Contacts of the helix formed by residues 299 - 321 (chain E) in PDB entry 3ZXR


Residue contacts within the protein are derived with the CSU software (Sobolev V., Sorokine A., Prilusky J., Abola E.E. and Edelman M. (1999) Automated analysis of interatomic contacts in proteins. Bioinformatics, 15, 327-332). A short description of the analytical approach is given at the end of the page.
For CSU analysis of other PDB entry

Note:
Non-standard 3 letter residue codes indicate a heterogroup. To identify and analyse, use LPC software

Legend:
Dist - nearest distance (Å) between atoms of two residues
Surf - contact surface area (Å2) between two residues
HB   - hydrophilic-hydrophilic contact (hydrogen bond)
Arom - aromatic-aromatic contact
Phob - hydrophobic-hydrophobic contact
DC   - hydrophobic-hydrophilic contact (destabilizing contact)
+/-  - indicates presence/absence of a specific contacts
*    - indicates residues forming contacts  by their side chain
       (including CA atoms)
Residues in contact with SER 299 (chain E).
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    288E  LEU      2.5    29.2    +      -       -      -
    289E  MET      2.7    18.1    +      -       -      -
    290E  TYR      3.8    11.7    -      -       -      -
    291E  ASP*     3.5    13.8    -      -       -      +
    298E  LEU*     1.3    75.5    -      -       -      +
    300E  ASP*     1.3    60.3    +      -       -      +
    301E  THR*     3.5     5.0    +      -       -      -
    302E  ALA      3.3    12.3    +      -       -      -
    303E  ARG*     2.9    30.0    +      -       -      +
----------------------------------------------------------
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Residues in contact with ASP 300 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    291E  ASP*     5.1     4.8    +      -       -      +
    299E  SER*     1.3    72.2    -      -       -      +
    301E  THR*     1.3    60.4    +      -       -      +
    303E  ARG*     2.7    41.2    +      -       -      +
    304E  HIS*     2.9    50.6    +      -       +      -
----------------------------------------------------------
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Residues in contact with THR 301 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    124E  ILE*     4.6     7.4    -      -       +      -
    281E  LEU*     4.5    11.4    -      -       +      -
    288E  LEU*     4.1    23.1    +      -       +      +
    289E  MET*     5.4     2.7    -      -       -      -
    299E  SER*     3.3     9.3    +      -       -      -
    300E  ASP*     1.3    79.1    -      -       -      +
    302E  ALA*     1.3    56.0    +      -       -      +
    304E  HIS*     4.7     2.7    -      -       -      -
    305E  TYR*     3.0    27.3    +      -       -      +
    391E  ILE*     3.5    37.5    -      -       +      +
----------------------------------------------------------
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Residues in contact with ALA 302 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    289E  MET*     3.4    56.5    -      -       +      +
    298E  LEU*     3.9    15.3    -      -       +      -
    299E  SER*     3.3    11.5    +      -       -      +
    301E  THR*     1.3    75.1    -      -       -      +
    303E  ARG*     1.3    64.6    +      -       -      +
    305E  TYR*     3.0     4.6    +      -       -      +
    306E  ILE*     3.0    28.1    +      -       +      +
    365E  LEU*     4.6     0.3    -      -       -      +
----------------------------------------------------------
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Residues in contact with ARG 303 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    295E  TYR*     6.4     1.6    -      -       -      -
    298E  LEU*     4.7    11.9    +      -       +      +
    299E  SER      2.9    14.8    +      -       -      +
    300E  ASP*     2.7    39.9    +      -       -      +
    302E  ALA*     1.3    75.7    -      -       -      +
    304E  HIS*     1.3    63.4    +      -       -      +
    306E  ILE*     3.2    12.7    +      -       -      +
    307E  GLY      2.8    22.3    +      -       -      -
    342E  TYR*     4.1    19.1    -      -       +      +
    396E  GLU*     2.9    37.6    +      -       -      -
    397E  PRO*     3.5    23.8    -      -       +      +
----------------------------------------------------------
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Residues in contact with HIS 304 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    300E  ASP*     2.9    37.9    +      -       +      +
    301E  THR*     3.9     4.2    +      -       -      +
    303E  ARG*     1.3    78.4    +      -       -      +
    305E  TYR*     1.3    61.1    +      -       -      +
    307E  GLY*     3.2     1.0    +      -       -      -
    308E  GLY      2.9    23.9    +      -       -      -
    390E  GLY*     3.3    24.7    -      -       -      +
    391E  ILE*     3.8    13.0    +      -       +      +
    394E  LYS*     3.5    42.0    -      -       +      +
    395E  ILE      3.4    17.7    -      -       -      +
    396E  GLU*     2.8    30.2    +      -       -      -
----------------------------------------------------------
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Residues in contact with TYR 305 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    130E  PHE*     4.4     3.1    -      -       -      -
    279E  GLN*     2.7    39.1    +      -       +      +
    280E  SER      6.5     0.2    -      -       -      -
    281E  LEU*     3.9    23.9    -      -       +      +
    289E  MET*     4.9     4.5    -      -       +      -
    301E  THR      3.0    15.9    +      -       -      +
    302E  ALA*     3.0    12.3    +      -       -      +
    304E  HIS*     1.3    71.7    -      -       -      +
    306E  ILE*     1.3    64.7    +      -       -      +
    308E  GLY*     3.2     3.1    +      -       -      -
    309E  LEU*     3.0    37.1    +      -       +      +
    365E  LEU*     3.5    20.6    -      -       +      -
    383E  MET      3.7     1.1    +      -       -      -
    384E  LEU*     3.5    33.9    +      -       +      +
    387E  GLY*     3.6    34.4    -      -       -      +
    388E  LEU      4.4     0.2    -      -       -      -
    391E  ILE*     3.8    14.3    -      -       +      +
----------------------------------------------------------
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Residues in contact with ILE 306 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    298E  LEU*     3.8    18.6    -      -       +      -
    302E  ALA      3.0    17.7    +      -       -      +
    303E  ARG*     3.5     8.5    -      -       -      +
    305E  TYR*     1.3    71.9    -      -       -      +
    307E  GLY*     1.3    66.6    +      -       -      +
    309E  LEU*     3.1     8.8    +      -       +      +
    310E  LEU*     2.9    36.7    +      -       +      +
    342E  TYR*     3.8    37.0    -      -       +      -
    351E  VAL*     4.1     9.6    -      -       +      -
    353E  ILE*     3.7    29.6    -      -       +      -
    365E  LEU*     3.7    24.7    -      -       +      -
    397E  PRO*     4.3     4.3    -      -       +      -
----------------------------------------------------------
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Residues in contact with GLY 307 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    303E  ARG      2.8    12.1    +      -       -      -
    304E  HIS      3.2     5.1    +      -       -      -
    306E  ILE*     1.3    76.8    -      -       -      +
    308E  GLY*     1.3    54.2    +      -       -      +
    310E  LEU*     4.1     1.1    -      -       -      +
    311E  HIS*     2.9    33.3    +      -       -      +
    395E  ILE*     3.5    24.7    -      -       -      +
    397E  PRO*     3.9    19.6    -      -       -      +
----------------------------------------------------------
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Residues in contact with GLY 308 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    304E  HIS      2.9    11.5    +      -       -      -
    305E  TYR      3.2     2.6    +      -       -      -
    307E  GLY*     1.3    72.4    -      -       -      +
    309E  LEU*     1.3    55.6    +      -       -      +
    311E  HIS*     4.5     3.6    -      -       -      -
    312E  HIS*     2.8    41.4    +      -       -      +
    386E  ALA      3.3    25.4    -      -       -      -
    390E  GLY*     3.7    13.8    -      -       -      -
    395E  ILE*     4.5     3.8    -      -       -      -
----------------------------------------------------------
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Residues in contact with LEU 309 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    279E  GLN*     4.4     1.1    -      -       -      +
    305E  TYR*     3.0    30.7    +      -       +      +
    306E  ILE*     3.1    11.6    +      -       -      +
    308E  GLY*     1.3    73.2    -      -       -      +
    310E  LEU*     1.3    62.5    +      -       +      +
    312E  HIS      3.8     0.3    -      -       -      -
    313E  ALA*     2.9    29.8    +      -       -      +
    316E  LEU*     3.8    26.4    -      -       +      +
    351E  VAL*     4.6     4.5    -      -       +      -
    365E  LEU*     3.7    30.1    -      -       +      -
    367E  PHE*     4.2    30.3    -      -       +      -
    383E  MET*     3.6    34.5    -      -       +      +
    386E  ALA*     4.2     3.3    +      -       +      -
    387E  GLY      4.4     0.2    -      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 310 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    306E  ILE*     2.9    35.3    +      -       +      +
    307E  GLY*     4.3     2.7    -      -       -      +
    309E  LEU*     1.3    79.5    -      -       -      +
    311E  HIS*     1.3    62.6    +      -       -      +
    313E  ALA*     3.4    15.1    -      -       +      +
    314E  PRO*     4.2     0.5    -      -       -      +
    340E  LEU*     3.6    48.5    -      -       +      +
    341E  VAL*     3.9     0.2    -      -       -      -
    342E  TYR*     3.8    26.5    -      -       +      +
    350E  CYS*     3.9    28.7    -      -       +      -
    351E  VAL*     4.1    13.0    -      -       +      -
    367E  PHE*     4.9     2.2    -      -       +      -
    397E  PRO*     4.7     9.4    -      -       +      -
    398E  GLN*     5.7     3.6    -      -       +      +
----------------------------------------------------------
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Residues in contact with HIS 311 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    307E  GLY      2.9    20.5    +      -       -      +
    308E  GLY      3.8     1.6    -      -       -      +
    310E  LEU*     1.3    79.0    -      -       -      +
    312E  HIS*     1.3    90.2    +      +       -      +
    314E  PRO*     3.4    12.5    -      -       -      +
    395E  ILE*     3.9    29.1    -      -       +      +
    429E  ARG*     5.3     3.7    +      -       -      -
    433E  ASP*     5.8     1.2    +      -       -      -
----------------------------------------------------------
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Residues in contact with HIS 312 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    308E  GLY*     2.8    29.2    +      -       -      +
    309E  LEU      3.8     0.4    -      -       -      -
    311E  HIS*     1.3    95.9    +      +       -      +
    313E  ALA*     1.3    64.6    +      -       -      +
    314E  PRO*     3.2     3.8    -      -       -      -
    315E  SER*     2.9     9.7    +      -       -      -
    316E  LEU*     2.8    20.7    +      -       +      -
    386E  ALA*     3.9    23.8    -      -       +      -
    389E  ASP*     2.7    30.1    +      -       +      -
    395E  ILE*     5.1     0.2    -      -       +      -
    433E  ASP*     4.6    12.1    +      -       -      -
    436E  TYR*     3.4    52.2    -      +       +      +
----------------------------------------------------------
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Residues in contact with ALA 313 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    309E  LEU      2.9    13.9    +      -       -      +
    310E  LEU*     3.4    16.6    -      -       +      +
    311E  HIS      3.3     0.2    -      -       -      -
    312E  HIS*     1.3    75.3    -      -       -      +
    314E  PRO*     1.4    69.2    -      -       +      +
    315E  SER      3.0     1.9    +      -       -      -
    316E  LEU*     3.9     8.1    -      -       -      -
    317E  LEU*     3.0    40.0    +      -       +      +
    340E  LEU*     3.6    27.6    -      -       +      -
    350E  CYS*     5.9     0.2    -      -       -      -
    367E  PHE*     5.6     3.6    -      -       +      -
    420E  PRO*     5.2     1.3    -      -       +      -
----------------------------------------------------------
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Residues in contact with PRO 314 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    310E  LEU      4.2     2.5    -      -       -      +
    311E  HIS      3.4    13.7    -      -       -      +
    312E  HIS      3.3     5.2    -      -       -      -
    313E  ALA*     1.4    94.3    -      -       +      +
    315E  SER*     1.3    56.7    +      -       -      +
    340E  LEU*     4.5    10.8    -      -       +      -
    420E  PRO*     4.3    15.4    -      -       +      +
    426E  VAL*     3.5    29.1    -      -       -      +
    429E  ARG*     3.5    45.6    -      -       +      +
----------------------------------------------------------
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Residues in contact with SER 315 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    312E  HIS*     2.9     7.4    +      -       -      -
    314E  PRO*     1.3    76.7    -      -       -      +
    316E  LEU*     1.3    67.5    +      -       -      +
    317E  LEU      3.1     2.5    -      -       -      -
    318E  ALA*     3.0    23.4    +      -       -      +
    319E  PHE*     4.5     1.0    +      -       -      -
    426E  VAL      4.3     4.3    -      -       -      -
    429E  ARG*     3.9    11.0    -      -       -      +
    430E  LEU*     3.8    22.3    -      -       -      +
    433E  ASP*     3.6    20.4    +      -       -      -
    436E  TYR*     2.7    37.3    +      -       -      -
----------------------------------------------------------
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Residues in contact with LEU 316 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    309E  LEU*     3.8    41.1    -      -       +      +
    312E  HIS*     2.8    18.9    +      -       +      +
    313E  ALA*     3.9     3.4    -      -       -      +
    315E  SER*     1.3    77.6    +      -       -      +
    317E  LEU*     1.3    57.7    +      -       +      +
    319E  PHE*     2.9    22.4    +      -       -      +
    320E  THR*     3.2    22.5    +      -       +      +
    367E  PHE*     3.9    17.9    -      -       +      -
    382E  ALA*     3.5    43.3    -      -       +      +
    383E  MET*     3.6     4.0    -      -       -      +
    386E  ALA*     3.9    10.8    -      -       +      -
    436E  TYR*     3.3    11.9    -      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 317 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    313E  ALA*     3.0    30.5    +      -       +      +
    315E  SER      3.1     0.4    -      -       -      -
    316E  LEU*     1.3    77.1    -      -       +      +
    318E  ALA*     1.3    59.4    +      -       -      +
    319E  PHE      3.1     0.4    -      -       -      -
    320E  THR*     3.1    19.1    -      -       -      +
    321E  ASN*     2.7    40.3    +      -       -      +
    327E  TYR*     3.6    15.3    -      -       +      +
    330E  LEU*     4.0    17.0    -      -       +      -
    340E  LEU*     5.9     1.3    -      -       +      -
    350E  CYS*     6.2     0.4    -      -       -      -
    367E  PHE*     4.3    11.0    -      -       +      -
    369E  SER*     3.3    30.7    -      -       -      +
    419E  THR*     5.0     4.0    -      -       +      -
    420E  PRO*     3.7    26.2    -      -       +      -
    426E  VAL*     4.1     7.0    -      -       +      -
----------------------------------------------------------
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Residues in contact with ALA 318 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    315E  SER      3.0    16.6    +      -       -      +
    316E  LEU      3.0     0.4    +      -       -      -
    317E  LEU*     1.3    78.0    -      -       -      +
    319E  PHE*     1.3    57.8    +      -       +      +
    321E  ASN      4.9     0.7    -      -       -      -
    322E  PRO*     3.3    17.2    -      -       -      +
    426E  VAL*     3.7    28.2    -      -       +      +
    427E  ILE*     4.0    13.0    -      -       +      +
    430E  LEU*     3.8    26.9    -      -       +      -
    451E  TRP*     3.0    19.7    +      -       -      -
    455E  LYS*     5.3     0.2    -      -       -      -
----------------------------------------------------------
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Residues in contact with PHE 319 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    315E  SER      5.0     1.1    -      -       -      -
    316E  LEU*     2.9     7.5    +      -       -      +
    318E  ALA*     1.3    79.5    -      -       +      +
    320E  THR*     1.3    61.9    +      -       -      +
    321E  ASN      3.5     0.7    -      -       -      -
    322E  PRO*     3.9    10.9    -      -       -      +
    375E  ASN      4.7     4.0    +      -       -      +
    378E  LEU*     3.9    25.9    -      -       +      +
    379E  ALA*     3.5    16.4    +      -       -      +
    382E  ALA*     3.9    31.2    -      -       +      -
    430E  LEU*     3.9    31.9    -      -       +      -
    437E  LEU*     3.9    11.0    -      -       +      -
    443E  PHE*     3.7    27.4    -      +       -      -
    447E  LEU*     4.8     3.8    -      -       +      -
    448E  ILE*     4.6     7.2    -      -       +      -
    451E  TRP*     3.4    56.6    -      +       +      -
----------------------------------------------------------
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Residues in contact with THR 320 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    275E  MET*     5.4     0.3    -      -       -      +
    316E  LEU*     3.2    21.0    +      -       +      -
    317E  LEU*     3.1    24.6    -      -       -      +
    319E  PHE*     1.3    80.3    -      -       -      +
    321E  ASN*     1.3    75.4    +      -       -      +
    322E  PRO*     3.5     6.9    -      -       -      +
    367E  PHE*     4.3     3.6    -      -       +      -
    370E  PRO*     3.4    13.8    -      -       -      +
    371E  ASP      3.1    29.8    +      -       -      +
    379E  ALA*     4.2     9.6    -      -       -      +
    383E  MET*     3.7    38.4    -      -       +      -
----------------------------------------------------------
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Residues in contact with ASN 321 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    317E  LEU*     2.7    19.0    +      -       +      +
    320E  THR*     1.3   101.6    +      -       -      +
    322E  PRO*     1.3    58.0    -      -       -      +
    323E  THR      3.3     0.2    +      -       -      -
    326E  SER*     3.3    19.3    +      -       -      -
    327E  TYR*     2.9    38.4    +      -       +      +
    329E  ARG*     3.9     4.4    -      -       -      +
    330E  LEU*     3.8    17.6    -      -       -      +
    369E  SER*     2.8    42.2    +      -       -      +
    371E  ASP*     3.5    14.6    +      -       -      -
    423E  LEU*     3.9     1.2    -      -       -      +
----------------------------------------------------------
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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