Contacts of the helix formed by residues 126 - 150 (chain A) in PDB entry 3J41


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 SER 126 (chain A).
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    124A  GLY      4.0     1.6    +      -       -      -
    125A  VAL*     1.3    77.2    -      -       -      +
    127A  VAL*     1.3    59.8    +      -       -      +
    128A  GLY*     3.2     6.3    +      -       -      -
    129A  GLN*     3.0    40.6    +      -       -      +
    130A  ALA*     2.9    25.5    +      -       -      +
----------------------------------------------------------
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Residues in contact with VAL 127 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    121A  LEU*     5.1     2.9    -      -       -      -
    125A  VAL      3.8     0.8    +      -       -      -
    126A  SER*     1.3    74.1    -      -       -      +
    128A  GLY*     1.3    56.1    +      -       -      +
    130A  ALA*     3.7     8.0    -      -       -      +
    131A  THR*     2.6    41.1    +      -       -      +
    200A  ASN*     4.5    16.8    -      -       -      +
    202A  TRP*     4.4    13.2    -      -       +      +
    203A  VAL*     3.6    22.4    -      -       +      +
----------------------------------------------------------
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Residues in contact with GLY 128 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    126A  SER*     3.1     6.2    +      -       -      -
    127A  VAL*     1.3    81.9    -      -       -      +
    129A  GLN*     1.3    64.0    +      -       -      +
    131A  THR*     3.3     6.8    +      -       -      -
    132A  ILE*     3.2    30.6    +      -       -      +
----------------------------------------------------------
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Residues in contact with GLN 129 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    124A  GLY      3.9     5.5    -      -       -      +
    125A  VAL*     3.9    10.3    -      -       +      +
    126A  SER*     3.0    38.8    +      -       -      +
    128A  GLY*     1.3    75.4    -      -       -      +
    130A  ALA*     1.3    58.4    +      -       -      +
    132A  ILE*     3.1     8.3    +      -       +      +
    133A  VAL      2.9    17.3    +      -       -      -
    106B  SER      2.6    31.5    +      -       -      +
    107B  VAL*     2.8    48.3    -      -       +      +
    108B  THR      4.1     6.3    +      -       -      +
    109B  PRO*     5.2     2.1    -      -       -      +
    113B  ARG*     5.0     4.2    -      -       -      +
----------------------------------------------------------
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Residues in contact with ALA 130 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    121A  LEU*     3.0    38.8    -      -       +      -
    125A  VAL*     3.6     8.7    -      -       +      +
    126A  SER      2.9    17.5    +      -       -      +
    127A  VAL*     3.7     6.3    -      -       -      +
    129A  GLN*     1.3    78.7    -      -       -      +
    131A  THR*     1.3    56.6    +      -       -      +
    133A  VAL*     3.5     4.1    +      -       -      +
    134A  GLU*     3.0    32.6    +      -       -      +
    179A  THR*     3.5     9.8    -      -       +      +
    203A  VAL*     3.9     4.7    -      -       +      -
----------------------------------------------------------
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Residues in contact with THR 131 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    127A  VAL*     2.6    25.2    +      -       -      +
    128A  GLY*     3.6     7.8    -      -       -      -
    129A  GLN      3.2     0.2    -      -       -      -
    130A  ALA*     1.3    74.7    -      -       -      +
    132A  ILE*     1.3    62.5    +      -       +      +
    134A  GLU*     4.4     1.6    -      -       -      -
    135A  ILE*     2.9    41.3    +      -       +      +
    202A  TRP*     4.4     6.0    +      -       -      +
    203A  VAL*     3.6    22.8    -      -       -      +
    206A  VAL*     3.6    30.3    -      -       +      -
    207A  GLY*     3.7     9.9    -      -       -      +
    210A  ILE*     5.3     0.7    -      -       +      -
----------------------------------------------------------
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Residues in contact with ILE 132 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    128A  GLY      3.2    18.3    +      -       -      +
    129A  GLN*     3.1     9.7    +      -       +      +
    131A  THR*     1.3    74.3    -      -       +      +
    133A  VAL*     1.3    67.0    +      -       -      +
    135A  ILE*     3.2    13.7    +      -       +      +
    136A  PHE*     3.0    45.1    +      -       +      -
     25B  PHE*     6.0     0.7    -      -       +      -
    103B  VAL*     4.6     4.7    -      -       +      -
    106B  SER*     5.5     1.6    -      -       -      +
    107B  VAL*     3.6    26.9    -      -       +      -
----------------------------------------------------------
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Residues in contact with VAL 133 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    129A  GLN      2.9     8.7    +      -       -      +
    130A  ALA*     3.6     9.9    -      -       -      +
    132A  ILE*     1.3    78.4    -      -       -      +
    134A  GLU*     1.3    63.9    +      -       -      +
    136A  PHE*     3.1     7.3    +      -       -      +
    137A  LEU*     2.9    40.4    +      -       +      +
    174A  PHE*     3.6    30.7    -      -       +      -
    175A  GLY*     4.6     0.9    -      -       -      -
    178A  TYR*     4.1    33.4    -      -       +      -
    179A  THR*     4.5     5.4    -      -       +      +
     25B  PHE*     5.1     3.4    -      -       +      -
    107B  VAL*     3.1    31.2    -      -       +      -
----------------------------------------------------------
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Residues in contact with GLU 134 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    130A  ALA      3.0    20.5    +      -       -      +
    131A  THR      3.8     0.9    -      -       -      +
    132A  ILE      3.3     0.2    -      -       -      -
    133A  VAL*     1.3    75.8    -      -       -      +
    135A  ILE*     1.3    57.7    +      -       -      +
    137A  LEU*     3.6     8.1    -      -       -      +
    138A  THR*     2.8    35.0    +      -       -      -
    179A  THR*     2.6    27.1    +      -       -      +
    181A  ALA*     3.4     2.8    -      -       -      -
    182A  GLY*     2.7    23.4    +      -       -      -
    183A  MET*     2.7    28.9    +      -       -      -
    203A  VAL*     3.9    18.4    -      -       +      +
    204A  TYR*     3.8     9.6    -      -       +      -
    207A  GLY*     3.8    20.8    -      -       -      -
    208A  PRO*     3.6     7.5    -      -       +      +
----------------------------------------------------------
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Residues in contact with ILE 135 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    131A  THR*     2.9    38.1    +      -       +      +
    132A  ILE*     3.3    17.7    -      -       +      +
    133A  VAL      3.1     0.2    -      -       -      -
    134A  GLU*     1.3    73.9    -      -       -      +
    136A  PHE*     1.3    70.8    +      -       +      +
    138A  THR      3.4     0.2    +      -       -      -
    139A  LEU*     2.8    35.6    +      -       +      +
    207A  GLY*     3.4    23.8    -      -       -      +
    210A  ILE*     3.7    25.8    -      -       +      -
    211A  GLY*     3.3    15.8    -      -       -      +
    214A  LEU*     3.9    20.0    -      -       +      -
----------------------------------------------------------
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Residues in contact with PHE 136 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    132A  ILE*     3.0    42.3    +      -       +      +
    133A  VAL      3.1     6.5    +      -       -      +
    135A  ILE*     1.3    85.2    -      -       +      +
    137A  LEU*     1.3    62.9    +      -       -      +
    139A  LEU*     3.6    12.4    -      -       +      +
    140A  GLN*     3.1    27.4    +      -       -      +
     21B  LEU*     3.6    29.2    -      -       +      -
     22B  PHE*     4.0    21.6    -      +       -      -
     25B  PHE*     3.9    35.4    -      +       +      -
     26B  PHE*     3.4     5.2    -      -       +      -
    103B  VAL*     3.5    26.5    -      -       +      -
----------------------------------------------------------
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Residues in contact with LEU 137 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    133A  VAL*     2.9    33.6    +      -       +      +
    134A  GLU*     3.6    29.8    -      -       -      +
    136A  PHE*     1.3    76.3    -      -       -      +
    138A  THR*     1.3    61.9    +      -       -      +
    140A  GLN*     3.0    26.5    -      -       -      +
    141A  PHE*     3.2     7.3    +      -       -      +
    171A  GLY*     3.5    20.0    -      -       -      +
    174A  PHE*     3.3    36.8    -      -       +      -
    175A  GLY*     4.1     2.7    -      -       -      -
    179A  THR*     4.3     0.2    -      -       -      +
    181A  ALA*     4.1     9.9    -      -       -      -
    183A  MET*     3.5    25.6    -      -       +      +
     26B  PHE*     3.6    13.0    -      -       +      -
----------------------------------------------------------
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Residues in contact with THR 138 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     68A  ASN*     5.6     0.4    -      -       -      +
     70A  ALA*     4.3     5.4    -      -       +      -
     71A  VAL*     5.8     0.4    -      -       +      +
    134A  GLU      2.8    17.7    +      -       -      -
    135A  ILE      4.0     1.8    -      -       -      -
    137A  LEU*     1.3    74.9    -      -       -      +
    139A  LEU*     1.3    56.2    +      -       -      +
    141A  PHE*     3.9     9.0    -      -       +      -
    142A  VAL*     2.7    44.9    +      -       +      +
    183A  MET*     3.6    21.0    -      -       -      +
    208A  PRO*     3.0    49.1    -      -       +      +
    211A  GLY*     4.2     0.9    -      -       -      -
    212A  ALA*     3.7     8.1    -      -       +      +
----------------------------------------------------------
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Residues in contact with LEU 139 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    135A  ILE*     2.8    22.0    +      -       +      +
    136A  PHE*     3.6    13.9    -      -       +      +
    137A  LEU      3.3     0.2    -      -       -      -
    138A  THR*     1.3    74.3    -      -       -      +
    140A  GLN*     1.3    61.5    +      -       -      +
    142A  VAL*     4.1     0.3    -      -       -      +
    143A  LEU*     2.9    33.6    +      -       +      +
    211A  GLY*     3.5    11.6    +      -       -      +
    214A  LEU*     3.8    23.6    -      -       +      +
    215A  GLY*     3.2    31.4    -      -       -      +
    218A  LEU*     4.2    16.8    -      -       +      -
     22B  PHE*     3.7    29.8    -      -       +      -
----------------------------------------------------------
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Residues in contact with GLN 140 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    136A  PHE      3.1    13.2    +      -       -      +
    137A  LEU      3.0    17.4    -      -       -      +
    139A  LEU*     1.3    77.8    -      -       -      +
    141A  PHE*     1.3    69.1    +      -       -      +
    143A  LEU*     3.6    11.3    -      -       -      +
    144A  CYS*     3.0    22.2    +      -       -      +
    167A  SER*     2.6    42.8    +      -       -      +
    170A  LEU*     4.0    11.7    -      -       +      +
    171A  GLY*     3.8     8.1    +      -       -      -
    183A  MET*     3.7     7.8    -      -       -      +
     22B  PHE*     4.9    12.8    -      -       +      -
     26B  PHE*     3.3    27.6    -      -       +      -
     54B  THR*     3.5    19.9    -      -       +      +
     55B  LEU*     5.5     3.6    -      -       +      -
     58B  ALA*     5.7     0.2    -      -       -      +
----------------------------------------------------------
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Residues in contact with PHE 141 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     23A  TYR*     5.7     0.7    -      -       -      -
     52A  LEU*     3.3    27.6    -      -       +      -
     68A  ASN*     3.9    11.9    -      -       +      -
     71A  VAL*     3.8    25.4    -      -       +      -
    137A  LEU      3.2    15.9    +      -       -      +
    138A  THR*     3.4    11.2    -      -       +      +
    139A  LEU      3.1     0.2    -      -       -      -
    140A  GLN*     1.3    82.2    -      -       -      +
    142A  VAL*     1.3    63.1    +      -       -      +
    144A  CYS*     3.1     6.8    +      -       -      +
    145A  ILE*     3.0    36.1    +      -       +      +
    164A  VAL*     3.5    27.8    -      -       +      -
    167A  SER*     3.3    21.1    -      -       -      +
    168A  LEU*     3.9    20.9    -      -       +      -
    183A  MET*     3.7    22.2    -      -       +      -
----------------------------------------------------------
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Residues in contact with VAL 142 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     71A  VAL*     4.6    17.0    -      -       +      -
     74A  ALA*     3.8    12.3    -      -       +      -
    138A  THR*     2.7    29.8    +      -       +      +
    139A  LEU      4.1     2.0    -      -       -      +
    141A  PHE*     1.3    71.0    -      -       +      +
    143A  LEU*     1.3    60.6    +      -       -      +
    145A  ILE*     3.0     9.4    +      -       +      +
    146A  PHE*     2.8    49.5    +      -       +      -
    212A  ALA*     3.5    44.9    -      -       +      +
    215A  GLY*     4.1     1.6    -      -       -      -
    216A  SER      3.9    10.5    -      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 143 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    139A  LEU*     2.9    22.5    +      -       +      +
    140A  GLN*     3.6     7.6    -      -       -      +
    142A  VAL*     1.3    78.3    -      -       -      +
    144A  CYS*     1.3    56.7    +      -       -      +
    146A  PHE*     4.0     3.5    -      -       -      +
    147A  ALA*     3.0    24.4    +      -       -      +
    215A  GLY*     4.6     7.4    -      -       -      +
    218A  LEU*     4.2    16.4    -      -       +      -
    219A  TYR*     3.7    31.9    -      -       +      +
     18B  PHE*     5.9     1.1    -      -       +      -
     22B  PHE*     3.9    30.5    -      -       +      -
     55B  LEU*     5.4     2.7    -      -       +      -
     58B  ALA*     3.7    28.3    -      -       +      +
     59B  VAL*     5.0    10.5    -      -       +      -
----------------------------------------------------------
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Residues in contact with CYS 144 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    140A  GLN      3.0    13.9    +      -       -      +
    141A  PHE      3.1     9.4    +      -       -      +
    143A  LEU*     1.3    74.8    -      -       -      +
    145A  ILE*     1.3    55.5    +      -       +      +
    147A  ALA*     4.1     0.8    -      -       -      +
    148A  THR*     2.6    55.4    +      -       -      +
    163A  ALA*     3.9    29.6    -      -       -      -
    164A  VAL*     4.3     2.5    -      -       -      -
    167A  SER*     3.8    14.8    -      -       -      +
     54B  THR*     3.9    25.1    -      -       +      +
     57B  GLN*     4.4     2.2    -      -       -      -
     58B  ALA*     4.6     8.3    -      -       -      -
----------------------------------------------------------
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Residues in contact with ILE 145 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     71A  VAL*     3.7    34.1    -      -       +      -
     75A  PHE*     3.5    33.0    -      -       +      -
    141A  PHE*     3.0    33.8    +      -       +      +
    142A  VAL*     3.0    12.7    +      -       +      +
    144A  CYS*     1.3    74.4    -      -       +      +
    146A  PHE*     1.3    62.8    +      -       +      +
    148A  THR*     3.2     6.1    +      -       -      -
    149A  TYR*     2.8    51.0    +      -       +      +
    164A  VAL*     3.9    23.3    -      -       +      -
----------------------------------------------------------
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Residues in contact with PHE 146 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     71A  VAL*     6.1     0.2    -      -       +      -
     74A  ALA*     3.3    33.4    -      -       +      -
     75A  PHE*     3.7    36.1    -      +       -      -
     78A  GLY*     4.6     4.9    -      -       -      -
     80A  GLN*     4.2    14.6    -      -       -      -
    142A  VAL*     2.8    40.6    +      -       +      +
    143A  LEU*     4.0     2.5    -      -       -      +
    145A  ILE*     1.3    75.4    -      -       +      +
    147A  ALA*     1.3    62.6    +      -       -      +
    149A  TYR*     3.9     3.3    -      -       -      +
    150A  ASP*     2.9    26.2    +      -       -      +
    216A  SER*     3.3    24.5    -      -       -      -
    219A  TYR*     3.8    23.9    -      +       +      -
    220A  ASP*     3.1    28.7    -      -       -      -
----------------------------------------------------------
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Residues in contact with ALA 147 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    143A  LEU      3.0    19.3    +      -       -      +
    144A  CYS      4.1     2.0    -      -       -      +
    146A  PHE*     1.3    76.9    -      -       -      +
    148A  THR*     1.3    58.4    +      -       -      +
    150A  ASP*     3.3    17.5    -      -       -      +
    153A  ARG*     3.0    22.3    +      -       -      +
    219A  TYR*     3.5    19.4    -      -       +      -
     57B  GLN      3.6     5.4    -      -       -      +
     58B  ALA*     3.4    36.6    -      -       -      +
     61B  HIS*     4.0     0.4    -      -       -      +
----------------------------------------------------------
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Residues in contact with THR 148 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    144A  CYS*     2.6    29.8    +      -       -      +
    145A  ILE      3.2     6.2    +      -       -      -
    147A  ALA*     1.3    75.0    -      -       +      +
    149A  TYR*     1.3    71.2    +      -       -      +
    150A  ASP      3.3     1.3    -      -       -      +
    157A  LEU*     3.9    11.1    -      -       +      +
    160A  VAL*     3.6    32.8    -      -       -      +
    163A  ALA*     4.1    12.1    -      -       +      -
    164A  VAL*     3.6    10.7    -      -       -      +
     57B  GLN*     3.8    34.8    -      -       +      +
    156D  ARG*     3.8    11.3    +      -       -      -
----------------------------------------------------------
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Residues in contact with TYR 149 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     56A  VAL*     4.0    18.2    -      -       +      +
     60A  GLY*     6.1     0.2    -      -       -      -
     64A  GLY*     2.7    38.6    +      -       -      -
     65A  ALA      3.5     9.4    +      -       -      -
     66A  HIS*     5.0     0.9    -      +       -      -
     75A  PHE*     3.5    32.3    -      +       +      -
     80A  GLN*     6.0     1.8    -      -       -      +
    145A  ILE*     2.8    35.5    +      -       +      +
    146A  PHE*     4.0     4.0    -      -       -      +
    148A  THR*     1.3    83.3    -      -       -      +
    150A  ASP*     1.3    65.8    +      -       -      +
    151A  GLU*     3.0     9.6    +      -       -      +
    160A  VAL*     4.2    16.2    -      -       +      -
    164A  VAL*     4.1    19.0    -      -       +      +
    156D  ARG*     4.8     5.4    +      -       -      +
----------------------------------------------------------
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Residues in contact with ASP 150 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    146A  PHE      2.9    18.9    +      -       -      +
    147A  ALA      3.3    10.8    -      -       -      +
    148A  THR      3.3     0.6    -      -       -      +
    149A  TYR*     1.3    73.7    -      -       -      +
    151A  GLU*     1.3    69.4    +      -       -      +
    152A  ARG*     3.0    55.0    +      -       -      +
    153A  ARG*     3.4    17.6    +      -       +      +
    219A  TYR*     2.4    25.6    +      -       +      +
     61B  HIS*     4.6     1.9    -      -       -      -
    156D  ARG*     3.3    13.0    +      -       -      -
----------------------------------------------------------
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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