Contacts of the helix formed by residues 128 - 154 (chain D) in PDB entry 6K71


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 GLN 128 (chain D).
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     92D  GLU*     4.6     7.5    +      -       -      +
     95D  ARG*     5.6     0.8    -      -       -      +
     96D  LEU*     3.3    39.2    -      -       +      +
    126D  TYR      3.8     0.4    -      -       -      -
    127D  ALA*     1.3    77.1    -      -       +      +
    129D  LEU*     1.3    61.5    +      -       -      +
    130D  GLN      3.8     0.2    -      -       -      -
    131D  SER*     3.0    16.3    +      -       -      +
    132D  ASN*     2.3    53.8    +      -       -      +
     53K  ARG*     3.4    15.1    +      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 129 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     51D  TRP*     4.0    30.3    -      -       +      +
     54D  ALA*     5.1    15.3    -      -       +      -
     57D  LEU*     5.6     5.4    -      -       +      -
     89D  ILE*     4.6     6.5    -      -       +      +
     92D  GLU*     3.8    13.7    -      -       +      +
     93D  TYR*     4.2    32.8    -      -       +      +
     96D  LEU*     5.0     6.3    -      -       +      -
    125D  HIS      5.0     9.4    -      -       -      +
    126D  TYR      4.0    13.5    -      -       -      +
    127D  ALA      3.0     4.2    +      -       -      -
    128D  GLN*     1.3    83.6    -      -       -      +
    130D  GLN*     1.3    66.3    +      -       +      +
    132D  ASN*     3.1     8.9    +      -       -      +
    133D  ILE*     3.0    37.6    +      -       +      +
----------------------------------------------------------
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Residues in contact with GLN 130 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     46D  ILE*     3.7    28.2    +      -       +      +
     47D  THR*     5.8     0.8    -      -       -      +
     50D  ARG*     3.8    27.5    +      -       -      +
     51D  TRP*     4.6     7.9    -      -       +      -
    127D  ALA      4.6     2.4    +      -       -      +
    129D  LEU*     1.3    77.9    -      -       -      +
    131D  SER*     1.3    65.9    +      -       -      +
    133D  ILE*     3.3    11.8    +      -       -      +
    134D  ILE*     3.0    56.7    +      -       -      +
----------------------------------------------------------
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Residues in contact with SER 131 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    128D  GLN*     3.0    21.3    +      -       -      +
    130D  GLN*     1.3    83.9    +      -       -      +
    132D  ASN*     1.3    68.0    +      -       -      -
    134D  ILE*     3.3     5.7    +      -       -      +
    135D  GLU*     3.0    28.2    +      -       -      +
     91K  SER*     3.3    33.2    -      -       -      +
     92K  PRO*     5.2     2.5    -      -       -      -
----------------------------------------------------------
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Residues in contact with ASN 132 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     92D  GLU*     3.2    30.4    -      -       -      +
    128D  GLN*     2.3    44.4    +      -       -      +
    129D  LEU*     3.1     5.2    +      -       -      +
    131D  SER*     1.3    82.6    +      -       -      +
    133D  ILE*     1.3    59.9    +      -       -      +
    135D  GLU*     3.6    15.9    -      -       -      +
    136D  ALA*     3.0    23.9    +      -       -      +
     53K  ARG*     2.9    35.6    +      -       -      +
     54K  ARG*     5.4     0.2    -      -       -      +
     87K  LYS*     5.8     0.7    +      -       -      -
     91K  SER*     4.7    11.8    +      -       -      -
----------------------------------------------------------
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Residues in contact with ILE 133 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     46D  ILE*     3.8    25.8    -      -       +      -
     51D  TRP*     5.3     4.0    -      -       +      -
     57D  LEU*     5.6     3.6    -      -       +      -
     85D  VAL*     5.1     2.9    -      -       +      -
     88D  ILE*     5.4     2.0    -      -       +      -
     89D  ILE*     3.7    34.1    -      -       +      -
     92D  GLU*     3.6    15.3    -      -       -      +
    129D  LEU*     3.0    39.6    +      -       +      +
    130D  GLN*     3.3    16.2    -      -       +      +
    132D  ASN*     1.3    76.4    -      -       -      +
    134D  ILE*     1.3    58.7    +      -       +      +
    136D  ALA*     3.1     6.9    +      -       -      +
    137D  ILE*     2.9    47.1    +      -       +      +
----------------------------------------------------------
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Residues in contact with ILE 134 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     43D  ARG*     3.7    32.3    -      -       +      +
     46D  ILE*     3.9    20.0    -      -       +      -
    130D  GLN*     3.0    36.3    +      -       -      +
    131D  SER*     4.0     4.0    -      -       -      +
    133D  ILE*     1.3    77.8    -      -       +      +
    135D  GLU*     1.3    57.7    +      -       -      +
    137D  ILE*     3.3    12.9    +      -       +      +
    138D  ASN*     2.9    27.4    +      -       +      +
----------------------------------------------------------
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Residues in contact with GLU 135 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    131D  SER      3.0    17.7    +      -       -      +
    132D  ASN*     3.6    17.2    -      -       -      +
    133D  ILE      3.2     0.2    -      -       -      -
    134D  ILE*     1.3    76.8    -      -       -      +
    136D  ALA*     1.3    62.9    +      -       -      +
    138D  ASN*     3.1     9.9    +      -       +      +
    139D  GLU*     3.0    23.8    +      -       -      +
     51K  LEU      4.9     1.6    -      -       -      +
     52K  SER*     4.1    16.4    -      -       -      -
     53K  ARG*     4.8     7.0    +      -       -      +
     54K  ARG*     3.7    17.4    +      -       -      -
     87K  LYS*     3.1    43.5    +      -       -      +
     90K  VAL      4.8     7.9    -      -       -      +
     91K  SER*     6.1     1.3    -      -       -      +
----------------------------------------------------------
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Residues in contact with ALA 136 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     88D  ILE*     4.1    15.5    -      -       +      -
     92D  GLU*     4.0     1.6    -      -       -      +
    132D  ASN      3.0    12.2    +      -       -      +
    133D  ILE*     3.4     8.5    -      -       -      +
    135D  GLU*     1.3    74.4    +      -       -      +
    137D  ILE*     1.3    65.2    +      -       -      +
    139D  GLU*     3.2    11.2    +      -       -      +
    140D  LEU*     3.0    27.4    +      -       +      +
     54K  ARG*     3.4    35.9    -      -       -      +
----------------------------------------------------------
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Residues in contact with ILE 137 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     39D  LEU*     5.3     3.1    -      -       +      +
     42D  LEU      5.7     1.6    -      -       -      +
     43D  ARG*     3.6    36.1    -      -       +      -
     85D  VAL*     4.2    15.5    -      -       +      -
     88D  ILE*     4.1    17.3    -      -       +      -
    133D  ILE*     2.9    43.2    +      -       +      +
    134D  ILE*     3.6    17.7    -      -       +      +
    136D  ALA*     1.3    75.8    -      -       -      +
    138D  ASN*     1.3    59.0    +      -       -      +
    140D  LEU*     3.3    19.4    +      -       +      +
    141D  LEU*     2.9    42.4    +      -       +      +
----------------------------------------------------------
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Residues in contact with ASN 138 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    134D  ILE*     2.9    13.9    +      -       +      +
    135D  GLU*     3.1    13.0    +      -       +      +
    137D  ILE*     1.3    76.2    -      -       -      +
    139D  GLU*     1.3    63.4    +      -       -      +
    141D  LEU*     3.3    26.3    +      -       -      +
    142D  VAL*     3.0    31.9    +      -       -      +
----------------------------------------------------------
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Residues in contact with GLU 139 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    135D  GLU*     3.0    16.5    +      -       -      +
    136D  ALA*     3.3    13.5    -      -       -      +
    138D  ASN*     1.3    75.4    -      -       -      +
    140D  LEU*     1.3    64.4    +      -       +      +
    142D  VAL*     3.2     7.1    +      -       -      +
    143D  GLU*     3.1    18.9    +      -       -      +
     51K  LEU      3.4    20.7    -      -       -      +
     52K  SER*     4.9     3.4    -      -       -      -
     56K  ILE*     3.6    27.1    -      -       +      +
     61K  LYS*     3.0    28.0    +      -       -      +
     62K  LEU*     3.2    34.6    -      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 140 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     39D  LEU*     3.7    24.2    -      -       +      -
     81D  MET*     6.5     0.7    -      -       +      -
     84D  ARG*     4.6    24.2    -      -       +      +
     88D  ILE*     4.4    18.4    -      -       +      -
    136D  ALA*     3.0    26.2    +      -       +      +
    137D  ILE*     3.4    24.2    -      -       +      +
    139D  GLU*     1.3    79.2    -      -       +      +
    141D  LEU*     1.3    56.6    +      -       -      +
    143D  GLU*     3.2    19.1    +      -       -      +
    144D  LEU*     3.0    27.7    +      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 141 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     39D  LEU*     3.6    22.7    -      -       +      -
     43D  ARG*     3.7    31.2    -      -       -      +
    137D  ILE*     2.9    41.2    +      -       +      +
    138D  ASN*     3.4    28.7    -      -       -      +
    139D  GLU      3.2     0.2    -      -       -      -
    140D  LEU*     1.3    75.5    -      -       -      +
    142D  VAL*     1.3    68.1    +      -       +      +
    144D  LEU*     3.2    23.7    -      -       +      +
    145D  GLU*     3.3    10.9    -      -       -      +
----------------------------------------------------------
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Residues in contact with VAL 142 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    138D  ASN*     3.0    29.5    +      -       -      +
    139D  GLU*     3.7     6.5    -      -       -      +
    141D  LEU*     1.3    82.5    -      -       +      +
    143D  GLU*     1.3    62.3    +      -       -      +
    145D  GLU*     2.9    31.7    -      -       -      +
    146D  GLY*     3.0    10.0    +      -       -      -
     61K  LYS      3.8     2.7    -      -       -      +
     62K  LEU*     3.3    43.1    -      -       +      +
     67K  ARG*     4.6     6.5    +      -       -      +
----------------------------------------------------------
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Residues in contact with GLU 143 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    139D  GLU*     3.1    12.5    +      -       -      +
    140D  LEU*     3.2    21.6    +      -       -      +
    142D  VAL*     1.3    77.4    -      -       -      +
    144D  LEU*     1.3    60.5    +      -       -      +
    146D  GLY*     2.9    17.0    +      -       -      -
    147D  THR*     3.2    16.2    +      -       +      +
    150D  ASN*     5.3     0.3    +      -       -      -
    271D  MET*     3.3    36.3    -      -       -      +
    327D  ASN*     5.1     5.3    -      -       +      +
     61K  LYS*     3.4    53.4    +      -       +      +
----------------------------------------------------------
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Residues in contact with LEU 144 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     32D  GLU*     4.3     9.3    -      -       +      +
     35D  ALA*     3.6    39.7    -      -       +      +
     36D  ARG*     4.1    10.1    -      -       +      +
     39D  LEU*     3.7    30.5    -      -       +      -
     81D  MET*     4.6     6.7    -      -       +      -
    140D  LEU      3.0    11.1    +      -       -      +
    141D  LEU*     3.2    38.1    -      -       +      +
    142D  VAL      3.4     0.6    -      -       -      -
    143D  GLU*     1.3    76.5    -      -       +      +
    145D  GLU*     1.3    61.5    +      -       +      +
    147D  THR*     2.9    29.3    +      -       +      +
    272D  PHE*     5.0    15.6    -      -       +      -
----------------------------------------------------------
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Residues in contact with GLU 145 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     32D  GLU*     5.8     1.8    -      -       -      -
     36D  ARG*     3.8    29.8    -      -       -      +
    141D  LEU      3.3    15.0    -      -       -      +
    142D  VAL*     2.9    29.4    -      -       -      +
    144D  LEU*     1.3    79.7    -      -       +      +
    146D  GLY*     1.3    61.4    +      -       -      +
    147D  THR*     3.2     3.7    +      -       -      -
    148D  MET*     4.5     0.7    +      -       -      +
    149D  GLU*     2.8    19.4    -      -       -      +
     67K  ARG*     2.4    49.5    +      -       -      -
----------------------------------------------------------
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Residues in contact with GLY 146 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    142D  VAL      3.0    11.1    +      -       -      -
    143D  GLU      2.9     8.8    +      -       -      -
    145D  GLU*     1.3    81.4    -      -       -      +
    147D  THR*     1.3    58.5    +      -       -      +
    148D  MET      3.5     0.4    -      -       -      -
    149D  GLU*     3.5    11.6    +      -       -      +
    150D  ASN*     2.8    37.2    +      -       -      -
     60K  ASN      5.3     1.5    -      -       -      +
     61K  LYS      4.9     7.2    -      -       -      -
     67K  ARG*     4.6     8.7    -      -       -      -
----------------------------------------------------------
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Residues in contact with THR 147 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     32D  GLU*     3.3    16.5    +      -       -      -
    143D  GLU*     3.2    15.1    +      -       +      +
    144D  LEU*     2.9    29.8    +      -       -      +
    145D  GLU      4.3     1.4    +      -       -      -
    146D  GLY*     1.3    76.4    -      -       -      +
    148D  MET*     1.3    74.3    +      -       -      +
    150D  ASN*     3.0     4.3    +      -       -      +
    151D  ILE*     3.0    25.1    +      -       -      +
    270D  PRO*     4.4     0.7    -      -       -      -
    271D  MET*     5.2     1.8    -      -       +      +
    272D  PHE*     4.4    14.7    -      -       +      +
    327D  ASN*     3.2    38.6    -      -       +      +
----------------------------------------------------------
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Residues in contact with MET 148 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     32D  GLU*     3.3    36.1    -      -       +      +
    145D  GLU      4.5     1.0    +      -       -      +
    146D  GLY      3.5     0.4    -      -       -      -
    147D  THR*     1.3    97.3    +      -       -      +
    149D  GLU*     1.3    65.5    +      -       -      +
    151D  ILE*     4.2     4.7    -      -       +      +
    152D  ALA*     2.9    31.0    +      -       -      +
    172D  ARG*     4.9     4.5    -      -       +      +
    173D  THR*     3.0    50.3    -      -       +      +
    176D  ALA*     4.6     9.7    -      -       +      +
    270D  PRO*     3.7    26.7    -      -       +      -
    272D  PHE*     4.8     0.9    -      -       +      -
----------------------------------------------------------
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Residues in contact with GLU 149 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    145D  GLU*     2.8    25.8    -      -       -      +
    146D  GLY*     3.6     9.0    -      -       -      +
    148D  MET*     1.3    79.2    +      -       -      +
    150D  ASN*     1.3    59.1    +      -       -      +
    152D  ALA*     3.4     5.8    +      -       -      +
    153D  ALA*     2.9    31.8    +      -       -      +
     64K  ARG*     2.5    46.5    +      -       +      +
     65K  ILE*     6.6     0.2    -      -       +      -
     67K  ARG*     4.3     7.9    +      -       -      +
----------------------------------------------------------
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Residues in contact with ASN 150 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    143D  GLU      5.3     0.6    +      -       -      -
    146D  GLY      2.8    25.5    +      -       -      -
    147D  THR*     3.0     2.9    +      -       -      +
    149D  GLU*     1.3    77.7    -      -       -      +
    151D  ILE*     1.3    60.2    +      -       +      +
    153D  ALA*     3.3     4.4    +      -       -      +
    154D  GLN*     3.0    43.2    +      -       -      +
    327D  ASN*     3.3    27.8    +      -       -      +
     60K  ASN*     3.6    27.5    +      -       -      +
     61K  LYS*     4.0    23.0    -      -       -      +
----------------------------------------------------------
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Residues in contact with ILE 151 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    147D  THR      3.0    16.6    +      -       -      +
    148D  MET*     4.2     8.1    -      -       +      +
    150D  ASN*     1.3    75.5    -      -       -      +
    152D  ALA*     1.3    64.6    +      -       -      +
    154D  GLN*     3.7    11.2    +      -       -      +
    155D  ALA*     3.7    12.0    -      -       -      +
    173D  THR*     3.7    35.9    -      -       +      +
    176D  ALA*     5.4     1.6    -      -       +      -
    177D  PHE*     4.3    10.6    -      -       +      -
    268D  CYS*     5.1     3.4    -      -       -      -
    270D  PRO*     5.4     3.6    -      -       +      -
    325D  ILE*     3.3    43.0    -      -       +      +
    326D  SER*     3.6    17.9    -      -       -      +
    327D  ASN*     3.4    23.1    -      -       -      +
----------------------------------------------------------
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Residues in contact with ALA 152 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    148D  MET      2.9    19.5    +      -       -      +
    149D  GLU*     3.7     7.0    -      -       -      +
    151D  ILE*     1.3    80.0    -      -       -      +
    153D  ALA*     1.3    57.3    +      -       -      +
    155D  ALA*     3.3     7.9    -      -       -      +
    176D  ALA*     4.2    26.8    -      -       +      +
    180D  GLU*     3.1    38.3    -      -       -      +
----------------------------------------------------------
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Residues in contact with ALA 153 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    149D  GLU      2.9    19.4    +      -       -      +
    150D  ASN*     3.7     5.2    -      -       -      +
    152D  ALA*     1.3    75.2    -      -       -      +
    154D  GLN*     1.3    59.4    +      -       +      +
    155D  ALA      3.3     5.8    +      -       -      -
    156D  LEU      5.2     0.3    +      -       -      -
    180D  GLU*     4.8     5.6    -      -       -      -
----------------------------------------------------------
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Residues in contact with GLN 154 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    150D  ASN*     3.0    26.9    +      -       -      +
    151D  ILE*     3.7     6.4    +      -       -      +
    152D  ALA      3.3     0.8    -      -       -      -
    153D  ALA*     1.3    80.5    -      -       -      +
    155D  ALA*     1.3    55.2    +      -       -      -
    156D  LEU      3.7     2.4    +      -       -      -
    157D  GLU*     4.8    14.5    +      -       -      +
    158D  HIS*     4.2    11.3    +      -       -      -
    177D  PHE*     4.2     8.0    -      -       -      -
    325D  ILE*     4.2    22.5    -      -       +      +
    326D  SER      3.3    25.6    +      -       -      +
    327D  ASN*     5.6     1.2    -      -       -      +
    328D  ILE      4.8     2.6    +      -       -      -
    329D  GLY*     4.1    18.7    -      -       -      +
----------------------------------------------------------
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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