Contacts of the helix formed by residues 81 - 104 (chain S) in PDB entry 3TDD


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 81 (chain S).
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     15R  PHE*     4.2    22.2    -      -       +      -
     19R  GLY      5.3     4.0    -      -       -      +
     20R  ARG*     6.5     0.2    -      -       -      -
     21R  LEU*     4.5    10.1    -      -       +      -
    121R  LEU*     5.0     4.7    -      -       +      -
    156R  THR*     6.0     3.4    -      -       +      -
     30S  ALA*     4.9    10.1    -      -       +      -
     80S  GLY*     1.3    70.4    -      -       -      -
     82S  ALA*     1.3    67.9    +      -       -      +
     83S  PRO*     4.2     8.3    -      -       +      -
     84S  ASP*     3.3    31.9    +      -       -      +
     85S  ALA      3.3     7.6    +      -       -      -
    130S  ARG*     4.1    14.6    -      -       -      +
    133S  GLY*     2.7    21.8    +      -       -      +
    134S  VAL*     3.6    10.4    -      -       -      +
----------------------------------------------------------
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Residues in contact with ALA 82 (chain S). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    156R  THR*     4.4    11.3    -      -       +      +
     64S  GLN*     3.2    32.3    -      -       -      +
     65S  LYS      6.0     0.4    -      -       -      +
     78S  LEU*     4.5    16.7    -      -       +      +
     80S  GLY      3.2     5.8    +      -       -      -
     81S  LEU*     1.3    70.5    -      -       -      +
     83S  PRO*     1.3    74.5    -      -       +      +
     85S  ALA*     2.9    15.6    +      -       -      +
     86S  ARG*     3.0    11.8    +      -       -      +
----------------------------------------------------------
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Residues in contact with PRO 83 (chain S). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    121R  LEU*     3.6    24.2    -      -       +      -
    154R  SER      3.2    24.7    -      -       -      +
    155R  GLY*     3.8    15.0    -      -       -      +
    156R  THR*     3.5    15.9    -      -       +      -
     81S  LEU*     3.5     9.2    -      -       +      -
     82S  ALA*     1.3    93.2    -      -       +      +
     84S  ASP*     1.3    62.6    +      -       -      +
     86S  ARG*     3.0    22.5    +      -       +      +
     87S  VAL*     3.0    18.1    +      -       -      +
----------------------------------------------------------
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Residues in contact with ASP 84 (chain S). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    121R  LEU*     4.0     6.2    -      -       -      +
     81S  LEU*     3.3    17.1    +      -       -      +
     82S  ALA      3.1     0.8    +      -       -      -
     83S  PRO*     1.3    76.5    -      -       -      +
     85S  ALA*     1.3    57.8    +      -       -      +
     87S  VAL*     3.3    11.2    +      -       -      +
     88S  LEU*     2.9    32.4    +      -       -      +
    130S  ARG*     2.8    37.9    +      -       -      -
    132S  TYR*     3.3    16.3    -      -       +      -
    133S  GLY*     2.7    27.4    +      -       -      -
    134S  VAL*     3.8    17.3    -      -       +      -
----------------------------------------------------------
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Residues in contact with ALA 85 (chain S). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     68S  ILE*     4.5     4.3    -      -       +      -
     78S  LEU*     3.6    41.5    -      -       +      -
     81S  LEU      3.3     7.3    +      -       -      +
     82S  ALA      2.9    10.3    +      -       -      +
     84S  ASP*     1.3    77.8    -      -       -      +
     86S  ARG*     1.3    55.1    +      -       -      +
     88S  LEU*     3.9     2.0    -      -       -      +
     89S  SER*     2.7    40.1    +      -       -      -
    134S  VAL*     3.9    10.7    -      -       +      +
    136S  LEU*     4.1     9.7    -      -       +      +
----------------------------------------------------------
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Residues in contact with ARG 86 (chain S). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    114R  GLN*     3.2    45.2    -      -       -      +
    115R  SER*     5.8     0.2    -      -       -      +
    118R  ASP*     2.7    40.3    +      -       -      -
     65S  LYS*     6.2     0.2    -      -       -      +
     68S  ILE*     4.7     5.8    -      -       +      +
     82S  ALA      3.0     8.7    +      -       -      +
     83S  PRO*     3.0    16.7    +      -       +      +
     85S  ALA*     1.3    76.9    -      -       -      +
     87S  VAL*     1.3    57.6    +      -       +      +
     89S  SER*     3.1     7.3    +      -       -      -
     90S  ASN*     3.0    46.5    +      -       +      +
     93S  ARG*     5.3     7.5    -      -       -      +
     69Z  ASP*     5.3     7.9    +      -       -      -
----------------------------------------------------------
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Residues in contact with VAL 87 (chain S). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    126R  ARG*     6.1     6.1    -      -       -      +
     83S  PRO*     3.0    18.8    +      -       +      +
     84S  ASP*     3.5    12.3    -      -       -      +
     85S  ALA      3.2     0.2    -      -       -      -
     86S  ARG*     1.3    79.7    -      -       +      +
     88S  LEU*     1.3    58.6    +      -       -      +
     90S  ASN*     3.6     4.8    -      -       -      +
     91S  TYR*     3.1    25.3    +      -       -      +
    119S  LYS*     5.0     8.3    -      -       -      +
    132S  TYR*     3.8    26.9    -      -       +      +
----------------------------------------------------------
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Residues in contact with LEU 88 (chain S). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     76S  LEU*     5.4     0.2    -      -       -      -
     84S  ASP      2.9    16.9    +      -       -      +
     85S  ALA      3.9     2.0    -      -       -      +
     87S  VAL*     1.3    76.0    -      -       -      +
     89S  SER*     1.3    60.0    +      -       -      +
     91S  TYR*     3.3     6.4    +      -       -      +
     92S  LEU*     3.0    25.5    +      -       -      +
    116S  LEU*     3.8    26.9    -      -       +      +
    119S  LYS*     3.8    22.4    -      -       +      -
    120S  ALA      5.3     0.7    -      -       -      +
    132S  TYR*     3.6    39.9    -      -       +      -
    134S  VAL*     4.0     8.7    -      -       +      -
    136S  LEU*     4.0    18.8    -      -       +      -
    151S  PHE*     3.5    35.9    -      -       +      -
----------------------------------------------------------
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Residues in contact with SER 89 (chain S). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     68S  ILE*     3.8    34.6    -      -       -      +
     70S  CYS*     4.1     3.4    -      -       -      -
     76S  LEU*     4.1    20.1    -      -       -      +
     85S  ALA      2.7    26.5    +      -       -      -
     86S  ARG*     3.1    11.3    +      -       -      -
     88S  LEU*     1.3    70.5    -      -       -      +
     90S  ASN*     1.3    58.0    +      -       -      +
     92S  LEU*     3.0     8.4    +      -       -      +
     93S  ARG*     2.7    42.3    +      -       -      +
----------------------------------------------------------
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Residues in contact with ASN 90 (chain S). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     86S  ARG*     3.0    32.3    +      -       +      +
     87S  VAL*     3.6     6.7    -      -       -      +
     89S  SER*     1.3    83.7    +      -       -      +
     91S  TYR*     1.3    60.7    +      -       -      +
     93S  ARG*     3.2    18.5    +      -       -      +
     94S  GLN*     3.1    46.3    +      -       -      +
     65Z  TRP*     3.8    23.9    -      -       -      -
     69Z  ASP*     5.0     4.4    +      -       -      -
----------------------------------------------------------
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Residues in contact with TYR 91 (chain S). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     87S  VAL      3.1    14.3    +      -       -      +
     88S  LEU      3.5    10.5    -      -       -      +
     89S  SER      3.2     0.2    -      -       -      -
     90S  ASN*     1.3    76.7    -      -       -      +
     92S  LEU*     1.3    60.4    +      -       +      +
     94S  GLN*     3.4    16.7    +      -       -      +
     95S  GLN*     3.1    65.1    +      -       +      +
    115S  LEU*     4.0    40.0    +      -       +      +
    116S  LEU*     4.4     9.9    -      -       +      -
    119S  LYS*     3.5    43.8    -      -       +      +
    122S  LYS*     5.9     0.7    +      -       -      -
----------------------------------------------------------
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Residues in contact with LEU 92 (chain S). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     70S  CYS*     3.5    27.6    -      -       +      -
     74S  MET*     4.1    18.4    -      -       -      -
     76S  LEU*     4.4    10.1    -      -       +      -
     88S  LEU      3.0    13.3    +      -       -      +
     89S  SER*     3.0     8.3    +      -       -      +
     91S  TYR*     1.3    79.3    -      -       +      +
     93S  ARG*     1.3    64.4    +      -       -      +
     95S  GLN*     3.3     6.0    +      -       +      -
     96S  CYS*     2.9    24.4    +      -       -      -
    107S  LEU*     4.4     7.9    -      -       +      -
    112S  ALA*     3.5    36.6    -      -       +      +
    115S  LEU*     5.3     2.2    -      -       +      -
    116S  LEU*     4.4    22.7    -      -       +      -
    138S  ILE*     4.6     8.3    -      -       +      -
----------------------------------------------------------
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Residues in contact with ARG 93 (chain S). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     68S  ILE*     3.4    22.7    -      -       -      +
     69S  LYS*     2.8    26.6    +      -       -      +
     70S  CYS*     3.5    29.8    -      -       +      +
     86S  ARG*     5.3     7.3    -      -       -      +
     89S  SER*     2.7    23.8    +      -       -      +
     90S  ASN*     3.2    25.0    +      -       -      +
     92S  LEU*     1.3    74.8    -      -       -      +
     94S  GLN*     1.3    56.5    +      -       -      +
     96S  CYS*     3.7     2.1    -      -       -      +
     97S  ASN*     3.0    28.9    +      -       -      +
     64Z  LYS*     5.4     0.9    +      -       -      -
     65Z  TRP*     3.6    19.4    -      -       +      -
     68Z  PHE*     3.4    60.4    +      -       +      +
     69Z  ASP*     4.8     2.6    +      -       -      -
----------------------------------------------------------
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Residues in contact with GLN 94 (chain S). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     90S  ASN*     3.1    27.7    +      -       -      +
     91S  TYR*     3.7    22.2    -      -       -      +
     92S  LEU      3.2     0.2    -      -       -      -
     93S  ARG*     1.3    74.8    -      -       -      +
     95S  GLN*     1.3    61.7    +      -       -      +
     97S  ASN*     3.1     7.6    +      -       -      +
     98S  TYR*     2.6    37.4    +      -       -      +
     65Z  TRP*     4.1    17.4    -      -       +      -
----------------------------------------------------------
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Residues in contact with GLN 95 (chain S). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     91S  TYR*     3.1    54.4    +      -       +      +
     92S  LEU*     3.3     7.6    +      -       +      +
     94S  GLN*     1.3    82.4    +      -       -      +
     96S  CYS*     1.3    60.2    +      -       -      +
     98S  TYR*     3.5    15.4    +      -       -      +
     99S  SER*     3.2    22.5    +      -       -      -
    107S  LEU*     3.9    10.5    -      -       +      +
    111S  ARG*     5.3     2.8    +      -       -      -
    115S  LEU*     3.7    35.7    -      -       +      +
----------------------------------------------------------
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Residues in contact with CYS 96 (chain S). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     70S  CYS*     4.3     7.0    -      -       -      +
     71S  ASP*     3.4    39.6    -      -       +      +
     73S  HIS*     4.4     3.4    -      -       -      -
     74S  MET*     4.0    26.7    -      -       -      -
     92S  LEU*     2.9    22.5    +      -       -      +
     93S  ARG      3.7     4.7    -      -       -      +
     95S  GLN*     1.3    75.7    -      -       -      +
     97S  ASN*     1.3    65.8    +      -       -      +
     99S  SER*     3.2     6.1    +      -       -      -
    100S  SER*     3.1    23.2    +      -       -      -
    105S  ARG      4.8     0.2    -      -       -      +
    107S  LEU*     4.0    22.6    +      -       +      +
     64Z  LYS*     5.4     0.2    -      -       -      +
----------------------------------------------------------
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Residues in contact with ASN 97 (chain S). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     93S  ARG      3.0    18.9    +      -       -      +
     94S  GLN*     3.4     8.7    -      -       -      +
     96S  CYS*     1.3    78.0    -      -       -      +
     98S  TYR*     1.3    62.3    +      -       -      +
    100S  SER*     3.3     4.7    +      -       -      -
    101S  LEU*     3.0    39.6    +      -       +      +
     61Z  ASN*     2.8    44.7    -      -       -      +
     64Z  LYS*     3.2    24.7    -      -       -      +
     65Z  TRP*     2.9    21.0    +      -       +      +
----------------------------------------------------------
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Residues in contact with TYR 98 (chain S). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     821  TYR*     6.2     0.2    -      -       -      -
     94S  GLN      2.6    19.9    +      -       -      +
     95S  GLN*     3.7    20.4    -      -       -      +
     97S  ASN*     1.3    73.9    -      -       -      +
     99S  SER*     1.3    67.2    +      -       -      +
    101S  LEU*     4.9     4.5    -      -       -      -
    102S  VAL*     3.0    55.8    +      -       +      +
    103S  PHE*     4.0    21.7    -      +       -      -
----------------------------------------------------------
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Residues in contact with SER 99 (chain S). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     95S  GLN      3.2    10.2    +      -       -      -
     96S  CYS      3.2     9.1    +      -       -      -
     98S  TYR*     1.3    83.4    -      -       -      +
    100S  SER*     1.3    57.8    +      -       -      +
    103S  PHE*     3.0    32.7    +      -       -      +
    104S  ASN      3.2     4.2    +      -       -      -
    105S  ARG*     2.6    39.1    +      -       -      +
    107S  LEU*     3.8    27.4    +      -       -      +
    111S  ARG*     5.6     1.3    +      -       -      -
----------------------------------------------------------
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Residues in contact with SER 100 (chain S). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     811  GLU*     4.7     0.5    -      -       -      +
     71S  ASP*     4.1    12.0    +      -       -      -
     96S  CYS      3.1    12.1    +      -       -      -
     97S  ASN*     3.6    14.0    -      -       -      -
     98S  TYR      3.2     0.2    -      -       -      -
     99S  SER*     1.3    73.2    -      -       -      +
    101S  LEU*     1.3    63.5    +      -       -      +
    104S  ASN*     2.7    32.0    +      -       -      +
    105S  ARG      3.6    16.8    +      -       -      +
    106S  LYS*     4.6     7.3    -      -       -      +
     57Z  LYS*     5.4     0.2    -      -       -      -
     64Z  LYS*     4.9     3.8    +      -       -      -
----------------------------------------------------------
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Residues in contact with LEU 101 (chain S). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     811  GLU*     3.5     6.2    -      -       -      +
     851  THR*     4.1     1.8    +      -       -      -
     97S  ASN*     3.0    41.7    +      -       -      +
     98S  TYR*     4.1     3.4    -      -       -      +
    100S  SER*     1.3    80.0    -      -       -      +
    102S  VAL*     1.3    65.7    +      -       +      +
     57Z  LYS*     2.9    56.0    +      -       +      +
     61Z  ASN*     3.9    28.5    -      -       +      +
----------------------------------------------------------
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Residues in contact with VAL 102 (chain S). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     811  GLU*     3.0    30.5    -      -       -      +
     821  TYR*     3.3    15.6    +      -       +      -
     851  THR*     3.8    26.0    -      -       +      +
     891  GLN*     5.8     0.7    -      -       -      +
     98S  TYR*     3.0    48.4    +      -       +      +
    101S  LEU*     1.3    80.9    -      -       +      +
    103S  PHE*     1.3    87.0    +      -       +      +
----------------------------------------------------------
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Residues in contact with PHE 103 (chain S). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     621  LEU*     3.6    30.7    -      -       +      -
     741  LEU*     5.9     0.7    -      -       +      -
     781  TYR*     3.1    36.9    -      -       +      -
     811  GLU*     3.7     4.0    -      -       -      -
     821  TYR*     3.6    38.8    -      +       +      -
     98S  TYR*     4.0    19.1    -      +       -      -
     99S  SER*     3.0    23.4    +      -       -      +
    102S  VAL*     1.3    93.2    -      -       +      +
    104S  ASN*     1.3    72.4    +      -       -      +
    105S  ARG*     3.2    20.8    +      -       +      -
----------------------------------------------------------
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Residues in contact with ASN 104 (chain S). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     771  SER*     4.3    18.7    +      -       -      +
     781  TYR*     3.6    12.0    -      -       -      -
     811  GLU*     3.6    28.5    -      -       +      +
    100S  SER*     2.7    27.9    +      -       -      +
    102S  VAL      3.7     0.8    -      -       -      -
    103S  PHE*     1.3    75.0    -      -       -      +
    105S  ARG*     1.3    55.9    -      -       -      +
----------------------------------------------------------
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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