Contacts of the helix formed by residues 276 - 298 (chain P) in PDB entry 1HI0


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 276 (chain P).
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    151P  THR      4.0     0.9    -      -       -      +
    153P  ILE*     3.3    27.6    -      -       +      +
    190P  TYR*     5.7     0.2    -      -       +      -
    194P  GLN      4.3     9.4    -      -       -      +
    196P  GLY      3.3    26.7    -      -       -      +
    198P  ALA      3.4    21.1    -      -       -      +
    199P  TYR*     4.6     4.3    -      -       +      -
    274P  GLY      3.9     0.2    -      -       -      -
    275P  GLY*     1.3    78.9    -      -       -      +
    277P  PHE*     1.3    66.3    +      -       -      +
    278P  ALA      3.4     1.8    -      -       -      -
    279P  LEU*     3.1    24.7    +      -       +      -
    280P  ASN*     3.1    12.4    +      -       -      +
    363P  LEU*     4.0    15.3    -      -       +      -
----------------------------------------------------------
 Back to top of page

Residues in contact with PHE 277 (chain P). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
      6D    C      5.1    10.3    -      -       -      -
    143P  LEU*     5.5     1.6    -      -       +      -
    145P  ILE*     4.0    32.1    -      -       +      -
    150P  SER      5.6     1.6    -      -       -      -
    151P  THR*     3.2    45.0    +      -       +      +
    153P  ILE      4.0     2.4    +      -       -      -
    163P  LYS*     3.8    26.7    -      -       +      -
    166P  ILE*     3.3    23.8    -      -       +      -
    167P  ALA*     4.0    13.7    -      -       +      -
    275P  GLY      3.2     3.7    +      -       -      +
    276P  PRO*     1.3    69.1    -      -       -      +
    278P  ALA*     1.3    66.1    +      -       -      +
    280P  ASN*     3.1     6.2    +      -       +      +
    281P  ALA*     2.9    29.9    +      -       +      +
    284P  MET*     4.0    29.8    -      -       +      -
----------------------------------------------------------
 Back to top of page

Residues in contact with ALA 278 (chain P). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    153P  ILE      5.4     0.6    +      -       -      -
    166P  ILE*     4.4    14.2    -      -       +      +
    170P  ALA*     3.3    19.5    -      -       +      +
    193P  HIS      3.2    27.8    -      -       -      +
    194P  GLN*     3.2    23.1    +      -       +      +
    195P  MET*     3.4    10.7    -      -       +      +
    276P  PRO      3.4     0.8    +      -       -      -
    277P  PHE*     1.3    77.8    -      -       -      +
    279P  LEU*     1.3    56.0    +      -       -      +
    282P  PRO*     3.0    20.6    -      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with LEU 279 (chain P). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    181P  MET*     4.5     3.6    -      -       +      -
    194P  GLN      4.4     0.2    +      -       -      -
    195P  MET*     4.0    17.5    -      -       +      +
    196P  GLY*     4.1    16.4    -      -       -      +
    199P  TYR*     5.7     0.9    -      -       -      +
    276P  PRO*     3.1    25.7    +      -       +      +
    277P  PHE      3.0     0.2    -      -       -      -
    278P  ALA*     1.3    76.9    -      -       -      +
    280P  ASN*     1.3    67.1    +      -       -      +
    281P  ALA      3.2     1.8    -      -       -      -
    282P  PRO*     3.0    18.2    -      -       +      +
    283P  ILE*     3.6     9.2    -      -       +      +
    356P  LEU*     4.0    43.7    -      -       +      +
    359P  THR*     5.0     2.5    -      -       +      -
    360P  SER*     4.0    30.3    -      -       -      +
    363P  LEU*     4.4    12.8    -      -       +      -
----------------------------------------------------------
 Back to top of page

Residues in contact with ASN 280 (chain P). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
      6D    C      6.2     0.9    -      -       -      -
    199P  TYR*     4.2     5.1    +      -       -      -
    275P  GLY*     3.2    37.5    +      -       -      +
    276P  PRO*     3.1     5.3    +      -       -      +
    277P  PHE*     3.1    10.1    +      -       +      +
    279P  LEU*     1.3    78.6    -      -       -      +
    281P  ALA*     1.3    52.0    +      -       -      +
    283P  ILE*     3.1    11.6    +      -       -      +
    284P  MET*     2.6    52.8    +      -       -      +
    360P  SER*     4.9     1.8    -      -       -      -
    394P  GLY      3.4    12.6    -      -       -      +
    395P  GLN*     3.4    14.5    -      -       -      +
    396P  GLY      3.1    24.5    -      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with ALA 281 (chain P). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    143P  LEU*     4.1    15.4    -      -       +      +
    167P  ALA*     4.2    18.2    -      -       +      +
    170P  ALA*     3.9    15.7    -      -       +      -
    171P  LEU*     4.3     3.8    -      -       +      -
    277P  PHE*     2.9    20.9    +      -       +      +
    280P  ASN*     1.3    75.6    -      -       -      +
    282P  PRO*     1.3    71.9    -      -       +      +
    284P  MET*     3.0    12.8    +      -       -      +
    285P  ALA*     2.9    23.4    +      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with PRO 282 (chain P). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    170P  ALA*     4.1     6.1    -      -       +      -
    171P  LEU*     3.7     7.2    -      -       +      -
    174P  ALA*     3.8    21.5    -      -       +      -
    195P  MET*     4.6     1.8    -      -       +      -
    278P  ALA      3.0    20.6    -      -       -      +
    279P  LEU*     3.0    17.9    -      -       +      +
    281P  ALA*     1.3    93.8    -      -       +      +
    283P  ILE*     1.3    58.9    +      -       +      +
    285P  ALA*     3.6     4.2    -      -       -      +
    286P  VAL*     3.6     2.8    -      -       -      +
    353P  TRP*     3.1    19.9    +      -       -      +
    356P  LEU*     4.4    15.9    -      -       +      -
    657P  PHE*     3.5    33.6    -      -       +      -
----------------------------------------------------------
 Back to top of page

Residues in contact with ILE 283 (chain P). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    279P  LEU*     3.6    21.1    -      -       +      +
    280P  ASN*     3.1    16.4    +      -       -      +
    281P  ALA      3.0     0.4    -      -       -      -
    282P  PRO*     1.3    77.4    -      -       +      +
    284P  MET*     1.3    66.1    +      -       -      +
    285P  ALA      3.1     1.6    -      -       -      -
    286P  VAL*     3.0     5.5    +      -       -      +
    287P  ALA*     2.9    19.8    +      -       -      +
    353P  TRP*     4.2    10.0    -      -       +      +
    356P  LEU*     4.4     3.8    -      -       +      +
    357P  PHE*     4.1    38.6    -      -       +      +
    360P  SER*     3.4    36.8    -      -       -      +
    395P  GLN*     4.1     5.8    -      -       -      +
    396P  GLY*     3.8    24.5    -      -       -      -
    397P  ALA*     4.2     3.4    -      -       +      +
----------------------------------------------------------
 Back to top of page

Residues in contact with MET 284 (chain P). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
      6D    C      4.7    28.5    -      -       -      +
    143P  LEU*     3.6    31.4    -      -       +      -
    144P  LYS      3.8    11.7    -      -       -      +
    145P  ILE*     5.2     2.9    -      -       +      -
    277P  PHE*     4.0    23.6    -      -       +      -
    280P  ASN*     2.6    36.6    +      -       -      +
    281P  ALA*     3.6     4.5    -      -       -      +
    283P  ILE*     1.3    72.1    -      -       -      +
    285P  ALA*     1.3    61.9    -      -       -      +
    286P  VAL      3.0     1.2    +      -       -      -
    287P  ALA*     3.9     7.9    -      -       -      -
    288P  GLN*     3.1    27.0    +      -       -      +
    291P  ARG*     5.1     0.6    +      -       -      +
    396P  GLY*     3.9    21.5    -      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with ALA 285 (chain P). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    141P  VAL*     5.3     4.5    +      -       -      +
    143P  LEU*     4.4    14.3    -      -       +      +
    171P  LEU*     4.1    11.0    -      -       +      -
    281P  ALA      2.9    15.2    +      -       -      +
    282P  PRO      3.6     0.4    -      -       -      +
    283P  ILE      3.1     0.2    -      -       -      -
    284P  MET*     1.3    76.7    -      -       -      +
    286P  VAL*     1.3    58.1    +      -       -      +
    288P  GLN*     5.6     0.4    -      -       -      -
    289P  PRO*     3.2    20.8    -      -       -      +
    654P  THR*     5.2     7.9    -      -       -      -
    657P  PHE*     3.5    34.1    -      -       +      -
    658P  LEU*     3.4     9.7    -      -       +      +
----------------------------------------------------------
 Back to top of page

Residues in contact with VAL 286 (chain P). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    135P  PHE*     4.5     9.9    -      -       +      -
    138P  LEU*     4.4    11.7    -      -       +      -
    282P  PRO      3.6     3.6    -      -       -      +
    283P  ILE      3.0     1.6    +      -       -      +
    285P  ALA*     1.3    77.0    -      -       -      +
    287P  ALA*     1.3    67.6    +      -       -      +
    288P  GLN      3.3     1.3    -      -       -      -
    289P  PRO*     3.0    13.7    -      -       -      +
    290P  VAL*     3.1    25.6    +      -       +      +
    349P  TYR*     4.5     7.9    -      -       +      -
    353P  TRP*     3.3    53.2    -      -       +      +
    657P  PHE*     4.4     2.7    -      -       +      -
    658P  LEU*     3.9    17.9    -      -       +      -
    661P  VAL*     4.2     9.9    -      -       +      -
    662P  MET*     5.8     0.4    -      -       +      -
----------------------------------------------------------
 Back to top of page

Residues in contact with ALA 287 (chain P). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    135P  PHE*     6.2     0.7    -      -       -      -
    283P  ILE      2.9    16.3    +      -       -      +
    284P  MET*     3.7     4.9    -      -       -      +
    286P  VAL*     1.3    78.5    -      -       -      +
    288P  GLN*     1.3    56.7    +      -       -      +
    290P  VAL*     3.0     8.1    +      -       -      +
    291P  ARG*     2.8    43.0    +      -       -      +
    396P  GLY      3.6    23.8    -      -       -      +
    397P  ALA*     4.1    14.4    -      -       +      -
    400P  LEU*     3.6     9.6    -      -       +      +
----------------------------------------------------------
 Back to top of page

Residues in contact with GLN 288 (chain P). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    141P  VAL*     3.8    19.5    -      -       +      -
    142P  PRO      5.1     5.4    -      -       -      +
    143P  LEU*     6.4     1.3    -      -       -      -
    144P  LYS*     6.4     1.3    -      -       +      +
    284P  MET      3.1    10.2    +      -       -      +
    285P  ALA*     5.6     0.2    -      -       -      -
    287P  ALA*     1.3    79.1    -      -       -      +
    289P  PRO*     1.3    71.3    -      -       +      +
    291P  ARG*     2.9    46.2    +      -       -      +
    292P  ASN*     2.9    40.0    +      -       -      +
    295P  TYR*     5.8     0.2    -      -       -      -
    633P  THR*     5.0     7.9    +      -       -      -
    634P  GLU*     5.3    14.7    +      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with PRO 289 (chain P). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    138P  LEU*     3.6    30.9    -      -       +      +
    139P  GLU      3.7    17.6    +      -       -      +
    141P  VAL*     3.7    17.7    -      -       +      +
    285P  ALA*     3.2    23.3    -      -       -      +
    286P  VAL*     3.0    18.4    -      -       -      +
    288P  GLN*     1.3    90.7    -      -       +      +
    290P  VAL*     1.3    61.6    +      -       -      +
    292P  ASN*     3.3    12.4    +      -       -      +
    293P  LYS*     3.1    18.5    +      -       -      +
    658P  LEU*     4.3    10.5    -      -       +      -
----------------------------------------------------------
 Back to top of page

Residues in contact with VAL 290 (chain P). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    134P  MET*     3.7    31.6    -      -       +      +
    135P  PHE*     3.8    31.0    -      -       +      -
    138P  LEU*     3.8    24.7    -      -       +      -
    286P  VAL*     3.1    18.2    +      -       +      +
    287P  ALA*     3.0     9.3    +      -       -      +
    289P  PRO*     1.3    75.2    -      -       -      +
    291P  ARG*     1.3    64.2    +      -       -      +
    293P  LYS*     3.1     4.2    +      -       -      +
    294P  ILE*     3.1    23.8    +      -       +      +
    400P  LEU*     3.7    26.5    -      -       +      -
----------------------------------------------------------
 Back to top of page

Residues in contact with ARG 291 (chain P). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
      6D    C      4.4    10.3    +      -       -      -
    284P  MET*     5.1     0.4    +      -       -      +
    287P  ALA*     2.8    17.2    +      -       -      +
    288P  GLN*     3.1    58.6    +      -       -      +
    290P  VAL*     1.3    76.9    -      -       -      +
    292P  ASN*     1.3    63.9    +      -       -      +
    294P  ILE*     3.5     6.6    +      -       -      +
    295P  TYR*     2.9    53.9    +      -       +      -
    396P  GLY      3.3    23.0    +      -       -      -
    397P  ALA*     4.3     0.2    -      -       -      +
    399P  ASP*     2.7    38.8    +      -       -      -
    400P  LEU*     4.2    14.4    -      -       +      -
    633P  THR*     5.3     2.5    -      -       -      -
----------------------------------------------------------
 Back to top of page

Residues in contact with ASN 292 (chain P). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    139P  GLU      4.9     1.0    +      -       -      -
    141P  VAL*     3.7    27.3    -      -       -      +
    288P  GLN*     2.9    42.3    +      -       -      +
    289P  PRO*     3.6    13.8    -      -       +      +
    291P  ARG*     1.3    74.5    -      -       -      +
    293P  LYS*     1.3    54.8    +      -       -      +
    295P  TYR*     3.8     5.8    -      -       -      +
    296P  SER*     2.6    36.0    +      -       -      -
    633P  THR*     5.7     0.2    +      -       -      -
----------------------------------------------------------
 Back to top of page

Residues in contact with LYS 293 (chain P). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    133P  LEU      3.1    21.1    +      -       -      +
    134P  MET      4.1     3.1    -      -       -      +
    136P  SER*     2.4    30.5    +      -       -      +
    137P  ASP*     2.7    42.4    +      -       -      +
    138P  LEU*     4.0    13.9    -      -       +      -
    289P  PRO      3.1    13.7    +      -       -      +
    290P  VAL      3.1     8.0    +      -       -      +
    292P  ASN*     1.3    77.2    -      -       -      +
    294P  ILE*     1.3    65.3    +      -       +      +
    296P  SER*     2.7    20.6    +      -       -      +
    297P  LYS*     2.9    40.9    +      -       +      +
    298P  TYR*     4.7     4.5    -      -       +      -
----------------------------------------------------------
 Back to top of page

Residues in contact with ILE 294 (chain P). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    134P  MET*     3.9    51.8    -      -       +      -
    290P  VAL*     3.1    12.4    +      -       +      +
    291P  ARG      3.5     9.9    -      -       -      +
    293P  LYS*     1.3    77.7    -      -       +      +
    295P  TYR*     1.3    74.3    -      -       +      +
    298P  TYR*     3.0    49.7    +      -       +      +
    302P  PHE*     3.7    31.5    -      -       +      +
    400P  LEU*     4.0    18.2    -      -       +      -
    403P  THR*     5.0     4.3    -      -       +      +
    440P  TRP*     5.3     0.2    -      -       +      -
----------------------------------------------------------
 Back to top of page

Residues in contact with TYR 295 (chain P). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    288P  GLN*     5.8     0.2    -      -       -      -
    291P  ARG*     2.9    47.7    +      -       +      +
    292P  ASN*     4.0     6.3    -      -       -      +
    294P  ILE*     1.3    86.5    -      -       +      +
    296P  SER*     1.3    57.8    +      -       -      +
    299P  ALA*     3.1    22.2    -      -       -      +
    302P  PHE*     3.5    37.2    -      -       +      -
    303P  HIS*     3.2    30.7    +      +       +      +
    399P  ASP*     4.1    12.1    +      -       -      -
    400P  LEU*     5.7     0.9    -      -       +      +
    451P  LYS*     3.1    32.7    +      -       +      +
    633P  THR*     3.8    29.2    -      -       +      -
----------------------------------------------------------
 Back to top of page

Residues in contact with SER 296 (chain P). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    292P  ASN      2.6    23.9    +      -       -      -
    293P  LYS*     2.7    16.5    +      -       -      -
    295P  TYR*     1.3    75.3    -      -       -      +
    297P  LYS*     1.3    68.0    +      -       -      +
    298P  TYR      3.1     0.4    -      -       -      -
    299P  ALA*     2.9    22.1    +      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with LYS 297 (chain P). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    133P  LEU*     5.5     1.8    -      -       -      +
    137P  ASP*     5.8     1.4    +      -       -      -
    293P  LYS*     2.9    27.9    +      -       +      +
    296P  SER*     1.3    80.9    +      -       -      +
    298P  TYR*     1.3   101.3    +      -       +      +
    299P  ALA      3.7     0.9    +      -       -      -
    437P  ASP*     3.4    14.2    +      -       -      -
    441P  GLN*     3.9    21.4    -      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with TYR 298 (chain P). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    133P  LEU*     3.4    41.7    +      -       +      +
    293P  LYS*     4.6     4.6    -      -       +      -
    294P  ILE*     3.0    32.8    +      -       +      +
    297P  LYS*     1.3   113.0    +      -       +      +
    299P  ALA*     1.3    64.8    +      -       -      +
    300P  TYR      3.0     4.9    +      -       -      +
    301P  THR*     3.1     4.2    +      -       -      -
    302P  PHE*     3.1    31.0    +      -       +      +
    437P  ASP*     2.8    43.4    +      -       -      -
    440P  TRP*     3.5    42.2    -      +       +      -
    441P  GLN*     4.0     8.7    -      -       +      -
----------------------------------------------------------
 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