Contacts of the helix formed by residues 8 - 34 (chain P) in PDB entry 5VAI


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 ALA 8 (chain P).
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
      7P  HIS*     1.3    88.6    -      -       +      +
      9P  GLU*     1.3    58.4    +      -       -      +
     11P  THR*     4.8     1.4    -      -       -      -
     12P  PHE*     4.4     5.5    +      -       -      +
    237R  VAL*     4.1     2.0    -      -       -      +
    241R  TYR*     3.3    35.4    -      -       +      +
    313R  ILE*     5.8     0.9    -      -       +      -
    364R  GLU*     4.7     5.6    -      -       -      +
    367R  PHE*     6.1     5.6    -      -       +      -
    384R  LEU*     5.2     5.2    -      -       -      +
    387R  GLU*     5.7     4.1    -      -       -      +
    388R  LEU*     3.3    16.7    -      -       -      +
    391R  THR*     5.8     1.8    -      -       +      -
----------------------------------------------------------
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Residues in contact with GLU 9 (chain P). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
      7P  HIS      3.8     1.0    -      -       -      +
      8P  ALA*     1.3    77.3    -      -       -      +
     10P  GLY*     1.3    70.8    +      -       -      +
     12P  PHE*     3.4    10.0    +      -       +      +
     13P  THR*     3.1    16.4    +      -       -      -
    145R  TYR*     4.8     8.6    +      -       +      -
    190R  ARG*     3.7    23.0    +      -       -      +
    194R  VAL*     3.2    37.0    -      -       -      +
    233R  MET*     3.4    22.0    -      -       +      +
    237R  VAL*     4.3     9.1    -      -       +      +
    241R  TYR*     4.7     1.9    +      -       -      +
    388R  LEU*     3.3    32.5    -      -       +      +
    391R  THR*     5.8     0.7    -      -       +      -
    392R  SER*     4.4     5.8    +      -       -      -
----------------------------------------------------------
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Residues in contact with GLY 10 (chain P). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
      7P  HIS*     3.1    20.5    -      -       -      +
      9P  GLU*     1.3    76.4    -      -       -      +
     11P  THR*     1.3    52.5    +      -       -      +
     13P  THR*     2.2    46.1    +      -       -      +
     14P  SER*     2.7    11.2    +      -       -      -
    233R  MET*     4.7    10.1    -      -       -      +
    234R  GLN*     5.1     5.8    -      -       -      -
----------------------------------------------------------
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Residues in contact with THR 11 (chain P). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
      7P  HIS*     2.8    18.3    +      -       -      +
      8P  ALA*     4.8     2.5    -      -       -      -
     10P  GLY*     1.3    66.4    -      -       -      -
     12P  PHE*     1.3    63.1    +      -       -      +
     14P  SER*     3.0    21.4    +      -       -      -
     15P  ASP*     3.1    12.5    +      -       -      +
    234R  GLN*     5.9     0.2    -      -       -      +
    299R  ARG*     2.3    44.1    +      -       +      +
    300R  ASN*     4.4    22.0    +      -       -      +
    306R  TRP*     4.0    20.5    +      -       +      -
    376R  ARG*     6.4     2.7    -      -       +      -
----------------------------------------------------------
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Residues in contact with PHE 12 (chain P). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
      8P  ALA      4.4     2.3    +      -       -      +
      9P  GLU*     3.4     8.8    +      -       +      +
     10P  GLY      2.8     2.6    +      -       -      -
     11P  THR*     1.3    79.2    -      -       -      +
     13P  THR*     1.3    65.9    +      -       -      +
     15P  ASP*     3.7     7.4    +      -       +      +
     16P  VAL*     3.1    34.6    +      -       +      +
    142R  LEU*     4.6    19.1    -      -       +      -
    145R  TYR*     4.2    16.4    -      +       +      -
    381R  PHE*     4.1    29.8    -      +       -      -
    384R  LEU*     4.7    12.5    -      -       +      +
    385R  PHE*     3.3    42.6    -      +       +      -
    388R  LEU*     3.6    32.8    -      -       +      -
----------------------------------------------------------
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Residues in contact with THR 13 (chain P). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
      9P  GLU*     3.1    10.6    +      -       +      +
     10P  GLY*     2.2    48.1    +      -       -      +
     12P  PHE*     1.3    73.4    -      -       -      +
     14P  SER*     1.3    59.5    +      -       -      +
     15P  ASP      3.1     2.0    -      -       -      -
     16P  VAL*     2.7    31.0    +      -       -      +
     17P  SER*     2.8    14.4    +      -       -      -
    197R  LYS*     2.2    50.5    +      -       +      -
    230R  PHE*     5.2     7.4    -      -       +      -
    233R  MET*     5.6     5.8    -      -       +      -
----------------------------------------------------------
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Residues in contact with SER 14 (chain P). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     10P  GLY      2.7     9.1    +      -       -      -
     11P  THR*     3.2    17.3    -      -       -      -
     13P  THR*     1.3    79.8    -      -       -      +
     15P  ASP*     1.3    61.5    +      -       -      +
     17P  SER*     2.7    23.7    +      -       -      -
     18P  SER*     3.0    13.0    +      -       -      -
    297R  TRP*     3.5     4.5    +      -       -      +
    298R  THR*     2.9    35.1    +      -       -      -
    299R  ARG*     2.9    15.3    +      -       -      +
    300R  ASN*     4.8     4.8    +      -       -      -
----------------------------------------------------------
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Residues in contact with ASP 15 (chain P). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     11P  THR      3.1    10.0    +      -       -      +
     12P  PHE*     3.7    13.7    -      -       +      +
     13P  THR      3.1     0.6    -      -       -      -
     14P  SER*     1.3    77.0    -      -       -      +
     16P  VAL*     1.3    63.2    +      -       +      +
     18P  SER*     2.9    24.3    +      -       -      -
     19P  TYR*     3.0    42.2    +      -       -      -
    138R  GLU*     4.8     2.4    -      -       -      +
    298R  THR*     4.9     0.4    -      -       -      -
    300R  ASN*     5.2    13.6    +      -       -      +
    381R  PHE*     4.7    15.3    -      -       +      -
----------------------------------------------------------
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Residues in contact with VAL 16 (chain P). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     12P  PHE*     3.1    35.4    -      -       +      +
     13P  THR*     2.7    28.3    +      -       -      +
     15P  ASP*     1.3    72.4    -      -       +      +
     17P  SER*     1.3    54.2    +      -       -      +
     19P  TYR*     3.1     7.6    +      -       -      +
     20P  LEU*     2.9    26.1    +      -       +      +
    142R  LEU*     3.3    36.8    -      -       +      -
    146R  ILE*     5.2    14.6    -      -       +      -
    197R  LYS*     5.2     0.7    -      -       -      +
    201R  LEU*     4.6    11.0    -      -       +      -
----------------------------------------------------------
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Residues in contact with SER 17 (chain P). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     13P  THR      2.8     8.7    +      -       -      -
     14P  SER*     2.7    23.6    +      -       -      -
     16P  VAL*     1.3    73.9    -      -       -      +
     18P  SER*     1.3    60.5    +      -       -      +
     20P  LEU*     3.5     9.6    -      -       -      +
     21P  GLU*     2.8    35.6    +      -       -      +
    201R  LEU*     4.3    24.1    -      -       -      +
    204R  MET*     5.9     0.2    -      -       -      +
    230R  PHE*     5.7     4.9    -      -       -      -
    296R  CYS*     5.7     4.7    -      -       -      -
    297R  TRP      3.0    21.5    +      -       -      -
    298R  THR*     4.8     0.3    -      -       -      -
----------------------------------------------------------
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Residues in contact with SER 18 (chain P). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     14P  SER      3.0     7.5    +      -       -      -
     15P  ASP*     2.9    20.4    +      -       -      -
     17P  SER*     1.3    76.5    +      -       -      +
     19P  TYR*     1.3    62.2    +      -       -      +
     21P  GLU*     3.3     9.3    +      -       -      +
     22P  GLY*     3.0    23.4    +      -       -      -
     29R  THR*     5.3    18.8    -      -       -      +
    298R  THR*     2.5    36.7    +      -       -      +
----------------------------------------------------------
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Residues in contact with TYR 19 (chain P). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     15P  ASP*     3.0    40.3    +      -       -      -
     16P  VAL      3.1     6.3    +      -       -      +
     18P  SER*     1.3    76.2    -      -       -      +
     20P  LEU*     1.3    60.9    +      -       -      +
     22P  GLY*     4.4     1.3    -      -       -      +
     23P  GLN*     2.9    47.3    +      -       +      +
    136R  SER*     6.0     0.2    -      -       -      -
    138R  GLU*     2.7    46.8    +      -       +      -
    139R  GLU*     4.0     4.0    -      -       -      -
    142R  LEU*     3.5    31.9    -      -       +      -
----------------------------------------------------------
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Residues in contact with LEU 20 (chain P). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     16P  VAL*     2.9    15.3    +      -       +      +
     17P  SER*     3.2     9.8    +      -       -      +
     19P  TYR*     1.3    76.2    -      -       -      +
     21P  GLU*     1.3    56.7    -      -       -      +
     23P  GLN*     4.9     7.9    -      -       +      +
     24P  ALA*     2.8    37.8    +      -       +      +
    201R  LEU*     3.7    42.8    -      -       +      +
    204R  MET*     3.3    33.0    -      -       +      -
    205R  TYR*     4.2    35.0    -      -       +      +
----------------------------------------------------------
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Residues in contact with GLU 21 (chain P). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     17P  SER*     2.8    22.1    +      -       -      +
     18P  SER*     3.6     7.0    -      -       -      +
     20P  LEU*     1.3    74.6    -      -       -      +
     22P  GLY*     1.3    58.2    +      -       -      +
     24P  ALA*     3.9     3.2    -      -       -      +
     25P  ALA*     2.9    30.5    +      -       -      +
     30R  VAL      4.0    14.1    -      -       -      +
     31R  SER*     3.3    13.1    -      -       -      -
     32R  LEU*     2.5    45.7    +      -       -      +
     33R  SER      4.5     0.2    +      -       -      -
    204R  MET*     3.4    31.5    -      -       -      +
    296R  CYS*     6.1     0.3    -      -       -      +
----------------------------------------------------------
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Residues in contact with GLY 22 (chain P). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     18P  SER      3.0    14.8    +      -       -      -
     19P  TYR*     3.3     3.8    +      -       -      -
     21P  GLU*     1.3    76.7    -      -       -      +
     23P  GLN*     1.3    56.5    +      -       -      +
     25P  ALA*     3.1     6.4    +      -       -      +
     26P  LYS*     2.9    34.5    +      -       -      +
     29R  THR*     5.4     8.3    -      -       -      -
     30R  VAL      4.3     7.3    +      -       -      -
----------------------------------------------------------
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Residues in contact with GLN 23 (chain P). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     19P  TYR*     2.9    34.0    +      -       +      +
     20P  LEU*     4.1     8.6    -      -       +      +
     22P  GLY*     1.3    72.7    -      -       -      -
     24P  ALA*     1.3    56.6    +      -       -      +
     26P  LYS*     3.2    11.1    +      -       -      +
     27P  GLU*     2.9    34.3    +      -       +      +
    139R  GLU*     3.9    21.0    +      -       -      -
    142R  LEU*     5.7     0.4    -      -       -      +
    205R  TYR*     5.3    10.1    -      -       +      -
----------------------------------------------------------
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Residues in contact with ALA 24 (chain P). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     20P  LEU*     2.8    28.8    +      -       +      +
     21P  GLU*     3.9     5.6    -      -       -      +
     23P  GLN*     1.3    73.8    -      -       -      +
     25P  ALA*     1.3    60.2    +      -       -      +
     27P  GLU*     3.2    10.0    +      -       -      +
     28P  PHE*     2.9    27.0    +      -       -      +
     32R  LEU*     5.3    13.7    -      -       +      +
    204R  MET*     5.3     8.7    -      -       +      -
    208R  ALA*     4.7    18.7    -      -       +      +
    212R  HIS*     5.4     3.8    -      -       +      -
    215R  ASP*     5.7     1.8    -      -       -      +
----------------------------------------------------------
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Residues in contact with ALA 25 (chain P). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     21P  GLU      2.9    19.5    +      -       -      +
     22P  GLY*     3.4     6.5    -      -       -      +
     24P  ALA*     1.3    75.0    -      -       -      +
     26P  LYS*     1.3    58.6    +      -       +      +
     28P  PHE*     3.1    10.9    +      -       -      +
     29P  ILE*     2.9    33.9    +      -       +      +
     30R  VAL*     4.8     8.3    -      -       +      +
     32R  LEU*     5.1     8.2    -      -       -      +
     35R  THR*     3.9    28.2    -      -       +      +
     90R  PRO*     5.2    10.1    -      -       +      -
----------------------------------------------------------
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Residues in contact with LYS 26 (chain P). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     22P  GLY      2.9    23.6    +      -       -      +
     23P  GLN*     3.4    10.5    -      -       -      +
     25P  ALA*     1.3    77.7    -      -       +      +
     27P  GLU*     1.3    57.6    +      -       +      +
     29P  ILE*     2.9    28.9    +      -       +      +
     30P  ALA*     2.9    16.0    +      -       -      +
     90R  PRO*     5.4     4.7    -      -       +      -
     91R  TRP*     3.4    34.8    -      -       +      -
    128R  GLU*     2.7    27.0    +      -       -      +
----------------------------------------------------------
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Residues in contact with GLU 27 (chain P). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     23P  GLN*     2.9    20.5    +      -       +      +
     24P  ALA*     3.2    11.9    +      -       -      +
     26P  LYS*     1.3    76.0    -      -       +      +
     28P  PHE*     1.3    57.8    +      -       -      +
     30P  ALA*     3.5     8.9    +      -       -      +
     31P  TRP*     2.9    32.7    +      -       -      +
    205R  TYR*     6.0     6.6    -      -       +      -
    208R  ALA*     5.2    16.4    -      -       +      +
    212R  HIS*     4.9     3.4    -      -       +      -
----------------------------------------------------------
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Residues in contact with PHE 28 (chain P). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     24P  ALA      2.9    13.2    +      -       -      +
     25P  ALA*     3.1    11.4    +      -       -      +
     27P  GLU*     1.3    76.8    -      -       -      +
     29P  ILE*     1.3    64.4    +      -       +      +
     31P  TRP*     3.6    21.0    -      +       -      +
     32P  LEU*     2.8    52.0    +      -       +      +
     37P  GLY      5.4     0.2    -      -       -      -
     32R  LEU*     5.1     6.5    -      -       +      -
     35R  THR*     4.0    23.1    -      -       +      -
     36R  VAL*     5.3    11.9    -      -       +      -
     39R  TRP*     3.9    41.5    -      +       +      -
     88R  TYR*     5.1     6.1    -      +       -      -
    212R  HIS*     3.0    36.9    +      +       +      +
    213R  GLN*     6.0     2.5    -      -       -      -
----------------------------------------------------------
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Residues in contact with ILE 29 (chain P). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     25P  ALA*     3.1    17.3    -      -       +      +
     26P  LYS*     2.9    21.6    +      -       +      +
     28P  PHE*     1.3    87.6    -      -       +      +
     30P  ALA*     1.3    58.2    +      -       -      +
     32P  LEU*     4.7     1.6    -      -       -      -
     33P  VAL*     2.8    51.0    +      -       +      +
     35R  THR*     5.4     4.0    -      -       +      -
     88R  TYR*     5.7     9.0    -      -       +      -
     89R  LEU*     5.3     4.5    -      -       +      -
     90R  PRO*     4.4    17.9    -      -       +      -
     91R  TRP*     4.0    30.7    -      -       +      -
----------------------------------------------------------
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Residues in contact with ALA 30 (chain P). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     26P  LYS      2.9    14.4    +      -       -      +
     27P  GLU*     4.1    11.2    -      -       -      +
     29P  ILE*     1.3    76.7    -      -       -      +
     31P  TRP*     1.3    54.7    +      -       -      +
     33P  VAL*     4.9     2.0    -      -       -      -
     34P  LYS*     2.7    40.9    +      -       +      +
----------------------------------------------------------
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Residues in contact with TRP 31 (chain P). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     27P  GLU*     2.9    20.8    +      -       -      +
     28P  PHE*     3.6    20.0    -      +       -      +
     30P  ALA*     1.3    78.2    -      -       -      +
     32P  LEU*     1.3    60.0    +      -       -      +
     34P  LYS      3.2    12.9    -      -       -      +
     36P  ARG*     2.7    51.8    +      -       +      +
     37P  GLY*     3.3    33.4    -      -       -      -
    210R  GLN      5.6     2.2    +      -       -      -
    211R  GLN*     3.2    40.6    +      -       -      -
    212R  HIS*     3.2    35.2    -      +       +      +
    213R  GLN*     4.8    12.3    -      -       -      -
----------------------------------------------------------
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Residues in contact with LEU 32 (chain P). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     28P  PHE*     2.8    41.1    +      -       +      +
     29P  ILE*     4.0     2.2    -      -       -      +
     31P  TRP*     1.3    75.2    -      -       -      +
     33P  VAL*     1.3    67.8    +      -       +      +
     34P  LYS*     4.5     0.7    -      -       -      -
     35P  GLY      4.7     3.6    -      -       -      +
     37P  GLY*     3.2    39.0    +      -       -      +
     39R  TRP*     3.8    20.4    -      -       +      +
     67R  ASP      4.7     5.9    -      -       -      +
     68R  ASP*     3.1    39.8    -      -       +      +
     69R  TYR*     3.4    23.1    -      -       +      -
     88R  TYR*     4.9     2.2    -      -       -      +
----------------------------------------------------------
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Residues in contact with VAL 33 (chain P). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     29P  ILE*     2.8    39.7    +      -       +      +
     30P  ALA*     4.4     2.2    -      -       -      +
     32P  LEU*     1.3    79.4    -      -       +      +
     34P  LYS*     1.3    61.7    +      -       +      +
     35P  GLY      4.3     1.0    +      -       -      +
     67R  ASP      5.4     3.0    -      -       -      +
     69R  TYR*     3.9    24.7    -      -       +      +
     86R  PRO*     6.4     1.1    -      -       +      -
     88R  TYR*     6.0     0.4    -      -       -      +
    118R  LEU*     5.7     3.1    -      -       -      +
    121R  ARG*     4.4    18.3    +      -       -      +
    123R  LEU*     3.6    30.5    -      -       +      -
----------------------------------------------------------
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Residues in contact with LYS 34 (chain P). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     30P  ALA*     2.7    26.9    +      -       +      +
     31P  TRP*     3.2     6.7    -      -       -      +
     33P  VAL*     1.3    83.3    -      -       +      +
     35P  GLY*     1.3    72.2    +      -       -      +
    113R  LYS*     5.5     3.1    -      -       -      +
    118R  LEU*     3.9    29.2    -      -       +      -
    121R  ARG*     5.0     5.2    -      -       -      +
----------------------------------------------------------
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A short description of the analytical approach
The contact analysis used in this page is based upon the approach developed in: Sobolev V., Wade R.C., Vriend G. and Edelman M. PROTEINS (1996) 25, 120-129. Contact legitimacy depends on the hydrophobic-hydrophilic properties of the contacting atoms. In order to define it, for each inter-atomic contact, eight atom classes have been introduced:


   I  Hydrophilic      - N and O that can donate and accept hydrogen bonds
                         (e.g., oxygen of hydroxyl group of Ser. or Thr)
  II  Acceptor         - N or O that can only accept a hydrogen bond
 III  Donor            - N that can only donate a hydrogen bond
  IV  Hydrophobic      - Cl, Br, I and all C atoms that are not in
                         aromatic rings and do not have a covalent bond to
                         a N or O atom
   V  Aromatic         - C in aromatic rings irrespective of any other 
                         bonds formed by the atom
  VI  Neutral          - C atoms that have a covalent bond to at least one
                         atom of class I or two or more atoms from class II
                         or III; atoms; S, F, P, and metal atoms in all cases
 VII  Neutral-donor    - C atoms that have a covalent bond with only one
                         atom of class III
VIII  Neutral-acceptor - C atoms that have a covalent bond with only 
                         one atom of class II
For each pair of contacts the state of legitimacy is shown below:

Legend:
+, legitimate
-, illegitimate
------------------------------------------------------------
  Atomic class           I  II  III   IV   V   VI  VII  VIII
------------------------------------------------------------
   I  (Hydrophilic)      +   +    +    -   +   +    +    +
  II  (Acceptor)         +   -    +    -   +   +    +    -
 III  (Donor)            +   +    -    -   +   +    -    +
  IV  (Hydrophobic)      -   -    -    +   +   +    +    +
   V  (Aromatic)         +   +    +    +   +   +    +    +
  VI  (Neutral)          +   +    +    +   +   +    +    +
 VII  (Neutral-donor)    +   +    -    +   +   +    -    +
VIII  (Neutral-acceptor) +   -    +    +   +   +    +    -
------------------------------------------------------------
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