Contacts of the helix formed by residues 25 - 52 (chain F) in PDB entry 5YWB


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 GLY 25 (chain F).
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     24F  ASN*     1.3    74.8    -      -       -      +
     26F  CYS*     1.3    63.8    +      -       -      +
     28F  VAL*     3.1     9.7    +      -       -      +
     29F  ASP*     2.9    22.1    +      -       -      +
    106F  LEU*     5.1     4.7    -      -       -      -
    153F  LYS*     4.6     2.4    +      -       -      -
----------------------------------------------------------
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Residues in contact with CYS 26 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     91E  TRP*     5.6     0.9    -      -       -      -
     95E  PHE*     4.2    18.6    -      -       +      -
     24F  ASN      3.4     0.4    -      -       -      -
     25F  GLY*     1.3    75.0    -      -       -      +
     27F  PHE*     1.3    57.3    +      -       -      +
     29F  ASP*     3.3     8.9    +      -       -      +
     30F  ALA*     2.9    29.6    +      -       -      +
    103F  HIS*     5.7     4.0    -      -       -      -
    105F  HIS*     5.1    13.6    -      -       +      +
    106F  LEU*     3.6    25.3    -      -       -      +
----------------------------------------------------------
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Residues in contact with PHE 27 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     92E  LEU*     4.1    17.4    -      -       +      +
     95E  PHE*     3.4    36.2    -      +       +      -
     96E  ALA*     3.6    31.4    -      -       +      -
     24F  ASN*     3.1    30.4    +      -       +      +
     26F  CYS*     1.3    78.3    -      -       -      +
     28F  VAL*     1.3    67.6    +      -       +      +
     30F  ALA*     3.3     4.7    +      -       -      +
     31F  LEU*     2.9    46.2    +      -       +      +
----------------------------------------------------------
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Residues in contact with VAL 28 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     24F  ASN*     3.2    18.8    -      -       +      +
     25F  GLY*     3.1     7.7    +      -       -      +
     27F  PHE*     1.3    81.7    -      -       +      +
     29F  ASP*     1.3    65.5    +      -       -      +
     31F  LEU*     3.3    10.1    +      -       +      +
     32F  ASN*     2.9    31.7    +      -       -      +
    149F  THR      4.8     0.2    -      -       -      +
    152F  ILE*     3.6    28.9    -      -       +      +
    153F  LYS*     3.5    35.4    -      -       +      +
    156F  LYS*     5.0    13.7    -      -       +      -
----------------------------------------------------------
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Residues in contact with ASP 29 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     25F  GLY      2.9    12.9    +      -       -      +
     26F  CYS*     3.3    12.1    +      -       -      +
     28F  VAL*     1.3    77.0    -      -       -      +
     30F  ALA*     1.3    57.3    +      -       -      +
     32F  ASN*     3.1     5.0    +      -       -      +
     33F  VAL*     2.9    31.8    +      -       -      +
    105F  HIS*     3.2    26.7    -      -       +      +
    106F  LEU*     4.8     7.6    -      -       +      +
    109F  PRO*     3.7    10.9    -      -       +      +
    153F  LYS*     3.5    14.0    -      -       -      +
----------------------------------------------------------
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Residues in contact with ALA 30 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     88E  MET*     5.4     1.7    -      -       +      +
     91E  TRP*     3.6    35.0    -      -       +      -
     92E  LEU*     4.7    10.3    -      -       +      -
     95E  PHE*     5.6     2.0    -      -       +      -
     26F  CYS      2.9    16.6    +      -       -      +
     27F  PHE*     3.7     7.0    -      -       -      +
     29F  ASP*     1.3    75.4    -      -       -      +
     31F  LEU*     1.3    63.5    +      -       -      +
     33F  VAL*     2.9    21.0    +      -       -      +
     34F  VAL*     3.0    19.2    +      -       +      +
    105F  HIS*     6.2     1.5    -      -       +      +
----------------------------------------------------------
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Residues in contact with LEU 31 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     92E  LEU*     4.9    19.0    -      -       +      +
     27F  PHE*     2.9    38.1    +      -       +      +
     28F  VAL*     3.3     9.6    +      -       +      +
     30F  ALA*     1.3    76.1    -      -       -      +
     32F  ASN*     1.3    60.4    +      -       -      +
     34F  VAL*     3.7     8.6    +      -       +      +
     35F  PRO*     3.2    17.5    -      -       +      +
    149F  THR*     3.4    21.8    -      -       +      +
    152F  ILE*     4.9    21.5    -      -       +      -
----------------------------------------------------------
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Residues in contact with ASN 32 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     28F  VAL*     2.9    20.2    +      -       -      +
     29F  ASP      3.5     8.1    -      -       -      +
     31F  LEU*     1.3    76.8    -      -       -      +
     33F  VAL*     1.3    64.7    +      -       -      +
     34F  VAL      3.1     0.4    -      -       -      -
     35F  PRO*     3.1    12.1    -      -       -      +
     36F  HIS*     3.1    23.9    +      -       -      +
    109F  PRO*     4.4    11.1    -      -       +      +
    149F  THR*     3.4    35.0    +      -       -      +
    150F  LYS*     3.4    42.0    -      -       -      +
    153F  LYS*     3.4    23.3    -      -       -      +
----------------------------------------------------------
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Residues in contact with VAL 33 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     88E  MET*     4.2    21.8    -      -       +      -
     29F  ASP      2.9    18.3    +      -       -      +
     30F  ALA*     2.9    11.9    +      -       -      +
     32F  ASN*     1.3    76.4    -      -       -      +
     34F  VAL*     1.3    65.8    +      -       -      +
     35F  PRO      3.5     0.3    -      -       -      -
     36F  HIS*     3.5    11.9    +      -       -      +
     37F  VAL*     3.3    20.9    +      -       +      +
    105F  HIS      5.5     1.1    -      -       -      +
    108F  MET*     4.1    13.2    -      -       +      -
    109F  PRO*     3.8    30.7    -      -       +      -
    112F  MET*     4.1    15.7    -      -       +      -
----------------------------------------------------------
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Residues in contact with VAL 34 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     88E  MET*     4.2    25.1    -      -       +      -
     89E  VAL*     6.1     4.3    -      -       +      -
     92E  LEU*     4.0    30.3    -      -       +      -
     30F  ALA*     3.0    16.5    +      -       +      +
     31F  LEU*     3.8     9.6    -      -       +      +
     33F  VAL*     1.3    76.9    -      -       -      +
     35F  PRO*     1.3    73.9    -      -       +      +
     37F  VAL*     3.0    20.5    +      -       +      +
     38F  PHE*     3.0    14.4    +      -       +      +
----------------------------------------------------------
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Residues in contact with PRO 35 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     31F  LEU*     3.2    15.0    -      -       +      +
     32F  ASN      3.1    23.6    -      -       -      +
     34F  VAL*     1.3    83.1    -      -       +      +
     36F  HIS*     1.3    65.9    +      -       +      +
     38F  PHE*     3.1    11.0    +      -       +      +
     39F  LEU      3.0    18.9    +      -       -      -
    142F  TYR*     3.5    23.2    -      -       +      -
    145F  LEU*     4.2    30.5    -      -       +      +
    146F  ALA*     4.6     5.6    -      -       +      +
    149F  THR*     4.1    17.7    -      -       +      +
----------------------------------------------------------
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Residues in contact with HIS 36 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     32F  ASN*     3.1    35.9    +      -       -      +
     33F  VAL*     3.8     3.6    -      -       -      +
     34F  VAL      3.3     0.4    -      -       -      -
     35F  PRO*     1.3    76.4    -      -       +      +
     37F  VAL*     1.3    56.6    +      -       -      +
     39F  LEU*     3.3     2.1    +      -       -      +
     40F  LEU*     2.9    35.5    +      -       -      +
    109F  PRO*     3.9     8.0    +      -       +      +
    112F  MET*     3.6    32.8    -      -       +      +
    113F  ALA*     3.4    38.6    -      -       +      +
    116F  ALA*     3.6     3.4    -      -       +      +
    142F  TYR*     2.8    36.8    +      +       -      -
    146F  ALA*     5.0     5.6    -      -       +      -
    150F  LYS*     5.6     5.2    +      -       -      -
    179F  TYR*     3.5    11.0    -      +       -      -
----------------------------------------------------------
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Residues in contact with VAL 37 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     85E  LEU*     4.9     6.3    -      -       +      -
     88E  MET*     4.4    29.8    -      -       +      -
     33F  VAL*     3.3    12.4    +      -       +      +
     34F  VAL*     3.0    14.4    +      -       +      +
     36F  HIS*     1.3    77.1    -      -       -      +
     38F  PHE*     1.3    67.1    +      -       -      +
     40F  LEU*     3.4     4.6    +      -       -      -
     41F  PHE*     2.9    63.2    +      -       +      -
    112F  MET*     3.9    21.3    -      -       +      -
----------------------------------------------------------
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Residues in contact with PHE 38 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     85E  LEU*     4.5    25.4    -      -       +      -
     34F  VAL*     3.0    15.0    +      -       +      +
     35F  PRO*     3.1    13.7    +      -       +      +
     37F  VAL*     1.3    79.2    -      -       +      +
     39F  LEU*     1.3    64.6    +      -       +      +
     41F  PHE*     3.2     6.3    +      -       -      +
     42F  ILE*     3.0    58.1    +      -       +      +
    138F  ALA      5.7     2.9    -      -       -      -
    141F  ILE*     5.2    14.6    -      -       +      -
    142F  TYR*     5.4     8.7    -      +       +      -
    145F  LEU*     5.3    14.4    -      -       +      -
----------------------------------------------------------
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Residues in contact with LEU 39 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     35F  PRO      3.0    15.6    +      -       -      +
     36F  HIS*     3.9     3.1    -      -       -      +
     38F  PHE*     1.3    78.7    -      -       +      +
     40F  LEU*     1.3    60.5    +      -       -      +
     41F  PHE      3.0     1.6    -      -       -      -
     42F  ILE*     3.3     7.0    +      -       +      +
     43F  THR*     2.9    28.9    +      -       -      -
    116F  ALA*     3.9    21.8    -      -       +      +
    119F  THR*     3.9    11.9    -      -       +      -
    120F  SER*     4.7     1.1    -      -       -      +
    123F  TYR*     4.5    15.0    -      -       +      -
    138F  ALA*     4.3    13.9    -      -       +      +
    139F  LEU*     4.3    18.6    -      -       +      -
    142F  TYR*     3.5    52.0    -      -       +      -
----------------------------------------------------------
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Residues in contact with LEU 40 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     36F  HIS      2.9    17.6    +      -       -      +
     37F  VAL*     3.9     4.3    -      -       -      +
     39F  LEU*     1.3    75.8    -      -       -      +
     41F  PHE*     1.3    65.8    +      -       +      +
     43F  THR*     3.1     8.0    -      -       +      +
     44F  PHE*     2.9    40.1    -      -       +      -
    112F  MET*     3.7    28.5    -      -       +      +
    115F  MET*     3.3    56.8    -      -       +      +
    116F  ALA*     4.0     4.3    -      -       -      +
    119F  THR*     3.6    20.2    -      -       +      +
----------------------------------------------------------
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Residues in contact with PHE 41 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     81E  CYS*     3.6    45.6    -      -       +      +
     84E  LEU*     3.7    29.6    -      -       +      -
     85E  LEU*     3.4    43.1    -      -       +      -
     88E  MET*     5.8     0.2    -      -       +      -
     37F  VAL*     2.9    48.1    +      -       +      +
     38F  PHE      3.7     3.8    -      -       -      +
     40F  LEU*     1.3    89.5    -      -       +      +
     42F  ILE*     1.3    65.8    +      -       -      +
     43F  THR      3.2     0.2    -      -       -      -
     44F  PHE*     3.6     8.1    +      +       -      +
     45F  PRO*     3.3    17.7    -      -       -      +
    112F  MET*     6.5     0.2    -      -       +      -
----------------------------------------------------------
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Residues in contact with ILE 42 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     85E  LEU*     5.7     3.4    -      -       +      -
     38F  PHE*     3.0    50.9    +      -       +      +
     39F  LEU*     3.3     8.7    +      -       +      +
     41F  PHE*     1.3    75.7    -      -       +      +
     43F  THR*     1.3    64.4    +      -       -      +
     44F  PHE      3.3     0.7    +      -       -      -
     45F  PRO*     3.4    11.7    -      -       -      +
     46F  ILE*     4.2    12.6    +      -       +      +
    123F  TYR*     3.4    18.4    +      -       +      +
    138F  ALA*     5.3    11.4    -      -       +      -
----------------------------------------------------------
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Residues in contact with THR 43 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     39F  LEU      2.9    14.3    +      -       -      +
     40F  LEU*     3.1    24.9    -      -       +      +
     42F  ILE*     1.3    78.6    -      -       -      +
     44F  PHE*     1.3    67.4    +      -       +      +
     46F  ILE*     3.6     2.2    +      -       -      +
     47F  LEU*     2.8    35.2    +      -       +      +
    119F  THR*     3.2    31.7    +      -       +      +
    122F  VAL*     5.1     4.0    -      -       -      +
    123F  TYR*     3.3    34.0    -      -       -      -
----------------------------------------------------------
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Residues in contact with PHE 44 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     77E  MET*     4.1    24.5    -      -       +      -
     81E  CYS*     5.8     2.5    -      -       +      -
     40F  LEU*     2.9    36.8    -      -       +      +
     41F  PHE*     3.6     8.4    +      +       -      +
     43F  THR*     1.3    85.8    -      -       +      +
     45F  PRO*     1.3    68.3    -      -       +      +
     47F  LEU*     4.4     6.1    -      -       +      -
     48F  PHE*     2.9    73.5    +      +       -      -
    115F  MET*     6.3     3.6    -      -       +      -
    119F  THR*     5.6     0.7    -      -       -      -
----------------------------------------------------------
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Residues in contact with PRO 45 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     74E  ILE*     4.2    11.2    -      -       +      +
     77E  MET*     5.2     3.1    -      -       +      -
     78E  SER*     4.4    19.5    -      -       -      +
     81E  CYS*     5.3     8.5    -      -       +      -
     41F  PHE      3.3    17.5    -      -       -      +
     42F  ILE*     3.4    10.8    -      -       -      +
     44F  PHE*     1.3    91.2    -      -       +      +
     46F  ILE*     1.3    60.7    +      -       +      +
     48F  PHE*     3.1     4.9    +      -       +      +
     49F  ILE*     2.9    40.0    +      -       +      +
----------------------------------------------------------
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Residues in contact with ILE 46 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     42F  ILE*     4.3    11.0    -      -       +      +
     43F  THR      3.6     5.5    +      -       -      +
     44F  PHE      3.4     0.2    -      -       -      -
     45F  PRO*     1.3    79.3    -      -       +      +
     47F  LEU*     1.3    59.0    +      -       -      +
     49F  ILE*     3.3    10.3    +      -       +      +
     50F  GLY*     2.9    26.5    +      -       -      -
    123F  TYR*     3.3    29.6    -      -       +      +
    126F  ASN*     4.4    12.9    +      -       +      +
    135F  LEU*     3.7    35.4    -      -       +      -
----------------------------------------------------------
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Residues in contact with LEU 47 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     43F  THR*     2.8    29.0    +      -       +      +
     44F  PHE*     4.0     7.4    -      -       +      +
     46F  ILE*     1.3    76.6    -      -       -      +
     48F  PHE*     1.3    60.9    +      -       +      +
     50F  GLY      3.8     0.5    -      -       -      -
     51F  TRP*     2.9    30.1    +      -       -      +
    122F  VAL*     4.6    17.5    -      -       +      -
    126F  ASN*     4.2    12.7    +      -       -      +
----------------------------------------------------------
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Residues in contact with PHE 48 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     66E  LEU*     4.8     3.5    -      -       -      +
     73E  LEU*     4.8    23.8    -      -       +      -
     74E  ILE*     4.4    19.7    -      -       +      -
     77E  MET*     3.4    40.2    -      -       +      -
     44F  PHE*     2.9    56.1    +      +       -      +
     45F  PRO*     3.7     3.1    -      -       +      +
     47F  LEU*     1.3    80.8    -      -       +      +
     49F  ILE*     1.3    60.4    +      -       -      +
     51F  TRP*     4.2    20.1    -      +       +      +
     52F  GLY*     3.0    24.9    +      -       -      -
----------------------------------------------------------
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Residues in contact with ILE 49 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     59E  VAL*     4.6    34.8    -      -       +      +
     62E  THR*     5.1    16.5    -      -       +      +
     63E  LEU*     4.9    14.1    -      -       +      +
     66E  LEU*     4.9    11.8    -      -       +      +
     74E  ILE*     3.6    20.6    -      -       +      -
     45F  PRO*     2.9    25.2    +      -       +      +
     46F  ILE*     3.8     8.5    -      -       +      +
     48F  PHE*     1.3    76.4    -      -       -      +
     50F  GLY*     1.3    62.9    +      -       -      +
     52F  GLY*     3.4    15.8    +      -       -      -
----------------------------------------------------------
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Residues in contact with GLY 50 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     46F  ILE      2.9    16.1    +      -       -      -
     47F  LEU*     3.8     2.0    -      -       -      -
     49F  ILE*     1.3    78.4    -      -       -      +
     51F  TRP*     1.3    60.0    +      -       -      +
     52F  GLY      4.8     1.4    -      -       -      -
    126F  ASN*     5.2     9.9    -      -       -      -
----------------------------------------------------------
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Residues in contact with TRP 51 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     70E  HIS*     4.0    33.4    -      +       -      -
     73E  LEU*     5.3     9.6    -      -       +      -
     47F  LEU      2.9    19.2    +      -       -      +
     48F  PHE*     4.2    20.0    -      +       +      +
     49F  ILE      3.2     0.2    -      -       -      -
     50F  GLY*     1.3    74.4    -      -       -      +
     52F  GLY*     1.3    70.0    +      -       -      +
----------------------------------------------------------
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Residues in contact with GLY 52 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     66E  LEU*     3.9    33.2    -      -       -      +
     67E  LYS*     5.8     0.5    +      -       -      -
     70E  HIS*     4.6    16.3    +      -       -      -
     48F  PHE      3.0    17.5    +      -       -      -
     49F  ILE      3.4     9.9    +      -       -      -
     50F  GLY      4.8     1.6    -      -       -      -
     51F  TRP*     1.3    92.3    -      -       -      +
----------------------------------------------------------
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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