Contacts of the helix formed by residues 81 - 111 (chain C) in PDB entry 1M7L


Residue contacts within the protein are derived with the CSU software (Sobolev V., Sorokine A., Prilusky J., Abola E.E. and Edelman M. (1999) Automated analysis of interatomic contacts in proteins. Bioinformatics, 15, 327-332). A short description of the analytical approach is given at the end of the page.
For CSU analysis of other PDB entry

Note:
Non-standard 3 letter residue codes indicate a heterogroup. To identify and analyse, use LPC software

Legend:
Dist - nearest distance (Å) between atoms of two residues
Surf - contact surface area (Å2) between two residues
HB   - hydrophilic-hydrophilic contact (hydrogen bond)
Arom - aromatic-aromatic contact
Phob - hydrophobic-hydrophobic contact
DC   - hydrophobic-hydrophilic contact (destabilizing contact)
+/-  - indicates presence/absence of a specific contacts
*    - indicates residues forming contacts  by their side chain
       (including CA atoms)
Residues in contact with GLY 81 (chain C).
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     82C  LEU*     1.3    66.6    +      -       -      -
     83C  PRO*     3.5     5.8    -      -       -      -
     84C  ASP*     3.4    19.0    +      -       -      +
     85C  VAL*     3.1    24.7    +      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 82 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     81C  GLY*     1.3    67.7    -      -       -      -
     83C  PRO*     1.4    68.9    -      -       +      +
     85C  VAL*     2.8    41.2    +      -       +      +
     86C  ALA*     3.3     4.3    +      -       -      +
----------------------------------------------------------
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Residues in contact with PRO 83 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     81C  GLY*     3.7     4.0    -      -       -      -
     82C  LEU*     1.4    95.5    -      -       +      +
     84C  ASP*     1.3    53.1    +      -       -      +
     86C  ALA*     3.2     9.6    +      -       +      +
     87C  SER*     2.6    36.1    +      -       -      +
----------------------------------------------------------
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Residues in contact with ASP 84 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     81C  GLY      3.4    21.4    +      -       -      +
     82C  LEU      3.2     0.8    -      -       -      -
     83C  PRO*     1.3    76.2    -      -       -      +
     85C  VAL*     1.3    66.7    +      -       -      +
     87C  SER*     3.3    13.1    -      -       -      -
     88C  LEU*     2.9    25.3    +      -       -      +
----------------------------------------------------------
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Residues in contact with VAL 85 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
      9A  ARG*     5.8     0.2    -      -       -      +
     81C  GLY      3.1    18.2    -      -       -      +
     82C  LEU*     2.8    22.9    +      -       +      +
     84C  ASP*     1.3    81.6    -      -       +      +
     86C  ALA*     1.3    58.2    +      -       -      +
     88C  LEU*     3.1     4.2    +      -       -      -
     89C  ARG*     2.7    57.5    +      -       -      +
----------------------------------------------------------
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Residues in contact with ALA 86 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     82C  LEU      3.3     3.5    +      -       -      +
     83C  PRO*     3.2     9.3    +      -       +      +
     85C  VAL*     1.3    80.9    -      -       +      +
     87C  SER*     1.3    56.8    +      -       -      +
     89C  ARG*     3.0    34.3    +      -       +      +
     90C  GLN*     3.5     6.8    +      -       -      +
----------------------------------------------------------
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Residues in contact with SER 87 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     83C  PRO*     2.6    26.0    +      -       -      +
     84C  ASP*     3.0    20.0    +      -       -      -
     86C  ALA*     1.3    72.4    -      -       -      +
     88C  LEU*     1.3    62.9    +      -       -      +
     89C  ARG      3.1     1.8    -      -       -      -
     90C  GLN*     2.8    41.0    +      -       -      +
     91C  GLN*     3.1    10.6    +      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 88 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
      9A  ARG*     4.0    31.0    -      -       +      +
     12A  VAL*     4.7    13.5    -      -       +      -
     84C  ASP*     2.9    13.1    +      -       -      +
     85C  VAL*     3.1    12.5    +      -       -      +
     87C  SER*     1.3    78.4    -      -       -      +
     89C  ARG*     1.3    74.8    +      -       -      +
     91C  GLN*     3.4    33.2    +      -       +      +
     92C  VAL*     2.9    43.5    +      -       +      +
----------------------------------------------------------
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Residues in contact with ARG 89 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
      9A  ARG*     3.6    25.1    -      -       -      +
     45B  VAL*     5.9     0.2    -      -       -      +
     48B  LEU*     4.0    26.3    -      -       +      +
     49B  ARG*     3.7    16.1    -      -       -      +
     85C  VAL*     2.7    52.5    +      -       -      +
     86C  ALA*     3.0    18.7    +      -       +      +
     88C  LEU*     1.3   105.2    -      -       -      +
     90C  GLN*     1.3    57.7    +      -       -      +
     91C  GLN      3.2     0.2    -      -       -      -
     92C  VAL*     2.9    30.4    -      -       +      +
     93C  GLU*     3.0    16.7    +      -       -      +
----------------------------------------------------------
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Residues in contact with GLN 90 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     86C  ALA      3.5     3.0    +      -       -      +
     87C  SER*     2.8    43.4    +      -       -      +
     89C  ARG*     1.3    75.6    -      -       -      +
     91C  GLN*     1.3    60.9    +      -       -      +
     93C  GLU*     3.1    22.2    +      -       -      +
     94C  ALA*     3.0    24.8    +      -       -      +
----------------------------------------------------------
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Residues in contact with GLN 91 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     12A  VAL*     5.4     2.2    -      -       -      +
     13A  GLU*     6.1     0.2    -      -       -      +
     16A  GLN*     3.9    24.2    +      -       -      +
     87C  SER      3.1    13.9    +      -       -      +
     88C  LEU*     3.5    32.1    -      -       -      +
     89C  ARG      3.2     0.2    -      -       -      -
     90C  GLN*     1.3    78.7    -      -       -      +
     92C  VAL*     1.3    56.7    +      -       -      +
     94C  ALA*     3.1    13.0    -      -       +      +
     95C  LEU*     3.1    22.9    +      -       -      +
----------------------------------------------------------
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Residues in contact with VAL 92 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     12A  VAL*     5.0    17.9    -      -       +      -
     48B  LEU*     4.8    20.0    -      -       +      -
     51B  GLN*     5.8     0.9    -      -       -      +
     52B  VAL*     5.2    13.2    -      -       +      -
     55B  LEU*     4.1     8.2    -      -       +      +
     88C  LEU*     2.9    38.2    +      -       +      +
     89C  ARG*     2.9    29.3    +      -       +      +
     91C  GLN*     1.3    74.0    -      -       -      +
     93C  GLU*     1.3    64.0    +      -       +      +
     94C  ALA      3.1     1.3    -      -       -      -
     95C  LEU*     3.2    14.1    +      -       +      +
     96C  GLN*     3.0    31.7    +      -       -      +
----------------------------------------------------------
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Residues in contact with GLU 93 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     89C  ARG*     3.0    17.2    +      -       -      +
     90C  GLN*     3.1    28.4    +      -       -      +
     92C  VAL*     1.3    78.3    -      -       +      +
     94C  ALA*     1.3    58.0    +      -       -      +
     96C  GLN*     2.9    39.0    +      -       -      +
     97C  GLY*     3.0    12.1    +      -       -      -
    100C  GLN*     5.0     0.5    +      -       -      -
----------------------------------------------------------
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Residues in contact with ALA 94 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     90C  GLN      3.0    11.7    +      -       -      +
     91C  GLN*     3.1    17.7    -      -       +      +
     93C  GLU*     1.3    76.4    -      -       -      +
     95C  LEU*     1.3    60.1    +      -       -      +
     97C  GLY*     3.0    15.7    +      -       -      +
     98C  GLN*     3.0    21.7    +      -       +      +
----------------------------------------------------------
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Residues in contact with LEU 95 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     12A  VAL*     4.2    13.5    -      -       +      +
     15A  LEU*     3.9    33.0    -      -       +      +
     16A  GLN*     3.5    26.7    -      -       +      +
     19A  VAL*     3.4    34.1    -      -       +      -
     55B  LEU*     3.9    11.9    -      -       +      -
     91C  GLN      3.1     9.2    +      -       -      +
     92C  VAL*     3.2    15.2    +      -       +      +
     94C  ALA*     1.3    80.3    -      -       -      +
     96C  GLN*     1.3    60.1    +      -       -      +
     98C  GLN*     3.3     8.9    +      -       +      +
     99C  VAL*     3.3    20.6    +      -       -      +
----------------------------------------------------------
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Residues in contact with GLN 96 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     51B  GLN*     4.0    22.1    +      -       -      +
     55B  LEU*     3.5    21.0    -      -       +      +
     92C  VAL*     3.0    13.4    +      -       -      +
     93C  GLU*     2.9    49.8    -      -       -      +
     95C  LEU*     1.3    74.5    -      -       -      +
     97C  GLY*     1.3    59.6    +      -       -      +
     99C  VAL*     3.1    11.8    -      -       +      +
    100C  GLN*     3.0    37.3    +      -       -      +
----------------------------------------------------------
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Residues in contact with GLY 97 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     93C  GLU      3.0    13.4    +      -       -      -
     94C  ALA*     3.0     7.0    +      -       -      -
     96C  GLN*     1.3    80.1    -      -       -      +
     98C  GLN*     1.3    56.9    +      -       -      +
    100C  GLN*     3.0    33.5    -      -       -      +
    101C  HIS*     2.9    17.7    +      -       -      +
----------------------------------------------------------
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Residues in contact with GLN 98 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     19A  VAL*     4.1    18.2    -      -       +      -
     23A  GLN*     5.2     6.9    -      -       -      +
     94C  ALA*     3.0    17.9    +      -       -      +
     95C  LEU*     3.5    12.6    -      -       +      +
     97C  GLY*     1.3    77.6    -      -       -      +
     99C  VAL*     1.3    58.6    +      -       -      +
    101C  HIS*     2.7    48.0    +      -       -      -
    102C  LEU*     3.0    21.2    +      -       +      +
----------------------------------------------------------
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Residues in contact with VAL 99 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     19A  VAL*     4.2    10.5    -      -       +      +
     55B  LEU*     3.4    29.4    -      -       +      -
     58B  GLN*     4.2    22.0    -      -       +      -
     59B  VAL*     4.2    21.1    -      -       +      +
     62B  LEU*     4.0    17.9    -      -       +      +
     95C  LEU      3.3     4.8    +      -       -      +
     96C  GLN*     3.1    17.9    -      -       +      +
     98C  GLN*     1.3    81.0    -      -       -      +
    100C  GLN*     1.3    59.3    +      -       +      +
    102C  LEU*     3.8     6.1    -      -       +      +
    103C  GLN*     3.0    27.4    +      -       -      +
----------------------------------------------------------
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Residues in contact with GLN 100 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     93C  GLU      5.0     0.6    +      -       -      -
     96C  GLN*     3.0    22.4    +      -       -      +
     97C  GLY*     3.0    38.1    -      -       -      +
     99C  VAL*     1.3    80.1    -      -       +      +
    101C  HIS*     1.3    58.8    +      -       +      +
    103C  GLN*     3.4     7.7    +      -       -      +
    104C  ALA*     3.0    23.4    +      -       -      +
----------------------------------------------------------
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Residues in contact with HIS 101 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     23A  GLN*     5.3     2.6    -      -       -      +
     97C  GLY      2.9    15.8    +      -       -      +
     98C  GLN*     2.7    56.6    +      -       -      -
    100C  GLN*     1.3    80.9    -      -       +      +
    102C  LEU*     1.3    75.3    +      -       +      +
    103C  GLN      3.3     0.2    -      -       -      -
    104C  ALA*     3.0    12.3    -      -       +      +
    105C  ALA*     3.0    26.6    +      -       +      +
----------------------------------------------------------
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Residues in contact with LEU 102 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     19A  VAL*     4.0    20.9    -      -       +      +
     22A  LEU*     4.6     4.7    -      -       +      -
     23A  GLN*     3.7    46.2    -      -       +      +
     26A  PHE*     3.2    30.2    -      -       +      -
     62B  LEU*     4.6     7.4    -      -       +      -
     98C  GLN*     3.0    14.7    +      -       +      +
     99C  VAL*     3.8     6.5    -      -       -      +
    100C  GLN      3.2     0.2    -      -       -      -
    101C  HIS*     1.3   113.6    -      -       +      +
    103C  GLN*     1.3    61.1    +      -       -      +
    104C  ALA      3.2     0.2    -      -       -      -
    105C  ALA*     4.8     1.8    -      -       +      -
    106C  PHE*     2.9    27.9    +      -       -      +
----------------------------------------------------------
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Residues in contact with GLN 103 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     58B  GLN*     5.2     8.1    -      -       -      +
     61B  HIS*     5.3     1.8    -      -       -      +
     62B  LEU*     3.7    30.9    -      -       +      +
     99C  VAL      3.0    17.3    +      -       -      +
    100C  GLN*     3.6     7.6    -      -       -      +
    102C  LEU*     1.3    74.5    -      -       -      +
    104C  ALA*     1.3    60.3    +      -       -      +
    106C  PHE*     3.3     7.4    -      -       -      +
    107C  SER*     2.9    21.9    +      -       -      -
    110C  LYS*     2.8    34.7    +      -       -      +
----------------------------------------------------------
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Residues in contact with ALA 104 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    100C  GLN      3.0    14.8    +      -       -      +
    101C  HIS*     3.0    19.3    -      -       +      +
    103C  GLN*     1.3    75.5    -      -       -      +
    105C  ALA*     1.3    63.5    +      -       -      +
    107C  SER*     3.0    22.6    +      -       -      -
    108C  GLN*     4.1     4.3    +      -       -      +
----------------------------------------------------------
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Residues in contact with ALA 105 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     26A  PHE*     4.4     7.0    -      -       +      -
     30A  LYS*     6.2     3.6    -      -       +      -
    101C  HIS*     3.0    12.1    +      -       +      +
    102C  LEU*     4.1     4.9    -      -       +      +
    104C  ALA*     1.3    79.3    -      -       -      +
    106C  PHE*     1.3    62.3    +      -       -      +
    108C  GLN*     3.0    18.8    +      -       -      +
    109C  TYR*     2.9    36.3    -      -       +      +
----------------------------------------------------------
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Residues in contact with PHE 106 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     26A  PHE*     3.5    22.4    -      +       -      -
     62B  LEU*     3.2    49.8    -      -       +      -
     65B  ALA*     4.5     3.8    -      -       +      -
     66B  PHE*     3.5    40.4    -      +       -      -
     69B  TYR*     3.3    37.9    -      +       +      -
    102C  LEU*     2.9    19.1    +      -       +      +
    103C  GLN*     3.3    13.2    -      -       -      +
    104C  ALA      3.2     0.2    -      -       -      -
    105C  ALA*     1.3    77.3    -      -       -      +
    107C  SER*     1.3    52.0    +      -       -      +
    109C  TYR*     3.6     7.2    -      -       +      -
    110C  LYS*     2.5    45.2    +      -       +      +
----------------------------------------------------------
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Residues in contact with SER 107 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    103C  GLN*     2.9    13.9    +      -       -      -
    104C  ALA*     3.0    17.0    +      -       -      -
    106C  PHE*     1.3    75.9    -      -       -      +
    108C  GLN*     1.3    62.3    +      -       -      +
    110C  LYS*     3.4    31.0    +      -       -      +
    111C  LYS*     3.6    12.3    -      -       -      +
----------------------------------------------------------
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Residues in contact with GLN 108 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     33A  GLU*     3.2    31.0    +      -       -      +
    104C  ALA      4.7     5.2    -      -       -      +
    105C  ALA*     3.0    14.8    +      -       -      +
    107C  SER*     1.3    76.1    -      -       -      +
    109C  TYR*     1.3    69.0    +      -       +      +
    110C  LYS      3.1     5.1    +      -       -      -
    111C  LYS*     3.2    43.1    +      -       -      +
    112C  VAL*     3.3     1.6    -      -       -      +
----------------------------------------------------------
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Residues in contact with TYR 109 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     26A  PHE*     3.2    28.9    -      +       +      -
     29A  TYR*     3.3    17.3    -      -       +      +
     30A  LYS*     2.8    46.1    +      -       +      +
     32A  VAL*     5.0     0.7    -      -       +      -
     33A  GLU*     4.0    26.9    -      -       +      -
     69B  TYR*     3.3    17.6    -      -       +      +
    105C  ALA*     2.9    42.6    -      -       +      +
    106C  PHE*     3.1    14.3    +      -       +      +
    108C  GLN*     1.3    79.4    -      -       +      +
    110C  LYS*     1.3    60.7    +      -       -      +
    111C  LYS      3.3     0.7    -      -       -      -
    112C  VAL*     3.0    27.2    +      -       +      +
----------------------------------------------------------
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Residues in contact with LYS 110 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     65B  ALA*     6.2     3.4    -      -       +      -
     69B  TYR*     2.8    45.8    +      -       +      +
    103C  GLN*     2.8    36.0    +      -       -      +
    106C  PHE*     2.5    28.3    +      -       +      +
    107C  SER*     3.4    24.5    +      -       -      +
    108C  GLN      3.1     0.4    -      -       -      -
    109C  TYR*     1.3    74.9    -      -       -      +
    111C  LYS*     1.3    57.7    +      -       +      +
    112C  VAL      3.2     1.1    +      -       -      -
    113C  GLU      4.3     3.8    +      -       -      +
    114C  LEU*     5.0     0.5    -      -       -      +
----------------------------------------------------------
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Residues in contact with LYS 111 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     33A  GLU*     2.6    29.3    +      -       -      +
    107C  SER      3.6    10.5    -      -       -      +
    108C  GLN*     3.2    35.7    -      -       -      +
    109C  TYR      3.3     0.2    -      -       -      -
    110C  LYS*     1.3    77.0    -      -       +      +
    112C  VAL*     1.3    57.6    -      -       -      +
    114C  LEU*     3.2    34.8    -      -       +      +
    115C  PHE*     4.6     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