Contacts of the helix formed by residues 119 - 147 (chain A) in PDB entry 3EUP


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 HIS 119 (chain A).
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     27A  LEU*     3.6    26.7    -      -       +      +
     54A  GLU*     3.2    45.4    +      -       +      +
     58A  ILE*     4.9     0.6    -      -       -      +
    115A  ALA*     2.8    27.4    +      -       +      +
    116A  ASP      5.2     0.2    +      -       -      -
    118A  THR*     1.3    85.1    +      -       -      +
    120A  ASP*     1.3    65.8    +      -       -      +
    121A  ALA*     3.5    12.5    -      -       -      +
    122A  LEU*     3.2    37.8    +      -       +      +
    123A  ARG*     3.0    18.7    +      -       -      +
----------------------------------------------------------
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Residues in contact with ASP 120 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    119A  HIS*     1.3    71.8    -      -       -      +
    121A  ALA*     1.3    64.6    +      -       -      +
    123A  ARG*     3.2    12.7    +      -       -      +
    124A  LYS*     2.9    61.1    +      -       +      +
    178B  LYS*     6.0     2.4    -      -       -      -
----------------------------------------------------------
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Residues in contact with ALA 121 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     54A  GLU*     4.3     9.0    -      -       -      +
     58A  ILE*     4.5    12.1    -      -       +      -
    119A  HIS*     3.4    17.0    -      -       -      +
    120A  ASP*     1.3    79.3    -      -       -      +
    122A  LEU*     1.3    62.7    +      -       -      +
    124A  LYS*     3.3    10.0    +      -       -      +
    125A  LYS*     3.1    25.8    +      -       +      +
----------------------------------------------------------
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Residues in contact with LEU 122 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     27A  LEU*     4.6     9.4    -      -       +      -
     54A  GLU      5.5     0.2    -      -       -      +
     57A  ALA*     4.5    21.1    -      -       +      +
     58A  ILE*     4.0    25.4    -      -       +      -
     61A  PHE*     4.2    21.1    -      -       +      -
    111A  THR*     3.9    23.4    -      -       +      +
    115A  ALA*     3.7    15.3    -      -       +      -
    119A  HIS*     3.2    35.6    -      -       +      +
    121A  ALA*     1.3    76.4    -      -       -      +
    123A  ARG*     1.3    65.0    +      -       -      +
    125A  LYS*     3.3    11.4    +      -       +      +
    126A  ALA*     3.0    21.7    +      -       -      +
----------------------------------------------------------
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Residues in contact with ARG 123 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    112A  THR*     5.5     1.8    -      -       +      +
    115A  ALA*     3.6    12.5    -      -       -      +
    116A  ASP*     3.7    25.6    -      -       +      +
    119A  HIS      3.0    13.8    +      -       -      +
    120A  ASP*     3.6    14.8    +      -       -      +
    122A  LEU*     1.3    75.8    -      -       -      +
    124A  LYS*     1.3   100.2    +      -       -      +
    126A  ALA*     3.0     7.2    +      -       -      +
    127A  GLY*     2.9    22.6    +      -       -      -
    175B  ARG      3.4    13.5    -      -       -      +
    176B  ALA*     2.8    40.6    +      -       -      +
    177B  THR*     3.7    16.2    +      -       -      +
    178B  LYS*     3.9    32.5    -      -       -      +
----------------------------------------------------------
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Residues in contact with LYS 124 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    120A  ASP*     2.9    45.1    +      -       +      +
    121A  ALA*     3.6     8.3    -      -       -      +
    122A  LEU      3.2     0.2    -      -       -      -
    123A  ARG*     1.3   103.5    -      -       -      +
    125A  LYS*     1.3    62.3    +      -       -      +
    127A  GLY*     3.3     0.9    +      -       -      -
    128A  GLU*     2.9    34.6    +      -       +      +
----------------------------------------------------------
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Residues in contact with LYS 125 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     58A  ILE*     3.6    25.8    -      -       +      +
     61A  PHE*     3.9    22.4    -      -       +      -
     62A  ASP*     2.7    43.2    +      -       -      -
    121A  ALA*     3.1    17.5    +      -       +      +
    122A  LEU*     3.6    16.6    -      -       +      +
    123A  ARG      3.2     0.4    -      -       -      -
    124A  LYS*     1.3    75.2    -      -       -      +
    126A  ALA*     1.3    57.8    +      -       -      +
    128A  GLU*     3.4    19.6    +      -       -      +
    129A  ALA*     2.9    27.9    +      -       -      +
----------------------------------------------------------
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Residues in contact with ALA 126 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     61A  PHE*     4.3     7.8    -      -       +      -
    108A  LEU*     4.6     6.5    -      -       +      +
    111A  THR*     4.5     5.8    -      -       +      -
    112A  THR*     3.4    35.9    -      -       -      +
    122A  LEU      3.0    13.3    +      -       -      +
    123A  ARG*     3.0     9.2    +      -       -      +
    125A  LYS*     1.3    78.9    -      -       -      +
    127A  GLY*     1.3    55.9    +      -       -      +
    129A  ALA*     3.2     8.6    +      -       -      +
    130A  ILE*     3.0    32.2    +      -       -      +
    176B  ALA*     4.3     5.4    -      -       +      -
----------------------------------------------------------
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Residues in contact with GLY 127 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    123A  ARG*     2.9    15.6    +      -       -      -
    124A  LYS      3.7     2.9    -      -       -      -
    126A  ALA*     1.3    73.7    -      -       -      +
    128A  GLU*     1.3    64.3    +      -       -      +
    130A  ILE*     3.3     2.4    +      -       -      +
    131A  LEU*     2.9    34.6    +      -       -      +
    176B  ALA*     3.3    24.8    +      -       -      -
    177B  THR*     4.3     7.2    -      -       -      -
----------------------------------------------------------
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Residues in contact with GLU 128 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    124A  LYS*     2.9    26.3    +      -       +      +
    125A  LYS*     3.7    21.4    -      -       -      +
    127A  GLY*     1.3    73.7    -      -       -      +
    129A  ALA*     1.3    57.2    +      -       -      +
    131A  LEU*     3.3     5.7    +      -       -      +
    132A  SER*     2.8    36.9    +      -       -      +
    135A  LYS*     5.6     0.2    +      -       -      -
----------------------------------------------------------
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Residues in contact with ALA 129 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     61A  PHE*     4.1    11.2    -      -       +      -
     65A  TRP*     3.5    40.5    +      -       +      +
    108A  LEU*     4.5     5.2    -      -       +      -
    125A  LYS      2.9    14.7    +      -       -      +
    126A  ALA*     3.2    10.1    +      -       -      +
    128A  GLU*     1.3    77.5    -      -       -      +
    130A  ILE*     1.3    62.1    +      -       -      +
    132A  SER*     3.8     5.3    -      -       -      -
    133A  TRP*     3.0    24.6    +      -       -      +
----------------------------------------------------------
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Residues in contact with ILE 130 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    108A  LEU*     3.5    39.5    -      -       +      -
    126A  ALA      3.0    17.2    +      -       -      +
    127A  GLY*     3.6     4.9    -      -       -      +
    129A  ALA*     1.3    76.6    -      -       -      +
    131A  LEU*     1.3    60.3    +      -       -      +
    133A  TRP*     3.4     5.5    +      -       +      +
    134A  LYS*     2.9    25.8    +      -       -      +
    161A  PHE*     4.4    17.3    -      -       +      -
    164A  ILE*     3.7    29.6    -      -       +      +
    172B  LEU*     5.2     2.9    -      -       +      -
    173B  ILE*     4.3    16.4    -      -       +      -
    176B  ALA*     4.1    13.0    -      -       +      -
    177B  THR*     4.0    20.9    -      -       +      -
----------------------------------------------------------
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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
----------------------------------------------------------
    127A  GLY*     2.9    23.6    +      -       -      +
    128A  GLU*     4.0     4.7    -      -       -      +
    130A  ILE*     1.3    73.8    -      -       -      +
    132A  SER*     1.3    59.6    +      -       -      +
    134A  LYS*     3.3     8.0    +      -       +      +
    135A  LYS*     2.9    50.1    +      -       -      +
    161A  PHE*     3.8    25.8    -      -       +      -
    177B  THR*     4.2    12.3    -      -       +      -
    182B  TYR*     3.8    41.1    -      -       +      +
----------------------------------------------------------
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Residues in contact with SER 132 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     65A  TRP*     6.1     0.7    -      -       -      -
     69A  LYS*     5.9     6.7    -      -       -      -
    128A  GLU*     2.8    24.3    +      -       -      +
    129A  ALA*     3.8     5.4    -      -       -      -
    131A  LEU*     1.3    69.9    -      -       -      +
    133A  TRP*     1.3    64.9    +      -       -      +
    135A  LYS*     3.4    15.4    +      -       -      +
    136A  ASN*     3.1    33.4    +      -       -      +
----------------------------------------------------------
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Residues in contact with TRP 133 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     65A  TRP*     3.8    28.3    -      +       +      -
     72A  LEU*     3.9    13.5    -      -       +      +
     89A  TYR*     3.0    46.9    +      +       -      -
    108A  LEU*     3.9    15.3    -      -       +      -
    129A  ALA      3.0    17.0    +      -       -      +
    130A  ILE*     3.6     4.3    -      -       +      +
    132A  SER*     1.3    74.4    -      -       -      +
    134A  LYS*     1.3    63.5    +      -       -      +
    136A  ASN*     3.2    12.5    +      -       +      +
    137A  LEU*     3.0    31.9    +      -       +      +
    163A  MET      5.6     0.4    -      -       -      -
    164A  ILE*     3.8    39.0    -      -       +      -
    167A  VAL*     4.1    17.9    -      -       +      -
    168A  GLU*     3.5    31.2    -      -       -      -
----------------------------------------------------------
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Residues in contact with LYS 134 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    130A  ILE      2.9    18.0    +      -       -      +
    131A  LEU*     3.5    11.4    -      -       +      +
    133A  TRP*     1.3    75.9    -      -       -      +
    135A  LYS*     1.3    68.6    +      -       +      +
    137A  LEU*     3.1     7.8    +      -       -      +
    138A  VAL*     2.9    41.7    +      -       +      +
    157A  THR*     2.9    52.2    +      -       -      +
    160A  ALA*     4.1     8.5    -      -       +      -
    161A  PHE*     3.6    29.9    -      -       +      -
    164A  ILE*     3.7    16.7    -      -       +      +
    182B  TYR*     6.4     0.2    -      -       -      -
----------------------------------------------------------
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Residues in contact with LYS 135 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    131A  LEU*     2.9    48.5    +      -       -      +
    132A  SER*     3.7    14.7    +      -       -      +
    133A  TRP      3.2     0.4    -      -       -      -
    134A  LYS*     1.3    81.2    -      -       +      +
    136A  ASN*     1.3    66.2    +      -       -      +
    138A  VAL*     2.6    30.0    -      -       +      +
    139A  THR*     3.0    13.9    +      -       -      -
----------------------------------------------------------
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Residues in contact with ASN 136 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     72A  LEU*     6.5     1.8    -      -       +      -
    132A  SER*     3.1    23.2    +      -       -      +
    133A  TRP*     3.4    13.8    -      -       +      +
    135A  LYS*     1.3    79.2    -      -       -      +
    137A  LEU*     1.3    63.6    +      -       +      +
    139A  THR*     3.2    10.0    +      -       -      +
    140A  ILE*     3.1    30.3    +      -       +      +
----------------------------------------------------------
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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
----------------------------------------------------------
     72A  LEU*     6.2     0.7    -      -       +      -
     85A  MET      5.8     0.2    -      -       -      +
     86A  LEU*     4.1     9.6    -      -       +      +
     89A  TYR*     3.2    26.7    -      -       +      +
    133A  TRP*     3.0    24.5    +      -       +      +
    134A  LYS      3.1     6.3    +      -       -      +
    136A  ASN*     1.3    78.1    -      -       +      +
    138A  VAL*     1.3    57.5    +      -       -      +
    140A  ILE*     3.1    14.3    +      -       +      +
    141A  ILE*     2.8    38.1    +      -       +      +
    160A  ALA*     3.4    33.7    -      -       +      +
    163A  MET*     3.7    31.9    -      -       +      -
    164A  ILE*     3.8    21.5    -      -       +      -
----------------------------------------------------------
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Residues in contact with VAL 138 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    134A  LYS*     2.9    44.2    +      -       +      +
    135A  LYS*     2.6    43.1    -      -       +      +
    137A  LEU*     1.3    75.2    -      -       -      +
    139A  THR*     1.3    57.1    +      -       -      +
    141A  ILE*     3.2     1.3    +      -       -      +
    142A  LYS*     2.9    46.5    +      -       -      +
    156A  VAL*     3.6    28.7    -      -       +      +
    157A  THR*     4.5     3.1    -      -       -      +
    160A  ALA*     3.7     7.9    -      -       +      -
----------------------------------------------------------
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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  LYS      3.0    16.0    +      -       -      -
    136A  ASN*     3.2    14.8    +      -       -      +
    138A  VAL*     1.3    75.2    -      -       -      +
    140A  ILE*     1.3    63.0    +      -       +      +
    142A  LYS*     3.6     6.9    +      -       -      +
    143A  LYS*     3.2    47.6    +      -       +      +
----------------------------------------------------------
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Residues in contact with ILE 140 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     72A  LEU*     5.7     4.0    -      -       +      -
     76A  VAL*     4.4    17.3    -      -       +      -
     82A  TYR*     3.9     7.1    -      -       +      +
     85A  MET*     3.0    51.8    -      -       +      +
     86A  LEU*     3.5    32.3    -      -       +      -
    136A  ASN*     3.1    20.2    +      -       +      +
    137A  LEU*     3.5    12.8    -      -       +      +
    139A  THR*     1.3    74.9    -      -       +      +
    141A  ILE*     1.3    66.6    +      -       -      +
    143A  LYS*     3.3    11.4    +      -       +      +
    144A  GLY*     3.0    18.7    +      -       -      -
----------------------------------------------------------
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Residues in contact with ILE 141 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     86A  LEU*     3.9    21.5    -      -       +      -
    137A  LEU*     2.8    34.2    +      -       +      +
    138A  VAL      3.8     3.6    -      -       -      +
    140A  ILE*     1.3    72.3    -      -       -      +
    142A  LYS*     1.3    57.4    +      -       -      +
    144A  GLY*     2.9     4.2    +      -       -      -
    145A  ILE*     2.8    30.9    +      -       +      +
    150A  PHE*     3.5    17.5    -      -       +      -
    154A  THR*     4.4     8.3    -      -       +      -
    156A  VAL*     3.8    44.4    -      -       +      +
    159A  ILE*     4.0    20.6    -      -       +      -
    160A  ALA*     4.2     7.9    -      -       +      -
    163A  MET*     4.5     3.4    -      -       -      -
    197A  ILE*     4.3    10.5    -      -       +      -
----------------------------------------------------------
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Residues in contact with LYS 142 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    138A  VAL*     2.9    34.5    +      -       -      +
    139A  THR*     3.9     6.1    -      -       -      +
    141A  ILE*     1.3    72.4    -      -       -      +
    143A  LYS*     1.3    62.9    +      -       -      +
    145A  ILE*     3.3    12.6    +      -       +      +
    146A  GLN*     3.1    27.2    +      -       -      +
    156A  VAL*     4.5    25.1    -      -       +      +
----------------------------------------------------------
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Residues in contact with LYS 143 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     82A  TYR*     3.5    33.7    -      -       +      +
     85A  MET*     5.8     0.7    -      -       +      -
    139A  THR*     3.2    36.8    +      -       -      +
    140A  ILE*     3.5    11.5    -      -       +      +
    142A  LYS*     1.3    73.7    -      -       -      +
    144A  GLY*     1.3    53.7    +      -       -      +
    146A  GLN*     3.2    25.8    -      -       -      +
    147A  ALA*     2.7    36.7    +      -       -      +
----------------------------------------------------------
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Residues in contact with GLY 144 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     82A  TYR*     3.7    19.4    -      -       -      -
    140A  ILE      3.0     7.3    +      -       -      -
    141A  ILE      2.9     7.8    +      -       -      -
    143A  LYS*     1.3    76.2    -      -       -      +
    145A  ILE*     1.3    59.7    +      -       -      +
    147A  ALA      3.4     0.5    +      -       -      -
    148A  LYS      3.2     2.3    +      -       -      -
    149A  GLU*     2.8    32.2    +      -       -      +
    150A  PHE*     3.1    24.9    +      -       -      -
----------------------------------------------------------
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Residues in contact with ILE 145 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    141A  ILE*     2.8    17.8    +      -       +      +
    142A  LYS*     3.5    12.6    -      -       +      +
    143A  LYS      3.2     0.2    -      -       -      -
    144A  GLY*     1.3    77.3    -      -       -      +
    146A  GLN*     1.3    57.5    +      -       +      +
    148A  LYS*     3.0    18.4    +      -       -      -
    150A  PHE*     3.4    17.8    -      -       +      +
    151A  ARG      3.1    24.2    -      -       -      +
    152A  PRO*     3.9    30.3    -      -       +      +
    154A  THR*     4.0    15.7    -      -       -      +
    156A  VAL*     4.1    19.3    -      -       +      -
----------------------------------------------------------
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Residues in contact with GLN 146 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     82A  TYR*     5.6     1.0    +      -       -      -
    142A  LYS*     3.1    13.4    +      -       -      +
    143A  LYS*     3.2    37.3    -      -       -      +
    145A  ILE*     1.3    77.7    -      -       +      +
    147A  ALA*     1.3    60.4    +      -       -      +
    148A  LYS*     3.2     3.0    +      -       -      +
----------------------------------------------------------
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Residues in contact with ALA 147 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     82A  TYR*     3.6    27.1    -      -       +      -
    143A  LYS      2.7    17.2    +      -       -      +
    144A  GLY      4.0     2.2    -      -       -      +
    145A  ILE      3.2     0.4    -      -       -      -
    146A  GLN*     1.3    77.4    -      -       +      +
    148A  LYS*     1.3    67.6    +      -       -      +
    149A  GLU*     3.1     9.4    +      -       +      +
----------------------------------------------------------
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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