Contacts of the helix formed by residues 106 - 135 (chain B) in PDB entry 2WLJ


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 GLY 106 (chain B).
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     74B  VAL*     3.8    23.3    -      -       -      +
    105B  ILE*     1.3    89.3    -      -       -      +
    107B  PRO*     1.3    70.0    -      -       -      +
    108B  LEU*     2.9    11.7    -      -       -      -
    109B  ALA*     3.7     3.2    -      -       -      +
    110B  ASN*     2.9    21.7    +      -       -      +
----------------------------------------------------------
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Residues in contact with PRO 107 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    105B  ILE      4.2     2.7    -      -       -      +
    106B  GLY*     1.3    81.3    -      -       -      +
    108B  LEU*     1.3    67.1    +      -       +      +
    110B  ASN*     4.0     7.1    -      -       +      +
    111B  THR*     3.1    28.6    +      -       -      -
----------------------------------------------------------
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Residues in contact with LEU 108 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     71B  CYS*     4.0    37.5    -      -       +      +
     74B  VAL*     4.9     3.1    -      -       +      -
    106B  GLY*     2.9     5.6    -      -       -      -
    107B  PRO*     1.3    84.2    -      -       +      +
    109B  ALA*     1.3    65.6    +      -       -      +
    111B  THR*     3.1    16.6    +      -       +      +
    112B  LEU*     3.1    20.6    +      -       +      +
----------------------------------------------------------
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Residues in contact with ALA 109 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     68B  TYR*     3.7    17.0    -      -       +      -
     74B  VAL*     3.5    36.6    -      -       +      +
     89B  PHE*     5.7     0.2    -      -       +      -
    104B  PRO*     3.4    24.0    -      -       +      -
    105B  ILE      3.8     5.4    -      -       -      +
    106B  GLY*     3.6     4.5    +      -       -      +
    108B  LEU*     1.3    78.3    -      -       -      +
    110B  ASN*     1.3    56.7    +      -       -      +
    112B  LEU*     3.1     5.0    +      -       -      +
    113B  VAL*     2.8    31.2    +      -       -      +
----------------------------------------------------------
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Residues in contact with ASN 110 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    104B  PRO*     3.5    31.4    +      -       -      +
    105B  ILE      4.0     2.3    -      -       -      +
    106B  GLY      2.9    23.9    +      -       -      +
    107B  PRO*     4.0     6.5    -      -       +      +
    108B  LEU      3.4     0.2    -      -       -      -
    109B  ALA*     1.3    73.3    -      -       -      +
    111B  THR*     1.3    58.3    +      -       -      +
    113B  VAL*     3.8    11.3    -      -       -      +
    114B  THR*     3.1    26.3    +      -       -      -
----------------------------------------------------------
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Residues in contact with THR 111 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    107B  PRO      3.1    20.9    +      -       -      -
    108B  LEU*     3.1    10.3    +      -       -      +
    110B  ASN*     1.3    75.3    -      -       -      +
    112B  LEU*     1.3    68.7    +      -       +      +
    114B  THR*     3.1     7.7    +      -       -      +
    115B  LEU*     3.0    29.9    +      -       +      +
----------------------------------------------------------
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Residues in contact with LEU 112 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     64B  PHE*     3.9    15.7    -      -       +      -
     67B  ALA*     4.0    27.6    -      -       +      -
     68B  TYR*     3.5    39.3    -      -       +      +
     71B  CYS*     3.9    25.6    -      -       -      -
    108B  LEU      3.1    15.2    +      -       -      +
    109B  ALA      3.6     1.3    -      -       -      +
    111B  THR*     1.3    80.5    -      -       +      +
    113B  VAL*     1.3    55.1    +      -       -      +
    115B  LEU*     3.0    17.0    +      -       +      +
    116B  GLU*     2.6    36.3    +      -       -      +
----------------------------------------------------------
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Residues in contact with VAL 113 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     68B  TYR*     3.2    15.4    +      -       -      +
     89B  PHE*     4.1     9.2    -      -       +      -
     93B  THR*     3.9    23.4    -      -       +      +
    104B  PRO*     4.0    26.2    -      -       +      -
    109B  ALA      2.8    19.4    +      -       -      +
    110B  ASN*     3.8    11.4    -      -       +      +
    112B  LEU*     1.3    76.7    -      -       -      +
    114B  THR*     1.3    59.6    +      -       -      +
    116B  GLU*     3.2     1.8    +      -       -      +
    117B  ALA*     2.9    30.4    +      -       +      +
----------------------------------------------------------
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Residues in contact with THR 114 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    110B  ASN      3.1    14.2    +      -       -      -
    111B  THR*     3.1    11.5    +      -       -      +
    113B  VAL*     1.3    80.5    -      -       -      +
    115B  LEU*     1.3    63.9    +      -       -      +
    117B  ALA*     3.4     7.3    +      -       -      +
    118B  LEU*     3.3    20.1    +      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 115 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     64B  PHE*     4.2    11.4    -      -       +      -
    111B  THR*     3.0    16.4    +      -       +      +
    112B  LEU*     3.0    23.5    +      -       +      +
    114B  THR*     1.3    79.3    -      -       -      +
    116B  GLU*     1.3    61.1    +      -       -      +
    118B  LEU*     3.3    12.6    +      -       +      +
    119B  CYS*     3.1    33.9    +      -       -      -
----------------------------------------------------------
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Residues in contact with GLU 116 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     61B  ASN*     3.2     5.4    -      -       -      +
     64B  PHE*     3.5    35.4    -      -       +      +
     68B  TYR*     3.0    28.1    +      -       -      -
     90B  SER*     2.2    44.3    +      -       -      +
     93B  THR*     3.5    14.6    -      -       +      +
     94B  MET*     3.5    21.7    -      -       +      +
    112B  LEU      2.6    18.6    +      -       -      +
    113B  VAL      3.2     4.2    +      -       -      +
    115B  LEU*     1.3    70.7    -      -       -      +
    117B  ALA*     1.3    61.0    +      -       -      +
    119B  CYS*     3.4     2.1    +      -       +      +
    120B  GLY*     3.0    22.7    +      -       -      -
----------------------------------------------------------
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Residues in contact with ALA 117 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     93B  THR*     5.0    10.5    -      -       +      +
     94B  MET*     5.4     1.5    -      -       -      +
     96B  THR*     5.9     4.7    -      -       +      -
    113B  VAL*     2.9    18.7    +      -       +      +
    114B  THR*     3.5     9.2    -      -       -      +
    116B  GLU*     1.3    76.5    -      -       -      +
    118B  LEU*     1.3    66.1    +      -       -      +
    120B  GLY*     3.4     2.1    +      -       -      -
    121B  MET*     3.1    34.8    +      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 118 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    114B  THR      3.3     8.7    +      -       -      +
    115B  LEU*     3.3    16.0    +      -       +      +
    117B  ALA*     1.3    80.2    -      -       -      +
    119B  CYS*     1.3    59.2    +      -       -      +
    121B  MET*     3.0    12.0    +      -       +      +
    122B  LEU*     2.8    56.2    +      -       +      +
----------------------------------------------------------
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Residues in contact with CYS 119 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     60B  THR*     5.3     5.8    -      -       +      -
     64B  PHE*     4.1    17.9    -      -       +      -
     94B  MET*     4.8     8.1    -      -       +      -
    115B  LEU*     3.1    37.0    +      -       -      -
    116B  GLU*     3.7     9.0    -      -       -      +
    117B  ALA      3.2     0.2    -      -       -      -
    118B  LEU*     1.3    77.4    -      -       -      +
    120B  GLY*     1.3    57.1    +      -       -      +
    122B  LEU*     4.0     9.8    -      -       -      +
    123B  GLY*     2.7    30.0    +      -       -      -
----------------------------------------------------------
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Residues in contact with GLY 120 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    121A  MET*     4.4    11.3    -      -       -      +
     94B  MET*     3.6    35.4    -      -       -      +
    116B  GLU      3.0    13.2    +      -       -      -
    117B  ALA      3.4     1.8    +      -       -      -
    118B  LEU      3.3     0.2    -      -       -      -
    119B  CYS*     1.3    76.6    -      -       -      +
    121B  MET*     1.3    57.1    +      -       -      +
    123B  GLY*     3.8     1.1    -      -       -      -
    124B  LEU*     3.0    30.3    +      -       -      +
----------------------------------------------------------
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Residues in contact with MET 121 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    117B  ALA*     3.1    21.5    +      -       -      +
    118B  LEU*     3.0    16.2    +      -       +      +
    120B  GLY*     1.3    75.2    -      -       -      +
    122B  LEU*     1.3    67.0    +      -       +      +
    124B  LEU*     3.7     6.9    -      -       +      +
    125B  ALA*     3.0    23.7    +      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 122 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    118B  LEU*     2.8    51.2    +      -       +      +
    119B  CYS*     4.0     8.5    -      -       -      +
    121B  MET*     1.3    71.5    -      -       +      +
    123B  GLY*     1.3    52.1    +      -       -      +
    125B  ALA*     3.0     9.4    +      -       +      +
    126B  VAL*     2.6    43.1    +      -       +      +
----------------------------------------------------------
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Residues in contact with GLY 123 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    119B  CYS      2.7    22.3    +      -       -      -
    120B  GLY*     3.8     1.1    -      -       -      -
    122B  LEU*     1.3    73.3    -      -       -      +
    124B  LEU*     1.3    51.7    +      -       -      +
    126B  VAL*     3.4     7.0    +      -       -      +
    127B  ALA*     2.7    36.2    +      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 124 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    121A  MET*     3.8    51.6    -      -       +      +
    124A  LEU*     4.0    25.6    -      -       +      -
    125A  ALA*     4.6    11.9    -      -       +      -
    120B  GLY      3.0    18.2    +      -       -      +
    121B  MET*     3.7     7.2    -      -       +      +
    123B  GLY*     1.3    71.1    -      -       -      +
    125B  ALA*     1.3    69.1    +      -       -      +
    127B  ALA*     3.1     7.5    +      -       +      +
    128B  ALA*     2.9    25.7    +      -       +      +
----------------------------------------------------------
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Residues in contact with ALA 125 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    121B  MET      3.0    15.0    +      -       -      +
    122B  LEU*     3.3    13.5    -      -       +      +
    124B  LEU*     1.3    78.9    -      -       -      +
    126B  VAL*     1.3    63.1    +      -       +      +
    128B  ALA*     3.4     4.8    +      -       -      +
    129B  SER*     3.1    24.4    +      -       -      -
----------------------------------------------------------
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Residues in contact with VAL 126 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     53B  ILE*     6.3     0.4    -      -       +      -
    122B  LEU*     2.6    25.5    +      -       +      +
    123B  GLY*     3.7     6.5    -      -       -      +
    125B  ALA*     1.3    69.0    -      -       +      +
    127B  ALA*     1.3    69.4    +      -       -      +
    128B  ALA      3.0     2.1    +      -       -      -
    129B  SER*     3.0     9.5    +      -       -      -
    130B  LEU*     2.9    42.2    +      -       +      +
----------------------------------------------------------
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Residues in contact with ALA 127 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    122A  LEU*     5.1     6.7    -      -       +      -
    125A  ALA*     5.6     1.8    -      -       +      -
     49B  PHE*     4.7     1.5    -      -       +      -
     53B  ILE*     4.8    23.6    -      -       +      -
    123B  GLY      2.7    22.3    +      -       -      +
    124B  LEU*     3.1     9.8    +      -       +      +
    126B  VAL*     1.3    78.0    -      -       -      +
    128B  ALA*     1.3    60.3    +      -       -      +
    130B  LEU*     3.5     8.4    +      -       -      +
    131B  ILE*     3.2    36.0    +      -       +      +
----------------------------------------------------------
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Residues in contact with ALA 128 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    125A  ALA*     3.5    32.7    -      -       +      +
    128A  ALA*     6.1     2.2    -      -       +      -
    129A  SER*     4.4     2.1    +      -       -      +
    124B  LEU*     2.9    19.8    +      -       +      +
    125B  ALA*     3.9     4.5    -      -       -      +
    127B  ALA*     1.3    75.1    -      -       -      +
    129B  SER*     1.3    61.8    +      -       -      +
    131B  ILE*     3.4     2.0    +      -       -      +
    132B  TYR*     2.8    32.9    +      -       -      +
----------------------------------------------------------
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Residues in contact with SER 129 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    125B  ALA      3.1    15.4    +      -       -      -
    126B  VAL*     3.2    14.1    -      -       -      -
    128B  ALA*     1.3    76.2    -      -       -      +
    130B  LEU*     1.3    64.0    +      -       -      -
    132B  TYR*     3.4     4.5    +      -       -      +
    133B  ALA*     3.0    24.3    +      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 130 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     39B  HIS*     4.8    15.9    -      -       +      +
     41B  LEU*     3.9    38.4    -      -       +      +
     42B  LEU*     4.9    11.7    -      -       +      +
     49B  PHE*     3.9    27.4    -      -       +      -
     53B  ILE*     4.6    11.0    -      -       +      -
    126B  VAL*     2.9    36.8    +      -       +      +
    127B  ALA*     4.0     2.5    -      -       -      +
    129B  SER*     1.3    77.8    -      -       -      +
    131B  ILE*     1.3    59.1    +      -       -      +
    133B  ALA*     3.4     4.8    +      -       -      +
    134B  ARG*     2.9    35.8    +      -       +      +
----------------------------------------------------------
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Residues in contact with ILE 131 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    122A  LEU*     4.5    18.8    -      -       +      -
    125A  ALA*     4.0    18.8    -      -       +      +
    126A  VAL*     4.3    20.6    -      -       +      +
    129A  SER*     3.8    14.1    -      -       -      +
     46B  TRP*     4.1    14.4    -      -       +      -
     49B  PHE*     3.8    23.8    -      -       +      -
    127B  ALA*     3.2    19.8    +      -       +      +
    128B  ALA*     3.7     3.1    -      -       -      +
    130B  LEU*     1.3    74.4    -      -       -      +
    132B  TYR*     1.3    69.2    +      -       -      +
    134B  ARG*     3.2     2.1    +      -       -      +
    135B  PHE*     3.0    45.7    +      -       +      -
----------------------------------------------------------
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Residues in contact with TYR 132 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    129A  SER*     3.6    38.8    +      -       -      +
    132A  TYR*     3.4    40.4    -      +       +      -
    133A  ALA*     4.5    10.0    -      -       +      +
    136A  THR*     4.4     7.1    +      -       -      -
    128B  ALA      2.8    21.3    +      -       -      +
    129B  SER*     4.0     4.9    -      -       -      +
    131B  ILE*     1.3    74.5    -      -       -      +
    133B  ALA*     1.3    68.6    +      -       -      +
    135B  PHE*     3.2    20.1    -      +       +      +
    136B  THR*     3.3    38.1    -      -       +      +
----------------------------------------------------------
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Residues in contact with ALA 133 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     42B  LEU*     3.8    23.1    -      -       +      -
    129B  SER      3.0    17.3    +      -       -      +
    130B  LEU*     3.6     5.8    -      -       -      +
    132B  TYR*     1.3    80.8    -      -       -      +
    134B  ARG*     1.3    54.8    +      -       -      +
    136B  THR*     2.5    38.8    +      -       -      -
    137B  ARG*     3.3     7.1    +      -       -      +
----------------------------------------------------------
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Residues in contact with ARG 134 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     41B  LEU      3.0    25.7    +      -       -      -
     42B  LEU*     3.5    31.8    +      -       +      +
     44B  VAL*     2.6    35.1    +      -       -      +
     45B  SER*     3.4     0.6    -      -       -      +
     46B  TRP*     3.2    70.3    +      -       +      +
     49B  PHE*     3.7    24.5    -      -       -      -
    130B  LEU*     2.9    21.4    +      -       -      +
    131B  ILE      3.8     4.3    -      -       -      +
    133B  ALA*     1.3    75.9    -      -       -      +
    135B  PHE*     1.3    61.8    +      -       -      +
    136B  THR      3.2     1.4    +      -       -      -
    137B  ARG*     3.6    21.9    +      -       -      +
    138B  PRO*     5.6     0.3    -      -       -      +
----------------------------------------------------------
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Residues in contact with PHE 135 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     38A  TYR*     3.5    52.6    +      +       -      +
    126A  VAL*     4.4    18.6    -      -       +      -
    129A  SER*     4.0    29.2    -      -       -      -
    130A  LEU*     4.1    10.8    -      -       +      -
     46B  TRP*     3.2    35.9    -      +       -      -
    131B  ILE*     3.0    21.7    +      -       +      -
    132B  TYR*     3.2    15.9    -      +       +      +
    133B  ALA      2.9     0.2    -      -       -      -
    134B  ARG*     1.3    75.7    -      -       -      +
    136B  THR*     1.3    62.2    +      -       +      +
    137B  ARG      3.6     0.7    -      -       -      -
    138B  PRO*     4.3     8.7    -      -       -      +
    250B  PHE*     5.1     2.1    -      -       -      -
    252B  GLN*     3.8     5.4    -      -       -      +
----------------------------------------------------------
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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