Contacts of the helix formed by residues 42 - 69 (chain E) in PDB entry 1W88


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 SER 42 (chain E).
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     40E  GLU      4.3     0.4    +      -       -      -
     41E  LEU*     1.3    74.2    -      -       -      +
     43E  ASP*     1.3    57.4    +      -       -      +
     44E  GLU*     3.8     8.5    +      -       -      +
     45E  GLN*     2.8    49.1    +      -       -      +
     46E  LEU*     3.0    10.6    +      -       -      +
----------------------------------------------------------
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Residues in contact with ASP 43 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     41E  LEU      3.7     1.1    +      -       -      +
     42E  SER*     1.3    71.8    -      -       -      +
     44E  GLU*     1.3    61.4    +      -       -      +
     46E  LEU*     3.4    17.7    +      -       -      +
     47E  LYS*     3.2    22.2    +      -       -      +
    306E  LYS*     3.9    13.2    +      -       -      -
    308E  LEU*     3.2    46.4    -      -       +      +
----------------------------------------------------------
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Residues in contact with GLU 44 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     42E  SER*     3.1     8.2    -      -       -      +
     43E  ASP*     1.3    79.0    -      -       -      +
     45E  GLN*     1.3    69.9    +      -       -      +
     47E  LYS*     3.4     4.5    +      -       -      +
     48E  GLU*     3.0    22.3    +      -       -      +
     51E  ARG*     3.0    35.2    +      -       -      -
----------------------------------------------------------
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Residues in contact with GLN 45 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     41E  LEU*     4.0    23.5    -      -       +      +
     42E  SER*     2.8    27.3    +      -       -      +
     44E  GLU*     1.3    90.5    -      -       -      +
     46E  LEU*     1.3    63.8    +      -       -      +
     47E  LYS      3.2     1.8    -      -       -      -
     48E  GLU*     4.2    10.6    -      -       -      +
     49E  LEU*     3.1    17.3    +      -       -      +
     90E  PHE*     3.2    36.6    -      -       +      -
----------------------------------------------------------
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Residues in contact with LEU 46 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     38E  MET*     5.0     4.7    -      -       +      -
     41E  LEU*     3.4    38.4    -      -       +      +
     42E  SER      3.0    11.2    +      -       -      +
     43E  ASP*     3.4    27.8    +      -       -      +
     45E  GLN*     1.3    76.9    -      -       -      +
     47E  LYS*     1.3    60.4    +      -       -      +
     49E  LEU*     3.7     4.2    -      -       -      +
     50E  MET*     3.3    15.6    +      -       -      +
    239E  LEU*     4.2    19.5    -      -       +      -
    299E  PHE*     3.5    23.7    -      -       +      -
    302E  PHE*     4.0    25.4    -      -       +      -
    303E  LEU*     4.3     8.5    -      -       +      +
    306E  LYS*     4.8    11.7    -      -       -      +
    308E  LEU*     4.4    10.3    -      -       +      -
----------------------------------------------------------
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Residues in contact with LYS 47 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     43E  ASP      3.2    12.1    +      -       -      +
     44E  GLU*     3.6    10.3    -      -       -      +
     45E  GLN      3.2     0.2    -      -       -      -
     46E  LEU*     1.3    76.0    -      -       -      +
     48E  GLU*     1.3    54.5    +      -       -      +
     49E  LEU      3.1     1.1    -      -       -      -
     50E  MET*     2.9     8.6    +      -       -      +
     51E  ARG*     2.8    57.2    +      -       -      +
    303E  LEU*     5.8     2.5    -      -       -      -
    308E  LEU*     4.6    17.0    -      -       +      +
    309E  TRP*     4.0     7.1    -      -       +      -
    313E  GLU*     5.1     2.2    -      -       -      +
----------------------------------------------------------
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Residues in contact with GLU 48 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     44E  GLU*     3.0    17.9    +      -       -      +
     45E  GLN*     4.0    15.0    -      -       -      +
     47E  LYS*     1.3    75.8    -      -       -      +
     49E  LEU*     1.3    56.9    +      -       -      +
     51E  ARG*     3.1    36.0    +      -       -      +
     52E  ARG*     3.0    72.3    +      -       -      +
     90E  PHE*     4.1    12.3    -      -       +      -
    110E  TRP*     5.1     3.1    -      -       -      -
----------------------------------------------------------
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Residues in contact with LEU 49 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     41E  LEU*     4.9    12.1    -      -       +      -
     45E  GLN      3.1    17.8    +      -       -      +
     46E  LEU*     3.7     7.9    -      -       -      +
     47E  LYS      3.1     0.4    -      -       -      -
     48E  GLU*     1.3    77.4    -      -       -      +
     50E  MET*     1.3    56.3    +      -       -      +
     52E  ARG*     3.5     2.0    +      -       -      +
     53E  MET*     3.0    42.6    +      -       +      +
     86E  ILE*     3.9    27.4    -      -       +      +
     87E  ALA*     4.1     9.0    -      -       +      +
     90E  PHE*     3.8    34.2    -      -       +      -
    238E  PRO*     4.2    23.8    -      -       +      +
    239E  LEU*     5.3     0.7    -      -       +      -
    242E  TYR*     5.4     2.0    -      -       +      -
    299E  PHE*     4.0    21.8    -      -       +      -
----------------------------------------------------------
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Residues in contact with MET 50 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     46E  LEU      3.3    11.4    +      -       -      +
     47E  LYS*     2.9     9.0    +      -       -      +
     49E  LEU*     1.3    76.2    -      -       -      +
     51E  ARG*     1.3    66.3    +      -       -      +
     53E  MET*     3.1     3.8    +      -       -      +
     54E  VAL*     2.8    32.7    +      -       +      +
    296E  LEU*     3.5    33.7    -      -       +      +
    299E  PHE*     3.6    29.4    -      -       +      +
    300E  ARG*     3.4    38.1    -      -       +      +
    303E  LEU*     4.6     3.6    -      -       +      -
    309E  TRP*     3.4    47.1    -      -       +      +
----------------------------------------------------------
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Residues in contact with ARG 51 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     44E  GLU*     3.0    33.6    +      -       -      -
     47E  LYS*     2.8    36.1    +      -       -      +
     48E  GLU*     3.1    32.5    +      -       -      +
     50E  MET*     1.3    72.4    -      -       -      +
     52E  ARG*     1.3    57.1    +      -       -      +
     54E  VAL      3.2     0.2    +      -       -      -
     55E  TYR*     2.8    28.7    +      -       -      +
    110E  TRP*     5.4     0.4    -      -       -      -
    309E  TRP*     3.9    14.3    -      -       +      -
    313E  GLU*     4.5    13.9    +      -       +      +
    317E  VAL*     3.4    38.6    -      -       +      +
----------------------------------------------------------
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Residues in contact with ARG 52 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     48E  GLU*     3.0    47.5    +      -       -      +
     49E  LEU      3.7     2.5    -      -       -      +
     51E  ARG*     1.3    75.4    -      -       -      +
     53E  MET*     1.3    57.6    +      -       -      +
     55E  TYR      3.3     1.0    +      -       -      -
     56E  THR*     2.9    35.0    +      -       -      -
     86E  ILE*     3.5    20.4    -      -       +      -
     89E  HIS*     4.0    23.2    +      -       -      -
     90E  PHE*     3.3    38.6    -      -       -      +
    110E  TRP*     3.6    48.9    +      -       +      +
----------------------------------------------------------
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Residues in contact with MET 53 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     49E  LEU*     3.0    29.5    +      -       +      +
     50E  MET*     3.1    10.5    +      -       -      +
     52E  ARG*     1.3    74.8    -      -       -      +
     54E  VAL*     1.3    61.7    +      -       -      +
     56E  THR      3.9     0.2    -      -       -      -
     57E  ARG*     3.2    19.2    +      -       -      +
     82E  GLU*     3.6    49.1    -      -       +      +
     83E  ALA*     4.2     2.0    -      -       -      -
     86E  ILE*     4.1    11.0    -      -       +      -
     87E  ALA      5.3     0.7    -      -       -      -
    238E  PRO*     3.6    30.3    -      -       +      -
    295E  PRO*     4.6     5.6    -      -       -      +
    296E  LEU*     4.2    16.1    -      -       +      +
    299E  PHE*     3.2    42.8    -      -       +      -
----------------------------------------------------------
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Residues in contact with VAL 54 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     50E  MET*     2.8    20.2    +      -       +      +
     51E  ARG*     3.5     3.8    -      -       -      +
     53E  MET*     1.3    74.3    -      -       -      +
     55E  TYR*     1.3    65.5    +      -       -      +
     57E  ARG*     3.1    17.0    +      -       -      +
     58E  ILE*     3.1    14.1    +      -       +      +
    296E  LEU*     3.7    24.2    -      -       +      -
    309E  TRP*     4.0    17.0    -      -       +      -
    314E  GLU*     4.0    18.8    -      -       +      +
    317E  VAL*     3.7    24.5    -      -       +      -
    318E  ILE*     3.8    25.8    -      -       +      +
----------------------------------------------------------
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Residues in contact with TYR 55 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     51E  ARG      2.8    16.0    +      -       -      +
     52E  ARG      3.6     4.3    -      -       -      +
     54E  VAL*     1.3    79.8    -      -       -      +
     56E  THR*     1.3    60.1    +      -       -      +
     58E  ILE*     3.5     3.6    +      -       -      +
     59E  LEU*     2.9    35.6    +      -       +      +
    109E  ILE*     6.0     5.4    -      -       +      -
    110E  TRP*     3.8    28.3    -      +       +      -
    115E  LEU*     3.9    21.0    -      -       +      +
    317E  VAL*     4.1     7.6    -      -       +      -
    320E  GLN*     4.0    17.3    -      -       -      -
    321E  ALA*     3.6    36.0    -      -       +      +
    324E  GLU*     2.6    44.5    +      -       -      +
    325E  ILE*     5.1     2.2    -      -       +      -
----------------------------------------------------------
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Residues in contact with THR 56 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     52E  ARG      2.9    11.5    +      -       -      -
     53E  MET      3.9     4.9    -      -       -      -
     55E  TYR*     1.3    75.0    -      -       -      +
     57E  ARG*     1.3    64.4    +      -       -      +
     59E  LEU*     3.3    14.0    +      -       +      +
     60E  ASP*     3.1    22.6    +      -       +      +
     78E  THR*     5.8     2.9    -      -       -      +
     82E  GLU*     3.9    17.9    -      -       +      +
     85E  GLN*     4.8     2.9    -      -       -      +
     86E  ILE*     3.5    10.6    -      -       +      +
    106E  PRO*     3.9    30.3    -      -       +      -
    110E  TRP*     2.7    31.0    +      -       -      -
----------------------------------------------------------
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Residues in contact with ARG 57 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     53E  MET      3.2    13.8    +      -       -      +
     54E  VAL      3.1    10.8    +      -       -      +
     56E  THR*     1.3    75.5    -      -       -      +
     58E  ILE*     1.3    65.3    +      -       +      +
     60E  ASP*     3.2     4.3    +      -       -      +
     61E  GLN*     3.1    47.5    +      -       -      +
     79E  ALA*     4.5    12.9    -      -       -      +
     80E  GLY*     3.9    14.0    -      -       -      +
     82E  GLU*     3.0    41.7    +      -       -      +
    294E  ASP*     3.0    42.0    +      -       -      -
    296E  LEU*     3.7    25.6    -      -       +      +
----------------------------------------------------------
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Residues in contact with ILE 58 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     54E  VAL*     3.1    15.7    +      -       +      +
     55E  TYR      3.8     6.3    -      -       -      +
     57E  ARG*     1.3    81.3    -      -       +      +
     59E  LEU*     1.3    62.6    +      -       -      +
     61E  GLN*     3.8    22.6    -      -       +      +
     62E  ARG*     3.0    38.9    +      -       +      +
    318E  ILE*     3.8    42.0    -      -       +      +
    321E  ALA*     3.9    16.2    -      -       +      -
    322E  LYS*     3.8    34.3    -      -       +      -
    325E  ILE*     4.3     1.6    -      -       +      -
----------------------------------------------------------
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Residues in contact with LEU 59 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     55E  TYR*     2.9    23.9    +      -       +      +
     56E  THR*     3.3    21.5    +      -       +      +
     58E  ILE*     1.3    78.0    -      -       -      +
     60E  ASP*     1.3    52.0    +      -       -      +
     62E  ARG*     3.9     1.4    -      -       -      +
     63E  SER*     2.6    43.0    +      -       -      +
     75E  TYR*     5.8     1.1    -      -       +      +
    106E  PRO*     5.2    10.1    -      -       +      -
    109E  ILE*     3.9    26.9    -      -       +      -
    110E  TRP*     6.3     0.7    -      -       -      +
    115E  LEU*     3.7    24.5    -      -       +      -
    119E  PHE*     3.9    20.2    -      -       +      -
    325E  ILE*     3.7    19.2    -      -       +      +
----------------------------------------------------------
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Residues in contact with ASP 60 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     56E  THR*     3.1    13.4    +      -       +      +
     57E  ARG*     3.2    10.4    +      -       -      +
     59E  LEU*     1.3    74.3    -      -       -      +
     61E  GLN*     1.3    63.1    +      -       -      +
     63E  SER*     3.1     2.4    +      -       -      -
     64E  ILE*     2.8    46.4    +      -       -      +
     75E  TYR*     2.3    37.9    +      -       -      +
     77E  PRO*     3.5     2.8    -      -       -      +
     78E  THR*     3.0    19.3    +      -       -      +
     79E  ALA*     3.1    38.1    -      -       -      +
     82E  GLU*     5.1     1.1    -      -       -      +
----------------------------------------------------------
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Residues in contact with GLN 61 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     57E  ARG*     3.1    45.2    +      -       -      +
     58E  ILE*     3.5    22.3    +      -       +      +
     60E  ASP*     1.3    80.8    -      -       -      +
     62E  ARG*     1.3    63.1    +      -       +      +
     64E  ILE*     3.5    10.0    +      -       +      +
     65E  SER*     3.2    26.8    +      -       -      -
    322E  LYS*     6.1     0.5    -      -       -      -
----------------------------------------------------------
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Residues in contact with ARG 62 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     58E  ILE*     3.0    33.5    +      -       +      +
     59E  LEU      4.1     2.7    -      -       -      +
     61E  GLN*     1.3    80.0    -      -       +      +
     63E  SER*     1.3    57.0    +      -       -      +
     65E  SER*     3.6    24.0    +      -       -      -
     66E  LEU*     2.9    60.6    +      -       -      +
     69E  GLN*     5.0     5.7    +      -       -      +
    119E  PHE*     6.3     0.2    -      -       +      -
    322E  LYS*     4.5    23.7    -      -       +      +
    325E  ILE*     4.1    29.6    -      -       +      +
----------------------------------------------------------
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Residues in contact with SER 63 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     59E  LEU*     2.6    38.4    +      -       -      +
     60E  ASP      3.1     5.1    +      -       -      -
     62E  ARG*     1.3    74.7    -      -       -      +
     64E  ILE*     1.3    64.1    +      -       -      +
     66E  LEU*     4.3     0.9    -      -       -      -
     67E  ASN*     2.9    26.2    +      -       -      +
     72E  LEU*     3.5    16.8    -      -       -      +
     75E  TYR*     3.5    31.8    -      -       -      -
    119E  PHE*     4.0    12.6    -      -       -      -
----------------------------------------------------------
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Residues in contact with ILE 64 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     60E  ASP*     2.8    38.4    +      -       -      +
     61E  GLN*     3.7    10.5    -      -       +      +
     63E  SER*     1.3    72.5    -      -       -      +
     65E  SER*     1.3    59.5    +      -       -      +
     67E  ASN*     3.0    17.0    +      -       -      +
     68E  ARG*     2.8    43.6    +      -       +      +
     75E  TYR*     4.0    16.8    -      -       +      -
     77E  PRO*     5.0    11.9    -      -       +      -
     79E  ALA*     5.7     2.2    -      -       +      -
----------------------------------------------------------
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Residues in contact with SER 65 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     61E  GLN      3.2    12.5    +      -       -      -
     62E  ARG*     3.6    24.9    +      -       -      -
     64E  ILE*     1.3    77.5    -      -       -      +
     66E  LEU*     1.3    58.6    +      -       -      +
     68E  ARG*     3.1    26.2    +      -       -      +
     69E  GLN*     2.9    47.2    +      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 66 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     62E  ARG*     2.9    54.9    +      -       -      +
     63E  SER*     4.3     1.1    -      -       -      -
     65E  SER*     1.3    76.2    -      -       -      +
     67E  ASN*     1.3    55.2    +      -       -      +
     69E  GLN*     3.4     9.0    +      -       -      +
     70E  GLY      3.4     3.1    +      -       -      -
     71E  ARG*     2.7    59.7    +      -       +      +
     72E  LEU*     3.2    24.6    +      -       +      -
    119E  PHE*     4.6     4.0    -      -       +      -
    325E  ILE*     4.4    16.6    -      -       +      -
    329E  ILE*     3.7    35.0    -      -       +      -
----------------------------------------------------------
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Residues in contact with ASN 67 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     63E  SER      2.9    19.4    +      -       -      +
     64E  ILE*     3.4    12.5    -      -       -      +
     66E  LEU*     1.3    73.6    -      -       -      +
     68E  ARG*     1.3    70.0    +      -       -      +
     70E  GLY*     3.1    14.2    +      -       -      -
     72E  LEU*     3.7    23.4    +      -       +      +
     73E  GLY      3.9    12.2    +      -       -      +
     75E  TYR*     4.2    19.6    -      -       +      +
----------------------------------------------------------
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Residues in contact with ARG 68 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     64E  ILE*     2.8    30.1    +      -       +      +
     65E  SER*     3.5    34.5    +      -       -      +
     67E  ASN*     1.3    78.2    -      -       -      +
     69E  GLN*     1.3    66.1    +      -       -      +
     70E  GLY      3.1     3.9    +      -       -      -
----------------------------------------------------------
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Residues in contact with GLN 69 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     62E  ARG*     5.0     6.2    +      -       -      +
     65E  SER*     2.9    40.8    +      -       -      +
     66E  LEU*     3.6    13.7    -      -       -      +
     67E  ASN      3.2     0.4    -      -       -      -
     68E  ARG*     1.3    83.0    -      -       +      +
     70E  GLY*     1.3    61.9    +      -       -      +
     71E  ARG*     3.1    28.9    +      -       -      +
----------------------------------------------------------
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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