Contacts of the helix formed by residues 136 - 160 (chain E) in PDB entry 1O9I


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 ASN 136 (chain E).
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    262B  HIS*     2.8    26.4    +      -       -      +
    264B  HIS*     3.7    26.2    +      -       -      +
    153D  LEU*     3.7    29.5    -      -       +      +
    157D  ARG*     4.7     0.4    -      -       -      +
    134E  SER*     3.0     4.6    +      -       -      -
    135E  GLY*     1.3    76.8    -      -       -      +
    137E  LEU*     1.3    59.4    +      -       -      +
    138E  VAL*     2.9    23.5    +      -       -      +
    139E  ALA*     2.9    15.3    +      -       +      +
    140E  ASP*     2.9    29.5    +      -       -      -
----------------------------------------------------------
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Residues in contact with LEU 137 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    264B  HIS      2.8    13.2    +      -       -      +
    265B  GLN*     3.8    38.6    -      -       +      +
     45E  GLN*     4.3    11.0    -      -       +      +
     49E  SER*     4.1    12.6    -      -       -      +
     55E  TYR*     4.2    22.7    -      -       +      -
     59E  LEU*     4.1    25.1    -      -       +      -
    135E  GLY*     4.0     2.2    +      -       -      +
    136E  ASN*     1.3    72.7    -      -       -      +
    138E  VAL*     1.3    61.7    +      -       -      +
    139E  ALA      3.3     0.4    -      -       -      -
    140E  ASP*     3.6    22.2    -      -       +      +
    141E  MET*     2.8    41.9    +      -       +      +
----------------------------------------------------------
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Residues in contact with VAL 138 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    264B  HIS*     3.8    21.9    +      -       +      +
    136E  ASN*     2.9    11.7    +      -       -      +
    137E  LEU*     1.3    79.7    -      -       -      +
    139E  ALA*     1.3    62.5    +      -       -      +
    141E  MET*     4.2     2.1    -      -       -      +
    142E  ARG*     3.3    49.3    +      -       -      +
----------------------------------------------------------
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Residues in contact with ALA 139 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    146D  VAL*     4.6     2.6    -      -       -      +
    149D  SER*     4.3    27.4    -      -       -      +
    150D  GLU*     3.4    28.4    -      -       +      +
    153D  LEU*     4.8     3.6    -      -       +      -
    134E  SER*     4.4     1.8    -      -       -      +
    136E  ASN*     2.9    21.9    +      -       +      +
    138E  VAL*     1.3    77.8    -      -       -      +
    140E  ASP*     1.3    59.0    +      -       -      +
    142E  ARG*     3.2     8.0    +      -       -      +
    143E  PHE*     3.0    22.2    +      -       -      +
----------------------------------------------------------
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Residues in contact with ASP 140 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    150D  GLU*     2.8    17.2    -      -       -      +
     45E  GLN*     3.7    28.2    -      -       -      +
    132E  THR*     3.7     5.0    -      -       -      +
    133E  SER*     3.4     7.4    +      -       -      -
    134E  SER*     2.7    42.0    +      -       -      -
    135E  GLY      3.9     3.8    +      -       -      -
    136E  ASN      2.9    18.2    +      -       -      +
    137E  LEU*     3.6    11.2    +      -       +      +
    139E  ALA*     1.3    74.3    -      -       -      +
    141E  MET*     1.3    60.3    -      -       -      +
    143E  PHE*     3.2     6.8    +      -       -      +
    144E  ASN*     2.8    36.0    +      -       -      +
----------------------------------------------------------
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Residues in contact with MET 141 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     55E  TYR*     4.0    28.3    -      -       +      -
     58E  LEU*     4.4    13.7    -      -       +      -
     59E  LEU*     3.9    31.4    -      -       +      -
    137E  LEU*     2.8    31.9    +      -       +      +
    138E  VAL*     4.2     2.7    -      -       -      +
    140E  ASP*     1.3    73.1    -      -       -      +
    142E  ARG*     1.3    66.5    +      -       -      +
    144E  ASN*     3.2     9.0    +      -       -      +
    145E  VAL*     3.0    28.8    +      -       -      +
    185E  PHE*     3.6    43.1    -      -       -      +
----------------------------------------------------------
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Residues in contact with ARG 142 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    142D  ARG*     5.5     0.4    -      -       -      +
    145D  VAL*     3.8    12.8    -      -       +      +
    146D  VAL*     3.3    14.6    -      -       +      -
    149D  SER*     2.9    38.6    +      -       -      -
    182D  GLN*     3.2    18.0    +      -       -      -
    186D  MET*     3.4    28.3    -      -       -      +
    138E  VAL*     3.3    35.7    +      -       +      +
    139E  ALA      3.2     7.5    +      -       -      +
    141E  MET*     1.3    77.7    -      -       -      +
    143E  PHE*     1.3    63.9    +      -       -      +
    145E  VAL*     3.2    10.0    +      -       -      +
    146E  VAL*     3.0    24.3    +      -       -      +
----------------------------------------------------------
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Residues in contact with PHE 143 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     33D  TRP*     3.9    18.8    -      +       -      -
    146D  VAL*     3.3    19.4    -      -       +      +
    150D  GLU*     4.5     4.5    -      -       -      +
     33E  TRP*     3.7    33.0    -      +       -      -
     37E  THR*     4.7     0.7    -      -       +      -
     41E  SER*     3.6    25.8    -      -       -      -
     45E  GLN*     4.0     3.8    -      -       -      -
    130E  TYR      3.8    21.3    -      -       -      -
    132E  THR*     3.7    32.5    -      -       +      -
    139E  ALA      3.0    13.5    +      -       -      +
    140E  ASP*     3.3    11.0    -      -       -      +
    142E  ARG*     1.3    76.2    -      -       -      +
    144E  ASN*     1.3    71.9    +      -       -      +
    146E  VAL*     3.0     5.2    +      -       +      +
    147E  ARG*     2.8    36.2    +      -       +      +
----------------------------------------------------------
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Residues in contact with ASN 144 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     42E  PHE*     3.2    26.8    -      -       +      -
     45E  GLN*     2.8    41.8    +      -       -      -
     59E  LEU*     3.4    17.8    -      -       -      +
    140E  ASP      2.8    20.2    +      -       -      +
    141E  MET*     3.2    17.6    +      -       -      +
    143E  PHE*     1.3    76.0    -      -       -      +
    145E  VAL*     1.3    66.6    +      -       -      +
    147E  ARG*     3.2     2.5    +      -       -      +
    148E  GLU*     3.0    28.8    +      -       -      +
    185E  PHE*     3.7    18.7    -      -       +      -
----------------------------------------------------------
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Residues in contact with VAL 145 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    142D  ARG*     3.8    35.7    -      -       +      +
    189D  GLN*     6.1     0.7    -      -       -      +
    141E  MET      3.0    20.2    +      -       -      +
    142E  ARG*     3.2     9.8    +      -       -      +
    144E  ASN*     1.3    78.3    -      -       -      +
    146E  VAL*     1.3    53.0    +      -       -      +
    148E  GLU*     3.3     6.5    +      -       -      +
    149E  SER*     2.7    36.1    +      -       -      +
    182E  GLN*     4.0    16.1    -      -       +      +
    185E  PHE*     3.6    31.6    -      -       +      +
----------------------------------------------------------
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Residues in contact with VAL 146 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    139D  ALA      4.7     1.3    -      -       -      +
    142D  ARG*     3.4    43.3    -      -       +      +
    143D  PHE*     3.4    17.5    -      -       +      +
    146D  VAL*     3.6     8.3    -      -       +      -
     33E  TRP*     3.7    26.5    -      -       +      -
    142E  ARG      3.0    17.8    +      -       -      +
    143E  PHE*     3.0     9.8    +      -       +      +
    145E  VAL*     1.3    74.6    -      -       -      +
    147E  ARG*     1.3    66.1    +      -       -      +
    149E  SER*     4.1     5.4    -      -       -      -
    150E  GLU*     2.9    36.1    +      -       +      +
----------------------------------------------------------
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Residues in contact with ARG 147 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     33E  TRP*     2.8    63.5    +      -       +      -
     34E  GLY      3.0    16.9    +      -       -      -
     35E  GLU*     3.1    17.8    +      -       -      -
     37E  THR*     4.1    12.8    -      -       +      +
     38E  GLY*     3.6    18.1    -      -       -      +
     42E  PHE*     4.2     5.7    -      -       +      -
     66E  GLU*     3.2    24.9    +      -       -      -
    143E  PHE*     2.8    24.6    +      -       +      +
    144E  ASN*     3.2    12.1    +      -       -      +
    146E  VAL*     1.3    72.0    -      -       -      +
    148E  GLU*     1.3    85.9    +      -       -      +
    150E  GLU*     3.9     1.2    -      -       -      +
    151E  ALA*     3.0    35.2    +      -       -      +
    178E  GLU*     5.6     0.8    +      -       -      +
----------------------------------------------------------
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Residues in contact with GLU 148 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     42E  PHE*     3.3    15.2    -      -       +      -
     66E  GLU*     2.8    24.4    -      -       -      +
    144E  ASN      3.0    17.4    +      -       -      +
    145E  VAL      3.9     0.7    -      -       -      +
    147E  ARG*     1.3    90.7    +      -       -      +
    149E  SER*     1.3    58.6    +      -       -      +
    151E  ALA*     3.9     3.7    -      -       -      +
    152E  ARG*     3.0    23.6    +      -       -      +
    178E  GLU*     3.4    28.3    -      -       -      +
    181E  HIS*     3.3    35.7    +      -       +      +
    182E  GLN*     3.2    31.2    +      -       +      +
    185E  PHE*     5.4     1.6    -      -       +      -
----------------------------------------------------------
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Residues in contact with SER 149 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    139D  ALA*     4.3    12.1    -      -       -      -
    142D  ARG*     2.9    28.6    +      -       -      -
    200D  VAL*     3.5    23.7    -      -       -      +
    145E  VAL      2.7    22.3    +      -       -      -
    146E  VAL*     3.1     8.0    +      -       -      -
    148E  GLU*     1.3    76.6    -      -       -      +
    150E  GLU*     1.3    60.4    +      -       -      +
    152E  ARG*     3.4     0.7    +      -       -      -
    153E  LEU*     3.0    29.3    +      -       -      +
    182E  GLN*     3.5    11.5    -      -       -      +
----------------------------------------------------------
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Residues in contact with GLU 150 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    132D  THR*     3.4    15.2    -      -       -      +
    134D  SER*     3.2    24.8    +      -       -      -
    139D  ALA*     3.4    21.8    -      -       +      +
    140D  ASP*     2.8    22.5    -      -       -      +
    143D  PHE*     4.4     2.6    -      -       -      +
     33E  TRP*     3.5    41.7    +      -       +      +
    146E  VAL*     2.9    23.3    +      -       +      +
    149E  SER*     1.3    76.5    -      -       -      +
    151E  ALA*     1.3    63.3    +      -       -      +
    153E  LEU*     3.4     7.4    +      -       -      +
    154E  GLN*     3.0    32.0    +      -       -      +
----------------------------------------------------------
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Residues in contact with ALA 151 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     33E  TRP*     3.6     9.5    -      -       -      +
     34E  GLY*     5.5     0.2    -      -       -      -
     35E  GLU*     4.4     2.2    -      -       -      +
    147E  ARG*     3.0    44.2    +      -       -      +
    148E  GLU*     4.0     4.0    -      -       -      +
    150E  GLU*     1.3    77.4    -      -       -      +
    152E  ARG*     1.3    57.0    +      -       -      +
    154E  GLN*     3.1     9.5    +      -       -      +
    155E  VAL*     2.9    32.2    +      -       +      +
    178E  GLU*     3.9    16.6    -      -       -      +
----------------------------------------------------------
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Residues in contact with ARG 152 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    199D  ILE*     3.4    12.2    -      -       -      +
    200D  VAL      3.1    19.9    +      -       -      +
    201D  PRO*     2.9    34.0    +      -       -      +
    204D  MET*     3.7    26.9    +      -       -      +
    205D  LYS*     4.5     1.6    -      -       -      +
    208D  GLU*     2.8    26.5    +      -       -      -
    148E  GLU      3.0    20.0    +      -       -      +
    149E  SER      4.0     0.2    -      -       -      +
    150E  GLU      3.3     0.2    -      -       -      -
    151E  ALA*     1.3    76.1    -      -       -      +
    153E  LEU*     1.3    57.6    +      -       -      +
    155E  VAL      3.8     0.2    -      -       -      -
    156E  SER*     2.8    33.3    +      -       -      -
    175E  LEU*     3.0    33.8    +      -       +      +
    178E  GLU*     3.1    25.5    +      -       +      +
    179E  THR*     3.1    10.9    +      -       -      +
    182E  GLN*     3.6    10.3    -      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 153 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    261A  LEU      3.8    10.3    -      -       -      +
    262A  HIS*     3.9    22.0    -      -       +      +
    134D  SER*     3.4    35.2    -      -       -      +
    136D  ASN*     3.7    19.5    -      -       +      +
    139D  ALA*     4.7     2.9    -      -       +      -
    200D  VAL*     4.3     5.2    -      -       +      -
    201D  PRO*     3.8    12.0    -      -       +      +
    149E  SER      3.0    17.0    +      -       -      +
    150E  GLU*     3.5    11.0    -      -       -      +
    151E  ALA      3.2     0.2    -      -       -      -
    152E  ARG*     1.3    76.8    -      -       -      +
    154E  GLN*     1.3    63.8    +      -       +      +
    156E  SER*     3.3     3.5    +      -       -      -
    157E  ARG*     3.0    55.9    +      -       -      +
----------------------------------------------------------
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Residues in contact with GLN 154 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     27E  GLU*     3.5    40.7    +      -       +      +
     28E  SER*     5.1     5.2    +      -       -      +
     32E  GLN*     5.5     1.2    +      -       -      +
     33E  TRP*     4.2    36.1    -      -       -      +
     34E  GLY*     5.3     0.3    -      -       -      -
    150E  GLU*     3.0    20.0    +      -       -      +
    151E  ALA*     3.6     8.6    -      -       -      +
    153E  LEU*     1.3    80.6    -      -       +      +
    155E  VAL*     1.3    57.3    +      -       +      +
    157E  ARG*     3.1    17.8    +      -       -      +
    158E  LEU*     2.8    38.9    +      -       +      +
----------------------------------------------------------
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Residues in contact with VAL 155 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     28E  SER*     4.7    13.9    -      -       -      +
     35E  GLU*     6.0     0.4    -      -       -      +
    151E  ALA*     2.9    20.3    +      -       +      +
    152E  ARG      3.8     1.8    -      -       -      +
    154E  GLN*     1.3    75.5    -      -       +      +
    156E  SER*     1.3    62.6    +      -       -      +
    158E  LEU*     3.2    11.9    +      -       +      +
    159E  TYR*     3.0    21.8    +      -       -      +
    171E  LEU*     3.7    35.9    -      -       +      +
    174E  LEU*     4.4     9.4    -      -       +      -
    175E  LEU*     3.5    21.1    -      -       +      +
    178E  GLU*     3.5    27.1    -      -       -      +
----------------------------------------------------------
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Residues in contact with SER 156 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    262A  HIS*     4.0    16.9    +      -       -      -
    201D  PRO*     3.3    28.1    -      -       -      +
    204D  MET*     3.3    30.7    -      -       -      +
    152E  ARG      2.8    23.3    +      -       -      -
    153E  LEU      3.5     4.9    -      -       -      -
    155E  VAL*     1.3    77.4    -      -       -      +
    157E  ARG*     1.3    62.1    +      -       -      +
    159E  TYR*     3.2    16.3    +      -       -      +
    160E  SER*     3.6     5.7    +      -       -      -
    175E  LEU*     3.5     9.0    -      -       -      +
----------------------------------------------------------
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Residues in contact with ARG 157 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    260A  ARG      4.2    15.0    -      -       -      +
    261A  LEU*     2.8    37.7    +      -       +      +
    262A  HIS*     4.5     1.7    +      -       +      -
    263A  ASN*     2.8    24.9    +      -       -      -
    134D  SER*     2.8    32.9    +      -       -      +
    135D  GLY*     4.3     2.2    -      -       -      -
    153E  LEU*     3.0    44.2    +      -       -      +
    154E  GLN*     3.1    16.9    +      -       -      +
    156E  SER*     1.3    76.6    -      -       -      +
    158E  LEU*     1.3    63.8    +      -       -      +
    160E  SER*     2.9    15.1    +      -       -      -
    161E  MET*     3.2    31.7    -      -       +      +
----------------------------------------------------------
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Residues in contact with LEU 158 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     21E  MET*     3.6    24.1    -      -       +      +
     24E  ARG*     3.7    37.0    -      -       +      +
     25E  LEU*     3.8    17.0    -      -       +      +
     27E  GLU*     5.9     2.2    -      -       +      -
     28E  SER*     3.6    23.8    -      -       -      +
    154E  GLN*     2.8    24.0    +      -       +      +
    155E  VAL*     3.2    15.9    +      -       +      +
    157E  ARG*     1.3    74.9    -      -       -      +
    159E  TYR*     1.3    57.5    +      -       -      +
    161E  MET*     2.9    34.2    +      -       -      +
    162E  THR*     3.6     5.7    +      -       -      +
    171E  LEU*     3.8    11.4    -      -       +      -
----------------------------------------------------------
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Residues in contact with TYR 159 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    204D  MET*     4.4    12.1    -      -       +      -
    207D  ILE*     3.5    45.3    -      -       +      +
    155E  VAL      3.0    11.7    +      -       -      +
    156E  SER      3.3    11.9    -      -       -      +
    157E  ARG      3.1     0.6    -      -       -      -
    158E  LEU*     1.3    77.5    -      -       -      +
    160E  SER*     1.3    63.6    +      -       -      +
    161E  MET      3.2     0.2    -      -       -      -
    162E  THR*     3.1     7.4    -      -       -      +
    165E  GLU*     5.4     0.9    +      -       -      -
    168E  ARG*     2.9    86.7    +      -       +      +
    171E  LEU*     3.7    17.7    -      -       +      +
    172E  LYS*     3.6    25.8    +      -       +      -
    175E  LEU*     5.0     2.5    -      -       +      -
----------------------------------------------------------
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Residues in contact with SER 160 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    260A  ARG*     3.7    58.3    +      -       -      +
    262A  HIS*     5.0     2.9    +      -       -      -
    156E  SER      3.6     4.9    +      -       -      -
    157E  ARG      2.9    11.0    +      -       -      -
    159E  TYR*     1.3    81.5    -      -       -      +
    161E  MET*     1.3    61.9    +      -       -      +
    162E  THR      3.5     3.1    -      -       -      -
    168E  ARG*     4.4     5.7    +      -       -      +
----------------------------------------------------------
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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