Contacts of the helix formed by residues 116 - 143 (chain A) 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 A).
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    112A  LEU*     4.2     3.6    -      -       -      -
    115A  ALA*     1.3    78.2    -      -       -      +
    117A  LYS*     1.3    63.9    +      -       -      +
    118A  GLN*     3.5    20.2    +      -       -      +
    119A  ASP*     3.0    36.2    +      -       -      +
    120A  MET*     3.1    25.3    +      -       -      +
----------------------------------------------------------
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Residues in contact with LYS 117 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    112A  LEU*     3.8    19.4    -      -       +      +
    116A  SER*     1.3    71.9    -      -       -      +
    118A  GLN*     1.3    71.1    +      -       -      +
    120A  MET*     3.2     4.1    +      -       -      +
    121A  ILE*     2.9    40.0    +      -       +      +
    166A  PRO      5.8     1.6    -      -       -      +
    169A  GLU*     5.4     4.9    -      -       +      +
    170A  VAL*     4.2    25.8    -      -       +      +
    173A  GLN*     3.4    33.0    +      -       -      +
----------------------------------------------------------
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Residues in contact with GLN 118 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    116A  SER*     3.1    20.1    -      -       -      +
    117A  LYS*     1.3    94.0    +      -       -      +
    119A  ASP*     1.3    61.0    +      -       -      +
    121A  ILE*     3.5     5.5    +      -       -      +
    122A  ARG*     2.9    29.9    +      -       -      +
----------------------------------------------------------
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Residues in contact with ASP 119 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     74A  TRP*     3.6    22.9    -      -       +      -
     77A  PRO*     3.3    28.4    -      -       +      +
     80A  ILE*     3.5    21.7    -      -       +      +
    115A  ALA*     5.0     0.2    -      -       -      +
    116A  SER*     3.0    28.7    +      -       -      +
    118A  GLN*     1.3    75.9    -      -       -      +
    120A  MET*     1.3    60.6    +      -       -      +
    122A  ARG*     4.3     3.2    -      -       -      -
    123A  LYS*     2.9    29.5    +      -       -      +
----------------------------------------------------------
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Residues in contact with MET 120 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     80A  ILE*     4.1    14.1    -      -       +      -
     84A  ASP*     4.0     7.4    -      -       -      +
    108A  PRO*     4.5    15.7    -      -       +      -
    111A  LEU*     3.8    35.2    -      -       +      +
    112A  LEU*     3.5    35.4    -      -       +      -
    115A  ALA*     5.4     0.7    -      -       +      -
    116A  SER      3.1    15.3    +      -       -      +
    117A  LYS*     3.6     8.5    -      -       -      +
    119A  ASP*     1.3    75.0    -      -       -      +
    121A  ILE*     1.3    63.0    +      -       -      +
    123A  LYS*     3.5     2.0    +      -       -      +
    124A  ARG*     2.8    62.4    +      -       -      +
    170A  VAL*     4.6    17.0    -      -       +      -
    171A  TYR*     6.1     0.2    -      -       +      -
----------------------------------------------------------
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Residues in contact with ILE 121 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    117A  LYS*     2.9    31.5    +      -       +      +
    118A  GLN*     3.9     5.8    -      -       -      +
    120A  MET*     1.3    73.7    -      -       -      +
    122A  ARG*     1.3    60.5    +      -       -      +
    124A  ARG*     3.0     7.7    +      -       -      +
    125A  ILE*     2.9    39.4    +      -       +      +
    170A  VAL*     3.5    36.8    -      -       +      +
    173A  GLN*     4.3    15.7    -      -       +      +
    174A  PHE*     4.0    22.9    -      -       +      +
    177A  ILE*     3.6    25.6    -      -       +      -
----------------------------------------------------------
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Residues in contact with ARG 122 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     66A  GLN*     2.8    56.1    +      -       -      +
     67A  ASP*     4.1    15.8    +      -       -      +
     68A  LEU*     4.5     0.4    -      -       -      +
     70A  ASN      5.6     0.2    -      -       -      -
     71A  ILE*     3.5    28.7    -      -       +      +
     74A  TRP*     3.5    51.2    -      -       +      +
    118A  GLN      2.9    19.3    +      -       -      +
    119A  ASP*     3.8     7.0    -      -       -      +
    121A  ILE*     1.3    76.4    -      -       -      +
    123A  LYS*     1.3    57.8    +      -       -      +
    125A  ILE*     3.4    11.1    +      -       +      +
    126A  LYS*     2.9    30.0    +      -       -      +
----------------------------------------------------------
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Residues in contact with LYS 123 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     74A  TRP*     3.7    10.9    -      -       +      -
     76A  PRO*     5.0     5.2    -      -       +      -
     80A  ILE*     3.9    24.0    -      -       +      +
     84A  ASP*     2.9    39.4    +      -       -      +
     85A  SER      2.7    29.4    +      -       -      -
     86A  GLY      6.1     0.2    -      -       -      -
     99A  TYR*     3.9    13.2    +      -       -      -
    119A  ASP      2.9    17.1    +      -       -      +
    120A  MET      3.6     4.9    -      -       -      +
    121A  ILE      3.2     0.2    -      -       -      -
    122A  ARG*     1.3    76.8    -      -       -      +
    124A  ARG*     1.3    72.2    +      -       +      +
    126A  LYS*     3.3     9.6    -      -       +      +
    127A  VAL*     3.1    32.3    +      -       +      +
    171A  TYR*     5.9     0.2    +      -       -      -
----------------------------------------------------------
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Residues in contact with ARG 124 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     84A  ASP*     2.9    42.4    +      -       -      -
    106A  LEU*     3.7    23.4    -      -       -      +
    120A  MET*     2.8    50.3    +      -       -      +
    121A  ILE*     3.0     8.7    +      -       -      +
    123A  LYS*     1.3    87.4    -      -       +      +
    125A  ILE*     1.3    64.6    +      -       -      +
    127A  VAL*     3.3    10.7    +      -       +      +
    128A  CYS*     3.1    24.8    +      -       -      -
    170A  VAL*     4.4     7.4    -      -       -      +
    171A  TYR*     3.2    37.5    +      -       +      +
    174A  PHE*     3.5    39.5    -      -       +      -
----------------------------------------------------------
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Residues in contact with ILE 125 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     62A  PHE*     3.7    31.4    -      -       +      -
     66A  GLN*     5.1     5.8    -      -       +      +
     68A  LEU*     3.5    32.1    -      -       +      -
     71A  ILE*     3.9     4.3    -      -       +      -
    121A  ILE*     2.9    35.4    +      -       +      +
    122A  ARG*     3.7    10.1    -      -       +      +
    124A  ARG*     1.3    72.1    -      -       -      +
    126A  LYS*     1.3    66.8    +      -       -      +
    128A  CYS*     3.1    11.5    +      -       -      +
    129A  GLU*     3.0    22.2    +      -       +      +
    174A  PHE*     5.1     3.1    -      -       +      -
    177A  ILE*     4.2    18.2    -      -       +      -
    182A  TYR*     3.5    18.6    -      -       +      +
----------------------------------------------------------
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Residues in contact with LYS 126 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     71A  ILE*     3.4    39.7    -      -       +      +
     72A  VAL*     3.7    19.0    +      -       -      +
     74A  TRP*     2.7    36.7    +      -       +      +
     75A  GLN*     4.1    12.7    +      -       -      +
     76A  PRO*     4.5     8.0    -      -       +      +
    122A  ARG      2.9    15.1    +      -       -      +
    123A  LYS*     3.3    13.2    -      -       +      +
    124A  ARG      3.3     0.2    -      -       -      -
    125A  ILE*     1.3    77.0    -      -       -      +
    127A  VAL*     1.3    57.0    +      -       +      +
    129A  GLU*     3.3     2.6    +      -       -      +
    130A  LEU*     2.8    53.7    +      -       +      +
----------------------------------------------------------
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Residues in contact with VAL 127 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     88A  LEU*     4.7     2.7    -      -       +      -
     99A  TYR*     3.5    55.2    -      -       +      +
    123A  LYS*     3.1    24.7    +      -       +      +
    124A  ARG*     3.4    11.7    -      -       -      +
    125A  ILE      3.3     0.2    -      -       -      -
    126A  LYS*     1.3    77.3    -      -       +      +
    128A  CYS*     1.3    58.7    +      -       -      +
    130A  LEU*     3.2    13.7    +      -       +      +
    131A  LEU*     2.9    40.2    +      -       +      +
    151A  MET*     6.3     0.9    -      -       -      -
----------------------------------------------------------
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Residues in contact with CYS 128 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    124A  ARG      3.1    19.2    +      -       -      -
    125A  ILE*     3.1     9.2    +      -       -      +
    127A  VAL*     1.3    78.9    -      -       -      +
    129A  GLU*     1.3    59.2    +      -       -      +
    131A  LEU*     3.3     1.5    +      -       -      -
    132A  LEU*     3.0    33.8    +      -       -      +
    174A  PHE*     3.9    15.0    -      -       -      -
    178A  LEU*     3.8    18.8    -      -       -      -
    182A  TYR*     3.8    24.7    -      -       +      -
    513A  EDO      3.4    32.3    -      -       -      -
----------------------------------------------------------
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Residues in contact with GLU 129 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     31A  PRO*     6.1     0.3    -      -       -      +
     63A  ARG*     2.8    42.6    +      -       -      -
     68A  LEU*     4.0     7.5    -      -       +      +
     71A  ILE*     3.7    25.8    -      -       +      -
     72A  VAL*     4.3    10.6    -      -       +      +
    125A  ILE*     3.0    18.4    +      -       +      +
    126A  LYS      3.7     6.5    -      -       -      +
    128A  CYS*     1.3    72.6    -      -       -      +
    130A  LEU*     1.3    59.9    +      -       -      +
    132A  LEU*     3.3    12.1    +      -       -      +
    133A  HIS*     3.0    28.9    +      -       -      +
    182A  TYR*     2.6    31.2    +      -       -      +
    502A  EDO      5.5     0.2    -      -       -      -
----------------------------------------------------------
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Residues in contact with LEU 130 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     72A  VAL*     3.7    32.1    -      -       +      +
     88A  LEU*     4.2    29.2    -      -       +      +
    126A  LYS*     2.8    45.8    +      -       +      +
    127A  VAL*     3.6     9.6    -      -       +      +
    129A  GLU*     1.3    71.6    -      -       -      +
    131A  LEU*     1.3    58.0    +      -       -      +
    133A  HIS*     3.4    13.0    +      -       +      +
    134A  GLU*     2.9    28.8    +      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 131 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     88A  LEU*     3.6    28.3    -      -       +      -
     97A  PRO*     4.0    15.7    -      -       +      +
     98A  VAL      4.6     1.3    -      -       -      +
     99A  TYR*     3.9    21.3    -      -       +      -
    127A  VAL*     2.9    36.5    +      -       +      +
    128A  CYS*     3.6     4.9    -      -       -      +
    129A  GLU      3.3     0.2    -      -       -      -
    130A  LEU*     1.3    77.0    -      -       -      +
    132A  LEU*     1.3    56.7    +      -       -      +
    134A  GLU*     3.2     5.3    +      -       -      +
    135A  CYS*     2.9    33.3    +      -       -      -
    149A  ALA*     4.0    25.8    -      -       +      -
    151A  MET*     5.0     8.1    -      -       +      -
    513A  EDO      3.8    22.4    -      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 132 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     40A  ARG*     5.0     3.4    -      -       -      +
    128A  CYS      3.0    17.0    +      -       -      +
    129A  GLU*     3.7    12.1    -      -       -      +
    131A  LEU*     1.3    72.7    -      -       -      +
    133A  HIS*     1.3    65.0    +      -       -      +
    135A  CYS*     3.2    11.0    +      -       +      +
    136A  GLU*     3.1    26.9    +      -       -      +
    147A  GLU      4.9     9.0    -      -       -      +
    148A  MET*     6.3     0.2    -      -       -      -
    182A  TYR*     3.7    23.6    -      -       +      -
    185A  THR*     4.0    16.6    -      -       +      -
    502A  EDO      3.4    36.8    -      -       -      +
    513A  EDO      3.9    17.5    -      -       -      +
----------------------------------------------------------
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Residues in contact with HIS 133 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     72A  VAL*     5.4     7.9    -      -       +      -
    129A  GLU      3.0    12.9    +      -       -      +
    130A  LEU*     3.5    15.5    -      -       +      +
    132A  LEU*     1.3    75.4    -      -       -      +
    134A  GLU*     1.3    61.4    +      -       -      +
    136A  GLU*     3.2    11.4    +      -       +      +
    137A  LEU*     3.0    66.9    +      -       +      +
----------------------------------------------------------
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Residues in contact with GLU 134 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     88A  LEU*     4.4    12.2    -      -       +      +
     91A  TYR*     2.4    34.0    +      -       +      -
     97A  PRO*     3.8    24.7    -      -       +      -
    130A  LEU      2.9    16.3    +      -       -      +
    131A  LEU*     3.2     7.6    +      -       -      +
    133A  HIS*     1.3    81.2    -      -       -      +
    135A  CYS*     1.3    55.7    +      -       -      +
    137A  LEU*     3.3    23.1    +      -       -      +
    138A  GLN*     2.9    38.3    +      -       -      +
    141A  LYS*     5.0     4.5    +      -       -      -
----------------------------------------------------------
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Residues in contact with CYS 135 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     97A  PRO*     3.8    14.1    -      -       -      -
    131A  LEU      2.9    19.8    +      -       -      -
    132A  LEU*     3.2    17.4    +      -       +      +
    134A  GLU*     1.3    75.7    -      -       -      +
    136A  GLU*     1.3    58.1    +      -       +      +
    138A  GLN*     3.4     3.5    +      -       -      +
    139A  THR*     2.9    32.7    +      -       -      -
    146A  ILE*     3.4    23.6    -      -       -      +
    147A  GLU      4.2     4.5    -      -       -      -
    148A  MET*     3.6    39.0    -      -       -      -
    149A  ALA*     4.4     1.6    -      -       -      -
    513A  EDO      5.5     0.9    -      -       -      -
----------------------------------------------------------
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Residues in contact with GLU 136 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     31A  PRO      5.1     2.2    -      -       -      +
     32A  ASN*     2.9    30.5    +      -       -      +
    132A  LEU      3.1    15.2    +      -       -      +
    133A  HIS*     3.2    12.5    +      -       -      +
    135A  CYS*     1.3    74.8    -      -       +      +
    137A  LEU*     1.3    66.5    +      -       -      +
    139A  THR*     3.3     8.2    +      -       -      +
    140A  GLN*     3.0    32.0    +      -       +      +
    145A  LYS*     3.6    11.8    +      -       -      -
    146A  ILE      6.0     0.2    -      -       -      -
    508A  EDO      3.0    21.2    +      -       -      -
----------------------------------------------------------
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Residues in contact with LEU 137 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    133A  HIS*     3.0    51.7    +      -       +      +
    134A  GLU*     3.7    28.0    -      -       -      +
    136A  GLU*     1.3    77.6    -      -       +      +
    138A  GLN*     1.3    57.1    +      -       -      +
    140A  GLN*     3.2     9.4    +      -       +      +
    141A  LYS*     2.9    53.8    +      -       -      +
----------------------------------------------------------
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Residues in contact with GLN 138 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     91A  TYR*     3.5    40.2    +      -       +      +
     95A  GLY*     2.8    39.0    +      -       -      +
     97A  PRO*     4.8     2.5    -      -       +      -
    134A  GLU*     2.9    23.7    +      -       -      +
    135A  CYS      3.6     4.5    -      -       -      +
    137A  LEU*     1.3    73.1    -      -       -      +
    139A  THR*     1.3    58.5    +      -       -      +
    141A  LYS*     3.9    21.2    +      -       -      +
    142A  LEU*     2.8    50.3    +      -       -      +
    146A  ILE*     3.9    13.5    -      -       +      -
----------------------------------------------------------
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Residues in contact with THR 139 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    135A  CYS      2.9    20.2    +      -       -      -
    136A  GLU*     3.4    13.8    -      -       -      -
    138A  GLN*     1.3    75.0    -      -       -      +
    140A  GLN*     1.3    63.9    +      -       -      +
    143A  GLY*     2.9    30.0    +      -       -      -
    144A  ARG*     3.3    20.5    +      -       -      +
    145A  LYS*     3.8    12.7    +      -       +      +
    146A  ILE*     2.9    25.0    +      -       -      +
    508A  EDO      3.9    29.4    -      -       -      +
----------------------------------------------------------
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Residues in contact with GLN 140 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    136A  GLU*     3.0    21.5    +      -       +      +
    137A  LEU*     3.2    12.1    +      -       +      +
    139A  THR*     1.3    79.9    -      -       -      +
    141A  LYS*     1.3    64.2    +      -       +      +
    143A  GLY*     3.9     5.9    +      -       -      -
    508A  EDO      4.3    23.2    +      -       -      -
----------------------------------------------------------
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Residues in contact with LYS 141 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     91A  TYR*     5.2     2.6    +      -       -      -
    134A  GLU*     5.0     6.5    +      -       -      -
    137A  LEU*     2.9    39.6    +      -       -      +
    138A  GLN*     3.8    23.8    +      -       -      +
    140A  GLN*     1.3    81.4    -      -       +      +
    142A  LEU*     1.3    65.1    +      -       +      +
    143A  GLY      3.5     0.6    +      -       -      -
----------------------------------------------------------
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Residues in contact with LEU 142 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     94A  GLU      4.0     4.5    -      -       -      +
     95A  GLY*     4.2     2.9    -      -       -      -
    138A  GLN*     2.8    42.8    +      -       -      +
    141A  LYS*     1.3    83.7    -      -       +      +
    143A  GLY*     1.3    62.3    +      -       -      +
    144A  ARG*     3.3    43.8    +      -       +      +
    146A  ILE*     4.0    20.6    -      -       +      -
----------------------------------------------------------
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Residues in contact with GLY 143 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    139A  THR*     2.9    12.4    +      -       -      -
    140A  GLN      3.9     5.3    +      -       -      -
    141A  LYS      3.5     2.4    -      -       -      -
    142A  LEU*     1.3    77.3    -      -       -      +
    144A  ARG*     1.3    59.1    +      -       -      +
----------------------------------------------------------
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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