Contacts of the helix formed by residues 196 - 220 (chain B) in PDB entry 6R7X


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 PRO 196 (chain B).
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    182B  LEU*     4.9     5.2    -      -       +      -
    185B  THR*     3.3    41.7    -      -       -      +
    186B  TRP*     4.5     9.0    -      -       +      +
    193B  LYS*     4.0     3.1    -      -       -      +
    194B  TYR      3.6     6.3    -      -       -      +
    195B  GLN*     1.3    86.6    -      -       +      +
    197B  ILE*     1.3    66.0    +      -       -      +
    198B  ASP      3.2     3.1    +      -       -      +
    199B  SER*     3.4    11.6    +      -       -      +
    200B  ILE*     3.1    29.3    +      -       +      +
----------------------------------------------------------
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Residues in contact with ILE 197 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    195B  GLN*     3.0    21.8    +      -       +      +
    196B  PRO*     1.3    73.0    -      -       -      +
    198B  ASP*     1.3    59.5    +      -       -      +
    200B  ILE*     3.7     8.7    -      -       +      +
    201B  ARG*     2.9    27.5    +      -       -      +
    209B  ALA*     3.5    26.9    -      -       +      +
    212B  PHE*     5.3     0.9    -      -       +      -
    213B  GLY*     4.1    13.9    -      -       -      +
    216B  GLU*     4.0    21.1    -      -       -      +
    268B  MET*     3.9    22.4    -      -       +      -
    271B  ARG*     5.1     7.2    -      -       -      +
    272B  TRP*     3.7    19.2    -      -       +      -
----------------------------------------------------------
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Residues in contact with ASP 198 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    196B  PRO      3.2     0.8    -      -       -      -
    197B  ILE*     1.3    79.1    -      -       -      +
    199B  SER*     1.3    57.6    +      -       -      +
    201B  ARG*     3.3     7.9    +      -       -      +
    202B  GLY*     2.9    23.2    +      -       -      -
    271B  ARG*     2.9    31.2    +      -       -      +
    272B  TRP*     2.9    28.8    +      -       -      -
----------------------------------------------------------
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Residues in contact with SER 199 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    181B  LYS      5.5     0.2    +      -       -      -
    182B  LEU*     3.3    27.6    -      -       -      +
    185B  THR*     5.4     2.6    +      -       -      -
    196B  PRO*     3.4    15.8    +      -       -      +
    198B  ASP*     1.3    74.8    -      -       -      +
    200B  ILE*     1.3    61.1    +      -       -      +
    202B  GLY*     3.3     3.0    +      -       -      +
    203B  TYR*     3.0    30.5    +      -       -      +
----------------------------------------------------------
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Residues in contact with ILE 200 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    182B  LEU*     4.0    16.4    -      -       +      +
    186B  TRP*     3.4    47.3    -      -       +      +
    195B  GLN*     4.0    12.6    -      -       +      -
    196B  PRO*     3.1    25.8    +      -       +      +
    197B  ILE*     3.7     8.1    -      -       +      +
    199B  SER*     1.3    74.9    -      -       -      +
    201B  ARG*     1.3    56.8    +      -       -      +
    204B  PHE*     2.9    36.8    +      -       +      +
    205B  GLY      4.0     0.3    -      -       -      +
    208B  ILE      4.5     1.1    -      -       -      -
    209B  ALA*     3.8    25.8    -      -       -      +
    212B  PHE*     4.3    23.1    -      -       +      -
----------------------------------------------------------
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Residues in contact with ARG 201 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     89B  VAL      5.8     0.4    +      -       -      -
     90B  LYS*     5.1     7.9    -      -       -      +
    120B  THR*     6.2     1.8    -      -       -      +
    122B  ALA*     4.8     1.4    -      -       -      +
    123B  GLU*     3.4    26.7    +      -       -      +
    197B  ILE      2.9    19.5    +      -       -      +
    198B  ASP*     3.4     6.7    -      -       -      +
    199B  SER      3.2     0.2    -      -       -      -
    200B  ILE*     1.3    77.2    -      -       -      +
    202B  GLY*     1.3    64.9    +      -       -      +
    205B  GLY*     2.9    42.8    +      -       -      +
    206B  GLU*     3.0    29.2    +      -       +      +
    209B  ALA*     3.7     8.3    -      -       +      -
    272B  TRP*     3.6    60.9    +      -       +      +
----------------------------------------------------------
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Residues in contact with GLY 202 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    120B  THR*     3.8    24.9    +      -       -      +
    121B  MET      5.1     0.3    +      -       -      -
    122B  ALA*     3.7    14.8    +      -       -      +
    198B  ASP      2.9    15.3    +      -       -      -
    199B  SER*     3.3     4.0    +      -       -      -
    201B  ARG*     1.3    85.5    -      -       -      +
    203B  TYR*     1.3    58.4    +      -       -      +
    543B  ARG*     4.6     0.5    +      -       -      -
----------------------------------------------------------
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Residues in contact with TYR 203 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    121B  MET*     6.2     0.2    -      -       +      -
    122B  ALA*     3.7     4.1    -      -       -      +
    174B  HIS*     2.8    29.1    +      +       -      -
    175B  ASP*     3.0    36.6    +      -       +      -
    178B  ALA*     4.5    16.2    -      -       +      -
    179B  LEU*     3.6    26.7    -      -       +      +
    182B  LEU*     4.0    18.2    -      -       +      -
    199B  SER      3.0    16.8    +      -       -      +
    200B  ILE      4.2     0.4    -      -       -      +
    202B  GLY*     1.3    79.3    -      -       -      +
    204B  PHE*     1.3    88.3    +      +       +      +
    205B  GLY      3.7     0.9    -      -       -      -
    543B  ARG*     2.9    52.4    +      -       -      +
----------------------------------------------------------
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Residues in contact with PHE 204 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    174B  HIS*     4.3     5.6    -      +       -      -
    179B  LEU*     4.5     4.0    -      -       +      -
    182B  LEU*     3.9     5.2    -      -       +      -
    186B  TRP*     3.6    36.3    -      +       -      -
    200B  ILE*     2.9    23.8    +      -       +      +
    203B  TYR*     1.3   110.6    -      +       +      +
    205B  GLY*     1.3    63.9    +      -       -      +
    207B  THR      5.0     0.3    +      -       -      -
    208B  ILE*     3.5    33.9    -      -       +      +
    537B  MET*     3.3    37.7    -      -       +      -
    543B  ARG*     4.8     2.5    -      -       +      -
    544B  PRO*     3.8    40.4    -      -       +      +
    545B  PHE      5.0     0.5    -      -       -      +
    546B  SER*     4.4     9.7    -      -       -      -
    547B  GLU      5.3     0.2    +      -       -      -
----------------------------------------------------------
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Residues in contact with GLY 205 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    122B  ALA*     4.2     2.9    -      -       -      +
    200B  ILE      4.0     0.2    -      -       -      +
    201B  ARG*     2.9    30.4    +      -       -      +
    203B  TYR      3.7     1.4    -      -       -      -
    204B  PHE*     1.3    83.2    -      -       -      +
    206B  GLU*     1.3    68.4    +      -       -      -
    207B  THR      3.7     0.4    -      -       -      -
    209B  ALA*     3.6     7.2    +      -       -      +
    546B  SER*     3.7    29.1    +      -       -      -
    547B  GLU      4.7     0.2    -      -       -      -
----------------------------------------------------------
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Residues in contact with GLU 206 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    123B  GLU*     5.8     2.3    -      -       -      +
    201B  ARG*     3.0    37.7    +      -       +      +
    205B  GLY*     1.3    79.1    -      -       -      -
    207B  THR*     1.3    61.6    +      -       -      +
    208B  ILE      3.4     0.7    -      -       -      -
    209B  ALA*     3.5     4.6    +      -       -      +
    210B  LEU*     2.9    30.7    +      -       -      +
    272B  TRP*     3.6    29.0    -      -       +      +
    274B  THR*     3.6    23.0    -      -       +      +
    546B  SER*     5.3     2.6    -      -       -      -
    547B  GLU      3.7    10.1    +      -       -      +
    548B  PRO*     3.8    17.8    -      -       -      +
    549B  SER*     4.2    15.7    -      -       -      +
----------------------------------------------------------
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Residues in contact with THR 207 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    204B  PHE      5.0     0.2    +      -       -      -
    205B  GLY      3.7     0.2    -      -       -      -
    206B  GLU*     1.3    74.3    -      -       -      +
    208B  ILE*     1.3    65.5    +      -       +      +
    210B  LEU*     3.3     6.3    +      -       +      +
    211B  TYR*     3.0    27.1    +      -       -      +
    494B  THR*     3.5    28.0    -      -       +      +
    498B  TYR*     4.7     2.8    +      -       +      +
    547B  GLU*     2.8    34.3    +      -       +      +
    549B  SER*     3.2    25.0    +      -       -      +
----------------------------------------------------------
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Residues in contact with ILE 208 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    200B  ILE*     4.5     0.9    -      -       +      -
    204B  PHE*     3.5    39.0    +      -       +      +
    206B  GLU      3.4     0.2    -      -       -      -
    207B  THR*     1.3    79.6    -      -       +      +
    209B  ALA*     1.3    56.6    +      -       -      +
    211B  TYR*     3.3     8.5    +      -       +      +
    212B  PHE*     2.9    59.7    +      -       +      -
    491B  TYR*     3.6    34.3    -      -       +      +
    494B  THR*     3.8    10.1    -      -       +      -
    537B  MET*     3.9    21.1    -      -       +      -
    544B  PRO*     4.3    13.5    -      -       +      -
    545B  PHE      6.0     0.9    -      -       -      +
----------------------------------------------------------
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Residues in contact with ALA 209 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    197B  ILE*     3.5    15.8    -      -       +      +
    200B  ILE*     3.8    13.3    -      -       +      +
    201B  ARG*     3.7    23.3    -      -       +      +
    205B  GLY      3.6    18.9    +      -       -      +
    206B  GLU      3.5     3.4    +      -       -      +
    207B  THR      3.3     0.6    -      -       -      -
    208B  ILE*     1.3    76.4    -      -       -      +
    210B  LEU*     1.3    59.1    +      -       -      +
    212B  PHE      3.8     0.6    -      -       -      +
    213B  GLY*     2.9    23.9    +      -       -      -
    272B  TRP*     3.6    22.0    -      -       +      -
----------------------------------------------------------
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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  GLU      2.9    15.2    +      -       -      +
    207B  THR*     3.3     6.2    +      -       +      +
    209B  ALA*     1.3    74.1    -      -       -      +
    211B  TYR*     1.3    61.3    +      -       -      +
    213B  GLY*     3.5     1.1    +      -       -      -
    214B  PHE*     2.9    29.3    +      -       -      +
    261B  TRP*     3.8     9.7    -      -       +      -
    265B  CYS*     4.3     7.6    -      -       -      -
    268B  MET*     3.9    20.9    -      -       +      -
    269B  THR*     3.9    13.0    -      -       +      -
    272B  TRP*     3.7    21.7    -      -       +      -
    498B  TYR*     3.8     4.8    +      -       -      +
    549B  SER*     4.1    14.8    -      -       -      +
    550B  ALA      4.3     1.6    -      -       -      -
    551B  ASN*     3.4    44.4    -      -       -      +
    552B  ILE*     4.1     4.5    -      -       +      +
----------------------------------------------------------
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Residues in contact with TYR 211 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    207B  THR      3.0    14.6    +      -       -      +
    208B  ILE*     3.6     7.2    -      -       +      +
    209B  ALA      3.3     0.2    -      -       -      -
    210B  LEU*     1.3    77.1    -      -       -      +
    212B  PHE*     1.3    89.2    +      +       -      +
    214B  PHE*     3.2     1.7    +      -       -      +
    215B  LEU*     2.9    38.9    +      -       +      +
    491B  TYR*     5.0     2.0    -      -       -      -
    494B  THR*     4.2    17.9    -      -       +      -
    497B  ASP*     3.2    41.1    +      -       +      +
    498B  TYR*     3.3    34.4    +      +       +      +
    501B  LEU*     4.1    14.0    -      -       +      +
    529B  GLU*     4.6     1.4    -      -       -      +
    533B  ASP*     2.3    35.8    +      -       +      -
    903B   CA      3.4     6.8    -      -       -      -
----------------------------------------------------------
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Residues in contact with PHE 212 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    186B  TRP*     3.6    28.9    -      +       -      -
    195B  GLN*     3.1    41.7    -      -       -      +
    197B  ILE*     5.3     2.0    -      -       +      -
    200B  ILE*     4.3    15.7    -      -       +      -
    208B  ILE*     2.9    47.2    +      -       +      +
    209B  ALA      4.1     2.5    -      -       -      +
    211B  TYR*     1.3    89.6    -      +       -      +
    213B  GLY*     1.3    57.8    +      -       -      +
    215B  LEU*     3.8    13.5    -      -       +      +
    216B  GLU*     2.9    23.2    +      -       -      +
    530B  VAL      4.1     5.2    -      -       -      -
    533B  ASP*     3.7    22.4    -      -       +      -
    534B  ALA*     3.6    25.8    -      -       -      -
    537B  MET*     3.9     9.0    -      -       +      -
----------------------------------------------------------
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Residues in contact with GLY 213 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    197B  ILE*     4.1    25.4    -      -       -      +
    209B  ALA      2.9    18.2    +      -       -      -
    210B  LEU      3.9     1.3    -      -       -      -
    212B  PHE*     1.3    76.1    -      -       -      +
    214B  PHE*     1.3    57.3    +      -       -      +
    216B  GLU*     3.4     5.7    +      -       -      +
    217B  TYR*     2.9    29.5    +      -       -      +
    261B  TRP*     3.9     7.5    -      -       -      -
    268B  MET*     4.5     7.4    -      -       -      +
----------------------------------------------------------
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Residues in contact with PHE 214 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    210B  LEU      2.9    18.5    +      -       -      +
    211B  TYR      3.2     2.9    +      -       -      +
    213B  GLY*     1.3    76.1    -      -       -      +
    215B  LEU*     1.3    57.9    +      -       -      +
    217B  TYR*     3.7     4.9    -      +       -      +
    218B  PHE*     2.8    43.4    +      +       +      +
    258B  LEU*     5.2     7.6    -      -       +      -
    261B  TRP*     3.5    54.9    -      +       +      -
    498B  TYR*     3.5    27.8    -      +       +      +
    501B  LEU*     3.7    23.1    -      -       +      -
    552B  ILE*     4.6     7.4    -      -       +      -
    559B  PHE*     3.8    42.0    -      +       -      -
----------------------------------------------------------
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Residues in contact with LEU 215 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    211B  TYR*     2.9    38.7    +      -       +      +
    212B  PHE*     3.8    15.7    -      -       +      +
    214B  PHE*     1.3    75.2    -      -       -      +
    216B  GLU*     1.3    57.0    +      -       -      +
    218B  PHE*     4.5     1.3    -      -       +      -
    219B  THR*     2.6    46.0    +      -       -      +
    501B  LEU*     3.7    37.9    -      -       +      -
    526B  ASN*     4.1    13.5    -      -       +      +
    529B  GLU*     4.2    10.5    -      -       +      +
    530B  VAL*     3.7    38.1    -      -       +      +
    533B  ASP*     4.2     2.7    -      -       -      +
----------------------------------------------------------
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Residues in contact with GLU 216 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    193B  LYS      5.6     1.1    -      -       -      +
    194B  TYR*     4.5     8.2    -      -       -      -
    195B  GLN*     3.3    43.0    +      -       +      +
    197B  ILE*     4.0    17.4    -      -       +      +
    212B  PHE      2.9    11.0    +      -       -      +
    213B  GLY*     3.8     7.6    -      -       -      +
    215B  LEU*     1.3    77.1    -      -       -      +
    217B  TYR*     1.3    66.5    +      -       -      +
    219B  THR*     3.9     5.5    -      -       -      -
    220B  PHE*     3.2    56.3    +      -       +      -
    530B  VAL*     5.1     3.8    -      -       +      -
----------------------------------------------------------
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Residues in contact with TYR 217 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    213B  GLY      2.9    17.5    +      -       -      +
    214B  PHE*     3.7     8.7    -      +       -      +
    216B  GLU*     1.3    82.3    +      -       -      +
    218B  PHE*     1.3    63.9    +      +       -      +
    220B  PHE*     3.2    10.2    +      -       +      +
    221B  ALA*     3.0    31.4    +      -       +      +
    257B  ILE*     3.1    50.7    +      -       +      +
    260B  LEU*     3.2    27.1    -      -       +      +
    261B  TRP*     3.6    39.3    -      +       +      -
----------------------------------------------------------
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Residues in contact with PHE 218 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    214B  PHE*     2.8    39.5    +      +       +      +
    215B  LEU*     4.0     5.4    -      -       -      +
    217B  TYR*     1.3    76.3    -      +       -      +
    219B  THR*     1.3    63.5    +      -       -      +
    221B  ALA*     3.8     3.5    -      -       -      +
    222B  LEU*     3.5    51.0    +      -       +      +
    257B  ILE*     4.7    14.1    -      -       +      -
    258B  LEU*     6.1     3.1    -      -       +      -
    501B  LEU*     4.0    37.0    -      -       +      -
    504B  GLN*     4.7     4.5    -      -       +      -
    505B  PHE*     3.6    50.7    -      +       +      -
    526B  ASN*     4.0     8.0    +      -       -      -
    559B  PHE*     4.3     9.2    -      +       -      -
----------------------------------------------------------
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Residues in contact with THR 219 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    215B  LEU*     2.6    26.1    +      -       -      +
    216B  GLU*     3.9     7.0    -      -       -      -
    217B  TYR      3.2     0.2    -      -       -      -
    218B  PHE*     1.3    79.3    -      -       -      +
    220B  PHE*     1.3    63.8    +      -       +      +
    221B  ALA      3.2     3.5    +      -       -      -
    222B  LEU*     3.7     7.1    +      -       -      +
    223B  ILE*     3.3    18.4    +      -       -      +
    523B  VAL*     4.5     7.7    -      -       +      +
    526B  ASN*     3.3    34.0    +      -       +      +
    527B  PHE*     3.6    36.8    -      -       +      -
    530B  VAL*     4.1     8.8    -      -       +      +
----------------------------------------------------------
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Residues in contact with PHE 220 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    192B  LEU*     3.7    42.6    -      -       +      -
    193B  LYS      4.6     8.1    -      -       -      -
    194B  TYR*     3.9    23.8    -      +       -      -
    216B  GLU*     3.2    44.7    +      -       +      +
    217B  TYR*     3.2    13.1    +      -       +      +
    219B  THR*     1.3    79.9    -      -       +      +
    221B  ALA*     1.3    55.7    +      -       -      +
    222B  LEU      3.7     0.2    -      -       -      -
    223B  ILE*     3.6    23.8    -      -       +      +
    224B  PRO*     4.4     7.8    -      -       -      +
    253B  TRP*     5.1     2.3    -      -       -      -
    527B  PHE*     4.5    10.8    -      +       -      -
----------------------------------------------------------
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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