Contacts of the helix formed by residues 177 - 201 (chain A) in PDB entry 2VE7


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 177 (chain A).
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    168A  SER*     3.6    36.7    -      -       -      +
    171A  THR*     3.1    38.5    +      -       -      +
    172A  VAL*     3.5     8.7    -      -       -      +
    174A  ALA*     2.8    11.0    +      -       -      +
    175A  PRO      3.3     0.4    -      -       -      -
    176A  HIS*     1.3    82.3    +      -       -      +
    178A  TRP*     1.3    66.6    +      -       -      +
    179A  PRO*     3.2     3.6    -      -       -      -
    180A  HIS*     2.9    20.1    +      -       +      +
    181A  ILE*     3.2    13.2    +      -       +      -
----------------------------------------------------------
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Residues in contact with TRP 178 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     92A  ILE*     5.2     2.9    -      -       +      -
     96A  ILE*     3.5    18.7    -      -       +      +
     99A  LEU*     4.1    10.8    -      -       +      -
    117A  LEU*     2.7    31.5    +      -       +      -
    118A  GLN      3.0    20.6    +      -       -      +
    120A  PRO*     3.5    28.9    -      -       +      -
    125A  PHE*     4.5     6.5    -      +       -      -
    128A  ILE*     5.9     1.3    -      -       +      -
    172A  VAL      3.1    30.3    +      -       -      +
    173A  GLY*     4.1     9.0    -      -       -      +
    174A  ALA      3.0    11.7    +      -       -      +
    175A  PRO*     5.5     0.9    -      -       +      -
    177A  THR*     1.3    73.6    -      -       -      +
    179A  PRO*     1.4    69.8    -      -       +      +
    181A  ILE*     3.0    24.4    +      -       +      +
    182A  VAL*     2.8    47.3    +      -       +      +
    185A  LEU*     3.8    23.8    -      -       +      -
----------------------------------------------------------
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Residues in contact with PRO 179 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     86A  LEU*     3.9    22.1    -      -       +      +
     92A  ILE*     3.7    35.7    -      -       +      +
    175A  PRO      3.6    20.9    -      -       -      +
    176A  HIS*     4.1     3.1    -      -       -      -
    177A  THR      3.3     6.7    -      -       -      +
    178A  TRP*     1.4    95.2    -      -       +      +
    180A  HIS*     1.3    64.5    +      -       +      +
    182A  VAL*     3.6     5.8    -      -       +      +
    183A  ALA*     3.3    21.8    +      -       -      +
----------------------------------------------------------
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Residues in contact with HIS 180 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     84A  ARG*     5.5     0.2    +      -       -      -
     86A  LEU*     3.5    30.8    -      -       +      +
    160A  TYR*     4.5     2.8    +      -       -      -
    164A  LEU*     4.7     7.8    -      -       +      +
    168A  SER*     6.1     1.8    -      -       -      -
    176A  HIS      3.7    22.4    +      -       -      -
    177A  THR*     2.9    12.7    +      -       +      +
    179A  PRO*     1.3    76.3    -      -       +      +
    181A  ILE*     1.3    73.7    +      -       +      +
    183A  ALA*     3.6     4.4    +      -       -      +
    184A  ALA*     3.2    19.8    +      -       -      +
----------------------------------------------------------
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Residues in contact with ILE 181 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    125A  PHE*     3.4    36.6    -      -       +      -
    164A  LEU*     3.9    19.7    -      -       +      -
    168A  SER*     4.2    12.8    -      -       -      +
    169A  MET*     3.9    25.8    -      -       +      -
    172A  VAL*     4.1    12.1    -      -       +      +
    177A  THR*     3.2    24.4    +      -       +      +
    178A  TRP*     3.0    20.8    +      -       +      -
    180A  HIS*     1.3    76.5    -      -       +      +
    182A  VAL*     1.3    61.5    +      -       -      +
    184A  ALA*     2.8    23.8    +      -       +      +
    185A  LEU*     2.8    14.1    +      -       +      +
----------------------------------------------------------
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Residues in contact with VAL 182 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     92A  ILE*     4.1    26.2    -      -       +      -
     95A  CYS*     4.1    14.8    -      -       +      +
     96A  ILE*     3.9    23.1    -      -       +      +
     99A  LEU*     3.9    19.5    -      -       +      -
    178A  TRP*     2.8    52.2    +      -       +      +
    179A  PRO      3.6     7.0    -      -       -      +
    181A  ILE*     1.3    72.3    -      -       -      +
    183A  ALA*     1.3    66.4    +      -       -      +
    185A  LEU*     3.0     6.8    +      -       -      +
    186A  VAL*     2.8    26.4    +      -       -      +
----------------------------------------------------------
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Residues in contact with ALA 183 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     84A  ARG*     3.4    35.4    +      -       -      +
     86A  LEU*     3.8    15.5    -      -       +      -
     92A  ILE*     5.5     0.2    -      -       +      -
     95A  CYS*     4.9    10.1    -      -       -      -
    179A  PRO      3.3    14.6    +      -       -      +
    180A  HIS*     3.6     6.7    -      -       -      +
    181A  ILE      3.2     0.2    -      -       -      -
    182A  VAL*     1.3    84.1    -      -       +      +
    184A  ALA*     1.3    56.8    +      -       -      +
    186A  VAL*     3.2     8.0    +      -       -      +
    187A  TRP*     2.8    28.8    +      -       -      +
----------------------------------------------------------
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Residues in contact with ALA 184 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    155A  PHE*     3.3    31.9    -      -       +      -
    160A  TYR*     3.6    27.1    +      -       +      +
    164A  LEU*     4.2    12.6    -      -       +      -
    180A  HIS      3.2    10.1    +      -       -      +
    181A  ILE*     2.8    17.4    +      -       +      +
    183A  ALA*     1.3    74.3    -      -       -      +
    185A  LEU*     1.3    57.9    +      -       -      +
    187A  TRP*     3.1     3.1    +      -       -      +
    188A  LEU      2.8    23.9    +      -       -      -
----------------------------------------------------------
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Residues in contact with LEU 185 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     99A  LEU*     3.9    27.6    -      -       +      -
    125A  PHE*     3.9    32.5    -      -       +      -
    128A  ILE*     4.5     9.6    -      -       +      -
    129A  PHE*     4.7    13.5    -      -       +      -
    132A  LEU*     4.2    17.3    -      -       +      +
    155A  PHE*     4.6    13.2    -      -       +      -
    178A  TRP*     3.8    30.7    -      -       +      -
    181A  ILE*     2.8    14.0    +      -       +      +
    182A  VAL*     3.0     7.2    +      -       -      +
    184A  ALA*     1.3    76.7    -      -       -      +
    186A  VAL*     1.3    50.5    +      -       -      +
    188A  LEU*     2.9     8.7    +      -       +      +
    189A  ILE*     2.8    40.4    +      -       -      +
----------------------------------------------------------
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Residues in contact with VAL 186 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     84A  ARG*     6.2     0.2    -      -       -      +
     95A  CYS*     3.4    39.3    -      -       +      +
     98A  GLN*     4.0    16.4    -      -       +      +
     99A  LEU*     4.4     6.7    -      -       +      +
    182A  VAL      2.8    16.9    +      -       -      +
    183A  ALA*     3.6     6.7    -      -       -      +
    185A  LEU*     1.3    76.7    -      -       -      +
    187A  TRP*     1.3    61.9    +      -       -      +
    189A  ILE*     3.5    11.7    +      -       +      +
    190A  ASP*     3.2    25.4    +      -       -      +
     74C  MET*     3.3    36.1    -      -       +      -
----------------------------------------------------------
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Residues in contact with TRP 187 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     84A  ARG*     4.6     3.8    -      -       -      +
    155A  PHE*     4.2    11.0    -      +       -      -
    158A  LEU*     3.5    29.2    -      -       +      -
    159A  GLY      3.8     7.6    -      -       -      -
    160A  TYR*     3.2    70.5    -      +       +      -
    161A  PRO*     4.1     1.2    -      -       +      +
    183A  ALA      2.8    11.7    +      -       -      +
    184A  ALA      3.1     6.5    +      -       -      +
    186A  VAL*     1.3    74.5    -      -       -      +
    188A  LEU*     1.3    74.2    +      -       -      +
    190A  ASP*     3.3     7.9    +      -       -      +
    191A  CYS*     3.1    46.0    +      -       -      -
     78C  LEU*     2.7    37.7    +      -       +      +
     79C  MET*     3.4    23.0    -      -       +      +
     82C  PHE*     4.2     7.6    -      -       +      -
----------------------------------------------------------
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Residues in contact with LEU 188 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    129A  PHE*     4.1    26.5    -      -       +      -
    132A  LEU*     3.5    36.1    -      -       +      -
    133A  TYR*     4.2     9.0    -      -       +      +
    136A  LEU*     4.1    14.1    -      -       +      -
    155A  PHE*     4.1    12.3    -      -       +      -
    158A  LEU*     3.6    30.5    -      -       +      -
    184A  ALA      2.8    13.0    +      -       -      +
    185A  LEU*     3.3    10.3    -      -       +      +
    187A  TRP*     1.3    85.9    -      -       +      +
    189A  ILE*     1.3    61.5    +      -       -      +
    191A  CYS*     3.2     8.0    +      -       +      +
    192A  ILE*     3.1    27.7    +      -       +      +
----------------------------------------------------------
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Residues in contact with ILE 189 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     98A  GLN*     4.4     5.4    -      -       +      +
     99A  LEU*     3.6    45.5    -      -       +      +
    102A  PHE*     3.5    38.4    -      -       +      -
    132A  LEU*     4.0    21.1    -      -       +      -
    185A  LEU      2.8    21.5    +      -       -      +
    186A  VAL*     3.7    16.2    -      -       +      +
    188A  LEU*     1.3    69.9    -      -       -      +
    190A  ASP*     1.3    61.6    +      -       -      +
    192A  ILE*     3.2     9.8    +      -       -      +
    193A  LYS*     2.8    40.6    +      -       -      +
----------------------------------------------------------
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Residues in contact with ASP 190 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     98A  GLN*     5.9     0.2    +      -       -      -
    186A  VAL*     3.2    16.9    +      -       -      +
    187A  TRP*     3.3     9.0    +      -       -      +
    189A  ILE*     1.3    76.1    -      -       -      +
    191A  CYS*     1.3    67.4    +      -       -      +
    193A  LYS*     3.0    21.5    +      -       -      +
    194A  ILE*     2.8    28.1    +      -       -      +
     72C  GLY      4.6     0.2    -      -       -      +
     73C  VAL*     3.3    27.8    -      -       +      +
     74C  MET*     2.8    38.8    +      -       -      +
     79C  MET*     4.2    16.1    -      -       +      +
----------------------------------------------------------
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Residues in contact with CYS 191 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    136A  LEU*     4.4     7.9    -      -       +      -
    158A  LEU*     5.1     0.7    -      -       -      -
    187A  TRP*     3.1    50.7    +      -       -      -
    188A  LEU*     3.2    11.4    +      -       +      +
    190A  ASP*     1.3    76.7    -      -       -      +
    192A  ILE*     1.3    51.3    +      -       -      +
    194A  ILE*     3.1     6.2    +      -       -      +
    195A  HIS*     2.8    31.7    +      -       -      +
     79C  MET*     4.8     3.7    -      -       -      -
     82C  PHE*     3.4    54.3    -      -       +      -
----------------------------------------------------------
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Residues in contact with ILE 192 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    102A  PHE*     3.8    16.8    -      -       +      -
    132A  LEU*     3.2    53.4    -      -       +      +
    135A  PHE*     3.6    37.0    -      -       +      -
    136A  LEU*     4.1    21.5    -      -       +      -
    188A  LEU*     3.1    17.9    -      -       +      +
    189A  ILE*     3.4    10.1    -      -       -      +
    191A  CYS*     1.3    73.2    -      -       -      +
    193A  LYS*     1.3    58.2    +      -       -      +
    195A  HIS*     3.2     0.7    +      -       +      +
    196A  THR*     2.7    43.3    +      -       -      +
----------------------------------------------------------
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Residues in contact with LYS 193 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     98A  GLN*     6.2     2.0    -      -       -      -
    102A  PHE*     4.6    14.8    -      -       +      -
    189A  ILE*     2.8    31.5    +      -       +      +
    190A  ASP*     3.0    25.6    +      -       -      +
    192A  ILE*     1.3    76.3    -      -       -      +
    194A  ILE*     1.3    60.9    +      -       -      +
    196A  THR*     3.6     8.7    +      -       -      +
    197A  ALA*     3.0    25.3    +      -       -      +
     71C  SER      4.5    17.2    -      -       -      +
     72C  GLY*     3.4    25.7    +      -       -      +
     73C  VAL*     5.0     1.6    -      -       +      -
----------------------------------------------------------
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Residues in contact with ILE 194 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    190A  ASP      2.8    20.3    +      -       -      +
    191A  CYS      3.3     6.5    -      -       -      +
    193A  LYS*     1.3    72.6    -      -       -      +
    195A  HIS*     1.3    63.3    +      -       -      +
    197A  ALA*     3.2     8.1    +      -       -      +
    198A  MET*     3.0    51.1    +      -       +      +
     67C  MET*     3.9    21.1    -      -       -      -
     68C  PRO*     4.6     6.2    -      -       +      +
     71C  SER*     4.7     4.9    +      -       -      +
     73C  VAL*     4.0    11.9    -      -       +      -
     79C  MET*     3.5    33.9    -      -       +      -
     82C  PHE*     4.0    21.1    -      -       +      -
     83C  LEU*     4.1    11.7    -      -       +      -
     86C  SER*     4.2     2.7    -      -       -      +
----------------------------------------------------------
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Residues in contact with HIS 195 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    135A  PHE      3.7    22.9    +      -       -      -
    136A  LEU*     3.9    22.8    +      -       +      -
    191A  CYS      2.8    18.6    +      -       -      +
    192A  ILE*     3.6     3.8    -      -       +      +
    194A  ILE*     1.3    73.0    -      -       -      +
    196A  THR*     1.3    64.6    +      -       -      +
    198A  MET*     3.0    22.7    +      -       -      +
    199A  LYS*     3.5    35.0    +      -       +      +
     82C  PHE*     4.4     3.1    -      -       +      -
     85C  PHE*     4.1    20.0    -      +       -      -
     86C  SER*     3.2    37.0    +      -       -      +
     89C  VAL*     4.6    16.5    -      -       +      +
     90C  THR*     5.5     2.2    -      -       -      -
----------------------------------------------------------
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Residues in contact with THR 196 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    106A  ASN*     6.3     0.4    -      -       -      +
    135A  PHE*     4.4     3.8    -      -       -      +
    192A  ILE*     2.7    33.1    +      -       -      +
    193A  LYS*     3.7     7.9    -      -       -      +
    195A  HIS*     1.3    73.4    -      -       -      +
    197A  ALA*     1.3    65.9    +      -       +      +
    199A  LYS*     3.4    22.2    -      -       -      +
    200A  GLU*     3.5    22.4    +      -       -      +
   2225B  GOL      3.7    25.9    +      -       -      +
----------------------------------------------------------
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Residues in contact with ALA 197 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    193A  LYS      3.0    18.3    +      -       -      +
    194A  ILE*     3.5     6.1    -      -       -      +
    195A  HIS      3.1     0.2    -      -       -      -
    196A  THR*     1.3    75.3    -      -       +      +
    198A  MET*     1.3    53.5    +      -       -      +
    199A  LYS      2.8    15.5    +      -       -      -
    200A  GLU*     3.3     5.1    +      -       -      +
    201A  SER*     3.3    24.3    +      -       -      -
     68C  PRO*     4.7    16.6    -      -       +      +
     69C  VAL*     6.4     0.9    -      -       +      -
     71C  SER*     6.1     3.1    -      -       -      +
----------------------------------------------------------
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Residues in contact with MET 198 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    194A  ILE*     3.0    44.1    +      -       +      +
    195A  HIS*     3.0     5.9    +      -       -      +
    197A  ALA*     1.3    72.2    -      -       -      +
    199A  LYS*     1.3    61.5    +      -       -      +
    201A  SER*     4.2    11.2    -      -       -      +
    202A  SER*     4.8     2.3    +      -       -      -
     66C  MET*     4.0    12.3    -      -       -      +
     68C  PRO*     3.6    35.2    -      -       +      -
     83C  LEU*     4.2     4.7    -      -       +      -
     86C  SER*     3.8    12.1    +      -       -      +
     87C  ASN*     3.2    35.2    -      -       -      +
     90C  THR*     4.3    14.4    +      -       -      +
----------------------------------------------------------
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Residues in contact with LYS 199 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    135A  PHE      4.9     4.0    +      -       -      -
    138A  PRO*     6.1     0.8    -      -       -      +
    195A  HIS*     3.6    43.0    -      -       +      +
    196A  THR*     3.4    12.8    -      -       -      +
    197A  ALA      2.8     0.6    +      -       -      -
    198A  MET*     1.3    77.5    -      -       -      +
    200A  GLU*     1.3    69.3    +      -       -      +
    201A  SER      3.5     0.2    -      -       -      -
    202A  SER*     3.4    15.2    +      -       -      -
    119B  ALA*     3.2    31.8    +      -       -      +
    120B  PRO      5.1     0.4    +      -       -      -
    121B  SER*     4.0    18.0    +      -       -      +
    123B  LYS*     5.6     0.7    -      -       -      +
   2225B  GOL      3.3    32.8    +      -       -      +
     90C  THR*     5.7     4.5    -      -       +      +
----------------------------------------------------------
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Residues in contact with GLU 200 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    196A  THR*     3.5    21.3    +      -       -      +
    197A  ALA*     3.3     7.6    +      -       -      +
    199A  LYS*     1.3    81.6    -      -       -      +
    201A  SER*     1.3    62.4    +      -       -      +
    202A  SER*     3.4     3.6    +      -       -      -
    121B  SER*     3.1    13.3    -      -       -      -
    122B  VAL*     2.4    48.3    +      -       +      +
    123B  LYS*     3.4    36.3    -      -       +      +
    170B  TYR      5.5     0.3    -      -       -      +
   2225B  GOL      3.7    14.3    +      -       -      -
----------------------------------------------------------
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Residues in contact with SER 201 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    197A  ALA      3.3    10.7    +      -       -      -
    198A  MET*     4.2     7.0    -      -       -      +
    199A  LYS      4.2     8.0    +      -       -      -
    200A  GLU*     1.3    79.1    -      -       -      +
    202A  SER*     1.4    66.5    +      -       -      +
    123B  LYS*     6.1     0.2    -      -       -      +
----------------------------------------------------------
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A short description of the analytical approach
The contact analysis used in this page is based upon the approach developed in: Sobolev V., Wade R.C., Vriend G. and Edelman M. PROTEINS (1996) 25, 120-129. Contact legitimacy depends on the hydrophobic-hydrophilic properties of the contacting atoms. In order to define it, for each inter-atomic contact, eight atom classes have been introduced:


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

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

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