Contacts of the helix formed by residues 245 - 268 (chain A) in PDB entry 6J8H


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 LEU 245 (chain A).
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    241A  SER      3.6     9.4    +      -       -      +
    242A  VAL*     3.0    21.7    +      -       +      +
    244A  LYS*     1.3    78.0    -      -       -      +
    246A  SER*     1.3    62.8    +      -       -      +
    247A  ASP      3.4     1.1    -      -       -      -
    248A  VAL*     3.5    15.4    +      -       +      +
    249A  MET*     3.1    42.4    +      -       +      +
    397A  ILE*     4.5    15.0    -      -       +      +
    400A  VAL*     3.4    31.0    -      -       +      -
    401A  VAL*     4.2    25.1    -      -       +      -
    957A  LEU*     4.9    13.2    -      -       +      -
----------------------------------------------------------
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Residues in contact with SER 246 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    242A  VAL      3.9     1.8    +      -       -      -
    243A  LYS*     3.2    15.3    +      -       -      -
    244A  LYS      3.1     3.8    +      -       -      -
    245A  LEU*     1.3    77.9    -      -       -      +
    247A  ASP*     1.3    69.0    +      -       -      +
    249A  MET*     3.4     6.3    +      -       -      +
    250A  ILE*     3.3    30.4    +      -       -      +
----------------------------------------------------------
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Residues in contact with ASP 247 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    244A  LYS      4.2     5.3    +      -       -      +
    245A  LEU      3.4     0.4    -      -       -      -
    246A  SER*     1.3    81.8    +      -       -      +
    248A  VAL*     1.3    66.8    +      -       +      +
    250A  ILE*     3.2    11.2    +      -       -      +
    251A  LEU*     3.1    21.7    +      -       -      +
   1629A  GLY*     2.5    51.2    -      -       -      +
   1630A  ILE*     2.8    10.2    +      -       -      +
   1633A  LEU*     4.2     9.7    -      -       +      +
----------------------------------------------------------
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Residues in contact with VAL 248 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    244A  LYS      5.2     0.9    +      -       -      +
    245A  LEU*     3.5    14.5    +      -       +      +
    246A  SER      3.4     0.4    -      -       -      -
    247A  ASP*     1.3    77.8    -      -       +      +
    249A  MET*     1.3    57.0    +      -       -      +
    251A  LEU*     3.4     2.2    +      -       +      +
    252A  THR*     2.7    44.1    +      -       -      +
    393A  LEU*     5.1     2.2    -      -       +      +
    396A  LEU*     4.5    12.6    -      -       +      +
    397A  ILE*     3.6    34.1    -      -       +      +
    400A  VAL*     3.4    39.0    -      -       +      -
   1633A  LEU*     3.9    21.1    -      -       +      -
----------------------------------------------------------
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Residues in contact with MET 249 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    245A  LEU*     3.1    43.8    +      -       +      +
    246A  SER*     3.6     7.6    -      -       -      +
    247A  ASP      3.2     0.2    -      -       -      -
    248A  VAL*     1.3    84.8    -      -       -      +
    250A  ILE*     1.3    62.4    +      -       +      +
    252A  THR*     3.3    17.3    +      -       +      +
    253A  VAL*     3.0    31.3    +      -       +      +
    397A  ILE*     4.9    14.1    -      -       +      -
    953A  VAL*     6.2     3.8    -      -       +      -
----------------------------------------------------------
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Residues in contact with ILE 250 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    246A  SER*     3.3    17.4    +      -       -      +
    247A  ASP*     3.2    14.8    +      -       -      +
    249A  MET*     1.3    79.2    -      -       +      +
    251A  LEU*     1.3    62.5    +      -       -      +
    253A  VAL*     3.4     5.0    +      -       -      +
    254A  PHE*     3.0    22.3    +      -       +      +
   1630A  ILE*     3.0    31.2    -      -       +      -
----------------------------------------------------------
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Residues in contact with LEU 251 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    247A  ASP      3.1    12.9    +      -       -      +
    248A  VAL*     3.8     7.0    -      -       +      +
    250A  ILE*     1.3    76.8    -      -       -      +
    252A  THR*     1.3    58.2    +      -       -      +
    254A  PHE*     3.3    12.1    +      -       +      -
    255A  CYS*     2.7    37.9    +      -       -      +
    392A  TYR*     4.9     2.9    -      -       +      -
    393A  LEU*     4.3    16.2    -      -       +      -
    396A  LEU*     3.9    27.8    -      -       +      -
   1630A  ILE*     3.3    34.7    -      -       +      +
   1633A  LEU*     3.9    20.2    -      -       +      -
   1634A  LEU*     3.8    22.7    -      -       +      -
----------------------------------------------------------
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Residues in contact with THR 252 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    248A  VAL*     2.7    32.5    +      -       -      +
    249A  MET*     3.7    19.4    -      -       +      +
    250A  ILE      3.3     0.2    -      -       -      -
    251A  LEU*     1.3    78.3    -      -       -      +
    253A  VAL*     1.3    60.1    +      -       +      +
    255A  CYS*     3.8     0.7    -      -       -      +
    256A  LEU*     2.9    47.7    +      -       +      +
    355A  PHE*     6.4     0.4    -      -       +      -
    358A  MET*     4.7    12.8    -      -       +      -
    393A  LEU*     4.2    25.1    +      -       +      +
    397A  ILE*     4.8     6.8    -      -       +      +
----------------------------------------------------------
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Residues in contact with VAL 253 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    249A  MET*     3.0    19.3    +      -       +      +
    250A  ILE*     3.9     5.6    -      -       -      +
    252A  THR*     1.3    79.0    -      -       +      +
    254A  PHE*     1.3    57.7    +      -       -      +
    256A  LEU*     3.9     4.9    -      -       -      +
    257A  SER*     2.9    41.3    +      -       -      +
    351A  PHE*     4.4    15.1    -      -       +      -
----------------------------------------------------------
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Residues in contact with PHE 254 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    250A  ILE*     3.0    17.8    +      -       +      +
    251A  LEU*     3.6    20.2    -      -       +      +
    253A  VAL*     1.3    78.2    -      -       -      +
    255A  CYS*     1.3    60.8    +      -       -      +
    257A  SER*     3.2     5.3    +      -       -      -
    258A  VAL*     2.9    55.7    +      -       +      +
   1529A  MET*     4.7     9.9    -      -       +      -
   1620A  ILE*     3.9    32.3    -      -       +      -
   1621A  LEU*     4.6     7.2    -      -       +      -
   1623A  LEU*     4.4    17.7    -      -       +      -
   1624A  VAL*     3.6    31.4    -      -       +      -
   1630A  ILE*     4.7    11.7    -      -       +      -
   1634A  LEU*     5.7     1.3    -      -       +      -
----------------------------------------------------------
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Residues in contact with CYS 255 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    251A  LEU*     2.7    35.6    +      -       -      +
    252A  THR      3.8     3.4    -      -       -      +
    254A  PHE*     1.3    75.1    -      -       -      +
    256A  LEU*     1.3    65.4    +      -       -      +
    258A  VAL*     3.4     5.8    +      -       -      +
    259A  PHE*     3.0    47.0    +      -       +      -
    388A  LEU*     4.6    12.8    -      -       -      -
    392A  TYR*     6.4     0.7    -      -       -      -
    393A  LEU*     3.9    26.2    -      -       +      -
   1634A  LEU*     5.9     2.9    -      -       -      -
----------------------------------------------------------
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Residues in contact with LEU 256 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    252A  THR*     2.9    34.8    +      -       +      +
    253A  VAL*     3.9     1.1    -      -       -      +
    255A  CYS*     1.3    77.5    -      -       +      +
    257A  SER*     1.3    59.0    +      -       -      +
    259A  PHE*     3.9     6.4    -      -       +      +
    260A  ALA*     2.9    29.3    +      -       -      +
    351A  PHE*     3.9    31.3    -      -       +      -
    354A  LEU*     4.3    23.2    -      -       +      +
    355A  PHE*     4.0    33.0    -      -       +      +
    358A  MET*     4.1    26.5    -      -       +      -
    389A  GLY*     5.6     1.8    -      -       -      +
    393A  LEU*     4.6     8.5    -      -       +      -
----------------------------------------------------------
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Residues in contact with SER 257 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    253A  VAL*     2.9    27.8    +      -       -      +
    254A  PHE*     3.3     8.3    -      -       -      -
    255A  CYS      3.1     0.2    -      -       -      -
    256A  LEU*     1.3    75.5    -      -       -      +
    258A  VAL*     1.3    64.3    +      -       -      +
    260A  ALA*     3.3     7.7    +      -       -      +
    261A  LEU*     3.0    28.2    +      -       -      +
    347A  PHE*     3.9    19.1    -      -       -      -
    351A  PHE*     4.1     8.0    -      -       -      -
   1529A  MET*     3.8    21.8    -      -       -      +
   1533A  MET*     4.8     1.4    -      -       -      +
----------------------------------------------------------
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Residues in contact with VAL 258 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    254A  PHE*     2.9    51.8    +      -       +      +
    255A  CYS*     3.4     6.5    +      -       -      +
    257A  SER*     1.3    75.5    -      -       -      +
    259A  PHE*     1.3    69.1    +      -       +      +
    261A  LEU*     3.2    10.8    +      -       -      +
    262A  ILE*     3.0    30.8    +      -       +      +
   1529A  MET*     5.2     0.4    -      -       +      -
   1617A  ILE*     3.9    25.4    -      -       +      -
   1620A  ILE*     4.4    11.0    -      -       +      -
   1621A  LEU*     4.3    11.2    -      -       +      -
----------------------------------------------------------
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Residues in contact with PHE 259 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    255A  CYS*     3.0    35.0    +      -       +      +
    256A  LEU*     4.0     3.1    -      -       +      +
    258A  VAL*     1.3    79.1    -      -       +      +
    260A  ALA*     1.3    54.7    +      -       -      +
    262A  ILE*     3.2    19.2    +      -       +      +
    263A  GLY*     2.7    33.6    +      -       -      -
    354A  LEU*     3.0    34.6    -      -       +      +
    381A  PHE*     4.4     4.9    -      +       +      -
    384A  VAL*     4.8    14.4    -      -       +      -
    385A  VAL*     3.9    32.8    -      -       +      -
    388A  LEU*     4.2    30.1    -      -       +      -
    389A  GLY*     4.3    12.8    -      -       -      -
    393A  LEU*     6.4     0.2    -      -       +      -
----------------------------------------------------------
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Residues in contact with ALA 260 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    256A  LEU      2.9    19.5    +      -       -      +
    257A  SER*     3.4     7.2    -      -       -      +
    259A  PHE*     1.3    77.3    -      -       -      +
    261A  LEU*     1.3    56.4    +      -       -      +
    263A  GLY*     3.8     0.2    -      -       -      -
    264A  LEU*     2.9    31.8    +      -       -      +
    347A  PHE*     3.7    22.8    -      -       +      -
    350A  ALA*     4.0     7.6    -      -       +      +
    351A  PHE*     4.4    22.9    -      -       +      +
    354A  LEU*     4.1    11.0    -      -       +      +
----------------------------------------------------------
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Residues in contact with LEU 261 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    257A  SER      3.0    18.3    +      -       -      +
    258A  VAL*     3.2    11.4    +      -       -      +
    260A  ALA*     1.3    74.1    -      -       -      +
    262A  ILE*     1.3    64.2    +      -       -      +
    264A  LEU*     3.5     9.3    +      -       +      +
    265A  GLN*     3.1    24.6    +      -       -      +
    347A  PHE*     4.3    17.9    -      -       +      -
   1529A  MET*     4.2    29.2    -      -       +      -
   1532A  MET*     3.7    44.2    -      -       +      +
   1533A  MET*     4.2     5.4    -      -       +      +
   1617A  ILE*     4.0    14.8    -      -       +      +
   1620A  ILE*     4.7    15.3    -      -       +      -
----------------------------------------------------------
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Residues in contact with ILE 262 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    258A  VAL*     3.0    24.8    +      -       +      +
    259A  PHE*     3.7    22.4    -      -       +      +
    261A  LEU*     1.3    75.8    -      -       -      +
    263A  GLY*     1.3    62.6    +      -       -      +
    265A  GLN*     4.0     0.9    -      -       -      +
    266A  LEU*     3.1    30.7    +      -       +      +
    381A  PHE*     4.1    17.7    -      -       +      -
   1614A  LEU*     4.3    24.5    -      -       +      +
   1617A  ILE*     2.9    33.7    -      -       +      -
----------------------------------------------------------
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Residues in contact with GLY 263 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    259A  PHE      2.7    20.7    +      -       -      -
    260A  ALA      3.8     1.1    -      -       -      -
    262A  ILE*     1.3    74.5    -      -       -      +
    264A  LEU*     1.3    55.4    +      -       -      +
    267A  PHE*     2.9    48.0    +      -       -      +
    344A  PHE*     3.9    15.8    -      -       -      -
    381A  PHE*     4.1    12.8    -      -       -      -
----------------------------------------------------------
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Residues in contact with LEU 264 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    260A  ALA      2.9    17.5    +      -       -      +
    261A  LEU*     3.8    14.4    -      -       +      +
    262A  ILE      3.3     0.2    -      -       -      -
    263A  GLY*     1.3    75.6    -      -       -      +
    265A  GLN*     1.3    63.5    +      -       -      +
    268A  MET*     2.9    49.6    +      -       +      +
    344A  PHE*     3.3    29.2    -      -       -      +
    345A  ASP      3.4    20.6    -      -       -      +
    346A  THR*     4.3     5.2    -      -       -      +
    347A  PHE*     4.6    16.6    -      -       +      +
    350A  ALA*     4.5     5.6    -      -       +      -
   1532A  MET      4.3    14.6    -      -       -      +
   1535A  GLU*     4.0    23.3    -      -       +      +
----------------------------------------------------------
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Residues in contact with GLN 265 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    261A  LEU      3.1    17.8    +      -       -      +
    262A  ILE      4.0     0.2    -      -       -      +
    264A  LEU*     1.3    80.7    -      -       -      +
    266A  LEU*     1.3    63.4    +      -       -      +
    268A  MET*     4.3    16.2    +      -       -      +
   1535A  GLU*     6.0     0.2    -      -       -      -
   1610A  ARG*     3.9    29.5    -      -       -      +
   1613A  ARG*     3.1    57.9    +      -       -      +
   1614A  LEU*     3.4    29.2    -      -       +      -
   1616A  ARG*     4.2    10.5    +      -       -      +
   1617A  ILE*     5.9     1.1    -      -       +      -
----------------------------------------------------------
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Residues in contact with LEU 266 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    262A  ILE*     3.1    28.7    +      -       +      +
    263A  GLY      4.1     1.3    -      -       -      +
    265A  GLN*     1.3    81.0    -      -       -      +
    267A  PHE*     1.3    77.7    +      -       +      +
    268A  MET      3.8     0.2    -      -       -      -
    270A  ASN*     4.5     0.5    +      -       -      -
    378A  TYR*     3.9    32.3    -      -       +      -
    381A  PHE*     4.5    11.2    -      -       +      -
   1610A  ARG*     2.3    40.1    +      -       +      +
   1611A  VAL*     4.6    21.1    -      -       +      +
   1614A  LEU*     3.9    29.8    -      -       +      -
----------------------------------------------------------
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Residues in contact with PHE 267 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    263A  GLY*     2.9    33.3    +      -       -      +
    266A  LEU*     1.3    86.4    -      -       +      +
    268A  MET*     1.3    64.8    +      -       -      +
    269A  GLY      3.3     0.5    +      -       -      -
    270A  ASN*     3.2    37.5    +      -       +      +
    271A  LEU*     4.7     1.5    +      -       +      +
    344A  PHE*     3.8    36.6    -      +       +      +
    370A  THR*     4.3    18.4    -      -       -      -
    374A  ALA*     3.9    11.2    -      -       +      -
    378A  TYR*     3.8    43.1    -      +       +      -
    381A  PHE*     3.4    42.8    -      +       +      -
    382A  PHE*     4.7     0.9    -      +       -      -
   1610A  ARG*     5.5     0.2    -      -       -      -
----------------------------------------------------------
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Residues in contact with MET 268 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    264A  LEU*     2.9    47.2    +      -       +      +
    265A  GLN*     4.3    17.2    +      -       -      +
    266A  LEU      3.8     1.4    -      -       -      -
    267A  PHE*     1.3    75.9    -      -       -      +
    269A  GLY*     1.3    57.5    +      -       -      +
    270A  ASN*     3.2     7.2    +      -       -      +
    332A  LYS*     5.3     1.0    +      -       -      -
    344A  PHE      3.9    17.9    -      -       -      +
    345A  ASP*     4.7     0.2    -      -       -      -
   1535A  GLU*     4.9    17.7    -      -       +      +
   1536A  LYS      4.0     4.7    -      -       -      +
   1537A  GLU*     3.9    37.0    -      -       +      +
   1539A  GLN*     6.3     0.9    -      -       -      +
   1613A  ARG*     5.9     2.5    -      -       -      +
----------------------------------------------------------
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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