Contacts of the helix formed by residues 189 - 213 (chain B) in PDB entry 6IY6


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 189 (chain B).
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     81B  ARG*     5.8     0.2    -      -       -      +
    185B  ILE*     4.3     2.0    -      -       +      +
    186B  ASP*     2.5    37.1    +      -       -      +
    188B  ARG*     1.3    75.2    -      -       -      +
    190B  SER*     1.3    57.5    +      -       -      +
    191B  THR*     4.4     7.4    -      -       -      -
    192B  SER*     2.9    32.6    +      -       -      -
    193B  GLN      3.0    10.6    +      -       -      -
    331B  GLN*     6.1     0.9    -      -       -      -
    602B  PO4      4.2    20.1    +      -       -      +
----------------------------------------------------------
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Residues in contact with SER 190 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     81B  ARG*     6.2     1.5    -      -       -      +
     84B  GLN*     3.4    30.5    -      -       -      +
    188B  ARG      3.4     3.9    +      -       -      -
    189B  THR*     1.3    69.1    -      -       -      +
    191B  THR*     1.3    57.2    +      -       -      +
    193B  GLN*     4.1     1.8    -      -       -      -
    194B  ALA*     3.1    22.0    +      -       -      +
    327B  THR*     3.1    31.1    +      -       -      +
    331B  GLN*     5.7     0.3    +      -       -      -
----------------------------------------------------------
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Residues in contact with THR 191 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    189B  THR*     2.9     7.7    +      -       -      -
    190B  SER*     1.3    75.9    +      -       -      +
    192B  SER*     1.3    56.6    +      -       -      +
    194B  ALA*     3.0     7.9    +      -       -      +
    195B  VAL*     2.8    48.9    +      -       +      +
    327B  THR*     4.1    10.3    +      -       -      +
    328B  VAL*     3.9     7.3    -      -       +      +
    331B  GLN*     3.2    36.5    +      -       -      +
    332B  PHE*     4.1    26.9    -      -       +      -
    483B  LEU*     6.0     0.9    -      -       +      -
----------------------------------------------------------
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Residues in contact with SER 192 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    262A  PHE*     4.9     0.2    -      -       -      -
    183B  ARG*     4.6     3.1    +      -       -      -
    186B  ASP*     3.2    22.2    +      -       -      -
    187B  LEU*     3.7    25.4    -      -       -      +
    189B  THR*     2.9    25.7    +      -       -      -
    191B  THR*     1.3    75.9    -      -       -      +
    193B  GLN*     1.3    62.9    +      -       -      -
    195B  VAL*     3.1     5.8    +      -       -      +
    196B  PHE*     3.0    40.2    +      -       -      -
    488B  GLN      5.5     1.7    +      -       -      -
----------------------------------------------------------
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Residues in contact with GLN 193 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    260A  ALA      2.8    29.7    +      -       -      -
    261A  ASP*     3.8    11.0    -      -       +      +
    262A  PHE*     3.3    23.6    -      -       -      -
     83B  GLN*     3.7     9.0    -      -       -      -
     84B  GLN*     3.5    26.2    -      -       +      +
    187B  LEU      2.9    15.6    +      -       -      +
    188B  ARG      3.6    18.8    -      -       -      +
    189B  THR      3.0     8.4    +      -       -      +
    190B  SER      3.8     2.5    -      -       -      +
    192B  SER*     1.3    74.3    -      -       -      +
    194B  ALA*     1.3    57.0    +      -       -      +
    197B  ARG*     2.9    71.8    +      -       -      +
----------------------------------------------------------
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Residues in contact with ALA 194 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     84B  GLN*     3.0    16.4    +      -       -      +
    190B  SER      3.1    16.2    +      -       -      +
    191B  THR      3.0     5.2    +      -       -      +
    193B  GLN*     1.3    72.2    -      -       -      +
    195B  VAL*     1.3    66.0    +      -       -      +
    198B  LEU*     3.1    26.2    +      -       -      +
    324B  GLU*     3.3    38.0    -      -       -      +
    327B  THR*     3.7    12.1    -      -       +      -
    328B  VAL*     3.8     5.6    -      -       +      -
----------------------------------------------------------
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Residues in contact with VAL 195 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    191B  THR*     2.8    28.8    +      -       +      +
    192B  SER*     3.5     9.6    -      -       -      +
    194B  ALA*     1.3    72.1    -      -       -      +
    196B  PHE*     1.3    62.9    +      -       +      +
    198B  LEU*     3.3     5.9    +      -       -      +
    199B  GLN*     2.9    29.8    +      -       -      +
    328B  VAL*     3.6    24.2    -      -       +      -
    477B  THR*     4.0     9.1    -      -       +      +
    481B  LEU*     3.9    14.4    -      -       +      -
    483B  LEU*     4.3     9.2    -      -       +      -
    488B  GLN      3.9    21.5    -      -       -      +
    489B  THR*     4.1    22.4    -      -       +      -
----------------------------------------------------------
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Residues in contact with PHE 196 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    216A  VAL*     4.2     5.9    -      -       +      +
    217A  GLU      4.7     1.7    -      -       -      +
    262A  PHE*     3.9    11.0    -      +       +      -
    183B  ARG*     4.0     5.6    -      -       -      -
    187B  LEU*     3.7    27.4    -      -       +      -
    192B  SER*     3.0    34.6    +      -       -      +
    195B  VAL*     1.3    76.2    -      -       +      +
    197B  ARG*     1.3    60.6    +      -       -      +
    198B  LEU      3.3     0.4    -      -       -      -
    199B  GLN*     3.5    21.1    -      -       -      +
    200B  SER*     3.1    26.9    +      -       -      -
    488B  GLN      3.8    18.6    -      -       -      -
    489B  THR*     3.3    18.8    -      -       -      -
    490B  SER      3.5     8.5    -      -       -      -
    491B  MET*     3.2    62.8    -      -       +      +
----------------------------------------------------------
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Residues in contact with ARG 197 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    216A  VAL*     3.4    32.1    -      -       +      +
    261A  ASP      3.3    12.1    +      -       -      -
    262A  PHE*     3.6    20.0    -      -       +      +
    263A  GLU*     4.9     5.5    +      -       -      +
     83B  GLN*     2.9    39.7    +      -       -      +
     84B  GLN*     4.6    12.3    -      -       -      +
    193B  GLN*     2.9    53.4    +      -       -      +
    194B  ALA      4.1     2.9    -      -       -      +
    196B  PHE*     1.3    75.7    -      -       -      +
    198B  LEU*     1.3    60.8    +      -       -      +
    200B  SER*     3.6     8.4    -      -       -      -
    201B  GLY      3.4     8.7    +      -       -      -
    321B  PHE*     3.2    20.4    -      -       +      -
    324B  GLU*     4.3    14.6    -      -       +      -
----------------------------------------------------------
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Residues in contact with LEU 198 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    194B  ALA      3.1    19.1    +      -       -      +
    195B  VAL*     3.4     3.8    -      -       -      +
    197B  ARG*     1.3    75.8    -      -       -      +
    199B  GLN*     1.3    61.0    +      -       -      +
    201B  GLY*     2.9    15.8    +      -       -      -
    202B  ILE*     3.0    18.1    +      -       +      +
    317B  LEU*     3.9    30.3    -      -       +      +
    321B  PHE*     3.8    23.1    -      -       +      +
    324B  GLU*     4.3     8.5    -      -       +      +
    325B  ILE*     3.6    32.3    -      -       +      +
    477B  THR*     4.1    20.6    -      -       +      -
    480B  PHE*     4.5     2.2    -      -       +      -
    481B  LEU*     4.1    20.4    -      -       +      -
----------------------------------------------------------
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Residues in contact with GLN 199 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    219A  GLN*     4.9     8.1    -      -       +      +
    195B  VAL      2.9    16.1    +      -       -      +
    196B  PHE*     3.5    27.5    -      -       -      +
    197B  ARG      3.4     0.2    -      -       -      -
    198B  LEU*     1.3    72.5    -      -       -      +
    200B  SER*     1.3    64.0    +      -       -      +
    202B  ILE*     3.1    18.2    +      -       -      +
    203B  CYS*     3.3    12.0    +      -       -      -
    473B  LEU*     3.6    28.5    -      -       +      +
    474B  GLU*     3.7    16.9    -      -       -      +
    477B  THR*     3.3    32.6    +      -       +      +
    489B  THR*     2.7    27.7    +      -       -      +
    491B  MET*     5.2     3.6    +      -       -      +
----------------------------------------------------------
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Residues in contact with SER 200 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    211A  ILE*     5.6     5.0    -      -       -      +
    215A  PHE      4.8     1.7    +      -       -      -
    216A  VAL*     3.7    13.2    -      -       -      +
    217A  GLU*     3.0    48.4    +      -       -      +
    219A  GLN*     6.1     0.2    -      -       -      +
    196B  PHE      3.1    15.6    +      -       -      -
    197B  ARG      3.6     8.3    -      -       -      -
    199B  GLN*     1.3    73.6    -      -       -      +
    201B  GLY*     1.3    61.6    +      -       -      +
    203B  CYS*     3.5     8.6    +      -       -      +
    204B  HIS*     3.1    22.2    +      -       -      +
----------------------------------------------------------
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Residues in contact with GLY 201 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    197B  ARG      3.4     4.8    +      -       -      -
    198B  LEU      2.9    10.2    +      -       -      -
    200B  SER*     1.3    75.3    +      -       -      +
    202B  ILE*     1.3    53.8    -      -       -      +
    204B  HIS*     3.1     7.6    +      -       -      +
    205B  LEU*     2.8    44.7    +      -       -      +
    317B  LEU*     4.4     0.7    -      -       -      -
    321B  PHE*     3.5    29.4    -      -       -      -
----------------------------------------------------------
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Residues in contact with ILE 202 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    198B  LEU*     3.0    23.6    +      -       +      +
    199B  GLN*     3.1     7.8    +      -       -      +
    201B  GLY*     1.3    72.8    -      -       -      +
    203B  CYS*     1.3    54.6    +      -       -      +
    205B  LEU*     3.2     7.7    +      -       -      +
    206B  PHE*     2.7    36.0    +      -       -      +
    289B  LEU*     4.1    12.8    -      -       +      -
    313B  ILE*     4.2    21.4    -      -       +      +
    317B  LEU*     3.7    24.8    -      -       +      +
    471B  ILE*     5.6     0.9    -      -       +      -
    473B  LEU*     3.6    16.6    -      -       +      -
    476B  VAL*     4.0    20.4    -      -       +      -
    477B  THR*     3.4    37.0    -      -       -      +
    480B  PHE*     5.5     1.3    -      -       +      -
----------------------------------------------------------
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Residues in contact with CYS 203 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    217A  GLU*     3.1    20.9    -      -       -      +
    219A  GLN*     3.4    28.5    -      -       -      -
    199B  GLN      3.3     6.6    +      -       -      +
    200B  SER*     3.6     7.2    -      -       -      +
    201B  GLY      3.3     0.2    -      -       -      -
    202B  ILE*     1.3    78.7    -      -       -      +
    204B  HIS*     1.3    56.6    -      -       -      +
    206B  PHE*     3.5     5.1    -      -       -      +
    207B  ARG*     3.2    35.4    +      -       -      +
    268B  ILE*     3.9    21.6    -      -       +      +
    289B  LEU*     4.3     5.4    -      -       -      -
    473B  LEU*     3.5    27.1    -      -       -      -
----------------------------------------------------------
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Residues in contact with HIS 204 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    208A  GLU*     3.5    27.3    +      -       -      -
    211A  ILE*     3.3    47.4    -      -       +      +
    212A  ASN*     5.9     0.9    +      -       -      -
    217A  GLU*     4.8     0.6    +      -       -      +
    601A   ZN      3.5     6.8    -      -       -      -
    200B  SER*     3.1    12.9    +      -       -      +
    201B  GLY*     3.1    11.7    +      -       -      +
    203B  CYS*     1.3    73.5    -      -       -      +
    205B  LEU*     1.3    59.2    +      -       +      +
    207B  ARG*     3.3     8.2    +      -       -      +
    208B  GLU*     2.8    57.6    +      -       +      +
    320B  ARG*     3.8    25.9    +      -       -      -
    321B  PHE*     6.3     2.5    -      +       -      -
----------------------------------------------------------
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Residues in contact with LEU 205 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    201B  GLY*     2.8    24.4    +      -       -      +
    202B  ILE      3.7     2.9    -      -       -      +
    204B  HIS*     1.3    71.8    -      -       +      +
    206B  PHE*     1.3    59.7    +      -       -      +
    208B  GLU*     4.3     5.5    -      -       +      +
    209B  THR*     2.6    38.7    +      -       -      +
    312B  GLN      4.6     4.0    -      -       -      +
    313B  ILE*     3.3    40.1    -      -       +      +
    316B  GLY*     3.7    13.5    -      -       -      -
    317B  LEU*     3.7    28.7    -      -       +      +
    320B  ARG*     3.9    35.2    -      -       -      +
    321B  PHE*     4.8     5.6    -      -       +      -
----------------------------------------------------------
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Residues in contact with PHE 206 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    202B  ILE      2.7    20.4    +      -       -      +
    203B  CYS      3.5     4.5    -      -       -      +
    204B  HIS      3.2     0.2    -      -       -      -
    205B  LEU*     1.3    73.6    -      -       -      +
    207B  ARG*     1.3    61.9    +      -       -      +
    209B  THR*     3.7     2.6    -      -       -      -
    210B  LEU*     3.3    52.4    +      -       +      +
    266B  PHE*     3.7    20.0    -      +       +      -
    268B  ILE*     3.8    21.1    -      -       +      -
    289B  LEU*     3.6    47.8    -      -       +      -
    290B  ASP      4.1     2.2    -      -       -      -
    291B  ILE*     3.7    30.1    -      -       +      -
    309B  THR*     4.2     7.8    -      -       +      +
    310B  MET*     5.7     0.9    -      -       -      -
    313B  ILE*     4.0    22.1    -      -       +      +
    471B  ILE*     4.3     9.9    -      -       +      -
----------------------------------------------------------
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Residues in contact with ARG 207 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    207A  ARG*     3.0    69.5    -      -       -      +
    211A  ILE*     5.0     2.8    -      -       -      +
    217A  GLU*     2.7    45.7    +      -       -      +
    266A  PHE*     4.6     2.2    -      -       -      -
    268A  ILE*     5.2     4.0    +      -       -      +
    601A   ZN      3.9    13.0    -      -       -      -
    203B  CYS*     3.2    15.8    +      -       -      +
    204B  HIS*     3.7     6.2    -      -       -      +
    206B  PHE*     1.3    73.2    -      -       -      +
    208B  GLU*     1.3    59.6    +      -       -      +
    209B  THR      3.1     1.6    -      -       -      -
    210B  LEU*     3.0     4.1    +      -       -      -
    211B  ILE*     2.7    45.6    +      -       +      +
    266B  PHE*     3.8    22.4    -      -       +      -
    268B  ILE*     3.3    31.5    -      -       +      +
----------------------------------------------------------
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Residues in contact with GLU 208 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    204A  HIS*     3.5    14.5    +      -       -      -
    208A  GLU*     2.9    38.3    -      -       -      +
    601A   ZN      3.7     1.6    -      -       -      -
    204B  HIS*     2.8    38.5    +      -       +      +
    205B  LEU*     4.3     6.7    -      -       +      +
    207B  ARG*     1.3    70.7    -      -       -      +
    209B  THR*     1.3    56.0    +      -       -      +
    211B  ILE*     4.2     4.9    -      -       -      +
    212B  ASN*     3.1    55.7    +      -       -      +
    320B  ARG*     5.7     6.7    -      -       -      +
----------------------------------------------------------
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Residues in contact with THR 209 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    205B  LEU*     2.6    25.3    +      -       -      +
    206B  PHE      3.7     4.5    -      -       -      -
    207B  ARG      3.0     0.4    +      -       -      -
    208B  GLU*     1.3    78.9    -      -       -      +
    210B  LEU*     1.3    60.6    +      -       -      +
    212B  ASN*     3.3     5.8    +      -       -      +
    213B  LYS*     3.2    37.2    +      -       -      +
    309B  THR*     3.4    40.4    +      -       -      +
    312B  GLN*     3.7    25.6    -      -       +      +
----------------------------------------------------------
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Residues in contact with LEU 210 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    206B  PHE*     3.3    50.5    +      -       +      +
    207B  ARG      3.0     5.8    +      -       -      +
    209B  THR*     1.3    72.2    -      -       -      +
    211B  ILE*     1.3    61.1    +      -       -      +
    213B  LYS*     2.9    21.3    +      -       +      +
    214B  GLY      3.1     8.8    +      -       -      -
    215B  PHE*     3.2    47.5    +      -       +      -
    266B  PHE*     3.7    23.3    -      -       +      -
    291B  ILE*     3.7    16.6    -      -       +      -
    305B  GLU*     6.2     1.8    -      -       +      -
    309B  THR*     3.4    29.2    -      -       +      +
----------------------------------------------------------
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Residues in contact with ILE 211 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    200A  SER*     5.6     4.9    -      -       -      +
    204A  HIS*     3.3    54.1    -      -       +      +
    207A  ARG*     5.1     3.8    -      -       -      +
    207B  ARG*     2.7    32.9    +      -       +      +
    208B  GLU*     4.2     2.9    -      -       -      +
    210B  LEU*     1.3    71.9    -      -       -      +
    212B  ASN*     1.3    61.5    +      -       -      +
    214B  GLY*     3.1    19.4    +      -       -      -
    215B  PHE      3.8    14.7    +      -       -      +
    217B  GLU*     5.6     2.7    -      -       +      +
    266B  PHE*     3.8    28.7    -      -       +      -
----------------------------------------------------------
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Residues in contact with ASN 212 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    204A  HIS*     6.1     0.2    -      -       -      -
    208B  GLU*     3.1    48.7    +      -       -      +
    209B  THR*     3.5     6.6    -      -       -      +
    210B  LEU      3.2     0.4    -      -       -      -
    211B  ILE*     1.3    80.5    -      -       -      +
    213B  LYS*     1.3    58.1    +      -       +      +
    214B  GLY      3.2     1.5    +      -       -      -
----------------------------------------------------------
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Residues in contact with LYS 213 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     47A  ARG*     4.9     1.6    +      -       -      -
    209B  THR*     3.2    25.5    +      -       +      +
    210B  LEU*     2.9    17.3    +      -       +      +
    212B  ASN*     1.3    76.1    -      -       +      +
    214B  GLY*     1.3    58.1    +      -       -      +
    215B  PHE*     4.2     7.9    -      -       +      -
    264B  LYS*     3.2    24.8    +      -       -      +
    305B  GLU*     3.1    39.9    +      -       +      +
    308B  ASP*     2.8    26.7    +      -       -      -
    309B  THR*     3.5    24.2    -      -       -      +
    312B  GLN*     5.4     0.4    -      -       -      +
----------------------------------------------------------
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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