Contacts of the helix formed by residues 70 - 96 (chain F) in PDB entry 6C3P


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 GLY 70 (chain F).
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     69F  PRO*     1.3    76.0    -      -       -      +
     71F  HIS*     1.3    68.7    +      -       -      +
     72F  ASN      3.5     1.6    -      -       -      -
     73F  LEU*     3.9     8.8    +      -       -      +
     74F  ARG*     3.3    24.2    +      -       -      +
    185F  VAL*     4.5     6.8    -      -       -      +
    188F  ASN*     6.5     0.9    -      -       -      -
----------------------------------------------------------
 Back to top of page

Residues in contact with HIS 71 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     68F  PHE*     3.8    11.1    +      -       +      +
     69F  PRO      3.5     1.6    -      -       -      -
     70F  GLY*     1.3    79.3    -      -       -      +
     72F  ASN*     1.3    68.6    +      -       +      +
     74F  ARG*     3.1     2.3    +      -       -      +
     75F  TRP*     2.8    63.2    +      +       -      +
    124F  TYR*     5.8     3.8    -      -       -      -
    222F  VAL      5.7     0.2    -      -       -      -
    223F  ASN*     4.4     8.7    -      -       +      -
    224F  LEU*     3.4    42.9    +      -       +      +
    227F  LYS*     5.7     1.7    -      -       +      +
----------------------------------------------------------
 Back to top of page

Residues in contact with ASN 72 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     70F  GLY      3.5     0.2    -      -       -      -
     71F  HIS*     1.3    86.7    -      -       +      +
     73F  LEU*     1.3    58.5    +      -       -      +
     75F  TRP*     3.3     1.9    +      -       -      +
     76F  ILE*     2.9    30.9    +      -       -      +
    224F  LEU*     4.7    14.8    -      -       +      +
----------------------------------------------------------
 Back to top of page

Residues in contact with LEU 73 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     70F  GLY*     3.9    11.0    +      -       -      +
     71F  HIS      3.3     0.6    -      -       -      -
     72F  ASN*     1.3    77.9    -      -       -      +
     74F  ARG*     1.3    65.6    +      -       -      +
     76F  ILE*     3.2     7.0    +      -       -      +
     77F  LEU*     2.9    30.4    +      -       +      +
    185F  VAL*     4.7    12.1    -      -       +      -
----------------------------------------------------------
 Back to top of page

Residues in contact with ARG 74 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     68F  PHE      6.0     0.2    -      -       -      -
     69F  PRO      4.9     5.9    +      -       -      -
     70F  GLY      3.3    17.8    +      -       -      +
     71F  HIS*     3.1     5.5    +      -       -      +
     73F  LEU*     1.3    77.3    -      -       -      +
     75F  TRP*     1.3    69.6    +      -       +      +
     77F  LEU*     3.3     6.8    +      -       -      +
     78F  THR*     2.8    38.4    +      -       -      +
    124F  TYR*     3.1    57.5    +      -       -      -
    182F  LEU*     4.4    13.6    -      -       +      +
    185F  VAL*     3.5    32.6    -      -       +      +
    186F  GLU*     3.9    11.4    +      -       -      -
    189F  VAL*     3.5    35.2    -      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with TRP 75 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     71F  HIS*     2.8    74.3    +      +       -      +
     72F  ASN      3.9     3.1    -      -       -      +
     74F  ARG*     1.3    86.7    -      -       +      +
     76F  ILE*     1.3    67.7    +      -       -      +
     78F  THR*     3.7     8.6    -      -       -      -
     79F  PHE*     2.9    64.8    +      +       +      -
    121F  VAL*     3.5    47.1    -      -       +      -
    124F  TYR*     4.9    19.3    -      +       -      -
    125F  HIS*     5.2     7.9    -      +       +      -
    223F  ASN*     4.8    17.0    -      -       +      -
    224F  LEU*     4.5    17.3    -      -       +      -
    225F  LEU*     5.2     9.9    -      -       +      -
----------------------------------------------------------
 Back to top of page

Residues in contact with ILE 76 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     72F  ASN      2.9    17.2    +      -       -      +
     73F  LEU*     3.7     6.5    -      -       -      +
     75F  TRP*     1.3    76.9    -      -       -      +
     77F  LEU*     1.3    64.7    +      -       +      +
     79F  PHE*     4.0     4.1    -      -       -      +
     80F  MET*     3.0    25.7    +      -       -      +
    224F  LEU*     5.9     0.6    -      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with LEU 77 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     73F  LEU*     2.9    17.1    +      -       +      +
     74F  ARG*     3.5     7.0    -      -       -      +
     76F  ILE*     1.3    78.0    -      -       +      +
     78F  THR*     1.3    57.5    +      -       -      +
     80F  MET*     3.7     4.8    -      -       +      +
     81F  LEU*     2.9    32.9    +      -       -      +
    178F  LEU*     4.3    19.2    -      -       +      +
    181F  MET*     3.5    53.2    -      -       +      +
    182F  LEU*     3.6    16.6    -      -       +      +
    185F  VAL*     3.7    18.6    -      -       +      -
----------------------------------------------------------
 Back to top of page

Residues in contact with THR 78 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     74F  ARG*     2.8    30.2    +      -       -      +
     75F  TRP*     3.1    15.4    +      -       +      -
     77F  LEU*     1.3    75.4    -      -       -      +
     79F  PHE*     1.3    62.7    +      -       +      +
     81F  LEU*     3.3    12.0    -      -       +      +
     82F  LEU*     2.9    25.4    +      -       +      +
    117F  ALA*     4.8    11.6    -      -       +      +
    120F  SER*     5.1     3.1    -      -       -      +
    121F  VAL*     3.5    32.8    -      -       +      -
    143F  TRP*     6.0     4.2    -      -       +      -
    182F  LEU*     4.7     7.6    -      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with PHE 79 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     75F  TRP*     2.9    67.0    +      +       +      +
     76F  ILE*     4.2     4.0    -      -       -      +
     78F  THR*     1.3    79.0    -      -       +      +
     80F  MET*     1.3    66.2    +      -       -      +
     82F  LEU*     3.1    25.2    +      -       +      +
     83F  PHE*     2.9    22.5    +      -       -      +
    121F  VAL*     6.2     1.6    -      -       +      -
    224F  LEU*     4.5    15.9    -      -       +      -
    225F  LEU*     3.8    34.5    -      -       +      -
    368F  LEU*     6.2     6.1    -      -       +      -
----------------------------------------------------------
 Back to top of page

Residues in contact with MET 80 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     76F  ILE      3.0    18.5    +      -       -      +
     77F  LEU*     3.7     6.3    -      -       +      +
     79F  PHE*     1.3    74.9    -      -       -      +
     81F  LEU*     1.3    63.7    +      -       -      +
     83F  PHE*     3.2     7.4    +      -       -      +
     84F  VAL*     3.0    30.6    +      -       +      +
    178F  LEU*     3.9    13.9    -      -       +      -
----------------------------------------------------------
 Back to top of page

Residues in contact with LEU 81 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     77F  LEU      2.9    18.3    +      -       -      +
     78F  THR*     3.3    11.4    -      -       +      +
     80F  MET*     1.3    74.8    -      -       -      +
     82F  LEU*     1.3    67.4    +      -       -      +
     84F  VAL*     3.2     2.0    -      -       -      +
     85F  LEU*     2.9    49.9    +      -       +      +
    113F  ALA*     5.1     1.6    -      -       +      +
    117F  ALA*     3.6    30.7    -      -       +      -
    143F  TRP*     4.0    17.9    -      -       +      -
    175F  LEU*     4.4     5.4    -      -       +      -
    178F  LEU*     3.5    19.2    -      -       +      +
    179F  TYR*     3.5    33.2    -      -       +      +
    182F  LEU*     6.0     2.5    -      -       +      -
----------------------------------------------------------
 Back to top of page

Residues in contact with LEU 82 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     78F  THR*     2.9    15.5    +      -       +      +
     79F  PHE*     3.3    29.6    -      -       +      +
     81F  LEU*     1.3    80.1    -      -       -      +
     83F  PHE*     1.3    64.0    +      -       -      +
     85F  LEU*     3.2     3.9    +      -       +      +
     86F  VAL*     3.0    23.4    +      -       +      +
    114F  PHE*     3.4    41.2    -      -       +      +
    117F  ALA*     5.7     5.4    -      -       +      -
    118F  VAL*     4.9    11.0    -      -       +      -
----------------------------------------------------------
 Back to top of page

Residues in contact with PHE 83 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     79F  PHE      2.9    12.8    +      -       -      +
     80F  MET*     3.6     9.9    -      -       -      +
     82F  LEU*     1.3    76.4    -      -       -      +
     84F  VAL*     1.3    75.1    +      -       +      +
     86F  VAL*     3.1     8.5    +      -       -      +
     87F  CYS*     3.0    44.1    +      -       -      -
    361F  LEU*     4.3    23.6    -      -       +      -
    364F  LEU*     5.3    17.0    -      -       +      -
    365F  ALA*     6.1     1.3    -      -       -      -
    368F  LEU*     4.7    21.5    -      -       +      -
----------------------------------------------------------
 Back to top of page

Residues in contact with VAL 84 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     80F  MET*     3.0    19.2    +      -       +      +
     81F  LEU*     3.2    21.1    -      -       -      +
     83F  PHE*     1.3    88.3    -      -       +      +
     85F  LEU*     1.3    60.1    +      -       +      +
     87F  CYS*     3.2    12.4    +      -       +      +
     88F  GLU*     2.9    27.4    +      -       -      +
    171F  LEU*     4.1     9.1    -      -       +      +
    174F  LEU*     3.6    28.9    -      -       +      -
    175F  LEU*     3.6    26.5    -      -       +      +
    178F  LEU*     4.0     2.0    -      -       +      -
----------------------------------------------------------
 Back to top of page

Residues in contact with LEU 85 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     81F  LEU*     2.9    42.3    +      -       +      +
     82F  LEU*     3.7     5.6    -      -       -      +
     84F  VAL*     1.3    76.6    -      -       +      +
     86F  VAL*     1.3    64.7    +      -       -      +
     88F  GLU*     3.1    24.1    +      -       -      +
     89F  ILE*     2.9    29.7    +      -       -      +
    110F  ALA*     3.8    16.4    -      -       +      +
    113F  ALA*     3.5    32.3    -      -       +      -
    114F  PHE*     4.5    13.7    -      -       +      +
    175F  LEU*     3.5    32.1    -      -       +      -
    179F  TYR*     4.8     1.6    -      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with VAL 86 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     82F  LEU*     3.0    13.7    +      -       +      +
     83F  PHE*     3.4    11.4    -      -       +      +
     85F  LEU*     1.3    76.3    -      -       -      +
     87F  CYS*     1.3    62.2    +      -       -      +
     89F  ILE*     3.2    12.9    +      -       -      +
     90F  ALA*     3.0    22.6    +      -       -      +
    114F  PHE*     5.5     7.7    -      -       +      -
    364F  LEU*     4.1    26.7    -      -       +      -
----------------------------------------------------------
 Back to top of page

Residues in contact with CYS 87 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     83F  PHE*     3.0    51.2    +      -       -      -
     84F  VAL*     3.3    12.8    -      -       -      +
     86F  VAL*     1.3    77.2    -      -       -      +
     88F  GLU*     1.3    56.3    +      -       -      +
     90F  ALA*     3.2     8.3    +      -       -      +
     91F  GLU*     2.9    27.9    +      -       -      +
    171F  LEU*     4.1    14.8    -      -       +      +
    361F  LEU*     5.4     5.8    -      -       -      -
----------------------------------------------------------
 Back to top of page

Residues in contact with GLU 88 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     84F  VAL      2.9    15.6    +      -       -      +
     85F  LEU*     3.1    24.4    +      -       -      +
     87F  CYS*     1.3    73.8    -      -       -      +
     89F  ILE*     1.3    61.3    +      -       -      +
     91F  GLU*     3.2     5.3    +      -       +      +
     92F  GLY*     2.9    26.0    +      -       -      -
    106F  LEU      4.9     9.1    -      -       -      +
    109F  PRO*     5.4     4.2    -      -       -      +
    110F  ALA*     3.8    21.4    +      -       +      +
    150F  LYS*     4.1    17.9    +      -       -      -
    153F  LYS*     5.6     3.8    +      -       -      -
    171F  LEU*     3.9    19.5    -      -       +      +
    175F  LEU*     4.5    15.3    -      -       +      +
----------------------------------------------------------
 Back to top of page

Residues in contact with ILE 89 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     85F  LEU      2.9    22.2    +      -       -      +
     86F  VAL*     3.6    11.4    -      -       -      +
     88F  GLU*     1.3    74.8    -      -       -      +
     90F  ALA*     1.3    64.1    +      -       -      +
     92F  GLY*     3.3     0.9    +      -       -      +
     93F  ILE*     3.0    43.8    +      -       +      +
    107F  TYR*     4.2    12.6    -      -       +      +
    110F  ALA*     3.5    35.4    -      -       +      +
    111F  GLY*     4.1    10.1    -      -       -      +
    114F  PHE*     4.2    18.8    -      -       +      -
----------------------------------------------------------
 Back to top of page

Residues in contact with ALA 90 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     86F  VAL      3.0    13.3    +      -       -      +
     87F  CYS*     3.3    12.6    -      -       -      +
     89F  ILE*     1.3    77.7    -      -       -      +
     91F  GLU*     1.3    63.2    +      -       -      +
     93F  ILE*     3.3     4.6    +      -       -      +
     94F  LEU*     2.9    30.3    +      -       +      +
    357F  VAL*     4.2    29.1    -      -       +      +
    360F  VAL*     6.2     1.8    -      -       +      -
----------------------------------------------------------
 Back to top of page

Residues in contact with GLU 91 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     87F  CYS      2.9    14.1    +      -       -      +
     88F  GLU*     3.6    11.7    -      -       +      +
     90F  ALA*     1.3    76.1    -      -       -      +
     92F  GLY*     1.3    58.0    +      -       -      +
     94F  LEU*     3.4    10.6    +      -       -      +
     95F  SER*     2.9    35.9    +      -       -      +
    167F  LEU*     6.3     2.7    -      -       +      -
    168F  ARG*     5.8     5.4    -      -       -      +
    171F  LEU*     5.2     6.7    -      -       +      -
----------------------------------------------------------
 Back to top of page

Residues in contact with GLY 92 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     88F  GLU      2.9    14.8    +      -       -      -
     89F  ILE      3.8     2.5    -      -       -      -
     91F  GLU*     1.3    75.9    -      -       -      +
     93F  ILE*     1.3    62.7    +      -       -      +
     95F  SER*     3.1     2.6    +      -       -      -
     96F  ASP*     3.0    24.9    +      -       -      +
    106F  LEU*     3.6    36.5    -      -       -      +
    107F  TYR*     4.3     4.3    -      -       -      -
    168F  ARG*     5.8     1.3    -      -       -      -
----------------------------------------------------------
 Back to top of page

Residues in contact with ILE 93 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     89F  ILE*     3.0    34.0    +      -       +      +
     90F  ALA*     4.0     4.5    -      -       -      +
     92F  GLY*     1.3    75.5    -      -       -      +
     94F  LEU*     1.3    65.7    +      -       +      +
     96F  ASP*     3.5    14.8    +      -       -      +
     97F  GLY*     3.8     4.2    +      -       -      -
    107F  TYR*     4.1    26.2    -      -       +      +
    357F  VAL*     5.7     6.7    -      -       +      -
----------------------------------------------------------
 Back to top of page

Residues in contact with LEU 94 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     90F  ALA*     2.9    29.9    +      -       +      +
     91F  GLU*     3.6     7.9    -      -       -      +
     93F  ILE*     1.3    78.7    -      -       +      +
     95F  SER*     1.3    58.3    +      -       -      +
     96F  ASP      3.0     0.2    -      -       -      -
     97F  GLY*     2.9    22.7    +      -       -      -
     98F  VAL      4.6     0.2    +      -       -      -
    353F  ALA      3.3    32.3    +      -       -      +
    354F  ASN*     3.8    19.1    -      -       +      -
    357F  VAL*     3.7    30.3    -      -       +      -
----------------------------------------------------------
 Back to top of page

Residues in contact with SER 95 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     91F  GLU*     2.9    22.8    +      -       -      +
     92F  GLY      3.7     0.2    -      -       -      -
     94F  LEU*     1.3    72.5    -      -       -      +
     96F  ASP*     1.3    60.0    +      -       -      +
     97F  GLY      3.3     0.6    +      -       -      -
     98F  VAL*     4.0    12.6    +      -       -      +
    103F  HIS*     4.5     4.9    +      -       -      -
    106F  LEU*     3.7    19.4    -      -       -      +
    165F  SER*     4.8     7.3    +      -       -      -
    168F  ARG*     4.0    18.8    +      -       -      -
----------------------------------------------------------
 Back to top of page

Residues in contact with ASP 96 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     92F  GLY      3.0    16.0    +      -       -      +
     93F  ILE*     3.8    10.1    -      -       -      +
     94F  LEU      3.0     1.0    +      -       -      -
     95F  SER*     1.3    74.0    -      -       -      +
     97F  GLY*     1.3    61.9    +      -       -      +
     98F  VAL      3.2     4.6    +      -       -      -
     99F  THR      3.7    15.5    +      -       -      +
    102F  HIS*     3.5    29.7    -      -       -      +
    103F  HIS*     2.7    48.6    +      -       -      +
    106F  LEU*     3.9     8.3    -      -       +      -
    107F  TYR*     5.1    10.9    -      -       +      -
----------------------------------------------------------
 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