Contacts of the helix formed by residues 109 - 136 (chain A) in PDB entry 1JT6


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 THR 109 (chain A).
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    106A  TYR*     3.2    27.4    +      -       -      +
    107A  TYR      4.6     0.2    -      -       -      -
    108A  LYS*     1.3    80.0    -      -       -      +
    110A  ASN*     1.3    62.4    +      -       -      +
    111A  SER*     3.5    24.7    -      -       -      +
    112A  ILE*     3.9    15.0    -      -       +      -
    113A  ASN*     2.9    31.1    +      -       -      +
----------------------------------------------------------
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Residues in contact with ASN 110 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    108A  LYS      4.4     7.9    +      -       -      -
    109A  THR*     1.3    75.1    -      -       -      +
    111A  SER*     1.3    67.0    +      -       -      +
    113A  ASN*     4.4     6.6    -      -       -      +
    114A  GLU*     3.0    27.4    +      -       -      +
----------------------------------------------------------
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Residues in contact with SER 111 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     48A  ASN*     5.5     1.4    +      -       -      -
    109A  THR*     3.5     9.5    -      -       -      +
    110A  ASN*     1.3    82.2    -      -       -      +
    112A  ILE*     1.3    79.1    +      -       -      +
    114A  GLU*     3.6     3.1    -      -       -      +
    115A  LYS*     3.4    37.3    +      -       -      +
----------------------------------------------------------
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Residues in contact with ILE 112 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     47A  GLU*     4.3    25.6    -      -       +      +
     48A  ASN*     5.8     3.1    -      -       -      +
     51A  LEU*     4.3    17.0    -      -       +      -
    102A  PHE*     3.8    16.2    -      -       +      -
    106A  TYR*     3.8    46.0    -      -       +      +
    109A  THR*     3.7    15.3    +      -       +      +
    110A  ASN      3.3     0.2    -      -       -      -
    111A  SER*     1.3    90.2    -      -       -      +
    113A  ASN*     1.3    65.2    +      -       -      +
    114A  GLU      3.0     2.3    +      -       -      -
    115A  LYS*     3.1     5.4    +      -       +      +
    116A  MET*     2.9    38.8    +      -       +      +
----------------------------------------------------------
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Residues in contact with ASN 113 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    103A  TYR*     3.8    31.4    +      -       -      -
    106A  TYR      4.2     0.6    +      -       -      -
    107A  TYR*     3.5    24.4    -      -       -      +
    109A  THR      2.9    24.8    +      -       -      +
    110A  ASN*     4.5     6.3    -      -       -      +
    112A  ILE*     1.3    73.8    -      -       -      +
    114A  GLU*     1.3    59.8    +      -       -      +
    116A  MET*     3.8    10.0    -      -       -      +
    117A  ASN*     3.0    38.3    +      -       -      +
    201A  DEQ      5.6     2.2    -      -       -      +
    164B  HIS      4.7     1.7    -      -       -      +
    165B  GLU*     3.6    26.4    -      -       -      +
----------------------------------------------------------
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Residues in contact with GLU 114 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    110A  ASN      3.0    22.1    +      -       -      +
    111A  SER*     3.6     4.3    -      -       -      +
    112A  ILE      3.0     0.2    +      -       -      -
    113A  ASN*     1.3    77.6    -      -       -      +
    115A  LYS*     1.3    77.7    +      -       -      +
    117A  ASN*     3.0    18.2    +      -       +      +
    118A  LYS*     3.3    37.0    +      -       -      +
----------------------------------------------------------
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Residues in contact with LYS 115 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     48A  ASN*     4.3    24.2    -      -       -      +
     51A  LEU*     3.5    33.7    -      -       +      -
    111A  SER*     3.5    26.7    -      -       -      +
    112A  ILE*     3.1     6.8    +      -       -      +
    114A  GLU*     1.3    91.7    -      -       -      +
    116A  MET*     1.3    62.5    +      -       -      +
    118A  LYS*     3.2    17.5    +      -       -      +
    119A  LEU*     3.3    15.4    +      -       -      +
----------------------------------------------------------
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Residues in contact with MET 116 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     51A  LEU*     4.0     9.6    -      -       +      -
     54A  LEU*     4.7     7.2    -      -       +      -
     99A  ILE*     5.9     0.9    -      -       +      -
    102A  PHE*     4.0    21.1    -      -       +      -
    103A  TYR*     3.5    36.3    -      -       +      -
    106A  TYR*     5.6     2.2    -      -       -      +
    107A  TYR*     5.7     0.4    -      -       -      -
    112A  ILE*     2.9    35.4    +      -       +      +
    113A  ASN*     3.9    14.4    -      -       -      +
    114A  GLU      3.2     0.2    -      -       -      -
    115A  LYS*     1.3    77.0    -      -       -      +
    117A  ASN*     1.3    57.7    +      -       -      +
    119A  LEU*     3.1    11.4    +      -       -      +
    120A  GLU*     2.9    28.2    +      -       -      +
    201A  DEQ      3.4    41.6    -      -       +      +
----------------------------------------------------------
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Residues in contact with ASN 117 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    113A  ASN*     3.0    24.1    +      -       -      +
    114A  GLU*     3.0    12.8    +      -       -      +
    116A  MET*     1.3    77.9    -      -       -      +
    118A  LYS*     1.3    60.3    +      -       -      +
    120A  GLU*     3.7    10.6    -      -       -      +
    121A  ASN*     2.7    53.8    +      -       -      +
    201A  DEQ      5.7     6.9    -      -       -      +
    165B  GLU*     3.5    44.1    +      -       -      +
    166B  GLN*     4.4     5.1    +      -       -      -
----------------------------------------------------------
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Residues in contact with LYS 118 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    114A  GLU*     3.3    42.7    +      -       -      +
    115A  LYS*     3.2    12.2    +      -       -      +
    116A  MET      3.2     0.6    -      -       -      -
    117A  ASN*     1.3    82.3    -      -       -      +
    119A  LEU*     1.3    66.1    +      -       +      +
    121A  ASN*     3.3    17.0    +      -       -      +
    122A  LYS*     3.0    31.4    +      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 119 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     51A  LEU*     4.3    15.7    -      -       +      +
     54A  LEU*     3.6    28.5    -      -       +      +
     55A  ASN*     3.3    38.4    -      -       -      +
     58A  GLU*     4.0    24.3    -      -       +      +
    115A  LYS      3.3    12.2    +      -       -      +
    116A  MET*     3.1    11.1    +      -       -      +
    118A  LYS*     1.3    82.2    -      -       +      +
    120A  GLU*     1.3    62.4    +      -       -      +
    122A  LYS*     2.9    24.9    +      -       +      +
    123A  TYR      3.2     8.7    +      -       -      -
    201A  DEQ      4.2    28.5    -      -       +      -
----------------------------------------------------------
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Residues in contact with GLU 120 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    116A  MET      2.9    15.4    +      -       -      +
    117A  ASN*     3.7    13.7    -      -       -      +
    119A  LEU*     1.3    75.3    -      -       -      +
    121A  ASN*     1.3    64.9    +      -       -      +
    123A  TYR*     2.9    25.5    +      -       -      +
    124A  ILE*     2.9    38.9    +      -       +      +
    153A  ALA*     5.0     0.5    -      -       -      +
    154A  ASN*     4.2     8.8    -      -       -      +
    157A  ASN*     3.4    25.2    +      -       -      -
    201A  DEQ      3.9    45.0    -      -       +      +
    162B  PHE*     5.3     2.9    -      -       -      +
----------------------------------------------------------
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Residues in contact with ASN 121 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    117A  ASN*     2.7    41.5    +      -       -      +
    118A  LYS*     3.5    19.2    +      -       -      +
    119A  LEU      3.2     0.2    -      -       -      -
    120A  GLU*     1.3    74.6    -      -       -      +
    122A  LYS*     1.3    61.5    +      -       -      +
    124A  ILE*     3.2    20.8    +      -       -      +
    125A  ASP*     3.0    31.0    +      -       -      +
    150A  LYS*     6.0     4.0    -      -       -      +
----------------------------------------------------------
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Residues in contact with LYS 122 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     55A  ASN*     4.4    18.1    +      -       -      +
     58A  GLU*     3.9    12.1    -      -       +      +
     59A  SER*     5.3     7.0    +      -       -      +
     62A  GLN*     3.4    36.9    +      -       -      +
    118A  LYS*     3.0    21.3    +      -       -      +
    119A  LEU*     2.9    18.9    +      -       +      +
    121A  ASN*     1.3    75.4    -      -       -      +
    123A  TYR*     1.3    63.5    +      -       -      +
    125A  ASP*     3.3    28.2    +      -       -      +
    126A  ALA*     3.9     3.5    +      -       -      +
----------------------------------------------------------
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Residues in contact with TYR 123 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     58A  GLU*     3.8    21.2    +      -       -      +
     61A  TRP*     4.2    14.6    -      +       -      -
     82A  TYR*     3.1    52.9    +      +       -      -
     86A  SER*     2.9    28.5    +      -       -      -
    119A  LEU      3.2     6.2    +      -       -      +
    120A  GLU*     2.9    32.1    +      -       -      +
    122A  LYS*     1.3    76.7    -      -       -      +
    124A  ILE*     1.3    62.9    +      -       -      +
    125A  ASP      3.4     0.7    +      -       -      -
    126A  ALA*     3.4     8.0    +      -       -      +
    127A  TYR*     3.3    29.7    +      +       -      -
    153A  ALA*     4.0    14.6    -      -       +      -
    156A  VAL*     3.9     7.4    -      -       -      +
    157A  ASN*     3.9    20.0    +      -       -      -
    201A  DEQ      6.5     0.9    -      +       -      -
----------------------------------------------------------
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Residues in contact with ILE 124 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    120A  GLU*     2.9    31.4    +      -       +      +
    121A  ASN*     3.6    25.8    -      -       -      +
    123A  TYR*     1.3    75.4    -      -       -      +
    125A  ASP*     1.3    67.6    +      -       -      +
    127A  TYR*     2.9    22.9    +      -       -      +
    128A  HIS*     3.3     8.4    +      -       +      +
    146A  ASN      5.3     0.2    -      -       -      +
    149A  SER*     3.9    27.8    -      -       -      +
    150A  LYS*     4.3    24.2    -      -       +      +
    153A  ALA*     3.6    22.4    -      -       +      -
    154A  ASN*     4.9     8.1    -      -       -      +
----------------------------------------------------------
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Residues in contact with ASP 125 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    121A  ASN*     3.0    22.6    +      -       -      +
    122A  LYS*     3.4    19.9    -      -       -      +
    123A  TYR      3.2     0.4    -      -       -      -
    124A  ILE*     1.3    78.9    -      -       -      +
    126A  ALA*     1.3    63.6    +      -       -      +
    128A  HIS*     2.8    25.2    +      -       +      +
    129A  VAL*     2.9    20.0    +      -       +      +
----------------------------------------------------------
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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
----------------------------------------------------------
     62A  GLN*     6.4     2.2    -      -       +      -
     65A  TRP*     4.0    16.6    +      -       +      +
     82A  TYR*     3.2    43.3    -      -       +      +
    122A  LYS      3.9     3.6    +      -       -      +
    123A  TYR      3.4     3.2    +      -       -      +
    124A  ILE      3.2     1.0    -      -       -      -
    125A  ASP*     1.3    78.4    -      -       -      +
    127A  TYR*     1.3    57.0    +      -       -      +
    129A  VAL*     3.6     8.0    +      -       -      +
    130A  ILE*     3.2    33.4    +      -       -      +
----------------------------------------------------------
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Residues in contact with TYR 127 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     79A  PHE*     3.7    29.8    -      +       -      -
     82A  TYR*     3.5    28.8    -      +       +      -
     83A  ASN*     2.6    33.7    +      -       -      -
    123A  TYR*     3.3    29.7    +      +       -      -
    124A  ILE      2.9    12.7    +      -       -      +
    126A  ALA*     1.3    75.1    -      -       -      +
    128A  HIS*     1.3    61.5    +      -       -      +
    130A  ILE*     3.4     6.4    +      -       +      +
    131A  PHE*     2.9    38.2    +      +       +      -
    149A  SER*     3.6    20.6    -      -       -      +
    152A  ALA*     3.8     9.6    -      -       +      -
    153A  ALA*     3.7    33.9    -      -       +      -
    156A  VAL*     3.7     8.3    -      -       -      +
----------------------------------------------------------
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Residues in contact with HIS 128 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    124A  ILE*     3.3     4.1    +      -       +      +
    125A  ASP*     2.8    24.2    +      -       -      +
    127A  TYR*     1.3    80.3    -      -       -      +
    129A  VAL*     1.3    61.4    +      -       +      +
    131A  PHE*     3.2     1.7    +      -       -      +
    132A  LYS*     2.9    35.5    +      -       +      +
    145A  VAL*     3.4    26.6    -      -       +      +
    146A  ASN*     3.7    34.3    +      -       -      -
    149A  SER*     3.2    16.5    +      -       -      +
    801A  SO4      3.8    36.2    +      -       -      -
----------------------------------------------------------
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Residues in contact with VAL 129 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     69A  GLN*     5.4     7.6    -      -       -      +
    125A  ASP*     2.9    20.0    +      -       +      +
    126A  ALA*     3.8     9.4    -      -       -      +
    128A  HIS*     1.3    79.5    -      -       +      +
    130A  ILE*     1.3    66.8    +      -       +      +
    132A  LYS*     4.7     4.5    -      -       -      -
    133A  GLU*     2.9    41.4    +      -       +      +
----------------------------------------------------------
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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
----------------------------------------------------------
     65A  TRP*     4.1    15.7    -      -       +      +
     69A  GLN*     6.0     0.7    -      -       -      +
     75A  ASN*     3.5    38.1    -      -       +      +
     78A  LYS*     3.9    22.7    -      -       +      +
     79A  PHE*     3.9    33.7    -      -       +      +
     82A  TYR*     4.4     8.7    -      -       +      -
    126A  ALA      3.2    22.5    +      -       -      +
    127A  TYR*     3.7     9.2    -      -       +      +
    128A  HIS      3.3     0.2    -      -       -      -
    129A  VAL*     1.3    80.3    -      -       +      +
    131A  PHE*     1.3    63.5    +      -       +      +
    134A  GLY      3.0    21.5    +      -       -      -
    140A  TRP*     3.4    14.3    -      -       +      -
----------------------------------------------------------
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Residues in contact with PHE 131 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     79A  PHE*     3.7    32.5    -      +       -      -
    127A  TYR*     2.9    28.7    +      -       +      +
    128A  HIS      3.8     2.7    -      -       -      +
    130A  ILE*     1.3    77.0    -      -       +      +
    132A  LYS*     1.3    64.7    +      -       -      +
    135A  ASN*     3.2    22.7    +      -       -      -
    140A  TRP*     3.2    27.4    +      +       -      -
    142A  ILE*     3.5    20.1    -      -       +      +
    145A  VAL*     3.9    16.3    -      -       +      +
    148A  VAL*     3.4    38.1    -      -       +      -
    149A  SER*     3.5    16.8    -      -       -      -
    152A  ALA*     4.2     7.0    -      -       +      -
    182A  PHE*     4.0     6.7    -      +       -      -
    183A  LEU*     4.5     2.9    -      -       +      -
    186A  LEU*     3.9    18.2    -      -       +      -
----------------------------------------------------------
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Residues in contact with LYS 132 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    128A  HIS*     2.9    26.7    +      -       +      +
    129A  VAL*     4.0     4.5    -      -       -      +
    131A  PHE*     1.3    75.5    -      -       -      +
    133A  GLU*     1.3    73.8    +      -       -      +
    135A  ASN*     2.8    24.7    +      -       -      +
    136A  LEU*     3.0    33.9    -      -       +      +
    145A  VAL*     4.4     6.9    -      -       +      +
    801A  SO4      2.7    50.5    +      -       -      +
----------------------------------------------------------
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Residues in contact with GLU 133 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     75A  ASN*     3.5    21.3    -      -       -      +
    129A  VAL*     2.9    36.4    +      -       +      +
    132A  LYS*     1.3    89.5    -      -       -      +
    134A  GLY*     1.3    60.4    +      -       -      +
    136A  LEU*     3.6    23.7    +      -       -      +
    137A  ASN*     2.9    33.7    +      -       -      +
----------------------------------------------------------
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Residues in contact with GLY 134 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     75A  ASN*     3.7    12.1    -      -       -      +
    130A  ILE      3.0    15.9    +      -       -      -
    132A  LYS      3.1     0.6    -      -       -      -
    133A  GLU*     1.3    74.0    -      -       -      +
    135A  ASN*     1.3    61.4    +      -       -      +
    137A  ASN      3.8     0.6    -      -       -      -
    138A  GLY      3.2     1.6    +      -       -      -
    139A  GLU*     2.7    37.2    +      -       -      +
    140A  TRP*     3.5    27.7    +      -       -      -
----------------------------------------------------------
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Residues in contact with ASN 135 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    131A  PHE      3.2     9.4    +      -       -      -
    132A  LYS*     2.8    13.9    +      -       -      +
    134A  GLY*     1.3    74.0    -      -       -      +
    136A  LEU*     1.3    60.2    +      -       +      +
    137A  ASN      2.7    14.1    +      -       -      -
    138A  GLY*     2.8    14.7    +      -       -      -
    140A  TRP*     3.1    23.7    +      -       -      +
    141A  SER*     3.3     3.4    +      -       -      +
    142A  ILE*     2.9    46.2    -      -       -      +
    145A  VAL*     3.8    14.7    -      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 136 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    132A  LYS*     3.0    34.0    +      -       +      +
    133A  GLU*     3.7    30.5    -      -       -      +
    135A  ASN*     1.3    79.4    -      -       +      +
    137A  ASN*     1.3    61.9    +      -       -      +
    138A  GLY      3.6     0.4    -      -       -      -
----------------------------------------------------------
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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