Contacts of the helix formed by residues 126 - 150 (chain B) 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 B).
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    124B  GLY      4.0     1.6    +      -       -      -
    125B  VAL*     1.3    77.8    -      -       -      +
    127B  VAL*     1.3    60.0    +      -       -      +
    128B  GLY*     3.2     6.0    +      -       -      -
    129B  GLN*     3.0    39.6    +      -       -      +
    130B  ALA*     2.9    25.2    +      -       -      +
----------------------------------------------------------
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Residues in contact with VAL 127 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    121B  LEU*     5.1     3.4    -      -       +      -
    125B  VAL      3.8     0.8    +      -       -      -
    126B  SER*     1.3    75.1    -      -       -      +
    128B  GLY*     1.3    54.5    +      -       -      +
    130B  ALA*     3.7     8.2    -      -       -      +
    131B  THR*     2.6    40.8    +      -       -      +
    200B  ASN*     4.5    16.4    -      -       -      +
    202B  TRP*     4.4    13.5    -      -       +      +
    203B  VAL*     3.6    22.6    -      -       +      +
----------------------------------------------------------
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Residues in contact with GLY 128 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    126B  SER*     3.1     6.5    +      -       -      -
    127B  VAL*     1.3    81.5    -      -       -      +
    129B  GLN*     1.3    63.4    +      -       -      +
    131B  THR*     3.3     7.0    +      -       -      -
    132B  ILE*     3.2    29.8    +      -       -      +
----------------------------------------------------------
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Residues in contact with GLN 129 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    124B  GLY      3.9     6.2    -      -       -      +
    125B  VAL*     3.9    10.6    -      -       +      +
    126B  SER*     3.0    37.1    +      -       -      +
    128B  GLY*     1.3    75.9    -      -       -      +
    130B  ALA*     1.3    58.4    +      -       -      +
    132B  ILE*     3.1     8.0    +      -       +      +
    133B  VAL*     2.9    17.3    +      -       -      +
    106C  SER      2.6    30.1    +      -       -      +
    107C  VAL*     2.8    48.5    -      -       +      +
    108C  THR      4.1     6.3    +      -       -      +
    109C  PRO*     5.2     2.5    -      -       -      +
    113C  ARG*     5.0     4.2    -      -       -      +
----------------------------------------------------------
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Residues in contact with ALA 130 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    121B  LEU*     3.0    39.3    -      -       +      -
    125B  VAL*     3.6     8.0    -      -       +      +
    126B  SER      2.9    17.2    +      -       -      +
    127B  VAL*     3.7     5.4    -      -       -      +
    129B  GLN*     1.3    79.3    -      -       -      +
    131B  THR*     1.3    55.8    +      -       -      +
    133B  VAL*     3.5     4.2    +      -       -      +
    134B  GLU*     3.0    32.6    +      -       -      +
    179B  THR*     3.5     9.6    -      -       +      +
    203B  VAL*     3.9     4.9    -      -       +      -
----------------------------------------------------------
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Residues in contact with THR 131 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    127B  VAL*     2.6    25.9    +      -       -      +
    128B  GLY*     3.6     7.9    -      -       -      -
    129B  GLN      3.2     0.4    -      -       -      -
    130B  ALA*     1.3    74.1    -      -       -      +
    132B  ILE*     1.3    62.2    +      -       +      +
    134B  GLU*     3.5     2.1    +      -       -      -
    135B  ILE*     2.9    41.4    +      -       +      +
    202B  TRP*     4.4     5.8    +      -       -      +
    203B  VAL*     3.6    23.1    -      -       -      +
    206B  VAL*     3.6    31.4    -      -       +      -
    207B  GLY*     3.7     8.9    -      -       -      +
    210B  ILE*     5.3     0.7    -      -       +      -
----------------------------------------------------------
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Residues in contact with ILE 132 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    128B  GLY      3.2    17.0    +      -       -      +
    129B  GLN*     3.1    10.2    +      -       +      +
    131B  THR*     1.3    75.1    -      -       -      +
    133B  VAL*     1.3    67.0    +      -       -      +
    135B  ILE*     3.2    13.9    +      -       +      +
    136B  PHE*     3.0    45.6    +      -       +      -
     25C  PHE*     6.0     0.4    -      -       +      -
    103C  VAL*     4.6     4.5    -      -       +      -
    106C  SER*     5.5     2.0    -      -       -      +
    107C  VAL*     3.6    27.4    -      -       +      -
----------------------------------------------------------
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Residues in contact with VAL 133 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    129B  GLN      2.9     9.5    +      -       -      +
    130B  ALA*     3.6    10.5    -      -       -      +
    132B  ILE*     1.3    77.2    -      -       -      +
    134B  GLU*     1.3    63.7    +      -       -      +
    136B  PHE*     3.1     7.9    +      -       -      +
    137B  LEU*     2.9    40.2    +      -       +      +
    174B  PHE*     3.6    31.0    -      -       +      -
    175B  GLY*     4.6     0.9    -      -       -      -
    178B  TYR*     4.1    32.5    -      -       +      -
    179B  THR*     4.5     6.7    -      -       +      +
     25C  PHE*     5.1     3.6    -      -       +      -
    107C  VAL*     3.1    31.9    -      -       +      -
----------------------------------------------------------
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Residues in contact with GLU 134 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    130B  ALA      3.0    20.5    +      -       -      +
    131B  THR      3.8     1.1    -      -       -      +
    132B  ILE      3.3     0.2    -      -       -      -
    133B  VAL*     1.3    75.7    -      -       -      +
    135B  ILE*     1.3    57.6    +      -       -      +
    137B  LEU*     3.6     8.5    -      -       -      +
    138B  THR*     2.8    34.8    +      -       -      -
    179B  THR*     2.6    27.4    +      -       -      +
    181B  ALA*     3.4     2.8    -      -       -      -
    182B  GLY*     2.7    22.8    +      -       -      -
    183B  MET*     2.7    29.5    +      -       -      -
    203B  VAL*     3.9    19.1    -      -       +      +
    204B  TYR*     3.8     8.2    -      -       +      -
    207B  GLY*     3.8    19.4    -      -       -      -
    208B  PRO*     3.6     8.2    -      -       +      +
----------------------------------------------------------
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Residues in contact with ILE 135 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    131B  THR*     2.9    37.0    +      -       +      +
    132B  ILE*     3.3    16.4    -      -       +      +
    133B  VAL      3.1     0.2    -      -       -      -
    134B  GLU*     1.3    74.3    -      -       -      +
    136B  PHE*     1.3    71.2    +      -       +      +
    138B  THR      3.4     0.2    +      -       -      -
    139B  LEU*     2.8    34.6    +      -       +      +
    207B  GLY*     3.4    24.0    -      -       -      +
    210B  ILE*     3.7    25.4    -      -       +      -
    211B  GLY*     3.3    15.6    -      -       -      -
    214B  LEU*     3.9    19.5    -      -       +      -
----------------------------------------------------------
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Residues in contact with PHE 136 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    132B  ILE*     3.0    43.4    +      -       +      +
    133B  VAL      3.7     5.8    -      -       -      +
    135B  ILE*     1.3    85.3    -      -       +      +
    137B  LEU*     1.3    63.2    +      -       -      +
    139B  LEU*     3.6    12.1    -      -       +      +
    140B  GLN*     3.1    26.3    +      -       -      +
     21C  LEU*     3.6    28.7    -      -       +      -
     22C  PHE*     4.0    20.3    -      +       -      -
     25C  PHE*     3.8    36.8    -      +       +      -
     26C  PHE*     3.4     5.4    -      -       +      -
    103C  VAL*     3.5    27.1    -      -       +      -
----------------------------------------------------------
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Residues in contact with LEU 137 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    133B  VAL*     2.9    32.4    +      -       +      +
    134B  GLU*     3.6    29.6    -      -       -      +
    136B  PHE*     1.3    77.0    -      -       -      +
    138B  THR*     1.3    61.6    +      -       -      +
    140B  GLN*     3.0    26.0    -      -       -      +
    141B  PHE*     3.2     7.1    +      -       -      +
    171B  GLY*     3.5    20.2    -      -       -      +
    174B  PHE*     3.3    37.0    -      -       +      -
    175B  GLY*     4.1     2.9    -      -       -      -
    179B  THR*     4.3     0.2    -      -       -      +
    181B  ALA*     4.1    10.1    -      -       -      -
    183B  MET*     3.5    24.5    -      -       +      +
     26C  PHE*     3.7    14.1    -      -       +      -
----------------------------------------------------------
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Residues in contact with THR 138 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     68B  ASN*     5.6     0.2    -      -       -      +
     70B  ALA*     4.3     6.3    -      -       +      -
     71B  VAL*     5.9     0.2    -      -       +      -
    134B  GLU      2.8    17.5    +      -       -      -
    135B  ILE      4.0     2.0    -      -       -      -
    137B  LEU*     1.3    74.3    -      -       -      +
    139B  LEU*     1.3    56.5    +      -       -      +
    141B  PHE*     3.9     9.2    -      -       +      -
    142B  VAL*     2.7    45.4    +      -       +      +
    183B  MET*     3.6    20.7    -      -       -      +
    208B  PRO*     3.0    47.5    -      -       +      +
    211B  GLY      4.2     0.9    -      -       -      -
    212B  ALA*     3.7     9.4    -      -       +      +
----------------------------------------------------------
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Residues in contact with LEU 139 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    135B  ILE*     2.8    21.6    +      -       +      +
    136B  PHE*     3.6    14.1    -      -       +      +
    137B  LEU      3.3     0.4    -      -       -      -
    138B  THR*     1.3    74.0    -      -       -      +
    140B  GLN*     1.3    60.9    +      -       -      +
    142B  VAL*     4.0     0.7    -      -       -      +
    143B  LEU*     2.9    32.6    +      -       +      +
    211B  GLY*     3.5    11.4    +      -       -      +
    214B  LEU*     3.8    24.2    -      -       +      +
    215B  GLY*     3.2    30.7    -      -       -      +
    218B  LEU*     4.2    17.7    -      -       +      -
     22C  PHE*     3.7    29.8    -      -       +      -
----------------------------------------------------------
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Residues in contact with GLN 140 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    136B  PHE      3.1    13.3    +      -       -      +
    137B  LEU      3.0    17.9    -      -       -      +
    139B  LEU*     1.3    79.0    -      -       -      +
    141B  PHE*     1.3    70.3    +      -       -      +
    143B  LEU*     3.6    11.3    -      -       -      +
    144B  CYS*     3.0    21.5    +      -       -      +
    167B  SER*     2.6    44.2    +      -       -      +
    170B  LEU*     4.0    12.0    -      -       +      +
    171B  GLY*     3.8     8.3    +      -       -      -
    183B  MET*     3.7     7.3    -      -       -      +
     22C  PHE*     4.9    12.3    -      -       +      -
     26C  PHE*     3.3    27.4    -      -       +      -
     54C  THR*     3.5    20.0    -      -       +      +
     55C  LEU*     5.5     3.6    -      -       +      -
----------------------------------------------------------
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Residues in contact with PHE 141 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     23B  TYR*     5.7     0.4    -      -       -      -
     52B  LEU*     3.3    28.5    -      -       +      -
     68B  ASN*     3.9    11.9    -      -       +      -
     71B  VAL*     3.8    26.0    -      -       +      -
    137B  LEU      3.2    15.5    -      -       -      +
    138B  THR*     3.4    11.4    -      -       +      +
    140B  GLN*     1.3    83.0    -      -       -      +
    142B  VAL*     1.3    62.5    +      -       +      +
    144B  CYS*     3.1     6.8    +      -       -      +
    145B  ILE*     3.0    35.3    +      -       +      +
    164B  VAL*     3.5    27.8    -      -       +      -
    167B  SER*     3.3    22.0    -      -       -      +
    168B  LEU*     3.9    21.3    -      -       +      -
    183B  MET*     3.7    22.4    -      -       +      -
----------------------------------------------------------
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Residues in contact with VAL 142 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     71B  VAL*     4.6    16.4    -      -       +      -
     74B  ALA*     3.8    12.3    -      -       +      -
    138B  THR*     2.7    28.8    +      -       +      +
    139B  LEU      4.1     2.2    -      -       -      +
    141B  PHE*     1.3    69.8    -      -       +      +
    143B  LEU*     1.3    60.9    +      -       -      +
    145B  ILE*     3.0     9.8    +      -       +      +
    146B  PHE*     2.8    49.1    +      -       +      -
    212B  ALA*     3.5    46.0    -      -       +      +
    215B  GLY*     4.1     1.8    -      -       -      -
    216B  SER      3.9    10.3    -      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 143 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    139B  LEU*     2.9    21.7    +      -       +      +
    140B  GLN*     3.6     7.2    -      -       -      +
    142B  VAL*     1.3    78.4    -      -       -      +
    144B  CYS*     1.3    56.9    +      -       -      +
    146B  PHE*     4.0     3.3    -      -       -      +
    147B  ALA*     3.0    24.3    +      -       -      +
    215B  GLY*     4.6     7.6    -      -       -      +
    218B  LEU*     4.2    16.2    -      -       +      -
    219B  TYR*     3.7    32.8    -      -       +      +
     18C  PHE*     5.9     1.3    -      -       +      -
     22C  PHE*     3.9    30.1    -      -       +      -
     55C  LEU*     5.4     2.7    -      -       +      -
     58C  ALA*     3.7    29.8    -      -       +      +
     59C  VAL*     5.0     9.4    -      -       +      -
----------------------------------------------------------
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Residues in contact with CYS 144 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    140B  GLN      3.0    13.9    +      -       -      +
    141B  PHE      3.1     9.4    +      -       -      +
    143B  LEU*     1.3    74.0    -      -       -      +
    145B  ILE*     1.3    56.0    +      -       +      +
    147B  ALA*     4.6     1.3    -      -       -      -
    148B  THR*     2.6    56.2    +      -       -      +
    163B  ALA*     3.9    28.5    -      -       -      -
    164B  VAL*     4.3     3.1    -      -       -      -
    167B  SER*     3.8    15.3    -      -       -      +
     54C  THR*     3.9    25.4    -      -       +      +
     57C  GLN*     4.4     2.0    -      -       -      -
     58C  ALA*     4.6     7.9    -      -       -      +
----------------------------------------------------------
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Residues in contact with ILE 145 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     71B  VAL*     3.7    35.4    -      -       +      -
     75B  PHE*     3.5    32.3    -      -       +      -
    141B  PHE*     3.0    34.0    +      -       +      +
    142B  VAL*     3.0    12.2    +      -       +      +
    144B  CYS*     1.3    74.3    -      -       -      +
    146B  PHE*     1.3    63.5    +      -       +      +
    148B  THR*     3.2     6.3    +      -       -      -
    149B  TYR*     2.8    50.8    +      -       +      +
    164B  VAL*     3.9    23.8    -      -       +      -
----------------------------------------------------------
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Residues in contact with PHE 146 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     71B  VAL*     6.1     0.4    -      -       +      -
     74B  ALA*     3.3    34.1    -      -       +      -
     75B  PHE*     3.7    34.5    -      +       -      -
     78B  GLY*     4.6     3.4    -      -       -      -
     80B  GLN*     4.2    14.4    -      -       -      -
    142B  VAL*     2.8    38.5    +      -       +      +
    143B  LEU*     4.0     2.5    -      -       -      +
    145B  ILE*     1.3    75.9    -      -       +      +
    147B  ALA*     1.3    63.2    +      -       -      +
    149B  TYR*     3.9     3.7    -      -       -      +
    150B  ASP*     2.9    26.7    +      -       -      +
    215B  GLY      5.2     0.2    -      -       -      -
    216B  SER*     3.3    25.8    -      -       -      -
    219B  TYR*     3.8    25.1    -      +       +      -
    220B  ASP*     3.5    24.7    -      -       -      -
    222B  LEU*     6.3     0.2    -      -       +      -
----------------------------------------------------------
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Residues in contact with ALA 147 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    143B  LEU      3.0    19.8    +      -       -      +
    144B  CYS      4.1     1.6    -      -       -      +
    146B  PHE*     1.3    76.0    -      -       -      +
    148B  THR*     1.3    56.9    +      -       -      +
    150B  ASP*     3.3    17.5    -      -       -      +
    153B  ARG*     3.0    21.6    +      -       -      +
    219B  TYR*     3.5    19.0    -      -       +      -
     57C  GLN      3.6     7.6    -      -       -      +
     58C  ALA*     3.4    36.6    -      -       -      +
     61C  HIS*     4.1     0.2    -      -       -      +
----------------------------------------------------------
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Residues in contact with THR 148 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    156A  ARG*     3.8    11.6    +      -       -      -
    144B  CYS*     2.6    30.5    +      -       -      +
    145B  ILE      3.2     6.2    +      -       -      -
    147B  ALA*     1.3    73.9    -      -       +      +
    149B  TYR*     1.3    70.9    +      -       -      +
    150B  ASP      3.3     0.9    -      -       -      -
    157B  LEU*     3.9    11.6    -      -       +      +
    160B  VAL*     3.6    30.9    -      -       -      +
    163B  ALA*     4.1    11.7    -      -       +      -
    164B  VAL*     3.6    10.9    -      -       -      +
     57C  GLN*     3.8    35.9    -      -       +      +
----------------------------------------------------------
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Residues in contact with TYR 149 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    156A  ARG*     4.7     6.2    +      -       -      +
     56B  VAL*     4.0    18.8    -      -       +      +
     60B  GLY*     6.1     0.7    -      -       -      -
     64B  GLY*     2.7    37.4    +      -       -      -
     65B  ALA      3.5     9.9    +      -       -      -
     66B  HIS*     5.0     0.7    -      +       -      -
     71B  VAL*     6.2     0.2    -      -       +      -
     75B  PHE*     3.5    33.0    -      +       +      -
     80B  GLN*     6.0     2.5    -      -       -      +
    145B  ILE*     2.8    35.8    +      -       +      +
    146B  PHE*     4.0     3.4    -      -       -      +
    148B  THR*     1.3    83.0    -      -       -      +
    150B  ASP*     1.3    66.3    +      -       -      +
    151B  GLU*     3.0     9.4    +      -       -      +
    160B  VAL*     4.2    15.7    -      -       +      -
    164B  VAL*     4.1    18.9    -      -       +      +
----------------------------------------------------------
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Residues in contact with ASP 150 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    156A  ARG*     3.3    13.4    +      -       -      -
    146B  PHE      2.9    18.5    +      -       -      +
    147B  ALA      3.3    11.4    -      -       -      +
    148B  THR      3.3     0.2    -      -       -      -
    149B  TYR*     1.3    73.8    -      -       -      +
    151B  GLU*     1.3    70.1    +      -       -      +
    152B  ARG*     3.0    55.9    +      -       -      +
    153B  ARG*     3.4    17.8    +      -       +      +
    219B  TYR*     2.4    25.0    +      -       +      +
    222B  LEU*     4.1     7.3    -      -       +      +
     61C  HIS*     4.6     1.7    -      -       -      -
----------------------------------------------------------
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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