Contacts of the helix formed by residues 766 - 793 (chain D) in PDB entry 5UHE


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 766 (chain D).
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    760D  PHE*     3.8     0.4    -      -       -      -
    764D  ALA      4.1     1.4    +      -       -      -
    765D  LEU*     1.3    76.1    -      -       -      +
    767D  HIS*     1.3    75.5    +      -       -      +
    768D  ASP*     3.3    26.1    +      -       -      +
    769D  GLU*     3.2    35.1    +      -       +      +
    770D  ARG*     3.0    27.0    +      -       -      +
----------------------------------------------------------
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Residues in contact with HIS 767 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    760D  PHE*     3.6    29.1    -      +       +      -
    766D  ASN*     1.3    83.4    +      -       -      +
    768D  ASP*     1.3    59.8    +      -       -      +
    769D  GLU      3.6     0.2    +      -       -      -
    770D  ARG*     3.7    28.0    +      -       -      +
    771D  ASN*     3.5    31.3    +      -       -      +
----------------------------------------------------------
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Residues in contact with ASP 768 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    766D  ASN*     3.3    18.7    -      -       -      +
    767D  HIS*     1.3    79.1    -      -       -      +
    769D  GLU*     1.3    63.0    +      -       -      +
    771D  ASN*     4.2     2.6    +      -       -      +
    772D  GLU*     3.3    35.4    +      -       -      +
    830D  GLU*     5.4     3.6    -      -       -      +
----------------------------------------------------------
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Residues in contact with GLU 769 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    764D  ALA      4.9     1.7    -      -       -      +
    765D  LEU*     4.2    13.9    -      -       +      +
    766D  ASN*     3.2    42.1    +      -       +      +
    767D  HIS      3.3     0.6    -      -       -      -
    768D  ASP*     1.3    80.5    -      -       -      +
    770D  ARG*     1.3    58.1    +      -       -      +
    772D  GLU*     3.3    10.4    +      -       -      +
    773D  ALA*     2.9    32.7    +      -       -      +
----------------------------------------------------------
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Residues in contact with ARG 770 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    756D  VAL*     4.4    11.8    -      -       +      +
    757D  GLU*     2.8    41.1    +      -       -      +
    760D  PHE*     3.4    48.0    -      -       +      +
    765D  LEU*     4.9     6.9    -      -       +      +
    766D  ASN      3.0    16.1    +      -       -      +
    767D  HIS*     3.7    20.8    -      -       -      +
    769D  GLU*     1.3    76.4    -      -       -      +
    771D  ASN*     1.3    81.2    +      -       -      +
    773D  ALA*     3.3     5.5    +      -       -      +
    774D  LEU*     2.9    42.5    +      -       +      +
    833D  PRO*     5.5     5.3    -      -       -      +
----------------------------------------------------------
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Residues in contact with ASN 771 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    767D  HIS*     3.5    26.8    +      -       -      +
    768D  ASP*     4.6     3.1    -      -       -      +
    769D  GLU      3.4     0.2    -      -       -      -
    770D  ARG*     1.3   103.1    +      -       -      +
    772D  GLU*     1.3    55.5    +      -       -      +
    774D  LEU*     3.6     7.2    -      -       -      +
    775D  VAL*     2.7    44.0    +      -       +      +
    830D  GLU*     4.9    18.5    +      -       -      +
    831D  PHE      6.0     0.7    -      -       -      +
    833D  PRO*     4.2    27.3    -      -       +      +
----------------------------------------------------------
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Residues in contact with GLU 772 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    768D  ASP*     3.3    31.8    +      -       -      +
    769D  GLU*     3.3    11.3    +      -       -      +
    771D  ASN*     1.3    78.8    -      -       -      +
    773D  ALA*     1.3    57.0    +      -       -      +
    775D  VAL*     4.0     7.1    -      -       -      +
    776D  GLU*     3.1    33.3    +      -       +      +
    830D  GLU*     5.7     2.8    +      -       -      +
----------------------------------------------------------
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Residues in contact with ALA 773 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    756D  VAL*     4.7    14.8    -      -       +      -
    765D  LEU*     6.1     1.8    -      -       +      -
    769D  GLU      2.9    17.3    +      -       -      +
    770D  ARG*     3.7     3.8    -      -       -      +
    772D  GLU*     1.3    75.9    -      -       -      +
    774D  LEU*     1.3    59.7    +      -       -      +
    775D  VAL      3.2     1.6    -      -       -      -
    776D  GLU*     3.0     9.6    +      -       -      +
    777D  ILE*     2.9    35.3    +      -       +      +
----------------------------------------------------------
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Residues in contact with LEU 774 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    753D  ALA*     4.0    22.9    -      -       +      +
    756D  VAL*     4.2    13.7    -      -       +      -
    757D  GLU*     3.6    24.2    -      -       +      +
    770D  ARG*     2.9    41.6    +      -       +      +
    771D  ASN*     3.1     6.3    +      -       -      +
    773D  ALA*     1.3    76.3    -      -       -      +
    775D  VAL*     1.3    62.8    +      -       -      +
    777D  ILE*     3.4    21.6    +      -       +      +
    778D  TRP*     3.1    37.8    +      -       -      +
    833D  PRO*     4.2    26.9    -      -       +      +
----------------------------------------------------------
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Residues in contact with VAL 775 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    771D  ASN*     2.7    28.8    +      -       +      +
    772D  GLU*     4.0     8.7    -      -       -      +
    774D  LEU*     1.3    74.1    -      -       -      +
    776D  GLU*     1.3    66.1    +      -       -      +
    778D  TRP*     4.0     1.5    -      -       -      -
    779D  LYS*     3.0    56.6    +      -       +      +
    823D  LEU*     4.1    14.1    -      -       +      +
    830D  GLU*     5.6     5.4    -      -       +      +
    831D  PHE*     4.0    35.9    -      -       +      +
    832D  ILE      5.1     3.1    -      -       -      +
    833D  PRO*     5.2     5.2    -      -       +      -
----------------------------------------------------------
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Residues in contact with GLU 776 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    772D  GLU*     3.1    24.1    -      -       +      +
    773D  ALA*     3.0    11.1    +      -       -      +
    775D  VAL*     1.3    88.6    -      -       -      +
    777D  ILE*     1.3    64.9    +      -       -      +
    779D  LYS*     3.9    18.0    +      -       -      +
    780D  GLU*     3.2    25.7    +      -       -      +
----------------------------------------------------------
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Residues in contact with ILE 777 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    749D  TYR*     3.4    47.2    -      -       +      +
    752D  ARG*     3.7    34.8    -      -       +      +
    753D  ALA*     3.9     4.7    -      -       +      -
    756D  VAL*     3.6    31.0    -      -       +      -
    773D  ALA*     2.9    19.4    +      -       +      +
    774D  LEU*     3.7    26.7    -      -       +      +
    775D  VAL      3.3     0.2    -      -       -      -
    776D  GLU*     1.3    79.0    -      -       +      +
    778D  TRP*     1.3    61.0    +      -       +      +
    780D  GLU*     3.6     5.8    +      -       -      +
    781D  ALA      3.2    18.7    +      -       -      -
----------------------------------------------------------
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Residues in contact with TRP 778 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    746D  LEU*     4.4    20.9    -      -       +      -
    749D  TYR*     3.8    36.8    -      -       +      -
    750D  GLU*     3.3    29.4    -      -       +      -
    753D  ALA*     4.0    18.1    -      -       +      +
    774D  LEU*     3.1    31.2    +      -       -      +
    775D  VAL*     4.3     0.7    -      -       -      +
    777D  ILE*     1.3    77.4    -      -       +      +
    779D  LYS*     1.3    65.3    +      -       -      +
    781D  ALA*     3.2    14.1    -      -       +      +
    782D  THR*     3.1    28.6    +      -       +      +
    820D  MET*     5.5     1.6    -      -       +      -
    823D  LEU*     4.1    20.6    -      -       +      -
    833D  PRO      3.1    26.1    +      -       -      -
    835D  PRO*     3.4    32.8    -      -       +      +
    837D  LYS*     4.0     9.2    -      -       -      -
----------------------------------------------------------
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Residues in contact with LYS 779 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    775D  VAL*     3.0    40.6    +      -       +      +
    776D  GLU*     3.9    20.0    +      -       -      +
    778D  TRP*     1.3    76.7    -      -       -      +
    780D  GLU*     1.3    61.0    +      -       -      +
    782D  THR*     2.6    24.9    +      -       -      -
    783D  ASP*     3.4    11.9    +      -       -      +
    823D  LEU*     3.7    19.9    -      -       +      +
    831D  PHE*     5.7    10.8    -      -       +      -
----------------------------------------------------------
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Residues in contact with GLU 780 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    748D  HIS*     5.9     0.2    +      -       -      -
    749D  TYR*     3.6    24.7    +      -       +      +
    752D  ARG*     3.4    23.9    +      -       -      -
    776D  GLU      3.2    16.9    +      -       -      +
    777D  ILE*     3.7     4.9    -      -       -      +
    779D  LYS*     1.3    79.0    -      -       -      +
    781D  ALA*     1.3    62.9    +      -       -      +
    783D  ASP*     3.5     9.4    +      -       +      +
    784D  GLU*     3.4    19.6    +      -       -      +
----------------------------------------------------------
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Residues in contact with ALA 781 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    745D  ILE*     4.6     2.0    -      -       +      +
    746D  LEU*     5.0     8.1    -      -       +      -
    749D  TYR*     3.7    32.1    -      -       +      -
    777D  ILE      3.2    14.2    +      -       -      +
    778D  TRP*     3.2    27.8    -      -       +      +
    779D  LYS      3.1     0.2    -      -       -      -
    780D  GLU*     1.3    78.2    -      -       -      +
    782D  THR*     1.3    62.6    +      -       +      +
    784D  GLU*     3.3     6.2    +      -       -      +
    785D  VAL*     3.2    26.0    +      -       -      +
    820D  MET*     4.7     1.6    -      -       -      -
----------------------------------------------------------
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Residues in contact with THR 782 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    778D  TRP*     3.1    13.8    +      -       +      +
    779D  LYS*     2.6    25.2    +      -       -      -
    781D  ALA*     1.3    72.4    -      -       -      +
    783D  ASP*     1.3    67.3    +      -       -      +
    785D  VAL*     3.3     2.9    +      -       -      +
    786D  GLY      3.2    16.3    +      -       -      -
    815D  ARG*     3.5    28.1    -      -       -      +
    820D  MET*     3.5    31.0    -      -       +      -
    822D  GLY*     3.6    25.4    -      -       -      -
    823D  LEU*     4.7     3.1    -      -       +      +
    835D  PRO*     6.2     0.4    -      -       +      -
----------------------------------------------------------
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Residues in contact with ASP 783 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    779D  LYS      3.4    11.4    +      -       -      +
    780D  GLU*     3.7    12.5    -      -       -      +
    781D  ALA      3.3     0.4    -      -       -      -
    782D  THR*     1.3    82.2    +      -       -      +
    784D  GLU*     1.3    58.2    +      -       -      +
    786D  GLY*     3.0    16.2    +      -       -      -
    787D  GLN*     3.1    24.5    +      -       -      +
    815D  ARG*     5.5     1.1    -      -       -      +
----------------------------------------------------------
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Residues in contact with GLU 784 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    745D  ILE*     3.9    33.3    -      -       +      +
    748D  HIS*     5.1     3.7    -      -       -      -
    749D  TYR*     2.2    36.0    +      -       -      +
    780D  GLU      3.4     6.8    +      -       -      +
    781D  ALA      3.3     9.5    +      -       -      +
    783D  ASP*     1.3    76.7    -      -       -      +
    785D  VAL*     1.3    64.1    +      -       -      +
    787D  GLN*     3.6    11.4    +      -       +      +
    788D  ALA*     3.3    20.4    +      -       -      +
----------------------------------------------------------
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Residues in contact with VAL 785 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    739D  PRO*     4.2    11.8    -      -       +      +
    742D  LYS*     4.9     9.6    -      -       +      +
    745D  ILE*     4.7    16.4    -      -       +      -
    746D  LEU*     4.9     9.4    -      -       +      -
    781D  ALA      3.2    16.3    +      -       -      +
    782D  THR      3.6     6.5    -      -       -      +
    783D  ASP      3.2     0.4    -      -       -      -
    784D  GLU*     1.3    77.1    -      -       -      +
    786D  GLY*     1.3    61.9    +      -       -      +
    788D  ALA*     3.2    18.7    -      -       -      +
    789D  LEU*     3.4    10.4    +      -       -      +
    815D  ARG*     5.1     2.5    -      -       +      -
    819D  GLY*     3.7    35.9    -      -       -      +
    820D  MET*     3.6    24.5    -      -       +      +
----------------------------------------------------------
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Residues in contact with GLY 786 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    782D  THR      3.2     8.6    +      -       -      -
    783D  ASP*     3.0     8.2    +      -       -      -
    785D  VAL*     1.3    76.2    -      -       -      +
    787D  GLN*     1.3    65.5    +      -       -      +
    789D  LEU*     3.0    15.2    +      -       -      +
    790D  ARG*     3.2    11.8    +      -       -      +
    811D  PHE*     3.6    24.2    -      -       -      -
    815D  ARG*     4.4    13.4    -      -       -      +
----------------------------------------------------------
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Residues in contact with GLN 787 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    783D  ASP*     3.1    21.1    +      -       -      +
    784D  GLU*     3.9    13.9    -      -       +      +
    786D  GLY*     1.3    74.0    -      -       -      +
    788D  ALA*     1.3    64.2    +      -       -      +
    789D  LEU      3.2     0.9    +      -       -      -
    790D  ARG*     3.4    19.3    +      -       -      +
    791D  GLU*     3.4    23.2    +      -       -      +
----------------------------------------------------------
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Residues in contact with ALA 788 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    739D  PRO*     4.0    15.9    -      -       +      -
    740D  PRO*     4.4     1.0    -      -       -      +
    741D  ARG*     3.2    28.9    +      -       -      +
    745D  ILE*     4.5     8.5    -      -       +      -
    784D  GLU      3.3    12.4    +      -       -      +
    785D  VAL*     3.2    16.8    -      -       -      +
    786D  GLY      3.1     0.4    -      -       -      -
    787D  GLN*     1.3    79.9    -      -       -      +
    789D  LEU*     1.3    57.1    +      -       -      +
    791D  GLU*     3.9     6.5    -      -       -      +
    792D  HIS*     3.0    28.2    +      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 789 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    737D  LEU      3.8    12.1    -      -       -      +
    738D  VAL      4.8     0.4    -      -       -      -
    739D  PRO*     3.6    28.3    -      -       +      -
    785D  VAL      3.4    10.3    +      -       -      +
    786D  GLY      3.0     9.2    +      -       -      +
    788D  ALA*     1.3    79.3    -      -       -      +
    790D  ARG*     1.3    58.3    +      -       -      +
    792D  HIS*     2.9     5.4    +      -       -      +
    793D  TYR*     2.5    68.1    +      -       +      +
    811D  PHE*     3.7    14.1    -      -       +      -
    814D  THR*     3.8    13.2    -      -       +      +
    815D  ARG*     4.1    11.7    -      -       +      -
    818D  ALA*     3.8    20.2    -      -       +      -
    819D  GLY*     3.9     9.6    -      -       -      +
----------------------------------------------------------
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Residues in contact with ARG 790 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    786D  GLY      3.2     5.8    +      -       -      +
    787D  GLN*     3.4    16.6    +      -       -      +
    789D  LEU*     1.3    78.7    -      -       -      +
    791D  GLU*     1.3    57.9    +      -       -      +
    793D  TYR*     3.0    24.6    -      -       -      +
    795D  ASP*     5.3     2.1    -      -       -      +
    800D  ILE*     5.5     4.8    -      -       +      +
    803D  VAL*     5.1     0.8    -      -       -      +
    804D  ASP*     3.4    30.5    +      -       -      -
    811D  PHE*     3.4    58.8    -      -       +      +
----------------------------------------------------------
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Residues in contact with GLU 791 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    741D  ARG*     2.8    31.2    +      -       -      +
    787D  GLN*     3.4    19.5    +      -       -      +
    788D  ALA*     3.9     6.0    -      -       -      +
    790D  ARG*     1.3    78.6    -      -       -      +
    792D  HIS*     1.3    66.6    +      -       -      +
    793D  TYR      4.1     3.1    -      -       -      +
----------------------------------------------------------
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Residues in contact with HIS 792 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    737D  LEU*     4.6    24.8    -      -       +      +
    738D  VAL      3.9    16.7    +      -       -      -
    739D  PRO*     4.1     2.2    -      -       -      +
    740D  PRO*     3.2    38.2    -      -       +      +
    741D  ARG*     5.4     2.0    -      -       -      +
    788D  ALA      3.0    19.1    -      -       -      +
    789D  LEU*     2.9     7.4    +      -       +      +
    791D  GLU*     1.3    83.7    -      -       +      +
    793D  TYR*     1.3    63.5    +      +       -      +
    794D  PRO*     3.5     9.0    -      -       -      +
----------------------------------------------------------
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Residues in contact with TYR 793 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    735D  ASP      3.3    20.2    -      -       -      -
    736D  VAL*     3.3     7.8    -      -       -      +
    737D  LEU*     2.5    54.8    +      -       +      -
    789D  LEU*     2.5    56.9    +      -       +      +
    790D  ARG*     3.0    19.2    -      -       -      +
    791D  GLU      4.1     3.2    -      -       -      +
    792D  HIS*     1.3    74.9    -      +       +      +
    794D  PRO*     1.3    72.0    -      -       +      +
    795D  ASP*     4.4     3.8    -      -       -      +
    797D  ASN*     3.7    16.6    -      -       -      -
    799D  ILE*     5.9     2.0    -      -       +      +
    800D  ILE*     3.8    33.8    -      -       +      +
    814D  THR*     4.3    11.6    -      -       +      +
    818D  ALA*     3.5     6.5    -      -       +      +
----------------------------------------------------------
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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