Contacts of the helix formed by residues 86 - 112 (chain D) in PDB entry 1BL8


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 LEU 86 (chain D).
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     63C  PRO      5.9     3.1    -      -       -      +
     84D  VAL      3.6     3.8    +      -       -      -
     85D  THR*     1.3    75.6    -      -       +      +
     87D  TRP*     1.3    89.6    +      -       +      +
     89D  ARG*     3.2    24.2    +      -       +      +
     90D  CYS*     3.2     9.4    +      -       -      +
----------------------------------------------------------
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Residues in contact with TRP 87 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     46D  LEU*     6.3     3.4    -      -       +      -
     50D  ALA*     4.4    13.7    -      -       +      -
     85D  THR*     3.1     7.8    -      -       +      +
     86D  LEU*     1.3   106.4    -      -       +      +
     88D  GLY*     1.3    58.2    +      -       -      +
     89D  ARG      2.9     1.6    -      -       -      -
     90D  CYS*     2.5    43.0    +      -       +      +
     91D  VAL*     3.0    17.0    +      -       +      +
----------------------------------------------------------
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Residues in contact with GLY 88 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     47D  ALA*     4.8     4.3    -      -       -      -
     50D  ALA*     4.0    13.2    -      -       -      +
     51D  GLU*     4.4     4.0    -      -       -      -
     68D  TRP*     4.2     2.9    -      -       -      -
     83D  PRO*     3.2    27.3    -      -       -      +
     85D  THR*     2.9    19.5    +      -       -      -
     87D  TRP*     1.3    79.7    -      -       -      +
     89D  ARG*     1.3    58.6    +      -       -      +
     91D  VAL*     3.6     9.6    +      -       -      +
     92D  ALA*     3.2    13.7    +      -       -      +
----------------------------------------------------------
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Residues in contact with ARG 89 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     58C  GLN*     5.7     4.6    -      -       -      +
     64C  ARG*     5.7     5.1    -      -       -      +
     67C  TRP*     3.1    69.3    -      -       +      +
     80C  ASP*     4.2     7.7    +      -       -      -
     81C  LEU*     5.6     2.8    -      -       -      +
     82D  TYR*     4.5     5.9    -      -       -      -
     83D  PRO*     2.9    36.1    +      -       -      +
     84D  VAL*     3.6    26.9    +      -       -      +
     85D  THR      2.8    28.0    +      -       -      +
     86D  LEU*     3.2    17.3    -      -       +      +
     88D  GLY*     1.3    73.7    -      -       -      +
     90D  CYS*     1.3    67.5    +      -       -      +
     92D  ALA*     3.1    14.6    -      -       -      +
     93D  VAL*     3.1     8.1    +      -       -      +
----------------------------------------------------------
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Residues in contact with CYS 90 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     86D  LEU*     3.2    10.5    +      -       -      -
     87D  TRP*     2.5    32.9    +      -       +      +
     89D  ARG*     1.3    69.1    -      -       -      +
     91D  VAL*     1.3    68.7    +      -       +      +
     92D  ALA      2.9     1.1    -      -       -      -
     93D  VAL*     2.7    23.1    +      -       -      +
     94D  VAL*     3.0    14.4    +      -       +      +
----------------------------------------------------------
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Residues in contact with VAL 91 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     43D  GLY*     3.5    39.9    -      -       -      +
     46D  LEU*     3.4    30.7    -      -       +      +
     47D  ALA*     4.0    16.6    -      -       +      +
     50D  ALA*     5.5     0.7    -      -       +      -
     68D  TRP*     4.2     4.7    -      -       +      -
     87D  TRP*     3.0    14.5    +      -       +      +
     88D  GLY*     3.7     7.9    -      -       -      +
     90D  CYS*     1.3    76.3    -      -       +      +
     92D  ALA*     1.3    60.6    +      -       -      +
     94D  VAL*     3.5     9.9    +      -       +      +
     95D  VAL*     2.9    25.5    +      -       -      +
----------------------------------------------------------
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Residues in contact with ALA 92 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     67C  TRP*     3.5    26.9    -      -       +      -
     78C  TYR*     4.8     2.0    -      -       -      +
     68D  TRP*     3.5    21.3    -      -       +      -
     83D  PRO*     3.8     0.2    -      -       +      -
     88D  GLY      3.2     9.4    +      -       -      +
     89D  ARG      3.1    12.5    +      -       -      +
     90D  CYS      2.7     1.2    +      -       -      -
     91D  VAL*     1.3    73.6    -      -       -      +
     93D  VAL*     1.3    67.9    +      -       -      +
     95D  VAL*     2.7    28.4    -      -       -      +
     96D  MET*     2.8    16.8    +      -       -      +
----------------------------------------------------------
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Residues in contact with VAL 93 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     67C  TRP*     4.8     3.1    -      -       +      -
     70C  VAL*     3.3    37.9    -      -       +      -
     89D  ARG      3.1     9.0    +      -       -      +
     90D  CYS*     2.7    16.8    +      -       -      +
     92D  ALA*     1.3    74.3    -      -       -      +
     94D  VAL*     1.3    72.5    +      -       +      +
     96D  MET*     2.8    26.7    +      -       -      +
     97D  VAL*     3.0    17.9    +      -       +      +
----------------------------------------------------------
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Residues in contact with VAL 94 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     39D  VAL*     4.1    17.0    -      -       +      -
     43D  GLY*     6.4     1.3    -      -       -      -
     90D  CYS*     3.0    10.7    +      -       +      +
     91D  VAL*     3.6    13.9    -      -       +      +
     93D  VAL*     1.3    88.4    -      -       +      +
     95D  VAL*     1.3    59.8    +      -       -      +
     96D  MET      2.6    11.8    +      -       -      -
     97D  VAL*     3.1     9.7    +      -       +      +
     98D  ALA*     3.1    21.2    +      -       +      +
----------------------------------------------------------
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Residues in contact with VAL 95 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     39D  VAL*     3.8    21.3    -      -       +      +
     40D  LEU*     3.9    16.4    -      -       +      -
     43D  GLY*     5.4     1.8    -      -       -      -
     68D  TRP*     4.0    11.0    -      -       +      -
     69D  SER*     3.5    37.7    -      -       -      +
     72D  THR*     3.4    13.9    -      -       +      -
     73D  ALA*     3.4    15.3    -      -       -      +
     91D  VAL*     2.9    20.3    +      -       +      +
     92D  ALA*     2.7    30.7    -      -       -      +
     94D  VAL*     1.3    75.6    -      -       -      +
     96D  MET*     1.3    61.2    +      -       -      +
     98D  ALA*     3.9     3.0    -      -       -      +
     99D  GLY      3.8     4.0    +      -       -      -
----------------------------------------------------------
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Residues in contact with MET 96 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     67C  TRP*     5.5     3.8    -      -       +      -
     70C  VAL*     3.9     8.1    -      -       +      +
     71C  GLU*     3.8    17.9    -      -       +      -
     74C  THR*     2.9    49.6    -      -       +      +
     76C  VAL*     3.2    17.0    -      -       +      -
     78C  TYR*     5.4     4.3    -      -       +      -
     72D  THR*     3.6    30.9    -      -       +      +
     73D  ALA      4.3     1.9    -      -       -      +
     75D  THR*     5.3     0.2    -      -       -      -
     92D  ALA*     2.8    26.3    +      -       -      +
     93D  VAL*     2.8    16.6    +      -       -      +
     94D  VAL      2.6     5.3    +      -       -      -
     95D  VAL*     1.3    70.6    -      -       -      +
     97D  VAL*     1.3    56.4    +      -       +      +
     98D  ALA      3.1     0.9    -      -       -      -
     99D  GLY*     2.7    26.3    +      -       -      -
    100D  ILE*     3.1    13.6    +      -       -      +
----------------------------------------------------------
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Residues in contact with VAL 97 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    103C  PHE*     4.7    18.6    -      -       +      -
     93D  VAL*     3.0    24.2    +      -       +      +
     94D  VAL*     3.6    10.5    -      -       +      +
     96D  MET*     1.3    73.7    -      -       +      +
     98D  ALA*     1.3    81.3    +      -       +      +
     99D  GLY      2.7     0.7    +      -       -      -
    100D  ILE*     2.8    13.3    +      -       +      +
    101D  THR*     2.6    34.6    +      -       +      +
----------------------------------------------------------
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Residues in contact with ALA 98 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     36D  LEU*     3.4    18.8    -      -       +      -
     39D  VAL*     3.6    30.3    -      -       +      -
     94D  VAL*     3.1    13.8    +      -       +      +
     95D  VAL      3.9     3.4    -      -       -      +
     97D  VAL*     1.3    85.1    -      -       +      +
     99D  GLY*     1.3    53.7    +      -       -      +
    101D  THR*     4.2     5.3    -      -       -      +
    102D  SER*     2.6    39.0    +      -       -      -
----------------------------------------------------------
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Residues in contact with GLY 99 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     36D  LEU*     3.5    13.3    -      -       -      +
     73D  ALA      3.4    21.3    -      -       -      -
     75D  THR*     5.5     0.7    -      -       -      -
     95D  VAL      3.8     1.6    +      -       -      -
     96D  MET      2.7    16.2    +      -       -      -
     98D  ALA*     1.3    71.5    -      -       -      +
    100D  ILE*     1.3    64.2    +      -       -      -
    101D  THR      2.9     1.3    -      -       -      -
    103D  PHE*     3.0    36.6    +      -       -      +
----------------------------------------------------------
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Residues in contact with ILE 100 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     74C  THR*     3.2    37.9    -      -       +      +
    103C  PHE*     3.4    62.8    -      -       +      -
    107C  THR*     5.1     1.4    +      -       -      -
     73D  ALA      4.3     1.2    +      -       -      -
     75D  THR*     4.5    13.0    -      -       +      +
     96D  MET*     3.1    10.0    +      -       +      +
     97D  VAL*     2.8    14.4    +      -       +      +
     99D  GLY*     1.3    70.4    -      -       -      +
    101D  THR*     1.3    56.6    +      -       -      +
    103D  PHE*     4.4     2.1    -      -       -      +
    104D  GLY*     3.3    19.6    +      -       -      -
----------------------------------------------------------
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Residues in contact with THR 101 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    103C  PHE*     4.9    10.0    -      -       -      -
    106C  VAL*     4.9    13.3    -      -       -      +
    110C  LEU*     5.3     2.3    -      -       +      +
     97D  VAL*     2.6    28.4    +      -       +      +
     98D  ALA*     4.2     4.7    -      -       -      +
    100D  ILE*     1.3    71.7    -      -       -      +
    102D  SER*     1.3    64.6    +      -       -      +
    103D  PHE      2.9     1.8    -      -       -      -
    104D  GLY*     2.6    25.2    +      -       -      +
    105D  LEU*     3.2    24.1    +      -       +      +
----------------------------------------------------------
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Residues in contact with SER 102 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     32D  ALA*     5.1    10.1    -      -       -      +
     33D  THR*     4.5    15.6    -      -       -      +
     36D  LEU*     3.4    39.5    -      -       -      +
     98D  ALA      2.6    25.7    +      -       -      -
     99D  GLY      4.3     0.4    -      -       -      -
    101D  THR*     1.3    77.3    -      -       -      +
    103D  PHE*     1.3    66.0    +      -       -      +
    105D  LEU*     3.9    10.1    +      -       -      +
    106D  VAL*     3.6    19.2    +      -       -      +
----------------------------------------------------------
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Residues in contact with PHE 103 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     97A  VAL*     4.7    19.1    -      -       +      -
    100A  ILE*     3.5    54.7    -      -       +      -
    101A  THR*     5.0     8.5    -      -       -      -
     36D  LEU*     4.6    16.6    -      -       +      -
     73D  ALA*     4.8     9.4    -      -       +      -
     74D  THR*     5.1     4.5    -      -       +      -
     99D  GLY*     3.0    28.0    +      -       -      +
    100D  ILE*     4.4     2.0    -      -       -      +
    101D  THR      2.7     4.2    +      -       -      -
    102D  SER*     1.3    80.4    +      -       -      +
    104D  GLY*     1.3    64.0    +      -       -      +
    106D  VAL*     3.2    19.2    +      -       +      +
    107D  THR*     3.2    18.4    +      -       -      -
----------------------------------------------------------
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Residues in contact with GLY 104 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    107C  THR*     3.6    23.3    +      -       -      +
    110C  LEU*     4.8     4.0    -      -       -      -
    100D  ILE      3.3    11.7    +      -       -      -
    101D  THR*     2.6    15.3    +      -       -      -
    103D  PHE*     1.3    73.8    -      -       -      +
    105D  LEU*     1.3    49.1    +      -       -      -
    107D  THR*     2.8    12.5    +      -       -      +
    108D  ALA*     2.7    33.3    +      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 105 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    110C  LEU*     3.3    31.0    -      -       +      +
    113C  TRP*     5.7     3.1    -      -       +      -
    114C  PHE*     3.9    19.3    -      -       +      -
     28D  ALA*     3.4    35.4    -      -       +      +
     29D  ALA*     4.2     7.2    -      -       +      +
     32D  ALA*     4.5    12.3    -      -       +      -
    101D  THR*     3.2    27.2    +      -       +      +
    102D  SER*     4.0     8.3    -      -       -      +
    104D  GLY*     1.3    74.6    -      -       -      +
    106D  VAL*     1.3    52.4    +      -       -      +
    108D  ALA*     2.6    12.5    +      -       -      +
    109D  ALA*     2.6    36.0    +      -       -      +
----------------------------------------------------------
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Residues in contact with VAL 106 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    101A  THR*     5.0    11.7    -      -       -      +
     29D  ALA*     4.3    14.8    -      -       +      -
     33D  THR*     4.5    16.8    -      -       +      -
    102D  SER      3.6    16.2    -      -       -      +
    103D  PHE*     3.2    21.7    +      -       +      +
    105D  LEU*     1.3    75.1    -      -       -      +
    107D  THR*     1.3    59.8    +      -       -      +
    109D  ALA*     3.6     6.9    -      -       +      +
    110D  LEU*     2.9    47.2    +      -       +      +
----------------------------------------------------------
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Residues in contact with THR 107 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    100A  ILE      5.2     1.4    +      -       -      -
    104A  GLY*     3.7    25.5    -      -       -      +
    107A  THR*     4.2    20.5    -      -       +      +
    108A  ALA*     4.7     1.8    -      -       -      +
    107C  THR*     4.0    23.6    -      -       +      -
    111C  ALA*     5.9     0.4    -      -       +      -
    103D  PHE      3.2     9.5    +      -       -      -
    104D  GLY*     2.8    14.1    +      -       -      +
    106D  VAL*     1.3    73.6    -      -       -      +
    108D  ALA*     1.3    58.3    +      -       -      +
    110D  LEU*     3.2     9.3    +      -       -      +
    111D  ALA*     2.7    36.5    +      -       +      +
----------------------------------------------------------
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Residues in contact with ALA 108 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    107C  THR      4.5     1.6    -      -       -      +
    110C  LEU*     3.7    40.2    -      -       +      +
    111C  ALA*     3.7    10.3    -      -       -      +
    114C  PHE*     3.7     9.6    -      -       +      -
    104D  GLY      2.7    10.6    +      -       -      +
    105D  LEU*     2.6    16.7    +      -       -      +
    107D  THR*     1.3    73.9    -      -       -      +
    109D  ALA*     1.3    67.1    +      -       -      +
    111D  ALA*     2.8    15.3    +      -       -      +
    112D  THR*     3.0    14.3    +      -       -      +
----------------------------------------------------------
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Residues in contact with ALA 109 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    114C  PHE*     3.4     6.8    -      -       +      -
     25D  HIS*     2.9    39.0    +      -       -      +
     26D  TRP*     3.4    20.6    -      -       +      -
     29D  ALA*     4.1    12.1    -      -       +      -
    105D  LEU      2.6    17.9    +      -       -      +
    106D  VAL*     3.6     7.6    -      -       +      +
    108D  ALA*     1.3    76.1    -      -       -      +
    110D  LEU*     1.3    61.4    +      -       +      +
    113D  TRP*     3.0    18.0    +      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 110 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    101A  THR*     5.4     2.9    -      -       +      +
    104A  GLY*     5.0     1.3    -      -       -      -
    105A  LEU*     3.4    48.0    -      -       +      +
    108A  ALA*     3.9    10.8    -      -       +      -
     26D  TRP*     3.5    30.7    -      -       +      -
    106D  VAL*     2.9    35.2    +      -       +      +
    107D  THR*     3.2     9.8    +      -       -      +
    108D  ALA      3.2     0.4    -      -       -      -
    109D  ALA*     1.3    78.7    -      -       +      +
    111D  ALA*     1.3    63.5    +      -       -      +
    112D  THR      3.3     0.5    +      -       -      -
    113D  TRP*     3.4    10.2    +      -       +      +
    114D  PHE*     3.3    29.1    +      -       +      +
----------------------------------------------------------
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Residues in contact with ALA 111 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    107A  THR*     6.0     0.2    -      -       +      -
    108A  ALA*     3.8    15.6    -      -       -      +
    111A  ALA*     4.3    18.9    -      -       +      +
    112A  THR*     3.5    21.5    -      -       -      +
    111C  ALA*     4.1    22.2    -      -       +      +
    115C  VAL*     5.5     0.4    -      -       -      -
    107D  THR*     2.7    20.4    +      -       +      +
    108D  ALA*     2.8    12.6    +      -       -      +
    110D  LEU*     1.3    73.0    -      -       -      +
    112D  THR*     1.3    60.5    +      -       -      +
    115D  VAL*     3.6     9.4    +      -       -      +
----------------------------------------------------------
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Residues in contact with THR 112 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    111C  ALA      3.3    14.4    -      -       -      +
    114C  PHE*     3.0    40.6    +      -       +      -
    115C  VAL*     3.7    14.6    -      -       -      -
     25D  HIS*     2.6    28.8    +      -       -      -
    108D  ALA      3.0    14.6    -      -       -      +
    109D  ALA      3.7     1.1    -      -       -      +
    111D  ALA*     1.3    73.6    -      -       -      +
    113D  TRP*     1.3    49.2    +      -       -      +
    114D  PHE      2.8     5.8    -      -       -      -
    115D  VAL*     2.5    29.4    +      -       -      +
    116D  GLY*     2.6    16.5    +      -       -      -
----------------------------------------------------------
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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
------------------------------------------------------------
  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