Contacts of the helix formed by residues 98 - 126 (chain D) in PDB entry 1ORZ


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 TRP 98 (chain D).
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     92D  GLU      3.0    20.4    -      -       -      +
     93D  ARG*     2.9    25.8    -      -       +      -
     94D  VAL*     2.9    38.1    -      -       +      +
     96D  GLY      3.2    13.5    -      -       -      -
     97D  VAL*     1.3    76.0    -      -       +      +
     99D  HIS*     1.3    87.2    +      +       +      +
    100D  LYS      3.1     2.5    -      -       -      -
    101D  TYR*     3.1    14.2    +      -       -      +
    102D  ALA*     3.7     4.1    +      -       -      +
----------------------------------------------------------
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Residues in contact with HIS 99 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     97D  VAL*     3.0    16.4    -      -       +      +
     98D  TRP*     1.3    97.1    -      +       +      +
    100D  LYS*     1.3    57.7    +      -       -      +
    102D  ALA*     3.8     6.7    -      -       -      +
    103D  MET*     2.7    54.8    +      -       +      +
----------------------------------------------------------
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Residues in contact with LYS 100 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     90D  ILE*     4.1    14.5    -      -       +      +
     92D  GLU*     3.2    50.7    +      -       +      +
     97D  VAL*     3.5    13.1    -      -       +      +
     98D  TRP      3.1     1.0    +      -       -      -
     99D  HIS*     1.3    80.4    -      -       -      +
    101D  TYR*     1.3    61.5    +      -       -      +
    103D  MET*     4.9     1.3    -      -       -      -
    104D  TYR*     2.8    51.7    +      -       +      +
----------------------------------------------------------
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Residues in contact with TYR 101 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     22D  ASP*     3.0    27.4    +      -       -      +
     83D  ASN*     3.3    11.3    +      -       -      -
     86D  ILE*     3.0    40.5    -      -       +      +
     87D  THR*     3.0    31.9    +      -       +      +
     90D  ILE*     3.2    34.7    -      -       +      +
     92D  GLU      3.5     8.3    -      -       -      +
     98D  TRP      3.1    12.8    +      -       -      +
    100D  LYS*     1.3    77.8    -      -       -      +
    102D  ALA*     1.3    71.9    +      -       +      +
    104D  TYR*     3.4     2.5    +      -       -      +
    105D  MET*     3.1    34.9    +      -       -      +
----------------------------------------------------------
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Residues in contact with ALA 102 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     98D  TRP      3.7     3.4    +      -       -      +
     99D  HIS*     3.2    11.0    +      -       -      +
    101D  TYR*     1.3    87.3    -      -       +      +
    103D  MET*     1.3    67.2    +      -       +      +
    105D  MET*     3.2     6.7    +      -       -      +
    106D  LEU*     2.9    24.1    +      -       -      +
----------------------------------------------------------
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Residues in contact with MET 103 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     99D  HIS*     2.7    40.1    +      -       +      +
    100D  LYS*     4.2     2.9    -      -       -      +
    102D  ALA*     1.3    75.6    -      -       +      +
    104D  TYR*     1.3    62.6    +      -       +      +
    106D  LEU*     3.1    32.6    +      -       +      +
    107D  GLY*     2.7    26.5    +      -       -      -
----------------------------------------------------------
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Residues in contact with TYR 104 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     79D  TYR*     4.3     0.2    -      -       -      -
     86D  ILE*     5.0    10.8    -      -       +      -
     90D  ILE*     5.9     7.0    -      -       +      -
    100D  LYS*     2.8    52.0    +      -       +      +
    101D  TYR*     4.1     3.4    -      -       -      +
    103D  MET*     1.3    79.5    -      -       +      +
    105D  MET*     1.3    60.8    +      -       -      +
    107D  GLY*     3.0     1.8    +      -       -      +
    108D  LEU*     2.7    32.7    +      -       -      +
----------------------------------------------------------
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Residues in contact with MET 105 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     22D  ASP*     3.3    38.1    -      -       +      +
     79D  TYR*     2.8    31.7    +      -       +      +
     83D  ASN*     2.9    32.8    -      -       +      +
     86D  ILE*     3.5    19.9    -      -       +      +
    101D  TYR*     3.1    43.2    +      -       +      +
    102D  ALA*     3.2     8.8    +      -       -      +
    104D  TYR*     1.3    76.5    -      -       -      +
    106D  LEU*     1.3    64.0    +      -       -      +
    109D  GLY*     2.9    15.4    +      -       -      -
----------------------------------------------------------
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Residues in contact with LEU 106 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    102D  ALA      2.9    13.5    +      -       -      +
    103D  MET*     3.2    35.0    -      -       +      +
    105D  MET*     1.3    78.0    -      -       -      +
    107D  GLY*     1.3    65.9    +      -       -      +
    109D  GLY*     3.9     0.7    -      -       -      -
    110D  SER*     3.1    25.4    +      -       -      -
----------------------------------------------------------
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Residues in contact with GLY 107 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    103D  MET*     2.7    18.5    +      -       -      -
    104D  TYR*     3.0     3.1    +      -       -      -
    106D  LEU*     1.3    78.8    -      -       -      +
    108D  LEU*     1.3    60.9    +      -       -      +
    110D  SER*     3.1     6.8    +      -       -      -
    111D  ALA*     2.9    22.1    +      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 108 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     54C  GLY      5.9     5.8    -      -       -      +
     79D  TYR*     2.9    39.0    -      -       +      +
     82D  PHE*     3.1    48.2    -      -       +      -
     86D  ILE*     5.4     2.0    -      -       +      -
    104D  TYR      2.7    15.7    +      -       -      +
    107D  GLY*     1.3    72.9    -      -       -      +
    109D  GLY*     1.3    61.7    +      -       -      +
    111D  ALA*     3.1    13.8    +      -       +      +
    112D  VAL*     2.9    33.2    +      -       +      +
    115D  PHE*     6.0     1.8    -      -       +      -
----------------------------------------------------------
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Residues in contact with GLY 109 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     24D  TYR*     4.6     8.7    -      -       -      -
     79D  TYR*     3.5    13.4    -      -       -      -
    105D  MET      2.9    16.3    +      -       -      -
    106D  LEU      3.9     1.1    -      -       -      -
    108D  LEU*     1.3    76.2    -      -       -      +
    110D  SER*     1.3    62.6    +      -       -      +
    112D  VAL*     3.2     5.4    +      -       -      +
    113D  SER*     2.9    22.9    +      -       -      -
----------------------------------------------------------
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Residues in contact with SER 110 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    106D  LEU*     3.1    19.7    +      -       -      -
    107D  GLY*     3.4    10.5    -      -       -      -
    109D  GLY*     1.3    76.4    -      -       -      +
    111D  ALA*     1.3    63.8    +      -       -      +
    113D  SER*     2.6    26.5    +      -       -      -
    114D  LEU*     2.8    10.0    +      -       -      +
----------------------------------------------------------
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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
----------------------------------------------------------
    107D  GLY      2.9    12.6    +      -       -      +
    108D  LEU*     3.1    20.2    +      -       +      +
    110D  SER*     1.3    75.8    -      -       -      +
    112D  VAL*     1.3    62.6    +      -       -      +
    114D  LEU*     3.1    12.1    +      -       -      +
    115D  PHE*     2.8    44.7    +      -       +      -
----------------------------------------------------------
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Residues in contact with VAL 112 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     24D  TYR*     5.5     1.8    -      -       -      +
     72D  VAL      5.3     2.3    -      -       -      +
     75D  LEU*     4.6     9.9    -      -       +      +
     76D  GLY*     3.0    39.5    -      -       -      +
     79D  TYR*     3.8    22.7    -      -       +      -
     82D  PHE*     5.8     3.6    -      -       +      -
    108D  LEU*     2.9    26.4    +      -       +      +
    109D  GLY*     3.4     8.3    -      -       -      +
    111D  ALA*     1.3    76.4    -      -       -      +
    113D  SER*     1.3    65.8    +      -       -      +
    115D  PHE*     3.1    23.7    +      -       +      +
    116D  GLY*     3.3     8.1    +      -       -      -
----------------------------------------------------------
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Residues in contact with SER 113 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    109D  GLY      2.9    13.6    +      -       -      -
    110D  SER*     2.6    26.5    +      -       -      -
    112D  VAL*     1.3    77.0    -      -       -      +
    114D  LEU*     1.3    62.3    +      -       -      +
    116D  GLY*     3.1    10.6    +      -       -      -
    117D  ILE*     3.2    27.3    +      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 114 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     58C  TYR*     5.4    13.5    -      -       +      -
    110D  SER*     2.8    12.8    +      -       -      +
    111D  ALA*     3.3    14.6    -      -       -      +
    113D  SER*     1.3    76.0    +      -       -      +
    115D  PHE*     1.3    63.3    +      -       +      +
    117D  ILE*     3.2    12.5    +      -       +      +
    118D  TYR*     2.7    46.1    +      -       +      +
----------------------------------------------------------
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Residues in contact with PHE 115 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     54C  GLY      4.9     8.7    -      -       -      -
     57C  PHE*     3.9    21.0    -      +       +      -
     58C  TYR*     2.9    65.1    -      +       +      -
     61C  THR*     3.9    22.7    -      -       +      +
     62C  ILE*     5.4     0.2    -      -       +      -
     72D  VAL*     5.0     5.1    -      -       +      +
     75D  LEU*     5.2     9.0    -      -       +      -
    108D  LEU*     6.0     2.2    -      -       +      -
    111D  ALA*     2.8    47.3    +      -       +      -
    112D  VAL*     3.1    15.9    +      -       +      +
    114D  LEU*     1.3    81.4    -      -       +      +
    116D  GLY*     1.3    56.4    +      -       -      +
    118D  TYR*     3.4     4.9    +      -       +      +
    119D  LYS*     2.8    31.6    +      -       -      +
----------------------------------------------------------
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Residues in contact with GLY 116 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     72D  VAL*     4.1    23.9    +      -       -      +
     73D  MET*     6.1     0.9    -      -       -      -
    112D  VAL      3.3     5.6    +      -       -      -
    113D  SER*     3.1     7.0    +      -       -      -
    115D  PHE*     1.3    79.8    -      -       -      +
    117D  ILE*     1.3    60.4    +      -       -      +
    119D  LYS*     3.1     7.6    +      -       -      +
    120D  LEU*     2.8    28.0    -      -       -      +
----------------------------------------------------------
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Residues in contact with ILE 117 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    113D  SER*     3.2    25.8    +      -       -      +
    114D  LEU*     3.9    12.8    -      -       +      +
    116D  GLY*     1.3    71.3    -      -       -      +
    118D  TYR*     1.3    68.6    +      -       -      +
    120D  LEU*     3.0    19.7    +      -       +      +
    121D  GLU*     3.1    12.9    +      -       +      +
----------------------------------------------------------
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Residues in contact with TYR 118 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     61C  THR*     3.6    25.6    -      -       +      -
     62C  ILE*     5.8     4.9    -      -       +      -
     65C  GLY*     3.7    30.4    +      -       -      -
    114D  LEU*     2.7    36.8    +      -       +      +
    115D  PHE*     3.9     4.9    -      -       +      +
    117D  ILE*     1.3    73.7    -      -       -      +
    119D  LYS*     1.3    63.8    +      -       -      +
    121D  GLU*     3.1    30.3    +      -       +      +
    122D  THR*     2.9    39.7    +      -       +      +
    125D  ASP*     5.5     0.9    +      -       -      -
----------------------------------------------------------
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Residues in contact with LYS 119 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     57C  PHE*     5.5     2.7    -      -       +      -
     61C  THR*     5.3     4.9    -      -       +      -
     68D  SER*     4.5     8.3    -      -       -      +
     69D  PHE*     2.9    48.7    +      -       +      +
     72D  VAL*     2.9    48.0    -      -       +      +
    115D  PHE      2.8    19.5    +      -       -      +
    116D  GLY      3.2     1.8    -      -       -      +
    117D  ILE      3.0     0.2    -      -       -      -
    118D  TYR*     1.3    77.4    -      -       -      +
    120D  LEU*     1.3    99.2    +      -       -      +
    122D  THR*     2.7    28.6    -      -       +      +
    123D  GLU*     2.9     6.0    +      -       +      +
    127D  VAL*     5.6     2.0    -      -       +      -
    128D  VAL*     5.4     0.4    -      -       +      -
----------------------------------------------------------
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Residues in contact with LEU 120 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     69D  PHE*     3.8    10.5    -      -       +      -
    116D  GLY*     2.8    29.8    -      -       -      +
    117D  ILE*     3.0    10.4    +      -       +      +
    119D  LYS*     1.3   111.8    -      -       -      +
    121D  GLU*     1.3    64.1    +      -       -      +
    123D  GLU*     2.9    36.7    +      -       -      +
    124D  ASN*     3.1     8.5    +      -       -      +
----------------------------------------------------------
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Residues in contact with GLU 121 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    117D  ILE*     3.1    11.7    +      -       +      +
    118D  TYR*     3.1    39.2    +      -       +      +
    120D  LEU*     1.3    75.4    -      -       -      +
    122D  THR*     1.3    60.2    +      -       -      +
    124D  ASN*     2.5    34.4    +      -       -      +
    125D  ASP*     3.3    18.8    +      -       -      +
----------------------------------------------------------
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Residues in contact with THR 122 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     61C  THR*     5.4     1.8    -      -       +      -
     64C  PHE*     2.8    41.8    +      -       +      -
     65C  GLY*     4.1     7.1    +      -       -      -
     68C  GLY*     5.5     0.3    -      -       -      -
    118D  TYR*     2.9    35.0    +      -       +      +
    119D  LYS*     2.7    33.9    -      -       +      +
    121D  GLU*     1.3    79.0    -      -       -      +
    123D  GLU*     1.3    60.6    +      -       -      +
    125D  ASP*     2.6    41.0    +      -       -      +
    126D  GLY      3.3     1.0    +      -       -      -
    127D  VAL*     3.4     5.0    +      -       +      -
----------------------------------------------------------
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Residues in contact with GLU 123 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     69D  PHE*     2.9    30.9    -      -       +      -
    119D  LYS      2.9    13.6    +      -       -      +
    120D  LEU*     2.9    26.5    +      -       -      +
    122D  THR*     1.3    76.6    -      -       -      +
    124D  ASN*     1.3    69.4    +      -       -      +
    126D  GLY      3.2     1.6    +      -       -      -
    127D  VAL*     2.7    29.2    +      -       +      -
    128D  VAL*     2.6    44.5    +      -       +      +
----------------------------------------------------------
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Residues in contact with ASN 124 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    120D  LEU      3.1     4.2    +      -       -      +
    121D  GLU*     2.5    37.8    +      -       -      +
    123D  GLU*     1.3    85.4    -      -       +      +
    125D  ASP*     1.3    87.2    +      -       -      +
    126D  GLY*     3.2     0.9    +      -       -      -
----------------------------------------------------------
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Residues in contact with ASP 125 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     65C  GLY      5.5     2.4    -      -       -      +
     68C  GLY*     4.4    11.5    -      -       -      -
     70C  LEU*     4.2    24.6    +      -       -      +
     71C  GLY*     5.1     6.0    -      -       -      -
    118D  TYR*     5.5     0.7    +      -       -      -
    121D  GLU*     3.3    10.7    -      -       -      +
    122D  THR*     2.6    42.5    +      -       -      +
    124D  ASN*     1.3    94.3    -      -       -      +
    126D  GLY*     1.3    74.5    +      -       -      +
    127D  VAL      3.8     1.6    +      -       -      -
----------------------------------------------------------
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Residues in contact with GLY 126 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     69C  LEU*     2.6    39.8    -      -       -      +
     70C  LEU      4.9     0.2    -      -       -      -
    123D  GLU      3.7     2.0    -      -       -      -
    124D  ASN      3.2     3.1    -      -       -      -
    125D  ASP*     1.3    89.8    +      -       -      +
    127D  VAL*     1.4    51.7    +      -       -      +
    128D  VAL      3.5     3.2    +      -       -      +
    130D  LEU*     4.4     1.6    -      -       -      +
    131D  VAL*     2.6    25.3    +      -       -      -
----------------------------------------------------------
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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