Contacts of the helix formed by residues 54 - 80 (chain K) in PDB entry 6MZL


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 GLU 54 (chain K).
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     53K  ALA*     1.3    73.7    -      -       -      +
     55K  LYS*     1.3    59.2    +      -       -      +
     56K  ALA      3.4     1.6    -      -       -      +
     57K  SER*     2.3    38.2    +      -       -      +
     58K  VAL*     2.9    15.1    +      -       -      +
    194O  THR*     5.4     1.6    -      -       +      -
    195O  LEU*     3.2    12.9    +      -       -      +
    196O  THR*     3.3    16.0    -      -       -      +
    197O  MET*     3.0    52.4    +      -       -      +
----------------------------------------------------------
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Residues in contact with LYS 55 (chain K). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     53K  ALA*     4.0     3.0    +      -       -      -
     54K  GLU*     1.3    71.8    -      -       -      +
     56K  ALA*     1.3    61.6    +      -       -      +
     58K  VAL*     3.1    10.1    +      -       +      +
     59K  GLU*     3.0    48.5    +      -       +      +
----------------------------------------------------------
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Residues in contact with ALA 56 (chain K). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     54K  GLU      3.4     0.4    -      -       -      -
     55K  LYS*     1.3    82.7    -      -       -      +
     57K  SER*     1.3    55.2    +      -       -      +
     59K  GLU*     3.4     8.6    +      -       -      +
     60K  THR*     2.5    39.4    +      -       -      +
----------------------------------------------------------
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Residues in contact with SER 57 (chain K). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     54K  GLU*     2.3    50.9    +      -       -      +
     56K  ALA*     1.3    76.3    -      -       -      +
     58K  VAL*     1.3    57.3    +      -       -      +
     60K  THR*     3.3     6.9    +      -       -      -
     61K  LEU*     2.9    36.3    +      -       -      +
    195O  LEU*     3.3    17.5    -      -       -      +
    196O  THR      5.5     0.2    -      -       -      -
    197O  MET*     4.8     4.5    -      -       -      -
    200O  LEU*     4.3    24.5    -      -       -      +
----------------------------------------------------------
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Residues in contact with VAL 58 (chain K). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     38K  GLN*     5.6     6.1    -      -       +      +
     41K  VAL*     3.8    24.2    -      -       +      +
     45K  LEU*     4.5     9.6    -      -       +      -
     53K  ALA*     3.8    19.1    -      -       +      -
     54K  GLU      2.9    14.4    +      -       -      +
     55K  LYS*     3.1    11.6    +      -       -      +
     57K  SER*     1.3    81.9    +      -       -      +
     59K  GLU*     1.3    60.8    +      -       +      +
     61K  LEU*     3.2     9.6    +      -       -      +
     62K  THR*     2.8    31.1    +      -       -      +
    195O  LEU*     3.8    19.5    -      -       +      -
----------------------------------------------------------
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Residues in contact with GLU 59 (chain K). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     34K  ARG*     4.6    12.1    +      -       -      +
     38K  GLN*     3.5    34.4    +      -       +      +
     55K  LYS*     3.0    39.2    +      -       +      +
     56K  ALA*     3.9     7.8    -      -       -      +
     58K  VAL*     1.3    80.2    -      -       +      +
     60K  THR*     1.3    57.5    +      -       -      +
     62K  THR*     3.2    10.4    +      -       -      -
     63K  GLU*     2.9    32.5    +      -       +      +
----------------------------------------------------------
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Residues in contact with THR 60 (chain K). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     56K  ALA*     2.5    25.3    +      -       -      +
     57K  SER*     3.6     8.0    -      -       -      -
     58K  VAL      3.2     0.2    -      -       -      -
     59K  GLU*     1.3    74.5    -      -       -      +
     61K  LEU*     1.3    59.6    +      -       +      +
     63K  GLU*     3.2    11.9    +      -       +      +
     64K  MET*     2.9    41.8    +      -       +      +
     42M  PHE*     6.2     3.6    -      -       +      -
     45M  ARG*     5.5     9.2    -      -       -      +
    200O  LEU*     6.2     5.8    -      -       +      -
----------------------------------------------------------
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Residues in contact with LEU 61 (chain K). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     41K  VAL*     5.4     7.2    -      -       +      -
     57K  SER      2.9    18.6    +      -       -      +
     58K  VAL*     3.5     9.0    -      -       +      +
     60K  THR*     1.3    73.0    -      -       -      +
     62K  THR*     1.3    60.2    +      -       -      +
     64K  MET*     3.2    29.8    +      -       +      +
     65K  LEU*     2.8    27.7    +      -       -      +
    163O  ILE*     4.7     9.4    -      -       +      +
    166O  ILE*     4.5    32.8    -      -       +      -
    195O  LEU*     3.9    27.6    -      -       +      -
    200O  LEU*     3.9    25.1    -      -       +      -
    203O  ALA*     5.2     3.6    -      -       +      -
----------------------------------------------------------
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Residues in contact with THR 62 (chain K). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     34K  ARG*     4.1    10.5    -      -       +      +
     37K  LEU*     3.7    34.2    -      -       +      +
     38K  GLN*     3.9    24.3    -      -       +      +
     41K  VAL*     3.3    19.7    -      -       +      +
     58K  VAL*     2.8    18.0    +      -       -      +
     59K  GLU*     3.3    12.7    -      -       -      -
     61K  LEU*     1.3    74.3    -      -       -      +
     63K  GLU*     1.3    60.2    +      -       -      +
     65K  LEU*     3.1     8.6    +      -       +      +
     66K  GLN*     3.0    29.0    +      -       -      +
----------------------------------------------------------
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Residues in contact with GLU 63 (chain K). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     34K  ARG*     3.3    36.6    +      -       -      +
     59K  GLU      2.9    19.7    +      -       -      +
     60K  THR*     3.3    12.8    -      -       +      +
     62K  THR*     1.3    77.6    -      -       -      +
     64K  MET*     1.3    57.5    +      -       +      +
     66K  GLN*     2.4    35.0    +      -       -      +
     67K  SER*     2.9    31.1    +      -       -      -
----------------------------------------------------------
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Residues in contact with MET 64 (chain K). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     60K  THR*     2.9    26.4    +      -       +      +
     61K  LEU*     3.4    34.5    -      -       +      +
     63K  GLU*     1.3    76.1    -      -       +      +
     65K  LEU*     1.3    57.4    +      -       -      +
     67K  SER*     2.6    22.0    +      -       -      +
     68K  TYR*     2.9    16.3    +      -       -      +
    162O  PHE*     4.7    15.7    -      -       +      -
    166O  ILE*     5.9     3.8    -      -       +      -
    200O  LEU*     5.6     1.8    -      -       -      -
    203O  ALA*     4.8    13.7    -      -       +      +
    204O  LEU*     5.3    14.1    -      -       +      -
    206O  GLU*     6.3     2.7    -      -       +      -
    207O  TYR*     5.5    12.6    -      -       +      +
    208O  GLY*     5.8     0.9    -      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 65 (chain K). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     37K  LEU*     5.3    14.8    -      -       +      +
     40K  VAL*     5.4    11.2    -      -       +      -
     41K  VAL*     4.7    13.9    -      -       +      -
     44K  LEU*     5.9     0.9    -      -       +      -
     61K  LEU      2.8    13.2    +      -       -      +
     62K  THR*     3.1    10.1    +      -       -      +
     64K  MET*     1.3    78.3    -      -       -      +
     66K  GLN*     1.3    57.8    +      -       -      +
     68K  TYR*     3.0     8.2    +      -       +      +
     69K  ILE*     2.9    40.4    +      -       +      +
    130O  ILE*     5.9     2.9    -      -       +      -
    159O  ALA*     3.7    27.8    -      -       +      +
    162O  PHE*     3.7    17.2    -      -       +      -
    163O  ILE*     3.7    35.4    -      -       +      -
----------------------------------------------------------
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Residues in contact with GLN 66 (chain K). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     30K  HIS*     5.5     1.0    -      -       -      -
     34K  ARG*     4.5    11.2    -      -       -      +
     37K  LEU*     4.0    18.0    -      -       +      +
     62K  THR      3.0    13.3    +      -       -      +
     63K  GLU*     2.4    47.4    +      -       -      +
     65K  LEU*     1.3    77.3    -      -       -      +
     67K  SER*     1.3    58.3    +      -       -      +
     69K  ILE*     3.3    13.2    +      -       -      +
     70K  SER*     2.9    31.3    +      -       -      -
    138O  TYR*     3.0    40.4    +      -       +      -
    141O  ARG*     4.8     5.1    +      -       -      +
----------------------------------------------------------
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Residues in contact with SER 67 (chain K). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     63K  GLU      2.9    13.0    +      -       -      -
     64K  MET*     2.6    28.5    +      -       -      +
     66K  GLN*     1.3    78.9    -      -       -      +
     68K  TYR*     1.3    55.3    +      -       -      +
     70K  SER*     3.6     8.0    -      -       -      +
     71K  GLU*     2.8    32.5    +      -       -      +
     74K  ARG*     4.6     4.2    +      -       -      +
----------------------------------------------------------
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Residues in contact with TYR 68 (chain K). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     64K  MET      2.9    15.1    +      -       -      +
     65K  LEU*     3.0    14.5    +      -       +      +
     67K  SER*     1.3    75.4    +      -       -      +
     69K  ILE*     1.3    58.8    +      -       -      +
     71K  GLU*     3.2    17.8    +      -       -      +
     72K  ILE*     2.9    54.3    +      -       +      +
     97K  LEU*     4.0    18.0    -      -       +      +
    100K  MET*     3.6    37.7    +      -       +      +
    101K  GLY      5.4     0.5    +      -       -      -
    102K  PHE*     5.2     5.9    -      -       -      +
    158O  ALA*     5.0     4.6    -      -       +      +
    159O  ALA*     4.9     8.7    -      -       +      -
    162O  PHE*     4.2    52.8    -      +       +      -
    206O  GLU*     6.5     1.3    -      -       +      -
----------------------------------------------------------
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Residues in contact with ILE 69 (chain K). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     37K  LEU*     5.0    15.7    -      -       +      -
     65K  LEU*     2.9    31.0    +      -       +      +
     66K  GLN*     3.4    18.2    -      -       +      +
     68K  TYR*     1.3    76.5    -      -       -      +
     70K  SER*     1.3    57.2    +      -       -      +
     72K  ILE*     3.2    15.4    +      -       +      +
     73K  GLY*     2.9    23.4    +      -       -      -
    130O  ILE*     6.4     1.6    -      -       +      -
    135O  THR*     5.0    11.0    -      -       +      +
    138O  TYR*     4.0    29.6    -      -       +      -
    139O  LEU*     4.0    22.3    -      -       +      +
    155O  ILE*     5.1     8.1    -      -       +      -
    159O  ALA*     4.8    15.0    -      -       +      -
----------------------------------------------------------
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Residues in contact with SER 70 (chain K). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     66K  GLN      2.9    17.8    +      -       -      -
     67K  SER*     3.8     7.4    -      -       -      -
     69K  ILE*     1.3    76.1    -      -       -      +
     71K  GLU*     1.3    57.4    +      -       -      +
     73K  GLY*     3.2     0.5    +      -       -      -
     74K  ARG*     2.8    45.8    +      -       -      +
    138O  TYR*     4.4    18.0    +      -       -      -
    141O  ARG*     4.8    13.7    +      -       -      +
    142O  ALA*     3.9    16.0    +      -       -      +
----------------------------------------------------------
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Residues in contact with GLU 71 (chain K). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     67K  SER*     2.8    21.8    +      -       -      +
     68K  TYR*     3.4    19.7    -      -       -      +
     69K  ILE      3.2     0.2    -      -       -      -
     70K  SER*     1.3    74.6    -      -       -      +
     72K  ILE*     1.3    58.5    +      -       -      +
     74K  ARG*     3.4    25.9    +      -       -      +
     75K  SER*     2.7    36.9    +      -       -      +
    100K  MET*     3.7    18.2    -      -       +      +
    207O  TYR*     4.3    23.2    +      -       -      -
----------------------------------------------------------
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Residues in contact with ILE 72 (chain K). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     68K  TYR*     2.9    43.9    +      -       +      +
     69K  ILE*     3.3    11.2    -      -       +      +
     71K  GLU*     1.3    75.7    -      -       -      +
     73K  GLY*     1.3    58.3    +      -       -      +
     75K  SER*     3.3     2.1    +      -       -      -
     76K  ALA*     2.9    32.4    +      -       +      +
     93K  ILE*     4.9     8.1    -      -       +      -
     96K  THR*     4.4     9.5    -      -       +      +
     97K  LEU*     4.4    12.8    -      -       +      -
    100K  MET*     3.6    24.2    -      -       +      +
    139O  LEU*     5.2     1.8    -      -       +      -
    155O  ILE*     3.8    48.9    -      -       +      +
    158O  ALA*     5.6     1.1    -      -       +      -
    159O  ALA*     5.8     1.1    -      -       +      +
----------------------------------------------------------
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Residues in contact with GLY 73 (chain K). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     69K  ILE      2.9    11.6    +      -       -      -
     70K  SER      3.2     0.2    +      -       -      -
     71K  GLU      3.2     0.4    -      -       -      -
     72K  ILE*     1.3    75.4    -      -       -      +
     74K  ARG*     1.3    58.6    +      -       -      +
     76K  ALA*     4.1     4.3    -      -       -      +
     77K  LYS*     2.8    31.4    +      -       -      +
    139O  LEU*     4.3     9.2    -      -       -      -
    142O  ALA*     3.1    32.2    -      -       -      +
    143O  GLY      5.2     0.3    -      -       -      -
    144O  PHE*     5.1     4.5    -      -       -      +
----------------------------------------------------------
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Residues in contact with ARG 74 (chain K). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    543G  SER*     4.6    18.8    -      -       -      +
     67K  SER*     4.6     3.6    +      -       -      +
     70K  SER*     2.8    35.1    +      -       -      +
     71K  GLU*     3.5    40.0    +      -       -      +
     73K  GLY*     1.3    70.4    -      -       -      +
     75K  SER*     1.3    60.4    +      -       -      +
     77K  LYS*     3.3    10.0    -      -       +      +
     78K  SER*     3.0    32.2    +      -       -      -
    142O  ALA*     4.5     0.9    -      -       +      +
----------------------------------------------------------
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Residues in contact with SER 75 (chain K). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     71K  GLU*     2.7    25.1    +      -       -      +
     72K  ILE      3.6     3.6    -      -       -      -
     74K  ARG*     1.3    76.7    -      -       -      +
     76K  ALA*     1.3    52.2    +      -       -      +
     78K  SER*     3.8     1.7    -      -       -      -
     79K  TYR*     2.8    39.4    +      -       -      +
     96K  THR*     3.7    20.0    -      -       -      -
     99K  GLU*     6.3     2.0    -      -       -      -
    100K  MET*     3.6    14.7    -      -       -      +
----------------------------------------------------------
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Residues in contact with ALA 76 (chain K). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     72K  ILE*     2.9    18.6    +      -       +      +
     73K  GLY*     4.2     4.0    -      -       -      +
     75K  SER*     1.3    73.6    -      -       -      +
     77K  LYS*     1.3    60.8    +      -       -      +
     79K  TYR*     4.0     5.4    -      -       -      -
     80K  CYS*     2.9    36.1    +      -       -      +
     88K  PRO*     4.5    10.7    -      -       +      +
     93K  ILE*     3.7    29.6    -      -       +      -
     96K  THR*     4.3     9.1    -      -       +      +
    144O  PHE*     5.0     8.5    -      -       +      -
----------------------------------------------------------
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Residues in contact with LYS 77 (chain K). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    541G  GLY      3.2    27.8    -      -       -      +
    542G  HIS*     3.7     2.0    -      -       -      +
    543G  SER*     3.3    35.7    -      -       -      +
    564G  ASP*     4.1    11.9    +      -       -      +
    566G  THR*     4.5    12.5    -      -       -      +
    568G  ARG*     4.0    11.7    -      -       -      +
    582G  LYS*     6.3     0.6    -      -       -      +
     73K  GLY      2.8    20.4    +      -       -      +
     74K  ARG*     3.3    11.2    -      -       +      +
     76K  ALA*     1.3    79.6    -      -       -      +
     78K  SER*     1.3    66.2    +      -       -      +
     79K  TYR      3.2     0.3    +      -       -      -
     80K  CYS*     4.1     0.7    -      -       -      +
     81K  GLU*     3.3    36.6    +      -       -      +
     88K  PRO*     6.0     1.3    -      -       -      -
    142O  ALA      4.2     7.6    -      -       -      +
    143O  GLY      4.6     8.3    -      -       -      +
    144O  PHE*     6.1     1.2    -      -       -      +
----------------------------------------------------------
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Residues in contact with SER 78 (chain K). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    582G  LYS*     5.0    11.2    +      -       -      -
     74K  ARG      3.0    11.9    +      -       -      -
     75K  SER*     4.4     1.6    -      -       -      -
     77K  LYS*     1.3    84.9    -      -       -      +
     79K  TYR*     1.3    57.6    +      -       -      +
     80K  CYS      3.6     0.2    -      -       -      -
     81K  GLU*     4.0    19.8    +      -       -      +
     82K  HIS*     3.1    23.8    +      -       -      -
----------------------------------------------------------
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Residues in contact with TYR 79 (chain K). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    919E  GLU*     4.4    10.0    +      -       +      +
    922E  GLN*     5.4     2.3    -      -       -      +
    923E  GLN*     3.3    44.2    +      -       +      +
     75K  SER      2.8    23.3    +      -       -      +
     76K  ALA*     3.9     4.3    -      -       -      +
     77K  LYS      3.1     0.4    -      -       -      -
     78K  SER*     1.3    80.2    -      -       -      +
     80K  CYS*     1.3    69.2    +      -       -      +
     81K  GLU      3.3     2.2    -      -       -      -
     82K  HIS*     3.0    27.7    -      +       -      +
     83K  THR*     4.7     0.3    +      -       -      +
     92K  ASP*     4.6    13.5    -      -       +      -
     95K  VAL*     3.3    32.8    -      -       +      +
     96K  THR*     4.5    13.0    -      -       -      +
     99K  GLU*     6.0     7.9    -      -       +      -
----------------------------------------------------------
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Residues in contact with CYS 80 (chain K). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     76K  ALA*     2.9    19.1    +      -       -      +
     77K  LYS      4.1     0.7    -      -       -      +
     79K  TYR*     1.3    82.9    -      -       -      +
     81K  GLU*     1.3    56.7    +      -       -      +
     82K  HIS      3.1     5.2    -      -       -      +
     83K  THR*     2.7    30.0    +      -       +      +
     85K  ARG      3.0     8.1    -      -       -      +
     86K  THR*     3.4    22.0    -      -       -      +
     87K  GLN      4.9     0.9    -      -       -      +
     88K  PRO*     3.6    27.1    -      -       +      -
     92K  ASP*     3.6    32.3    -      -       -      -
----------------------------------------------------------
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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