Contacts of the helix formed by residues 185 - 211 (chain B) in PDB entry 4Y5U


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 GLU 185 (chain B).
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    140B  ARG*     3.5    31.9    +      -       -      +
    182B  LEU*     3.3    24.6    +      -       +      +
    183B  LEU      2.9     0.8    +      -       -      -
    184B  GLN*     1.3    74.7    -      -       -      +
    186B  THR*     1.3    58.9    +      -       -      +
    187B  THR*     3.2     2.7    -      -       -      -
    188B  GLY*     3.1     8.3    +      -       -      +
    189B  GLU*     3.0    37.5    +      -       -      +
    260B  ARG*     5.9     1.1    -      -       -      +
----------------------------------------------------------
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Residues in contact with THR 186 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    137B  LEU*     3.8    17.1    -      -       +      +
    140B  ARG*     3.7    36.7    +      -       +      -
    141B  VAL*     4.8     0.9    -      -       +      +
    144B  ILE*     5.2     2.2    -      -       +      -
    183B  LEU*     1.6    45.1    +      -       +      +
    184B  GLN*     4.0     4.5    -      -       -      -
    185B  GLU*     1.3    72.0    -      -       -      +
    187B  THR*     1.3    62.7    +      -       -      +
    189B  GLU*     3.5    10.4    +      -       -      +
    190B  LEU*     3.0    21.5    +      -       -      +
    238B  LEU*     4.3    22.0    -      -       +      +
----------------------------------------------------------
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Residues in contact with THR 187 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    184B  GLN*     3.6    29.8    +      -       +      +
    186B  THR*     1.3    78.4    -      -       -      +
    188B  GLY*     1.3    58.7    +      -       -      -
    190B  LEU*     3.3     8.4    -      -       -      +
    191B  GLU*     2.9    32.4    +      -       -      +
    238B  LEU*     3.8    14.4    -      -       +      -
    257B  LEU*     4.2     7.2    -      -       +      -
    260B  ARG*     2.6    35.2    +      -       -      +
    261B  LEU*     3.6    28.7    -      -       +      -
----------------------------------------------------------
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Residues in contact with GLY 188 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    185B  GLU*     3.1    11.2    +      -       -      +
    187B  THR*     1.3    77.6    +      -       -      +
    189B  GLU*     1.3    60.4    +      -       -      +
    190B  LEU      3.1     1.8    -      -       -      -
    191B  GLU*     3.5    16.0    -      -       -      +
    192B  ALA*     2.9    29.5    +      -       -      +
    260B  ARG*     4.5     3.5    -      -       -      +
----------------------------------------------------------
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Residues in contact with GLU 189 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    136B  ARG*     3.9    32.2    +      -       +      +
    137B  LEU*     4.0    17.1    -      -       +      +
    140B  ARG*     2.2    47.4    +      -       -      -
    185B  GLU*     3.0    24.3    +      -       -      +
    186B  THR*     3.5    12.0    -      -       -      +
    188B  GLY*     1.3    74.9    -      -       -      +
    190B  LEU*     1.3    59.0    +      -       -      +
    192B  ALA*     4.1     6.4    -      -       -      +
    193B  ALA*     3.7    17.7    +      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 190 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    137B  LEU*     3.7    15.4    -      -       +      +
    186B  THR      3.0    13.3    +      -       -      +
    187B  THR*     3.3    12.3    -      -       -      +
    188B  GLY      3.1     0.2    -      -       -      -
    189B  GLU*     1.3    76.1    -      -       -      +
    191B  GLU*     1.3    58.3    +      -       -      +
    192B  ALA      3.2     0.4    -      -       -      -
    193B  ALA*     3.3     3.4    +      -       -      +
    194B  LYS*     2.9    26.1    +      -       +      +
    231B  LEU*     3.8    28.5    -      -       +      +
    234B  ILE*     3.7    25.6    -      -       +      -
    235B  TYR*     4.5    14.8    -      -       +      -
    238B  LEU*     4.9     3.4    -      -       +      -
    261B  LEU*     4.4    20.0    -      -       +      -
    264B  VAL*     3.9    26.5    -      -       +      -
----------------------------------------------------------
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Residues in contact with GLU 191 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    187B  THR*     2.9    25.3    +      -       -      +
    188B  GLY*     3.1    12.2    +      -       -      +
    190B  LEU*     1.3    75.7    -      -       -      +
    192B  ALA*     1.3    60.6    +      -       -      +
    194B  LYS*     3.4    12.9    +      -       -      +
    195B  ALA*     3.1    23.2    +      -       -      +
    260B  ARG*     3.3    49.5    +      -       -      +
    261B  LEU*     6.1     0.7    -      -       +      -
    264B  VAL*     3.7    23.8    -      -       +      +
----------------------------------------------------------
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Residues in contact with ALA 192 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    188B  GLY      2.9    16.3    +      -       -      +
    189B  GLU*     4.1     7.9    -      -       -      +
    191B  GLU*     1.3    76.0    -      -       -      +
    193B  ALA*     1.3    60.5    +      -       -      +
    195B  ALA*     3.6     7.2    +      -       -      +
    196B  LEU*     3.2    22.8    +      -       -      +
----------------------------------------------------------
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Residues in contact with ALA 193 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    133B  GLY      6.6     0.2    -      -       -      -
    134B  LEU*     6.4     2.5    -      -       +      -
    137B  LEU*     4.6     3.8    -      -       +      -
    189B  GLU      3.7    13.7    +      -       -      +
    190B  LEU*     3.3    11.1    +      -       -      +
    192B  ALA*     1.3    77.3    -      -       -      +
    194B  LYS*     1.3    62.5    +      -       -      +
    196B  LEU*     3.2    27.1    -      -       +      +
    197B  VAL*     3.3     8.7    +      -       -      +
    231B  LEU*     3.7    30.8    -      -       +      +
----------------------------------------------------------
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Residues in contact with LYS 194 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    190B  LEU*     2.9    16.8    +      -       +      +
    191B  GLU*     3.6    10.6    +      -       -      +
    192B  ALA      3.3     0.2    -      -       -      -
    193B  ALA*     1.3    73.2    -      -       -      +
    195B  ALA*     1.3    67.9    +      -       -      +
    196B  LEU      3.0     1.5    +      -       -      -
    197B  VAL*     3.2     2.8    +      -       -      +
    198B  LEU*     3.2    34.8    +      -       +      +
    231B  LEU*     4.0     9.8    -      -       +      +
    263B  GLU*     5.1     2.0    +      -       -      +
    264B  VAL*     3.9    42.8    -      -       +      +
    267B  THR*     3.6    36.2    +      -       +      +
    268B  LEU*     4.3    16.4    -      -       +      +
----------------------------------------------------------
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Residues in contact with ALA 195 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    191B  GLU      3.1    13.2    +      -       -      +
    192B  ALA*     3.8     8.3    -      -       -      +
    193B  ALA      3.5     0.2    -      -       -      -
    194B  LYS*     1.3    85.6    -      -       -      +
    196B  LEU*     1.3    61.8    +      -       -      +
    198B  LEU*     3.5     9.8    +      -       -      +
    199B  LYS*     3.3    26.9    +      -       +      +
----------------------------------------------------------
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Residues in contact with LEU 196 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    130B  PHE*     5.7     7.2    -      -       +      +
    192B  ALA      3.2    11.5    +      -       -      +
    193B  ALA*     3.2    23.1    -      -       +      +
    195B  ALA*     1.3    82.3    -      -       -      +
    197B  VAL*     1.3    62.0    +      -       +      +
    199B  LYS*     3.3    23.9    -      -       +      +
    200B  ARG*     3.4     9.0    +      -       -      +
----------------------------------------------------------
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Residues in contact with VAL 197 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    193B  ALA      3.3    10.7    +      -       -      +
    194B  LYS      3.2     7.9    +      -       -      +
    196B  LEU*     1.3    76.6    -      -       +      +
    198B  LEU*     1.3    61.4    +      -       -      +
    199B  LYS      3.1     2.0    -      -       -      -
    200B  ARG*     3.1     8.1    +      -       +      +
    201B  ILE*     2.9    38.2    +      -       +      +
    224B  LEU*     4.6     9.9    -      -       +      +
    227B  ARG*     4.5    26.5    -      -       +      -
    228B  CYS*     4.0    26.7    -      -       -      -
    231B  LEU*     4.5    13.9    -      -       +      -
    268B  LEU*     4.3    11.7    -      -       +      -
----------------------------------------------------------
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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  LYS*     3.2    38.9    +      -       +      +
    195B  ALA*     3.7     9.0    -      -       -      +
    196B  LEU      3.3     0.2    -      -       -      -
    197B  VAL*     1.3    79.1    -      -       +      +
    199B  LYS*     1.3    57.3    +      -       -      +
    201B  ILE*     3.4     9.9    +      -       +      +
    202B  GLN*     3.1    31.6    +      -       -      +
    267B  THR*     3.8    24.9    -      -       +      +
    268B  LEU*     4.0    17.9    -      -       +      -
    271B  SER*     3.2    33.3    +      -       -      +
----------------------------------------------------------
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Residues in contact with LYS 199 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    195B  ALA*     3.3    16.1    +      -       +      +
    196B  LEU*     3.3    19.3    -      -       +      +
    198B  LEU*     1.3    77.1    -      -       -      +
    200B  ARG*     1.3    62.8    +      -       -      +
    202B  GLN*     3.5     9.0    +      -       +      +
    203B  ILE*     3.1    35.2    +      -       +      +
    435B  MET*     5.2     2.8    -      -       +      +
----------------------------------------------------------
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Residues in contact with ARG 200 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    196B  LEU      3.4     9.0    +      -       -      +
    197B  VAL*     3.1    12.5    +      -       +      +
    199B  LYS*     1.3    79.0    -      -       -      +
    201B  ILE*     1.3    62.6    +      -       -      +
    203B  ILE*     3.3    34.6    +      -       +      +
    204B  TRP*     3.1    26.0    +      -       -      +
    207B  GLN*     3.7     4.8    +      -       -      +
    219B  GLU*     2.5    43.5    +      -       -      -
    220B  SER      5.0     2.0    +      -       -      -
    223B  PRO*     5.5     6.7    -      -       -      +
    224B  LEU*     3.7    36.7    -      -       +      +
    227B  ARG*     4.5    18.1    -      -       -      +
----------------------------------------------------------
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Residues in contact with ILE 201 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    197B  VAL*     2.9    30.2    +      -       +      +
    198B  LEU*     3.5    11.4    -      -       +      +
    199B  LYS      3.2     0.2    -      -       -      -
    200B  ARG*     1.3    77.3    -      -       -      +
    202B  GLN*     1.3    58.7    +      -       -      +
    204B  TRP*     3.6     3.0    +      -       -      +
    205B  LYS*     3.0    36.9    +      -       -      +
    224B  LEU*     3.9    24.2    -      -       +      -
    228B  CYS*     4.9     3.8    -      -       -      -
    268B  LEU*     5.5     0.7    -      -       +      -
    271B  SER*     3.4    38.4    -      -       -      +
    272B  CYS*     5.0     0.9    -      -       -      -
    274B  LEU*     3.8    30.3    -      -       +      -
    296B  LEU*     4.7    14.1    -      -       +      -
----------------------------------------------------------
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Residues in contact with GLN 202 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    198B  LEU      3.1    16.5    +      -       -      +
    199B  LYS*     3.5    11.0    -      -       +      +
    200B  ARG      3.3     0.2    -      -       -      -
    201B  ILE*     1.3    74.0    -      -       -      +
    203B  ILE*     1.3    64.9    +      -       -      +
    205B  LYS*     3.4    30.1    +      -       -      +
    206B  ARG*     3.2    21.8    +      -       -      +
    271B  SER*     5.8     0.5    +      -       -      -
    435B  MET*     3.6    36.8    +      -       +      +
    436B  ASP*     3.4    24.2    +      -       -      +
----------------------------------------------------------
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Residues in contact with ILE 203 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    199B  LYS*     3.1    29.2    +      -       +      +
    200B  ARG*     3.3    32.5    +      -       +      +
    202B  GLN*     1.3    75.5    -      -       -      +
    204B  TRP*     1.3    56.4    +      -       -      +
    206B  ARG*     3.3     7.5    +      -       -      +
    207B  GLN*     3.1    39.8    +      -       -      +
    435B  MET*     4.6    12.1    -      -       +      -
----------------------------------------------------------
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Residues in contact with TRP 204 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    200B  ARG*     3.1    20.9    +      -       -      +
    201B  ILE*     3.8     4.9    -      -       +      +
    202B  GLN      3.3     0.2    -      -       -      -
    203B  ILE*     1.3    74.3    -      -       -      +
    205B  LYS*     1.3    75.0    +      -       +      +
    207B  GLN*     3.4     9.1    +      -       -      +
    208B  GLN*     2.9    60.1    +      -       -      +
    217B  PHE*     3.5    26.4    -      +       -      -
    219B  GLU*     3.3    44.4    +      -       +      +
    220B  SER      4.1     1.6    +      -       -      -
    221B  LEU*     3.2    50.1    -      -       +      +
    224B  LEU*     4.1     7.9    -      -       +      -
    274B  LEU*     4.8    11.4    -      -       +      -
    275B  VAL      4.1    11.2    -      -       -      -
    276B  GLU*     4.6     7.9    -      -       +      -
----------------------------------------------------------
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Residues in contact with LYS 205 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    201B  ILE*     3.0    24.5    +      -       -      +
    202B  GLN*     3.4    33.3    +      -       -      +
    204B  TRP*     1.3    89.4    -      -       +      +
    206B  ARG*     1.3    59.6    +      -       -      +
    208B  GLN*     3.7    10.5    -      -       -      +
    209B  GLN*     2.9    27.4    +      -       -      +
    274B  LEU*     3.6    24.8    -      -       +      +
    408B  LEU*     5.5     2.1    -      -       -      +
----------------------------------------------------------
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Residues in contact with ARG 206 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    202B  GLN      3.2    13.8    +      -       -      +
    203B  ILE*     3.7     8.1    -      -       -      +
    204B  TRP      3.3     0.4    -      -       -      -
    205B  LYS*     1.3    74.4    -      -       -      +
    207B  GLN*     1.3    63.7    +      -       -      +
    209B  GLN*     3.2    27.4    +      -       -      +
    210B  LEU*     3.1    45.5    +      -       +      +
    430B  ASN      3.2    18.8    +      -       -      -
    431B  ALA      2.9    23.4    +      -       -      -
    432B  PHE*     4.7     0.8    -      -       -      +
    433B  SER*     3.6    26.0    +      -       -      -
    435B  MET*     3.9    30.9    -      -       +      +
----------------------------------------------------------
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Residues in contact with GLN 207 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    200B  ARG*     3.7     6.7    +      -       -      +
    203B  ILE*     3.1    29.8    +      -       -      +
    204B  TRP*     3.5     9.5    -      -       -      +
    206B  ARG*     1.3    77.7    -      -       -      +
    208B  GLN*     1.3    56.7    +      -       -      +
    210B  LEU*     3.5     8.9    +      -       +      +
    211B  ALA*     3.2    24.3    +      -       -      +
    215B  ALA*     5.3     1.7    -      -       -      +
    216B  PRO      5.6     5.0    -      -       -      +
    217B  PHE*     3.7    18.1    -      -       +      +
    219B  GLU*     2.9    34.0    +      -       +      +
----------------------------------------------------------
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Residues in contact with GLN 208 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    204B  TRP*     2.9    38.7    +      -       +      +
    205B  LYS*     3.7    11.5    -      -       -      +
    207B  GLN*     1.3    74.3    -      -       -      +
    209B  GLN*     1.3    64.6    +      -       -      +
    211B  ALA*     3.5     9.9    +      -       -      +
    212B  GLY*     3.5     8.3    +      -       -      -
    217B  PHE*     3.5    30.0    -      -       +      -
    275B  VAL      3.3    22.4    +      -       -      +
    276B  GLU      3.8    11.9    +      -       -      -
    278B  GLN*     3.6    34.9    +      -       +      +
    408B  LEU*     4.4     7.6    -      -       -      +
----------------------------------------------------------
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Residues in contact with GLN 209 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    205B  LYS      2.9    17.7    +      -       -      +
    206B  ARG*     3.2    34.0    +      -       -      +
    208B  GLN*     1.3    77.6    -      -       -      +
    210B  LEU*     1.3    60.4    +      -       -      +
    212B  GLY*     3.1    10.4    +      -       -      -
    408B  LEU*     3.8    32.6    -      -       +      +
    429B  ASP*     3.8     8.6    +      -       -      -
    430B  ASN*     3.5    38.0    +      -       -      +
    433B  SER*     3.7    25.2    +      -       -      -
    434B  GLU      5.4     1.6    -      -       -      +
    435B  MET*     5.9     0.7    -      -       -      -
    437B  ARG*     4.0    14.6    -      -       -      +
----------------------------------------------------------
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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  ARG*     3.1    53.8    +      -       +      +
    207B  GLN*     4.0     7.9    -      -       +      +
    209B  GLN*     1.3    72.0    -      -       -      +
    211B  ALA*     1.3    61.1    +      -       -      +
    212B  GLY      3.0     4.9    -      -       -      -
    213B  ASN*     3.1    20.9    +      -       +      +
    215B  ALA*     3.3    27.1    +      -       +      +
    430B  ASN      3.6    17.9    -      -       -      +
    431B  ALA*     4.0    11.0    -      -       +      +
    453B  GLU*     5.7     4.5    -      -       -      +
    454B  THR*     5.5     3.1    -      -       -      +
    457B  LEU*     6.5     1.6    -      -       +      -
----------------------------------------------------------
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Residues in contact with ALA 211 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    207B  GLN      3.2    17.3    +      -       -      +
    208B  GLN*     3.6     8.5    -      -       +      +
    209B  GLN      3.2     0.2    -      -       -      -
    210B  LEU*     1.3    71.1    -      -       -      +
    212B  GLY*     1.3    58.8    +      -       -      +
    213B  ASN      3.0     5.7    +      -       -      -
    214B  GLY*     3.3    10.4    +      -       -      -
    215B  ALA*     3.7    17.1    -      -       -      +
    217B  PHE*     3.6    32.3    -      -       +      -
----------------------------------------------------------
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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