Contacts of the helix formed by residues 277 - 301 (chain K) in PDB entry 4BOG


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 277 (chain K).
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    135K  PHE*     2.9    30.5    +      +       -      -
    136K  PRO*     2.5    19.4    -      -       +      +
    137K  PHE*     2.4    42.7    +      +       +      +
    138K  ASP*     4.6     0.4    -      -       -      -
    210K  ILE*     3.5    10.6    -      -       +      +
    273K  LEU*     4.0    17.5    -      -       +      -
    274K  ILE*     2.5    65.1    +      -       +      +
    276K  LYS*     1.3    70.8    -      -       -      +
    278K  MET*     1.3    58.8    +      -       -      +
    280K  PHE*     2.7    61.8    +      +       +      +
    281K  THR*     3.9     1.2    +      -       -      +
----------------------------------------------------------
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Residues in contact with MET 278 (chain K). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    268K  SER*     6.1     3.6    -      -       -      +
    273K  LEU*     5.4     8.2    -      -       +      +
    275K  GLY*     2.6    27.0    +      -       -      +
    277K  TYR*     1.3    71.6    -      -       -      +
    279K  LEU*     1.3    60.5    +      -       +      +
    281K  THR*     2.6    41.2    +      -       +      +
    282K  MET*     2.8    54.3    +      -       +      +
    220O  PHE*     4.9    17.9    -      -       +      +
----------------------------------------------------------
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Residues in contact with LEU 279 (chain K). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    275K  GLY      3.5     5.4    +      -       -      +
    276K  LYS*     3.9    14.3    +      -       -      +
    277K  TYR      3.3     1.0    -      -       -      -
    278K  MET*     1.3    76.1    -      -       +      +
    280K  PHE*     1.3    71.5    +      -       +      +
    282K  MET*     3.0    52.9    +      -       +      +
    283K  ILE*     3.1    29.6    +      -       +      +
    284K  PHE*     4.6     1.0    -      -       -      -
----------------------------------------------------------
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Residues in contact with PHE 280 (chain K). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    137K  PHE*     6.6     0.2    -      +       -      -
    274K  ILE*     6.1     0.4    -      -       +      -
    276K  LYS*     2.7    22.7    -      -       +      -
    277K  TYR*     2.7    53.8    +      +       +      +
    279K  LEU*     1.3    79.0    -      -       +      +
    281K  THR*     1.3    59.4    +      -       -      +
    284K  PHE*     2.5    64.8    +      +       +      -
    427K  ALA*     5.8     9.9    -      -       +      -
    428K  GLY*     6.5     1.8    -      -       -      -
----------------------------------------------------------
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Residues in contact with THR 281 (chain K). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    261K  VAL*     5.9     2.6    -      -       -      +
    264K  ILE*     4.8    18.1    -      -       +      +
    277K  TYR      5.2     0.4    -      -       -      -
    278K  MET*     2.6    45.1    +      -       +      +
    280K  PHE*     1.3    79.0    -      -       -      +
    282K  MET*     1.3    75.8    +      -       -      +
    284K  PHE*     4.2     7.2    -      -       -      -
    285K  VAL*     2.6    40.1    +      -       +      +
----------------------------------------------------------
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Residues in contact with MET 282 (chain K). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    278K  MET*     2.8    57.6    +      -       +      +
    279K  LEU*     3.0    43.0    +      -       +      +
    281K  THR*     1.3    80.6    -      -       -      +
    283K  ILE*     1.3    59.5    +      -       -      +
    285K  VAL*     3.9     4.3    -      -       -      -
    286K  ILE*     2.8    43.9    +      -       +      +
    220O  PHE      5.2     5.4    -      -       -      +
    223O  ILE*     4.7    26.5    -      -       +      -
    224O  ASN*     5.8     1.1    -      -       -      +
----------------------------------------------------------
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Residues in contact with ILE 283 (chain K). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    279K  LEU*     3.1    26.7    +      -       +      +
    282K  MET*     1.3    77.5    -      -       -      +
    284K  PHE*     1.3    63.3    +      -       +      +
    286K  ILE*     4.3     5.8    -      -       +      -
    287K  SER*     2.6    40.7    +      -       -      +
    290K  ILE*     5.8     6.3    -      -       +      -
    420K  ILE*     6.4     2.7    -      -       +      -
----------------------------------------------------------
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Residues in contact with PHE 284 (chain K). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    225K  PHE*     5.1     6.5    -      -       -      -
    279K  LEU      4.6     1.3    -      -       -      -
    280K  PHE*     2.5    56.5    +      +       +      +
    281K  THR*     3.6     4.7    -      -       -      +
    283K  ILE*     1.3    88.0    -      -       +      +
    285K  VAL*     1.3    61.5    +      -       -      +
    287K  SER*     3.1    11.9    +      -       -      -
    288K  SER*     3.3     9.7    +      -       -      -
    420K  ILE*     5.5     7.8    -      -       +      +
    423K  VAL      5.4     0.4    -      -       -      -
    424K  SER*     3.0    54.3    -      -       -      -
----------------------------------------------------------
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Residues in contact with VAL 285 (chain K). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    225K  PHE*     5.8     2.5    -      -       -      -
    257K  LEU*     2.9    41.1    -      -       +      +
    260K  ILE*     6.2     1.1    -      -       +      -
    261K  VAL*     5.6     7.4    -      -       +      -
    281K  THR*     2.6    44.4    +      -       +      +
    282K  MET*     2.8     8.1    -      -       -      +
    284K  PHE*     1.3    74.3    -      -       -      +
    286K  ILE*     1.3    81.5    +      -       +      +
    288K  SER*     3.0    27.0    -      -       -      -
    289K  ILE*     3.2    12.1    +      -       +      +
----------------------------------------------------------
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Residues in contact with ILE 286 (chain K). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    282K  MET*     2.8    47.3    +      -       +      +
    283K  ILE*     3.4     5.2    -      -       +      +
    285K  VAL*     1.3    91.4    -      -       +      +
    287K  SER*     1.3    53.3    +      -       -      +
    289K  ILE*     2.6    28.6    -      -       +      +
    290K  ILE*     2.6    47.5    +      -       +      +
    223O  ILE*     5.0     7.4    -      -       +      +
    227O  ALA*     4.1    28.7    -      -       +      -
----------------------------------------------------------
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Residues in contact with SER 287 (chain K). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    283K  ILE*     2.6    27.1    +      -       -      -
    284K  PHE*     3.1     6.5    +      -       -      -
    286K  ILE*     1.3    68.7    -      -       -      +
    288K  SER*     1.3    56.0    +      -       -      +
    289K  ILE      2.7     5.2    -      -       -      -
    290K  ILE*     3.7    13.7    -      -       -      -
    291K  VAL*     2.6    59.5    +      -       -      +
    416K  LEU*     5.1     1.6    -      -       -      +
    420K  ILE*     4.0    27.1    -      -       -      +
----------------------------------------------------------
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Residues in contact with SER 288 (chain K). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    225K  PHE*     3.8    39.6    -      -       -      -
    229K  THR*     4.8     4.5    +      -       -      +
    253K  LEU*     4.4    14.0    -      -       -      +
    254K  THR*     5.1     0.7    +      -       -      -
    257K  LEU*     4.6     9.5    -      -       -      +
    284K  PHE      3.3     3.4    +      -       -      -
    285K  VAL*     3.0    19.7    +      -       -      -
    287K  SER*     1.3    77.4    -      -       -      +
    289K  ILE*     1.3    55.4    -      -       -      +
    291K  VAL*     4.3     3.1    -      -       -      +
    292K  THR*     2.4    40.9    +      -       -      +
----------------------------------------------------------
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Residues in contact with ILE 289 (chain K). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    254K  THR*     3.2    29.4    -      -       +      +
    257K  LEU*     5.7     3.8    -      -       +      -
    285K  VAL*     3.4    15.3    -      -       +      +
    286K  ILE*     2.6    32.8    -      -       +      +
    288K  SER*     1.3    80.9    -      -       -      +
    290K  ILE*     1.3    66.6    +      -       +      +
    292K  THR*     2.3    23.7    +      -       +      +
    293K  VAL*     3.2    14.8    +      -       +      +
    227O  ALA      5.2     2.0    -      -       -      +
    231O  LEU*     3.9    45.5    -      -       +      +
----------------------------------------------------------
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Residues in contact with ILE 290 (chain K). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    283K  ILE*     5.8     6.7    -      -       +      -
    286K  ILE*     2.6    39.7    +      -       +      +
    287K  SER*     3.7    12.6    -      -       -      -
    289K  ILE*     1.3    76.0    -      -       +      +
    291K  VAL*     1.3    59.9    +      -       +      +
    293K  VAL*     2.9    29.5    -      -       +      +
    294K  VAL*     3.1    10.4    +      -       -      +
----------------------------------------------------------
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Residues in contact with VAL 291 (chain K). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    229K  THR*     4.9     7.4    -      -       +      -
    233K  PHE*     4.4     9.4    -      -       +      -
    287K  SER*     2.6    48.6    +      -       -      +
    288K  SER*     4.3     3.1    -      -       -      +
    290K  ILE*     1.3    69.5    -      -       +      +
    292K  THR*     1.3    54.5    +      -       -      +
    294K  VAL*     2.9     8.1    -      -       +      +
    295K  VAL*     2.4    66.8    +      -       +      +
    413K  VAL*     3.9    23.6    -      -       +      -
    416K  LEU*     4.4    18.4    -      -       +      -
    417K  ILE*     6.2     0.2    -      -       +      -
    420K  ILE*     5.6     1.6    -      -       +      -
----------------------------------------------------------
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Residues in contact with THR 292 (chain K). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    229K  THR*     5.2    11.8    -      -       +      +
    232K  VAL*     5.8     0.2    -      -       -      -
    250K  LEU*     3.1    31.9    -      -       +      -
    253K  LEU*     5.4     7.0    -      -       +      -
    254K  THR*     5.8     2.5    -      -       -      +
    288K  SER*     2.4    29.9    +      -       -      +
    289K  ILE*     2.3    34.8    +      -       +      +
    291K  VAL*     1.3    76.3    -      -       -      +
    293K  VAL*     1.3    59.9    +      -       -      -
    295K  VAL*     4.1     1.6    -      -       -      -
    296K  ILE*     2.4    48.2    +      -       +      +
    231O  LEU*     5.7     1.6    -      -       -      +
----------------------------------------------------------
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Residues in contact with VAL 293 (chain K). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    289K  ILE*     3.5    11.4    -      -       +      +
    290K  ILE*     2.9    27.6    -      -       +      +
    292K  THR*     1.3    78.5    +      -       -      +
    294K  VAL*     1.3    56.5    +      -       +      +
    296K  ILE*     4.2     3.8    -      -       -      -
    297K  ASN*     2.6    40.8    +      -       -      +
    231O  LEU*     4.8     6.1    -      -       +      +
    234O  SER*     3.1    32.5    -      -       -      +
    235O  LEU      4.7     0.4    -      -       -      +
    238O  LEU*     3.5    30.5    -      -       +      +
----------------------------------------------------------
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Residues in contact with VAL 294 (chain K). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    290K  ILE      3.1     9.4    +      -       -      +
    291K  VAL*     2.9    18.2    +      -       +      +
    292K  THR      2.7     4.6    +      -       -      -
    293K  VAL*     1.3    81.1    -      -       +      +
    295K  VAL*     1.3    83.8    +      -       +      +
    297K  ASN*     3.7    10.9    -      -       -      +
    298K  THR*     2.5    51.2    +      -       -      +
    409K  ILE*     6.0     4.7    -      -       +      -
----------------------------------------------------------
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Residues in contact with VAL 295 (chain K). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    232K  VAL*     3.6    37.0    -      -       +      +
    233K  PHE*     4.7    16.4    -      -       +      -
    236K  PRO*     6.1     0.2    -      -       +      -
    291K  VAL*     2.4    63.6    +      -       +      +
    292K  THR      2.7     1.5    +      -       -      +
    294K  VAL*     1.3    79.4    -      -       +      +
    296K  ILE*     1.3    54.2    +      -       +      +
    298K  THR*     3.3     7.7    -      -       -      +
    299K  HIS*     2.4    39.6    +      -       +      +
    409K  ILE*     5.4    16.3    -      -       +      +
    413K  VAL*     4.9     5.6    -      -       +      -
----------------------------------------------------------
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Residues in contact with ILE 296 (chain K). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    232K  VAL*     4.4     5.6    -      -       +      -
    243K  MET      5.8     1.6    -      -       -      +
    246K  SER*     5.8     0.2    -      -       -      -
    250K  LEU*     3.1    49.8    -      -       +      -
    292K  THR*     2.4    69.4    +      -       +      +
    293K  VAL*     3.7     4.0    -      -       -      +
    295K  VAL*     1.3    74.4    -      -       +      +
    297K  ASN*     1.3    58.5    +      -       -      +
    298K  THR      3.1     1.1    -      -       -      -
    299K  HIS*     3.0    29.8    -      -       +      +
    300K  HIS*     2.8    45.5    +      -       +      +
    238O  LEU*     5.4     9.0    -      -       +      -
----------------------------------------------------------
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Residues in contact with ASN 297 (chain K). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    293K  VAL      2.6    23.7    +      -       -      +
    294K  VAL*     3.7    12.1    +      -       -      +
    296K  ILE*     1.3    77.0    -      -       -      +
    298K  THR*     1.3    54.3    +      -       -      +
    300K  HIS*     3.0    12.0    -      -       -      +
    301K  ARG*     2.4    30.9    +      -       -      +
    238O  LEU*     4.5    17.2    -      -       +      +
    242O  LEU*     5.9     1.6    -      -       +      -
    245O  GLN*     2.7    38.1    +      -       -      +
----------------------------------------------------------
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Residues in contact with THR 298 (chain K). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    294K  VAL*     2.5    33.6    +      -       -      +
    295K  VAL*     3.5     4.7    -      -       -      +
    297K  ASN*     1.3    73.5    +      -       -      +
    299K  HIS*     1.3    69.1    +      -       -      +
    300K  HIS      2.8     1.8    -      -       -      -
    301K  ARG*     2.7    65.2    +      -       -      +
    405K  VAL*     5.8     0.9    -      -       +      -
    409K  ILE*     4.2    27.4    -      -       +      -
----------------------------------------------------------
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Residues in contact with HIS 299 (chain K). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    232K  VAL*     3.4    29.0    +      -       +      +
    235K  LEU*     5.3     2.4    -      -       +      +
    236K  PRO*     3.5    30.6    -      -       +      +
    243K  MET*     4.2    35.3    +      -       +      +
    246K  SER*     4.7    10.4    -      -       -      -
    295K  VAL*     2.4    32.4    +      -       +      +
    296K  ILE*     3.0    36.3    -      -       +      +
    298K  THR*     1.3    69.4    -      -       -      +
    300K  HIS*     1.3    55.1    -      +       +      +
    301K  ARG*     4.5     4.6    +      -       -      +
    306K  HIS*     2.1    35.7    +      +       -      +
    406K  ILE*     6.0     2.5    -      -       -      -
    409K  ILE*     6.1     2.0    -      -       -      -
----------------------------------------------------------
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Residues in contact with HIS 300 (chain K). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    243K  MET*     5.1    12.8    +      -       +      +
    244K  THR      5.6     0.2    +      -       -      -
    247K  ILE*     5.3     5.1    -      -       +      +
    250K  LEU*     6.2     1.1    -      -       +      -
    296K  ILE*     2.8    29.2    +      -       +      +
    297K  ASN*     3.0    15.0    -      -       -      +
    299K  HIS*     1.3    78.0    +      -       +      +
    301K  ARG*     1.3    47.4    +      -       -      -
    302K  SER      2.5    20.0    +      -       -      -
    306K  HIS*     2.5    30.9    -      -       +      +
    238O  LEU*     5.6     6.6    -      -       +      +
    242O  LEU*     3.4    40.6    -      -       +      +
    245O  GLN*     3.3    25.2    -      -       +      +
    246O  ALA      4.9     1.3    -      -       -      +
    250O  LYS*     4.5    14.2    -      -       -      -
    253O  LEU*     3.8    23.1    -      -       +      +
----------------------------------------------------------
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Residues in contact with ARG 301 (chain K). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    297K  ASN*     2.4    19.9    +      -       -      +
    298K  THR*     2.7    59.8    +      -       -      +
    299K  HIS      4.5     4.0    +      -       -      +
    300K  HIS*     1.3    60.2    -      -       -      +
    302K  SER*     1.3    65.7    +      -       -      +
    303K  PRO*     4.1     4.5    -      -       -      +
    400K  LYS      5.3     0.4    +      -       -      -
    401K  TYR*     6.1     0.8    -      -       -      +
    402K  VAL*     4.6    16.6    +      -       -      +
    405K  VAL*     3.3    27.5    -      -       -      +
    406K  ILE*     3.0    38.1    -      -       -      +
    245O  GLN*     4.0    20.9    -      -       -      +
----------------------------------------------------------
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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