Contacts of the helix formed by residues 150 - 176 (chain K) in PDB entry 2FJC


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 ASP 150 (chain K).
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     32K  ILE*     5.9     2.7    -      -       +      +
     35K  ILE*     3.8    13.8    -      -       +      +
     89K  ARG*     2.9    27.5    +      -       -      -
     93K  LEU*     4.1    12.6    -      -       -      +
    145K  ALA*     2.8    18.3    +      -       -      +
    148K  SER*     3.3    12.5    +      -       -      +
    149K  GLY*     1.3    73.3    -      -       -      +
    151K  ALA*     1.3    60.8    +      -       -      +
    152K  VAL      3.6     0.9    +      -       -      -
    153K  THR*     2.6    30.6    +      -       -      -
    154K  ASP*     3.0    19.7    +      -       -      +
----------------------------------------------------------
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Residues in contact with ALA 151 (chain K). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    142A  GLN*     3.5    42.6    -      -       +      +
    158A  THR*     3.5    22.3    -      -       +      +
    161A  LEU*     4.9     5.4    -      -       +      -
    149K  GLY      2.7    10.2    +      -       -      +
    150K  ASP*     1.3    72.0    -      -       -      +
    152K  VAL*     1.3    56.3    +      -       +      +
    154K  ASP*     3.1     9.1    -      -       -      +
    155K  GLY      2.9    25.8    +      -       -      -
----------------------------------------------------------
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Residues in contact with VAL 152 (chain K). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    158A  THR*     4.2     6.7    -      -       -      +
    161A  LEU*     3.7    44.2    -      -       +      +
    162A  ARG*     3.8    21.3    +      -       +      +
    165A  GLY*     6.0     0.7    -      -       -      -
     89K  ARG*     3.4    37.2    -      -       -      +
     92K  GLN*     4.7     3.1    -      -       -      +
    150K  ASP*     3.3     1.0    +      -       -      -
    151K  ALA*     1.3    76.5    -      -       +      +
    153K  THR*     1.3    63.2    +      -       -      +
    155K  GLY*     3.2     2.3    +      -       -      -
    156K  ILE*     2.9    35.5    +      -       +      +
----------------------------------------------------------
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Residues in contact with THR 153 (chain K). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     35K  ILE*     4.0    21.1    -      -       +      -
     39K  LEU*     4.4     7.2    -      -       +      -
     89K  ARG*     2.9    27.3    +      -       +      +
     93K  LEU*     4.1     3.1    -      -       -      +
    141K  THR*     4.4     4.7    -      -       +      -
    145K  ALA*     4.0    10.1    -      -       +      -
    150K  ASP*     2.6    34.4    +      -       -      -
    152K  VAL*     1.3    75.8    -      -       -      +
    154K  ASP*     1.3    64.4    +      -       -      +
    156K  ILE*     4.3     4.7    -      -       -      -
    157K  ILE*     2.9    49.7    +      -       +      +
----------------------------------------------------------
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Residues in contact with ASP 154 (chain K). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    151H  ALA*     5.1     0.3    -      -       -      +
    142K  GLN*     2.9    25.4    -      -       -      +
    145K  ALA*     3.7    10.9    -      -       +      +
    146K  ALA*     3.4    26.9    -      -       -      +
    150K  ASP      3.0    14.2    +      -       -      +
    151K  ALA*     3.1    15.0    -      -       -      +
    153K  THR*     1.3    78.1    -      -       -      +
    155K  GLY*     1.3    58.3    +      -       -      +
    157K  ILE*     3.4     3.8    +      -       -      +
    158K  THR*     2.8    40.2    +      -       -      -
----------------------------------------------------------
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Residues in contact with GLY 155 (chain K). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    158A  THR*     5.0     5.4    -      -       -      -
    162A  ARG*     3.2    16.8    -      -       -      -
    151K  ALA      2.9    14.8    +      -       -      -
    152K  VAL      3.7     1.6    -      -       -      -
    154K  ASP*     1.3    78.1    -      -       -      +
    156K  ILE*     1.3    61.3    +      -       -      +
    158K  THR*     3.9     5.9    -      -       -      -
    159K  ASP*     3.0    30.8    +      -       -      +
----------------------------------------------------------
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Residues in contact with ILE 156 (chain K). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    162A  ARG*     3.9    32.8    -      -       +      +
     85K  THR*     4.0    30.1    -      -       -      +
     86K  ILE*     4.4     7.0    -      -       +      -
     89K  ARG*     3.9    36.8    -      -       +      -
     92K  GLN*     5.5     2.2    -      -       -      +
    152K  VAL*     2.9    24.8    +      -       +      +
    153K  THR      3.2     7.2    +      -       -      +
    155K  GLY*     1.3    77.9    -      -       -      +
    157K  ILE*     1.3    74.5    +      -       +      +
    159K  ASP*     3.3     3.5    +      -       -      +
    160K  ILE*     3.3    27.5    +      -       +      +
----------------------------------------------------------
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Residues in contact with ILE 157 (chain K). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     39K  LEU*     4.3     9.2    -      -       +      -
     42K  HIS*     4.9     0.4    -      -       +      -
     86K  ILE*     4.9     7.2    -      -       +      -
     89K  ARG*     6.1     0.7    -      -       +      -
    138K  PHE*     3.3    45.8    -      -       +      +
    141K  THR*     4.0    18.4    -      -       +      -
    142K  GLN*     3.6    11.7    -      -       +      -
    153K  THR*     2.9    40.9    +      -       +      +
    154K  ASP      4.0     2.0    -      -       -      +
    156K  ILE*     1.3    87.7    -      -       +      +
    158K  THR*     1.3    53.9    +      -       -      +
    160K  ILE*     3.1     8.7    +      -       -      +
    161K  LEU*     2.7    46.9    +      -       +      +
----------------------------------------------------------
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Residues in contact with THR 158 (chain K). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    151H  ALA*     3.5    44.0    -      -       +      +
    152H  VAL*     4.1     5.6    -      -       +      +
    155H  GLY*     5.1     8.5    -      -       -      -
    142K  GLN*     3.8     2.9    +      -       -      +
    154K  ASP*     2.8    38.7    +      -       -      -
    155K  GLY*     3.9     6.3    -      -       -      -
    157K  ILE*     1.3    77.5    -      -       -      +
    159K  ASP*     1.3    60.0    +      -       -      +
    161K  LEU*     3.1     9.6    +      -       -      +
    162K  ARG*     2.8    32.1    +      -       +      +
----------------------------------------------------------
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Residues in contact with ASP 159 (chain K). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    162A  ARG*     3.0    32.2    +      -       -      +
    155K  GLY*     3.0    18.1    +      -       -      +
    156K  ILE*     3.6     5.8    -      -       -      +
    157K  ILE      3.2     0.2    -      -       -      -
    158K  THR*     1.3    77.9    -      -       -      +
    160K  ILE*     1.3    63.5    +      -       +      +
    162K  ARG*     3.3    29.9    +      -       -      +
    163K  THR*     3.3    19.9    +      -       -      +
----------------------------------------------------------
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Residues in contact with ILE 160 (chain K). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     46K  LEU*     6.2     0.2    -      -       +      -
     82K  ALA*     3.7    28.9    -      -       +      -
     85K  THR*     4.3     2.9    -      -       -      +
     86K  ILE*     3.6    35.7    -      -       +      -
    138K  PHE*     3.8    31.0    -      -       +      -
    156K  ILE*     3.5    21.3    -      -       +      +
    157K  ILE*     3.1    10.4    +      -       -      +
    159K  ASP*     1.3    74.9    -      -       +      +
    161K  LEU*     1.3    62.7    +      -       -      +
    163K  THR*     3.0    12.5    +      -       -      +
    164K  LEU*     2.9    33.6    +      -       +      +
----------------------------------------------------------
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Residues in contact with LEU 161 (chain K). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    151H  ALA*     4.8     6.3    -      -       +      -
    152H  VAL*     3.7    19.6    -      -       +      +
    135K  SER*     3.6    30.5    +      -       -      +
    138K  PHE*     3.3    29.2    -      -       +      -
    139K  SER*     4.0    21.3    -      -       -      +
    142K  GLN*     4.2    12.6    -      -       +      -
    157K  ILE*     2.7    33.6    +      -       +      +
    158K  THR*     3.1    13.7    +      -       -      +
    160K  ILE*     1.3    73.8    -      -       -      +
    162K  ARG*     1.3    56.8    +      -       -      +
    164K  LEU*     3.3     4.8    +      -       +      +
    165K  GLY*     2.9    26.9    +      -       -      -
----------------------------------------------------------
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Residues in contact with ARG 162 (chain K). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     92H  GLN*     5.0     3.0    +      -       -      +
    152H  VAL*     3.7    25.6    +      -       +      +
    155H  GLY*     3.3    25.9    -      -       -      -
    156H  ILE*     3.9    29.0    -      -       +      +
    159H  ASP*     3.1    30.1    +      -       -      +
    158K  THR*     2.8    17.7    +      -       -      +
    159K  ASP*     3.4    25.8    +      -       -      +
    160K  ILE      3.2     0.4    -      -       -      -
    161K  LEU*     1.3    77.0    -      -       -      +
    163K  THR*     1.3    66.6    +      -       +      +
    165K  GLY*     3.3     2.1    +      -       -      -
    166K  LYS*     3.2    21.6    +      -       +      +
----------------------------------------------------------
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Residues in contact with THR 163 (chain K). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     78K  SER*     4.4    15.1    +      -       -      +
    159K  ASP      3.5    13.9    -      -       -      +
    160K  ILE*     3.0    19.4    +      -       -      +
    162K  ARG*     1.3    79.3    -      -       +      +
    164K  LEU*     1.3    62.5    +      -       -      +
    166K  LYS*     3.4     7.9    +      -       -      +
    167K  ALA*     3.1    23.4    +      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 164 (chain K). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    131K  PHE*     3.8    45.8    -      -       +      +
    134K  LEU*     4.0     7.4    -      -       +      -
    135K  SER*     3.8    24.0    -      -       -      +
    138K  PHE*     3.5    37.5    -      -       +      -
    160K  ILE*     2.9    23.0    +      -       +      +
    161K  LEU*     3.6     8.1    -      -       +      +
    162K  ARG      3.2     0.2    -      -       -      -
    163K  THR*     1.3    78.6    +      -       -      +
    165K  GLY*     1.3    58.4    +      -       -      +
    167K  ALA*     3.1     4.1    +      -       +      +
    168K  ILE*     2.8    42.6    +      -       +      +
----------------------------------------------------------
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Residues in contact with GLY 165 (chain K). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     89H  ARG*     5.1     4.0    -      -       -      -
     92H  GLN*     3.9    19.4    -      -       -      +
    152H  VAL*     6.0     0.7    -      -       -      -
    135K  SER*     5.6     2.4    +      -       -      -
    161K  LEU      2.9    16.8    +      -       -      -
    162K  ARG      3.8     1.8    -      -       -      -
    163K  THR      3.3     0.2    -      -       -      -
    164K  LEU*     1.3    77.5    -      -       -      +
    166K  LYS*     1.3    60.9    +      -       -      +
    168K  ILE*     3.8     8.3    -      -       -      +
    169K  TRP*     3.0    24.6    +      -       -      +
----------------------------------------------------------
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Residues in contact with LYS 166 (chain K). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     69E  HIS*     5.0     3.6    +      -       -      -
     88H  GLU*     3.1    29.5    +      -       -      +
     92H  GLN*     3.6    18.0    +      -       -      +
    162K  ARG*     3.2    13.6    +      -       +      +
    163K  THR*     3.7    10.3    -      -       -      +
    165K  GLY*     1.3    76.3    -      -       -      +
    167K  ALA*     1.3    57.4    +      -       -      +
    169K  TRP*     3.4    12.3    +      -       +      +
    170K  MET*     3.0    57.9    +      -       +      +
----------------------------------------------------------
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Residues in contact with ALA 167 (chain K). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     75K  TYR*     4.0    19.5    -      -       +      -
    131K  PHE*     3.8    26.9    -      -       +      -
    163K  THR      3.1    17.9    +      -       -      +
    164K  LEU*     3.7     4.5    -      -       +      +
    166K  LYS*     1.3    74.7    -      -       -      +
    168K  ILE*     1.3    60.7    +      -       -      +
    170K  MET*     3.2     8.8    +      -       -      +
    171K  LEU*     2.8    36.3    +      -       -      +
----------------------------------------------------------
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Residues in contact with ILE 168 (chain K). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    128K  LYS*     3.8    10.0    -      -       +      +
    131K  PHE*     3.6    44.4    -      -       +      +
    132K  GLU*     3.7    33.7    -      -       +      +
    135K  SER*     4.0    14.8    -      -       -      +
    164K  LEU*     2.8    27.8    +      -       +      +
    165K  GLY*     3.8     7.2    -      -       -      +
    167K  ALA*     1.3    71.7    -      -       -      +
    169K  TRP*     1.3    59.4    +      -       -      +
    171K  LEU*     3.4     7.8    +      -       -      +
    172K  GLY*     2.9    26.0    +      -       -      -
----------------------------------------------------------
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Residues in contact with TRP 169 (chain K). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     58E  TRP      3.9     9.4    +      -       -      -
     65E  PHE*     3.8    18.4    -      +       -      -
     69E  HIS*     3.6    27.6    -      +       -      -
     88H  GLU*     4.0    14.8    -      -       +      -
     91H  LEU*     3.4    53.4    -      -       +      +
     92H  GLN*     3.6    27.8    -      -       +      -
    165K  GLY      3.0    18.1    +      -       -      +
    166K  LYS*     3.6    24.7    -      -       +      +
    168K  ILE*     1.3    79.7    -      -       -      +
    170K  MET*     1.3    83.0    +      -       +      +
    172K  GLY*     3.2     2.7    +      -       -      -
    173K  ALA*     2.9    30.2    +      -       +      +
----------------------------------------------------------
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Residues in contact with MET 170 (chain K). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     65E  PHE*     3.8    24.0    -      -       +      -
     66E  LYS*     5.1    20.2    -      -       +      -
     69E  HIS*     4.7    11.0    -      -       -      +
     70E  GLU*     6.1     0.4    -      -       -      +
     75K  TYR*     5.2     4.5    -      -       -      +
    166K  LYS*     3.0    61.0    +      -       +      +
    167K  ALA*     3.2     7.8    +      -       -      +
    169K  TRP*     1.3    96.2    -      -       +      +
    171K  LEU*     1.3    56.9    +      -       -      +
    173K  ALA*     3.1     2.8    +      -       -      +
    174K  THR*     2.7    37.2    +      -       +      +
----------------------------------------------------------
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Residues in contact with LEU 171 (chain K). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     71K  LEU*     4.6     4.9    -      -       +      -
     75K  TYR*     3.5    18.8    -      -       +      +
    124K  LEU*     3.8    41.5    -      -       +      -
    127K  VAL*     3.3    27.6    -      -       +      -
    128K  LYS*     3.7    28.9    -      -       +      -
    131K  PHE*     3.8    14.6    -      -       +      -
    167K  ALA      2.8    21.2    +      -       -      +
    168K  ILE*     3.8     3.8    -      -       -      +
    170K  MET*     1.3    75.6    -      -       -      +
    172K  GLY*     1.3    64.8    +      -       -      +
    174K  THR*     3.2     6.8    +      -       +      +
    175K  LEU*     2.9    29.8    +      -       +      +
----------------------------------------------------------
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Residues in contact with GLY 172 (chain K). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    128K  LYS*     3.4    23.1    -      -       -      +
    168K  ILE      2.9    12.6    +      -       -      -
    169K  TRP*     3.6     4.0    -      -       -      -
    170K  MET      3.2     0.2    -      -       -      -
    171K  LEU*     1.3    78.0    -      -       -      +
    173K  ALA*     1.3    55.9    +      -       -      +
    175K  LEU*     3.8     2.7    -      -       -      +
    176K  LYS*     2.9    31.2    +      -       -      +
----------------------------------------------------------
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Residues in contact with ALA 173 (chain K). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     60E  ILE      4.4     5.2    -      -       -      +
     61E  TYR*     3.3     9.7    -      -       +      +
     62E  GLY      2.9    23.0    +      -       -      -
     65E  PHE*     3.6    35.4    -      -       +      -
    169K  TRP*     2.9    22.1    +      -       +      +
    170K  MET      3.1     8.0    +      -       -      +
    172K  GLY*     1.3    77.4    -      -       -      +
    174K  THR*     1.3    59.1    +      -       -      +
    175K  LEU      3.5     0.2    +      -       -      -
    176K  LYS*     3.6     8.0    +      -       -      -
----------------------------------------------------------
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Residues in contact with THR 174 (chain K). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     62E  GLY*     2.9    32.4    -      -       -      -
     63E  ILE*     3.1    22.6    +      -       -      +
     65E  PHE*     3.5    19.7    -      -       +      -
     66E  LYS*     4.5     7.4    -      -       +      +
     71K  LEU*     6.2     3.6    -      -       +      -
    124K  LEU*     3.8    24.2    -      -       +      +
    170K  MET*     2.7    31.2    +      -       +      +
    171K  LEU*     3.5     9.1    +      -       +      +
    173K  ALA*     1.3    76.2    -      -       -      +
    175K  LEU*     1.3    63.0    +      -       -      +
    176K  LYS      3.4     0.6    -      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 175 (chain K). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     63E  ILE*     6.0     0.7    -      -       +      -
    121K  VAL*     3.7    41.1    -      -       +      +
    124K  LEU*     3.8    17.5    -      -       +      +
    125K  ALA*     3.4    35.2    -      -       +      +
    128K  LYS*     4.2    14.8    -      -       +      -
    171K  LEU      2.9    20.3    +      -       -      +
    172K  GLY*     4.1     3.6    -      -       -      +
    174K  THR*     1.3    81.9    -      -       -      +
    176K  LYS*     1.3    67.1    +      -       -      +
    177K  ALA*     3.4     5.7    +      -       -      +
----------------------------------------------------------
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Residues in contact with LYS 176 (chain K). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     59E  HIS      5.5     0.4    +      -       -      -
     61E  TYR*     3.5    42.3    -      -       +      +
     62E  GLY*     4.1    10.7    -      -       -      -
     63E  ILE      5.3     0.2    +      -       -      -
    117E  GLU*     2.5    51.8    +      -       -      +
    172K  GLY      2.9    18.7    +      -       -      +
    173K  ALA*     3.7    10.8    -      -       -      +
    174K  THR      3.4     1.7    -      -       -      +
    175K  LEU*     1.3    78.7    -      -       -      +
    177K  ALA*     1.3    68.1    +      -       -      +
----------------------------------------------------------
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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