Contacts of the helix formed by residues 108 - 136 (chain D) in PDB entry 5AIX


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

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

Legend:
Dist - nearest distance (Å) between atoms of two residues
Surf - contact surface area (Å2) between two residues
HB   - hydrophilic-hydrophilic contact (hydrogen bond)
Arom - aromatic-aromatic contact
Phob - hydrophobic-hydrophobic contact
DC   - hydrophobic-hydrophilic contact (destabilizing contact)
+/-  - indicates presence/absence of a specific contacts
*    - indicates residues forming contacts  by their side chain
       (including CA atoms)
Residues in contact with LYS 108 (chain D).
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    106D  GLU*     3.1    25.9    -      -       +      +
    107D  LYS*     1.3    77.0    -      -       -      +
    109D  GLN*     1.3    56.3    +      -       -      +
    110D  ASP*     3.6     1.6    -      -       -      -
    111D  VAL*     3.3    22.2    +      -       +      +
    112D  LYS*     2.8    36.5    +      -       -      +
----------------------------------------------------------
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Residues in contact with GLN 109 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    107D  LYS*     3.0    21.5    +      -       -      +
    108D  LYS*     1.3    70.8    -      -       -      +
    110D  ASP*     1.3    67.9    +      -       -      +
    112D  LYS*     3.0    35.5    +      -       -      +
    113D  GLU*     2.8    54.0    +      -       -      +
----------------------------------------------------------
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Residues in contact with ASP 110 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    109D  GLN*     1.3    81.7    +      -       -      +
    111D  VAL*     1.3    67.2    +      -       -      +
    113D  GLU*     3.8    15.5    -      -       +      +
    114D  GLN*     2.9    21.4    +      -       -      +
----------------------------------------------------------
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Residues in contact with VAL 111 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    103D  PRO*     4.9     0.9    -      -       -      +
    106D  GLU*     4.4    12.8    -      -       -      +
    108D  LYS*     3.3    30.6    +      -       +      +
    110D  ASP*     1.3    85.1    -      -       -      +
    112D  LYS*     1.3    59.4    +      -       -      +
    114D  GLN*     3.2    11.2    -      -       +      +
    115D  MET*     3.1    32.2    +      -       +      +
----------------------------------------------------------
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Residues in contact with LYS 112 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    103D  PRO*     3.8    21.2    -      -       -      +
    104D  TRP      5.4     2.5    -      -       -      +
    106D  GLU*     3.0    36.3    +      -       +      +
    107D  LYS*     6.0     0.4    -      -       -      +
    108D  LYS      2.8    18.4    +      -       -      +
    109D  GLN*     3.0    32.1    -      -       -      +
    111D  VAL*     1.3    71.8    -      -       -      +
    113D  GLU*     1.3    74.7    +      -       -      +
    114D  GLN      3.0     1.8    +      -       -      -
    115D  MET      3.2     2.6    +      -       -      -
    116D  PHE*     3.1    45.8    +      -       +      -
    163D  PHE*     6.2     2.5    -      -       -      -
----------------------------------------------------------
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Residues in contact with GLU 113 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    109D  GLN*     2.8    52.6    +      -       -      +
    110D  ASP*     3.8    12.2    +      -       -      +
    112D  LYS*     1.3    87.1    +      -       -      +
    114D  GLN*     1.3    60.3    +      -       -      +
    116D  PHE*     3.5     9.4    -      -       +      +
    117D  ASN*     3.3    37.2    +      -       -      +
----------------------------------------------------------
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Residues in contact with GLN 114 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    110D  ASP      2.9    25.2    +      -       -      +
    111D  VAL*     3.2    16.4    -      -       +      +
    112D  LYS      3.0     1.4    -      -       -      -
    113D  GLU*     1.3    79.1    -      -       -      +
    115D  MET*     1.3    68.3    +      -       +      +
    117D  ASN*     4.1     0.5    -      -       -      +
    118D  GLU*     3.2    50.6    +      -       -      +
----------------------------------------------------------
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Residues in contact with MET 115 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    115C  MET*     6.1     6.3    -      -       +      -
    103D  PRO*     4.0    21.5    -      -       +      -
    111D  VAL*     3.1    18.1    +      -       +      +
    114D  GLN*     1.3    81.8    -      -       +      +
    116D  PHE*     1.3    59.5    +      -       -      +
    118D  GLU*     3.1    29.8    -      -       -      +
    119D  LEU*     2.8    44.5    +      -       +      +
----------------------------------------------------------
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Residues in contact with PHE 116 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    102D  PHE*     3.5    40.4    -      +       +      -
    103D  PRO*     3.5    30.5    -      -       +      +
    104D  TRP*     5.0    16.8    -      +       -      -
    112D  LYS*     3.1    42.9    +      -       +      -
    113D  GLU*     3.5    13.0    -      -       -      +
    114D  GLN      3.3     0.2    -      -       -      -
    115D  MET*     1.3    71.9    -      -       -      +
    117D  ASN*     1.3    60.0    +      -       -      +
    118D  GLU      2.9     2.9    -      -       -      -
    119D  LEU*     2.7    24.6    +      -       -      +
    120D  LEU*     2.8    25.9    +      -       +      +
    163D  PHE*     3.4    47.3    -      +       +      -
    199D  LEU*     6.5     0.2    -      -       +      -
----------------------------------------------------------
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Residues in contact with ASN 117 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    113D  GLU*     3.3    25.0    +      -       -      +
    114D  GLN      4.1     1.3    -      -       -      +
    116D  PHE*     1.3    78.2    -      -       -      +
    118D  GLU*     1.3    56.8    +      -       -      +
    120D  LEU*     3.4    22.7    -      -       +      +
    121D  THR*     2.4    32.0    +      -       -      +
    122D  TYR*     3.6     5.5    -      -       -      -
    163D  PHE*     4.5     7.9    -      -       -      +
----------------------------------------------------------
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Residues in contact with GLU 118 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    114D  GLN*     3.2    42.4    +      -       -      +
    115D  MET*     3.1    34.1    -      -       -      +
    116D  PHE      2.9     0.6    +      -       -      -
    117D  ASN*     1.3    75.8    -      -       -      +
    119D  LEU*     1.3    66.3    +      -       +      +
    122D  TYR*     2.9    38.6    +      -       +      +
    123D  ASN*     4.1     2.3    -      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 119 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     98D  PHE*     3.5     8.6    -      -       +      -
    101D  CYS*     3.3    54.5    -      -       +      +
    102D  PHE*     3.7    26.2    -      -       +      -
    103D  PRO*     4.4     2.5    -      -       +      -
    115D  MET*     2.8    30.9    +      -       +      +
    116D  PHE      2.7     9.1    +      -       -      +
    118D  GLU*     1.3    74.9    -      -       +      +
    120D  LEU*     1.3    56.7    +      -       -      +
    123D  ASN*     2.7    54.4    +      -       +      +
    124D  ALA      3.1     7.1    +      -       -      -
----------------------------------------------------------
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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
----------------------------------------------------------
     98D  PHE*     4.8     0.9    -      -       -      -
    102D  PHE*     3.9    12.1    -      -       +      -
    116D  PHE*     2.8    19.9    +      -       +      +
    117D  ASN*     3.4    28.7    -      -       -      +
    119D  LEU*     1.3    80.0    -      -       -      +
    121D  THR*     1.3    61.1    +      -       -      +
    122D  TYR      3.0     6.1    +      -       -      -
    124D  ALA*     3.1    26.8    -      -       +      +
    125D  PRO*     3.4     1.7    -      -       -      +
    160D  LEU*     3.6    36.3    -      -       +      +
    163D  PHE*     3.3    46.7    -      -       +      +
    164D  LYS*     3.8    17.3    -      -       +      +
----------------------------------------------------------
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Residues in contact with THR 121 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    117D  ASN*     2.4    29.0    +      -       -      +
    118D  GLU      3.6     2.2    +      -       -      -
    120D  LEU*     1.3    75.1    -      -       -      +
    122D  TYR*     1.3    85.9    +      -       +      +
    125D  PRO*     3.5    15.4    -      -       -      +
    164D  LYS*     3.3    28.4    +      -       +      +
----------------------------------------------------------
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Residues in contact with TYR 122 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    117D  ASN      3.6     8.7    -      -       -      -
    118D  GLU*     2.9    25.3    +      -       +      +
    120D  LEU      3.1     0.2    -      -       -      -
    121D  THR*     1.3   106.6    -      -       +      +
    123D  ASN*     1.3    67.9    +      -       -      +
    125D  PRO*     3.6     6.4    -      -       -      +
    126D  HIS*     3.1    28.4    +      -       -      -
----------------------------------------------------------
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Residues in contact with ASN 123 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     98D  PHE*     3.3    20.6    -      -       +      -
    118D  GLU      4.1     3.1    -      -       -      +
    119D  LEU*     2.7    47.6    +      -       -      +
    122D  TYR*     1.3    77.2    -      -       -      +
    124D  ALA*     1.3    62.8    +      -       -      +
    126D  HIS*     3.2    10.9    +      -       -      +
    127D  LEU*     3.1    17.8    +      -       -      +
----------------------------------------------------------
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Residues in contact with ALA 124 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     98D  PHE*     3.7    15.3    -      -       +      -
    119D  LEU      3.1     5.1    +      -       -      -
    120D  LEU*     3.1    22.7    -      -       +      +
    123D  ASN*     1.3    72.9    -      -       -      +
    125D  PRO*     1.3    68.5    -      -       +      +
    127D  LEU*     2.8     4.0    +      -       -      -
    128D  MET*     2.7    38.5    +      -       +      +
    160D  LEU*     5.7     3.1    -      -       +      -
    164D  LYS*     4.9     2.7    -      -       +      -
    167D  LEU*     3.8    24.0    -      -       +      -
----------------------------------------------------------
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Residues in contact with PRO 125 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    120D  LEU      3.4    14.8    -      -       -      +
    121D  THR*     3.5    17.3    -      -       -      +
    122D  TYR*     3.6     9.0    -      -       -      +
    123D  ASN      3.5     3.8    -      -       -      -
    124D  ALA*     1.3    88.6    -      -       +      +
    126D  HIS*     1.3    64.8    +      -       +      +
    128D  MET*     3.9     6.0    -      -       +      +
    129D  GLN*     2.9    31.5    +      -       -      +
    164D  LYS*     4.9     9.9    -      -       -      +
    167D  LEU*     5.3     0.6    -      -       +      -
    171D  HIS*     4.5     3.9    +      -       -      +
----------------------------------------------------------
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Residues in contact with HIS 126 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    122D  TYR      3.1    27.0    +      -       -      -
    123D  ASN*     3.2     6.8    +      -       -      +
    124D  ALA      3.1     0.6    -      -       -      -
    125D  PRO*     1.3    80.8    -      -       +      +
    127D  LEU*     1.3    64.7    +      -       -      +
    129D  GLN*     3.5     4.3    +      -       -      +
    130D  ASP*     2.8    39.6    +      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 127 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     48C  PHE*     4.9     4.3    -      -       +      -
     94D  THR*     3.8    25.4    -      -       +      +
     95D  LEU*     5.4     8.5    -      -       +      -
     98D  PHE*     3.6    40.2    -      -       +      -
    123D  ASN      3.1    11.7    +      -       -      +
    124D  ALA*     2.8     9.4    +      -       -      +
    126D  HIS*     1.3    74.9    -      -       -      +
    128D  MET*     1.3    84.4    +      -       +      +
    130D  ASP*     2.8    18.3    +      -       -      +
    131D  LEU*     2.9    38.7    +      -       +      +
    160D  LEU*     5.3     2.5    -      -       +      -
----------------------------------------------------------
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Residues in contact with MET 128 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    124D  ALA*     2.7    29.8    +      -       +      +
    125D  PRO*     3.9     2.5    -      -       +      +
    127D  LEU*     1.3    98.4    -      -       +      +
    129D  GLN*     1.3    64.6    +      -       -      +
    131D  LEU*     3.0    19.6    +      -       +      +
    132D  ASP*     2.9    20.6    +      -       -      +
    153D  TRP*     3.9     9.0    -      -       +      -
    160D  LEU*     4.4    13.5    -      -       +      -
    167D  LEU*     3.1    42.2    -      -       +      +
    168D  LEU*     3.8    18.6    -      -       +      -
    171D  HIS*     3.3    22.4    -      -       +      +
    174D  LEU*     3.3     8.0    -      -       +      +
----------------------------------------------------------
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Residues in contact with GLN 129 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    125D  PRO      2.9    19.7    +      -       -      +
    126D  HIS*     3.8     6.7    -      -       -      +
    127D  LEU      3.1     0.2    -      -       -      -
    128D  MET*     1.3    78.9    -      -       -      +
    130D  ASP*     1.3    62.8    +      -       -      +
    132D  ASP*     3.3     7.1    -      -       -      +
    133D  THR*     2.9    35.3    +      -       -      +
    171D  HIS*     3.5    28.0    +      -       +      -
----------------------------------------------------------
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Residues in contact with ASP 130 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     47C  PRO      3.2    27.5    -      -       -      +
     48C  PHE*     4.1    25.8    -      -       +      +
    126D  HIS*     2.8    26.1    -      -       -      +
    127D  LEU*     2.8    12.9    +      -       +      +
    129D  GLN*     1.3    79.3    -      -       -      +
    131D  LEU*     1.3    56.9    +      -       -      +
    133D  THR*     3.8     6.1    -      -       -      -
    134D  TYR*     2.7    35.5    +      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 131 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     48C  PHE*     3.3    26.5    -      -       +      -
     91D  ILE*     5.4     4.0    -      -       +      -
     94D  THR*     4.7     3.4    -      -       +      -
     95D  LEU*     4.5    13.2    -      -       +      -
    127D  LEU*     2.9    40.1    +      -       +      +
    128D  MET*     3.3    20.9    -      -       +      +
    130D  ASP*     1.3    76.9    -      -       -      +
    132D  ASP*     1.3    53.9    +      -       -      +
    134D  TYR*     3.1     6.7    +      -       -      +
    135D  LEU*     2.7    37.8    +      -       -      +
    141D  LEU*     5.0     9.3    -      -       +      +
    153D  TRP*     3.7    31.6    -      -       +      -
    174D  LEU*     3.8    14.8    -      -       +      -
----------------------------------------------------------
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Residues in contact with ASP 132 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    128D  MET      2.9    11.7    +      -       -      +
    129D  GLN*     3.3    17.7    -      -       -      +
    131D  LEU*     1.3    77.9    -      -       -      +
    133D  THR*     1.3    58.7    +      -       -      +
    135D  LEU*     3.3     3.5    +      -       -      +
    136D  GLY      3.0    23.9    +      -       -      -
    170D  ASN      4.5     0.3    -      -       -      +
    171D  HIS*     3.0    44.2    +      -       -      +
    172D  PRO*     4.6     1.7    -      -       -      +
    173D  ARG*     2.6    46.7    +      -       -      +
    174D  LEU*     3.8    15.6    +      -       +      +
----------------------------------------------------------
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Residues in contact with THR 133 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     47C  PRO*     6.1     4.5    -      -       +      +
    129D  GLN*     2.9    28.4    +      -       -      +
    130D  ASP*     3.8     7.2    -      -       -      -
    132D  ASP*     1.3    76.8    -      -       -      +
    134D  TYR*     1.3    67.4    +      -       -      +
    136D  GLY*     3.6     9.8    +      -       -      +
    173D  ARG*     4.9     4.0    -      -       -      +
----------------------------------------------------------
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Residues in contact with TYR 134 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     47C  PRO*     5.0    11.7    -      -       +      -
     48C  PHE*     3.7    28.9    -      +       +      -
     62C  HIS*     5.2     4.9    +      +       -      -
     87D  HIS*     3.9    34.7    +      +       -      +
     91D  ILE*     3.6    31.8    -      -       +      +
    130D  ASP      2.7    22.4    +      -       -      +
    131D  LEU*     3.4     3.8    -      -       -      +
    133D  THR*     1.3    76.4    -      -       -      +
    135D  LEU*     1.3    66.0    +      -       -      +
    136D  GLY*     4.2     0.7    -      -       -      -
    138D  ARG*     3.5    18.7    +      -       -      -
    141D  LEU*     3.4    36.3    +      -       +      -
    142D  ILE*     4.5     1.4    -      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 135 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    131D  LEU      2.7    21.0    +      -       -      +
    132D  ASP*     3.3     4.7    +      -       -      +
    134D  TYR*     1.3    75.2    -      -       -      +
    136D  GLY*     1.3    61.0    +      -       -      +
    138D  ARG*     2.8    53.0    +      -       -      +
    139D  GLU      4.9     0.9    -      -       -      +
    140D  TRP*     3.8    26.5    -      -       -      +
    141D  LEU*     3.9    12.8    -      -       +      -
    173D  ARG*     3.4    39.0    -      -       +      +
    174D  LEU*     4.2     7.9    -      -       +      -
    177D  LEU*     3.9    31.4    -      -       +      -
----------------------------------------------------------
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Residues in contact with GLY 136 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    132D  ASP      3.0    13.9    +      -       -      -
    133D  THR*     4.0     8.3    -      -       -      -
    134D  TYR      3.3     2.5    +      -       -      -
    135D  LEU*     1.3    79.4    -      -       -      +
    137D  GLY*     1.3    59.9    +      -       -      -
    138D  ARG*     4.7     1.2    -      -       -      +
    173D  ARG*     2.7    38.1    +      -       -      -
----------------------------------------------------------
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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