Contacts of the helix formed by residues 116 - 143 (chain B) in PDB entry 4TLG


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 116 (chain B).
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    112B  LEU*     4.3     1.3    -      -       -      -
    115B  ALA*     1.3    77.4    -      -       -      +
    117B  LYS*     1.3    66.0    +      -       -      +
    118B  GLN*     3.6    10.8    +      -       -      +
    119B  ASP*     3.1    34.0    +      -       -      +
    120B  MET*     3.1    22.5    +      -       -      +
    270B  LEU*     5.4     0.8    -      -       -      +
----------------------------------------------------------
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Residues in contact with LYS 117 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    112B  LEU*     3.8    19.2    -      -       +      +
    116B  SER*     1.3    72.4    -      -       -      +
    118B  GLN*     1.3    63.0    +      -       -      +
    120B  MET*     3.3     4.2    +      -       -      +
    121B  ILE*     2.9    25.1    +      -       +      +
    166B  PRO      5.7     0.4    -      -       -      +
    169B  GLU*     5.7     2.7    -      -       +      -
    170B  VAL*     3.8    24.9    -      -       +      +
    173B  GLN*     4.1    19.7    -      -       -      +
----------------------------------------------------------
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Residues in contact with GLN 118 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     66B  GLN*     4.6    16.2    +      -       -      +
    116B  SER*     3.1    10.7    +      -       -      +
    117B  LYS*     1.3    78.5    -      -       -      +
    119B  ASP*     1.3    61.0    +      -       -      +
    121B  ILE*     3.3     6.6    +      -       -      +
    122B  ARG*     2.8    47.1    +      -       +      +
----------------------------------------------------------
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Residues in contact with ASP 119 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     74B  TRP*     3.7    22.8    -      -       +      -
     77B  PRO*     3.3    28.1    -      -       +      +
     80B  ILE*     3.7    19.7    -      -       +      +
    116B  SER*     3.1    28.4    +      -       -      +
    118B  GLN*     1.3    81.1    -      -       -      +
    120B  MET*     1.3    60.8    +      -       -      +
    122B  ARG*     4.5     3.8    -      -       -      -
    123B  LYS*     3.0    27.9    +      -       -      +
----------------------------------------------------------
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Residues in contact with MET 120 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     80B  ILE*     4.1    15.7    -      -       +      -
     84B  ASP*     3.9    19.1    -      -       -      +
    106B  LEU*     5.1     1.8    -      -       +      -
    108B  PRO*     4.9    10.5    -      -       +      -
    111B  LEU*     3.9    30.7    -      -       +      -
    112B  LEU*     3.5    36.8    -      -       +      -
    115B  ALA*     5.0     2.9    -      -       +      -
    116B  SER      3.1    13.8    +      -       -      +
    117B  LYS*     3.6     8.3    -      -       -      +
    119B  ASP*     1.3    75.3    -      -       -      +
    121B  ILE*     1.3    62.2    +      -       -      +
    123B  LYS*     3.4     2.0    +      -       -      +
    124B  ARG*     2.9    53.6    +      -       -      +
    170B  VAL*     4.5    17.3    -      -       +      -
    171B  TYR*     6.1     0.4    -      -       +      -
----------------------------------------------------------
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Residues in contact with ILE 121 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     62B  PHE*     5.8     0.4    -      -       +      -
    117B  LYS*     2.9    25.0    +      -       +      +
    118B  GLN*     3.7     6.3    -      -       -      +
    120B  MET*     1.3    75.0    -      -       -      +
    122B  ARG*     1.3    59.6    +      -       +      +
    124B  ARG*     3.1     8.6    +      -       +      +
    125B  ILE*     2.9    36.3    +      -       +      +
    170B  VAL*     3.4    36.1    -      -       +      +
    173B  GLN*     3.8    23.6    -      -       +      +
    174B  PHE*     3.9    21.3    -      -       +      +
    177B  ILE*     3.5    26.5    -      -       +      -
----------------------------------------------------------
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Residues in contact with ARG 122 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     66B  GLN*     3.0    56.8    +      -       -      +
     67B  ASP*     5.7     1.6    -      -       -      +
     71B  ILE*     3.5    24.5    -      -       -      +
     74B  TRP*     3.6    57.1    -      -       +      +
    118B  GLN*     2.8    43.1    +      -       +      +
    119B  ASP*     4.5     6.5    -      -       -      -
    120B  MET      3.4     0.2    -      -       -      -
    121B  ILE*     1.3    70.8    -      -       +      +
    123B  LYS*     1.3    60.1    +      -       -      +
    125B  ILE*     4.2     9.6    -      -       +      -
    126B  LYS*     2.9    29.5    +      -       -      +
----------------------------------------------------------
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Residues in contact with LYS 123 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     74B  TRP*     3.6    11.3    -      -       +      -
     76B  PRO*     4.8     3.8    -      -       +      -
     80B  ILE*     3.8    23.6    -      -       +      -
     84B  ASP*     3.0    32.7    +      -       -      +
     85B  SER      2.7    27.7    +      -       -      -
     86B  GLY      6.1     0.2    -      -       -      -
     99B  TYR*     3.7    14.1    +      -       -      -
    119B  ASP      3.0    14.6    +      -       -      +
    120B  MET      3.6     7.9    -      -       -      +
    121B  ILE      3.3     0.4    -      -       -      -
    122B  ARG*     1.3    74.4    -      -       -      +
    124B  ARG*     1.3    81.6    +      -       +      +
    126B  LYS*     3.2     7.9    +      -       +      +
    127B  VAL*     3.1    32.4    +      -       +      +
    504B  EDO      4.3    16.8    +      -       -      +
----------------------------------------------------------
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Residues in contact with ARG 124 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     84B  ASP*     2.8    44.1    +      -       -      -
     85B  SER      5.5     0.2    +      -       -      -
    106B  LEU*     4.0    10.1    -      -       -      +
    120B  MET*     2.9    43.0    +      -       -      +
    121B  ILE*     3.1    10.6    +      -       -      +
    123B  LYS*     1.3    89.8    -      -       +      +
    125B  ILE*     1.3    64.2    +      -       -      +
    127B  VAL*     3.3    10.8    +      -       +      +
    128B  CYS*     3.2    25.8    +      -       -      -
    170B  VAL*     4.3    12.4    -      -       -      +
    171B  TYR*     3.3    43.6    +      -       +      +
    174B  PHE*     3.7    35.7    -      -       +      -
----------------------------------------------------------
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Residues in contact with ILE 125 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     62B  PHE*     3.9    29.2    -      -       +      -
     66B  GLN*     4.4    11.7    -      -       +      +
     68B  LEU*     3.5    30.1    -      -       +      -
     71B  ILE*     3.8     7.0    -      -       +      -
    121B  ILE*     2.9    34.9    +      -       +      +
    122B  ARG*     3.7    12.6    -      -       +      +
    124B  ARG*     1.3    72.3    -      -       -      +
    126B  LYS*     1.3    66.8    +      -       -      +
    128B  CYS*     3.0    11.9    +      -       -      +
    129B  GLU*     3.0    21.4    +      -       +      +
    174B  PHE*     5.7     3.1    -      -       +      -
    177B  ILE*     4.3    17.5    -      -       +      -
    182B  TYR*     3.6    14.8    -      -       +      +
----------------------------------------------------------
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Residues in contact with LYS 126 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     71B  ILE*     3.4    35.0    -      -       +      +
     72B  VAL*     3.6    23.3    +      -       -      +
     74B  TRP*     2.6    36.1    +      -       +      +
     75B  GLN*     4.3    10.7    +      -       -      +
     76B  PRO*     4.2     9.9    -      -       +      +
    122B  ARG      2.9    14.9    +      -       -      +
    123B  LYS*     3.3    11.4    -      -       -      +
    125B  ILE*     1.3    76.1    -      -       -      +
    127B  VAL*     1.3    58.1    +      -       -      +
    129B  GLU*     3.1     3.3    +      -       -      +
    130B  LEU*     2.8    46.4    +      -       +      +
    504B  EDO      4.0    21.0    +      -       -      +
----------------------------------------------------------
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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
----------------------------------------------------------
     88B  LEU*     4.7     1.3    -      -       +      -
     99B  TYR*     3.5    59.7    -      -       +      +
    123B  LYS*     3.1    20.6    +      -       -      +
    124B  ARG*     3.4    13.2    -      -       +      +
    125B  ILE      3.3     0.4    -      -       -      -
    126B  LYS*     1.3    75.3    -      -       -      +
    128B  CYS*     1.3    62.1    +      -       -      +
    130B  LEU*     3.3     9.0    +      -       -      +
    131B  LEU*     2.9    33.3    +      -       +      +
    151B  MET*     4.6     7.0    -      -       +      -
    504B  EDO      3.8    18.2    -      -       -      +
----------------------------------------------------------
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Residues in contact with CYS 128 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    124B  ARG      3.2    16.2    +      -       -      -
    125B  ILE*     3.0     9.9    +      -       -      +
    127B  VAL*     1.3    77.1    -      -       -      +
    129B  GLU*     1.3    57.7    +      -       -      +
    131B  LEU*     3.3     1.4    +      -       -      +
    132B  LEU*     3.0    26.8    +      -       -      +
    151B  MET*     5.2     2.9    -      -       -      -
    174B  PHE*     4.0    14.4    -      -       -      -
    178B  LEU*     3.8    28.0    -      -       -      -
    182B  TYR*     3.7    30.1    -      -       +      -
    505B  EDO      3.2    28.4    +      -       -      +
----------------------------------------------------------
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Residues in contact with GLU 129 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     63B  ARG*     3.1    37.7    +      -       -      -
     68B  LEU*     4.1     9.5    -      -       +      +
     71B  ILE*     3.6    29.4    -      -       +      -
     72B  VAL*     4.0     9.4    -      -       +      -
    125B  ILE*     3.0    10.7    +      -       +      +
    126B  LYS      3.1     6.7    +      -       -      +
    128B  CYS*     1.3    74.4    -      -       -      +
    130B  LEU*     1.3    59.4    +      -       -      +
    132B  LEU*     3.3    13.3    +      -       -      +
    133B  HIS*     2.9    46.8    +      -       -      -
    182B  TYR*     2.7    34.3    +      -       -      +
----------------------------------------------------------
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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
----------------------------------------------------------
     72B  VAL*     3.7    33.4    -      -       +      +
     88B  LEU*     4.2    20.4    -      -       +      +
    126B  LYS*     2.8    35.3    +      -       +      +
    127B  VAL*     3.7     4.3    -      -       -      +
    129B  GLU*     1.3    72.0    -      -       -      +
    131B  LEU*     1.3    57.7    +      -       -      +
    133B  HIS*     3.3     6.5    +      -       +      +
    134B  GLU*     3.0    29.1    +      -       -      +
    504B  EDO      3.5    37.5    -      -       -      -
----------------------------------------------------------
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Residues in contact with LEU 131 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     88B  LEU*     3.7    25.8    -      -       +      -
     97B  PRO*     3.9    18.3    -      -       +      +
     98B  VAL      4.5     0.2    -      -       -      -
     99B  TYR*     3.9    19.3    -      -       +      -
    127B  VAL*     2.9    36.9    +      -       +      +
    128B  CYS      3.6     4.3    -      -       -      +
    129B  GLU      3.3     0.2    -      -       -      -
    130B  LEU*     1.3    72.3    -      -       -      +
    132B  LEU*     1.3    61.9    +      -       -      +
    134B  GLU*     3.2     6.3    +      -       -      +
    135B  CYS*     2.9    32.4    +      -       -      -
    149B  ALA*     3.9    22.7    -      -       +      -
    151B  MET*     4.1     7.6    -      -       +      -
    505B  EDO      3.8    29.8    -      -       -      -
----------------------------------------------------------
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Residues in contact with LEU 132 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     40B  ARG*     6.0     0.9    -      -       -      +
     63B  ARG*     5.5     0.2    -      -       -      +
    128B  CYS      3.0    10.1    +      -       -      +
    129B  GLU*     3.3    19.7    +      -       -      +
    131B  LEU*     1.3    77.9    -      -       -      +
    133B  HIS*     1.3    62.8    +      -       +      +
    135B  CYS*     3.2    12.3    +      -       +      +
    136B  GLU*     3.0    21.8    +      -       -      +
    147B  GLU      5.3     6.7    -      -       -      +
    182B  TYR*     3.6    31.6    -      -       +      -
    185B  THR*     4.1    17.3    -      -       +      -
    505B  EDO      3.4    22.2    -      -       -      +
    508B  EDO      3.9    19.5    -      -       -      +
----------------------------------------------------------
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Residues in contact with HIS 133 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     68B  LEU      5.7     2.2    -      -       -      -
     69B  ASP*     5.5     5.3    +      -       -      -
     72B  VAL*     3.7    32.8    -      -       +      +
    129B  GLU*     2.9    38.1    +      -       -      +
    130B  LEU*     3.6    11.0    -      -       +      +
    131B  LEU      3.3     0.2    -      -       -      -
    132B  LEU*     1.3    76.3    -      -       +      +
    134B  GLU*     1.3    58.1    +      -       -      +
    136B  GLU*     3.2     7.9    +      -       +      +
    137B  LEU*     2.9    43.5    +      -       +      +
----------------------------------------------------------
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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
----------------------------------------------------------
     88B  LEU*     4.6    12.4    -      -       +      +
     91B  TYR*     2.6    42.8    +      -       +      +
     97B  PRO*     3.8    17.3    -      -       +      -
    130B  LEU      3.0    14.8    +      -       -      +
    131B  LEU*     3.2     9.8    +      -       -      +
    133B  HIS*     1.3    77.1    -      -       -      +
    135B  CYS*     1.3    55.3    +      -       -      +
    137B  LEU*     3.3    15.4    +      -       -      +
    138B  GLN*     3.0    36.2    +      -       -      +
    141B  LYS*     5.4     4.2    +      -       -      -
----------------------------------------------------------
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Residues in contact with CYS 135 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     97B  PRO*     3.7    12.8    -      -       -      -
    131B  LEU      2.9    19.2    +      -       -      -
    132B  LEU*     3.5    16.4    -      -       +      +
    134B  GLU*     1.3    76.6    -      -       -      +
    136B  GLU*     1.3    56.9    +      -       -      +
    138B  GLN*     3.5     2.5    +      -       -      +
    139B  THR*     2.9    32.8    +      -       -      -
    146B  ILE*     3.3    23.0    -      -       -      +
    147B  GLU*     4.1     4.9    -      -       -      -
    148B  MET*     3.5    40.6    -      -       -      -
    149B  ALA*     4.3     1.3    -      -       -      -
    505B  EDO      6.1     0.9    -      -       -      -
----------------------------------------------------------
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Residues in contact with GLU 136 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    132B  LEU      3.0    12.9    +      -       -      +
    133B  HIS*     3.2    11.6    +      -       +      +
    135B  CYS*     1.3    77.8    -      -       -      +
    137B  LEU*     1.3    63.7    +      -       +      +
    139B  THR*     3.3    17.7    +      -       -      +
    140B  GLN*     3.0    50.8    +      -       -      +
----------------------------------------------------------
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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  HIS*     2.9    41.5    +      -       +      +
    134B  GLU*     3.3    18.4    +      -       -      +
    136B  GLU*     1.3    81.5    -      -       +      +
    138B  GLN*     1.3    63.8    +      -       +      +
    140B  GLN*     3.3    21.0    +      -       -      +
    141B  LYS*     3.0    51.5    +      -       +      +
----------------------------------------------------------
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Residues in contact with GLN 138 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     91B  TYR*     3.6    34.4    +      -       +      +
     95B  GLY*     2.9    41.5    +      -       -      +
     97B  PRO*     5.1     0.9    -      -       +      -
    134B  GLU*     3.0    23.1    +      -       -      +
    135B  CYS*     3.8     4.3    -      -       -      +
    137B  LEU*     1.3    76.4    -      -       -      +
    139B  THR*     1.3    57.1    +      -       -      +
    141B  LYS*     4.4    18.7    +      -       -      +
    142B  LEU*     2.8    47.9    +      -       +      +
    146B  ILE*     4.1    14.4    -      -       +      -
----------------------------------------------------------
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Residues in contact with THR 139 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    135B  CYS      2.9    23.7    +      -       -      -
    136B  GLU*     3.5    22.8    +      -       -      +
    137B  LEU      3.3     0.2    -      -       -      -
    138B  GLN*     1.3    74.7    -      -       -      +
    140B  GLN*     1.3    58.9    +      -       -      +
    143B  GLY*     2.9    30.2    +      -       -      -
    144B  ARG      3.4    19.5    +      -       -      +
    145B  LYS*     3.8    14.0    -      -       +      -
    146B  ILE*     2.9    25.2    +      -       -      +
    147B  GLU*     5.4     0.3    -      -       -      +
----------------------------------------------------------
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Residues in contact with GLN 140 (chain B). Click here for Legend to table.
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                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    136B  GLU*     3.0    48.2    +      -       -      +
    137B  LEU*     3.3    23.7    +      -       -      +
    139B  THR*     1.3    77.7    -      -       -      +
    141B  LYS*     1.3    65.5    +      -       +      +
    143B  GLY*     3.8     6.2    +      -       -      -
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Residues in contact with LYS 141 (chain B). Click here for Legend to table.
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                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     91B  TYR*     5.9     0.6    +      -       -      -
    134B  GLU*     5.4     4.4    +      -       -      -
    137B  LEU*     3.0    44.2    +      -       +      +
    138B  GLN*     3.9    19.0    +      -       -      +
    139B  THR      3.3     0.2    -      -       -      -
    140B  GLN*     1.3    81.3    -      -       +      +
    142B  LEU*     1.3    66.3    +      -       +      +
    143B  GLY      3.8     0.2    +      -       -      -
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Residues in contact with LEU 142 (chain B). Click here for Legend to table.
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                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     94B  GLU      4.5     6.3    -      -       -      +
     95B  GLY*     4.8     2.2    -      -       -      -
    138B  GLN*     2.8    39.5    +      -       -      +
    141B  LYS*     1.3    82.9    -      -       +      +
    143B  GLY*     1.3    62.3    -      -       -      +
    144B  ARG*     3.5    45.5    +      -       -      +
    146B  ILE*     4.3    19.1    -      -       +      -
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Residues in contact with GLY 143 (chain B). Click here for Legend to table.
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                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    139B  THR*     2.9    12.9    +      -       -      -
    140B  GLN      3.8     4.4    +      -       -      -
    141B  LYS      3.4     2.8    +      -       -      -
    142B  LEU*     1.3    78.0    -      -       -      +
    144B  ARG*     1.3    62.0    +      -       -      +
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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