Contacts of the helix formed by residues 587 - 615 (chain E) in PDB entry 6BAA


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 VAL 587 (chain E).
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    470E  LEU*     4.9     8.4    -      -       +      +
    547E  ASN*     4.9    15.7    -      -       +      +
    550E  ILE*     5.9     4.9    -      -       +      -
    551E  PRO*     3.9    30.1    -      -       +      -
    583E  PHE      3.4    18.8    -      -       -      +
    584E  HIS*     4.6     7.9    -      -       -      +
    585E  ILE      3.0     1.8    +      -       -      -
    586E  LEU*     1.3    78.5    -      -       -      +
    588E  THR*     1.3    66.1    +      -       -      +
    590E  LEU*     3.2    10.1    +      -       -      +
    591E  PHE*     3.0    29.1    +      -       +      +
----------------------------------------------------------
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Residues in contact with THR 588 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    444E  GLN*     6.1     0.4    -      -       -      +
    584E  HIS      4.9     3.6    +      -       -      -
    585E  ILE      3.9     8.1    +      -       -      -
    587E  VAL*     1.3    77.5    -      -       -      +
    589E  PRO*     1.4    62.7    -      -       +      +
    591E  PHE*     4.7     3.1    -      -       -      +
    592E  LEU*     2.8    54.1    +      -       +      +
   1293E  ASN*     5.7     2.9    +      -       -      -
   1297E  TRP*     4.9    16.1    -      -       +      -
   2001E  GBM      3.7    21.5    -      -       +      -
----------------------------------------------------------
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Residues in contact with PRO 589 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    441E  MET*     3.5    21.5    -      -       +      +
    444E  GLN*     3.5    25.1    -      -       +      +
    445E  ILE*     4.3    18.8    -      -       +      -
    585E  ILE*     3.4    17.5    -      -       +      +
    586E  LEU*     3.5    27.4    -      -       +      +
    587E  VAL      3.5     2.7    -      -       -      -
    588E  THR*     1.4    91.1    -      -       +      +
    590E  LEU*     1.3    61.4    +      -       +      +
    592E  LEU*     3.7     0.6    -      -       +      -
    593E  LEU*     2.8    31.3    +      -       -      +
   2001E  GBM      5.9     0.7    -      -       +      -
----------------------------------------------------------
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Residues in contact with LEU 590 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    445E  ILE*     3.7    28.5    -      -       +      -
    467E  ILE*     3.6    37.5    -      -       +      +
    470E  LEU*     3.7    26.5    -      -       +      -
    471E  ALA*     4.6    15.2    -      -       +      +
    474E  GLN*     3.1    12.3    -      -       -      +
    586E  LEU*     3.2    25.6    -      -       +      +
    587E  VAL*     3.2     4.6    +      -       -      +
    589E  PRO*     1.3    76.5    -      -       +      +
    591E  PHE*     1.3    62.6    +      -       -      +
    593E  LEU*     3.0    23.1    +      -       +      +
    594E  SER*     3.1     9.0    +      -       -      -
----------------------------------------------------------
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Residues in contact with PHE 591 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    474E  GLN*     3.5    22.0    +      -       +      +
    543E  SER*     6.1     1.1    -      -       -      -
    544E  ILE*     6.4     0.7    -      -       +      -
    547E  ASN*     3.2    40.8    -      -       -      +
    587E  VAL*     3.0    23.2    +      -       +      +
    588E  THR*     4.2     2.9    -      -       -      +
    590E  LEU*     1.3    77.0    -      -       -      +
    592E  LEU*     1.3    76.8    +      -       +      +
    594E  SER*     4.2     4.3    +      -       -      -
    595E  SER*     4.1     9.4    +      -       -      -
----------------------------------------------------------
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Residues in contact with LEU 592 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    434E  LEU*     5.7     6.1    -      -       +      -
    437E  ASN*     4.5     8.5    -      -       -      +
    441E  MET*     5.1     0.7    -      -       -      -
    588E  THR*     2.8    40.8    +      -       +      +
    589E  PRO*     4.0     3.4    -      -       +      +
    591E  PHE*     1.3    95.2    -      -       +      +
    593E  LEU*     1.3    59.6    +      -       -      +
    595E  SER*     2.5    27.7    +      -       -      +
    596E  VAL*     3.0    16.6    +      -       +      +
   2001E  GBM      3.2    58.8    -      -       +      +
----------------------------------------------------------
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Residues in contact with LEU 593 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    437E  ASN      4.9     0.7    -      -       -      +
    438E  LEU*     5.8     4.3    -      -       +      +
    441E  MET*     3.8    32.5    -      -       +      -
    442E  PRO*     5.7     1.6    -      -       +      -
    445E  ILE*     4.5    15.9    -      -       +      -
    471E  ALA*     5.6     7.0    -      -       +      -
    589E  PRO      2.8    18.4    +      -       -      +
    590E  LEU*     3.0    12.0    +      -       +      +
    592E  LEU*     1.3    77.1    -      -       -      +
    594E  SER*     1.3    61.5    +      -       -      +
    596E  VAL*     3.2    18.1    +      -       +      +
    597E  VAL*     2.9    39.2    +      -       +      +
----------------------------------------------------------
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Residues in contact with SER 594 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    471E  ALA*     3.4    14.0    +      -       -      +
    474E  GLN*     2.5    46.8    +      -       -      +
    475E  TYR*     4.4    15.5    -      -       -      +
    478E  ALA*     6.0     3.4    -      -       -      +
    590E  LEU      3.1     5.9    +      -       -      -
    591E  PHE      4.6     2.9    -      -       -      -
    592E  LEU      3.3     0.2    -      -       -      -
    593E  LEU*     1.3    76.7    -      -       -      +
    595E  SER*     1.3    61.6    +      -       -      +
    597E  VAL*     3.2     9.3    +      -       -      +
    598E  ARG*     3.1    22.2    +      -       -      +
----------------------------------------------------------
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Residues in contact with SER 595 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    434E  LEU*     4.2    12.1    -      -       -      +
    591E  PHE      4.1     5.0    +      -       -      -
    592E  LEU*     2.5    33.6    +      -       -      +
    594E  SER*     1.3    76.0    -      -       -      +
    596E  VAL*     1.3    55.1    +      -       -      +
    598E  ARG*     3.4    23.7    +      -       -      +
    599E  SER*     2.4    39.7    +      -       -      -
----------------------------------------------------------
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Residues in contact with VAL 596 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    431E  PHE*     6.3     0.4    -      -       +      -
    434E  LEU*     3.7    43.1    -      -       +      +
    437E  ASN*     4.4    19.1    -      -       +      +
    438E  LEU*     5.0    14.6    -      -       +      +
    592E  LEU*     3.0    17.6    +      -       +      +
    593E  LEU*     3.2    23.7    +      -       +      +
    595E  SER*     1.3    82.6    +      -       -      +
    597E  VAL*     1.3    57.2    +      -       +      +
    599E  SER*     3.1     7.9    +      -       -      -
    600E  THR*     2.9    39.2    +      -       +      +
----------------------------------------------------------
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Residues in contact with VAL 597 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    475E  TYR*     3.9    27.8    -      -       +      -
    593E  LEU*     2.9    32.5    +      -       +      +
    594E  SER*     3.2    10.3    +      -       -      +
    596E  VAL*     1.3    77.9    -      -       +      +
    598E  ARG*     1.3    61.3    +      -       -      +
    600E  THR*     2.6    23.1    +      -       -      +
    601E  VAL*     3.1    16.5    +      -       +      +
----------------------------------------------------------
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Residues in contact with ARG 598 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    475E  TYR*     5.4     8.5    -      -       +      -
    478E  ALA*     3.4    43.2    +      -       +      +
    481E  LEU*     4.5    13.1    -      -       -      +
    482E  SER*     5.8     6.1    -      -       -      -
    594E  SER      3.1    14.8    +      -       -      +
    595E  SER*     3.8    20.9    +      -       -      +
    596E  VAL      3.3     0.2    -      -       -      -
    597E  VAL*     1.3    77.3    -      -       -      +
    599E  SER*     1.3    57.3    +      -       -      +
    601E  VAL*     3.3    11.3    +      -       +      +
    602E  LYS*     3.0    64.7    +      -       +      +
----------------------------------------------------------
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Residues in contact with SER 599 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    427E  GLN*     5.3     2.0    -      -       -      +
    430E  TRP*     5.9     1.9    -      -       -      +
    431E  PHE*     4.0    24.1    -      -       -      +
    434E  LEU*     4.1    14.9    -      -       -      +
    595E  SER*     2.4    25.8    +      -       -      -
    596E  VAL*     3.1    10.1    +      -       -      -
    598E  ARG*     1.3    78.8    +      -       -      +
    600E  THR*     1.3    56.5    +      -       -      +
    602E  LYS*     3.3    12.0    +      -       -      +
    603E  ALA*     2.8    26.0    +      -       -      +
----------------------------------------------------------
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Residues in contact with THR 600 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    431E  PHE*     3.4    25.8    -      -       +      -
    438E  LEU*     4.8    17.7    -      -       +      -
    596E  VAL*     2.9    25.5    +      -       +      +
    597E  VAL*     2.6    26.2    +      -       -      +
    599E  SER*     1.3    74.6    -      -       -      +
    601E  VAL*     1.3    63.9    +      -       -      +
    603E  ALA*     3.2     7.2    +      -       -      +
    604E  LEU*     3.0    31.8    +      -       -      +
----------------------------------------------------------
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Residues in contact with VAL 601 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    475E  TYR*     5.2     9.6    -      -       +      +
    597E  VAL*     3.1    22.4    +      -       +      +
    598E  ARG*     3.5    11.7    -      -       +      +
    600E  THR*     1.3    77.2    +      -       -      +
    602E  LYS*     1.3    63.9    +      -       +      +
    604E  LEU*     3.2    10.3    +      -       -      +
    605E  VAL*     3.1    31.5    +      -       +      +
----------------------------------------------------------
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Residues in contact with LYS 602 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    424E  ASP*     5.3     0.3    -      -       -      +
    427E  GLN*     3.3    41.9    +      -       +      +
    598E  ARG*     3.0    50.3    +      -       +      +
    599E  SER*     3.6    10.8    -      -       -      +
    601E  VAL*     1.3    77.7    -      -       +      +
    603E  ALA*     1.3    56.3    +      -       -      +
    605E  VAL*     3.3    11.0    +      -       +      +
    606E  SER*     2.8    31.3    +      -       -      -
----------------------------------------------------------
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Residues in contact with ALA 603 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    288E  TRP*     5.6     0.6    +      -       -      -
    427E  GLN*     6.0     2.0    -      -       -      -
    428E  LEU*     5.4     6.1    -      -       +      +
    431E  PHE*     3.7    29.8    -      -       +      -
    599E  SER      2.8    15.2    +      -       -      +
    600E  THR*     3.3    15.0    -      -       -      +
    601E  VAL      3.2     0.2    -      -       -      -
    602E  LYS*     1.3    74.7    -      -       -      +
    604E  LEU*     1.3    71.7    +      -       +      +
    606E  SER*     3.1     7.3    +      -       -      +
    607E  VAL*     3.0    24.7    +      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 604 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    288E  TRP*     4.0    27.6    -      -       +      -
    600E  THR*     3.0    18.7    +      -       -      +
    601E  VAL*     3.2     9.4    +      -       +      +
    603E  ALA*     1.3    80.6    -      -       +      +
    605E  VAL*     1.3    58.2    +      -       +      +
    607E  VAL*     3.2     8.0    -      -       -      +
    608E  GLN*     2.9    42.6    +      -       -      +
----------------------------------------------------------
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Residues in contact with VAL 605 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    424E  ASP*     5.0     7.0    -      -       -      +
    601E  VAL*     3.3    21.5    -      -       +      +
    602E  LYS*     3.4    12.6    -      -       -      +
    603E  ALA      3.1     0.2    -      -       -      -
    604E  LEU*     1.3    78.5    -      -       +      +
    606E  SER*     1.3    58.2    +      -       -      +
    608E  GLN*     3.2    13.4    +      -       -      +
    609E  LYS*     2.9    51.9    +      -       +      +
----------------------------------------------------------
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Residues in contact with SER 606 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    420E  LEU*     5.4     0.2    -      -       -      +
    424E  ASP*     3.0    54.3    +      -       -      +
    427E  GLN*     3.8     6.4    -      -       -      +
    428E  LEU*     4.3    19.0    -      -       -      +
    602E  LYS      2.8    16.9    +      -       -      -
    603E  ALA*     3.1     6.5    +      -       -      -
    605E  VAL*     1.3    77.9    -      -       -      +
    607E  VAL*     1.3    57.8    +      -       -      +
    609E  LYS*     3.3     1.9    +      -       -      +
    610E  LEU*     2.9    30.4    +      -       -      +
----------------------------------------------------------
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Residues in contact with VAL 607 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    284E  ALA      5.5     4.9    -      -       -      +
    287E  ILE*     4.8    18.2    -      -       +      -
    288E  TRP*     3.4    54.5    -      -       +      +
    291E  LEU*     5.9     1.1    -      -       +      -
    428E  LEU*     5.5     4.8    -      -       +      +
    603E  ALA      3.0    14.8    +      -       -      +
    604E  LEU*     3.2    16.6    -      -       -      +
    606E  SER*     1.3    76.3    -      -       -      +
    608E  GLN*     1.3    59.9    +      -       +      +
    610E  LEU*     3.8     6.2    -      -       +      +
    611E  SER*     2.8    44.1    +      -       -      +
----------------------------------------------------------
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Residues in contact with GLN 608 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    604E  LEU*     2.9    33.8    +      -       +      +
    605E  VAL*     3.2    15.9    +      -       +      +
    607E  VAL*     1.3    80.7    -      -       +      +
    609E  LYS*     1.3    61.7    +      -       +      +
    611E  SER*     3.4     6.8    +      -       -      -
    612E  GLU*     3.0    34.7    +      -       -      +
----------------------------------------------------------
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Residues in contact with LYS 609 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    420E  LEU*     3.9    11.2    -      -       +      +
    424E  ASP*     3.8    22.9    -      -       -      +
    605E  VAL*     2.9    36.9    +      -       +      +
    606E  SER      4.0     0.9    -      -       -      +
    608E  GLN*     1.3    77.2    -      -       -      +
    610E  LEU*     1.3    61.0    +      -       -      +
    612E  GLU*     3.2    33.0    +      -       -      +
    613E  PHE*     2.9    27.5    +      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 610 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    287E  ILE*     4.7    24.9    -      -       +      -
    291E  LEU*     6.3     0.9    -      -       +      -
    391E  ILE*     4.6    24.2    -      -       +      -
    394E  LYS*     6.2     4.9    -      -       +      -
    395E  ILE*     4.2    27.6    -      -       +      -
    420E  LEU*     4.6     8.0    -      -       +      +
    428E  LEU*     5.6     5.6    -      -       +      -
    606E  SER      2.9    17.7    +      -       -      +
    607E  VAL*     4.0     6.3    -      -       +      +
    609E  LYS*     1.3    73.9    -      -       -      +
    611E  SER*     1.3    60.6    +      -       -      +
    613E  PHE*     4.3    11.7    -      -       +      +
    614E  LEU*     2.9    38.7    +      -       +      +
----------------------------------------------------------
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Residues in contact with SER 611 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    287E  ILE*     4.4    16.7    -      -       -      +
    607E  VAL*     2.8    34.2    +      -       -      +
    608E  GLN*     3.6     7.4    -      -       -      -
    610E  LEU*     1.3    76.6    -      -       -      +
    612E  GLU*     1.3    64.9    +      -       -      +
    614E  LEU*     4.0     1.1    -      -       -      +
    615E  SER*     3.2    21.8    +      -       -      -
----------------------------------------------------------
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Residues in contact with GLU 612 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    608E  GLN*     3.0    22.2    +      -       -      +
    609E  LYS*     3.3    42.2    +      -       -      +
    610E  LEU      3.2     0.2    -      -       -      -
    611E  SER*     1.3    78.6    -      -       -      +
    613E  PHE*     1.3    62.9    +      -       -      +
    615E  SER*     3.3    19.9    -      -       -      +
----------------------------------------------------------
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Residues in contact with PHE 613 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    395E  ILE*     3.8    25.6    -      -       +      -
    398E  LYS*     2.6    54.9    +      -       +      -
    399E  ILE*     3.8    25.6    -      -       +      -
    402E  MET*     5.4    10.1    -      -       +      -
    417E  ILE*     4.6    25.6    -      -       +      -
    420E  LEU*     3.9    25.6    -      -       +      -
    609E  LYS      2.9    15.8    +      -       -      +
    610E  LEU*     3.3    12.3    +      -       +      +
    612E  GLU*     1.3    77.2    -      -       -      +
    614E  LEU*     1.3    52.6    +      -       +      +
    615E  SER      2.9     4.2    -      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 614 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    270E  PHE*     6.3     2.5    -      -       +      -
    287E  ILE*     4.8    14.1    -      -       +      -
    394E  LYS*     6.0     8.5    -      -       +      -
    398E  LYS*     3.2    25.1    +      -       +      +
    610E  LEU*     2.9    26.9    +      -       +      +
    611E  SER*     4.4     1.8    -      -       -      +
    613E  PHE*     1.3    74.8    -      -       +      +
    615E  SER*     1.3    61.6    +      -       -      +
----------------------------------------------------------
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Residues in contact with SER 615 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    398E  LYS*     2.5    26.6    +      -       -      -
    402E  MET*     5.6     0.2    -      -       -      +
    611E  SER      3.2    11.7    +      -       -      -
    612E  GLU*     3.3    17.0    -      -       -      +
    613E  PHE      2.9     6.5    -      -       -      +
    614E  LEU*     1.3    79.8    -      -       -      +
----------------------------------------------------------
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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