Contacts of the helix formed by residues 39 - 63 (chain D) in PDB entry 1ORZ


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 TYR 39 (chain D).
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    208B  ASN*     2.6    74.1    +      -       +      -
    214B  TYR*     2.9    22.9    -      +       -      -
    243B  LEU*     2.9    54.1    +      -       +      +
     27D  PRO*     3.1     8.7    -      -       +      -
     28D  PRO*     2.7    48.2    -      -       +      +
     29D  GLU      3.5     6.5    -      -       -      +
     38D  TRP*     1.3    85.0    -      +       -      +
     40D  MET*     1.3    58.4    +      -       -      +
     42D  LYS*     3.3     5.9    +      -       -      +
     43D  ILE*     3.1    15.4    +      -       -      +
----------------------------------------------------------
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Residues in contact with MET 40 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     25D  VAL*     3.1    13.9    -      -       +      -
     26D  PRO*     3.7    26.7    -      -       +      -
     27D  PRO*     2.9    25.3    -      -       +      +
     36D  TYR      5.9     0.9    -      -       -      +
     37D  HIS*     6.0     7.9    -      -       +      -
     38D  TRP      2.9     6.9    +      -       -      +
     39D  TYR*     1.3    67.9    -      -       -      +
     41D  GLU*     1.3    67.5    +      -       -      +
     43D  ILE*     2.7    38.7    -      -       +      +
     44D  PHE*     2.8    47.5    +      -       +      -
----------------------------------------------------------
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Residues in contact with GLU 41 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    210B  SER*     4.0    14.7    -      -       -      +
    214B  TYR*     5.1     0.2    -      -       -      +
    215B  ARG*     5.2     6.5    +      -       -      -
     23D  ALA*     4.8     6.5    -      -       -      +
     25D  VAL*     2.9    31.8    -      -       +      +
     27D  PRO      3.3     0.6    +      -       -      +
     28D  PRO*     2.6    25.9    +      -       -      +
     29D  GLU*     3.1    37.0    +      -       +      +
     40D  MET*     1.3    71.8    -      -       -      +
     42D  LYS*     1.3    61.5    +      -       -      -
     45D  ALA      3.1     1.7    +      -       -      -
     80D  MET*     2.8    58.3    -      -       +      +
     83D  ASN*     4.6    10.9    +      -       -      -
     84D  SER*     4.6     5.7    -      -       -      -
----------------------------------------------------------
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Residues in contact with LYS 42 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    113C  HIS*     4.0    18.1    -      -       -      -
    114C  LEU*     3.4    26.9    -      -       -      +
    117C  ASP*     3.4    23.8    -      -       -      -
     28D  PRO      2.7    13.5    +      -       -      -
     29D  GLU*     2.9    13.2    -      -       +      +
     30D  ASN*     2.8    32.3    -      -       -      +
     31D  LYS*     2.8    31.8    +      -       +      +
     39D  TYR      4.2     0.2    -      -       -      +
     41D  GLU*     1.3    73.6    -      -       -      +
     43D  ILE*     1.3    60.0    +      -       -      +
     45D  ALA*     3.0    10.8    +      -       +      +
     46D  LEU*     2.7    49.5    +      -       -      +
     49D  VAL*     5.0     0.6    -      -       -      +
----------------------------------------------------------
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Residues in contact with ILE 43 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     31D  LYS*     2.9    37.2    -      -       +      +
     34D  GLY      4.1     9.1    -      -       -      +
     35D  SER*     3.8    20.9    -      -       -      +
     36D  TYR      3.9    21.3    -      -       -      +
     38D  TRP*     4.0     4.3    -      -       +      -
     39D  TYR      3.1    18.2    -      -       -      +
     40D  MET*     2.7    45.3    +      -       +      +
     42D  LYS*     1.3    76.7    -      -       -      +
     44D  PHE*     1.3    69.8    +      -       +      +
     46D  LEU*     3.7     1.0    -      -       -      +
     47D  SER*     2.8    32.0    +      -       -      -
----------------------------------------------------------
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Residues in contact with PHE 44 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     24D  TYR*     6.3     2.2    -      -       +      -
     25D  VAL*     3.5     7.6    -      -       +      -
     35D  SER*     5.9     0.2    -      -       -      -
     40D  MET*     2.8    53.8    +      -       +      -
     43D  ILE*     1.3    88.6    -      -       +      +
     45D  ALA*     1.3    62.9    +      -       -      +
     47D  SER*     3.2     5.7    +      -       -      -
     48D  VAL*     2.9    31.8    +      -       +      +
     77D  TYR*     3.9    40.8    -      +       +      +
     80D  MET*     3.4    19.5    -      -       +      -
----------------------------------------------------------
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Residues in contact with ALA 45 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     29D  GLU*     5.4     2.5    -      -       -      +
     41D  GLU      3.1     9.0    +      -       -      +
     42D  LYS*     3.0    17.7    +      -       +      +
     44D  PHE*     1.3    76.4    -      -       -      +
     46D  LEU*     1.3    61.9    +      -       -      +
     48D  VAL*     3.9     4.6    -      -       -      +
     49D  VAL*     2.9    28.7    +      -       -      +
     77D  TYR      6.4     0.2    -      -       -      -
     78D  CYS*     5.4     6.4    -      -       -      +
     80D  MET*     3.1    30.4    -      -       +      +
     81D  GLU*     5.0    11.9    -      -       +      +
----------------------------------------------------------
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Residues in contact with LEU 46 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    114C  LEU*     2.9    42.8    -      -       +      +
     31D  LYS      4.1     4.3    -      -       -      +
     32D  LEU*     2.9    43.5    -      -       -      +
     33D  GLU*     2.9    43.3    -      -       +      +
     34D  GLY      5.8     0.2    -      -       -      +
     42D  LYS*     2.7    30.9    +      -       +      +
     43D  ILE      4.0     1.6    -      -       -      +
     45D  ALA*     1.3    74.2    -      -       -      +
     47D  SER*     1.3    63.2    +      -       -      +
     49D  VAL*     2.9     2.5    -      -       +      +
     50D  PRO*     2.8    28.0    -      -       +      +
----------------------------------------------------------
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Residues in contact with SER 47 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     33D  GLU*     5.8     1.1    -      -       -      -
     34D  GLY*     5.3     9.1    +      -       -      +
     35D  SER*     5.0     9.8    +      -       -      -
     43D  ILE      2.8    19.0    +      -       -      -
     44D  PHE*     3.8     6.7    -      -       -      -
     46D  LEU*     1.3    79.0    -      -       -      +
     48D  VAL*     1.3    65.1    +      -       -      +
     50D  PRO*     3.5     5.2    -      -       -      +
     51D  LEU*     3.3    18.5    +      -       -      +
----------------------------------------------------------
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Residues in contact with VAL 48 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     44D  PHE*     2.9    20.2    +      -       +      +
     45D  ALA*     3.9     2.2    -      -       -      +
     47D  SER*     1.3    77.5    -      -       -      +
     49D  VAL*     1.3    65.3    +      -       -      +
     51D  LEU*     3.0     5.3    +      -       -      +
     52D  ALA*     2.8    26.3    +      -       +      +
     74D  LEU*     3.1    46.0    -      -       +      +
     75D  LEU      4.4     0.2    -      -       -      +
     77D  TYR*     3.6    32.1    -      -       +      -
     78D  CYS*     3.2    22.2    -      -       -      +
----------------------------------------------------------
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Residues in contact with VAL 49 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    106C  HIS*     5.6     5.6    -      -       +      +
    107C  TYR*     6.2     1.8    -      -       +      -
    110C  ALA*     4.4    18.6    -      -       +      -
    111C  ILE*     5.0     2.7    -      -       +      -
    114C  LEU*     3.9    15.9    -      -       +      -
     42D  LYS*     5.0     0.4    -      -       -      +
     45D  ALA      2.9    21.3    +      -       -      +
     46D  LEU*     2.9    30.3    -      -       +      +
     48D  VAL*     1.3    78.2    -      -       -      +
     50D  PRO*     1.3    74.3    -      -       +      +
     52D  ALA*     3.2     7.0    +      -       +      +
     53D  THR*     2.8    32.6    +      -       -      +
     78D  CYS*     5.3     1.1    -      -       -      -
----------------------------------------------------------
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Residues in contact with PRO 50 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    111C  ILE*     5.9     0.2    -      -       +      -
    114C  LEU*     3.8     4.9    -      -       +      -
     33D  GLU*     3.6    28.7    -      -       +      +
     46D  LEU*     2.8    28.2    -      -       +      +
     47D  SER*     4.2     3.4    -      -       -      +
     49D  VAL*     1.3    94.7    -      -       +      +
     51D  LEU*     1.3    62.3    +      -       -      +
     53D  THR*     3.1    17.6    +      -       -      +
     54D  THR*     3.1    14.2    +      -       -      -
----------------------------------------------------------
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Residues in contact with LEU 51 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     47D  SER      3.3    11.7    +      -       -      +
     48D  VAL*     3.0     5.7    +      -       -      +
     50D  PRO*     1.3    75.4    -      -       -      +
     52D  ALA*     1.3    58.4    +      -       -      +
     54D  THR*     2.7    34.6    -      -       +      +
     55D  ALA*     3.2     4.0    +      -       +      -
     67D  ASP*     5.2     3.6    -      -       -      +
     70D  PHE*     3.0    40.4    -      -       +      -
     71D  SER*     4.6     7.9    -      -       -      +
     74D  LEU*     2.9    29.2    -      -       +      -
----------------------------------------------------------
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Residues in contact with ALA 52 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    103C  PHE*     5.6     6.6    -      -       +      -
     48D  VAL*     2.8    23.3    +      -       +      +
     49D  VAL*     3.6     7.9    -      -       +      +
     51D  LEU*     1.3    80.2    -      -       -      +
     53D  THR*     1.3    63.4    +      -       -      +
     55D  ALA*     3.1     9.9    +      -       -      +
     56D  MET*     2.9    23.7    +      -       -      +
     71D  SER*     4.8     5.8    -      -       -      +
     74D  LEU*     4.1     4.4    -      -       +      +
----------------------------------------------------------
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Residues in contact with THR 53 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    107C  TYR*     5.6     6.5    -      -       +      +
    111C  ILE*     4.1    22.1    -      -       +      +
     49D  VAL*     2.8    30.9    +      -       -      +
     50D  PRO*     3.1    13.9    +      -       -      +
     52D  ALA*     1.3    76.5    -      -       -      +
     54D  THR*     1.3    60.4    +      -       -      +
     56D  MET*     2.8    22.7    -      -       +      +
     57D  LEU*     2.7    39.9    -      -       +      +
----------------------------------------------------------
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Residues in contact with THR 54 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     50D  PRO      3.1     6.6    +      -       -      +
     51D  LEU*     2.7    43.7    -      -       +      +
     53D  THR*     1.3    78.7    -      -       -      +
     55D  ALA*     1.3    65.0    +      -       -      +
     57D  LEU*     3.1     9.7    +      -       -      +
     58D  THR*     2.8    30.4    +      -       -      +
     67D  ASP*     5.6     2.5    -      -       -      +
----------------------------------------------------------
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Residues in contact with ALA 55 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     51D  LEU*     3.8     7.6    -      -       +      +
     52D  ALA      3.1     9.7    +      -       -      +
     54D  THR*     1.3    84.2    -      -       +      +
     56D  MET*     1.3    57.8    +      -       -      +
     58D  THR*     3.0     9.0    +      -       -      -
     59D  THR*     2.8    31.0    +      -       -      +
     62D  LEU*     4.8     0.3    -      -       -      +
     66D  ALA      5.0     5.7    -      -       -      +
     67D  ASP*     4.3    14.8    -      -       -      +
     71D  SER*     2.9    29.2    -      -       -      +
----------------------------------------------------------
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Residues in contact with MET 56 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    103C  PHE*     3.5    40.8    -      -       +      -
    107C  TYR*     4.1    36.3    -      -       +      -
     52D  ALA      2.9    10.1    +      -       -      +
     53D  THR*     2.8    31.9    -      -       -      +
     55D  ALA*     1.3    73.1    -      -       -      +
     57D  LEU*     1.3    79.8    +      -       +      +
     59D  THR*     2.7    13.0    -      -       +      +
     60D  GLY*     2.7    30.9    +      -       -      -
----------------------------------------------------------
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Residues in contact with LEU 57 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     53D  THR*     2.7    43.7    +      -       +      +
     54D  THR*     3.6     8.7    -      -       -      +
     56D  MET*     1.3   101.1    -      -       +      +
     58D  THR*     1.3    66.0    +      -       -      +
     61D  PRO*     2.8    32.0    -      -       +      +
    143D  SER*     5.5     0.7    +      -       -      -
    144D  GLN*     4.8    23.6    -      -       +      +
----------------------------------------------------------
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Residues in contact with THR 58 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     54D  THR*     2.8    23.2    +      -       -      +
     55D  ALA*     3.4    10.2    -      -       -      -
     57D  LEU*     1.3    78.2    -      -       -      +
     59D  THR*     1.3    48.8    -      -       -      +
     61D  PRO*     4.6     0.7    -      -       -      +
     62D  LEU*     2.5    71.6    +      -       +      +
     66D  ALA*     4.3     8.3    -      -       +      -
     67D  ASP*     4.5     7.7    +      -       -      +
    143D  SER*     4.6     5.2    +      -       -      +
----------------------------------------------------------
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Residues in contact with THR 59 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     55D  ALA      2.8     9.9    +      -       -      +
     56D  MET*     2.7    39.7    -      -       +      +
     58D  THR*     1.3    75.6    -      -       -      +
     60D  GLY*     1.3    60.4    +      -       -      +
     62D  LEU*     2.7    18.4    -      -       -      -
     63D  SER*     2.3    61.0    +      -       -      -
     65D  ALA*     3.1    24.8    +      -       +      +
     66D  ALA      4.6     0.4    -      -       -      -
----------------------------------------------------------
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Residues in contact with GLY 60 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     56D  MET*     2.7    19.6    +      -       -      -
     59D  THR*     1.3    76.3    -      -       -      +
     61D  PRO*     1.3    67.8    -      -       -      +
     63D  SER*     4.1     1.7    -      -       -      -
    139D  GLU*     4.0     5.3    -      -       -      +
    140D  LYS*     2.9    25.1    +      -       -      -
    141D  ASP      3.7     1.4    +      -       -      -
----------------------------------------------------------
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Residues in contact with PRO 61 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     56D  MET      4.4     0.2    -      -       -      +
     57D  LEU*     2.8    33.2    -      -       +      +
     60D  GLY*     1.3    80.2    -      -       -      +
     62D  LEU*     1.5    51.8    -      -       -      +
    140D  LYS*     2.3    34.5    -      -       -      +
    141D  ASP*     2.1    29.9    -      -       +      +
    142D  ASN      3.4     7.0    -      -       -      +
    143D  SER*     3.0    33.9    -      -       -      +
    144D  GLN*     4.3    18.4    -      -       +      +
----------------------------------------------------------
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Residues in contact with LEU 62 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     55D  ALA      4.8     0.2    -      -       -      +
     58D  THR*     2.5    44.0    +      -       +      +
     59D  THR*     2.7    24.4    +      -       -      +
     61D  PRO*     1.5    70.4    -      -       -      +
     63D  SER      1.4    48.2    -      -       -      +
     66D  ALA*     3.4    15.3    -      -       +      +
    132D  LYS*     2.7    29.6    -      -       -      +
    136D  ASP*     2.4    55.0    -      -       -      +
    137D  SER*     4.4     0.3    +      -       -      -
    140D  LYS*     2.8    22.4    -      -       -      +
    143D  SER*     4.2     1.7    +      -       -      +
----------------------------------------------------------
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Residues in contact with SER 63 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     59D  THR*     2.3    33.0    +      -       -      +
     60D  GLY*     4.8     1.2    -      -       -      -
     62D  LEU*     1.4    57.6    -      -       -      +
     64D  THR*     1.3    54.8    +      -       -      +
    135D  TRP*     2.4    25.8    +      -       -      -
    136D  ASP*     2.4    25.6    +      -       -      -
    138D  SER      2.8     0.9    +      -       -      -
    139D  GLU*     2.5    47.9    +      -       -      +
    140D  LYS*     2.9     9.4    -      -       -      +
----------------------------------------------------------
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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