Contacts of the helix formed by residues 78 - 107 (chain F) in PDB entry 4O46


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 LYS 78 (chain F).
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
      9E  GLN*     5.3    13.2    -      -       +      +
     70F  THR*     5.3     6.3    -      -       -      -
     77F  LYS*     1.4    80.0    -      -       +      +
     79F  ILE*     1.4    60.2    +      -       -      +
     81F  MET*     3.2     8.8    +      -       -      +
     82F  VAL*     3.0    35.8    +      -       +      +
----------------------------------------------------------
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Residues in contact with ILE 79 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     67F  GLU*     4.2    14.5    -      -       +      +
     70F  THR*     4.0    17.6    -      -       -      +
     71F  SER*     3.9    33.2    -      -       -      +
     77F  LYS      3.5     3.9    -      -       -      +
     78F  LYS*     1.4    77.0    -      -       -      +
     80F  GLU*     1.4    55.4    +      -       -      +
     82F  VAL*     3.5     4.9    +      -       -      +
     83F  ARG*     3.0    32.3    +      -       +      +
----------------------------------------------------------
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Residues in contact with GLU 80 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     77F  LYS*     3.0    31.3    -      -       -      +
     78F  LYS      3.2     0.2    -      -       -      -
     79F  ILE*     1.4    76.9    -      -       -      +
     81F  MET*     1.3    66.7    +      -       -      +
     83F  ARG*     3.7     6.8    -      -       -      +
     84F  ALA*     3.2    25.8    +      -       -      +
----------------------------------------------------------
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Residues in contact with MET 81 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
      6E  GLN*     3.9    30.3    -      -       +      +
      9E  GLN*     5.1     9.2    -      -       +      -
     10E  LYS*     3.8    30.5    -      -       +      +
     13E  LEU*     4.4    13.3    -      -       +      +
     77F  LYS      3.4     9.3    +      -       -      +
     78F  LYS*     3.2    12.3    +      -       -      +
     80F  GLU*     1.3    84.6    +      -       -      +
     82F  VAL*     1.4    62.4    +      -       -      +
     83F  ARG      3.3     0.4    -      -       -      -
     84F  ALA*     3.5    10.8    +      -       +      +
     85F  TYR*     3.2    22.7    +      -       -      +
----------------------------------------------------------
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Residues in contact with VAL 82 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
      9E  GLN*     5.9     2.9    -      -       +      +
     13E  LEU*     3.7    30.5    -      -       +      -
     63F  ILE*     3.6    21.1    -      -       +      +
     66F  ILE*     4.2    12.6    -      -       +      -
     67F  GLU*     3.8    33.0    -      -       +      +
     70F  THR*     4.9     5.8    -      -       -      -
     78F  LYS*     3.0    21.0    +      -       +      +
     79F  ILE*     3.8     7.6    -      -       -      +
     81F  MET*     1.4    74.2    -      -       +      +
     83F  ARG*     1.4    53.2    +      -       -      +
     85F  TYR*     3.3     3.5    +      -       -      +
     86F  ARG*     2.9    32.8    +      -       -      +
----------------------------------------------------------
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Residues in contact with ARG 83 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     67F  GLU*     3.4    23.5    +      -       -      +
     79F  ILE*     3.0    19.1    +      -       +      +
     80F  GLU*     3.7     8.7    -      -       -      +
     82F  VAL*     1.4    73.7    -      -       -      +
     84F  ALA*     1.4    57.4    +      -       -      +
     86F  ARG*     3.4     3.0    +      -       -      +
     87F  GLU*     3.1    30.7    +      -       -      +
----------------------------------------------------------
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Residues in contact with ALA 84 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     80F  GLU      3.2    15.2    +      -       -      +
     81F  MET*     3.6    13.5    -      -       +      +
     82F  VAL      3.4     0.2    -      -       -      -
     83F  ARG*     1.4    76.9    -      -       -      +
     85F  TYR*     1.3    57.9    +      -       -      +
     87F  GLU*     3.9     5.2    +      -       -      +
     88F  LYS*     3.2    24.4    +      -       -      +
----------------------------------------------------------
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Residues in contact with TYR 85 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     10E  LYS*     5.2     6.1    -      -       +      -
     13E  LEU*     4.3    13.0    -      -       +      -
     14E  ALA*     3.6    21.7    -      -       +      +
     17E  ALA*     3.9     7.9    -      -       +      -
     19E  ARG*     3.1    27.4    +      -       -      +
     22E  ASP*     3.0    29.5    +      -       +      -
     63F  ILE*     3.7    29.6    -      -       +      -
     81F  MET      3.2    13.7    +      -       -      +
     82F  VAL*     3.5    10.5    -      -       -      +
     83F  ARG      3.2     0.4    -      -       -      -
     84F  ALA*     1.3    75.2    -      -       -      +
     86F  ARG*     1.4    62.5    +      -       -      +
     87F  GLU      3.3     0.4    -      -       -      -
     88F  LYS*     3.2    23.0    +      -       +      +
     89F  ILE*     3.1    44.4    +      -       +      +
----------------------------------------------------------
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Residues in contact with ARG 86 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     60F  TRP*     3.9    16.7    -      -       +      +
     63F  ILE*     3.7    22.4    -      -       +      +
     64F  SER*     5.3     2.7    -      -       -      +
     67F  GLU*     4.4    18.6    -      -       -      +
     82F  VAL      2.9    17.7    +      -       -      +
     83F  ARG      3.4     6.0    +      -       -      +
     85F  TYR*     1.4    74.1    -      -       -      +
     87F  GLU*     1.4    55.9    +      -       -      +
     89F  ILE*     3.7     3.6    +      -       -      +
     90F  GLU*     3.0    30.5    +      -       -      +
----------------------------------------------------------
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Residues in contact with GLU 87 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     83F  ARG      3.1    15.8    +      -       -      +
     84F  ALA*     4.1     6.5    -      -       -      +
     86F  ARG*     1.4    75.0    -      -       -      +
     88F  LYS*     1.4    57.6    +      -       -      +
     90F  GLU*     3.6     9.6    -      -       -      +
     91F  LYS*     3.1    36.1    +      -       +      +
----------------------------------------------------------
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Residues in contact with LYS 88 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     19E  ARG*     4.3    14.8    -      -       -      +
     22E  ASP*     4.6     3.8    -      -       -      +
     84F  ALA      3.2    16.0    +      -       -      +
     85F  TYR*     3.2    35.3    +      -       +      +
     87F  GLU*     1.4    76.5    -      -       -      +
     89F  ILE*     1.4    61.3    +      -       -      +
     91F  LYS*     3.5     6.3    +      -       -      +
     92F  GLU*     3.2    30.8    +      -       +      +
----------------------------------------------------------
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Residues in contact with ILE 89 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     17E  ALA*     4.8     0.2    -      -       +      -
     19E  ARG*     4.0    29.6    -      -       -      +
     56F  ARG*     3.4    34.7    -      -       +      +
     59F  SER*     4.1     8.5    -      -       -      -
     60F  TRP*     3.8    16.8    -      -       +      +
     63F  ILE*     3.8    30.1    -      -       +      -
     85F  TYR*     3.1    36.4    +      -       +      +
     86F  ARG*     4.0     4.3    -      -       -      +
     88F  LYS*     1.4    72.3    -      -       +      +
     90F  GLU*     1.4    59.2    +      -       -      +
     92F  GLU*     3.1    10.6    +      -       -      +
     93F  LEU*     2.9    28.4    +      -       +      +
----------------------------------------------------------
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Residues in contact with GLU 90 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     60F  TRP*     2.8    31.6    +      -       +      +
     86F  ARG*     3.0    21.0    +      -       -      +
     87F  GLU*     3.6    10.7    -      -       -      +
     89F  ILE*     1.4    75.2    -      -       -      +
     91F  LYS*     1.4    56.4    +      -       +      +
     93F  LEU*     3.2     8.0    +      -       -      +
     94F  GLU*     2.9    48.4    +      -       -      +
    137F  VAL*     3.0    40.6    -      -       +      +
----------------------------------------------------------
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Residues in contact with LYS 91 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     87F  GLU*     3.1    23.0    +      -       +      +
     88F  LYS*     3.7     6.5    -      -       -      +
     90F  GLU*     1.4    74.6    -      -       +      +
     92F  GLU*     1.4    57.9    +      -       +      +
     94F  GLU*     3.5    14.7    +      -       -      +
     95F  ALA*     3.1    29.3    +      -       -      +
----------------------------------------------------------
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Residues in contact with GLU 92 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     19E  ARG*     3.0    43.8    +      -       -      -
     56F  ARG*     3.2    29.6    +      -       +      +
     88F  LYS*     3.2    23.8    +      -       +      +
     89F  ILE*     3.1    11.5    +      -       -      +
     91F  LYS*     1.4    75.7    -      -       +      +
     93F  LEU*     1.4    61.8    +      -       -      +
     95F  ALA*     3.3     8.3    +      -       -      +
     96F  VAL*     3.1    28.9    +      -       +      +
----------------------------------------------------------
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Residues in contact with LEU 93 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     53F  VAL*     4.0    11.9    -      -       +      -
     56F  ARG*     3.8    16.3    -      -       +      +
     57F  ARG*     3.7    40.4    -      -       +      +
     60F  TRP*     4.6    14.1    -      -       +      -
     89F  ILE      2.9    11.9    +      -       -      +
     90F  GLU*     3.3    10.8    -      -       -      +
     92F  GLU*     1.4    73.8    -      -       -      +
     94F  GLU*     1.3    60.5    +      -       +      +
     96F  VAL*     3.1     8.4    +      -       -      +
     97F  CYS*     3.0    45.9    +      -       -      -
    133F  TYR*     3.8    25.6    -      -       +      +
    134F  LEU*     4.8     3.1    -      -       -      +
    137F  VAL*     5.0    11.4    -      -       +      -
----------------------------------------------------------
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Residues in contact with GLU 94 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     90F  GLU*     2.9    41.0    +      -       +      +
     91F  LYS*     3.8    15.1    -      -       -      +
     93F  LEU*     1.3    77.5    -      -       +      +
     95F  ALA*     1.4    57.3    +      -       -      +
     97F  CYS*     3.5     2.3    +      -       -      +
     98F  GLN*     3.0    29.7    +      -       -      +
    134F  LEU*     3.8    31.1    -      -       +      +
    137F  VAL*     5.0     7.8    -      -       +      +
----------------------------------------------------------
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Residues in contact with ALA 95 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     91F  LYS      3.1    14.8    +      -       -      +
     92F  GLU*     3.5    11.9    -      -       -      +
     93F  LEU      3.3     0.4    -      -       -      -
     94F  GLU*     1.4    71.6    -      -       -      +
     96F  VAL*     1.4    64.9    +      -       +      +
     98F  GLN*     3.4     8.2    -      -       -      +
     99F  ASP*     3.2    30.5    +      -       -      +
----------------------------------------------------------
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Residues in contact with VAL 96 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     49F  TYR*     3.9    19.9    -      -       +      +
     52F  VAL*     3.8    31.2    -      -       +      -
     53F  VAL*     3.8    26.5    -      -       +      +
     56F  ARG*     4.7    11.9    -      -       -      +
     92F  GLU      3.1    17.1    +      -       -      +
     93F  LEU      3.1     7.2    +      -       -      +
     95F  ALA*     1.4    73.1    -      -       +      +
     97F  CYS*     1.4    64.9    +      -       -      +
     99F  ASP*     3.3    15.2    +      -       -      +
    100F  VAL*     3.2    21.9    +      -       +      +
----------------------------------------------------------
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Residues in contact with CYS 97 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     53F  VAL*     3.6    23.1    -      -       -      -
     93F  LEU*     3.0    32.9    +      -       -      +
     94F  GLU      3.8     0.2    -      -       -      +
     96F  VAL*     1.4    75.0    -      -       -      +
     98F  GLN*     1.4    59.7    +      -       -      +
    100F  VAL*     3.6     1.4    +      -       -      +
    101F  LEU*     3.2    32.3    +      -       -      +
    130F  TYR*     3.8    32.8    -      -       +      +
    133F  TYR*     3.9     8.1    -      -       -      -
    134F  LEU*     3.7    26.9    -      -       +      -
----------------------------------------------------------
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Residues in contact with GLN 98 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     94F  GLU      3.0    18.0    +      -       -      +
     95F  ALA*     3.4    11.0    -      -       -      +
     96F  VAL      3.2     0.2    -      -       -      -
     97F  CYS*     1.4    75.3    -      -       -      +
     99F  ASP*     1.4    60.8    +      -       -      +
    101F  LEU*     3.6     5.2    +      -       -      +
    102F  SER*     2.9    31.4    +      -       -      -
    134F  LEU*     5.5     1.5    -      -       -      +
----------------------------------------------------------
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Residues in contact with ASP 99 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     28F  LYS*     3.5    31.9    +      -       -      +
     49F  TYR*     4.3    19.5    +      -       +      +
     95F  ALA*     3.2    13.7    +      -       -      +
     96F  VAL*     3.3     9.6    +      -       -      +
     98F  GLN*     1.4    73.9    -      -       -      +
    100F  VAL*     1.4    59.8    +      -       -      +
    102F  SER*     3.5     6.8    +      -       -      -
    103F  LEU*     3.0    30.0    +      -       -      +
----------------------------------------------------------
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Residues in contact with VAL 100 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     45F  LEU*     6.1     1.6    -      -       +      -
     49F  TYR*     3.4    35.9    -      -       +      -
     96F  VAL*     3.2    17.2    +      -       +      +
     97F  CYS      3.9     4.9    -      -       -      +
     98F  GLN      3.4     0.2    -      -       -      -
     99F  ASP*     1.4    73.4    -      -       -      +
    101F  LEU*     1.4    53.7    +      -       +      +
    103F  LEU*     3.2     7.4    +      -       -      +
    104F  LEU*     2.8    44.3    +      -       +      +
    126F  MET*     3.7    30.7    -      -       +      -
    130F  TYR*     3.7    37.0    -      -       +      -
----------------------------------------------------------
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Residues in contact with LEU 101 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     97F  CYS      3.2    18.2    +      -       -      +
     98F  GLN*     4.2     4.5    -      -       -      +
    100F  VAL*     1.4    72.0    -      -       -      +
    102F  SER*     1.4    54.4    +      -       -      +
    104F  LEU*     3.7     7.0    -      -       +      +
    105F  ASP*     2.9    36.6    +      -       -      +
    127F  LYS*     3.6    42.2    -      -       +      +
    130F  TYR*     4.0    15.5    -      -       +      -
    131F  TYR*     3.7    46.4    -      -       +      +
    134F  LEU*     3.8    18.2    -      -       +      -
----------------------------------------------------------
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Residues in contact with SER 102 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     98F  GLN      2.9    20.6    +      -       -      -
     99F  ASP*     3.6     9.0    -      -       -      -
    101F  LEU*     1.4    75.3    -      -       -      +
    103F  LEU*     1.4    55.9    +      -       -      +
    105F  ASP*     5.0     0.2    -      -       -      -
    106F  ASN*     2.9    53.7    +      -       -      +
    107F  TYR*     5.2     1.4    -      -       -      -
----------------------------------------------------------
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Residues in contact with LEU 103 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     28F  LYS*     5.6    10.5    -      -       +      -
     31F  THR*     4.1    19.5    -      -       +      -
     32F  GLU*     6.4     1.3    -      -       +      -
     45F  LEU*     5.8     5.6    -      -       +      -
     49F  TYR*     6.2     2.7    -      -       +      -
     99F  ASP      3.0    19.0    +      -       -      +
    100F  VAL*     3.2     5.6    +      -       -      +
    102F  SER*     1.4    75.9    +      -       -      +
    104F  LEU*     1.4    58.3    +      -       -      +
    107F  TYR*     3.2    23.0    +      -       +      +
    108F  LEU*     3.0    31.1    +      -       +      +
----------------------------------------------------------
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Residues in contact with LEU 104 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    100F  VAL*     2.8    34.8    +      -       +      +
    101F  LEU*     3.7    12.3    -      -       +      +
    102F  SER      3.3     0.2    -      -       -      -
    103F  LEU*     1.4    74.3    -      -       -      +
    105F  ASP*     1.3    58.9    +      -       -      +
    108F  LEU*     3.6    22.1    +      -       +      -
    109F  ILE*     2.7    36.3    +      -       +      +
    123F  TYR*     4.4    22.0    -      -       +      +
    126F  MET*     4.6    13.5    -      -       +      -
    127F  LYS*     4.9    12.1    -      -       +      +
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Residues in contact with ASP 105 (chain F). Click here for Legend to table.
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                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
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    101F  LEU      2.9    20.0    +      -       -      +
    102F  SER*     5.0     0.4    -      -       -      -
    104F  LEU*     1.3    74.3    -      -       -      +
    106F  ASN*     1.4    66.6    +      -       -      +
    107F  TYR      3.5     0.4    +      -       -      -
    109F  ILE*     4.9     4.2    -      -       -      +
    110F  LYS*     3.8    17.7    +      -       -      +
    127F  LYS*     5.0    17.0    -      -       -      +
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Residues in contact with ASN 106 (chain F). Click here for Legend to table.
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                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    102F  SER*     2.9    32.6    +      -       -      +
    105F  ASP*     1.4    83.4    -      -       -      +
    107F  TYR*     1.4    81.7    +      -       +      +
    110F  LYS*     3.4    21.2    -      -       -      +
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Residues in contact with TYR 107 (chain F). Click here for Legend to table.
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                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
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     31F  THR*     3.4    31.9    -      -       +      +
     32F  GLU*     3.6    44.9    +      -       +      +
     34F  ASN*     3.5    31.4    +      -       -      -
    102F  SER*     5.7     0.7    -      -       -      -
    103F  LEU*     3.2    23.2    +      -       +      +
    105F  ASP      3.5     0.8    -      -       -      -
    106F  ASN*     1.4    97.4    -      -       +      +
    108F  LEU*     1.3    62.8    +      -       +      +
    109F  ILE      3.8     1.1    -      -       -      -
    110F  LYS*     3.8     3.7    -      -       -      +
    111F  ASN*     2.9    43.2    +      -       -      +
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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) +   -    +    +   +   +    +    -
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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