Contacts of the helix formed by residues 343 - 370 (chain O) in PDB entry 5LN3


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 LEU 343 (chain O).
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    341O  LEU*     3.6    21.9    +      -       +      +
    342O  ASP*     1.4    71.0    -      -       -      +
    344O  GLN*     1.4    80.3    +      -       -      +
    345O  GLN      3.5     0.7    -      -       -      -
    346O  ILE*     3.5    26.4    -      -       +      +
    347O  LYS*     3.1    26.5    +      -       +      +
    211U  TYR*     5.5     5.2    -      -       +      +
    215U  VAL*     3.9    39.0    -      -       +      -
----------------------------------------------------------
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Residues in contact with GLN 344 (chain O). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    342O  ASP      2.7    12.7    +      -       -      +
    343O  LEU*     1.4    90.9    +      -       -      +
    345O  GLN*     1.4    63.4    +      -       +      +
    346O  ILE      3.1     1.8    -      -       -      -
    347O  LYS*     3.1    47.4    +      -       +      +
    348O  GLY*     3.6     3.8    +      -       -      -
----------------------------------------------------------
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Residues in contact with GLN 345 (chain O). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    279O  GLU*     3.9    27.9    +      -       -      +
    282O  PHE*     3.3    33.5    -      -       +      +
    283O  THR*     5.3     2.9    -      -       +      +
    339O  ARG*     4.3    11.9    +      -       -      +
    342O  ASP*     3.2    41.3    +      -       +      +
    344O  GLN*     1.4    75.1    -      -       +      +
    346O  ILE*     1.4    57.0    +      -       +      +
    348O  GLY*     3.4     4.3    +      -       -      -
    349O  MET*     3.0    26.8    +      -       -      +
    352O  ARG*     5.2     3.3    +      -       -      -
    231U  GLN*     4.2    12.1    -      -       -      +
----------------------------------------------------------
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Residues in contact with ILE 346 (chain O). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    342O  ASP*     3.7    27.8    -      -       +      +
    343O  LEU*     3.5    18.8    -      -       +      +
    344O  GLN      3.1     0.2    -      -       -      -
    345O  GLN*     1.4    75.6    -      -       +      +
    347O  LYS*     1.4    61.2    +      -       +      +
    349O  MET*     3.0    21.0    +      -       +      +
    350O  LYS*     3.1    13.0    +      -       -      +
    208U  ILE*     4.4    13.6    -      -       +      +
    211U  TYR*     3.7    32.8    -      -       +      -
    212U  LEU*     5.8     6.7    -      -       +      +
    215U  VAL*     6.3     0.7    -      -       +      -
    227U  ILE*     3.6    36.8    -      -       +      -
    230U  LEU*     4.9    11.0    -      -       +      -
    231U  GLN*     4.7     6.5    -      -       -      +
----------------------------------------------------------
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Residues in contact with LYS 347 (chain O). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    343O  LEU*     3.1    32.3    +      -       +      +
    344O  GLN*     3.1    40.9    +      -       +      +
    346O  ILE*     1.4    77.5    -      -       +      +
    348O  GLY*     1.4    59.3    +      -       -      +
    350O  LYS*     3.3    27.2    -      -       -      +
    351O  ASP*     3.6    10.4    -      -       -      +
    212U  LEU*     4.2    27.6    -      -       +      -
----------------------------------------------------------
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Residues in contact with GLY 348 (chain O). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    344O  GLN      3.6     4.3    +      -       -      -
    345O  GLN*     3.4     7.5    +      -       -      -
    346O  ILE      3.3     0.2    -      -       -      -
    347O  LYS*     1.4    73.9    -      -       -      +
    349O  MET*     1.4    62.0    +      -       -      +
    350O  LYS      3.2     0.7    -      -       -      -
    351O  ASP*     3.3    14.3    +      -       -      +
    352O  ARG*     3.1    30.3    +      -       -      +
----------------------------------------------------------
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Residues in contact with MET 349 (chain O). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    282O  PHE*     5.8     0.4    -      -       -      -
    345O  GLN      3.0    15.3    +      -       -      +
    346O  ILE*     3.0    15.8    +      -       +      +
    348O  GLY*     1.4    74.2    -      -       -      +
    350O  LYS*     1.4    57.5    +      -       -      +
    352O  ARG*     3.2    33.8    +      -       -      +
    353O  LEU*     3.1    50.7    +      -       +      +
    356O  TRP*     5.7     1.6    -      -       +      -
    204U  LYS*     6.3     0.2    -      -       -      +
    208U  ILE*     4.9     6.5    -      -       +      -
    230U  LEU*     4.1    47.3    -      -       +      +
    231U  GLN*     5.3     4.7    -      -       -      +
    233U  VAL*     5.1     5.8    -      -       +      -
    234U  PHE*     3.8    27.4    -      -       +      -
----------------------------------------------------------
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Residues in contact with LYS 350 (chain O). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    346O  ILE      3.1     6.3    +      -       -      +
    347O  LYS*     3.3    17.4    -      -       -      +
    348O  GLY      3.2     0.2    -      -       -      -
    349O  MET*     1.4    75.7    -      -       -      +
    351O  ASP*     1.3    68.9    +      -       -      +
    353O  LEU*     3.7     4.6    +      -       -      +
    354O  GLU*     3.5    21.7    +      -       -      +
    205U  LEU*     4.0     2.4    -      -       +      +
    208U  ILE*     3.9    28.2    -      -       +      +
    209U  ARG*     3.6    47.8    +      -       +      +
    212U  LEU*     3.9    40.9    -      -       +      +
----------------------------------------------------------
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Residues in contact with ASP 351 (chain O). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    347O  LYS      3.6    15.6    -      -       -      +
    348O  GLY*     3.3    13.2    +      -       -      +
    350O  LYS*     1.3    81.7    -      -       -      +
    352O  ARG*     1.3    65.3    +      -       +      +
    354O  GLU*     3.2    21.0    -      -       -      +
    355O  PHE*     3.3    30.9    +      -       +      -
    209U  ARG*     5.2     1.3    +      -       -      +
----------------------------------------------------------
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Residues in contact with ARG 352 (chain O). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    282O  PHE*     3.9    17.6    +      -       -      -
    283O  THR      4.3     3.5    -      -       -      -
    284O  ARG*     3.2    44.7    +      -       -      +
    285O  PRO*     5.9     0.2    -      -       -      -
    345O  GLN*     5.2     3.0    +      -       -      +
    348O  GLY      3.1    16.1    +      -       -      +
    349O  MET*     3.2    36.5    +      -       -      +
    351O  ASP*     1.3    77.2    -      -       +      +
    353O  LEU*     1.3    63.3    +      -       -      +
    355O  PHE*     3.2    34.1    +      -       +      +
    356O  TRP*     3.3    11.1    +      -       -      +
    234U  PHE*     3.4    46.1    -      -       +      -
----------------------------------------------------------
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Residues in contact with LEU 353 (chain O). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    349O  MET*     3.1    33.7    +      -       +      +
    350O  LYS*     3.8     5.6    -      -       -      +
    352O  ARG*     1.3    77.8    -      -       -      +
    354O  GLU*     1.4    56.2    -      -       -      +
    356O  TRP*     3.1    49.9    +      -       +      +
    357O  CYS*     3.2    19.4    -      -       -      -
    201U  LEU*     4.6     7.9    -      -       +      +
    204U  LYS*     4.0    28.0    -      -       +      -
    205U  LEU*     3.7    39.0    -      -       +      +
    208U  ILE*     3.8    21.5    -      -       +      -
    230U  LEU*     6.4     1.3    -      -       +      -
----------------------------------------------------------
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Residues in contact with GLU 354 (chain O). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    350O  LYS      3.5    12.5    +      -       -      +
    351O  ASP*     3.2    16.8    -      -       -      +
    353O  LEU*     1.4    73.3    -      -       -      +
    355O  PHE*     1.4    67.4    +      -       +      +
    357O  CYS*     3.3    13.7    +      -       -      +
    358O  THR*     3.3    16.9    +      -       -      +
    205U  LEU*     3.3    22.6    -      -       -      +
    209U  ARG*     3.1    29.1    +      -       -      +
----------------------------------------------------------
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Residues in contact with PHE 355 (chain O). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    351O  ASP*     3.3    33.2    -      -       +      -
    352O  ARG*     3.2    28.2    +      -       +      +
    354O  GLU*     1.4    80.9    -      -       +      +
    356O  TRP*     1.3    62.4    +      -       -      +
    358O  THR*     3.3    18.3    +      -       -      -
    359O  ASP*     2.9    23.5    +      -       -      +
----------------------------------------------------------
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Residues in contact with TRP 356 (chain O). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    349O  MET*     5.7     1.3    -      -       +      -
    352O  ARG      3.3     6.8    +      -       -      +
    353O  LEU*     3.1    40.0    +      -       +      +
    355O  PHE*     1.3    78.6    -      -       -      +
    357O  CYS*     1.4    60.1    +      -       -      +
    358O  THR      3.3     0.5    +      -       -      -
    359O  ASP*     3.3    15.8    +      -       +      +
    360O  VAL*     3.5    18.5    +      -       +      +
    435P  LEU*     4.0    39.3    -      -       +      -
    201U  LEU*     4.0    24.7    -      -       +      +
    204U  LYS*     5.6     3.4    -      -       -      -
    233U  VAL*     4.9    20.0    -      -       +      -
    234U  PHE*     5.0    20.0    -      +       -      -
    237U  LEU*     5.6     1.6    -      -       +      -
    238U  PRO*     3.6    40.3    -      -       +      +
    240U  VAL*     6.1     0.4    -      -       -      +
    241U  SER*     4.2    15.0    +      -       -      -
    242U  LEU*     5.7     6.5    -      -       +      -
----------------------------------------------------------
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Residues in contact with CYS 357 (chain O). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    353O  LEU*     3.2    24.0    +      -       -      -
    354O  GLU*     3.3    12.0    +      -       -      +
    356O  TRP*     1.4    74.6    -      -       -      +
    358O  THR*     1.4    61.1    +      -       -      +
    360O  VAL*     3.6     1.0    +      -       -      +
    361O  LYS*     3.3    15.2    +      -       -      +
    198U  LEU*     3.2    22.7    -      -       -      +
    201U  LEU*     3.7    39.3    -      -       +      -
    202U  ASN*     3.9    17.9    -      -       -      +
    205U  LEU*     4.1    22.7    -      -       +      -
----------------------------------------------------------
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Residues in contact with THR 358 (chain O). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    354O  GLU*     3.3    15.4    +      -       -      +
    355O  PHE*     3.4    10.5    +      -       -      -
    356O  TRP      3.3     0.4    -      -       -      -
    357O  CYS*     1.4    73.9    -      -       -      +
    359O  ASP*     1.3    67.6    +      -       -      +
    361O  LYS*     3.0    33.9    +      -       +      +
    362O  SER*     3.2    17.8    +      -       -      +
----------------------------------------------------------
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Residues in contact with ASP 359 (chain O). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    355O  PHE*     2.9    27.6    +      -       -      +
    356O  TRP*     3.3    10.8    +      -       +      +
    358O  THR*     1.3    81.6    -      -       -      +
    360O  VAL*     1.4    62.4    +      -       -      +
    361O  LYS      3.3     0.2    +      -       -      -
    362O  SER*     3.4    13.5    +      -       -      -
    363O  MET*     3.6    10.2    +      -       -      +
    241U  SER*     4.0    26.6    -      -       -      +
    242U  LEU*     4.9    15.0    -      -       -      +
----------------------------------------------------------
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Residues in contact with VAL 360 (chain O). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    356O  TRP*     3.5    18.5    +      -       +      +
    357O  CYS      4.2     1.3    -      -       -      +
    358O  THR      3.4     0.2    -      -       -      -
    359O  ASP*     1.4    76.7    -      -       -      +
    361O  LYS*     1.3    63.9    +      -       -      +
    363O  MET*     3.2    10.2    +      -       +      +
    364O  GLU*     3.1    19.8    +      -       -      +
    194U  GLN*     4.2    20.6    -      -       -      +
    197U  GLY*     4.9     2.0    -      -       -      -
    198U  LEU*     4.3    28.3    -      -       +      +
    201U  LEU*     4.0    24.7    -      -       +      -
    240U  VAL*     4.8    18.6    -      -       +      -
    241U  SER*     4.9     4.7    -      -       -      +
----------------------------------------------------------
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Residues in contact with LYS 361 (chain O). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    357O  CYS*     3.3    25.5    +      -       -      +
    358O  THR*     3.0    32.0    +      -       +      +
    360O  VAL*     1.3    76.1    -      -       -      +
    362O  SER*     1.4    54.7    -      -       -      +
    364O  GLU*     3.1    24.8    -      -       -      +
    365O  MET*     3.1    35.0    +      -       +      +
    198U  LEU*     4.0    29.4    -      -       +      +
    202U  ASN*     5.1     5.3    -      -       -      +
----------------------------------------------------------
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Residues in contact with SER 362 (chain O). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    358O  THR*     3.2    17.8    +      -       -      +
    359O  ASP*     3.6     9.5    +      -       -      -
    361O  LYS*     1.4    73.6    -      -       -      +
    363O  MET*     1.4    64.6    +      -       -      +
    365O  MET*     3.2    19.2    +      -       -      +
    366O  LEU*     3.5     9.9    +      -       -      +
----------------------------------------------------------
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Residues in contact with MET 363 (chain O). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    359O  ASP      3.6     5.4    +      -       -      +
    360O  VAL*     3.2    16.8    +      -       +      +
    362O  SER*     1.4    77.6    -      -       -      +
    364O  GLU*     1.4    63.2    +      -       -      +
    366O  LEU*     3.3    15.1    +      -       -      +
    367O  VAL*     3.5    21.9    +      -       +      +
    335T  LEU*     4.9    14.6    -      -       +      -
    339T  VAL*     6.5     0.4    -      -       +      -
    190U  ARG*     3.6    33.7    -      -       -      +
    194U  GLN*     3.4    46.7    -      -       +      +
    240U  VAL*     5.5    11.2    -      -       +      +
----------------------------------------------------------
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Residues in contact with GLU 364 (chain O). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    360O  VAL*     3.1     9.2    +      -       -      +
    361O  LYS      3.1    14.6    -      -       -      +
    362O  SER      3.1     0.2    -      -       -      -
    363O  MET*     1.4    80.8    -      -       -      +
    365O  MET*     1.3    67.7    +      -       +      +
    367O  VAL*     3.2    14.2    +      -       +      +
    368O  GLU*     3.1    40.2    +      -       +      +
    191U  ILE*     5.6     0.7    -      -       +      +
    194U  GLN*     3.1    32.6    -      -       +      +
    195U  VAL*     3.4    34.2    -      -       +      +
    198U  LEU*     3.6    28.0    -      -       -      +
----------------------------------------------------------
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Residues in contact with MET 365 (chain O). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    361O  LYS*     3.1    39.4    +      -       +      +
    362O  SER*     3.2    10.7    +      -       -      +
    364O  GLU*     1.3    83.4    -      -       +      +
    366O  LEU*     1.3    64.0    +      -       -      +
    368O  GLU*     3.2    33.3    +      -       -      +
    369O  HIS*     3.0    42.0    +      -       -      +
    198U  LEU*     6.1     0.4    -      -       +      -
----------------------------------------------------------
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Residues in contact with LEU 366 (chain O). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    362O  SER      3.5     6.9    +      -       -      +
    363O  MET*     3.3    10.0    +      -       -      +
    364O  GLU      3.2     1.0    -      -       -      -
    365O  MET*     1.3    79.8    -      -       -      +
    367O  VAL*     1.3    58.8    +      -       +      +
    369O  HIS*     3.2    17.9    +      -       +      +
    370O  GLN*     2.6    54.3    -      -       -      +
    336T  ALA*     3.6    44.4    -      -       +      +
    339T  VAL*     4.1    15.0    -      -       +      -
    340T  ILE*     6.0     3.4    -      -       +      -
----------------------------------------------------------
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Residues in contact with VAL 367 (chain O). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    363O  MET*     3.5    26.4    +      -       +      +
    364O  GLU*     3.2    29.1    +      -       +      +
    366O  LEU*     1.3    72.6    -      -       -      +
    368O  GLU*     1.4    57.3    +      -       +      +
    369O  HIS      3.5     0.2    +      -       -      -
    370O  GLN*     2.8    28.8    +      -       -      +
    339T  VAL*     4.3    23.8    -      -       +      -
    190U  ARG*     5.5     8.3    -      -       +      +
    191U  ILE*     3.8    40.2    -      -       +      +
    194U  GLN*     4.4    13.7    -      -       +      -
----------------------------------------------------------
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Residues in contact with GLU 368 (chain O). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    364O  GLU*     3.1    37.2    +      -       +      +
    365O  MET*     3.3    41.1    -      -       -      +
    367O  VAL*     1.4    75.7    -      -       +      +
    369O  HIS*     1.4    71.1    +      -       +      +
    370O  GLN      3.4     3.8    +      -       -      +
    371O  ALA      4.2     5.9    -      -       -      +
    191U  ILE*     5.1    12.3    -      -       +      -
    195U  VAL*     5.7     3.6    -      -       +      -
----------------------------------------------------------
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Residues in contact with HIS 369 (chain O). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    365O  MET*     3.0    38.8    +      -       +      +
    366O  LEU*     3.2    16.9    +      -       +      +
    368O  GLU*     1.4    83.3    -      -       +      +
    370O  GLN*     1.3    77.9    +      -       -      +
    371O  ALA      3.7     0.5    +      -       -      -
    348T  MET*     3.7    14.6    -      -       -      +
----------------------------------------------------------
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Residues in contact with GLN 370 (chain O). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    366O  LEU*     2.6    46.5    +      -       -      +
    367O  VAL      2.8    19.0    -      -       -      +
    369O  HIS*     1.3    96.2    -      -       -      +
    371O  ALA*     1.4    64.8    +      -       -      +
    339T  VAL*     3.4    18.5    -      -       +      +
    340T  ILE*     5.1     3.0    -      -       +      +
    343T  ALA*     4.0    16.6    -      -       +      -
    348T  MET*     3.9     9.2    -      -       +      -
    350T  VAL*     3.7    43.2    -      -       +      +
    191U  ILE*     4.6     2.4    -      -       -      +
----------------------------------------------------------
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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