Contacts of the helix formed by residues 293 - 317 (chain E) in PDB entry 2GPV


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 SER 293 (chain E).
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    292E  LEU*     1.3    77.2    -      -       -      +
    294E  LEU*     1.3    66.5    +      -       -      +
    295E  ALA*     4.2     3.1    -      -       -      -
    296E  ASP*     2.9    33.4    +      -       -      +
    297E  GLN*     3.1    10.4    +      -       -      +
    383E  GLU*     3.2    25.4    +      -       -      +
    384E  ASP*     5.5     3.0    -      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 294 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    256A  THR      5.2     2.7    -      -       -      +
    258A  PRO*     3.5    27.8    -      -       +      -
    451A  LEU*     4.3     7.2    -      -       +      -
    454A  LEU*     3.9    37.0    -      -       +      +
    455A  GLU*     4.1    31.0    -      -       +      +
    292E  LEU      3.8     1.6    +      -       -      -
    293E  SER*     1.3    72.2    -      -       -      +
    295E  ALA*     1.3    63.7    +      -       -      +
    297E  GLN*     3.1    18.0    +      -       -      +
    298E  MET*     3.0    29.2    +      -       -      +
----------------------------------------------------------
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Residues in contact with ALA 295 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    258A  PRO*     3.8    17.6    -      -       +      +
    259A  ASP      3.9    19.5    -      -       -      +
    293E  SER*     3.1     1.4    +      -       -      -
    294E  LEU*     1.3    77.3    -      -       -      +
    296E  ASP*     1.3    55.0    +      -       -      +
    298E  MET*     3.8     9.2    -      -       -      +
    299E  SER*     2.7    37.9    +      -       -      +
    381E  HIS      5.7     0.7    -      -       -      +
    383E  GLU*     3.8    34.3    -      -       +      +
----------------------------------------------------------
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Residues in contact with ASP 296 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    292E  LEU*     4.1    18.6    -      -       +      +
    293E  SER*     2.9    21.1    +      -       -      +
    295E  ALA*     1.3    79.5    -      -       -      +
    297E  GLN*     1.3    58.9    +      -       -      +
    299E  SER*     3.5     4.8    -      -       -      -
    300E  LEU*     3.1    34.9    +      -       -      +
    381E  HIS      4.4     1.0    -      -       -      +
    382E  ILE*     3.6    13.0    -      -       -      -
    383E  GLU*     2.7    31.4    +      -       -      +
    384E  ASP*     3.0    31.2    +      -       -      +
    388E  VAL*     3.7    10.7    -      -       +      +
----------------------------------------------------------
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Residues in contact with GLN 297 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    454A  LEU*     3.6    32.4    -      -       +      +
    284E  LYS*     5.1     1.9    -      -       -      +
    289E  PHE*     3.5    51.4    +      -       +      +
    290E  SER*     3.8    13.8    +      -       -      +
    292E  LEU*     2.9    28.2    +      -       +      +
    293E  SER      3.1    13.4    +      -       -      +
    294E  LEU*     3.6    18.7    -      -       -      +
    296E  ASP*     1.3    73.4    -      -       -      +
    298E  MET*     1.3    66.0    +      -       -      +
    300E  LEU*     3.5     0.7    +      -       -      +
    301E  LEU*     3.2    28.8    +      -       -      +
----------------------------------------------------------
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Residues in contact with MET 298 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    258A  PRO*     4.6    11.2    -      -       +      +
    260A  SER*     4.0    15.9    -      -       -      +
    447A  HIS*     3.1    39.0    -      -       +      +
    450A  PHE*     3.9    27.3    -      -       +      -
    451A  LEU*     3.9    34.3    -      -       -      +
    454A  LEU*     4.0    10.3    -      -       +      +
    294E  LEU*     3.0    18.9    +      -       +      +
    295E  ALA*     3.8    11.9    -      -       -      +
    297E  GLN*     1.3    73.0    -      -       -      +
    299E  SER*     1.3    57.1    +      -       -      +
    301E  LEU*     3.3     3.6    +      -       -      +
    302E  GLN*     2.7    44.0    +      -       +      +
----------------------------------------------------------
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Residues in contact with SER 299 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    295E  ALA*     2.7    22.5    +      -       -      +
    296E  ASP*     3.5     9.4    -      -       -      -
    297E  GLN      3.2     0.2    -      -       -      -
    298E  MET*     1.3    77.5    -      -       -      +
    300E  LEU*     1.3    58.5    +      -       -      +
    302E  GLN*     3.2    12.9    +      -       -      +
    303E  SER*     2.9    33.3    +      -       -      -
    379E  SER*     4.0    19.3    +      -       -      -
    381E  HIS*     3.4    20.9    +      -       -      +
    382E  ILE*     4.6     4.3    -      -       -      -
----------------------------------------------------------
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Residues in contact with LEU 300 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    289E  PHE*     4.0    19.3    -      -       +      -
    292E  LEU*     4.0    18.4    -      -       +      -
    296E  ASP      3.1    20.3    +      -       -      +
    297E  GLN      4.0     3.6    -      -       -      +
    298E  MET      3.3     0.2    -      -       -      -
    299E  SER*     1.3    76.9    -      -       -      +
    301E  LEU*     1.3    57.9    +      -       -      +
    303E  SER*     3.4     3.0    +      -       -      -
    304E  ALA*     2.9    31.2    +      -       -      +
    374E  LEU*     3.6    21.1    -      -       +      +
    375E  ALA*     4.6    10.1    -      -       -      +
    377E  SER*     3.2    21.4    +      -       -      +
    378E  ASP      5.4     1.6    -      -       -      +
    379E  SER*     5.1     1.1    -      -       -      -
    382E  ILE*     4.0    22.9    -      -       +      -
    388E  VAL*     4.2    22.4    -      -       +      -
    391E  LEU*     4.7     3.6    -      -       +      -
----------------------------------------------------------
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Residues in contact with LEU 301 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    450A  PHE*     4.3    16.2    -      -       +      -
    454A  LEU*     3.8    26.0    -      -       +      -
    279E  ILE*     4.7    18.4    -      -       +      -
    280E  ILE*     4.3    21.3    -      -       +      -
    283E  ALA*     4.1     9.4    -      -       +      -
    289E  PHE*     4.0    13.2    -      -       +      -
    297E  GLN      3.2    17.8    +      -       -      +
    298E  MET*     3.8     3.4    -      -       -      +
    300E  LEU*     1.3    74.0    -      -       -      +
    302E  GLN*     1.3    67.1    +      -       -      +
    303E  SER      3.0     1.6    -      -       -      -
    304E  ALA*     2.9     0.8    +      -       -      +
    305E  TRP*     2.9    32.3    +      -       +      +
    308E  ILE*     4.9     4.7    -      -       +      -
    374E  LEU*     3.7    27.8    -      -       +      -
----------------------------------------------------------
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Residues in contact with GLN 302 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    260A  SER*     5.9     1.8    -      -       -      -
    261A  ASP*     3.8    24.5    +      -       -      +
    262A  ILE*     4.4     2.4    -      -       -      +
    443A  LYS*     5.2    10.2    -      -       +      +
    446A  MET*     6.3     0.7    -      -       +      -
    447A  HIS*     3.7    29.4    +      -       -      +
    450A  PHE*     3.4    27.5    -      -       +      -
    298E  MET*     2.7    26.0    +      -       -      +
    299E  SER*     3.5    12.2    +      -       -      +
    301E  LEU*     1.3    71.7    -      -       -      +
    303E  SER*     1.3    58.5    +      -       -      +
    305E  TRP*     3.1    23.1    +      -       -      +
----------------------------------------------------------
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Residues in contact with SER 303 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    299E  SER      2.9    18.7    +      -       -      -
    300E  LEU      3.5     5.6    -      -       -      -
    301E  LEU      3.0     0.2    -      -       -      -
    302E  GLN*     1.3    79.0    -      -       -      +
    304E  ALA*     1.3    59.2    +      -       -      +
    305E  TRP*     3.6     1.1    +      -       -      -
    306E  MET*     5.1     1.4    +      -       -      +
    307E  GLU*     5.0     7.4    -      -       -      +
    377E  SER*     3.6    28.2    -      -       -      +
    378E  ASP      4.8     0.3    +      -       -      -
    379E  SER*     3.2    24.4    +      -       -      -
    425E  ARG*     6.1     0.2    -      -       -      -
    428E  SER*     5.4     1.7    +      -       -      -
----------------------------------------------------------
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Residues in contact with ALA 304 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    300E  LEU      2.9    21.1    +      -       -      +
    301E  LEU      2.9     0.4    +      -       -      -
    303E  SER*     1.3    73.8    -      -       -      +
    305E  TRP*     1.3    67.1    +      -       -      +
    306E  MET      3.2     2.5    -      -       -      -
    307E  GLU*     2.9    24.2    +      -       +      +
    308E  ILE*     3.1    16.4    +      -       +      +
    373E  ALA      3.7    21.1    -      -       -      +
    374E  LEU*     3.6    22.7    -      -       +      -
    377E  SER*     4.0     4.3    -      -       -      -
----------------------------------------------------------
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Residues in contact with TRP 305 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    443A  LYS*     6.3     0.8    -      -       -      +
    446A  MET*     3.4    36.1    -      -       +      +
    450A  PHE*     4.7    12.1    -      +       +      -
    276E  LEU*     3.8    26.6    -      -       +      +
    279E  ILE*     4.9     4.6    -      -       +      +
    301E  LEU*     2.9    17.5    +      -       +      +
    302E  GLN*     3.1    31.9    +      -       -      +
    303E  SER      3.6     1.5    -      -       -      -
    304E  ALA*     1.3    76.8    -      -       -      +
    306E  MET*     1.3    99.6    +      -       +      +
    308E  ILE*     3.4     9.0    +      -       -      +
    309E  LEU*     3.1    52.4    +      -       +      +
    432E  VAL*     4.7    10.2    -      -       +      +
    435E  PHE*     5.2     6.3    -      +       -      -
    436E  TYR*     4.1     9.4    +      -       -      -
    504E  OHT      3.9    26.7    -      +       -      -
----------------------------------------------------------
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Residues in contact with MET 306 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    303E  SER      5.1     0.6    +      -       -      +
    304E  ALA      3.2     1.0    -      -       -      -
    305E  TRP*     1.3   109.9    -      -       +      +
    307E  GLU*     1.3    58.4    +      -       -      +
    309E  LEU*     3.2     6.9    +      -       -      +
    310E  ILE*     2.9    45.4    +      -       +      +
    428E  SER*     3.0    32.1    +      -       -      +
    431E  ALA*     4.0    13.2    -      -       +      +
    432E  VAL*     3.4    37.5    -      -       +      +
    435E  PHE*     5.2     2.7    -      -       +      -
    504E  OHT      4.0    30.5    -      -       +      -
----------------------------------------------------------
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Residues in contact with GLU 307 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    303E  SER      5.0     5.0    -      -       -      +
    304E  ALA*     2.9    17.3    +      -       -      +
    306E  MET*     1.3    76.2    -      -       -      +
    308E  ILE*     1.3    56.7    +      -       -      +
    311E  LEU*     2.9    33.2    +      -       -      +
    373E  ALA*     4.0    27.1    -      -       +      +
    377E  SER*     5.6     1.5    -      -       -      -
    421E  LEU*     5.2     2.1    -      -       -      +
    424E  LEU*     3.7    26.6    -      -       +      +
    425E  ARG*     2.8    54.8    +      -       -      +
    428E  SER*     3.2    26.5    +      -       -      +
----------------------------------------------------------
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Residues in contact with ILE 308 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    279E  ILE*     3.6    38.3    -      -       +      +
    282E  TRP*     4.0    23.3    -      -       +      -
    301E  LEU*     4.9     2.0    -      -       +      -
    304E  ALA*     3.1    30.4    +      -       +      +
    305E  TRP*     3.8     9.0    -      -       -      +
    307E  GLU*     1.3    72.8    -      -       -      +
    309E  LEU*     1.3    63.6    +      -       -      +
    311E  LEU*     4.1     5.3    -      -       -      +
    312E  GLY*     3.2    17.0    +      -       -      -
    370E  LYS*     3.8    37.7    -      -       +      +
    373E  ALA*     4.9     4.3    -      -       +      -
    374E  LEU*     4.0    19.1    -      -       +      +
----------------------------------------------------------
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Residues in contact with LEU 309 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    272E  ALA*     4.0    10.8    -      -       +      +
    275E  GLU*     3.7    33.9    -      -       +      +
    276E  LEU*     4.1     8.5    -      -       +      -
    279E  ILE*     3.5    23.8    -      -       +      -
    305E  TRP*     3.1    47.9    +      -       +      +
    306E  MET*     3.2     9.8    +      -       -      +
    308E  ILE*     1.3    74.8    -      -       -      +
    310E  ILE*     1.3    64.7    +      -       -      +
    312E  GLY*     3.0    12.1    +      -       -      -
    313E  VAL      3.2     9.9    +      -       -      -
    316E  ARG*     4.7     0.2    +      -       -      -
    504E  OHT      3.6    43.3    +      -       +      +
----------------------------------------------------------
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Residues in contact with ILE 310 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    306E  MET*     2.9    30.9    +      -       +      +
    307E  GLU      4.1     1.6    -      -       -      +
    309E  LEU*     1.3    71.6    -      -       -      +
    311E  LEU*     1.3    60.9    +      -       -      +
    313E  VAL*     2.9    11.3    -      -       +      +
    314E  VAL*     2.8    39.6    +      -       +      +
    349E  ILE*     4.0    29.6    -      -       +      -
    352E  LEU*     4.1    13.9    -      -       +      -
    424E  LEU*     4.2     4.7    -      -       +      -
    427E  THR*     3.8    14.4    -      -       +      +
    428E  SER*     3.7    32.3    -      -       -      +
    431E  ALA*     4.0    10.1    -      -       +      -
    504E  OHT      4.5    10.3    -      -       +      -
----------------------------------------------------------
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Residues in contact with LEU 311 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    307E  GLU      2.9    19.3    +      -       -      +
    308E  ILE*     4.1     4.0    -      -       -      +
    310E  ILE*     1.3    76.5    -      -       -      +
    312E  GLY*     1.3    57.0    +      -       -      +
    314E  VAL*     3.3     8.9    +      -       +      +
    315E  TYR*     2.9    29.5    +      -       +      +
    352E  LEU*     6.1     0.2    -      -       +      -
    356E  TYR*     3.9    34.5    -      -       +      +
    361E  LEU*     5.5     2.7    -      -       +      -
    366E  PHE*     4.1    17.3    -      -       +      +
    369E  LEU*     4.2    10.5    -      -       +      +
    370E  LYS*     3.3    45.1    -      -       +      +
    373E  ALA*     5.1     2.0    -      -       +      -
    421E  LEU*     5.9     0.4    -      -       +      -
    424E  LEU*     4.1    25.2    -      -       +      +
----------------------------------------------------------
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Residues in contact with GLY 312 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    275E  GLU*     5.7     0.4    -      -       -      -
    308E  ILE      3.2     9.4    +      -       -      -
    309E  LEU      3.0     9.7    +      -       -      -
    311E  LEU*     1.3    77.7    -      -       -      +
    313E  VAL*     1.3    62.5    +      -       -      +
    315E  TYR*     3.2     4.3    +      -       -      +
    316E  ARG*     3.1    42.5    +      -       -      +
    366E  PHE*     4.2    15.3    -      -       -      -
    370E  LYS*     5.6     2.5    -      -       -      -
----------------------------------------------------------
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Residues in contact with VAL 313 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    309E  LEU      3.2     5.3    +      -       -      +
    310E  ILE*     2.9    34.8    -      -       +      +
    312E  GLY*     1.3    73.8    -      -       -      +
    314E  VAL*     1.3    57.6    +      -       -      +
    316E  ARG*     3.4    19.7    +      -       -      +
    317E  SER*     2.4    43.8    +      -       -      +
    324E  LEU*     4.1    12.3    -      -       +      -
    325E  VAL      3.6    18.6    -      -       -      +
    326E  TYR*     3.6    35.9    -      -       +      -
    349E  ILE*     4.2    13.7    -      -       +      -
    504E  OHT      4.2     3.1    -      -       +      +
----------------------------------------------------------
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Residues in contact with VAL 314 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    310E  ILE*     2.8    25.8    +      -       +      +
    311E  LEU*     3.4     9.2    -      -       +      +
    313E  VAL*     1.3    71.9    -      -       -      +
    315E  TYR*     1.3    63.5    +      -       -      +
    317E  SER*     3.2    15.2    +      -       -      -
    318E  LEU*     3.5    10.1    +      -       +      +
    349E  ILE*     3.8    20.2    -      -       +      +
    352E  LEU*     3.7    31.6    -      -       +      -
    353E  VAL*     3.9    24.6    -      -       +      +
    356E  TYR*     3.4    37.0    -      -       +      -
----------------------------------------------------------
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Residues in contact with TYR 315 (chain E). Click here for Legend to table.
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                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    311E  LEU*     2.9     8.5    +      -       +      +
    312E  GLY      3.7     2.7    -      -       -      +
    314E  VAL*     1.3    78.3    -      -       -      +
    316E  ARG*     1.3    71.2    +      -       +      +
    317E  SER      3.2     0.5    +      -       -      -
    318E  LEU*     3.3    47.4    +      -       +      +
    361E  LEU*     4.5    11.3    +      -       +      -
    363E  LYS*     3.4    50.8    +      -       -      +
    366E  PHE*     3.4    64.8    -      +       +      -
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Residues in contact with ARG 316 (chain E). Click here for Legend to table.
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                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    248E  LYS*     5.9     9.4    -      -       -      +
    275E  GLU*     3.8    17.5    +      -       -      -
    312E  GLY*     3.1    30.2    +      -       -      +
    313E  VAL*     3.4    15.5    -      -       -      +
    315E  TYR*     1.3    81.6    -      -       +      +
    317E  SER*     1.3    59.4    +      -       -      +
    318E  LEU      3.4     0.6    +      -       -      -
    319E  SER*     4.8     1.7    +      -       -      -
    320E  PHE*     3.7    10.6    -      -       -      -
    325E  VAL*     3.1    49.0    +      -       +      +
    326E  TYR      3.1    24.0    +      -       -      -
    327E  ALA*     4.9     3.8    -      -       -      +
    328E  ASP*     5.8     1.6    -      -       -      +
    504E  OHT      3.2    24.4    +      -       -      -
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Residues in contact with SER 317 (chain E). Click here for Legend to table.
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                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    313E  VAL*     2.4    27.9    +      -       -      +
    314E  VAL      3.4     7.2    -      -       -      -
    315E  TYR      3.1     0.6    -      -       -      -
    316E  ARG*     1.3    77.3    -      -       -      +
    318E  LEU*     1.3    61.6    +      -       -      +
    319E  SER      3.4     2.2    -      -       -      -
    320E  PHE*     3.1    24.8    +      -       -      +
    323E  GLU      3.6    16.9    -      -       -      +
    324E  LEU*     3.5     5.7    -      -       -      +
    325E  VAL*     3.1    27.1    +      -       -      -
    353E  VAL*     3.9    20.2    -      -       -      +
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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