Contacts of the helix formed by residues 134 - 157 (chain E) in PDB entry 5XRZ


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 SER 134 (chain E).
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    103E  PHE*     3.7     1.8    -      -       -      -
    132E  LEU*     3.6     2.0    -      -       -      +
    133E  ALA*     1.3    77.8    -      -       -      +
    135E  LYS*     1.3    64.6    +      -       -      +
    136E  ALA*     3.8     2.9    +      -       -      +
    137E  LEU*     3.7    34.2    +      -       -      +
    138E  SER*     3.1    24.1    +      -       -      -
    130F  GLU*     3.2    31.0    +      -       -      -
----------------------------------------------------------
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Residues in contact with LYS 135 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     96E  VAL*     4.0    21.3    -      -       +      +
    103E  PHE*     3.3    48.8    -      -       +      -
    105E  VAL*     5.5     1.3    -      -       +      -
    134E  SER*     1.3    72.5    +      -       -      +
    136E  ALA*     1.3    58.3    +      -       -      +
    138E  SER*     3.2     4.2    +      -       -      -
    139E  LEU*     2.9    42.1    +      -       +      +
     95F  PHE*     3.5    37.2    -      -       +      +
     97F  ASP*     3.4    31.6    +      -       -      +
----------------------------------------------------------
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Residues in contact with ALA 136 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    134E  SER*     3.3     6.5    +      -       -      +
    135E  LYS*     1.3    78.5    -      -       -      +
    137E  LEU*     1.3    59.0    +      -       -      +
    139E  LEU      3.4     0.5    +      -       -      -
    140E  GLU*     2.9    30.9    +      -       -      +
     95F  PHE*     3.4    24.6    -      -       +      -
    105F  VAL      4.6     0.7    -      -       -      +
    106F  GLY*     4.4     2.9    -      -       -      -
    126F  TYR*     3.7    12.6    -      -       +      -
    128F  VAL*     3.6    37.2    -      -       +      -
    130F  GLU*     5.1     2.7    -      -       +      -
----------------------------------------------------------
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Residues in contact with LEU 137 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    132E  LEU*     3.8    34.1    -      -       +      +
    134E  SER*     3.4    28.6    +      -       -      +
    135E  LYS      3.3     0.4    -      -       -      -
    136E  ALA*     1.3    83.0    -      -       +      +
    138E  SER*     1.3    63.1    +      -       -      +
    140E  GLU*     3.4    16.3    +      -       -      +
    141E  LYS*     2.9    24.9    +      -       -      +
     58F  GLY*     5.8     4.7    -      -       -      +
    128F  VAL*     4.7     7.9    -      -       +      -
    130F  GLU*     4.1    13.0    -      -       -      +
----------------------------------------------------------
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Residues in contact with SER 138 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    103E  PHE*     3.7    17.3    +      -       -      +
    105E  VAL*     3.8    19.7    -      -       -      -
    129E  SER*     3.0    32.6    +      -       -      -
    132E  LEU*     3.4    13.6    -      -       -      +
    134E  SER      3.1    16.4    +      -       -      -
    135E  LYS      3.6     4.7    -      -       -      -
    137E  LEU*     1.3    77.0    -      -       -      +
    139E  LEU*     1.3    57.8    +      -       -      +
    142E  ALA*     2.9    30.9    +      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 139 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     93E  VAL*     4.5    16.6    -      -       +      -
     96E  VAL*     3.9    16.2    -      -       +      -
    105E  VAL*     3.6    26.0    -      -       +      -
    107E  VAL*     4.7     1.8    -      -       +      -
    135E  LYS*     2.9    23.2    +      -       +      +
    138E  SER*     1.3    73.9    -      -       -      +
    140E  GLU*     1.3    66.9    +      -       -      +
    142E  ALA*     4.4     2.2    -      -       -      +
    143E  ARG*     2.9    33.8    +      -       +      +
     94F  ASP*     3.8    12.1    -      -       +      +
     95F  PHE*     3.5    29.2    -      -       +      -
    126F  TYR*     3.2    31.0    -      -       +      +
----------------------------------------------------------
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Residues in contact with GLU 140 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    136E  ALA      2.9    15.9    +      -       -      +
    137E  LEU*     3.6    16.4    -      -       -      +
    139E  LEU*     1.3    75.7    -      -       -      +
    141E  LYS*     1.3    63.5    +      -       -      +
    143E  ARG*     4.1     0.8    -      -       -      +
    144E  LYS*     2.7    69.6    +      -       +      +
    301E    K      3.1    21.3    -      -       -      -
    126F  TYR*     3.7    27.7    -      -       +      +
    128F  VAL*     4.3    13.9    -      -       -      +
     19L    C      5.1     2.0    -      -       -      +
     20L    C      3.6    14.9    +      -       -      +
----------------------------------------------------------
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Residues in contact with LYS 141 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    128E  VAL      3.3    19.3    +      -       -      +
    129E  SER*     3.7    22.5    +      -       -      +
    130E  GLU      5.1     2.0    -      -       -      +
    131E  GLY      5.9     1.2    -      -       -      +
    132E  LEU*     4.6    10.4    -      -       +      +
    137E  LEU      2.9    18.1    +      -       -      +
    138E  SER      3.7     3.4    -      -       -      +
    140E  GLU*     1.3    77.8    -      -       -      +
    142E  ALA*     1.3    62.7    +      -       -      +
    144E  LYS*     4.2     1.9    -      -       -      +
    145E  GLU*     2.9    42.3    +      -       -      +
     17L    T      4.9     7.3    +      -       -      +
     18L    T      3.5    33.6    -      -       -      +
     19L    C      5.2     7.5    -      -       -      +
----------------------------------------------------------
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Residues in contact with ALA 142 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    105E  VAL*     3.8    14.8    -      -       +      +
    107E  VAL*     3.6    27.8    -      -       +      +
    127E  GLY*     3.2    28.5    -      -       -      +
    128E  VAL      4.0     2.7    -      -       -      +
    129E  SER*     4.6     2.4    -      -       -      +
    138E  SER      2.9    18.9    +      -       -      +
    139E  LEU      3.3     1.3    +      -       -      +
    141E  LYS*     1.3    76.8    -      -       -      +
    143E  ARG*     1.3    57.2    +      -       -      +
    146E  ALA*     2.9    27.2    +      -       -      +
----------------------------------------------------------
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Residues in contact with ARG 143 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     91E  GLN*     2.5    52.4    +      -       -      +
     93E  VAL*     3.8    23.8    -      -       -      +
    107E  VAL*     3.9    19.1    -      -       +      -
    139E  LEU*     2.9    24.2    +      -       +      +
    140E  GLU*     4.2     2.7    -      -       -      +
    142E  ALA*     1.3    75.8    -      -       -      +
    144E  LYS*     1.3    63.8    +      -       +      +
    146E  ALA*     3.2     3.1    +      -       -      +
    147E  VAL*     3.0    21.2    +      -       -      +
     92F  ASN*     5.0     5.5    -      -       -      +
     94F  ASP*     2.8    27.8    +      -       -      -
    108F  CYS*     2.8    40.9    -      -       -      -
    110F  PHE*     4.2     6.8    -      -       -      -
    124F  VAL*     4.6    11.4    -      -       +      -
    126F  TYR*     4.1    15.7    -      -       +      -
----------------------------------------------------------
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Residues in contact with LYS 144 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    140E  GLU*     2.7    50.5    +      -       +      +
    141E  LYS      4.2     0.2    -      -       -      +
    143E  ARG*     1.3    75.8    -      -       +      +
    145E  GLU*     1.3    63.2    +      -       -      +
    147E  VAL*     3.3     3.0    +      -       -      -
    148E  THR*     3.0    28.0    +      -       -      -
    123F  ASP*     5.2     0.7    -      -       -      -
    124F  VAL*     4.7     9.0    -      -       +      +
    125F  GLY*     4.2     2.5    -      -       -      -
    126F  TYR*     3.9    15.0    -      -       +      +
    149F  ASP*     2.6    24.5    +      -       -      -
    153F  ARG*     3.4    28.8    +      -       -      +
     19L    C      3.2    34.8    -      -       -      +
     20L    C      2.3    29.0    +      -       -      +
----------------------------------------------------------
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Residues in contact with GLU 145 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    301D    K      3.6    19.8    -      -       -      -
     55E  ARG*     5.8     0.5    +      -       -      -
    126E  TYR      3.7     8.7    -      -       -      +
    127E  GLY*     3.9     3.6    -      -       -      -
    128E  VAL*     3.5    35.9    +      -       -      +
    141E  LYS*     2.9    33.1    +      -       +      +
    144E  LYS*     1.3    76.6    -      -       -      +
    146E  ALA*     1.3    58.0    +      -       -      +
    148E  THR*     3.8     1.1    -      -       -      -
    149E  ASP*     2.9    34.8    +      -       +      +
     17L    T      4.6    13.0    +      -       -      +
     18L    T      3.7    36.9    -      -       -      +
     19L    C      4.3     1.4    -      -       -      -
----------------------------------------------------------
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Residues in contact with ALA 146 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    107E  VAL*     3.6    17.0    -      -       +      +
    108E  CYS      4.1     0.7    -      -       -      -
    109E  ALA*     4.0    15.0    -      -       +      +
    125E  GLY*     3.5    16.1    -      -       -      +
    126E  TYR      3.4    13.6    +      -       -      +
    127E  GLY      3.4    11.9    -      -       -      +
    142E  ALA      2.9    18.6    +      -       -      +
    143E  ARG      3.2     4.7    +      -       -      +
    145E  GLU*     1.3    77.4    -      -       -      +
    147E  VAL*     1.3    57.9    +      -       -      +
    150E  GLY*     2.9    25.3    +      -       -      -
----------------------------------------------------------
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Residues in contact with VAL 147 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     86E  HIS*     4.9     5.6    -      -       +      -
     88E  ILE*     3.6    21.5    -      -       +      -
     91E  GLN*     3.2    26.7    -      -       -      +
    109E  ALA*     3.9    10.8    -      -       +      -
    111E  VAL*     3.5     9.0    -      -       +      +
    143E  ARG      3.0    11.7    +      -       -      +
    144E  LYS      3.9     3.6    -      -       -      +
    146E  ALA*     1.3    75.1    -      -       -      +
    148E  THR*     1.3    59.7    +      -       -      +
    150E  GLY      3.3     1.2    +      -       -      -
    151E  LEU*     2.9    27.0    +      -       +      +
    122F  GLU      4.7     1.8    -      -       -      +
    123F  ASP*     3.4    35.2    -      -       -      +
    124F  VAL*     3.5    18.4    -      -       +      -
    153F  ARG*     4.5     0.4    -      -       -      +
----------------------------------------------------------
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Residues in contact with THR 148 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     68E  GLY*     4.4    23.1    -      -       -      -
     72E  ILE*     6.3     2.9    -      -       +      -
    144E  LYS      3.0    12.7    +      -       -      -
    145E  GLU      3.9     2.5    -      -       -      -
    147E  VAL*     1.3    78.8    -      -       -      +
    149E  ASP*     1.3    56.2    +      -       -      +
    151E  LEU*     3.2    12.1    +      -       +      +
    152E  LYS*     3.0    35.8    +      -       +      +
    123F  ASP*     5.0     0.4    +      -       -      -
    153F  ARG*     3.1     8.0    +      -       -      -
     18L    T      3.8    16.4    -      -       -      +
     19L    C      2.2    34.9    +      -       -      +
----------------------------------------------------------
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Residues in contact with ASP 149 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    140D  GLU*     5.4     0.4    -      -       -      -
    144D  LYS*     2.7    35.0    +      -       -      -
    301D    K      4.3     1.9    -      -       -      -
    125E  GLY*     3.6     3.1    -      -       -      -
    126E  TYR      3.7    15.5    -      -       -      +
    145E  GLU*     2.9    19.3    +      -       +      +
    146E  ALA      3.8     2.0    -      -       -      +
    148E  THR*     1.3    76.6    -      -       -      +
    150E  GLY*     1.3    59.0    +      -       -      +
    152E  LYS*     3.3    17.9    +      -       -      +
    153E  ARG*     2.9    33.7    +      -       -      +
     16L    T      3.4    16.0    -      -       -      +
     17L    T      3.4    15.4    +      -       -      -
----------------------------------------------------------
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Residues in contact with GLY 150 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    111E  VAL*     3.6    17.1    -      -       -      +
    123E  ASP      4.2     3.1    -      -       -      +
    124E  VAL      3.5    19.7    -      -       -      -
    125E  GLY*     3.3     8.4    -      -       -      -
    146E  ALA      2.9    12.1    +      -       -      -
    147E  VAL      3.7     3.1    -      -       -      -
    149E  ASP*     1.3    76.8    -      -       -      +
    151E  LEU*     1.3    56.1    +      -       -      +
    153E  ARG*     3.4     1.0    +      -       -      +
    154E  ALA*     2.9    32.1    +      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 151 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     72E  ILE*     4.4    23.3    -      -       +      -
     84E  TRP*     3.7    24.9    -      -       +      -
     86E  HIS*     3.4    41.5    -      -       +      +
    111E  VAL*     3.6     6.8    -      -       +      +
    113E  VAL*     3.6    22.0    -      -       +      -
    147E  VAL*     2.9    14.9    +      -       +      +
    148E  THR*     3.2    13.2    +      -       +      +
    150E  GLY*     1.3    75.8    -      -       -      +
    152E  LYS*     1.3    58.4    +      -       +      +
    154E  ALA*     3.3     1.4    +      -       -      -
    155E  LEU*     2.9    38.2    +      -       +      +
    123F  ASP*     5.6     2.0    -      -       -      +
    157F  SER*     4.7     2.0    -      -       -      +
----------------------------------------------------------
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Residues in contact with LYS 152 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     66E  ILE      3.6    18.4    +      -       -      +
     68E  GLY*     4.0    16.8    -      -       -      -
     71E  VAL*     4.2    23.2    -      -       +      +
    148E  THR*     3.0    19.0    +      -       +      +
    149E  ASP*     3.7    25.3    +      -       -      +
    151E  LEU*     1.3    78.2    -      -       +      +
    153E  ARG*     1.3    58.5    +      -       +      +
    155E  LEU*     3.2     6.5    +      -       -      +
    156E  ARG*     2.9    35.8    +      -       +      +
    162E  LEU      4.7     1.4    -      -       -      +
     17L    T      2.4    38.1    +      -       -      -
     18L    T      2.5    26.5    +      -       -      +
----------------------------------------------------------
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Residues in contact with ARG 153 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    144D  LYS*     3.7    38.6    +      -       -      +
    148D  THR*     3.1    25.1    +      -       -      +
    123E  ASP*     2.9    45.7    +      -       -      +
    124E  VAL      3.2    20.0    +      -       -      +
    149E  ASP*     2.9    20.9    +      -       -      +
    150E  GLY      3.9     0.4    -      -       -      +
    152E  LYS*     1.3    77.0    -      -       +      +
    154E  ALA*     1.3    61.8    +      -       -      +
    156E  ARG*     3.5    32.4    -      -       -      +
    157E  SER*     3.9     5.5    +      -       -      -
    167E  LEU*     5.6     0.2    -      -       -      +
     15L    T      2.6    26.4    +      -       -      -
     16L    T      3.2    32.0    +      -       -      +
----------------------------------------------------------
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Residues in contact with ALA 154 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     86D  HIS*     5.8     0.2    -      -       -      -
    111E  VAL      3.7    19.1    -      -       -      +
    113E  VAL*     3.6    25.5    -      -       +      +
    121E  HIS*     3.6    29.9    -      -       -      +
    123E  ASP*     3.9    11.6    -      -       -      +
    150E  GLY      2.9    18.6    +      -       -      +
    151E  LEU*     3.8     0.7    -      -       -      +
    153E  ARG*     1.3    77.2    -      -       -      +
    155E  LEU*     1.3    62.4    +      -       -      +
    156E  ARG      3.2     0.7    +      -       -      -
    157E  SER*     3.6    10.9    +      -       -      -
    158E  PHE*     4.6     1.4    -      -       -      -
----------------------------------------------------------
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Residues in contact with LEU 155 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     71E  VAL*     3.8    31.4    -      -       +      +
     72E  ILE*     5.2     1.1    -      -       +      +
     75E  ALA*     4.0    25.4    -      -       +      -
     79E  PHE*     4.5     2.5    -      -       +      -
     84E  TRP*     4.2    11.4    -      -       +      -
    113E  VAL*     3.8    29.6    -      -       +      -
    151E  LEU*     2.9    40.5    +      -       +      +
    152E  LYS*     3.2     4.0    +      -       -      +
    154E  ALA*     1.3    75.4    -      -       -      +
    156E  ARG*     1.3    65.9    +      -       -      +
    157E  SER      3.2     0.6    +      -       -      -
    158E  PHE*     3.3    27.5    +      -       +      +
    162E  LEU*     3.3    25.5    -      -       +      +
----------------------------------------------------------
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Residues in contact with ARG 156 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     72D  ILE*     5.5     3.8    -      -       +      -
     65E  TYR*     6.2     1.4    -      -       -      +
    152E  LYS*     2.9    22.7    +      -       +      +
    153E  ARG*     3.5    32.3    -      -       -      +
    154E  ALA      3.2     0.2    -      -       -      -
    155E  LEU*     1.3    77.8    -      -       -      +
    157E  SER*     1.3    57.7    +      -       -      +
    158E  PHE      2.8     8.0    +      -       -      -
    159E  GLY      3.3    17.5    +      -       -      +
    162E  LEU      3.8     7.8    +      -       -      +
    163E  GLY*     3.6    28.4    +      -       -      +
    164E  ASN*     3.4    17.7    -      -       -      +
    166E  ILE*     3.5    24.5    -      -       -      +
    167E  LEU*     3.4    27.5    -      -       -      +
     15L    T      3.8     4.2    +      -       -      -
     16L    T      2.3    45.1    +      -       -      -
     17L    T      5.1     2.6    +      -       -      -
----------------------------------------------------------
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Residues in contact with SER 157 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     72D  ILE*     3.9    23.3    -      -       -      +
     76D  ASN*     3.3    19.2    +      -       -      +
     84D  TRP*     3.4    12.8    -      -       -      -
     86D  HIS*     3.9    14.9    +      -       -      -
    151D  LEU*     4.8     1.7    -      -       -      +
    121E  HIS*     3.3    40.7    +      -       -      -
    123E  ASP*     4.7     3.5    +      -       -      -
    153E  ARG      3.9    10.6    +      -       -      -
    154E  ALA      3.6     3.1    +      -       -      -
    155E  LEU      3.2     1.6    -      -       -      -
    156E  ARG*     1.3    74.8    -      -       -      +
    158E  PHE*     1.3    55.5    +      -       -      +
    159E  GLY      3.6     0.7    -      -       -      -
----------------------------------------------------------
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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