Contacts of the helix formed by residues 164 - 185 (chain F) in PDB entry 1Z6Z


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 TRP 164 (chain F).
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    180E  VAL*     4.4     0.2    -      -       -      -
    101F  LEU*     4.8     6.3    -      -       +      -
    104F  VAL*     3.6    22.7    -      -       +      +
    156F  CYS*     3.5    31.6    -      -       -      -
    161F  PHE*     3.0    31.2    +      +       +      +
    162F  LYS      3.5    11.7    +      -       -      -
    163F  GLY*     1.3    85.7    -      -       -      +
    165F  ALA*     1.3    58.5    +      -       -      +
    166F  LEU      3.4     2.2    -      -       -      -
    167F  TYR*     3.3    16.9    +      +       +      -
    168F  CYS*     2.9    35.0    +      -       -      +
    203F  GLN*     5.9     3.4    -      -       -      -
    206F  ALA*     3.7    28.7    -      -       +      -
    210F  SER*     3.1    24.3    +      -       -      -
    211F  VAL      6.2     0.2    -      -       -      -
    215F  MET*     5.5     7.4    -      -       +      +
    219F  LEU*     4.1    19.3    -      -       +      -
    411F   CL      4.4    10.3    -      -       +      -
----------------------------------------------------------
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Residues in contact with ALA 165 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    177E  LEU*     3.7    16.0    -      -       +      +
    180E  VAL*     3.9    22.7    -      -       +      +
    184E  GLU*     4.9     2.9    -      -       -      +
    108F  PHE*     3.9    29.2    -      -       +      -
    111F  LEU*     4.0    14.6    -      -       +      -
    163F  GLY      3.5     4.4    +      -       -      -
    164F  TRP*     1.3    76.2    -      -       -      +
    166F  LEU*     1.3    63.4    +      -       -      +
    168F  CYS*     3.5     1.0    +      -       -      +
    169F  ALA*     3.0    26.9    +      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 166 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    129E  LEU*     3.7    25.1    -      -       +      -
    177E  LEU*     5.0     0.2    -      -       +      -
    101F  LEU      4.9     3.1    -      -       -      +
    102F  GLY*     5.2     6.7    -      -       -      -
    103F  ASP      5.3     4.0    -      -       -      +
    111F  LEU*     4.1    26.6    -      -       +      +
    116F  GLN*     4.9     7.2    -      -       -      +
    117F  VAL*     4.2    16.8    -      -       +      -
    120F  TYR*     3.3    47.3    -      -       +      -
    121F  TRP*     3.7    29.7    -      -       +      -
    164F  TRP      3.4     0.2    -      -       -      -
    165F  ALA*     1.3    78.2    -      -       -      +
    167F  TYR*     1.3    57.7    +      -       -      +
    169F  ALA*     3.9     1.0    -      -       -      +
    170F  GLY      2.9    24.6    +      -       -      -
----------------------------------------------------------
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Residues in contact with TYR 167 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    100F  SER      3.5    23.1    -      -       -      -
    101F  LEU*     3.7    33.4    +      -       +      +
    104F  VAL*     5.6     0.2    -      -       +      -
    120F  TYR*     3.3     9.1    +      -       -      -
    124F  ASN*     5.8     0.2    -      -       -      -
    154F  SER*     3.8     2.9    -      -       -      -
    156F  CYS*     3.5    37.7    -      -       +      -
    164F  TRP*     3.3    16.4    +      +       +      +
    166F  LEU*     1.3    79.1    -      -       -      +
    168F  CYS*     1.3    61.6    +      -       -      +
    170F  GLY*     3.3     1.6    +      -       -      -
    171F  LYS*     3.0    40.6    +      -       +      +
    202F  MET*     4.1    12.2    -      -       -      -
    411F   CL      3.2    25.0    -      -       +      +
    806F  NAP      2.7    41.2    +      -       -      -
----------------------------------------------------------
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Residues in contact with CYS 168 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    176E  MET*     3.6    17.7    -      -       +      -
    180E  VAL*     4.0     6.1    -      -       +      -
    156F  CYS*     3.5    33.5    -      -       -      +
    159F  GLN      3.6    22.4    -      -       -      -
    160F  PRO*     4.1     0.9    -      -       -      -
    161F  PHE*     3.8    18.2    -      -       -      -
    164F  TRP*     2.9    32.4    +      -       -      +
    165F  ALA      4.0     2.5    -      -       -      +
    167F  TYR*     1.3    72.4    -      -       -      +
    169F  ALA*     1.3    57.8    +      -       -      +
    171F  LYS      3.3     1.2    +      -       -      -
    172F  ALA*     2.9    30.0    +      -       -      +
----------------------------------------------------------
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Residues in contact with ALA 169 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    173E  ALA*     3.5    18.4    -      -       +      +
    176E  MET*     3.7    12.6    -      -       -      +
    177E  LEU*     3.7    28.3    -      -       +      +
    121F  TRP*     3.9    12.3    -      -       +      -
    165F  ALA      3.0    18.9    +      -       -      +
    166F  LEU      3.9     2.7    -      -       -      +
    168F  CYS*     1.3    76.0    -      -       -      +
    170F  GLY*     1.3    57.6    +      -       -      +
    172F  ALA*     3.8     0.7    -      -       -      +
    173F  ALA*     3.0    29.8    +      -       -      +
----------------------------------------------------------
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Residues in contact with GLY 170 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    120F  TYR*     4.8     6.5    -      -       -      -
    121F  TRP*     4.0    10.2    -      -       -      -
    124F  ASN*     5.3     2.9    -      -       -      -
    125F  LEU*     3.5    15.5    -      -       -      +
    166F  LEU      2.9    17.8    +      -       -      -
    167F  TYR      3.8     1.1    -      -       -      -
    169F  ALA*     1.3    73.1    -      -       -      +
    171F  LYS*     1.3    61.0    +      -       -      +
    173F  ALA*     3.3     0.9    +      -       -      -
    174F  ARG*     2.9    39.5    +      -       -      +
----------------------------------------------------------
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Residues in contact with LYS 171 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     99F  GLY*     5.4     2.6    -      -       -      -
    124F  ASN*     5.6     2.5    +      -       -      -
    151F  ASN*     5.9     0.2    -      -       -      +
    152F  ILE      2.9    26.8    +      -       -      +
    153F  SER*     4.2    13.2    -      -       -      -
    154F  SER*     4.0    12.1    -      -       -      -
    156F  CYS*     4.2     0.9    -      -       +      -
    157F  ALA*     3.6    26.8    -      -       +      +
    167F  TYR*     3.0    41.1    +      -       +      +
    168F  CYS      3.8     1.6    -      -       -      +
    170F  GLY*     1.3    74.2    -      -       -      +
    172F  ALA*     1.3    65.3    +      -       -      +
    174F  ARG*     3.3    25.5    +      -       +      +
    175F  ASP*     3.0    26.2    +      -       -      +
    806F  NAP      3.0    39.1    +      -       -      -
----------------------------------------------------------
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Residues in contact with ALA 172 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    172E  ALA*     4.2    17.0    -      -       +      +
    176E  MET*     4.0    20.9    -      -       +      -
    157F  ALA*     3.6    24.6    -      -       -      +
    168F  CYS      2.9    17.8    +      -       -      +
    169F  ALA      3.8     4.3    -      -       -      +
    171F  LYS*     1.3    75.6    -      -       -      +
    173F  ALA*     1.3    63.1    +      -       -      +
    175F  ASP*     3.5     3.5    +      -       -      +
    176F  MET*     3.1    23.4    +      -       -      +
----------------------------------------------------------
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Residues in contact with ALA 173 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    121E  TRP*     5.5     0.2    -      -       +      -
    169E  ALA*     3.7    33.0    -      -       +      +
    173E  ALA*     4.1     6.7    -      -       +      +
    125F  LEU*     3.5    27.8    -      -       +      -
    169F  ALA      3.0    18.1    +      -       -      +
    172F  ALA*     1.3    75.2    -      -       -      +
    174F  ARG*     1.3    60.1    +      -       -      +
    176F  MET*     3.1     2.3    +      -       -      +
    177F  LEU*     2.8    34.5    +      -       -      +
----------------------------------------------------------
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Residues in contact with ARG 174 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     96F  ASN*     3.2    24.9    +      -       -      +
     98F  ALA      3.8    22.1    +      -       -      -
    123F  LEU      5.1     0.6    +      -       -      -
    124F  ASN*     2.8    40.8    +      -       -      +
    125F  LEU*     3.9     5.4    -      -       +      -
    128F  MET*     3.6    32.1    -      -       +      +
    151F  ASN*     2.9    39.0    +      -       -      +
    152F  ILE      3.5     7.7    +      -       -      -
    170F  GLY      2.9    25.4    +      -       -      +
    171F  LYS*     3.3    28.0    +      -       +      +
    173F  ALA*     1.3    75.5    -      -       -      +
    175F  ASP*     1.3    63.6    +      -       -      +
    177F  LEU*     3.4    10.1    +      -       -      +
    178F  PHE*     3.1    26.3    +      -       -      +
    806F  NAP      4.5     1.4    +      -       -      -
----------------------------------------------------------
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Residues in contact with ASP 175 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    151F  ASN*     3.0    15.4    +      -       -      -
    153F  SER*     2.7    23.2    +      -       -      -
    157F  ALA*     3.8    10.4    -      -       +      +
    158F  LEU*     4.7     4.8    -      -       +      +
    171F  LYS      3.0    13.6    +      -       -      +
    172F  ALA*     3.8     4.9    -      -       -      +
    174F  ARG*     1.3    77.0    -      -       -      +
    176F  MET*     1.3    56.6    +      -       -      +
    178F  PHE      3.4     0.3    +      -       -      -
    179F  GLN*     2.9    39.9    +      -       -      +
    192F  ASN*     3.3    21.8    +      -       -      +
    252F  HIS*     2.7    33.3    +      -       -      +
----------------------------------------------------------
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Residues in contact with MET 176 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    156E  CYS      3.9     5.8    -      -       -      +
    157E  ALA      3.7    23.3    -      -       -      +
    158E  LEU      3.8    22.7    -      -       -      +
    159E  GLN      4.0     1.3    -      -       -      +
    160E  PRO*     3.9    31.2    -      -       +      -
    168E  CYS*     3.6    35.2    -      -       +      +
    169E  ALA*     3.7     2.9    -      -       -      +
    172E  ALA*     4.0     9.6    -      -       +      -
    172F  ALA      3.1    17.9    +      -       -      +
    173F  ALA      3.1     3.5    +      -       -      +
    175F  ASP*     1.3    73.9    -      -       -      +
    177F  LEU*     1.3    63.9    +      -       -      +
    179F  GLN*     3.2    17.4    +      -       -      +
    180F  VAL*     3.0    23.4    +      -       +      +
----------------------------------------------------------
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Residues in contact with LEU 177 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    108E  PHE*     3.6    15.1    -      -       +      -
    121E  TRP*     4.8     7.4    -      -       +      -
    165E  ALA*     3.8    35.0    -      -       +      +
    166E  LEU      4.7     0.2    -      -       -      +
    169E  ALA*     3.8    12.5    -      -       +      +
    125F  LEU*     4.6    12.3    -      -       +      +
    128F  MET*     4.1    22.9    -      -       -      -
    129F  LEU*     4.1    37.0    -      -       +      -
    173F  ALA      2.8    20.9    +      -       -      +
    174F  ARG*     3.6     8.1    -      -       -      +
    176F  MET*     1.3    74.4    -      -       -      +
    178F  PHE*     1.3    64.6    +      -       +      +
    180F  VAL*     3.1     9.1    +      -       -      +
    181F  LEU      2.9    23.2    +      -       -      -
----------------------------------------------------------
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Residues in contact with PHE 178 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    108E  PHE*     4.7     4.9    -      +       -      -
     96F  ASN*     3.4    24.0    -      -       -      -
    128F  MET*     3.7    21.8    -      -       +      -
    132F  THR*     3.6    28.3    -      -       +      -
    149F  VAL*     3.7    15.5    -      -       +      -
    150F  VAL      3.7     5.8    -      -       -      -
    151F  ASN*     3.6    34.1    -      -       +      -
    174F  ARG      3.1    11.5    +      -       -      +
    175F  ASP      3.9     0.2    -      -       -      +
    177F  LEU*     1.3    82.2    -      -       +      +
    179F  GLN*     1.3    61.2    +      -       -      +
    181F  LEU*     3.7     8.6    -      -       +      +
    182F  ALA*     3.0    24.3    +      -       -      +
    190F  VAL*     3.3    31.9    -      -       +      +
    191F  LEU      4.1     1.8    -      -       -      -
    192F  ASN*     3.4    21.8    -      -       -      +
----------------------------------------------------------
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Residues in contact with GLN 179 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    158E  LEU      5.1     2.5    +      -       -      +
    160E  PRO*     4.0    28.2    -      -       +      +
    175F  ASP*     2.9    31.9    +      -       -      +
    176F  MET*     3.2    25.2    +      -       -      +
    178F  PHE*     1.3    76.1    -      -       -      +
    180F  VAL*     1.3    62.0    +      -       -      +
    182F  ALA*     3.5     8.2    +      -       -      +
    183F  LEU*     3.4    23.7    +      -       -      +
    192F  ASN*     4.4     1.7    -      -       -      +
    250F  GLY*     3.6    22.7    -      -       -      +
----------------------------------------------------------
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Residues in contact with VAL 180 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    108E  PHE*     4.9     0.4    -      -       +      -
    160E  PRO*     3.8    24.7    -      -       +      -
    161E  PHE      3.7    20.4    -      -       -      +
    163E  GLY      4.4     0.4    -      -       -      +
    165E  ALA*     3.9    32.3    -      -       +      +
    168E  CYS*     4.2    13.9    -      -       +      -
    176F  MET*     3.0    18.8    +      -       -      +
    177F  LEU*     3.1     7.4    +      -       -      +
    179F  GLN*     1.3    74.1    -      -       -      +
    181F  LEU*     1.3    65.6    +      -       -      +
    183F  LEU*     3.0     8.2    +      -       -      +
    184F  GLU*     3.0    41.5    +      -       +      +
----------------------------------------------------------
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Residues in contact with LEU 181 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    108E  PHE*     3.7    37.2    -      -       +      -
    109E  VAL*     5.4     1.1    -      -       +      -
    132F  THR*     3.9    20.4    -      -       +      -
    136F  LEU*     3.9    15.0    -      -       +      -
    149F  VAL*     3.7    29.6    -      -       +      -
    177F  LEU      2.9    14.0    +      -       -      +
    178F  PHE*     3.7    13.2    -      -       +      +
    179F  GLN      3.4     0.2    -      -       -      -
    180F  VAL*     1.3    76.6    -      -       -      +
    182F  ALA*     1.3    57.6    +      -       -      +
    184F  GLU*     3.1     4.3    +      -       +      -
    185F  GLU*     2.8    53.6    +      -       +      +
    188F  VAL*     4.9     0.9    -      -       +      -
    190F  VAL*     4.0     8.7    -      -       +      -
----------------------------------------------------------
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Residues in contact with ALA 182 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    178F  PHE      3.0    17.4    +      -       -      +
    179F  GLN      3.7     5.2    -      -       -      +
    180F  VAL      3.3     0.2    -      -       -      -
    181F  LEU*     1.3    75.4    -      -       -      +
    183F  LEU*     1.3    62.2    -      -       +      +
    185F  GLU      3.9    14.6    -      -       -      +
    186F  PRO*     4.0     6.9    -      -       -      +
    190F  VAL*     3.8    11.4    -      -       +      +
    249F  SER*     3.7    22.8    +      -       -      +
    250F  GLY*     3.7    26.2    -      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 183 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    160E  PRO*     3.8    41.7    -      -       +      +
    161E  PHE*     4.5     7.6    -      -       +      +
    162E  LYS*     3.9    37.5    -      -       +      +
    179F  GLN      3.4     8.4    +      -       -      +
    180F  VAL*     3.0     9.4    +      -       -      +
    182F  ALA*     1.3    79.2    -      -       +      +
    184F  GLU*     1.3    61.9    +      -       -      +
    186F  PRO*     4.1    11.4    -      -       -      +
----------------------------------------------------------
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Residues in contact with GLU 184 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    107E  GLY*     3.5     8.5    -      -       -      -
    108E  PHE*     2.9    40.7    +      -       +      +
    109E  VAL      4.8     0.3    +      -       -      -
    162E  LYS*     4.0    17.4    -      -       +      -
    163E  GLY*     3.1    36.8    +      -       -      +
    165E  ALA*     4.9     1.0    -      -       -      +
    180F  VAL*     3.0    25.9    +      -       -      +
    181F  LEU*     3.1     5.8    +      -       -      +
    183F  LEU*     1.3    77.5    -      -       -      +
    185F  GLU*     1.3    75.6    +      -       +      +
    186F  PRO*     3.3     8.2    -      -       -      +
----------------------------------------------------------
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Residues in contact with GLU 185 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    108E  PHE*     5.9     0.4    -      -       +      -
    109E  VAL*     4.0    24.3    -      -       +      +
    136F  LEU*     5.3     0.7    -      -       +      -
    147F  ARG*     3.9    18.2    +      -       -      -
    181F  LEU*     2.8    31.7    +      -       +      +
    182F  ALA*     3.9     5.9    -      -       -      +
    184F  GLU*     1.3    90.6    -      -       +      +
    186F  PRO*     1.3    60.7    -      -       -      +
    187F  ASN*     3.1     5.1    -      -       -      +
    188F  VAL*     2.8    43.7    +      -       +      +
----------------------------------------------------------
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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