Contacts of the helix formed by residues 178 - 205 (chain A) in PDB entry 5L04


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 THR 178 (chain A).
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    176A  PRO*     3.4     8.5    -      -       -      +
    177A  LYS*     1.3    87.2    -      -       +      +
    179A  GLU*     1.3    58.3    +      -       -      +
    180A  GLN*     2.9    14.9    +      -       -      +
    181A  ASP*     2.8    23.4    +      -       +      +
    182A  GLY      2.9    23.9    +      -       -      -
----------------------------------------------------------
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Residues in contact with GLU 179 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    176A  PRO*     5.6     0.4    -      -       -      -
    178A  THR*     1.3    72.7    -      -       -      +
    180A  GLN*     1.3    62.1    +      -       -      +
    182A  GLY*     3.5     3.3    +      -       -      +
    183A  HIS*     3.1    51.6    +      -       +      +
----------------------------------------------------------
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Residues in contact with GLN 180 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    178A  THR*     2.9    14.3    +      -       -      +
    179A  GLU*     1.3    75.3    -      -       -      +
    181A  ASP*     1.3    61.6    +      -       -      +
    183A  HIS*     3.7     6.3    +      -       -      +
    184A  ASP*     3.1    23.1    +      -       -      +
----------------------------------------------------------
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Residues in contact with ASP 181 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    174A  ARG*     3.3    27.9    +      -       -      -
    175A  ASP      4.4     1.4    -      -       -      +
    176A  PRO*     3.9     3.1    -      -       -      +
    177A  LYS*     3.1    37.8    +      -       +      +
    178A  THR*     2.8    29.9    +      -       +      +
    180A  GLN*     1.3    71.8    -      -       -      +
    182A  GLY*     1.3    54.9    +      -       -      +
    184A  ASP*     2.8    30.5    +      -       -      +
    185A  ILE*     2.8    23.8    +      -       -      +
----------------------------------------------------------
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Residues in contact with GLY 182 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    176A  PRO*     3.5    23.3    -      -       -      +
    178A  THR      2.9    11.0    +      -       -      -
    179A  GLU*     3.7     5.6    -      -       -      -
    181A  ASP*     1.3    74.3    -      -       -      +
    183A  HIS*     1.3    63.9    +      -       -      +
    185A  ILE*     3.5     6.1    +      -       -      +
    186A  GLU*     3.2    28.9    +      -       -      +
----------------------------------------------------------
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Residues in contact with HIS 183 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    179A  GLU*     3.1    47.5    +      -       +      +
    180A  GLN*     4.1     6.3    -      -       -      +
    182A  GLY*     1.3    74.7    -      -       -      +
    184A  ASP*     1.3    57.7    +      -       -      +
    186A  GLU*     3.2    23.1    +      -       -      +
    187A  ASN*     3.0    32.7    +      -       -      +
    232A  ARG*     5.2     5.5    +      -       -      -
    239A  ARG*     6.3     0.7    -      -       -      -
----------------------------------------------------------
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Residues in contact with ASP 184 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    174A  ARG*     5.6     3.1    +      -       -      +
    180A  GLN*     3.1    17.9    +      -       -      +
    181A  ASP*     2.8    29.9    +      -       -      +
    183A  HIS*     1.3    70.2    -      -       -      +
    185A  ILE*     1.3    62.3    +      -       -      +
    187A  ASN*     3.2     9.1    +      -       -      +
    188A  GLU*     3.0    34.8    +      -       -      +
    265B  ARG*     5.4    12.2    +      -       -      -
----------------------------------------------------------
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Residues in contact with ILE 185 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    173A  ILE*     4.2    31.6    -      -       +      -
    174A  ARG*     3.5    55.6    -      -       +      +
    175A  ASP      4.1     0.4    -      -       -      -
    176A  PRO*     3.9    25.6    -      -       +      -
    181A  ASP*     2.8    23.8    +      -       -      +
    182A  GLY*     3.7     7.2    -      -       -      +
    184A  ASP*     1.3    71.8    -      -       -      +
    186A  GLU*     1.3    60.5    +      -       +      +
    188A  GLU*     3.0    10.0    +      -       -      +
    189A  CYS*     2.9    27.1    +      -       -      -
    277A  LEU*     4.1    14.7    -      -       +      +
----------------------------------------------------------
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Residues in contact with GLU 186 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    173A  ILE*     6.0     1.6    -      -       +      -
    182A  GLY      3.2    14.9    +      -       -      +
    183A  HIS*     3.4    24.3    -      -       -      +
    184A  ASP      3.2     0.2    -      -       -      -
    185A  ILE*     1.3    85.2    -      -       +      +
    187A  ASN*     1.3    63.3    +      -       -      +
    189A  CYS*     3.2    11.2    +      -       -      +
    190A  LEU*     3.2    24.3    +      -       -      +
    225A  LEU*     3.5    28.1    -      -       +      +
    229A  ILE*     4.3     4.6    -      -       +      +
    232A  ARG*     2.9    42.5    +      -       -      -
    240A  ILE*     5.0     4.2    -      -       -      +
----------------------------------------------------------
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Residues in contact with ASN 187 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    183A  HIS*     3.0    17.1    +      -       -      +
    184A  ASP*     3.2    11.4    +      -       -      +
    186A  GLU*     1.3    75.3    -      -       -      +
    188A  GLU*     1.3    67.5    +      -       +      +
    190A  LEU*     3.0    24.7    +      -       -      +
    191A  GLY      3.0    10.4    +      -       -      -
    239A  ARG*     4.8    12.6    +      -       -      +
    243A  VAL*     4.2     7.6    -      -       -      +
    247A  PHE*     3.2    33.5    -      -       +      -
    261B  ALA*     4.5     7.5    -      -       -      +
    262B  LYS      4.1     6.5    +      -       -      +
    264B  PRO*     3.8    13.9    -      -       +      +
----------------------------------------------------------
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Residues in contact with GLU 188 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    174A  ARG*     5.7     3.4    -      -       -      +
    184A  ASP*     3.0    28.8    +      -       -      +
    185A  ILE*     3.0     8.7    +      -       -      +
    187A  ASN*     1.3    75.6    -      -       -      +
    189A  CYS*     1.3    62.7    +      -       -      +
    191A  GLY*     3.1     3.1    +      -       -      -
    192A  MET*     2.9    26.7    +      -       -      +
    273A  THR*     4.7     6.9    -      -       +      +
    277A  LEU*     3.8    21.5    -      -       +      -
    264B  PRO*     3.4     9.9    -      -       -      +
    265B  ARG*     2.7    40.0    +      -       -      +
    266B  ALA*     2.8    36.1    +      -       +      +
----------------------------------------------------------
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Residues in contact with CYS 189 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    166A  LEU*     5.3     1.9    -      -       -      +
    173A  ILE*     3.9    32.1    -      -       -      -
    185A  ILE*     2.9    17.8    +      -       -      -
    186A  GLU      3.4     9.2    -      -       -      +
    187A  ASN      3.1     0.2    -      -       -      -
    188A  GLU*     1.3    77.9    -      -       -      +
    190A  LEU*     1.3    57.1    +      -       +      +
    192A  MET*     3.4    11.4    +      -       -      +
    193A  ALA      3.1    19.6    +      -       -      -
    221A  ILE*     3.5    20.0    -      -       +      +
    222A  PRO*     4.0    15.5    -      -       +      -
    225A  LEU*     4.0    22.2    -      -       +      -
    277A  LEU*     4.2     8.5    -      -       -      -
----------------------------------------------------------
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Residues in contact with LEU 190 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    186A  GLU      3.2    16.6    +      -       -      +
    187A  ASN*     3.0    20.0    +      -       -      +
    189A  CYS*     1.3    74.1    -      -       +      +
    191A  GLY*     1.4    54.1    +      -       -      +
    193A  ALA*     2.8    24.4    +      -       -      +
    194A  VAL*     2.9    21.0    +      -       -      +
    217A  TYR*     4.1    34.8    -      -       +      -
    221A  ILE*     4.7     5.2    -      -       +      -
    225A  LEU*     6.3     1.6    -      -       +      -
    239A  ARG*     6.2     0.7    -      -       -      +
    240A  ILE*     4.1    34.5    -      -       +      +
    243A  VAL*     4.2    15.0    -      -       +      -
    244A  PHE*     4.0    20.9    -      -       +      +
    247A  PHE*     4.2     9.4    -      -       +      -
----------------------------------------------------------
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Residues in contact with GLY 191 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    187A  ASN      3.0    10.5    +      -       -      -
    188A  GLU      3.5     4.3    -      -       -      -
    190A  LEU*     1.4    71.2    -      -       -      +
    192A  MET*     1.3    57.6    -      -       -      +
    194A  VAL*     2.7    19.7    +      -       -      +
    195A  LEU*     2.8    13.0    +      -       -      +
    247A  PHE*     4.7     0.4    -      -       -      -
    264B  PRO*     3.8    23.2    -      -       -      +
    266B  ALA*     4.3     5.6    -      -       -      -
    267B  LEU*     3.5    21.8    -      -       -      +
----------------------------------------------------------
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Residues in contact with MET 192 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    166A  LEU*     3.8    22.0    -      -       +      -
    188A  GLU      2.9    20.0    +      -       -      +
    189A  CYS*     3.4     9.2    -      -       -      +
    191A  GLY*     1.3    74.1    -      -       -      +
    193A  ALA*     1.3    61.8    +      -       -      +
    195A  LEU*     3.4    11.7    +      -       -      +
    196A  ALA*     3.0    23.7    +      -       -      +
    220A  TYR      4.8     2.7    -      -       -      +
    270A  TYR*     3.4    60.2    -      -       +      +
    273A  THR*     3.6    28.3    -      -       +      -
    274A  LEU*     4.0    13.5    -      -       +      +
    277A  LEU*     4.1    17.7    -      -       +      -
    266B  ALA*     4.3     2.2    -      -       +      +
----------------------------------------------------------
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Residues in contact with ALA 193 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    189A  CYS      3.1    11.1    +      -       -      +
    190A  LEU      2.8    13.2    +      -       -      +
    192A  MET*     1.3    76.2    -      -       -      +
    194A  VAL*     1.3    57.2    +      -       -      +
    196A  ALA*     3.3     1.2    +      -       -      +
    197A  ILE*     3.0    36.3    +      -       -      +
    217A  TYR*     4.1     8.1    -      -       +      -
    220A  TYR*     3.6    29.2    -      -       +      -
    221A  ILE*     4.0    12.1    -      -       +      -
    244A  PHE*     4.0    14.6    -      -       +      -
----------------------------------------------------------
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Residues in contact with VAL 194 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    190A  LEU      2.9    14.5    +      -       -      +
    191A  GLY      2.7    10.1    +      -       -      +
    193A  ALA*     1.3    78.3    -      -       -      +
    195A  LEU*     1.3    49.5    +      -       -      -
    197A  ILE*     3.8     0.6    -      -       -      +
    198A  SER*     2.7    41.4    +      -       -      +
    244A  PHE*     3.9    17.0    -      -       +      -
    247A  PHE*     4.0    12.6    -      -       +      -
    248A  LEU*     3.8    34.3    -      -       +      +
    251A  PHE*     3.6    26.2    -      -       +      -
    267B  LEU*     3.4    29.2    -      -       +      -
----------------------------------------------------------
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Residues in contact with LEU 195 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    159A  PHE*     5.3     2.0    -      -       +      -
    191A  GLY      2.8    18.7    +      -       -      +
    192A  MET*     3.7    17.3    -      -       -      +
    194A  VAL*     1.3    72.5    -      -       -      +
    196A  ALA*     1.3    64.8    +      -       -      +
    198A  SER*     3.9     2.9    -      -       -      -
    199A  HIS*     2.9    28.0    +      -       -      +
    251A  PHE*     4.0     7.6    -      -       +      -
    266A  LEU*     4.0    16.5    -      -       +      +
    269A  LYS*     4.0     4.5    -      -       +      -
    270A  TYR*     3.8    42.4    -      -       +      +
    266B  ALA*     3.6    22.2    -      -       +      +
    267B  LEU*     3.5    21.1    -      -       +      -
    269B  PHE*     3.9    22.7    -      -       +      -
----------------------------------------------------------
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Residues in contact with ALA 196 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    159A  PHE*     4.6     8.1    -      -       -      -
    163A  GLN*     3.7    27.4    +      -       +      +
    192A  MET      3.0    18.6    +      -       -      +
    193A  ALA      3.8     3.6    -      -       -      +
    195A  LEU*     1.3    77.3    -      -       -      +
    197A  ILE*     1.3    58.6    +      -       -      +
    199A  HIS*     3.6     3.1    +      -       -      +
    200A  TYR*     3.0    26.7    +      -       -      +
    220A  TYR*     3.8    24.4    -      -       +      +
    270A  TYR*     4.5     8.9    -      -       +      +
----------------------------------------------------------
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Residues in contact with ILE 197 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    193A  ALA      3.0    25.2    +      -       -      +
    194A  VAL*     3.8     3.6    -      -       -      +
    196A  ALA*     1.3    73.5    -      -       -      +
    198A  SER*     1.4    70.7    +      -       -      +
    200A  TYR*     3.0     9.5    +      -       +      +
    201A  ALA*     2.9    26.2    +      -       +      +
    209A  PRO*     6.2     4.7    -      -       +      -
    216A  SER      4.6     3.8    -      -       -      +
    220A  TYR*     3.0    53.4    -      -       +      +
    244A  PHE*     4.5    15.3    -      -       +      -
    248A  LEU*     4.2    22.4    -      -       +      -
----------------------------------------------------------
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Residues in contact with SER 198 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    194A  VAL*     2.7    24.9    +      -       -      +
    195A  LEU      3.9     2.2    -      -       -      -
    197A  ILE*     1.4    75.6    -      -       -      +
    199A  HIS*     1.3    58.2    +      -       -      +
    201A  ALA*     3.1     5.0    +      -       -      +
    202A  MET*     2.8    30.9    +      -       -      +
    248A  LEU*     4.3     1.2    -      -       -      +
    251A  PHE*     3.2    35.5    -      -       -      -
    252A  ASN*     3.2    25.0    +      -       -      +
    256A  ILE*     4.6     5.2    -      -       -      -
    266A  LEU*     4.0     9.2    -      -       -      -
----------------------------------------------------------
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Residues in contact with HIS 199 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    156A  GLU*     3.8     9.2    -      -       -      -
    159A  PHE*     3.4    30.4    -      +       +      -
    195A  LEU      2.9    19.6    +      -       -      +
    196A  ALA      3.7     3.8    -      -       -      +
    198A  SER*     1.3    77.4    -      -       -      +
    200A  TYR*     1.3    64.3    +      -       -      +
    202A  MET*     3.9     3.1    -      -       -      +
    203A  MET*     3.1    40.3    +      -       +      +
    263A  THR*     3.3    32.5    -      -       -      -
    266A  LEU*     3.4    19.4    -      -       +      +
    267A  LYS*     3.1    41.3    +      -       +      +
----------------------------------------------------------
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Residues in contact with TYR 200 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    196A  ALA      3.0    13.9    +      -       -      +
    197A  ILE*     3.0    15.2    +      -       +      +
    199A  HIS*     1.3    78.3    +      -       -      +
    201A  ALA*     1.3    68.4    +      -       +      +
    203A  MET*     3.2     8.3    +      -       +      +
    204A  LYS*     3.2    60.7    +      -       +      +
    206A  MET*     6.6     0.2    -      -       -      -
    209A  PRO*     6.3     3.8    -      -       +      -
    220A  TYR*     5.3    12.3    -      +       +      +
----------------------------------------------------------
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Residues in contact with ALA 201 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    197A  ILE*     2.9    16.0    +      -       +      +
    198A  SER*     3.5     9.6    -      -       -      +
    200A  TYR*     1.3    84.6    -      -       +      +
    202A  MET*     1.3    62.2    +      -       +      +
    203A  MET      3.0     0.4    +      -       -      -
    204A  LYS*     3.1     3.2    +      -       -      -
    205A  LYS      3.0     6.1    +      -       -      -
    206A  MET*     3.0    48.1    +      -       +      +
    207A  GLN*     5.3     1.6    -      -       -      -
    208A  LEU      5.9     0.2    -      -       -      +
    209A  PRO*     5.0    12.8    -      -       +      -
    252A  ASN*     5.5     4.3    -      -       -      +
----------------------------------------------------------
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Residues in contact with MET 202 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    198A  SER      2.8    19.4    +      -       -      +
    199A  HIS      4.1     1.3    -      -       -      +
    200A  TYR      3.4     0.2    -      -       -      -
    201A  ALA*     1.3    73.2    -      -       +      +
    203A  MET*     1.3    60.1    +      -       -      +
    205A  LYS*     3.7    25.0    +      -       -      +
    206A  MET      5.1     2.9    -      -       -      +
    252A  ASN*     6.0     1.1    -      -       -      +
    256A  ILE*     4.2    26.7    -      -       +      -
    261A  VAL      3.2    26.5    -      -       -      +
    262A  SER*     3.8     1.6    -      -       -      -
    263A  THR*     3.5    37.1    -      -       +      +
    266A  LEU*     3.8    22.4    -      -       -      -
----------------------------------------------------------
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Residues in contact with MET 203 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    156A  GLU*     4.7    10.3    -      -       -      +
    199A  HIS*     3.1    41.2    +      -       +      +
    200A  TYR*     3.6     7.4    -      -       +      +
    201A  ALA      3.0     1.2    -      -       -      -
    202A  MET*     1.3    76.5    -      -       -      +
    204A  LYS*     1.3    70.3    +      -       +      +
    205A  LYS*     3.2    17.6    +      -       -      +
    263A  THR*     3.3    40.8    -      -       +      +
    267A  LYS*     4.0     7.6    -      -       -      +
----------------------------------------------------------
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Residues in contact with LYS 204 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     44A  ASP*     6.3     1.2    -      -       -      +
    200A  TYR*     3.2    53.3    +      -       +      +
    201A  ALA*     3.1     5.3    +      -       -      +
    203A  MET*     1.3    83.1    -      -       +      +
    205A  LYS*     1.3    72.0    +      -       -      +
    206A  MET*     3.4    22.7    -      -       +      +
----------------------------------------------------------
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Residues in contact with LYS 205 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    201A  ALA      3.0     4.2    +      -       -      -
    202A  MET*     3.7    18.9    +      -       -      +
    203A  MET*     3.2    15.5    +      -       -      +
    204A  LYS*     1.3    81.9    -      -       -      +
    206A  MET*     1.3    62.4    +      -       -      +
----------------------------------------------------------
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A short description of the analytical approach
The contact analysis used in this page is based upon the approach developed in: Sobolev V., Wade R.C., Vriend G. and Edelman M. PROTEINS (1996) 25, 120-129. Contact legitimacy depends on the hydrophobic-hydrophilic properties of the contacting atoms. In order to define it, for each inter-atomic contact, eight atom classes have been introduced:


   I  Hydrophilic      - N and O that can donate and accept hydrogen bonds
                         (e.g., oxygen of hydroxyl group of Ser. or Thr)
  II  Acceptor         - N or O that can only accept a hydrogen bond
 III  Donor            - N that can only donate a hydrogen bond
  IV  Hydrophobic      - Cl, Br, I and all C atoms that are not in
                         aromatic rings and do not have a covalent bond to
                         a N or O atom
   V  Aromatic         - C in aromatic rings irrespective of any other 
                         bonds formed by the atom
  VI  Neutral          - C atoms that have a covalent bond to at least one
                         atom of class I or two or more atoms from class II
                         or III; atoms; S, F, P, and metal atoms in all cases
 VII  Neutral-donor    - C atoms that have a covalent bond with only one
                         atom of class III
VIII  Neutral-acceptor - C atoms that have a covalent bond with only 
                         one atom of class II
For each pair of contacts the state of legitimacy is shown below:

Legend:
+, legitimate
-, illegitimate
------------------------------------------------------------
  Atomic class           I  II  III   IV   V   VI  VII  VIII
------------------------------------------------------------
   I  (Hydrophilic)      +   +    +    -   +   +    +    +
  II  (Acceptor)         +   -    +    -   +   +    +    -
 III  (Donor)            +   +    -    -   +   +    -    +
  IV  (Hydrophobic)      -   -    -    +   +   +    +    +
   V  (Aromatic)         +   +    +    +   +   +    +    +
  VI  (Neutral)          +   +    +    +   +   +    +    +
 VII  (Neutral-donor)    +   +    -    +   +   +    -    +
VIII  (Neutral-acceptor) +   -    +    +   +   +    +    -
------------------------------------------------------------
Warning!
Atom classes for heterogroups are automatically assigned based on the atomic coordinates. However, in three cases (see below) the automatic assignment is currently ambiguous. In these cases, the user is advised to manually analyse the full list of contacts using LPC software.
1. Carbon atoms belonging to a 4-, 5- or 6-member ring are 
   considered "aromatic" (Class V) if the ring is approximately
   planar, and "hydrophobic" (Class IV) or "neutral" (Classes
   VI, VII, VIII) if the ring is non-planar.
2. The oxygen atom of a carbonyl or hydroxy group is considered
   "hydroxy" (Class I) if the CO bond is longer than 1.29 Å, and
   "carbonyl" (Class II) if shorter.
3. All nitrogen atoms are considered "hydrophilic" (Class I).

Please E-mail any questions and/or suggestions concerning this page to Vladimir.Sobolev@weizmann.ac.il