Contacts of the helix formed by residues 390 - 413 (chain E) in PDB entry 3IFS


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 ASN 390 (chain E).
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
      4E  HIS*     5.9     1.4    -      -       -      -
     95E  MSE      5.5     0.3    -      -       -      +
     96E  LEU*     3.5    13.4    -      -       -      +
    388E  GLU*     3.5    32.5    +      -       -      +
    389E  LEU*     1.3    75.6    -      -       -      +
    391E  GLU*     1.3    72.2    +      -       -      +
    392E  TYR*     3.5     9.6    +      -       -      +
    393E  THR*     2.7    33.7    +      -       -      -
    394E  PHE*     3.0    22.0    +      -       -      +
----------------------------------------------------------
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Residues in contact with GLU 391 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     96E  LEU*     3.8    14.5    -      -       +      +
    224E  GLY      4.7     0.5    -      -       -      +
    225E  LEU*     3.4    29.5    -      -       +      +
    226E  ASN*     2.8    56.4    +      -       -      +
    229E  GLU*     4.2     5.7    -      -       +      +
    230E  MSE      3.4    22.7    -      -       +      +
    390E  ASN*     1.3    81.8    -      -       -      +
    392E  TYR*     1.3    63.3    +      -       -      +
    394E  PHE*     3.2     2.9    +      -       -      +
    395E  GLY      3.0    19.2    +      -       -      -
----------------------------------------------------------
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Residues in contact with TYR 392 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
      4E  HIS*     3.6    40.5    -      +       -      +
    229E  GLU*     3.5    33.3    +      -       +      +
    232E  LYS*     3.9    14.4    -      -       +      -
    233E  GLY*     3.3    37.1    -      -       -      -
    236E  ALA*     3.2    21.6    -      -       +      +
    390E  ASN*     3.3    12.0    +      -       -      +
    391E  GLU*     1.3    78.9    -      -       -      +
    393E  THR*     1.3    65.5    +      -       -      +
    395E  GLY      3.3     0.2    +      -       -      -
    396E  TYR*     3.0    24.7    +      +       -      +
----------------------------------------------------------
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Residues in contact with THR 393 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
      4E  HIS*     2.8    32.8    +      -       -      +
      5E  VAL*     4.1    13.2    -      -       +      -
    386E  ILE*     3.5    22.9    -      -       +      -
    387E  PRO*     4.4     2.7    -      -       +      -
    388E  GLU*     3.3    26.0    +      -       -      +
    389E  LEU*     5.1     0.4    -      -       +      -
    390E  ASN*     2.7    26.5    +      -       -      -
    392E  TYR*     1.3    73.4    -      -       -      +
    394E  PHE*     1.3    61.1    +      -       -      +
    396E  TYR*     3.6     0.5    -      -       -      +
    397E  LEU*     2.8    31.1    +      -       +      +
----------------------------------------------------------
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Residues in contact with PHE 394 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     88E  GLY*     4.0    11.2    -      -       -      -
     91E  ALA*     4.2     2.9    -      -       +      -
     92E  ALA*     3.5    39.7    -      -       +      -
     95E  MSE      3.8    28.0    -      -       +      -
     96E  LEU*     4.1    11.2    -      -       +      -
    211E  VAL*     4.4    14.4    -      -       +      -
    212E  LEU*     4.9     1.6    -      -       +      -
    230E  MSE      3.7    27.6    -      -       +      -
    281E  PHE*     4.1    20.9    -      +       -      -
    284E  TRP*     6.2     1.3    -      +       -      -
    390E  ASN      3.0    14.4    +      -       -      +
    391E  GLU      3.6     6.7    -      -       -      +
    393E  THR*     1.3    77.4    -      -       -      +
    395E  GLY*     1.3    60.5    +      -       -      +
    397E  LEU*     3.7     5.4    -      -       -      +
    398E  VAL*     2.8    52.6    +      -       +      +
----------------------------------------------------------
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Residues in contact with GLY 395 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    212E  LEU*     4.9     2.2    -      -       -      -
    230E  MSE      3.6    29.6    -      -       -      -
    234E  ALA*     3.4    22.9    -      -       -      +
    391E  GLU      3.0    10.7    +      -       -      -
    392E  TYR      3.8     0.4    -      -       -      -
    394E  PHE*     1.3    81.6    -      -       -      +
    396E  TYR*     1.3    60.6    +      -       -      +
    398E  VAL*     3.5     5.3    +      -       -      +
    399E  TYR      3.2    16.8    +      -       -      -
----------------------------------------------------------
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Residues in contact with TYR 396 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
      3E  THR*     3.1    20.1    -      -       -      +
      4E  HIS*     3.3    24.7    +      +       +      -
      5E  VAL*     3.3    37.5    -      -       +      -
    233E  GLY*     3.4    25.7    -      -       -      +
    234E  ALA*     4.3     1.3    -      -       -      +
    236E  ALA*     3.7    11.9    -      -       +      -
    237E  GLY*     3.5    14.3    -      -       -      -
    240E  ASP*     2.5    34.9    +      -       -      +
    241E  PHE*     3.4    26.9    -      +       -      -
    392E  TYR*     3.0    20.0    +      +       +      +
    393E  THR*     3.6     7.4    -      -       -      +
    395E  GLY*     1.3    75.8    -      -       -      +
    397E  LEU*     1.3    57.8    +      -       -      +
    399E  TYR*     3.2     5.0    +      -       -      +
    400E  PHE*     3.0    24.4    +      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 397 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
      5E  VAL*     4.0    19.7    -      -       +      -
     95E  MSE      4.7    12.6    -      -       +      -
    281E  PHE*     3.7    34.5    -      -       +      -
    330E  LEU*     5.1     1.3    -      -       +      -
    384E  VAL*     3.9    22.2    -      -       +      -
    386E  ILE*     3.6    29.4    -      -       +      -
    393E  THR*     2.8    18.4    +      -       +      +
    394E  PHE*     3.7     4.7    -      -       -      +
    396E  TYR*     1.3    73.1    -      -       -      +
    398E  VAL*     1.3    66.3    +      -       -      +
    400E  PHE*     3.3     8.2    +      -       +      +
    401E  PHE*     3.2    46.3    +      -       +      -
----------------------------------------------------------
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Residues in contact with VAL 398 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    211E  VAL*     3.8    16.6    -      -       +      -
    212E  LEU*     4.2    12.3    -      -       +      -
    281E  PHE*     4.2     7.0    -      -       +      -
    284E  TRP*     3.7    24.5    -      -       +      -
    394E  PHE*     2.8    55.4    +      -       +      +
    395E  GLY*     3.8     5.8    -      -       -      +
    397E  LEU*     1.3    78.8    -      -       -      +
    399E  TYR*     1.3    57.6    +      -       -      +
    401E  PHE      3.4     0.5    +      -       -      -
    402E  GLU*     2.9    52.8    +      -       -      +
----------------------------------------------------------
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Residues in contact with TYR 399 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     36E  HIS*     5.6     0.5    -      -       -      -
     48E  TRP*     3.7    19.7    -      +       -      -
     49E  VAL*     2.5    46.4    +      -       -      +
     52E  PRO*     3.9    22.0    -      -       +      -
    212E  LEU*     5.3     2.0    -      -       +      -
    234E  ALA*     3.9    14.6    -      -       +      +
    237E  GLY*     3.6    20.2    -      -       -      -
    238E  ARG*     3.4    24.3    +      -       +      +
    241E  PHE*     4.3     5.2    -      +       +      -
    395E  GLY      3.2    17.2    +      -       -      +
    396E  TYR      3.2     4.4    +      -       -      +
    398E  VAL*     1.3    74.6    -      -       +      +
    400E  PHE*     1.3    67.4    +      -       -      +
    402E  GLU*     4.1    12.8    -      -       -      -
    403E  LYS*     2.9    49.0    +      -       +      +
----------------------------------------------------------
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Residues in contact with PHE 400 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
      5E  VAL*     4.9     9.9    -      -       +      -
      7E  PHE*     4.2    15.7    -      +       +      -
    241E  PHE*     3.6    36.3    -      +       +      -
    250E  PRO*     3.7    14.6    -      -       +      -
    251E  ALA*     3.6    27.0    -      -       -      +
    254E  TYR*     4.1    26.7    -      +       +      -
    384E  VAL*     4.1    16.4    -      -       +      -
    396E  TYR*     3.0    14.5    +      -       +      +
    397E  LEU*     3.4    16.8    -      -       +      +
    399E  TYR*     1.3    77.0    -      -       -      +
    401E  PHE*     1.3    96.5    +      +       -      +
    404E  ALA*     2.9    30.3    +      -       -      +
----------------------------------------------------------
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Residues in contact with PHE 401 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    254E  TYR*     3.6    33.7    -      +       -      -
    271E  LEU*     4.4     5.2    -      -       +      -
    281E  PHE*     3.8    31.9    -      +       -      -
    284E  TRP*     3.9     7.6    -      +       +      -
    285E  TRP*     3.6    28.5    -      +       -      -
    288E  LEU*     3.6    17.7    -      -       +      +
    289E  PHE*     3.9     4.9    -      +       -      -
    330E  LEU*     4.0    20.6    -      -       +      -
    384E  VAL*     4.2     6.7    -      -       +      -
    397E  LEU*     3.2    39.1    +      -       +      +
    400E  PHE*     1.3    93.6    -      +       -      +
    402E  GLU*     1.3    60.8    +      -       -      +
    404E  ALA*     3.8     1.6    -      -       -      +
    405E  CYS*     2.8    32.4    +      -       -      +
----------------------------------------------------------
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Residues in contact with GLU 402 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     48E  TRP*     3.6    35.1    -      -       +      +
    209E  PHE*     3.6    51.0    -      -       +      +
    211E  VAL*     4.2     4.2    -      -       -      +
    212E  LEU*     4.9     5.5    -      -       -      +
    284E  TRP*     4.1    15.1    -      -       +      -
    288E  LEU*     4.1     5.4    -      -       +      -
    398E  VAL*     2.9    41.6    +      -       +      +
    399E  TYR*     3.8    15.6    -      -       -      +
    401E  PHE*     1.3    75.4    -      -       -      +
    403E  LYS*     1.3    62.4    +      -       -      +
    405E  CYS*     3.6     2.4    -      -       -      +
    406E  ALA      3.1    18.4    +      -       -      -
----------------------------------------------------------
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Residues in contact with LYS 403 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     35E  ILE*     4.0    20.4    -      -       +      -
     36E  HIS*     2.9    35.4    +      -       -      -
     48E  TRP*     4.0    19.7    -      -       +      -
     49E  VAL*     4.7     1.6    -      -       -      -
    241E  PHE*     2.7    38.6    +      -       +      +
    242E  GLY*     3.7     2.8    -      -       -      -
    251E  ALA*     4.3     7.4    -      -       +      -
    252E  TYR*     3.0    26.9    +      -       +      -
    399E  TYR*     2.9    39.4    +      -       +      +
    400E  PHE      4.0     2.0    -      -       -      +
    402E  GLU*     1.3    73.8    -      -       -      +
    404E  ALA*     1.3    65.8    +      -       -      +
    406E  ALA*     3.3     3.6    +      -       -      +
    407E  MSE      3.1    22.7    +      -       -      +
----------------------------------------------------------
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Residues in contact with ALA 404 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    251E  ALA*     3.3    31.7    -      -       +      +
    254E  TYR*     3.7    28.0    -      -       +      -
    255E  ALA*     3.4     5.9    -      -       -      +
    289E  PHE*     4.5     2.0    -      -       +      -
    400E  PHE*     2.9    20.5    +      -       +      +
    401E  PHE*     3.8     5.4    -      -       -      +
    403E  LYS*     1.3    75.7    -      -       -      +
    405E  CYS*     1.3    57.6    +      -       -      +
    407E  MSE      3.4     1.5    +      -       -      -
    408E  SER*     2.8    31.9    +      -       -      -
----------------------------------------------------------
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Residues in contact with CYS 405 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    209E  PHE*     4.6     3.6    -      -       +      -
    288E  LEU*     3.4    29.2    -      -       +      -
    289E  PHE*     3.7    26.2    -      -       +      -
    292E  SER*     3.3    38.1    -      -       -      -
    293E  GLU*     4.5     1.7    -      -       -      +
    401E  PHE      2.8    18.3    +      -       -      +
    402E  GLU      3.6     4.9    -      -       -      +
    404E  ALA*     1.3    74.7    -      -       -      +
    406E  ALA*     1.3    64.9    +      -       -      +
    408E  SER*     3.3     0.9    +      -       -      -
    409E  GLY*     3.0    22.3    +      -       -      -
    416E  PRO*     4.6     1.8    -      -       -      +
----------------------------------------------------------
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Residues in contact with ALA 406 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     35E  ILE*     4.0    16.8    -      -       +      -
     48E  TRP*     3.8    20.9    -      -       +      -
    209E  PHE*     5.2     0.8    -      -       -      -
    402E  GLU      3.1     6.3    +      -       -      -
    403E  LYS*     3.3     8.9    +      -       +      +
    405E  CYS*     1.3    76.2    -      -       -      +
    407E  MSE      1.3    62.7    +      -       -      +
    410E  TYR*     3.2    30.8    +      -       +      -
    416E  PRO*     3.9     5.4    -      -       -      +
    417E  PHE*     3.7    30.7    -      -       +      -
----------------------------------------------------------
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Residues in contact with MSE 407 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     28E  VAL*     3.6    31.0    -      -       +      +
     31E  THR*     3.5    25.1    -      -       +      -
     32E  HIS*     3.8    12.8    -      -       -      +
     35E  ILE*     4.3     6.2    -      -       +      +
    252E  TYR*     3.6    50.5    -      -       +      +
    255E  ALA*     3.5    18.8    -      -       +      -
    403E  LYS      3.1    10.6    +      -       -      +
    404E  ALA      3.7     6.3    -      -       -      +
    406E  ALA*     1.3    79.9    -      -       -      +
    408E  SER*     1.3    63.6    +      -       -      +
    410E  TYR*     3.4     1.4    +      -       -      -
    411E  LEU*     2.9    48.0    +      -       +      +
----------------------------------------------------------
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Residues in contact with SER 408 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    255E  ALA*     3.5    13.8    -      -       -      +
    258E  ARG*     2.8    21.5    +      -       -      -
    259E  ASN*     3.2    28.6    +      -       -      +
    289E  PHE*     4.5     2.0    -      -       -      -
    293E  GLU*     2.4    24.5    +      -       -      -
    404E  ALA      2.8    21.3    +      -       -      -
    405E  CYS*     3.3     6.7    +      -       -      -
    407E  MSE      1.3    73.2    -      -       -      +
    409E  GLY*     1.3    55.7    +      -       -      +
    411E  LEU*     3.2     1.8    +      -       -      -
    412E  LEU*     2.8    27.4    +      -       -      +
----------------------------------------------------------
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Residues in contact with GLY 409 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    293E  GLU*     3.2    13.8    +      -       -      -
    405E  CYS      3.0    15.0    +      -       -      -
    406E  ALA      4.0     1.1    -      -       -      -
    408E  SER*     1.3    76.2    -      -       -      +
    410E  TYR*     1.3    62.7    +      -       -      +
    412E  LEU*     3.2     3.3    +      -       -      +
    413E  GLY      3.0    17.5    +      -       -      -
    414E  VAL*     3.1    32.4    +      -       -      +
    416E  PRO*     4.2     9.6    -      -       -      -
----------------------------------------------------------
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Residues in contact with TYR 410 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     31E  THR*     3.4    34.8    +      -       +      +
     34E  ALA*     5.0     6.1    +      -       +      -
     35E  ILE*     3.6    27.6    -      -       +      -
     40E  GLY*     3.6    15.8    +      -       -      -
     41E  ALA*     2.5    44.3    +      -       +      -
     43E  ASN      4.7     1.6    +      -       -      -
     46E  LEU*     4.7     7.2    -      -       +      +
    406E  ALA      3.2    21.7    +      -       -      +
    407E  MSE      3.9     0.4    -      -       -      +
    409E  GLY*     1.3    74.8    -      -       -      +
    411E  LEU*     1.3    63.8    +      -       -      +
    413E  GLY*     3.2    13.0    +      -       -      -
    414E  VAL      4.0     6.1    -      -       -      -
    416E  PRO*     3.6    15.4    -      -       +      +
    417E  PHE*     3.4    23.7    -      +       -      -
----------------------------------------------------------
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Residues in contact with LEU 411 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     24E  LEU*     4.6    12.6    -      -       +      -
     27E  ALA*     4.4    22.7    -      -       +      +
     28E  VAL*     4.6     3.6    -      -       +      -
     31E  THR*     4.2    11.2    -      -       -      +
    255E  ALA      4.2     4.3    -      -       -      -
    256E  VAL*     3.8    39.9    -      -       +      +
    259E  ASN*     3.7    14.8    -      -       +      +
    407E  MSE      2.9    51.6    +      -       +      +
    408E  SER      3.6     4.3    -      -       -      +
    410E  TYR*     1.3    75.9    -      -       -      +
    412E  LEU*     1.3    61.0    +      -       -      +
    413E  GLY*     3.4     1.0    +      -       -      -
----------------------------------------------------------
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Residues in contact with LEU 412 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    259E  ASN*     3.7    15.7    +      -       -      +
    262E  TYR*     3.9    29.6    -      -       +      -
    293E  GLU*     3.8    41.7    -      -       +      +
    298E  LYS*     4.2    21.6    +      -       +      +
    299E  GLY*     4.1    13.7    -      -       -      +
    300E  ILE      5.4     0.4    -      -       -      +
    408E  SER      2.8    12.8    +      -       -      +
    409E  GLY      3.2     9.4    +      -       -      +
    411E  LEU*     1.3    76.9    -      -       -      +
    413E  GLY*     1.3    59.2    +      -       -      +
    414E  VAL*     3.9    16.8    -      -       +      +
----------------------------------------------------------
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Residues in contact with GLY 413 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    296E  ASP*     4.9     2.3    -      -       -      +
    298E  LYS*     4.2    10.8    +      -       -      -
    409E  GLY      3.0     3.4    +      -       -      -
    410E  TYR      3.2    10.2    +      -       -      -
    411E  LEU      3.2     4.5    -      -       -      -
    412E  LEU*     1.3    80.5    -      -       -      +
    414E  VAL*     1.3    63.1    +      -       -      +
----------------------------------------------------------
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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