Contacts of the helix formed by residues 70 - 91 (chain p) in PDB entry 3J9X


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 GLY 70 (chain p).
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    1067    T      3.5    24.8    +      -       -      +
    1077    A      4.4     2.4    +      -       -      -
    111m  PHE*     3.5    19.0    -      -       -      -
     90n  ILE*     5.6     0.8    -      -       -      +
     99n  MET*     5.3     0.2    -      -       -      +
     69p  THR*     1.3    75.5    -      -       -      +
     71p  PRO*     1.3    66.9    -      -       -      +
     73p  ARG*     2.9    36.0    +      -       -      +
----------------------------------------------------------
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Residues in contact with PRO 71 (chain p). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    1067    T      3.6    23.1    -      -       +      +
    1077    A      3.9    33.2    -      -       -      +
     71m  PRO*     3.6    19.0    -      -       +      +
     74m  ALA*     4.8     3.1    -      -       +      -
     75m  ILE*     3.5    37.2    -      -       +      +
    107m  TYR*     6.5     0.7    -      -       +      -
    111m  PHE*     4.6     7.2    -      -       +      -
     69p  THR      4.4     0.2    -      -       -      +
     70p  GLY*     1.3    83.0    -      -       -      +
     72p  ASN*     1.3    64.1    +      -       -      +
     73p  ARG      3.1     0.7    -      -       -      -
     74p  ALA*     3.1     4.7    +      -       -      +
     75p  ILE*     3.0    24.8    +      -       -      +
----------------------------------------------------------
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Residues in contact with ASN 72 (chain p). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     72m  ASN*     3.1    24.3    -      -       -      +
     75m  ILE*     3.5    12.5    -      -       -      +
    111m  PHE      3.3    24.9    +      -       -      -
    112m  ASN*     4.8     8.3    +      -       -      +
     68p  ILE*     3.5    16.2    -      -       +      -
     69p  THR      3.3    14.7    +      -       -      +
     70p  GLY      3.0     0.8    -      -       -      -
     71p  PRO*     1.3    75.2    -      -       -      +
     73p  ARG*     1.3    66.2    +      -       -      +
     75p  ILE*     3.3    19.0    +      -       +      +
     76p  TYR*     3.0    25.4    -      -       +      -
----------------------------------------------------------
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Residues in contact with ARG 73 (chain p). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    1067    T      3.0    35.8    +      -       -      +
     89n  ARG      4.6     0.8    +      -       -      -
     90n  ILE*     3.7    27.0    +      -       -      +
     60p  SER*     2.7    46.3    +      -       -      +
     63p  LEU*     3.5    16.8    -      -       +      +
     64p  THR*     2.9    31.5    +      -       -      +
     68p  ILE*     2.7    56.1    +      -       +      +
     69p  THR*     3.8     7.6    -      -       -      +
     70p  GLY      2.9    15.2    +      -       -      +
     72p  ASN*     1.3    76.3    -      -       -      +
     74p  ALA*     1.3    59.2    +      -       -      +
     76p  TYR*     3.0     5.5    +      -       -      -
     77p  GLN*     2.8    29.6    +      -       -      +
----------------------------------------------------------
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Residues in contact with ALA 74 (chain p). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    1057    A      4.1    16.9    -      -       +      +
    1067    T      3.0    41.2    +      -       +      +
    2438    A      4.7     5.2    -      -       +      -
    2448    T      4.4     5.7    -      -       -      +
     71m  PRO*     4.8     3.4    -      -       +      -
     70p  GLY      3.6     0.6    +      -       -      -
     71p  PRO      3.1     8.6    +      -       -      +
     73p  ARG*     1.3    77.9    -      -       -      +
     75p  ILE*     1.3    64.1    +      -       -      +
     77p  GLN*     3.6    10.1    -      -       -      +
     78p  GLY*     2.9    22.2    +      -       -      -
----------------------------------------------------------
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Residues in contact with ILE 75 (chain p). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    2448    T      5.8     0.2    -      -       -      -
     71m  PRO*     3.6    26.9    -      -       +      +
     72m  ASN*     3.5    36.1    -      -       -      +
     71p  PRO      3.0    14.8    +      -       -      +
     72p  ASN*     3.4    22.4    -      -       -      +
     73p  ARG      3.2     0.4    -      -       -      -
     74p  ALA*     1.3    76.3    -      -       -      +
     76p  TYR*     1.3    67.6    +      -       +      +
     78p  GLY*     3.4     0.7    +      -       -      -
     79p  PHE*     3.1    21.5    +      -       -      +
    107p  TYR*     3.5    31.5    -      -       +      -
    111p  PHE*     4.6    11.4    -      -       +      +
    112p  ASN      5.9     0.4    -      -       -      +
    113p  ALA*     4.1    19.7    -      -       +      -
----------------------------------------------------------
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Residues in contact with TYR 76 (chain p). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     59p  VAL*     4.4     3.2    -      -       -      +
     63p  LEU*     3.6    29.4    -      -       +      -
     68p  ILE*     4.0    18.5    -      -       +      +
     72p  ASN*     3.0    28.0    -      -       +      -
     73p  ARG      3.0     5.2    +      -       -      +
     75p  ILE*     1.3    83.0    -      -       +      +
     77p  GLN*     1.3    59.9    +      -       -      +
     79p  PHE*     3.3     6.2    +      -       -      +
     80p  GLY*     2.8    27.0    +      -       -      -
    112p  ASN      5.0     0.3    +      -       -      -
    113p  ALA*     4.0     8.9    -      -       +      -
    114p  ASN*     2.9    38.8    +      -       -      +
    117p  VAL*     3.7    30.7    -      -       +      +
    118p  LEU*     3.7    30.3    -      -       +      -
    121p  VAL*     4.2    11.7    -      -       +      +
----------------------------------------------------------
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Residues in contact with GLN 77 (chain p). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    1057    A      3.4    33.7    +      -       +      +
    1067    T      3.1    21.3    +      -       -      +
     55p  VAL*     5.4     0.7    -      -       -      +
     56p  ASN*     3.4    23.9    +      -       -      +
     59p  VAL*     3.3    20.9    -      -       -      +
     60p  SER*     3.5    26.7    -      -       -      +
     63p  LEU*     4.0     2.1    -      -       +      +
     73p  ARG      2.8    22.1    +      -       -      +
     74p  ALA*     3.6     9.0    -      -       -      +
     76p  TYR*     1.3    77.8    -      -       -      +
     78p  GLY*     1.3    56.6    +      -       -      +
     80p  GLY*     3.3     0.7    +      -       -      -
     81p  LEU*     2.9    41.7    +      -       +      +
----------------------------------------------------------
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Residues in contact with GLY 78 (chain p). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    1057    A      5.4     1.2    +      -       -      -
    2448    T      5.1     3.6    -      -       -      -
    2458    A      4.1    24.3    -      -       -      +
     74p  ALA      2.9    15.4    +      -       -      -
     75p  ILE      3.8     1.8    -      -       -      -
     76p  TYR      3.3     0.2    -      -       -      -
     77p  GLN*     1.3    77.0    -      -       -      +
     79p  PHE*     1.3    61.8    +      -       -      +
     81p  LEU*     3.8     5.3    -      -       -      +
     82p  LYS*     3.0    24.9    +      -       -      +
    107p  TYR*     3.5    13.3    +      -       -      -
----------------------------------------------------------
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Residues in contact with PHE 79 (chain p). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     75p  ILE      3.1    13.1    +      -       -      +
     76p  TYR      3.5     7.9    -      -       -      +
     78p  GLY*     1.3    76.3    -      -       -      +
     80p  GLY*     1.3    63.1    -      -       -      +
     82p  LYS*     3.1     5.3    +      -       -      +
     83p  VAL*     2.9    34.0    +      -       +      +
    100p  ILE*     5.1     1.8    -      -       +      -
    103p  LEU*     3.7    24.2    -      -       +      -
    104p  LYS*     3.8    23.1    -      -       +      -
    107p  TYR*     3.5    34.5    +      +       +      -
    118p  LEU*     3.3    52.9    -      -       +      -
    121p  VAL*     3.8    16.8    -      -       +      -
    122p  VAL*     3.7    23.8    -      -       +      -
----------------------------------------------------------
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Residues in contact with GLY 80 (chain p). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     55p  VAL*     4.5     6.3    -      -       -      -
     59p  VAL*     5.0     2.0    -      -       -      -
     76p  TYR      2.8    17.3    +      -       -      -
     77p  GLN*     3.8     0.9    -      -       -      -
     79p  PHE*     1.3    73.6    -      -       -      +
     81p  LEU*     1.3    63.1    +      -       -      +
     83p  VAL*     3.1     2.5    +      -       -      -
     84p  ALA*     3.0    19.9    +      -       -      +
    121p  VAL*     3.5    26.9    -      -       -      -
    125p  ILE*     3.1    17.4    -      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 81 (chain p). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    1047    T      5.5     1.6    -      -       -      +
    1057    A      5.6     3.6    -      -       -      +
    2458    A      4.1    19.7    -      -       +      +
    2468    T      3.4    36.6    -      -       -      +
     52p  PHE*     3.5    42.8    -      -       +      +
     55p  VAL*     4.5     6.5    -      -       +      +
     56p  ASN*     3.4    31.4    -      -       -      +
     77p  GLN*     2.9    29.2    +      -       +      +
     78p  GLY*     3.8     4.5    -      -       -      +
     80p  GLY*     1.3    74.5    -      -       -      +
     82p  LYS*     1.3    57.5    +      -       -      +
     84p  ALA*     3.2     3.6    +      -       -      -
     85p  ARG      2.9    23.7    +      -       -      -
----------------------------------------------------------
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Residues in contact with LYS 82 (chain p). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     957    A      4.9     0.2    +      -       -      -
     967    T      3.2    13.9    +      -       -      -
    2458    A      3.7    26.4    +      -       -      +
    2468    T      3.3    29.1    +      -       -      +
    106o  TYR*     2.8    33.8    +      -       -      -
     78p  GLY      3.0    17.5    +      -       -      +
     79p  PHE*     3.1     5.4    +      -       -      +
     81p  LEU*     1.3    74.5    -      -       -      +
     83p  VAL*     1.3    63.9    +      -       -      +
     85p  ARG*     3.3    10.3    +      -       -      +
     86p  ALA*     3.1    22.3    +      -       -      +
     99p  MET*     5.9     2.9    -      -       -      -
    103p  LEU*     3.5    34.9    -      -       +      +
    106p  TYR*     5.0     6.3    -      -       -      -
    107p  TYR*     4.6     4.0    -      -       +      -
----------------------------------------------------------
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Residues in contact with VAL 83 (chain p). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     79p  PHE*     2.9    42.6    +      -       +      +
     80p  GLY*     3.1     8.9    +      -       -      +
     82p  LYS*     1.3    76.4    -      -       -      +
     84p  ALA*     1.3    61.3    +      -       -      +
     86p  ALA*     3.3     8.1    +      -       -      +
     87p  LEU*     3.0    20.3    +      -       +      +
     96p  LEU*     4.5     2.9    -      -       +      +
     99p  MET*     6.5     0.2    -      -       -      -
    100p  ILE*     4.3    26.7    -      -       +      -
    103p  LEU*     3.7    18.6    -      -       +      -
    122p  VAL*     4.6     8.5    -      -       +      -
    125p  ILE*     3.8    26.7    -      -       +      -
    126p  THR*     4.5     6.1    -      -       +      -
----------------------------------------------------------
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Residues in contact with ALA 84 (chain p). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     51p  LYS      5.7     0.2    -      -       -      +
     52p  PHE*     3.6    20.0    -      -       +      -
     55p  VAL*     4.2    20.2    -      -       +      -
     80p  GLY      3.0    11.4    +      -       -      +
     81p  LEU*     3.5     8.3    -      -       -      +
     83p  VAL*     1.3    73.2    -      -       -      +
     85p  ARG*     1.3    66.8    +      -       -      +
     87p  LEU*     3.1    11.9    +      -       +      +
     88p  ASN*     3.0    25.2    +      -       -      +
    125p  ILE*     4.4    11.2    -      -       +      +
----------------------------------------------------------
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Residues in contact with ARG 85 (chain p). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     957    A      3.8    36.1    +      -       -      -
     967    T      2.9    33.7    +      -       -      +
    2468    T      3.0    36.1    +      -       -      +
    2478    A      3.4    29.9    +      -       -      +
     52p  PHE*     3.5    11.1    -      -       -      -
     81p  LEU      2.9    13.3    +      -       -      +
     82p  LYS*     3.3    21.2    -      -       -      +
     83p  VAL      3.2     0.4    -      -       -      -
     84p  ALA*     1.3    75.3    -      -       -      +
     86p  ALA*     1.3    63.7    +      -       -      +
     88p  ASN*     3.0     6.6    +      -       -      +
     89p  ARG*     3.0    44.7    +      -       -      +
----------------------------------------------------------
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Residues in contact with ALA 86 (chain p). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     957    A      5.6     2.7    -      -       -      -
     82p  LYS*     3.1     8.7    +      -       +      +
     83p  VAL*     3.3    10.1    +      -       -      +
     85p  ARG*     1.3    77.8    -      -       -      +
     87p  LEU*     1.3    59.0    +      -       -      +
     89p  ARG*     4.5     2.9    -      -       -      +
     90p  ILE*     2.7    46.9    +      -       +      +
     96p  LEU*     3.8    17.5    -      -       +      -
     99p  MET*     3.8    27.6    -      -       +      -
    100p  ILE*     6.0     0.2    -      -       +      -
----------------------------------------------------------
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Residues in contact with LEU 87 (chain p). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     83p  VAL*     3.0    14.3    +      -       +      +
     84p  ALA*     3.1    12.8    +      -       +      +
     86p  ALA*     1.3    76.3    -      -       -      +
     88p  ASN*     1.3    64.4    +      -       -      +
     91p  GLY*     2.7    30.7    +      -       -      +
     92p  SER*     3.6    29.8    -      -       -      +
     96p  LEU*     3.6    24.3    -      -       +      +
    125p  ILE*     4.5    25.4    -      -       +      +
    126p  THR*     6.0     2.2    -      -       +      -
----------------------------------------------------------
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Residues in contact with ASN 88 (chain p). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    2478    A      5.4     1.7    +      -       -      +
     48p  ASN*     4.9     5.6    +      -       -      +
     51p  LYS*     3.8    31.5    +      -       -      +
     52p  PHE*     3.4    33.5    -      -       -      -
     84p  ALA*     3.0    13.0    +      -       -      +
     85p  ARG*     3.0     7.6    +      -       -      +
     87p  LEU*     1.3    87.2    -      -       -      +
     89p  ARG*     1.3    63.7    +      -       +      +
     90p  ILE      4.8     0.2    -      -       -      -
     91p  GLY*     4.5     1.4    +      -       -      -
      7q  SER*     4.6    12.4    -      -       -      +
----------------------------------------------------------
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Residues in contact with ARG 89 (chain p). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     937    A      4.6     9.9    +      -       -      -
     947    T      3.6    28.8    +      -       -      +
     957    A      3.3    32.9    +      -       -      +
    2478    A      4.1    17.9    +      -       -      +
    2488    T      4.3    15.6    +      -       -      -
     85p  ARG*     3.0    46.0    +      -       -      +
     86p  ALA*     4.3     2.5    -      -       -      +
     88p  ASN*     1.3    80.5    -      -       +      +
     90p  ILE*     1.3    62.1    +      -       +      +
      7q  SER*     4.1    32.7    -      -       -      +
      8q  ARG*     6.2     0.2    -      -       -      +
     60r  SER*     4.5     5.9    +      -       -      -
     73r  ARG*     4.6     1.7    +      -       -      -
----------------------------------------------------------
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Residues in contact with ILE 90 (chain p). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     947    T      5.6     0.2    -      -       -      +
     957    A      4.5    11.2    -      -       -      +
     86p  ALA*     2.7    28.8    +      -       +      +
     88p  ASN      4.8     1.1    -      -       -      -
     89p  ARG*     1.3    77.6    -      -       -      +
     91p  GLY*     1.3    67.6    +      -       -      +
     95p  ALA*     3.6    26.2    -      -       +      +
     96p  LEU*     4.0     6.3    -      -       +      +
     99p  MET*     3.8    38.1    -      -       +      -
     60r  SER*     4.9     2.1    +      -       -      +
     61r  ALA*     5.8     0.7    -      -       -      -
     64r  THR*     2.6    36.5    +      -       -      +
     69r  THR*     4.4    11.0    -      -       +      -
     73r  ARG*     3.7    19.4    +      -       -      +
----------------------------------------------------------
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Residues in contact with GLY 91 (chain p). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     86p  ALA      3.6     0.6    +      -       -      -
     87p  LEU*     2.7    30.4    +      -       -      -
     88p  ASN      4.5     1.1    -      -       -      -
     90p  ILE*     1.3    89.3    -      -       -      +
     92p  SER*     1.3    69.0    +      -       -      +
     96p  LEU*     3.4     9.2    -      -       -      +
     64r  THR*     3.6     1.8    -      -       -      +
----------------------------------------------------------
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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