Contacts of the helix formed by residues 2 - 25 (chain L) in PDB entry 6C4Z


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 LYS 2 (chain L).
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
      1L  SER*     1.3    78.9    -      -       -      +
      3L  LEU*     1.3    64.9    +      -       -      +
      4L  LEU      3.2     1.6    -      -       -      -
      5L  GLU*     3.3    20.5    +      -       -      +
      6L  LEU*     3.1    17.7    +      -       -      +
     16N  LYS*     5.6     1.9    -      -       -      +
     19N  GLU*     6.3     3.6    -      -       +      -
     20N  LEU*     3.7    29.9    -      -       +      +
     23N  LYS*     4.0    41.2    -      -       +      +
----------------------------------------------------------
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Residues in contact with LEU 3 (chain L). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
      1K  SER      6.1     0.2    -      -       -      +
      3K  LEU*     3.9    28.3    -      -       +      -
      4K  LEU*     3.7    25.4    -      -       +      -
      7K  LEU*     4.0    27.6    -      -       +      -
      1L  SER      4.1     4.8    -      -       -      +
      2L  LYS*     1.3    78.3    -      -       -      +
      4L  LEU*     1.3    57.6    +      -       +      +
      6L  LEU*     3.4    12.9    +      -       +      -
      7L  LEU*     3.0    39.7    +      -       +      +
     21M  LEU*     4.6     3.1    -      -       +      -
     20N  LEU*     3.8    16.2    -      -       +      +
     24N  TRP*     4.4    17.3    -      -       +      -
----------------------------------------------------------
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Residues in contact with LEU 4 (chain L). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     24I  TRP*     4.1    11.4    -      -       +      -
     18J  ILE*     4.7     2.8    -      -       +      +
     21J  LEU*     3.7    20.0    -      -       +      +
     22J  GLU*     4.0    20.8    -      -       +      +
     25J  GLY*     3.6    38.8    -      -       -      +
     26J  NH2      4.1     2.0    -      -       -      +
      3K  LEU*     3.6    30.1    -      -       +      -
      1L  SER*     4.1    25.1    -      -       -      +
      2L  LYS      3.2     0.4    -      -       -      -
      3L  LEU*     1.3    76.4    -      -       +      +
      5L  GLU*     1.3    65.5    +      -       -      +
      7L  LEU*     3.4    13.4    +      -       +      +
      8L  ARG*     3.0    24.0    +      -       -      +
----------------------------------------------------------
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Residues in contact with GLU 5 (chain L). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
      1L  SER*     3.6    18.5    +      -       -      +
      2L  LYS*     3.3    23.3    +      -       -      +
      4L  LEU*     1.3    77.7    -      -       -      +
      6L  LEU*     1.3    61.1    +      -       -      +
      8L  ARG*     3.2    29.3    +      -       -      +
      9L  LYS*     3.2    24.8    +      -       -      +
     16N  LYS*     2.8    41.5    +      -       +      +
----------------------------------------------------------
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Residues in contact with LEU 6 (chain L). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
      7K  LEU*     4.2     9.2    -      -       +      -
      2L  LYS      3.1    10.1    +      -       -      +
      3L  LEU*     3.6    16.2    -      -       +      +
      4L  LEU      3.4     0.2    -      -       -      -
      5L  GLU*     1.3    77.6    -      -       -      +
      7L  LEU*     1.3    64.2    +      -       -      +
      9L  LYS*     3.3     5.1    +      -       -      +
     10L  LEU*     3.1    40.5    +      -       +      +
     14M  LEU*     5.1     2.7    -      -       +      -
     18M  ILE*     5.4     2.2    -      -       +      -
     21M  LEU*     3.4    33.2    -      -       +      -
     13N  ALA*     3.7    26.9    -      -       +      +
     16N  LYS*     4.6    13.1    -      -       +      +
     17N  ALA*     4.2    13.9    -      -       +      +
     20N  LEU*     3.8    12.8    -      -       +      -
----------------------------------------------------------
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Residues in contact with LEU 7 (chain L). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     18J  ILE*     3.8    16.7    -      -       +      +
     21J  LEU*     5.7     3.6    -      -       +      -
      3K  LEU*     4.3    22.0    -      -       +      -
      6K  LEU*     4.0    16.2    -      -       +      -
      7K  LEU*     3.7    35.7    -      -       +      +
     10K  LEU*     3.5    29.2    -      -       +      +
      3L  LEU*     3.0    25.5    +      -       +      +
      4L  LEU*     3.7    24.7    -      -       +      +
      6L  LEU*     1.3    75.0    -      -       -      +
      8L  ARG*     1.3    62.9    +      -       -      +
     10L  LEU*     3.1     6.5    +      -       -      +
     11L  GLY*     2.9    21.5    +      -       -      -
----------------------------------------------------------
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Residues in contact with ARG 8 (chain L). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     15J  HIS*     4.6     7.3    +      -       +      +
     18J  ILE*     3.5    15.4    -      -       +      +
     19J  GLU*     4.7    20.6    +      -       +      +
     22J  GLU*     3.2    32.0    -      -       +      +
     23J  LYS      5.2     0.4    -      -       -      +
      4L  LEU      3.0    12.9    +      -       -      +
      5L  GLU*     3.4    34.4    +      -       -      +
      7L  LEU*     1.3    74.6    -      -       -      +
      9L  LYS*     1.3    60.2    +      -       +      +
     11L  GLY*     3.2     2.8    +      -       -      -
     12L  GLU*     2.9    49.9    +      -       +      +
----------------------------------------------------------
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Residues in contact with LYS 9 (chain L). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
      5L  GLU      3.2    12.2    +      -       -      +
      6L  LEU      3.7     7.4    -      -       -      +
      8L  ARG*     1.3    78.5    -      -       +      +
     10L  LEU*     1.3    55.3    +      -       -      +
     12L  GLU*     3.0    30.8    +      -       -      +
     13L  ALA*     2.8    35.8    +      -       -      +
      9N  LYS*     4.2    10.7    -      -       +      +
     12N  GLU*     3.4    38.8    +      -       +      +
     13N  ALA*     3.9    22.0    -      -       +      +
     16N  LYS*     3.5    32.7    -      -       +      +
----------------------------------------------------------
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Residues in contact with LEU 10 (chain L). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
      7K  LEU*     3.3    34.5    -      -       +      -
     10K  LEU*     4.2    22.3    -      -       +      +
     11K  GLY*     5.0     3.4    -      -       -      +
     14K  LEU*     3.7    16.7    -      -       +      +
      6L  LEU*     3.1    33.0    +      -       +      +
      7L  LEU*     3.5     9.2    -      -       -      +
      9L  LYS*     1.3    74.5    -      -       -      +
     11L  GLY*     1.3    56.9    +      -       -      +
     13L  ALA*     3.4     4.4    +      -       +      +
     14L  LEU*     2.9    31.2    +      -       -      +
     14M  LEU*     3.6    37.2    -      -       +      -
     18M  ILE*     4.1     8.7    -      -       +      -
     13N  ALA*     4.3     4.9    -      -       +      -
----------------------------------------------------------
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Residues in contact with GLY 11 (chain L). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     11J  GLY      5.1     1.0    -      -       -      +
     14J  LEU*     5.7     1.6    -      -       -      -
     15J  HIS*     4.3    15.9    +      -       -      +
     18J  ILE*     4.2    18.5    -      -       -      +
     10K  LEU*     4.8     4.9    -      -       -      +
      7L  LEU      2.9    13.4    +      -       -      -
      8L  ARG      3.6     4.9    -      -       -      -
     10L  LEU*     1.3    76.2    -      -       -      +
     12L  GLU*     1.3    55.0    +      -       -      +
     14L  LEU*     3.5     6.6    +      -       -      +
     15L  HIS*     3.0    28.9    +      -       -      +
----------------------------------------------------------
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Residues in contact with GLU 12 (chain L). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     15J  HIS*     3.4    27.2    -      -       +      -
     19J  GLU*     5.2     0.7    -      -       -      +
      8L  ARG*     2.9    31.2    +      -       -      +
      9L  LYS*     3.0    27.7    +      -       -      +
     11L  GLY*     1.3    72.4    -      -       -      +
     13L  ALA*     1.3    59.9    +      -       -      +
     15L  HIS*     3.4     6.5    +      -       -      +
     16L  LYS*     3.0    39.4    +      -       -      +
      9N  LYS*     2.7    43.7    +      -       +      +
----------------------------------------------------------
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Residues in contact with ALA 13 (chain L). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     14K  LEU*     4.2    18.6    -      -       +      -
      9L  LYS      2.8    18.6    +      -       -      +
     10L  LEU*     3.7     6.5    -      -       +      +
     12L  GLU*     1.3    69.7    -      -       -      +
     14L  LEU*     1.3    61.1    +      -       -      +
     16L  LYS*     3.3     6.3    +      -       -      +
     17L  ALA*     2.9    29.1    +      -       -      +
      6N  LEU*     3.6     8.1    -      -       +      +
      9N  LYS*     4.0    22.8    -      -       +      +
     10N  LEU*     4.3    17.3    -      -       +      +
     13N  ALA*     5.7     0.9    -      -       +      -
----------------------------------------------------------
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Residues in contact with LEU 14 (chain L). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
      6I  LEU*     4.9     2.7    -      -       +      -
     10I  LEU*     3.7    23.1    -      -       +      -
     11J  GLY*     5.7     1.8    -      -       -      -
     14J  LEU*     3.7    20.6    -      -       +      -
     10K  LEU*     4.2    13.9    -      -       +      +
     13K  ALA*     4.1    17.7    -      -       +      +
     14K  LEU*     4.0    34.7    -      -       +      +
     17K  ALA*     4.7     8.7    -      -       +      -
     10L  LEU      2.9    17.1    +      -       -      +
     11L  GLY*     3.7     5.2    -      -       -      +
     13L  ALA*     1.3    74.9    -      -       -      +
     15L  HIS*     1.3    62.8    +      -       -      +
     17L  ALA*     3.3     3.3    +      -       -      +
     18L  ILE*     3.0    47.9    +      -       +      +
----------------------------------------------------------
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Residues in contact with HIS 15 (chain L). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
      8J  ARG*     4.5     7.1    +      -       +      +
     11J  GLY*     4.2    10.8    -      -       -      +
     12J  GLU*     3.5    45.2    +      -       +      +
     15J  HIS*     4.9    16.7    -      +       +      -
     11L  GLY      3.0    19.7    +      -       -      +
     12L  GLU*     3.5     7.9    -      -       -      +
     14L  LEU*     1.3    76.9    -      -       -      +
     16L  LYS*     1.3    74.0    +      -       +      +
     18L  ILE*     3.3    10.5    +      -       -      +
     19L  GLU*     3.1    57.5    +      -       +      +
----------------------------------------------------------
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Residues in contact with LYS 16 (chain L). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     12L  GLU*     3.0    23.6    +      -       -      +
     13L  ALA*     3.5     9.0    -      -       -      +
     15L  HIS*     1.3    84.8    -      -       +      +
     17L  ALA*     1.3    63.6    +      -       -      +
     19L  GLU*     3.3    20.4    +      -       -      +
     20L  LEU*     3.1    25.3    +      -       -      +
      2N  LYS*     4.9     2.9    -      -       +      +
      5N  GLU*     3.3    39.1    +      -       +      +
      6N  LEU*     4.2    23.1    -      -       +      +
      8N  ARG*     5.2     3.0    -      -       -      +
      9N  LYS*     3.8    35.8    -      -       +      +
----------------------------------------------------------
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Residues in contact with ALA 17 (chain L). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     14K  LEU*     4.6     6.5    -      -       +      -
     17K  ALA*     4.0    17.9    -      -       +      -
     18K  ILE*     5.5     1.6    -      -       +      -
     21K  LEU*     4.0    22.2    -      -       +      +
     13L  ALA      2.9    14.6    +      -       -      +
     14L  LEU*     3.3    11.9    +      -       -      +
     16L  LYS*     1.3    75.6    -      -       -      +
     18L  ILE*     1.3    58.2    +      -       -      +
     20L  LEU*     3.4     5.4    +      -       -      +
     21L  LEU*     3.0    32.2    +      -       -      +
      6N  LEU*     4.3    12.3    -      -       +      +
----------------------------------------------------------
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Residues in contact with ILE 18 (chain L). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
      6I  LEU*     5.1     6.5    -      -       +      -
     10I  LEU*     3.9    35.9    -      -       +      -
      4J  LEU*     4.6     3.6    -      -       +      +
      7J  LEU*     3.9    13.2    -      -       +      +
      8J  ARG*     3.5    36.1    -      -       +      +
     11J  GLY*     4.2    16.8    -      -       -      +
     17K  ALA*     5.4     0.7    -      -       +      -
     14L  LEU*     3.0    31.8    +      -       +      +
     15L  HIS*     3.7     5.4    -      -       -      +
     16L  LYS      3.3     0.4    -      -       -      -
     17L  ALA*     1.3    73.2    -      -       +      +
     19L  GLU*     1.3    65.8    +      -       +      +
     21L  LEU*     3.2    17.6    +      -       +      +
     22L  GLU*     2.9    22.7    +      -       +      +
----------------------------------------------------------
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Residues in contact with GLU 19 (chain L). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
      8J  ARG*     4.7    16.4    -      -       +      +
     12J  GLU*     5.4     0.3    -      -       -      +
     15L  HIS*     3.1    47.6    +      -       +      +
     16L  LYS*     3.3    25.4    +      -       -      +
     18L  ILE*     1.3    76.5    -      -       -      +
     20L  LEU*     1.3    61.2    +      -       -      +
     22L  GLU*     3.2    12.0    -      -       -      +
     23L  LYS*     3.1    21.7    +      -       -      +
      2N  LYS*     6.2     2.5    -      -       +      -
      5N  GLU*     5.3     1.6    -      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 20 (chain L). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     21K  LEU*     3.7    17.3    -      -       +      -
     16L  LYS      3.1    10.7    +      -       -      +
     17L  ALA      3.5     8.3    -      -       -      +
     18L  ILE      3.3     0.2    -      -       -      -
     19L  GLU*     1.3    73.8    -      -       -      +
     21L  LEU*     1.3    65.6    +      -       -      +
     23L  LYS*     3.0     9.9    +      -       +      +
     24L  TRP*     2.9    58.8    +      -       +      +
      2N  LYS*     3.5    31.1    -      -       +      +
      3N  LEU*     3.6    34.5    -      -       +      +
      6N  LEU*     3.6    25.6    -      -       +      -
----------------------------------------------------------
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Residues in contact with LEU 21 (chain L). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
      6I  LEU*     4.0    26.5    -      -       +      -
      4J  LEU*     4.1    13.6    -      -       +      +
      7J  LEU*     5.6     2.0    -      -       +      -
     17K  ALA*     4.1    16.4    -      -       +      -
     20K  LEU*     3.6    35.2    -      -       +      -
     21K  LEU*     3.7    27.5    -      -       +      +
     24K  TRP*     3.4    21.6    -      -       +      -
     17L  ALA      3.0    18.7    +      -       -      +
     18L  ILE*     3.4    16.4    -      -       +      +
     20L  LEU*     1.3    74.2    -      -       -      +
     22L  GLU*     1.3    56.7    +      -       -      +
     24L  TRP*     4.8     1.3    -      -       -      +
     25L  GLY*     2.8    29.6    +      -       -      -
----------------------------------------------------------
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Residues in contact with GLU 22 (chain L). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
      1J  SER      4.9     2.1    -      -       -      +
      4J  LEU*     3.6    39.9    -      -       +      +
      5J  GLU*     4.1     8.1    +      -       -      +
      8J  ARG*     2.3    54.0    +      -       +      +
     18L  ILE*     2.9    14.2    +      -       +      +
     19L  GLU*     3.2    12.7    -      -       -      +
     20L  LEU      3.1     0.2    -      -       -      -
     21L  LEU*     1.3    73.9    -      -       -      +
     23L  LYS*     1.3    66.5    +      -       -      +
     25L  GLY*     2.9    24.4    +      -       -      +
----------------------------------------------------------
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Residues in contact with LYS 23 (chain L). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     19L  GLU      3.1     7.9    +      -       -      +
     20L  LEU*     3.0    13.4    +      -       +      +
     22L  GLU*     1.3    78.6    -      -       -      +
     24L  TRP*     1.3    71.0    +      -       +      +
     25L  GLY      3.8     3.8    -      -       -      +
----------------------------------------------------------
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Residues in contact with TRP 24 (chain L). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     21K  LEU*     3.6    31.6    -      -       +      -
     24K  TRP*     4.6    16.4    -      -       +      -
     25K  GLY*     3.5    34.1    -      -       -      -
     20L  LEU*     2.9    42.1    +      -       +      +
     21L  LEU*     4.3     1.8    -      -       -      +
     23L  LYS*     1.3    87.1    -      -       +      +
     25L  GLY*     1.3    61.4    +      -       -      +
     26L  NH2      3.9     0.9    +      -       -      -
      4M  LEU*     4.0    20.9    -      -       +      -
      3N  LEU*     4.4    18.6    -      -       +      -
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Residues in contact with GLY 25 (chain L). Click here for Legend to table.
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                                  Specific contacts
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     Residue       Dist    Surf   HB    Arom    Phob    DC
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      1J  SER*     6.3     0.2    -      -       -      -
      4J  LEU*     4.1    11.9    -      -       -      +
     24K  TRP*     3.4    21.9    -      -       -      -
     21L  LEU      2.8    23.8    +      -       -      -
     22L  GLU      2.9    12.8    +      -       -      +
     23L  LYS      3.8     4.0    -      -       -      +
     24L  TRP*     1.3    75.3    -      -       -      +
     26L  NH2      1.3    47.5    +      -       -      -
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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
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  Atomic class           I  II  III   IV   V   VI  VII  VIII
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   I  (Hydrophilic)      +   +    +    -   +   +    +    +
  II  (Acceptor)         +   -    +    -   +   +    +    -
 III  (Donor)            +   +    -    -   +   +    -    +
  IV  (Hydrophobic)      -   -    -    +   +   +    +    +
   V  (Aromatic)         +   +    +    +   +   +    +    +
  VI  (Neutral)          +   +    +    +   +   +    +    +
 VII  (Neutral-donor)    +   +    -    +   +   +    -    +
VIII  (Neutral-acceptor) +   -    +    +   +   +    +    -
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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