Contacts of the helix formed by residues 2 - 35 (chain A) in PDB entry 6LVN


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 ILE 2 (chain A).
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
      3A  SER*     1.3    69.3    +      -       -      +
      4A  GLY      3.2     5.4    -      -       -      +
      5A  ILE*     3.1    38.4    +      -       +      +
      6A  ASN*     3.0    45.5    +      -       -      +
----------------------------------------------------------
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Residues in contact with SER 3 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
      2A  ILE*     1.3    85.2    -      -       -      +
      4A  GLY*     1.3    55.4    +      -       -      +
      6A  ASN*     3.4    13.5    +      -       -      +
      7A  ALA*     2.9    29.1    +      -       -      +
----------------------------------------------------------
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Residues in contact with GLY 4 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
      2A  ILE      3.2     3.4    -      -       -      +
      3A  SER*     1.3    78.1    -      -       -      +
      5A  ILE*     1.3    57.2    +      -       -      +
      7A  ALA*     3.5     6.3    +      -       -      +
      8A  SER*     2.9    32.7    +      -       -      -
----------------------------------------------------------
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Residues in contact with ILE 5 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
      2A  ILE*     3.1    37.5    +      -       +      +
      4A  GLY*     1.3    74.8    -      -       -      +
      6A  ASN*     1.3    64.8    +      -       -      +
      8A  SER*     3.2     7.4    +      -       -      -
      9A  VAL*     2.9    34.1    +      -       +      +
     33C  LEU*     3.5    45.1    -      -       +      +
     34C  GLN*     5.6     0.2    -      -       -      -
----------------------------------------------------------
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Residues in contact with ASN 6 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
      2A  ILE*     3.0    31.3    +      -       -      +
      3A  SER*     3.8    15.8    +      -       -      +
      5A  ILE*     1.3    78.8    -      -       -      +
      7A  ALA*     1.3    62.0    +      -       -      +
      9A  VAL*     3.2    11.0    +      -       -      +
     10A  VAL*     3.0    27.3    +      -       +      +
----------------------------------------------------------
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Residues in contact with ALA 7 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
      3A  SER      2.9    19.3    +      -       -      +
      4A  GLY*     3.8     7.0    -      -       -      +
      6A  ASN*     1.3    75.6    -      -       -      +
      8A  SER*     1.3    57.4    +      -       -      +
     10A  VAL*     3.3     6.4    +      -       -      +
     11A  ASN*     2.8    45.5    +      -       -      +
----------------------------------------------------------
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Residues in contact with SER 8 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
      4A  GLY      2.9    19.7    +      -       -      -
      5A  ILE*     3.5     8.5    -      -       -      -
      7A  ALA*     1.3    76.3    -      -       -      +
      9A  VAL*     1.3    57.8    +      -       -      +
     11A  ASN*     4.1     6.2    -      -       -      +
     12A  ILE*     2.9    48.0    +      -       -      +
     33C  LEU*     4.6     9.9    -      -       -      -
----------------------------------------------------------
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Residues in contact with VAL 9 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
      5A  ILE*     2.9    23.9    +      -       +      +
      6A  ASN*     3.2    10.9    +      -       -      +
      8A  SER*     1.3    76.6    -      -       -      +
     10A  VAL*     1.3    66.9    +      -       +      +
     13A  GLN*     3.0    24.1    +      -       +      +
     30C  LEU*     3.7    24.3    -      -       +      +
     33C  LEU*     3.9    26.7    -      -       +      -
     34C  GLN*     4.0    34.8    -      -       +      +
----------------------------------------------------------
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Residues in contact with VAL 10 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
      6A  ASN*     3.0    16.5    +      -       +      +
      7A  ALA*     3.7     9.6    -      -       -      +
      9A  VAL*     1.3    79.4    -      -       +      +
     11A  ASN*     1.3    72.3    +      -       -      +
     13A  GLN*     3.3     7.2    +      -       -      +
     14A  LYS*     3.0    32.7    +      -       +      +
----------------------------------------------------------
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Residues in contact with ASN 11 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
      7A  ALA*     2.8    30.5    +      -       -      +
      8A  SER*     4.1     5.3    -      -       -      +
     10A  VAL*     1.3    84.8    -      -       -      +
     12A  ILE*     1.3    64.4    +      -       +      +
     14A  LYS*     3.1    24.9    +      -       -      +
     15A  GLU*     3.0    29.6    +      -       +      +
----------------------------------------------------------
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Residues in contact with ILE 12 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
      8A  SER*     2.9    28.2    +      -       -      +
     11A  ASN*     1.3    77.2    -      -       +      +
     13A  GLN*     1.3    57.7    +      -       -      +
     15A  GLU*     3.2     9.2    +      -       +      +
     16A  ILE*     2.9    36.1    +      -       +      +
     26C  LEU*     4.3    26.7    -      -       +      +
     29C  SER*     6.0     4.5    -      -       -      -
     30C  LEU*     3.7    22.7    -      -       +      +
     33C  LEU*     4.2    23.6    -      -       +      -
----------------------------------------------------------
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Residues in contact with GLN 13 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
      9A  VAL*     3.0    19.1    +      -       +      +
     10A  VAL*     3.5     7.2    -      -       -      +
     12A  ILE*     1.3    77.0    -      -       -      +
     14A  LYS*     1.3    62.9    +      -       -      +
     16A  ILE*     3.2    13.5    +      -       -      +
     17A  ASP*     3.0    50.5    +      -       -      +
     27C  ASN*     3.8    14.0    +      -       -      +
     30C  LEU*     3.4    22.5    -      -       +      +
----------------------------------------------------------
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Residues in contact with LYS 14 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     10A  VAL*     3.0    28.2    +      -       +      +
     11A  ASN*     3.1    24.5    +      -       -      +
     13A  GLN*     1.3    75.4    -      -       -      +
     15A  GLU*     1.3    70.3    +      -       -      +
     17A  ASP*     3.3    12.7    +      -       -      +
     18A  ARG*     3.0    29.1    +      -       +      +
----------------------------------------------------------
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Residues in contact with GLU 15 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     11A  ASN*     3.0    18.3    +      -       +      +
     12A  ILE*     3.2     9.4    +      -       +      +
     14A  LYS*     1.3    87.1    +      -       -      +
     16A  ILE*     1.3    60.3    +      -       -      +
     18A  ARG*     3.2    26.4    +      -       -      +
     19A  LEU*     2.9    38.1    +      -       +      +
     26C  LEU*     5.5     5.2    -      -       +      -
----------------------------------------------------------
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Residues in contact with ILE 16 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     12A  ILE*     2.9    20.9    +      -       +      +
     13A  GLN*     3.2    24.2    +      -       -      +
     15A  GLU*     1.3    76.4    -      -       -      +
     17A  ASP*     1.3    62.0    +      -       -      +
     19A  LEU*     3.2     9.6    +      -       -      +
     20A  ASN*     3.0    36.2    +      -       -      +
     23C  ALA*     4.2    11.0    -      -       +      +
     26C  LEU*     3.7    40.2    -      -       +      +
     27C  ASN*     3.6    41.1    -      -       -      +
     30C  LEU*     4.1     7.6    -      -       +      -
----------------------------------------------------------
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Residues in contact with ASP 17 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     13A  GLN*     3.0    40.3    +      -       -      +
     14A  LYS*     3.5    12.1    -      -       -      +
     16A  ILE*     1.3    75.5    -      -       -      +
     18A  ARG*     1.3    62.3    +      -       -      +
     20A  ASN*     3.2    14.4    +      -       -      +
     21A  GLU*     3.0    22.3    +      -       -      +
----------------------------------------------------------
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Residues in contact with ARG 18 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     14A  LYS      3.0    16.9    +      -       -      +
     15A  GLU*     3.2    29.8    +      -       -      +
     17A  ASP*     1.3    75.6    -      -       +      +
     19A  LEU*     1.3    60.0    +      -       +      +
     21A  GLU*     3.2    23.5    +      -       -      +
     22A  VAL*     2.9    39.4    +      -       +      +
----------------------------------------------------------
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Residues in contact with LEU 19 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     15A  GLU*     2.9    21.2    +      -       +      +
     16A  ILE*     3.2     9.4    +      -       -      +
     18A  ARG*     1.3    77.5    -      -       +      +
     20A  ASN*     1.3    63.9    +      -       -      +
     22A  VAL*     3.2    12.5    +      -       +      +
     23A  ALA*     3.0    21.7    +      -       -      +
     19C  LEU*     4.1    29.8    -      -       +      +
     22C  VAL*     3.7    30.5    -      -       +      -
     23C  ALA*     4.7    11.7    -      -       +      +
     26C  LEU*     3.8    18.8    -      -       +      -
----------------------------------------------------------
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Residues in contact with ASN 20 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     16A  ILE*     3.0    33.7    +      -       -      +
     17A  ASP*     3.2    14.0    +      -       -      +
     19A  LEU*     1.3    74.3    -      -       -      +
     21A  GLU*     1.3    62.9    +      -       -      +
     23A  ALA*     3.2     9.5    +      -       -      +
     24A  LYS*     3.0    43.7    +      -       -      +
     20C  ASN*     4.9     7.8    -      -       -      +
     23C  ALA*     3.8    18.1    -      -       -      +
----------------------------------------------------------
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Residues in contact with GLU 21 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     17A  ASP      3.0    13.1    +      -       -      +
     18A  ARG*     3.5    24.4    +      -       -      +
     20A  ASN*     1.3    77.6    -      -       -      +
     22A  VAL*     1.3    62.3    +      -       +      +
     24A  LYS*     3.2    13.8    +      -       +      +
     25A  ASN*     3.0    41.5    +      -       -      +
----------------------------------------------------------
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Residues in contact with VAL 22 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     18A  ARG*     2.9    27.9    +      -       +      +
     19A  LEU*     3.2    15.2    +      -       +      +
     21A  GLU*     1.3    77.2    -      -       +      +
     23A  ALA*     1.3    57.8    +      -       -      +
     25A  ASN*     3.2     8.3    +      -       -      +
     26A  LEU*     2.9    40.3    +      -       +      +
     19C  LEU*     3.8    20.4    -      -       +      -
----------------------------------------------------------
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Residues in contact with ALA 23 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     19A  LEU      3.0    13.3    +      -       -      +
     20A  ASN*     3.2    12.5    +      -       -      +
     22A  VAL*     1.3    76.8    -      -       -      +
     24A  LYS*     1.3    64.0    +      -       +      +
     26A  LEU*     3.3     5.3    +      -       -      +
     27A  ASN*     3.0    22.9    +      -       -      +
     16C  ILE*     4.1    18.9    -      -       +      +
     19C  LEU*     4.3    19.7    -      -       +      +
     20C  ASN*     4.3    17.0    -      -       -      +
----------------------------------------------------------
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Residues in contact with LYS 24 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     20A  ASN*     3.0    35.6    +      -       -      +
     21A  GLU*     3.2    14.8    +      -       +      +
     23A  ALA*     1.3    77.0    -      -       +      +
     25A  ASN*     1.3    65.8    +      -       -      +
     27A  ASN*     3.2    10.0    +      -       -      +
     28A  GLU*     3.0    24.0    +      -       -      +
----------------------------------------------------------
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Residues in contact with ASN 25 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     21A  GLU*     3.0    37.4    +      -       -      +
     22A  VAL*     3.8     6.7    -      -       +      +
     24A  LYS*     1.3    79.9    -      -       -      +
     26A  LEU*     1.3    59.9    +      -       +      +
     28A  GLU*     3.2     9.3    +      -       -      +
     29A  SER*     3.0    31.2    +      -       -      -
----------------------------------------------------------
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Residues in contact with LEU 26 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     22A  VAL*     2.9    25.7    +      -       +      +
     23A  ALA      3.8     4.0    -      -       -      +
     24A  LYS      3.3     0.2    -      -       -      -
     25A  ASN*     1.3    77.0    -      -       +      +
     27A  ASN*     1.3    57.2    +      -       -      +
     29A  SER*     3.3    11.1    +      -       -      +
     30A  LEU*     2.9    30.0    +      -       -      +
     12C  ILE*     4.3    18.3    -      -       +      +
     15C  GLU*     5.5     5.2    -      -       +      -
     16C  ILE*     3.8    23.6    -      -       +      +
     19C  LEU*     3.8    29.4    -      -       +      -
----------------------------------------------------------
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Residues in contact with ASN 27 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     23A  ALA      3.0    14.4    +      -       -      +
     24A  LYS*     3.2    12.1    +      -       -      +
     26A  LEU*     1.3    76.2    -      -       -      +
     28A  GLU*     1.3    62.1    +      -       -      +
     30A  LEU*     3.2    12.1    +      -       -      +
     31A  ILE*     3.0    47.5    +      -       -      +
     13C  GLN*     5.3     2.3    -      -       -      +
     16C  ILE*     3.6    13.6    -      -       +      +
----------------------------------------------------------
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Residues in contact with GLU 28 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     24A  LYS      3.0    14.1    +      -       -      +
     25A  ASN*     3.2    11.9    +      -       -      +
     27A  ASN*     1.3    83.1    +      -       -      +
     29A  SER*     1.3    56.8    +      -       -      +
     31A  ILE*     3.2    16.3    +      -       +      +
     32A  ASP*     3.0    41.3    +      -       -      +
----------------------------------------------------------
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Residues in contact with SER 29 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     25A  ASN      3.0    14.4    +      -       -      -
     26A  LEU*     3.3    15.2    +      -       -      +
     28A  GLU*     1.3    76.9    -      -       -      +
     30A  LEU*     1.3    56.9    +      -       -      +
     32A  ASP*     3.3     9.8    +      -       -      +
     33A  LEU*     2.9    38.6    +      -       -      +
     12C  ILE*     6.0     4.0    -      -       -      -
----------------------------------------------------------
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Residues in contact with LEU 30 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     26A  LEU      2.9     9.8    +      -       -      +
     27A  ASN*     3.2    14.8    +      -       -      +
     29A  SER*     1.3    74.1    -      -       -      +
     31A  ILE*     1.3    65.7    +      -       +      +
     33A  LEU*     3.1     4.3    +      -       +      +
     34A  GLN*     3.0    39.8    +      -       -      +
      9C  VAL*     3.5    44.0    -      -       +      +
     12C  ILE*     3.8    26.8    -      -       +      +
     13C  GLN*     3.5    35.9    -      -       +      +
     16C  ILE*     4.1    14.6    -      -       +      -
----------------------------------------------------------
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Residues in contact with ILE 31 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     27A  ASN*     3.0    38.5    +      -       -      +
     28A  GLU*     3.2    16.8    +      -       +      +
     30A  LEU*     1.3    76.6    -      -       +      +
     32A  ASP*     1.3    67.4    +      -       -      +
     34A  GLN*     3.5    18.6    +      -       -      +
     35A  GLU*     3.2    35.8    -      -       -      +
----------------------------------------------------------
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Residues in contact with ASP 32 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     28A  GLU*     3.0    28.1    +      -       -      +
     29A  SER*     3.7    10.4    -      -       -      +
     30A  LEU      3.2     0.2    -      -       -      -
     31A  ILE*     1.3    84.3    -      -       -      +
     33A  LEU*     1.3    61.7    +      -       +      +
     35A  GLU*     3.4    27.7    +      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 33 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     29A  SER*     2.9    24.1    +      -       -      +
     30A  LEU*     3.1     6.9    +      -       +      +
     32A  ASP*     1.3    79.6    -      -       +      +
     34A  GLN*     1.3    61.6    +      -       -      +
     35A  GLU      3.3     6.6    +      -       -      +
      5C  ILE*     3.4    39.5    -      -       +      +
      8C  SER*     4.7     9.9    -      -       -      -
      9C  VAL*     4.1    17.7    -      -       +      -
     12C  ILE*     3.8    28.9    -      -       +      -
----------------------------------------------------------
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Residues in contact with GLN 34 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     30A  LEU*     3.0    30.6    +      -       -      +
     31A  ILE*     3.5    17.9    +      -       -      +
     32A  ASP      3.3     0.6    -      -       -      -
     33A  LEU*     1.3    77.5    -      -       -      +
     35A  GLU*     1.3    62.5    +      -       +      +
      5C  ILE*     5.4     0.2    -      -       -      -
      9C  VAL*     4.3    26.2    -      -       +      +
----------------------------------------------------------
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Residues in contact with GLU 35 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     31A  ILE*     3.2    36.7    +      -       -      +
     32A  ASP*     3.4    22.5    +      -       -      +
     33A  LEU      3.2     7.8    -      -       -      +
     34A  GLN*     1.3    84.9    -      -       +      +
      5C  ILE*     5.9     1.7    -      -       -      +
----------------------------------------------------------
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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