Contacts of the helix formed by residues 50 - 78 (chain N) in PDB entry 1JY3


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 50 (chain N).
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     49N  PRO*     1.3    75.3    -      -       -      +
     51N  GLY*     1.3    64.7    +      -       -      +
     52N  CYS*     3.2    13.0    +      -       -      +
     53N  ARG*     3.1    19.4    +      -       -      +
     54N  MET*     3.0    21.8    +      -       -      +
     68O  ASP*     5.3     0.8    +      -       -      -
     83O  CYS*     3.6    13.5    -      -       -      +
     22P  THR*     4.5     0.2    -      -       -      -
     79R  LEU      4.7     1.2    +      -       -      -
     81R  VAL      4.1     8.9    +      -       -      -
----------------------------------------------------------
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Residues in contact with GLY 51 (chain N). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     49N  PRO      3.6     2.8    +      -       -      -
     50N  SER*     1.3    73.9    +      -       -      +
     52N  CYS*     1.3    57.5    +      -       -      +
     54N  MET      3.4     0.6    +      -       -      -
     55N  LYS*     3.0    28.6    +      -       -      +
     83O  CYS*     3.9    10.1    -      -       -      +
     84O  PRO*     3.6    24.9    -      -       -      +
     89O  LEU*     3.8    18.1    -      -       -      +
     22P  THR*     4.0     6.7    -      -       -      +
----------------------------------------------------------
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Residues in contact with CYS 52 (chain N). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     50N  SER*     3.1     5.8    +      -       -      +
     51N  GLY*     1.3    72.8    -      -       -      +
     53N  ARG*     1.3    65.5    +      -       -      +
     55N  LYS      3.5     0.3    +      -       -      -
     56N  GLY      3.1    10.2    +      -       -      -
     68O  ASP*     3.5    10.7    -      -       +      +
     69O  ALA      3.0    39.3    +      -       -      +
     71O  GLY*     3.4    31.2    -      -       -      -
     81O  VAL*     4.4     4.7    -      -       -      -
     83O  CYS*     2.1    48.9    -      -       -      +
     84O  PRO*     4.1     0.7    -      -       -      -
     36Q  TRP*     4.5     6.1    -      -       +      -
----------------------------------------------------------
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Residues in contact with ARG 53 (chain N). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     50N  SER*     3.1    22.5    +      -       -      +
     52N  CYS*     1.3    78.0    -      -       -      +
     54N  MET*     1.3    67.7    +      -       -      +
     56N  GLY      3.1     2.3    +      -       -      -
     57N  LEU*     2.9    34.7    +      -       +      +
     66O  PRO*     3.4    29.2    +      -       -      +
     67O  PRO      3.2    15.8    +      -       -      +
     68O  ASP*     2.9    41.3    +      -       -      +
     77R  PRO      3.6     7.5    +      -       -      -
     78R  ASP      2.8    43.3    +      -       -      +
     79R  LEU*     4.3     9.2    -      -       -      +
     80R  GLY*     3.6    14.3    -      -       -      +
----------------------------------------------------------
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Residues in contact with MET 54 (chain N). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     49N  PRO*     3.7    25.8    -      -       +      -
     50N  SER      3.0    19.1    +      -       -      +
     51N  GLY      3.9     3.8    -      -       -      +
     52N  CYS      3.4     0.2    -      -       -      -
     53N  ARG*     1.3    76.7    -      -       -      +
     55N  LYS*     1.3    58.0    +      -       -      +
     57N  LEU*     3.7    12.1    -      -       +      +
     58N  ILE*     2.8    36.8    +      -       -      +
     89O  LEU*     4.1    14.1    -      -       +      -
     22P  THR*     4.0    23.8    -      -       +      +
     25P  ILE*     4.2    11.4    -      -       +      -
     26P  ALA*     3.6    32.5    -      -       +      +
     29P  LEU*     4.0    23.8    -      -       +      -
     79R  LEU*     4.0    11.4    -      -       +      -
----------------------------------------------------------
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Residues in contact with LYS 55 (chain N). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     51N  GLY      3.0    17.6    +      -       -      +
     52N  CYS      3.8     4.3    -      -       -      +
     53N  ARG      3.2     0.2    -      -       -      -
     54N  MET*     1.3    76.9    -      -       -      +
     56N  GLY*     1.3    64.1    +      -       -      +
     58N  ILE*     4.4     3.1    -      -       +      -
     59N  ASP*     2.7    56.2    +      -       -      +
     69O  ALA*     3.9    11.7    -      -       +      +
     70O  ASP*     3.0    41.5    +      -       +      +
     84O  PRO*     4.4     6.7    -      -       +      -
     89O  LEU*     3.7    20.1    -      -       +      +
     92O  THR*     3.9    26.7    -      -       +      +
----------------------------------------------------------
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Residues in contact with GLY 56 (chain N). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     52N  CYS      3.1    11.4    +      -       -      -
     53N  ARG      3.1     0.2    +      -       -      -
     55N  LYS*     1.3    79.2    -      -       -      +
     57N  LEU*     1.3    55.7    +      -       -      +
     59N  ASP*     3.4     4.2    +      -       -      +
     60N  GLU*     3.0    28.8    +      -       -      +
     67O  PRO*     3.5    35.7    -      -       -      +
     69O  ALA*     4.1    12.3    -      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 57 (chain N). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     53N  ARG*     2.9    27.4    +      -       +      +
     54N  MET*     3.8    21.8    -      -       +      +
     56N  GLY*     1.3    73.4    -      -       -      +
     58N  ILE*     1.3    66.2    +      -       -      +
     60N  GLU*     3.3     9.0    +      -       -      +
     61N  VAL*     3.0    28.5    +      -       +      +
     64O  ARG*     3.9    24.9    -      -       -      +
     67O  PRO*     3.8    12.1    -      -       +      +
     29P  LEU*     4.1    15.3    -      -       +      -
     78R  ASP*     3.8    33.7    -      -       +      +
     79R  LEU*     4.2    11.7    -      -       +      -
----------------------------------------------------------
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Residues in contact with ILE 58 (chain N). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     54N  MET*     2.8    22.1    +      -       -      +
     55N  LYS*     3.7     4.5    -      -       +      +
     57N  LEU*     1.3    74.8    -      -       -      +
     59N  ASP*     1.3    65.2    +      -       -      +
     61N  VAL*     3.3     4.5    +      -       -      +
     62N  ASP*     3.0    21.3    +      -       -      +
     89O  LEU*     3.9    24.5    -      -       +      +
     92O  THR*     3.7    19.3    -      -       +      -
     93O  LEU*     3.7    34.3    -      -       +      -
     96O  GLN*     3.2    24.7    -      -       -      +
     25P  ILE*     3.8    17.9    -      -       +      -
     29P  LEU*     4.0    22.0    -      -       +      -
----------------------------------------------------------
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Residues in contact with ASP 59 (chain N). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     55N  LYS*     2.7    53.4    +      -       -      +
     56N  GLY*     3.8     5.2    -      -       -      +
     58N  ILE*     1.3    79.1    -      -       -      +
     60N  GLU*     1.3    58.2    +      -       -      +
     62N  ASP*     3.3     5.7    +      -       -      +
     63N  GLN*     3.0    31.2    +      -       -      +
     69O  ALA*     4.8     5.8    -      -       +      +
     92O  THR*     4.4     1.0    -      -       -      +
     96O  GLN*     3.7    17.0    +      -       -      -
----------------------------------------------------------
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Residues in contact with GLU 60 (chain N). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     56N  GLY      3.0    17.0    +      -       -      +
     57N  LEU*     3.6    14.5    -      -       -      +
     58N  ILE      3.3     0.2    -      -       -      -
     59N  ASP*     1.3    74.5    -      -       -      +
     61N  VAL*     1.3    68.1    +      -       +      +
     63N  GLN*     3.3     6.8    +      -       -      +
     64N  ASP*     3.0    24.8    +      -       +      +
     64O  ARG*     2.7    50.8    +      -       -      +
     67O  PRO*     4.0     9.3    -      -       +      +
----------------------------------------------------------
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Residues in contact with VAL 61 (chain N). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     57N  LEU*     3.0    17.8    +      -       +      +
     58N  ILE      3.3     7.8    +      -       -      +
     60N  GLU*     1.3    81.7    -      -       +      +
     62N  ASP*     1.3    62.0    +      -       -      +
     64N  ASP*     3.3     5.9    +      -       -      +
     65N  PHE*     3.0    53.3    +      -       +      -
     29P  LEU*     4.2    18.4    -      -       +      -
     32P  TYR*     4.3    14.4    -      -       +      -
     33P  GLN*     3.7    26.0    -      -       +      -
----------------------------------------------------------
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Residues in contact with ASP 62 (chain N). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     58N  ILE      3.0     9.5    +      -       -      +
     59N  ASP*     3.3     7.6    +      -       -      +
     61N  VAL*     1.3    79.1    -      -       -      +
     63N  GLN*     1.3    62.0    +      -       -      +
     65N  PHE*     4.0     3.5    -      -       -      +
     66N  THR*     2.8    43.0    +      -       -      -
     96O  GLN*     3.5    49.8    +      -       -      +
    100O  ILE*     3.8    19.2    -      -       -      +
     32P  TYR*     4.8     2.8    +      -       -      -
----------------------------------------------------------
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Residues in contact with GLN 63 (chain N). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     59N  ASP      3.0    17.8    +      -       -      +
     60N  GLU*     3.7     6.7    -      -       -      +
     62N  ASP*     1.3    78.0    +      -       -      +
     64N  ASP*     1.3    66.2    +      -       -      +
     66N  THR*     3.8     9.0    +      -       -      +
     67N  SER*     3.0    27.6    +      -       -      -
----------------------------------------------------------
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Residues in contact with ASP 64 (chain N). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     60N  GLU*     3.0    19.4    +      -       +      +
     61N  VAL*     3.3     6.9    +      -       -      +
     63N  GLN*     1.3    78.3    -      -       -      +
     65N  PHE*     1.3    66.5    +      -       -      +
     67N  SER*     3.3     5.7    +      -       -      -
     68N  ARG*     3.0    64.9    +      -       -      +
     33P  GLN*     5.0     2.6    -      -       -      +
----------------------------------------------------------
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Residues in contact with PHE 65 (chain N). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     61N  VAL*     3.0    37.8    +      -       +      +
     62N  ASP*     4.0     1.8    -      -       -      +
     64N  ASP*     1.3    83.6    -      -       -      +
     66N  THR*     1.3    60.3    +      -       -      +
     68N  ARG*     3.8    18.1    -      -       -      +
     69N  ILE*     2.9    38.7    +      -       +      +
    100O  ILE*     3.8    17.7    -      -       +      -
     32P  TYR*     4.3    17.3    -      +       -      -
     33P  GLN*     3.4    46.0    -      -       +      -
     36P  VAL*     3.5    33.7    -      -       +      -
     37P  ASP      4.1     3.6    -      -       -      -
     40P  LEU*     3.5    18.2    -      -       +      -
----------------------------------------------------------
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Residues in contact with THR 66 (chain N). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     62N  ASP*     2.8    37.6    +      -       -      -
     63N  GLN*     3.8    11.2    -      -       -      +
     65N  PHE*     1.3    75.9    -      -       -      +
     67N  SER*     1.3    58.3    +      -       -      +
     69N  ILE*     3.4     8.2    +      -       -      +
     70N  ASN*     3.0    46.9    +      -       -      +
    100O  ILE*     4.4     5.6    -      -       -      +
----------------------------------------------------------
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Residues in contact with SER 67 (chain N). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     63N  GLN*     3.0    20.2    +      -       -      -
     64N  ASP*     3.6     6.5    -      -       -      -
     65N  PHE      3.3     0.2    -      -       -      -
     66N  THR*     1.3    77.4    -      -       -      +
     68N  ARG*     1.3    62.2    +      -       -      +
     70N  ASN*     3.3     8.7    +      -       -      +
     71N  LYS*     3.0    24.1    +      -       -      +
----------------------------------------------------------
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Residues in contact with ARG 68 (chain N). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     64N  ASP*     3.0    49.7    +      -       -      +
     65N  PHE*     3.8    16.5    -      -       -      +
     67N  SER*     1.3    75.7    -      -       -      +
     69N  ILE*     1.3    65.7    +      -       -      +
     71N  LYS*     3.4     7.9    +      -       +      +
     72N  LEU*     3.2    29.2    +      -       -      +
     33P  GLN*     5.0     1.0    +      -       -      -
     37P  ASP*     2.9    33.5    +      -       -      -
     40P  LEU*     3.4    32.2    -      -       +      +
     41P  ARG*     3.8     3.6    -      -       -      +
     44P  GLU*     2.9    42.8    +      -       -      +
----------------------------------------------------------
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Residues in contact with ILE 69 (chain N). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     65N  PHE*     2.9    23.3    +      -       +      +
     66N  THR*     3.8     4.7    -      -       -      +
     68N  ARG*     1.3    74.3    -      -       -      +
     70N  ASN*     1.3    65.5    +      -       -      +
     72N  LEU*     3.2    10.4    +      -       -      +
     73N  ARG*     3.0    57.3    +      -       -      +
    100O  ILE*     3.9    33.2    -      -       +      +
    103O  SER*     4.2    19.1    -      -       -      -
    104O  ILE*     4.4     7.0    -      -       +      -
    107O  LEU*     4.3    12.1    -      -       +      +
     40P  LEU*     4.0    17.9    -      -       +      -
----------------------------------------------------------
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Residues in contact with ASN 70 (chain N). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     66N  THR*     3.0    39.3    +      -       -      +
     67N  SER*     3.8     7.1    -      -       -      +
     68N  ARG      3.3     0.2    -      -       -      -
     69N  ILE*     1.3    79.0    -      -       -      +
     71N  LYS*     1.3    56.6    +      -       -      +
     73N  ARG*     3.3    29.3    +      -       -      +
     74N  ASP*     2.9    38.6    +      -       -      +
----------------------------------------------------------
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Residues in contact with LYS 71 (chain N). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     67N  SER*     3.0    17.9    +      -       -      +
     68N  ARG*     3.7     8.3    -      -       +      +
     69N  ILE      3.2     0.2    -      -       -      -
     70N  ASN*     1.3    76.5    -      -       -      +
     72N  LEU*     1.3    63.8    +      -       +      +
     74N  ASP*     3.4    11.0    +      -       +      +
     75N  SER*     3.2    22.2    +      -       -      -
     44P  GLU*     6.1     0.9    -      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 72 (chain N). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     68N  ARG      3.2    18.6    +      -       -      +
     69N  ILE      3.2     6.5    +      -       -      +
     71N  LYS*     1.3    74.4    -      -       +      +
     73N  ARG*     1.3    65.2    +      -       -      +
     75N  SER*     2.9    26.4    +      -       -      +
     76N  LEU*     3.1    22.0    +      -       +      +
    107O  LEU*     4.0    22.7    -      -       +      -
     40P  LEU*     3.7    26.7    -      -       +      -
     43P  LEU*     3.9    39.0    -      -       +      +
     44P  GLU*     4.1    20.6    -      -       +      -
----------------------------------------------------------
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Residues in contact with ARG 73 (chain N). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     69N  ILE*     3.0    32.2    +      -       -      +
     70N  ASN*     3.5    26.8    +      -       -      +
     72N  LEU*     1.3    77.4    -      -       -      +
     74N  ASP*     1.3    59.0    +      -       -      +
     76N  LEU      3.1     0.3    +      -       -      -
     77N  PHE*     2.8    52.5    +      -       +      +
     78N  ASN*     4.5     0.2    -      -       -      +
    103O  SER*     3.0    35.0    +      -       -      +
    106O  ASP*     5.8     1.4    +      -       -      +
    107O  LEU*     4.1    17.8    -      -       +      +
----------------------------------------------------------
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Residues in contact with ASP 74 (chain N). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     70N  ASN*     2.9    25.4    +      -       -      +
     71N  LYS*     3.6     9.7    -      -       +      +
     73N  ARG*     1.3    77.2    -      -       -      +
     75N  SER*     1.3    50.9    +      -       -      +
     78N  ASN*     2.7    58.7    +      -       +      +
----------------------------------------------------------
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Residues in contact with SER 75 (chain N). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     71N  LYS*     3.2    12.5    +      -       -      -
     72N  LEU*     2.9    24.0    +      -       -      +
     73N  ARG      3.1     0.2    -      -       -      -
     74N  ASP*     1.3    79.7    -      -       -      +
     76N  LEU*     1.3    66.2    +      -       -      +
     78N  ASN      3.6     8.7    -      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 76 (chain N). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     72N  LEU*     3.1    20.0    +      -       +      +
     75N  SER*     1.3    86.6    -      -       -      +
     77N  PHE*     1.3    77.2    +      -       +      +
     78N  ASN      3.5     0.7    -      -       -      -
    107O  LEU*     3.6    31.4    -      -       +      -
    110O  THR*     3.6    20.2    -      -       -      +
    111O  VAL*     4.4    23.6    -      -       +      -
     43P  LEU*     6.3     0.2    -      -       +      -
----------------------------------------------------------
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Residues in contact with PHE 77 (chain N). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     73N  ARG*     2.8    36.9    +      -       +      +
     76N  LEU*     1.3    92.8    -      -       +      +
     78N  ASN*     1.3    63.2    +      -       -      +
    107O  LEU*     4.8     3.4    -      -       +      -
    110O  THR*     3.7    33.4    -      -       +      -
----------------------------------------------------------
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Residues in contact with ASN 78 (chain N). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     74N  ASP*     2.7    45.4    +      -       -      +
     75N  SER*     3.6    13.0    -      -       -      +
     76N  LEU      3.5     0.9    +      -       -      -
     77N  PHE*     1.3    82.0    +      -       -      +
----------------------------------------------------------
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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