Contacts of the helix formed by residues 198 - 220 (chain L) in PDB entry 1XFB


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 ASP 198 (chain L).
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    196L  ASP      3.8     1.0    +      -       -      -
    197L  HIS*     1.3    77.9    -      -       -      +
    199L  LEU*     1.3    66.3    +      -       -      +
    200L  LYS*     3.1    36.4    +      -       -      +
    201L  ARG*     3.2    26.7    +      -       -      +
    202L  CYS      3.3     8.0    +      -       -      -
    236L  PRO*     4.1     2.7    -      -       -      -
    240L  CYS*     4.0    15.7    -      -       -      -
    242L  ILE*     4.3     8.7    -      -       +      +
    244L  TYR*     3.4    14.9    +      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 199 (chain L). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    198L  ASP*     1.3    73.7    -      -       -      +
    200L  LYS*     1.3    65.3    +      -       -      +
    202L  CYS*     3.1     4.3    +      -       -      +
    203L  GLN*     3.0    21.0    +      -       -      +
    234L  VAL*     3.3    20.0    -      -       +      +
    235L  THR*     3.2    33.7    -      -       -      -
    236L  PRO*     3.8    12.8    -      -       +      +
    244L  TYR*     3.3    43.3    +      -       +      -
    248L  GLU*     3.7    28.5    -      -       +      +
    249L  ILE*     4.4     5.6    -      -       +      -
    252L  ALA*     3.9    13.0    -      -       +      -
----------------------------------------------------------
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Residues in contact with LYS 200 (chain L). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
      4I  SER*     5.7     0.9    -      -       -      -
      6I  PRO*     4.0    25.0    -      -       -      +
    198L  ASP*     3.1    20.9    +      -       -      +
    199L  LEU*     1.3    78.9    -      -       -      +
    201L  ARG*     1.3    63.3    +      -       -      +
    203L  GLN*     3.1    10.3    +      -       -      +
    204L  TYR*     3.0    21.4    +      -       -      +
----------------------------------------------------------
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Residues in contact with ARG 201 (chain L). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
      3I  HIS*     2.5    54.9    +      -       -      +
      4I  SER*     3.7    19.1    +      -       -      +
    157J  ARG*     3.6    14.0    -      -       -      +
    154L  ILE*     3.4    19.5    -      -       +      +
    155L  SER      3.3    24.7    +      -       -      -
    156L  GLU*     4.6     0.6    +      -       -      +
    158L  THR      5.5     0.2    -      -       -      +
    159L  PRO*     4.8     1.6    -      -       -      +
    197L  HIS*     3.7    24.2    -      -       +      +
    198L  ASP*     3.2    20.0    +      -       -      +
    200L  LYS*     1.3    79.3    -      -       -      +
    202L  CYS*     1.3    64.3    +      -       -      +
    204L  TYR*     3.1     7.6    +      -       -      +
    205L  VAL*     2.9    33.4    +      -       +      +
----------------------------------------------------------
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Residues in contact with CYS 202 (chain L). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    154L  ILE*     4.1    18.1    -      -       -      +
    191L  ILE*     5.2     4.5    -      -       -      -
    192L  LEU      6.1     0.2    -      -       -      -
    197L  HIS*     4.0    12.2    -      -       +      -
    198L  ASP      3.3     3.0    +      -       -      +
    199L  LEU      3.1     9.0    +      -       -      +
    201L  ARG*     1.3    78.4    -      -       -      +
    203L  GLN*     1.3    57.9    -      -       -      +
    205L  VAL*     4.0     0.5    -      -       -      +
    206L  THR*     2.8    41.4    +      -       -      -
    232L  ASN*     4.2     6.7    -      -       -      -
    233L  MET      4.4     0.4    -      -       -      -
    234L  VAL*     3.5    11.2    -      -       -      -
    235L  THR      3.2    44.0    -      -       -      +
----------------------------------------------------------
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Residues in contact with GLN 203 (chain L). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    199L  LEU*     3.0    11.8    +      -       -      +
    200L  LYS*     3.4    12.7    -      -       -      +
    202L  CYS*     1.3    77.5    -      -       -      +
    204L  TYR*     1.3    57.1    +      -       -      +
    206L  THR*     3.2     3.3    +      -       -      -
    207L  GLU*     2.6    58.7    +      -       -      +
    234L  VAL*     3.8    16.7    -      -       +      +
    252L  ALA*     3.4    37.1    +      -       +      +
    255L  THR*     3.7    15.0    -      -       -      +
    256L  ALA*     3.9     6.2    -      -       +      +
    259L  ARG*     3.2    16.4    -      -       -      +
----------------------------------------------------------
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Residues in contact with TYR 204 (chain L). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
      3I  HIS*     3.0    50.1    +      +       +      +
      4I  SER*     3.4    32.8    -      -       -      -
      5I  TYR      5.2     0.4    -      -       -      -
    221I  HIS*     2.8    36.1    -      +       +      -
    118J  GLY      5.3     0.3    +      -       -      -
    200L  LYS      3.0    12.0    +      -       -      +
    201L  ARG*     3.3     9.0    -      -       -      +
    203L  GLN*     1.3    76.9    -      -       -      +
    205L  VAL*     1.3    67.7    +      -       -      +
    207L  GLU*     3.1    12.2    +      -       -      +
    208L  LYS*     3.0    54.0    +      -       +      +
----------------------------------------------------------
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Residues in contact with VAL 205 (chain L). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
      3I  HIS*     3.6    28.0    -      -       +      +
    154L  ILE*     3.9    24.9    -      -       +      -
    159L  PRO*     3.6    31.0    -      -       +      -
    164L  ILE*     6.0     0.4    -      -       +      -
    191L  ILE*     3.7    15.7    -      -       +      -
    201L  ARG*     2.9    26.3    +      -       +      +
    202L  CYS      4.0     0.2    -      -       -      +
    204L  TYR*     1.3    78.1    -      -       +      +
    206L  THR*     1.3    64.0    +      -       -      +
    208L  LYS*     3.2     5.9    +      -       +      +
    209L  VAL*     2.9    25.7    +      -       +      +
----------------------------------------------------------
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Residues in contact with THR 206 (chain L). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    191L  ILE*     3.4    16.4    -      -       +      +
    202L  CYS*     2.8    28.4    +      -       -      -
    203L  GLN*     3.5     5.8    -      -       -      -
    205L  VAL*     1.3    75.5    -      -       -      +
    207L  GLU*     1.3    64.8    +      -       -      +
    209L  VAL*     3.8     0.7    -      -       -      +
    210L  LEU*     2.9    45.0    +      -       +      +
    231L  PRO*     5.8     2.2    -      -       +      -
    232L  ASN*     3.3    28.3    +      -       -      +
    234L  VAL*     4.4     9.5    -      -       +      +
    256L  ALA*     4.1    15.5    -      -       +      -
    257L  LEU*     5.9     1.3    -      -       +      -
----------------------------------------------------------
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Residues in contact with GLU 207 (chain L). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    218I  SER*     5.3     0.9    -      -       -      -
    203L  GLN*     2.6    51.3    +      -       -      +
    204L  TYR*     3.1    12.1    +      -       +      +
    206L  THR*     1.3    78.1    -      -       -      +
    208L  LYS*     1.3    62.8    +      -       +      +
    210L  LEU*     4.8     0.4    -      -       -      -
    211L  ALA*     2.9    30.7    +      -       -      +
    256L  ALA*     3.7    23.7    -      -       -      +
    259L  ARG*     3.0    31.3    +      -       -      +
    260L  THR*     3.4    15.8    -      -       +      +
----------------------------------------------------------
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Residues in contact with LYS 208 (chain L). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    215I  LYS*     5.5     0.7    -      -       -      -
    218I  SER*     2.4    45.3    +      -       -      +
    219I  ASP*     4.5     3.3    -      -       -      +
    221I  HIS*     3.0    21.9    +      -       -      +
    164L  ILE*     4.7    13.5    -      -       +      +
    204L  TYR*     3.0    61.3    +      -       +      +
    205L  VAL*     3.7     6.7    -      -       -      +
    207L  GLU*     1.3    75.7    -      -       -      +
    209L  VAL*     1.3    67.6    +      -       +      +
    211L  ALA*     3.4     6.4    +      -       -      +
    212L  ALA*     3.1    21.7    +      -       -      +
----------------------------------------------------------
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Residues in contact with VAL 209 (chain L). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    152L  LEU*     3.3    36.6    -      -       +      -
    159L  PRO*     4.8     0.7    -      -       +      -
    164L  ILE*     4.4    21.9    -      -       +      +
    189L  PRO*     4.2    15.0    -      -       +      +
    191L  ILE*     3.6    19.1    -      -       +      -
    205L  VAL*     2.9    28.2    +      -       +      +
    206L  THR      3.8     3.1    -      -       -      +
    208L  LYS*     1.3    76.1    -      -       -      +
    210L  LEU*     1.3    66.0    +      -       +      +
    212L  ALA*     3.0     5.7    +      -       -      +
    213L  VAL*     2.9    36.9    +      -       +      +
----------------------------------------------------------
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Residues in contact with LEU 210 (chain L). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    189L  PRO*     4.0    17.5    -      -       +      -
    191L  ILE*     6.5     0.2    -      -       +      -
    206L  THR*     2.9    38.7    +      -       +      +
    207L  GLU      4.0     0.4    -      -       -      +
    209L  VAL*     1.3    76.9    -      -       +      +
    211L  ALA*     1.3    64.9    +      -       -      +
    213L  VAL*     2.9    16.0    +      -       +      +
    214L  TYR*     2.9    24.2    +      -       +      -
    229L  LEU*     3.9    33.4    -      -       +      -
    231L  PRO*     4.7     7.0    -      -       +      -
    256L  ALA      5.0     0.9    -      -       -      +
    257L  LEU*     3.8    26.5    -      -       +      -
    260L  THR*     3.5    28.7    -      -       +      +
----------------------------------------------------------
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Residues in contact with ALA 211 (chain L). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    215I  LYS*     3.7    13.7    -      -       +      +
    218I  SER*     3.4    32.1    -      -       -      +
    207L  GLU      2.9    19.6    +      -       -      +
    208L  LYS      3.6     4.5    -      -       -      +
    209L  VAL      3.3     0.2    -      -       -      -
    210L  LEU*     1.3    76.6    -      -       -      +
    212L  ALA*     1.3    61.9    +      -       -      +
    214L  TYR*     3.8     3.8    +      -       -      +
    215L  LYS*     3.3    21.1    +      -       -      +
    260L  THR*     4.1    15.8    -      -       +      +
----------------------------------------------------------
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Residues in contact with ALA 212 (chain L). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    215I  LYS*     3.7    20.4    -      -       -      +
    164L  ILE*     3.5    29.2    -      -       +      -
    165L  LEU*     6.1     0.4    -      -       -      -
    168L  ALA*     4.1     9.9    -      -       +      +
    208L  LYS      3.1     7.2    +      -       -      +
    209L  VAL      3.0     9.7    +      -       -      +
    211L  ALA*     1.3    75.3    -      -       -      +
    213L  VAL*     1.3    67.6    +      -       -      +
    215L  LYS*     3.2     3.3    +      -       -      +
    216L  ALA*     3.0    23.6    +      -       -      +
----------------------------------------------------------
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Residues in contact with VAL 213 (chain L). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    168L  ALA*     4.0    16.3    -      -       +      +
    171L  LEU*     4.2    12.8    -      -       +      -
    187L  VAL*     3.9    27.6    -      -       +      -
    189L  PRO*     4.1    17.9    -      -       +      -
    209L  VAL*     2.9    35.2    +      -       +      +
    210L  LEU*     3.3    12.1    -      -       +      +
    212L  ALA*     1.3    75.9    -      -       -      +
    214L  TYR*     1.3    65.4    -      -       +      +
    216L  ALA*     3.3     4.4    +      -       -      +
    217L  LEU*     3.0    35.2    +      -       +      +
    229L  LEU*     5.3     1.1    -      -       +      -
----------------------------------------------------------
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Residues in contact with TYR 214 (chain L). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    187L  VAL*     5.7     1.6    -      -       -      +
    210L  LEU*     2.9    26.0    +      -       +      +
    211L  ALA*     4.5     2.5    -      -       -      +
    213L  VAL*     1.3    78.3    -      -       +      +
    215L  LYS*     1.3    66.2    +      -       -      +
    217L  LEU*     3.2    16.3    +      -       +      +
    218L  SER*     2.9    22.2    +      -       -      -
    224L  LEU*     3.6    36.4    -      -       +      +
    227L  THR*     5.1     2.9    +      -       -      -
    228L  LEU      5.2     0.7    -      -       -      -
    229L  LEU*     3.4    40.2    -      -       +      +
    260L  THR      3.9    16.8    -      -       -      +
    261L  VAL*     3.7    22.4    -      -       +      +
    262L  PRO*     3.7    19.1    -      -       +      -
    265L  VAL*     3.5    24.9    -      -       +      +
----------------------------------------------------------
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Residues in contact with LYS 215 (chain L). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    208I  LYS      5.6     0.4    -      -       -      -
    211I  ALA*     3.8    23.6    -      -       +      +
    212I  ALA*     3.9    26.9    -      -       -      +
    215I  LYS*     3.9    30.1    -      -       +      -
    211L  ALA      3.3    16.4    +      -       -      +
    212L  ALA      3.2     5.6    +      -       -      +
    214L  TYR*     1.3    77.4    -      -       -      +
    216L  ALA*     1.3    58.1    +      -       -      +
    218L  SER*     3.2     4.9    +      -       -      -
    219L  ASP*     2.9    67.6    +      -       -      +
----------------------------------------------------------
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Residues in contact with ALA 216 (chain L). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    168L  ALA*     3.4    35.2    -      -       +      +
    169L  ASN*     4.3     4.3    -      -       -      +
    172L  ALA*     3.8     6.1    -      -       +      -
    212L  ALA      3.0    12.0    +      -       -      +
    213L  VAL      3.4     8.1    -      -       -      +
    215L  LYS*     1.3    75.5    -      -       -      +
    217L  LEU*     1.3    67.9    +      -       -      +
    219L  ASP*     2.9    10.8    +      -       -      +
    220L  HIS*     2.9    29.4    +      -       +      -
----------------------------------------------------------
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Residues in contact with LEU 217 (chain L). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    168L  ALA      5.8     0.2    -      -       -      +
    171L  LEU      4.8     0.2    -      -       -      -
    172L  ALA*     3.7    21.8    -      -       +      +
    175L  ALA*     3.9     9.0    -      -       +      -
    187L  VAL*     4.4    17.9    -      -       +      -
    213L  VAL*     3.0    27.9    +      -       +      +
    214L  TYR*     3.5    39.3    -      -       +      +
    216L  ALA*     1.3    75.9    -      -       -      +
    218L  SER*     1.3    63.3    +      -       -      +
    220L  HIS      3.2     1.6    +      -       -      -
    221L  HIS      3.1     3.8    +      -       -      -
    222L  VAL*     3.0    59.9    +      -       +      -
    224L  LEU*     4.0    15.5    -      -       +      -
    227L  THR*     5.5     2.0    -      -       +      +
----------------------------------------------------------
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Residues in contact with SER 218 (chain L). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    207I  GLU      5.0     0.3    +      -       -      -
    208I  LYS*     2.5    43.4    +      -       -      +
    211I  ALA*     3.5    29.6    -      -       -      +
    214L  TYR      2.9    13.1    +      -       -      -
    215L  LYS*     3.3    10.8    -      -       -      -
    217L  LEU*     1.3    76.1    -      -       -      +
    219L  ASP*     1.3    59.8    +      -       -      +
    221L  HIS*     2.9    13.1    +      -       -      +
    222L  VAL      5.0     2.9    -      -       -      +
----------------------------------------------------------
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Residues in contact with ASP 219 (chain L). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    208I  LYS*     4.7     3.6    -      -       -      +
    162K  LEU*     3.2    25.1    -      -       +      +
    165K  LEU*     3.7    25.4    -      -       +      +
    215L  LYS*     2.9    52.6    +      -       -      +
    216L  ALA*     2.9    11.2    +      -       -      +
    218L  SER*     1.3    77.3    +      -       -      +
    220L  HIS*     1.3    66.7    +      -       +      +
    221L  HIS*     3.4    12.4    +      -       -      -
----------------------------------------------------------
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Residues in contact with HIS 220 (chain L). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    116K  LEU*     5.3     3.7    -      -       +      +
    117K  ALA      3.7     5.5    -      -       -      +
    162K  LEU*     3.6    30.0    -      -       +      +
    165K  LEU*     4.2     2.6    -      -       -      +
    166K  GLU*     3.9    12.1    -      -       +      -
    169L  ASN*     2.8    28.7    +      -       -      -
    172L  ALA*     3.4    29.3    -      -       +      +
    173L  ARG*     3.8    35.2    +      -       +      +
    176L  SER*     3.7    18.4    +      -       -      -
    216L  ALA*     2.9    22.9    +      -       -      +
    217L  LEU      3.9     2.9    -      -       -      +
    218L  SER      3.1     0.4    -      -       -      -
    219L  ASP*     1.3    80.1    -      -       +      +
    221L  HIS*     1.3    74.0    +      -       -      +
    222L  VAL*     3.3     3.4    +      -       +      -
----------------------------------------------------------
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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