Contacts of the helix formed by residues 79 - 107 (chain B) in PDB entry 1YWT


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 PRO 79 (chain B).
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     80B  GLU*     1.3    95.4    +      -       +      +
     81B  VAL*     3.5     7.7    -      -       -      -
     82B  ARG*     3.7    10.8    +      -       +      +
     83B  GLU*     3.1    36.1    +      -       -      +
----------------------------------------------------------
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Residues in contact with GLU 80 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
      4A  ALA      5.0     0.5    -      -       -      -
      5A  SER*     3.0    47.8    +      -       -      +
      8A  GLN*     4.3    19.3    -      -       +      +
      9A  LYS*     3.9    26.3    -      -       +      +
     12A  LEU*     4.1     9.0    -      -       +      -
     79B  PRO*     1.3   101.3    -      -       +      +
     81B  VAL*     1.3    68.2    +      -       -      +
     83B  GLU*     3.4     4.7    +      -       -      +
     84B  TYR*     2.9    27.0    +      -       -      +
----------------------------------------------------------
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Residues in contact with VAL 81 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
      8A  GLN*     5.2     3.8    -      -       -      +
     12A  LEU*     3.7    22.2    -      -       +      -
     62B  LEU*     3.8    16.3    -      -       +      +
     65B  ILE*     4.0    19.1    -      -       +      +
     66B  GLU*     3.7    39.7    -      -       +      +
     79B  PRO      3.5     5.6    -      -       -      -
     80B  GLU*     1.3    78.6    -      -       +      +
     82B  ARG*     1.3    60.0    +      -       -      +
     84B  TYR*     3.7     1.4    -      -       -      +
     85B  ARG*     2.8    31.3    +      -       +      +
----------------------------------------------------------
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Residues in contact with ARG 82 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     66B  GLU*     3.2    28.2    +      -       -      +
     79B  PRO*     3.7    10.4    +      -       +      +
     80B  GLU      3.3     0.4    -      -       -      -
     81B  VAL*     1.3    79.7    -      -       -      +
     83B  GLU*     1.3    67.4    +      -       -      +
     85B  ARG*     3.1    18.1    +      -       -      +
     86B  GLU*     2.9    51.0    +      -       -      +
----------------------------------------------------------
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Residues in contact with GLU 83 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
      1A  MET*     5.0     3.1    -      -       -      +
      5A  SER*     6.1     0.2    -      -       -      -
      9A  LYS*     3.0    33.5    +      -       -      +
     79B  PRO*     3.1    22.7    +      -       -      +
     80B  GLU*     3.4     6.6    +      -       -      +
     82B  ARG*     1.3    79.2    -      -       +      +
     84B  TYR*     1.3    61.4    +      -       -      +
     86B  GLU*     3.6    14.3    +      -       -      +
     87B  LYS*     3.2    19.6    +      -       -      +
----------------------------------------------------------
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Residues in contact with TYR 84 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
      9A  LYS*     4.6    14.5    -      -       +      +
     12A  LEU*     4.2    10.1    -      -       +      -
     13A  ALA*     3.7    24.4    -      -       +      +
     16A  ALA*     4.6     1.8    -      -       +      -
     18A  ARG*     3.4    17.2    +      -       -      +
     21A  ASP*     2.6    41.7    +      -       +      +
     25A  PHE*     3.8    25.1    -      +       -      -
     62B  LEU*     3.6    33.9    -      -       +      -
     80B  GLU      2.9    18.3    +      -       -      +
     81B  VAL*     3.9     3.8    -      -       -      +
     83B  GLU*     1.3    76.1    -      -       -      +
     85B  ARG*     1.3    66.4    +      -       -      +
     87B  LYS*     3.1    25.3    +      -       +      -
     88B  VAL*     3.1    23.3    +      -       +      +
----------------------------------------------------------
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Residues in contact with ARG 85 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     59B  TRP*     3.9    21.5    -      -       +      +
     62B  LEU*     4.1    24.1    -      -       +      +
     63B  SER*     4.1    23.3    -      -       -      +
     66B  GLU*     2.5    30.2    +      -       -      +
     81B  VAL      2.8    21.8    +      -       -      +
     82B  ARG*     3.1    25.0    +      -       -      +
     84B  TYR*     1.3    72.5    -      -       -      +
     86B  GLU*     1.3    76.5    +      -       -      +
     88B  VAL*     3.3     3.7    +      -       -      +
     89B  GLU*     2.8    61.8    +      -       -      +
----------------------------------------------------------
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Residues in contact with GLU 86 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     82B  ARG*     2.9    49.8    +      -       -      +
     83B  GLU*     3.7    13.8    -      -       -      +
     85B  ARG*     1.3    99.6    +      -       -      +
     87B  LYS*     1.3    57.0    +      -       -      +
     89B  GLU*     3.4     9.5    -      -       -      +
     90B  THR*     2.9    36.7    +      -       -      +
----------------------------------------------------------
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Residues in contact with LYS 87 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     18A  ARG*     4.3     0.2    -      -       -      +
     21A  ASP*     3.2    31.3    +      -       -      -
     25A  PHE*     5.1     8.3    -      -       +      -
     83B  GLU      3.2    11.0    +      -       -      +
     84B  TYR*     3.1    29.0    +      -       +      +
     86B  GLU*     1.3    78.8    -      -       -      +
     88B  VAL*     1.3    62.7    +      -       +      +
     90B  THR*     3.3     6.9    +      -       -      -
     91B  GLU*     3.0    37.8    +      -       +      +
----------------------------------------------------------
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Residues in contact with VAL 88 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     18A  ARG*     3.8    31.0    -      -       -      +
     55B  GLN*     3.7    30.0    -      -       +      +
     58B  ALA*     4.0     5.4    -      -       +      -
     59B  TRP*     4.0    17.5    -      -       +      +
     62B  LEU*     3.7    18.6    -      -       +      -
     84B  TYR*     3.1    23.0    +      -       +      +
     85B  ARG      3.6     7.0    -      -       -      +
     87B  LYS*     1.3    76.8    -      -       +      +
     89B  GLU*     1.3    59.1    +      -       -      +
     91B  GLU*     3.2     8.6    +      -       -      +
     92B  LEU*     2.9    27.9    +      -       +      +
----------------------------------------------------------
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Residues in contact with GLU 89 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     59B  TRP*     2.8    34.0    +      -       -      +
     85B  ARG*     2.8    44.2    +      -       -      +
     86B  GLU*     3.4     9.3    -      -       -      +
     88B  VAL*     1.3    77.8    -      -       -      +
     90B  THR*     1.3    58.2    +      -       -      +
     92B  LEU*     3.2     6.0    +      -       -      +
     93B  GLN*     2.9    43.5    +      -       -      +
    134B  VAL*     3.6    35.1    -      -       +      +
----------------------------------------------------------
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Residues in contact with THR 90 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     86B  GLU*     2.9    21.8    +      -       -      +
     87B  LYS*     3.6     6.5    -      -       -      -
     89B  GLU*     1.3    76.5    -      -       -      +
     91B  GLU*     1.3    63.0    +      -       -      +
     93B  GLN*     3.4    16.4    +      -       +      +
     94B  GLY*     3.1    18.7    +      -       -      -
----------------------------------------------------------
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Residues in contact with GLU 91 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     18A  ARG*     2.7    39.2    +      -       -      -
     55B  GLN*     2.8    37.6    +      -       +      +
     87B  LYS*     3.0    24.8    +      -       +      +
     88B  VAL*     3.4     8.1    -      -       -      +
     90B  THR*     1.3    78.8    -      -       -      +
     92B  LEU*     1.3    62.9    +      -       -      +
     94B  GLY*     3.3     9.5    +      -       -      -
     95B  VAL*     3.4    11.5    +      -       +      +
----------------------------------------------------------
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Residues in contact with LEU 92 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     52B  VAL*     4.3     5.6    -      -       +      +
     55B  GLN*     3.6    24.5    -      -       +      +
     56B  ARG*     3.6    46.2    -      -       +      +
     59B  TRP*     5.1     4.5    -      -       +      -
     88B  VAL      2.9    17.2    +      -       -      +
     89B  GLU*     3.2     7.4    +      -       -      +
     91B  GLU*     1.3    76.4    -      -       -      +
     93B  GLN*     1.3    73.4    +      -       +      +
     95B  VAL*     3.3     4.5    +      -       -      +
     96B  CYS*     3.1    37.1    +      -       -      -
    130B  TYR*     4.5    14.8    -      -       +      +
    131B  LEU*     4.7     2.7    -      -       +      -
    134B  VAL*     4.7    18.4    -      -       +      -
----------------------------------------------------------
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Residues in contact with GLN 93 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     89B  GLU*     2.9    33.5    +      -       -      +
     90B  THR*     3.7    18.1    +      -       -      +
     91B  GLU      3.3     0.2    -      -       -      -
     92B  LEU*     1.3    74.7    -      -       +      +
     94B  GLY*     1.3    65.1    +      -       -      +
     96B  CYS*     3.9     0.5    -      -       -      +
     97B  ASP*     2.9    37.3    +      -       -      +
    131B  LEU*     3.8    27.5    +      -       +      +
    134B  VAL*     3.6    27.3    +      -       +      +
    135B  ALA*     5.5     4.0    -      -       -      +
----------------------------------------------------------
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Residues in contact with GLY 94 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     90B  THR      3.1    13.3    +      -       -      -
     91B  GLU*     3.3     5.8    +      -       -      -
     92B  LEU      3.1     0.6    -      -       -      -
     93B  GLN*     1.3    78.0    -      -       -      +
     95B  VAL*     1.3    60.2    +      -       -      +
     97B  ASP*     3.4     6.4    +      -       -      +
     98B  THR*     2.8    27.8    +      -       -      -
----------------------------------------------------------
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Residues in contact with VAL 95 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     48B  TYR*     3.8    30.7    -      -       +      -
     51B  VAL*     4.2    17.9    -      -       +      -
     52B  VAL*     4.6    14.1    -      -       +      -
     55B  GLN*     3.7    22.9    -      -       -      +
     91B  GLU*     3.4    12.9    +      -       +      +
     92B  LEU      3.3     7.5    +      -       -      +
     94B  GLY*     1.3    72.9    -      -       -      +
     96B  CYS*     1.3    60.9    +      -       -      +
     98B  THR*     3.0     9.1    +      -       -      -
     99B  VAL*     2.8    30.3    +      -       +      +
    127B  TYR*     5.0     0.4    -      -       +      -
----------------------------------------------------------
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Residues in contact with CYS 96 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     52B  VAL*     4.2     7.4    -      -       -      -
     92B  LEU*     3.1    36.5    +      -       -      +
     93B  GLN      3.9     0.2    -      -       -      +
     95B  VAL*     1.3    76.1    -      -       -      +
     97B  ASP*     1.3    58.7    +      -       -      +
     99B  VAL*     3.8     1.0    -      -       -      +
    100B  LEU*     2.8    36.7    +      -       -      +
    127B  TYR*     3.9    37.2    -      -       +      +
    130B  TYR*     4.0    12.8    -      -       -      -
    131B  LEU*     3.5    28.7    -      -       +      -
----------------------------------------------------------
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Residues in contact with ASP 97 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     93B  GLN*     2.9    28.9    +      -       -      +
     94B  GLY*     3.8     6.1    -      -       -      +
     96B  CYS*     1.3    75.5    -      -       -      +
     98B  THR*     1.3    59.1    +      -       -      +
    100B  LEU*     3.9     7.6    -      -       -      +
    101B  GLY*     2.9    25.5    +      -       -      -
    131B  LEU*     4.1    17.1    -      -       -      +
----------------------------------------------------------
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Residues in contact with THR 98 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     27B  LYS*     4.4    24.0    -      -       +      +
     48B  TYR*     3.9    22.2    -      -       +      +
     94B  GLY      2.8    19.5    +      -       -      -
     95B  VAL*     3.0    12.5    +      -       -      -
     97B  ASP*     1.3    75.1    -      -       -      +
     99B  VAL*     1.3    65.8    +      -       -      +
    101B  GLY*     3.3     1.6    +      -       -      -
    102B  LEU*     3.0    26.8    +      -       +      +
----------------------------------------------------------
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Residues in contact with VAL 99 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     48B  TYR*     3.3    42.4    -      -       +      -
     95B  VAL*     2.8    21.2    +      -       +      +
     96B  CYS      3.8     3.1    -      -       -      +
     98B  THR*     1.3    71.8    -      -       -      +
    100B  LEU*     1.3    58.7    +      -       -      +
    102B  LEU*     3.2    11.6    +      -       +      +
    103B  LEU*     3.0    40.4    +      -       +      +
    123B  MET*     3.7    20.2    -      -       +      -
    127B  TYR*     3.6    42.6    -      -       +      -
----------------------------------------------------------
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Residues in contact with LEU 100 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     96B  CYS      2.8    21.2    +      -       -      +
     97B  ASP*     3.9     8.1    -      -       -      +
     99B  VAL*     1.3    78.3    -      -       -      +
    101B  GLY*     1.3    57.1    +      -       -      +
    103B  LEU*     3.3     6.8    +      -       +      +
    104B  ASP*     2.9    32.1    +      -       -      +
    124B  LYS*     3.8    27.4    -      -       +      +
    127B  TYR*     4.0    14.1    -      -       +      -
    128B  TYR*     3.6    47.3    -      -       +      +
    131B  LEU*     3.6    29.2    -      -       +      -
----------------------------------------------------------
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Residues in contact with GLY 101 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     97B  ASP      2.9    18.2    +      -       -      -
     98B  THR*     3.8     1.3    -      -       -      -
    100B  LEU*     1.3    74.7    -      -       -      +
    102B  LEU*     1.3    63.5    +      -       -      +
    104B  ASP*     4.0     4.5    -      -       -      +
    105B  SER*     2.8    33.1    +      -       -      -
----------------------------------------------------------
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Residues in contact with LEU 102 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     27B  LYS*     3.9    39.3    -      -       +      -
     30B  VAL*     3.8    28.5    -      -       +      -
     31B  GLU*     4.1    15.7    -      -       +      +
     44B  LEU*     4.3    14.1    -      -       +      -
     48B  TYR*     4.2    24.0    -      -       +      +
     98B  THR*     3.0    17.8    +      -       +      +
     99B  VAL*     3.3     8.5    -      -       +      +
    101B  GLY*     1.3    77.3    -      -       -      +
    103B  LEU*     1.3    60.6    +      -       +      +
    106B  HIS*     3.1    35.5    +      -       +      +
    107B  LEU*     3.4    10.1    +      -       +      +
----------------------------------------------------------
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Residues in contact with LEU 103 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     99B  VAL*     3.0    39.1    +      -       +      +
    100B  LEU*     3.6    10.3    -      -       +      +
    102B  LEU*     1.3    79.1    -      -       +      +
    104B  ASP*     1.3    62.0    +      -       -      +
    107B  LEU*     3.3    28.8    +      -       +      -
    108B  ILE*     2.8    40.0    +      -       +      +
    120B  TYR*     3.8    30.7    -      -       +      +
    123B  MET*     4.0    15.3    -      -       +      +
    124B  LYS*     3.8    33.0    -      -       +      +
----------------------------------------------------------
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Residues in contact with ASP 104 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    100B  LEU      2.9    18.3    +      -       -      +
    101B  GLY*     4.1     5.6    -      -       -      +
    103B  LEU*     1.3    78.8    -      -       -      +
    105B  SER*     1.3    59.6    +      -       -      +
    106B  HIS      3.7     0.4    -      -       -      -
    108B  ILE*     4.0    11.2    -      -       -      +
    110B  GLU*     5.7     1.7    -      -       -      +
    124B  LYS*     2.5    35.6    +      -       -      +
    128B  TYR*     6.2     0.4    -      -       -      -
----------------------------------------------------------
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Residues in contact with SER 105 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    101B  GLY      2.8    21.2    +      -       -      -
    104B  ASP*     1.3    79.5    -      -       -      +
    106B  HIS*     1.3    82.3    +      -       -      +
    110B  GLU*     3.4    13.0    -      -       -      +
----------------------------------------------------------
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Residues in contact with HIS 106 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     30B  VAL*     3.7    29.7    +      -       +      +
     31B  GLU*     3.9    21.5    -      -       +      +
     33B  GLY*     5.1     7.5    -      -       -      +
     35B  GLU*     5.7     3.8    -      -       -      +
    102B  LEU*     3.1    27.0    +      -       +      +
    104B  ASP      3.7     1.0    -      -       -      -
    105B  SER*     1.3   106.7    +      -       -      +
    107B  LEU*     1.3    62.9    +      -       -      +
    110B  GLU*     3.1    27.7    +      -       -      +
    249B   CA      2.0    31.3    -      -       -      -
----------------------------------------------------------
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Residues in contact with LEU 107 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     30B  VAL*     4.0    15.9    -      -       +      -
     35B  GLU*     5.8     2.9    -      -       -      -
     36B  LEU*     4.0    17.0    -      -       +      +
     44B  LEU*     3.7    24.7    -      -       +      -
    102B  LEU*     3.6    21.8    -      -       +      +
    103B  LEU*     3.3    30.4    +      -       +      +
    106B  HIS*     1.3    84.3    -      -       +      +
    108B  ILE*     1.3    69.6    +      -       -      +
    109B  LYS      3.2     1.2    +      -       -      -
    110B  GLU*     3.0    13.9    +      -       -      +
    111B  ALA*     4.3     2.9    +      -       -      +
    120B  TYR*     3.6    49.2    -      -       +      +
----------------------------------------------------------
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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