Contacts of the helix formed by residues 4831 - 4856 (chain F) in PDB entry 6X34


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 ASN4831 (chain F).
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
   4829F  THR      3.4     0.4    +      -       -      -
   4830F  HIS*     1.3    96.1    +      -       +      +
   4832F  GLY*     1.3    60.7    +      -       -      +
   4833F  LYS*     3.3     3.4    -      -       -      +
   4834F  GLN*     2.9    32.8    +      -       -      +
   4835F  LEU*     3.9     6.8    +      -       -      +
   4933F  LEU*     5.6    14.6    -      -       +      +
   4937F  ALA*     5.1     5.6    -      -       +      -
----------------------------------------------------------
 Back to top of page

Residues in contact with GLY4832 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
   4828F  VAL      5.0     0.2    -      -       -      -
   4829F  THR*     3.0    18.7    +      -       -      -
   4830F  HIS      4.2     0.7    -      -       -      -
   4831F  ASN*     1.3    74.5    -      -       -      +
   4833F  LYS*     1.3    63.8    +      -       -      +
   4834F  GLN      3.2     2.7    -      -       -      -
   4835F  LEU*     3.1    26.2    +      -       -      +
   4836F  VAL*     3.3    15.2    +      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with LYS4833 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
   4831F  ASN*     3.3     1.2    -      -       -      -
   4832F  GLY*     1.3    78.6    -      -       -      +
   4834F  GLN*     1.3    65.8    +      -       -      +
   4836F  VAL*     3.3    22.2    -      -       -      +
   4837F  MET*     3.8     7.4    +      -       -      +
   4820H  THR*     4.7     4.4    -      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with GLN4834 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
   4831F  ASN*     2.9    34.2    -      -       -      +
   4833F  LYS*     1.3    84.0    +      -       -      +
   4835F  LEU*     1.3    63.6    +      -       -      +
   4837F  MET*     3.1     3.3    +      -       -      +
   4838F  THR*     3.0    26.4    +      -       +      +
   4933F  LEU*     4.9    22.7    -      -       +      +
   4820H  THR*     3.8    29.5    +      -       +      +
   4938H  PHE*     6.1     4.0    -      -       +      -
----------------------------------------------------------
 Back to top of page

Residues in contact with LEU4835 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
   4828F  VAL*     3.6    29.4    -      -       +      +
   4830F  HIS      6.0     0.2    -      -       -      +
   4831F  ASN      3.9     4.5    +      -       -      +
   4832F  GLY*     3.1    19.4    +      -       -      +
   4834F  GLN*     1.3    78.0    -      -       -      +
   4836F  VAL*     1.3    63.9    +      -       -      +
   4838F  THR*     3.3    10.4    -      -       +      +
   4839F  VAL*     3.1    47.5    +      -       +      +
   4930F  ILE*     5.6     7.6    -      -       +      -
   4933F  LEU*     6.4     3.3    -      -       +      +
   4934F  ILE*     4.1    20.2    -      -       +      -
----------------------------------------------------------
 Back to top of page

Residues in contact with VAL4836 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
   4832F  GLY      3.3     9.2    +      -       -      +
   4833F  LYS*     3.3    23.1    -      -       -      +
   4835F  LEU*     1.3    80.5    -      -       -      +
   4837F  MET*     1.3    56.9    -      -       +      +
   4839F  VAL*     4.1     5.5    -      -       +      +
   4840F  GLY*     3.0    23.0    +      -       -      -
----------------------------------------------------------
 Back to top of page

Residues in contact with MET4837 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
   4833F  LYS      3.9     6.7    -      -       -      +
   4834F  GLN      3.1     9.7    +      -       -      +
   4836F  VAL*     1.3    81.3    -      -       +      +
   4838F  THR*     1.3    54.3    +      -       -      +
   4840F  GLY*     3.2     3.2    +      -       -      -
   4841F  LEU*     2.7    38.3    +      -       +      +
   4818H  VAL*     6.1     2.2    -      -       +      -
   4820H  THR*     3.7    28.0    -      -       +      -
   4821H  LEU*     5.0    10.3    -      -       +      +
----------------------------------------------------------
 Back to top of page

Residues in contact with THR4838 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
   4834F  GLN*     3.0    20.1    +      -       +      +
   4835F  LEU*     3.3    16.6    -      -       +      +
   4837F  MET*     1.3    71.0    -      -       -      +
   4839F  VAL*     1.3    53.1    +      -       -      +
   4841F  LEU*     3.1    16.2    +      -       -      +
   4842F  LEU*     2.5    35.0    +      -       -      +
   4926F  LEU*     4.6     3.3    +      -       -      +
   4929F  ILE*     4.1    29.9    -      -       +      +
   4930F  ILE*     3.3    27.8    -      -       +      +
   4933F  LEU*     5.9     3.4    -      -       +      -
   4824H  ILE*     5.7     2.5    -      -       -      -
----------------------------------------------------------
 Back to top of page

Residues in contact with VAL4839 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
   4920D  PHE*     6.2     6.1    -      -       +      -
   4835F  LEU*     3.1    35.9    +      -       +      +
   4836F  VAL*     4.1     6.3    -      -       +      +
   4838F  THR*     1.3    77.7    -      -       -      +
   4840F  GLY*     1.3    57.8    +      -       -      +
   4842F  LEU*     3.1    17.6    +      -       +      +
   4843F  ALA*     2.9    28.5    +      -       +      +
   4885F  MET*     6.5     0.4    -      -       +      -
   4930F  ILE*     4.3    14.8    -      -       +      -
----------------------------------------------------------
 Back to top of page

Residues in contact with GLY4840 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
   4836F  VAL      3.0    17.0    +      -       -      -
   4837F  MET      3.2     3.8    +      -       -      -
   4839F  VAL*     1.3    78.1    -      -       -      +
   4841F  LEU*     1.3    59.6    +      -       -      +
   4843F  ALA*     3.2     7.3    +      -       -      +
   4844F  VAL*     3.2    29.0    +      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with LEU4841 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
   4837F  MET      2.7    20.9    +      -       -      +
   4838F  THR*     3.1    15.5    +      -       -      +
   4840F  GLY*     1.3    74.7    -      -       -      +
   4842F  LEU*     1.3    61.1    +      -       -      +
   4844F  VAL*     3.2    17.6    -      -       +      +
   4845F  VAL*     3.2    21.8    -      -       +      +
   4815H  ALA*     4.1    25.8    -      -       +      +
   4821H  LEU*     3.6    37.7    -      -       +      +
   4824H  ILE*     3.7    35.7    -      -       +      -
   4825H  LEU*     6.5     1.6    -      -       +      -
----------------------------------------------------------
 Back to top of page

Residues in contact with LEU4842 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
   4920D  PHE*     5.3     7.6    -      -       +      -
   4838F  THR*     2.5    20.2    +      -       -      +
   4839F  VAL*     3.1    17.7    +      -       +      +
   4841F  LEU*     1.3    75.0    -      -       -      +
   4843F  ALA*     1.3    61.5    +      -       +      +
   4844F  VAL      3.4     0.2    -      -       -      -
   4845F  VAL*     3.3    15.3    -      -       +      +
   4846F  VAL*     3.2    22.8    -      -       +      +
   4885F  MET*     3.7    35.2    -      -       +      -
   4889F  VAL*     5.0    12.8    -      -       +      -
   4922F  VAL*     5.4     3.4    -      -       +      +
   4926F  LEU*     4.6    22.2    -      -       +      -
   4927F  LEU*     4.7    15.7    -      -       +      -
   4930F  ILE*     4.8    15.7    -      -       +      -
----------------------------------------------------------
 Back to top of page

Residues in contact with ALA4843 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
   4839F  VAL*     2.9    15.0    +      -       +      +
   4840F  GLY*     3.2     9.3    +      -       -      +
   4842F  LEU*     1.3    82.8    -      -       +      +
   4844F  VAL*     1.3    62.9    +      -       +      +
   4845F  VAL      3.5     0.2    -      -       -      -
   4846F  VAL*     3.3    14.5    -      -       -      +
   4847F  TYR*     3.4     9.4    +      -       -      +
   4881F  TYR*     3.2    25.4    +      -       -      +
   4885F  MET*     6.0     1.3    -      -       +      -
----------------------------------------------------------
 Back to top of page

Residues in contact with VAL4844 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
   4840F  GLY      3.2    14.5    +      -       -      +
   4841F  LEU*     3.2    31.0    -      -       +      +
   4843F  ALA*     1.3    80.3    -      -       +      +
   4845F  VAL*     1.3    67.5    +      -       +      +
   4846F  VAL      3.3     0.2    -      -       -      -
   4847F  TYR*     3.1     8.9    +      -       +      +
   4848F  LEU*     3.0    32.2    +      -       +      +
   4569H  PHE*     6.2     4.7    -      -       +      -
   4811H  LEU*     4.9    19.7    -      -       +      +
   4814H  ILE*     5.7     5.2    -      -       +      -
   4815H  ALA*     4.9    10.3    -      -       +      -
----------------------------------------------------------
 Back to top of page

Residues in contact with VAL4845 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
   4841F  LEU*     3.2    21.8    -      -       +      +
   4842F  LEU*     3.3    17.5    -      -       +      +
   4844F  VAL*     1.3    83.1    -      -       +      +
   4846F  VAL*     1.3    63.7    +      -       +      +
   4848F  LEU*     3.4    14.6    +      -       +      +
   4849F  TYR*     3.1    35.1    +      -       +      -
   4922F  VAL*     4.0    24.0    -      -       +      -
   4926F  LEU*     5.8     3.6    -      -       +      -
----------------------------------------------------------
 Back to top of page

Residues in contact with VAL4846 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
   4842F  LEU*     3.2    23.8    -      -       +      +
   4843F  ALA*     3.3    17.5    -      -       -      +
   4845F  VAL*     1.3    75.5    -      -       -      +
   4847F  TYR*     1.3    53.4    +      -       -      +
   4849F  TYR*     3.4     7.9    +      -       -      +
   4850F  THR*     2.3    39.7    +      -       -      +
   4881F  TYR*     4.1    13.9    -      -       +      +
   4884F  HIS*     5.2    14.1    +      -       +      +
   4885F  MET*     4.8    19.7    -      -       +      -
   4889F  VAL*     5.4     8.1    -      -       +      -
   4918F  PHE*     4.5    14.8    -      -       +      -
   4922F  VAL*     4.4    20.0    -      -       +      -
----------------------------------------------------------
 Back to top of page

Residues in contact with TYR4847 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
   4843F  ALA      3.4    12.5    +      -       -      +
   4844F  VAL*     3.1    14.6    +      -       +      +
   4846F  VAL*     1.3    81.0    -      -       -      +
   4848F  LEU*     1.3    74.8    +      -       +      +
   4850F  THR*     3.2    16.6    +      -       +      -
   4851F  VAL*     3.3    33.0    +      -       +      +
   4881F  TYR*     4.1    23.6    -      +       +      -
   4572H  ASN*     3.1    49.2    +      -       +      +
   4575H  LEU*     4.4    12.0    -      -       -      +
   4576H  LEU*     4.8    11.2    +      -       +      -
   4808H  ALA*     4.9    11.4    -      -       +      -
   4811H  LEU*     4.9     7.9    -      -       +      -
----------------------------------------------------------
 Back to top of page

Residues in contact with LEU4848 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
   4844F  VAL*     3.0    17.8    +      -       +      +
   4845F  VAL*     3.8    13.9    -      -       +      +
   4846F  VAL      3.3     0.2    -      -       -      -
   4847F  TYR*     1.3    82.2    -      -       +      +
   4849F  TYR*     1.3    63.1    +      -       +      +
   4851F  VAL*     3.2    11.7    -      -       -      +
   4852F  VAL*     3.2    23.7    -      -       -      +
   4808H  ALA*     3.3    35.7    -      -       +      +
   4811H  LEU*     4.1    14.6    -      -       +      -
   4812H  LEU*     4.7    18.8    -      -       +      -
----------------------------------------------------------
 Back to top of page

Residues in contact with TYR4849 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
   4845F  VAL*     3.1    30.4    +      -       +      +
   4846F  VAL*     3.7     6.3    -      -       -      +
   4847F  TYR      3.3     0.4    -      -       -      -
   4848F  LEU*     1.3    79.6    -      -       +      +
   4850F  THR*     1.3    61.4    +      -       -      +
   4851F  VAL      3.5     0.2    -      -       -      -
   4852F  VAL*     3.3    19.9    -      -       +      +
   4853F  ALA*     3.5    11.6    +      -       -      +
   4884F  HIS*     4.5     6.2    +      -       -      +
   4914F  PHE*     3.5    36.9    -      +       +      -
   4917F  THR*     3.6    31.5    +      -       +      +
   4918F  PHE*     3.8    39.9    -      +       +      -
   4921F  PHE*     4.3    12.0    -      +       +      -
   4922F  VAL*     4.9     7.6    -      -       +      -
----------------------------------------------------------
 Back to top of page

Residues in contact with THR4850 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
   4846F  VAL*     2.3    27.7    +      -       -      +
   4847F  TYR*     3.5    13.7    -      -       +      -
   4848F  LEU      3.2     0.6    -      -       -      -
   4849F  TYR*     1.3    77.0    -      -       -      +
   4851F  VAL*     1.3    62.3    +      -       +      +
   4852F  VAL      3.2     0.4    -      -       -      -
   4853F  ALA*     3.2     3.5    +      -       -      +
   4854F  PHE*     3.0    27.5    +      -       +      +
   4877F  MET      4.6     5.2    -      -       -      +
   4880F  CYS*     3.9    28.1    -      -       +      +
   4881F  TYR*     3.9    28.2    -      -       +      +
   4884F  HIS*     4.0    17.2    +      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with VAL4851 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
   4847F  TYR*     3.3    36.8    +      -       +      +
   4848F  LEU      3.2    18.2    -      -       -      +
   4850F  THR*     1.3    77.0    -      -       +      +
   4852F  VAL*     1.3    62.3    +      -       +      +
   4854F  PHE*     3.5     7.2    +      -       -      +
   4855F  ASN*     3.2    34.3    +      -       -      +
   4575H  LEU*     6.6     0.2    -      -       +      -
   4805H  PHE*     3.6    25.8    -      -       +      -
   4808H  ALA*     3.8    24.7    -      -       +      -
----------------------------------------------------------
 Back to top of page

Residues in contact with VAL4852 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
   4848F  LEU      3.2    13.7    -      -       -      +
   4849F  TYR*     3.3    26.9    -      -       +      +
   4851F  VAL*     1.3    83.3    -      -       +      +
   4853F  ALA*     1.3    63.7    +      -       -      +
   4855F  ASN*     3.9     2.2    -      -       -      +
   4856F  PHE*     3.2    45.2    +      -       +      +
   4857F  PHE*     3.9     6.8    +      -       +      -
   4910F  TYR*     5.9     2.2    -      -       -      +
   4914F  PHE*     4.2    20.0    -      -       +      -
----------------------------------------------------------
 Back to top of page

Residues in contact with ALA4853 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
   4849F  TYR      3.6    14.4    -      -       -      +
   4850F  THR      3.2     6.1    +      -       -      +
   4852F  VAL*     1.3    82.0    -      -       +      +
   4854F  PHE*     1.3    60.7    +      -       -      +
   4855F  ASN      3.2     0.4    -      -       -      -
   4857F  PHE*     2.9    47.2    +      -       +      +
   4858F  ARG*     3.7     0.7    +      -       -      -
   4861F  TYR*     3.8    19.1    -      -       +      +
   4874F  CYS*     5.9     0.5    -      -       -      +
   4880F  CYS*     6.0     2.9    -      -       -      -
   4884F  HIS*     3.7    22.7    -      -       +      -
   4914F  PHE*     5.3     1.1    -      -       +      -
----------------------------------------------------------
 Back to top of page

Residues in contact with PHE4854 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
   4850F  THR*     3.0    16.6    +      -       +      +
   4851F  VAL*     3.5     6.3    +      -       -      +
   4852F  VAL      3.4     0.2    -      -       -      -
   4853F  ALA*     1.3    77.6    -      -       -      +
   4855F  ASN*     1.3    73.1    +      -       -      +
   4858F  ARG*     4.8    14.1    -      -       +      +
   4874F  CYS*     3.6    30.3    -      -       +      -
   4875F  ASP      4.7     2.9    -      -       -      -
   4877F  MET*     4.5    28.5    -      -       +      -
   4880F  CYS*     4.9    12.7    -      -       +      -
   4578H  TYR*     4.6    13.5    -      -       +      -
   4579H  LYS*     4.4    13.2    -      -       -      -
   4580H  VAL*     3.6    31.7    -      -       +      +
   4805H  PHE*     4.3    17.7    -      +       -      -
----------------------------------------------------------
 Back to top of page

Residues in contact with ASN4855 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
   4851F  VAL*     3.2    19.8    +      -       -      +
   4852F  VAL*     5.2     0.6    -      -       -      +
   4853F  ALA      3.2     0.4    -      -       -      -
   4854F  PHE*     1.3    86.4    -      -       -      +
   4856F  PHE*     1.3    89.4    +      -       +      +
   4858F  ARG*     5.5     2.5    -      -       -      +
   4804H  ASN*     5.6     6.7    -      -       -      +
   4805H  PHE*     3.2    43.2    +      -       -      -
----------------------------------------------------------
 Back to top of page

Residues in contact with PHE4856 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
   4852F  VAL*     3.2    34.4    +      -       +      +
   4855F  ASN*     1.3   101.8    -      -       +      +
   4857F  PHE*     1.3    73.4    +      +       +      +
   4858F  ARG*     2.8    15.2    +      -       -      +
   4859F  LYS*     4.6     6.6    +      -       -      +
   4860F  PHE*     5.8     0.2    -      -       -      -
   4907F  TYR*     4.7    32.2    -      +       +      -
   4910F  TYR*     4.9    22.0    -      +       +      -
----------------------------------------------------------
 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