Contacts of the helix formed by residues 167 - 191 (chain B) in PDB entry 6N1G


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 167 (chain B).
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    162B  LEU*     3.4    14.9    -      -       -      +
    166B  MET*     1.3    77.0    -      -       -      +
    168B  LEU*     1.3    73.8    +      -       -      +
    169B  TRP*     3.1    56.8    -      -       +      -
    170B  ARG*     3.1    20.1    +      -       +      +
    171B  GLY      3.1    10.2    +      -       -      -
    251B  GLU*     5.5     6.3    -      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 168 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    162B  LEU*     4.4     0.4    -      -       -      +
    167B  THR*     1.3    82.8    +      -       -      +
    169B  TRP*     1.3    68.4    +      -       +      +
    171B  GLY*     3.1    12.3    +      -       -      -
    172B  PHE*     3.4    22.1    +      -       +      -
    251B  GLU*     4.3     9.8    -      -       +      +
    252B  ASN*     2.8    34.8    -      -       +      +
    253B  TRP*     4.0    30.1    -      -       +      +
    255B  TRP*     5.1    10.1    -      -       +      -
    256B  VAL*     4.5    12.4    -      -       +      +
----------------------------------------------------------
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Residues in contact with TRP 169 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    167B  THR*     3.1    39.3    -      -       +      +
    168B  LEU*     1.3    84.5    -      -       +      +
    170B  ARG*     1.3    77.9    +      -       +      +
    172B  PHE*     3.7    12.8    -      -       -      +
    173B  LEU*     3.6    19.2    +      -       -      +
----------------------------------------------------------
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Residues in contact with ARG 170 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    165B  HIS      5.1     0.2    +      -       -      -
    166B  MET*     3.7    25.7    -      -       +      +
    167B  THR*     3.1    33.5    +      -       +      +
    169B  TRP*     1.3    91.1    -      -       -      +
    171B  GLY*     1.3    63.9    +      -       -      +
    173B  LEU*     3.6     9.0    +      -       -      +
    174B  ASN*     3.2    22.5    +      -       -      +
    132D  SER      3.7    12.7    +      -       -      -
    133D  LEU*     3.7    15.9    +      -       -      +
    135D  TYR*     3.3    45.0    -      -       -      +
    136D  THR*     2.8    31.5    +      -       -      +
----------------------------------------------------------
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Residues in contact with GLY 171 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    162B  LEU*     4.6     0.4    -      -       -      -
    166B  MET*     4.7     1.0    -      -       -      -
    167B  THR      3.1    10.7    +      -       -      -
    168B  LEU      3.1     2.4    +      -       -      -
    170B  ARG*     1.3    75.2    -      -       -      +
    172B  PHE*     1.3    53.1    +      -       -      +
    174B  ASN*     3.1     2.6    +      -       -      +
    175B  GLU*     2.6    38.8    +      -       -      +
    221B  THR*     3.7    10.8    -      -       -      -
    253B  TRP*     3.6    27.4    -      -       -      -
    256B  VAL*     3.6     7.0    -      -       -      -
----------------------------------------------------------
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Residues in contact with PHE 172 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    168B  LEU*     3.4    21.0    +      -       +      -
    169B  TRP*     3.7    14.8    -      -       -      +
    170B  ARG      3.3     0.4    -      -       -      -
    171B  GLY*     1.3    73.6    -      -       -      +
    173B  LEU*     1.3    66.3    +      -       -      +
    175B  GLU      2.9     0.9    +      -       -      -
    176B  ALA*     2.7    28.9    +      -       +      +
    255B  TRP*     4.2    16.4    -      +       -      -
    256B  VAL*     3.4    21.9    -      -       +      +
    259B  VAL*     3.1    36.8    -      -       +      -
    260B  ALA*     3.8    18.6    -      -       +      -
    263B  LEU*     4.4    29.4    -      -       +      -
----------------------------------------------------------
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Residues in contact with LEU 173 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    169B  TRP      3.6     9.9    +      -       -      +
    170B  ARG*     4.0     9.6    -      -       -      +
    171B  GLY      3.4     0.4    -      -       -      -
    172B  PHE*     1.3    79.7    -      -       -      +
    174B  ASN*     1.3    62.0    -      -       -      +
    176B  ALA*     4.3     2.9    -      -       -      +
    177B  TRP*     3.1    34.6    +      -       +      +
    129D  THR*     4.9     8.5    -      -       +      -
    132D  SER*     5.4    14.8    -      -       -      +
    133D  LEU*     2.8    36.6    -      -       +      -
----------------------------------------------------------
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Residues in contact with ASN 174 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    166B  MET*     5.5     2.0    -      -       +      -
    170B  ARG      3.2    14.1    +      -       -      +
    171B  GLY      3.1     6.7    +      -       -      +
    172B  PHE      3.0     0.6    -      -       -      -
    173B  LEU*     1.3    78.6    -      -       -      +
    175B  GLU*     1.3    61.5    +      -       -      +
    177B  TRP*     4.1     1.2    -      -       -      +
    178B  LEU*     3.2    37.3    +      -       -      +
    217B  LEU*     3.4    33.1    -      -       -      +
    220B  ASN*     3.4    24.4    -      -       +      +
    221B  THR*     2.5    37.9    +      -       +      +
    133D  LEU*     3.8    14.9    -      -       +      +
----------------------------------------------------------
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Residues in contact with GLU 175 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    171B  GLY      2.6    21.7    +      -       -      +
    174B  ASN*     1.3    71.0    -      -       -      +
    176B  ALA*     1.3    60.1    +      -       -      +
    178B  LEU*     4.9     3.6    -      -       -      +
    179B  THR*     3.0    41.8    +      -       -      -
    221B  THR*     2.9    28.0    +      -       +      +
    223B  TYR*     3.8     2.6    -      -       -      -
    224B  ALA*     2.8    55.3    +      -       +      +
    225B  ILE*     3.9     2.8    +      -       -      +
    253B  TRP*     5.7     0.4    -      -       +      -
    256B  VAL*     4.3    17.0    -      -       +      +
    257B  PRO*     5.2     1.6    -      -       +      -
    260B  ALA*     3.4    20.8    -      -       +      +
    261B  PRO*     4.0     2.7    -      -       +      +
----------------------------------------------------------
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Residues in contact with ALA 176 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    172B  PHE*     2.7    23.2    +      -       +      +
    173B  LEU*     4.3     2.9    -      -       -      +
    175B  GLU*     1.3    72.5    -      -       -      +
    177B  TRP*     1.3    57.2    +      -       -      +
    180B  GLY*     3.0    26.0    +      -       -      -
    260B  ALA*     3.7    15.4    +      -       +      +
    263B  LEU*     3.9    27.8    -      -       +      +
    264B  GLY*     3.5    11.8    -      -       -      +
    267B  LEU*     5.6     4.5    -      -       +      +
----------------------------------------------------------
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Residues in contact with TRP 177 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    173B  LEU*     3.1    25.8    +      -       +      +
    174B  ASN      4.1     2.2    -      -       -      +
    176B  ALA*     1.3    77.3    -      -       -      +
    178B  LEU*     1.3    67.5    +      -       +      +
    180B  GLY*     4.1     1.6    -      -       -      -
    181B  MET*     2.9    52.3    +      -       +      +
    267B  LEU*     5.8    10.3    -      -       +      -
     45D  TYR*     3.4    38.6    -      +       -      -
     49D  VAL*     4.0    13.1    -      -       +      +
    129D  THR*     3.8    20.1    -      -       +      +
    133D  LEU*     4.1    19.1    -      -       +      -
----------------------------------------------------------
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Residues in contact with LEU 178 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    174B  ASN*     3.2    32.0    +      -       -      +
    175B  GLU*     4.3     4.5    -      -       -      +
    176B  ALA      3.2     0.4    -      -       -      -
    177B  TRP*     1.3    80.3    -      -       +      +
    179B  THR*     1.3    61.0    +      -       -      +
    180B  GLY      3.1     1.6    -      -       -      -
    181B  MET*     2.9    24.2    +      -       -      +
    182B  LEU*     2.9    27.5    +      -       -      +
    213B  ILE*     3.5    31.9    -      -       +      +
    217B  LEU*     3.2    61.2    -      -       +      +
    221B  THR*     5.3     1.6    -      -       -      +
    223B  TYR*     5.2     7.2    -      -       +      -
    225B  ILE*     4.4     7.2    -      -       +      -
----------------------------------------------------------
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Residues in contact with THR 179 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     94B  ASN*     5.2     2.2    -      -       -      +
     96B  ALA*     4.6     2.5    -      -       +      -
     97B  VAL*     6.3     0.2    -      -       +      -
    175B  GLU*     3.0    22.4    +      -       -      -
    176B  ALA      4.4     1.6    -      -       -      -
    178B  LEU*     1.3    77.1    -      -       -      +
    180B  GLY*     1.3    56.2    +      -       -      +
    182B  LEU*     3.5     9.2    +      -       +      +
    183B  GLN*     3.1    25.8    +      -       -      +
    225B  ILE*     3.4    39.5    +      -       +      +
    261B  PRO*     3.2    37.7    -      -       +      +
    264B  GLY*     4.0     0.7    -      -       -      -
    265B  ALA*     3.7    13.6    -      -       +      +
----------------------------------------------------------
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Residues in contact with GLY 180 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    176B  ALA      3.0    16.1    +      -       -      -
    177B  TRP      4.4     1.1    -      -       -      -
    179B  THR*     1.3    75.9    -      -       -      +
    181B  MET*     1.3    61.5    +      -       -      +
    183B  GLN*     4.5     0.2    -      -       -      -
    184B  LEU*     3.3    15.2    +      -       -      +
    264B  GLY      3.0    22.1    +      -       -      -
    267B  LEU*     5.6     2.5    -      -       -      -
    268B  GLY*     3.3    25.7    -      -       -      -
    271B  ILE*     4.4     5.5    -      -       -      +
----------------------------------------------------------
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Residues in contact with MET 181 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    177B  TRP*     2.9    54.2    +      -       +      +
    178B  LEU*     2.9    20.7    +      -       -      +
    180B  GLY*     1.3    74.0    -      -       -      +
    182B  LEU*     1.3    65.3    +      -       -      +
    184B  LEU*     3.4     9.1    +      -       -      +
    185B  CYS*     3.3    22.2    +      -       -      +
    209B  LEU*     4.4     3.3    -      -       -      +
    213B  ILE*     4.7     8.7    -      -       +      -
    271B  ILE*     6.0     0.2    -      -       -      -
     45D  TYR*     5.6     0.7    -      -       +      -
     46D  VAL*     4.8    12.3    -      -       +      -
     49D  VAL*     3.5    33.7    -      -       +      -
     50D  PHE*     3.6    27.4    -      -       +      -
----------------------------------------------------------
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Residues in contact with LEU 182 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     94B  ASN*     4.4     2.0    -      -       -      +
     97B  VAL*     4.2    24.7    -      -       +      -
    178B  LEU      2.9    11.6    +      -       -      +
    179B  THR*     3.6    10.1    -      -       +      +
    180B  GLY      3.4     0.2    -      -       -      -
    181B  MET*     1.3    75.4    -      -       -      +
    183B  GLN*     1.3    63.6    +      -       -      +
    185B  CYS*     3.3     1.7    +      -       -      -
    186B  LEU*     2.8    40.1    +      -       +      +
    206B  ILE*     5.7     5.4    -      -       +      -
    209B  LEU*     3.8    18.8    -      -       +      +
    210B  VAL*     4.1    26.2    -      -       +      -
    213B  ILE*     4.2     8.4    -      -       +      +
    225B  ILE*     3.5    38.6    -      -       +      -
    265B  ALA*     6.5     0.4    -      -       +      -
    403B  GOL      5.7     2.0    -      -       -      -
----------------------------------------------------------
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Residues in contact with GLN 183 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     97B  VAL*     3.6    21.3    -      -       -      +
    100B  ALA*     3.5    10.1    -      -       -      +
    179B  THR      3.1    17.2    +      -       -      +
    180B  GLY      4.0     5.4    -      -       -      +
    181B  MET      3.4     0.2    -      -       -      -
    182B  LEU*     1.3    79.5    -      -       +      +
    184B  LEU*     1.3    58.0    +      -       -      +
    186B  LEU*     3.9    16.0    -      -       -      +
    187B  PHE*     2.8    78.8    +      -       +      -
    265B  ALA*     3.2    42.0    -      -       +      +
    268B  GLY      4.2     2.2    -      -       -      -
    269B  GLY      3.8     3.8    -      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 184 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    180B  GLY      3.3    14.3    +      -       -      +
    181B  MET*     3.9     8.3    -      -       -      +
    182B  LEU      3.1     0.8    -      -       -      -
    183B  GLN*     1.3    78.1    -      -       -      +
    185B  CYS*     1.3    64.3    +      -       -      +
    187B  PHE*     4.8     2.9    -      -       -      -
    188B  ALA*     3.1    23.9    +      -       -      +
    268B  GLY      4.0     7.0    -      -       -      +
    271B  ILE*     3.5    36.1    -      -       +      +
    272B  TYR*     3.9    26.7    -      -       +      +
    275B  PHE*     6.2     0.2    -      -       +      -
    276B  ILE*     5.7     0.7    -      -       +      -
     42D  MET*     5.3    11.2    -      -       +      -
     46D  VAL*     5.4     9.6    -      -       +      -
     84D  VAL*     3.4    33.0    -      -       +      -
----------------------------------------------------------
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Residues in contact with CYS 185 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    181B  MET      3.3     7.4    +      -       -      +
    182B  LEU      3.3     1.4    +      -       -      -
    184B  LEU*     1.3    76.9    -      -       -      +
    186B  LEU*     1.3    58.1    +      -       -      +
    187B  PHE      3.0     2.2    -      -       -      -
    188B  ALA*     2.8     6.1    +      -       -      -
    189B  ILE*     2.6    48.7    +      -       +      +
    209B  LEU*     3.4    39.3    -      -       +      -
     46D  VAL*     6.2     0.7    -      -       -      -
     50D  PHE*     5.9     0.4    -      -       -      -
     80D  MET*     4.2    34.8    -      -       -      -
     83D  HIS*     5.7     2.5    -      -       -      -
     84D  VAL*     5.2     7.9    -      -       -      -
----------------------------------------------------------
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Residues in contact with LEU 186 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     97B  VAL*     3.8    29.8    -      -       +      -
    182B  LEU*     2.8    25.1    +      -       +      +
    183B  GLN*     3.7    14.4    -      -       -      +
    185B  CYS*     1.3    76.5    -      -       -      +
    187B  PHE*     1.3    56.1    +      -       +      +
    189B  ILE*     4.2     4.3    -      -       -      -
    190B  THR*     2.5    39.3    +      -       +      +
    206B  ILE*     3.3    29.8    -      -       +      -
    209B  LEU*     4.6     1.7    -      -       +      +
    403B  GOL      3.2    47.8    -      -       -      +
----------------------------------------------------------
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Residues in contact with PHE 187 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     97B  VAL*     5.8     1.6    -      -       +      -
    100B  ALA*     4.6    13.9    -      -       +      -
    101B  ASN*     5.0    15.0    -      -       +      -
    104B  LEU*     3.3    28.0    -      -       +      -
    183B  GLN*     2.8    52.9    +      -       +      +
    184B  LEU      4.2     0.4    -      -       -      +
    185B  CYS      3.0     0.4    -      -       -      -
    186B  LEU*     1.3    85.6    -      -       +      +
    188B  ALA*     1.3    58.9    +      -       -      +
    189B  ILE      3.3     0.4    -      -       -      -
    190B  THR*     3.5     6.0    +      -       -      -
    191B  ASP*     2.9    32.4    +      -       -      +
    269B  GLY*     3.7    12.3    -      -       -      -
    272B  TYR*     3.7    29.0    -      +       +      -
    401B  GOL      3.8    23.1    -      -       -      +
----------------------------------------------------------
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Residues in contact with ALA 188 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    184B  LEU      3.1    19.4    +      -       -      +
    185B  CYS*     2.8     8.4    +      -       -      +
    187B  PHE*     1.3    77.9    -      -       -      +
    189B  ILE*     1.3    59.7    +      -       -      +
    191B  ASP*     3.8    13.1    +      -       -      +
    194B  ASN*     4.2    10.1    +      -       -      +
    272B  TYR*     3.5    22.8    -      -       +      +
     83D  HIS*     2.9    25.6    +      -       +      -
     84D  VAL*     4.1    18.6    -      -       +      -
----------------------------------------------------------
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Residues in contact with ILE 189 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    185B  CYS*     2.6    40.9    +      -       +      +
    186B  LEU      4.8     1.6    -      -       -      +
    188B  ALA*     1.3    72.1    -      -       -      +
    190B  THR*     1.3    64.1    +      -       +      +
    191B  ASP      3.2     3.9    +      -       -      +
    197B  ALA*     5.8     2.8    -      -       -      +
    198B  LEU*     4.1     6.9    +      -       +      +
    202B  GLU*     3.1    46.9    -      -       +      +
    205B  VAL*     3.5    34.3    -      -       +      +
    206B  ILE*     3.9    23.3    -      -       +      +
    209B  LEU*     5.2     0.4    -      -       +      -
     80D  MET*     5.1     0.2    -      -       -      -
     83D  HIS*     2.9    33.2    +      -       +      +
----------------------------------------------------------
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Residues in contact with THR 190 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    186B  LEU*     2.5    37.0    +      -       +      +
    187B  PHE*     3.5    11.1    +      -       -      -
    189B  ILE*     1.3    76.1    -      -       -      +
    191B  ASP*     1.3    59.1    +      -       -      +
    192B  GLN*     3.1    17.4    +      -       -      +
    202B  GLU*     3.4    25.9    -      -       +      +
    206B  ILE*     5.0     5.4    -      -       +      -
    403B  GOL      6.3     0.7    -      -       -      -
----------------------------------------------------------
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Residues in contact with ASP 191 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    187B  PHE      2.9    19.8    +      -       -      +
    188B  ALA      3.9     8.7    -      -       -      +
    189B  ILE      3.2     3.9    -      -       -      +
    190B  THR*     1.3    73.6    -      -       -      +
    192B  GLN*     1.3    61.1    +      -       -      +
    193B  GLU*     2.5    42.7    +      -       -      +
    194B  ASN*     3.6    22.1    +      -       +      +
    195B  ASN      4.8     1.9    -      -       -      +
    197B  ALA*     5.1     3.2    -      -       -      +
    272B  TYR*     2.7    31.8    +      -       +      +
    280B  ILE*     3.7    18.5    -      -       -      +
----------------------------------------------------------
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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