     1.4    48.3    +      -       -      +
    490X  LEU*     2.8    25.9    +      -       -      +
    491X  VAL*     3.2     5.5    +      -       -      +
    407Y  HIS      5.5     1.1    -      -       -      +
    410Y  VAL*     4.0    20.2    -      -       +      -
    411Y  LYS*     5.2     4.0    -      -       +      +
    414Y  LYS*     5.4    11.6    -      -       +      +
----------------------------------------------------------
 Back to top of page

Residues in contact with ILE 488 (chain X). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    484X  ASP      3.1     6.0    +      -       -      +
    485X  LEU*     3.1    29.6    -      -       +      +
    486X  GLU      2.7     8.9    -      -       -      -
    487X  ASP*     1.4    59.9    -      -       -      +
    489X  LYS*     1.3    55.0    +      -       -      +
    490X  LEU      2.8     6.3    -      -       -      -
    491X  VAL*     2.9    27.6    +      -       +      +
    492X  GLU      3.0     7.3    +      -       -      -
    410Y  VAL*     4.3     8.6    -      -       +      +
    495Z  LEU*     5.8     5.4    -      -       +      -
    498Z  LYS*     6.5     0.9    -      -       +      -
----------------------------------------------------------
 Back to top of page

Residues in contact with LYS 489 (chain X). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    485X  LEU      3.1    13.0    +      -       -      +
    486X  GLU*     4.5     6.7    -      -       +      +
    488X  ILE*     1.3    71.1    -      -       -      +
    490X  LEU*     1.3    64.0    +      -       -      +
    492X  GLU*     2.5    36.6    +      -       +      +
----------------------------------------------------------
 Back to top of page

Residues in contact with LEU 490 (chain X). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    486X  GLU      3.2     9.2    +      -       -      +
    487X  ASP*     2.8    20.0    +      -       -      +
    488X  ILE      2.8     0.8    -      -       -      -
    489X  LYS*     1.3    86.3    -      -       -      +
    491X  VAL*     1.3    47.7    +      -       -      +
    492X  GLU*     2.9     1.0    +      -       -      +
    493X  HIS*     2.4    30.9    +      -       -      +
    414Y  LYS*     6.2     2.7    -      -       +      -
----------------------------------------------------------
 Back to top of page

Residues in contact with VAL 491 (chain X). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    487X  ASP      3.2     6.5    +      -       -      +
    488X  ILE*     2.9    23.9    +      -       +      +
    490X  LEU*     1.3    73.7    -      -       -      +
    492X  GLU*     1.2    62.3    +      -       -      +
    493X  HIS*     2.6    24.5    +      -       +      +
    410Y  VAL*     5.3     4.0    -      -       -      +
    413Y  LEU*     4.3    23.8    -      -       +      -
    414Y  LYS*     5.5     3.4    -      -       +      +
    502Z  VAL*     6.3     2.0    -      -       +      -
----------------------------------------------------------
 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