Contacts of the helix formed by residues 227 - 251 (chain D) in PDB entry 4O9U


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 ASN 227 (chain D).
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     47C  VAL*     4.4     7.3    -      -       -      +
     48C  GLY*     5.0     4.2    -      -       -      -
     51C  VAL*     4.6     4.3    -      -       -      +
      8D  TYR*     4.2    12.7    +      -       -      -
     49D  TRP*     3.6    29.0    -      -       -      -
    222D  GLY*     2.7    11.0    +      -       -      +
    225D  VAL*     3.3    24.3    -      -       +      +
    226D  GLY*     1.3    75.7    -      -       -      +
    228D  PRO*     1.3    65.3    -      -       -      +
    229D  ALA*     3.5    17.6    +      -       -      +
    230D  LEU*     3.5    21.2    +      -       +      +
    231D  MET*     2.9    30.2    +      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with PRO 228 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     10A  TYR*     3.2    32.5    -      -       +      +
      1C  MET*     4.9     4.3    -      -       -      -
      3C  PHE*     3.6    20.6    -      -       +      -
      5D  GLN*     3.4    26.2    -      -       -      +
      8D  TYR*     4.3    13.0    -      -       +      -
     49D  TRP*     6.3     0.2    -      -       +      -
    226D  GLY      3.4     8.3    -      -       -      +
    227D  ASN*     1.3    88.4    -      -       -      +
    229D  ALA*     1.3    59.8    +      -       -      +
    231D  MET*     3.3    12.7    -      -       +      +
    232D  VAL*     2.9    37.0    +      -       +      +
----------------------------------------------------------
 Back to top of page

Residues in contact with ALA 229 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     10A  TYR*     4.0     5.1    +      -       -      -
     44C  VAL*     5.3     5.4    -      -       +      -
     47C  VAL*     5.9     1.1    -      -       +      -
      8D  TYR*     3.6    34.2    -      -       +      +
     11D  VAL*     4.3    16.2    -      -       +      -
     12D  ALA*     5.6     2.5    -      -       -      -
     15D  PHE*     5.2     2.9    -      -       +      -
     42D  ALA*     5.9     1.3    -      -       +      -
    227D  ASN*     3.4     6.9    -      -       -      +
    228D  PRO*     1.3    78.9    -      -       -      +
    230D  LEU*     1.3    63.5    +      -       +      +
    232D  VAL*     4.9     1.8    -      -       -      -
    233D  ALA*     2.8    37.0    +      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with LEU 230 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     44C  VAL*     3.4    31.9    -      -       +      +
     45C  VAL*     4.7     7.0    -      -       +      -
     47C  VAL*     4.6     4.5    -      -       +      -
     48C  GLY*     4.4    14.6    -      -       -      +
     99D  ILE*     4.1    25.8    -      -       +      -
    218D  VAL*     3.0    52.0    -      -       +      +
    219D  GLY*     3.3     3.6    -      -       -      -
    221D  GLU*     4.9     2.2    -      -       +      -
    222D  GLY*     3.7    17.5    -      -       -      +
    225D  VAL*     5.5     2.7    -      -       +      -
    227D  ASN*     3.5    22.3    +      -       +      +
    229D  ALA*     1.3    79.2    -      -       +      +
    231D  MET*     1.3    63.1    +      -       -      +
    233D  ALA*     5.0     1.1    -      -       -      -
    234D  GLY*     3.2    13.8    +      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with MET 231 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
      3C  PHE*     3.6    35.7    -      -       +      -
      8C  ALA*     3.8    17.7    -      -       +      -
     11C  ILE*     4.4    10.3    -      -       +      -
    219D  GLY*     4.0     6.4    -      -       -      -
    222D  GLY      3.4    21.5    -      -       -      +
    223D  PHE*     3.4    42.7    -      -       +      +
    226D  GLY*     4.5     4.0    -      -       -      -
    227D  ASN      2.9    28.0    +      -       -      +
    228D  PRO*     3.3    17.0    -      -       +      +
    230D  LEU*     1.3    80.5    -      -       -      +
    232D  VAL*     1.3    62.4    +      -       +      +
    235D  THR*     3.0    26.2    +      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with VAL 232 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     10A  TYR*     3.5    24.7    -      -       +      -
     14A  LEU*     4.3    10.1    -      -       +      -
     11C  ILE*     3.6    25.8    -      -       +      -
     15C  THR*     3.4    21.6    +      -       -      +
     12D  ALA*     3.9    23.8    -      -       +      -
     16D  ILE*     4.3     6.3    -      -       +      -
    228D  PRO*     2.9    23.7    +      -       +      +
    229D  ALA      4.3     1.1    -      -       -      +
    231D  MET*     1.3    72.5    -      -       +      +
    233D  ALA*     1.3    55.4    +      -       -      +
    235D  THR*     3.3     9.7    -      -       -      +
    236D  LEU*     2.8    36.7    +      -       +      +
----------------------------------------------------------
 Back to top of page

Residues in contact with ALA 233 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     41C  ILE*     4.7     8.7    -      -       +      -
     42C  HIS*     6.0     0.7    -      -       -      -
     44C  VAL*     4.2    15.5    -      -       +      -
     15D  PHE*     3.8    31.2    -      -       +      -
    218D  VAL*     5.2     0.2    -      -       -      -
    229D  ALA      2.8    22.4    +      -       -      +
    232D  VAL*     1.3    73.9    -      -       -      +
    234D  GLY*     1.3    54.3    +      -       -      +
    236D  LEU*     3.3     9.6    -      -       -      -
    237D  VAL*     2.6    41.5    +      -       +      +
----------------------------------------------------------
 Back to top of page

Residues in contact with GLY 234 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     42C  HIS*     5.9     0.7    -      -       -      -
    215D  GLY*     3.0    28.4    -      -       -      +
    218D  VAL*     3.8    11.5    -      -       -      +
    219D  GLY*     3.6     5.2    -      -       -      -
    230D  LEU      3.2    21.9    +      -       -      -
    233D  ALA*     1.3    77.5    -      -       -      +
    235D  THR*     1.3    49.5    +      -       -      +
    237D  VAL*     3.1     2.1    +      -       -      -
    238D  GLY      2.8    31.2    +      -       -      -
----------------------------------------------------------
 Back to top of page

Residues in contact with THR 235 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     12C  PHE*     3.9    41.3    +      -       +      +
     15C  THR*     3.4    22.0    -      -       +      -
     16C  ALA*     4.2    12.1    -      -       -      +
    215D  GLY      4.8     0.7    -      -       -      -
    216D  MET*     5.8     2.0    -      -       -      +
    219D  GLY*     4.0     7.3    -      -       -      -
    223D  PHE*     5.0     0.9    -      -       +      -
    231D  MET      3.0    22.4    +      -       -      +
    232D  VAL      3.3     7.9    -      -       -      +
    234D  GLY*     1.3    71.3    -      -       -      +
    236D  LEU*     1.3    60.7    +      -       -      +
    237D  VAL      3.2     0.4    -      -       -      -
    238D  GLY*     4.0     2.9    -      -       -      +
    239D  ALA*     3.5    25.8    +      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with LEU 236 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     15C  THR*     3.2    29.2    -      -       -      +
     18C  LEU*     5.0     0.4    -      -       +      -
     19C  GLY*     3.8    20.7    -      -       -      +
     22C  LEU*     4.9     1.1    -      -       +      -
     41C  ILE*     5.1     3.1    -      -       +      -
     15D  PHE*     4.2    20.0    -      -       +      +
     16D  ILE*     3.8    28.5    -      -       +      -
     19D  LEU*     3.7    27.6    -      -       +      +
    232D  VAL*     2.8    21.2    +      -       +      +
    233D  ALA*     3.0    11.4    +      -       -      +
    235D  THR*     1.3    77.3    -      -       -      +
    237D  VAL*     1.3    63.4    +      -       +      +
    239D  ALA*     5.4     0.8    -      -       -      +
    240D  ALA*     3.6    17.3    +      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with VAL 237 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     38C  SER*     3.8    16.7    -      -       -      +
     41C  ILE*     3.7    37.0    -      -       +      -
     42C  HIS*     3.6    39.5    -      -       +      +
    211D  ASN*     4.2     8.5    -      -       -      +
    212D  ALA*     4.8     0.2    -      -       -      -
    215D  GLY*     4.0     9.2    -      -       -      -
    233D  ALA      2.6    21.5    +      -       -      +
    234D  GLY      3.6     3.1    -      -       -      +
    236D  LEU*     1.3    78.3    -      -       +      +
    238D  GLY*     1.3    60.6    +      -       -      +
    239D  ALA      3.4     0.4    -      -       -      -
    240D  ALA*     3.3     5.5    +      -       -      +
    241D  GLY*     2.8    27.5    +      -       -      -
----------------------------------------------------------
 Back to top of page

Residues in contact with GLY 238 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    212D  ALA*     3.3    28.6    -      -       -      +
    215D  GLY*     3.7     5.4    -      -       -      -
    216D  MET*     4.1     7.0    -      -       -      -
    234D  GLY      2.8    19.2    +      -       -      -
    235D  THR*     4.5     2.0    -      -       -      -
    237D  VAL*     1.3    73.7    -      -       -      +
    239D  ALA*     1.3    49.5    +      -       -      +
    241D  GLY      3.1     2.1    +      -       -      -
    242D  THR*     2.7    40.1    +      -       -      -
----------------------------------------------------------
 Back to top of page

Residues in contact with ALA 239 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     16C  ALA*     4.4    24.2    -      -       +      +
     19C  GLY*     6.1     0.9    -      -       -      -
     20C  TYR*     5.4    11.5    -      -       +      +
    235D  THR*     3.5    22.2    +      -       -      +
    236D  LEU      5.4     0.2    -      -       -      +
    238D  GLY*     1.3    74.6    -      -       -      +
    240D  ALA*     1.3    61.5    +      -       -      +
    242D  THR*     3.3     9.9    -      -       -      -
    243D  LEU*     3.1    24.9    +      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with ALA 240 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     19C  GLY*     5.3     5.3    -      -       -      +
     20C  TYR*     5.5     1.7    -      -       -      +
     23C  ILE*     4.1    30.1    -      -       +      +
     38C  SER*     5.5     7.2    -      -       -      -
     19D  LEU*     4.6    10.8    -      -       +      -
    236D  LEU      3.6    16.8    +      -       -      +
    237D  VAL*     3.3    10.4    +      -       -      +
    238D  GLY      3.2     0.2    -      -       -      -
    239D  ALA*     1.3    78.3    -      -       -      +
    241D  GLY*     1.3    56.4    +      -       -      +
    243D  LEU*     3.7     3.6    +      -       -      +
    244D  LEU*     2.9    32.0    +      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with GLY 241 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     38C  SER*     5.8     1.2    -      -       -      -
    208D  SER*     3.1     7.0    +      -       -      -
    211D  ASN*     4.6     6.3    -      -       -      -
    212D  ALA*     3.5    16.8    -      -       -      -
    237D  VAL      2.8    14.5    +      -       -      -
    238D  GLY      3.4     3.8    -      -       -      -
    240D  ALA*     1.3    74.1    -      -       -      +
    242D  THR*     1.3    54.9    +      -       -      +
    244D  LEU*     3.7    12.3    -      -       -      -
    245D  THR*     2.5    39.0    +      -       -      -
----------------------------------------------------------
 Back to top of page

Residues in contact with THR 242 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    212D  ALA*     3.5    10.6    -      -       -      +
    216D  MET*     4.7    15.1    -      -       +      +
    238D  GLY      2.7    27.5    +      -       -      -
    239D  ALA*     3.3    13.6    -      -       -      -
    240D  ALA      3.2     0.2    -      -       -      -
    241D  GLY*     1.3    69.9    -      -       -      +
    243D  LEU*     1.3    66.9    +      -       -      +
    245D  THR*     3.2    14.3    +      -       -      -
    246D  VAL*     3.3    23.5    +      -       +      +
----------------------------------------------------------
 Back to top of page

Residues in contact with LEU 243 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     20C  TYR*     3.7    61.0    -      -       +      +
     23C  ILE*     5.0    11.4    -      -       +      +
     24C  THR*     4.5     9.9    -      -       +      +
    239D  ALA      3.1    12.1    +      -       -      +
    240D  ALA*     4.1     4.0    -      -       -      +
    242D  THR*     1.3    79.4    -      -       -      +
    244D  LEU*     1.3    53.0    +      -       -      +
    246D  VAL*     3.2     8.9    +      -       +      +
    247D  LEU*     2.8    60.0    +      -       +      +
----------------------------------------------------------
 Back to top of page

Residues in contact with LEU 244 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     23C  ILE*     4.7    11.4    -      -       +      +
     26C  VAL*     6.0     0.4    -      -       +      -
     31C  HIS*     4.9    21.8    -      -       +      +
     34C  LEU*     4.0    25.4    -      -       +      -
     35C  MET*     4.4    29.8    -      -       +      -
     38C  SER*     4.6     4.5    -      -       -      +
    208D  SER*     3.7    15.5    -      -       -      +
    211D  ASN*     4.5     7.0    -      -       -      +
    240D  ALA*     2.9    20.3    +      -       +      +
    241D  GLY*     3.4    13.7    -      -       -      +
    242D  THR      3.1     0.2    -      -       -      -
    243D  LEU*     1.3    77.2    -      -       -      +
    245D  THR*     1.3    57.3    +      -       -      +
    247D  LEU*     3.6     7.4    +      -       +      +
    248D  MET*     3.0    41.2    +      -       +      +
----------------------------------------------------------
 Back to top of page

Residues in contact with THR 245 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    205D  VAL*     3.3    36.5    -      -       +      +
    208D  SER*     2.8    25.4    +      -       -      -
    209D  PHE*     3.3    23.2    +      -       +      +
    212D  ALA*     4.5     0.9    -      -       -      +
    241D  GLY      2.5    25.3    +      -       -      -
    242D  THR*     3.2     7.3    +      -       -      -
    244D  LEU*     1.3    72.2    -      -       -      +
    246D  VAL*     1.3    59.2    +      -       -      +
    248D  MET*     3.4     4.2    -      -       -      +
    249D  ALA*     2.8    30.4    +      -       -      +
    256D  VAL*     5.0     7.6    -      -       +      -
----------------------------------------------------------
 Back to top of page

Residues in contact with VAL 246 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    242D  THR*     3.4    20.9    -      -       +      +
    243D  LEU*     3.2    10.9    +      -       +      +
    245D  THR*     1.3    74.4    -      -       -      +
    247D  LEU*     1.3    58.4    +      -       -      +
    249D  ALA*     2.9     6.5    +      -       -      -
    250D  ARG*     2.8    68.0    +      -       -      +
    256D  VAL*     4.3    22.4    -      -       +      -
----------------------------------------------------------
 Back to top of page

Residues in contact with LEU 247 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     23C  ILE*     4.8     8.3    -      -       +      +
     24C  THR*     5.1     6.7    -      -       -      +
     26C  VAL*     4.4    21.8    -      -       +      -
     31C  HIS*     4.9    18.1    -      -       +      +
    243D  LEU*     2.8    41.9    +      -       +      +
    244D  LEU*     4.1     7.6    -      -       +      +
    246D  VAL*     1.3    72.6    -      -       -      +
    248D  MET*     1.3    57.6    +      -       -      +
    249D  ALA      3.3     0.2    -      -       -      -
    250D  ARG*     4.8     3.1    -      -       +      +
    251D  ALA*     3.1    29.2    +      -       +      +
----------------------------------------------------------
 Back to top of page

Residues in contact with MET 248 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     31C  HIS*     4.1    35.9    -      -       +      +
     35C  MET*     4.5     8.5    -      -       +      -
    204D  PRO*     3.8    21.8    -      -       +      +
    205D  VAL*     3.3    16.1    -      -       +      +
    208D  SER*     4.7    11.4    -      -       -      -
    244D  LEU*     3.0    26.6    +      -       +      +
    245D  THR*     3.4     4.5    -      -       -      +
    247D  LEU*     1.3    73.7    -      -       -      +
    249D  ALA*     1.3    58.5    +      -       -      +
    251D  ALA*     4.2     9.2    -      -       +      -
    252D  MET*     3.4    16.9    -      -       +      +
    332D  PRO*     5.6     5.8    -      -       +      +
    338D  PRO*     3.0    45.5    -      -       +      -
----------------------------------------------------------
 Back to top of page

Residues in contact with ALA 249 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    205D  VAL*     3.7    22.2    -      -       +      -
    245D  THR      2.8    18.3    +      -       -      +
    246D  VAL*     2.9     8.5    +      -       -      +
    248D  MET*     1.3    78.5    -      -       -      +
    250D  ARG*     1.3    55.2    +      -       +      +
    251D  ALA      3.3     0.2    -      -       -      -
    252D  MET*     3.0    20.0    -      -       -      +
    254D  ARG*     2.6    24.2    -      -       -      +
    255D  SER      4.2    16.2    -      -       -      +
    256D  VAL*     4.2    13.5    -      -       +      -
----------------------------------------------------------
 Back to top of page

Residues in contact with ARG 250 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    246D  VAL*     2.8    43.2    +      -       -      +
    247D  LEU*     4.8     2.4    -      -       -      +
    249D  ALA*     1.3    70.8    -      -       +      +
    251D  ALA*     1.3    60.1    +      -       -      +
    252D  MET      3.0    11.2    -      -       -      +
    254D  ARG      3.6    11.4    -      -       -      +
    255D  SER*     4.9     9.4    -      -       -      +
    256D  VAL*     5.4     4.5    -      -       -      -
    393D  GLY      4.8     1.7    -      -       -      +
    395D  PRO*     3.7    11.3    -      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with ALA 251 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     31C  HIS*     5.6     4.5    -      -       +      -
    247D  LEU*     3.1    24.9    +      -       +      +
    248D  MET*     4.2    10.1    -      -       +      -
    250D  ARG*     1.3    74.7    -      -       -      +
    252D  MET*     1.3    61.2    +      -       -      +
    331D  HIS*     4.6     3.1    -      -       -      -
    332D  PRO*     4.0    27.9    -      -       +      +
    333D  VAL*     3.3    13.7    -      -       +      +
    395D  PRO*     3.3    21.7    -      -       -      +
----------------------------------------------------------
 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