Contacts of the helix formed by residues 98 - 122 (chain A) in PDB entry 2PGW


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 ILE 98 (chain A).
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     87A  PHE*     4.7     1.7    -      -       -      -
     91A  TYR*     3.7    27.4    -      -       +      -
     96A  ALA*     2.7    26.6    +      -       +      +
     97A  ASN*     1.3    72.9    -      -       -      +
     99A  MSE      1.3    59.2    +      -       -      +
    100A  ARG      3.4     2.7    -      -       -      -
    101A  ALA*     3.3    21.7    +      -       +      +
    102A  ALA*     2.9    24.1    +      -       -      +
     55G  PRO*     4.9     7.2    -      -       +      -
    100G  ARG*     3.6    20.2    -      -       +      +
    101G  ALA*     3.4    33.4    -      -       +      +
    104G  GLN*     3.8    22.2    -      -       +      +
    228G  TRP*     4.5     0.2    -      -       -      -
    251G  PHE*     4.9     4.5    -      -       +      -
----------------------------------------------------------
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Residues in contact with MSE 99 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     87A  PHE*     4.0    23.6    -      -       +      -
     97A  ASN      3.5     5.3    +      -       -      -
     98A  ILE*     1.3    74.8    -      -       -      +
    100A  ARG*     1.3    58.1    +      -       -      +
    102A  ALA*     3.2     1.3    +      -       -      +
    103A  ASN*     2.7    48.5    +      -       -      +
    252A  THR*     3.6    35.2    -      -       +      -
    253A  LEU*     5.2     1.6    -      -       -      -
    254A  TYR*     4.0    20.0    -      -       +      -
    100G  ARG*     5.3     1.6    -      -       -      +
    228G  TRP*     3.4    59.4    -      -       +      +
----------------------------------------------------------
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Residues in contact with ARG 100 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     98A  ILE      3.4     0.8    -      -       -      -
     99A  MSE      1.3    76.0    -      -       -      +
    101A  ALA*     1.3    63.6    +      -       -      +
    103A  ASN*     3.2    11.2    +      -       -      +
    104A  GLN*     3.1    20.8    +      -       -      +
    227A  SER      5.1     2.4    +      -       -      -
    228A  TRP*     3.4    23.1    -      -       -      -
    248A  GLN      4.0     5.9    +      -       -      -
    249A  ALA*     3.8    13.9    +      -       -      +
    251A  PHE*     3.3    40.2    -      -       +      +
    252A  THR*     3.9    11.2    -      -       +      +
    255A  ASP*     3.1    29.2    +      -       -      -
    273A  ARG      4.9     1.0    -      -       -      +
    274A  GLU      4.7     0.7    -      -       -      +
   2100A  GOL      4.1    16.2    +      -       -      -
     97G  ASN*     2.9    34.8    +      -       -      +
     98G  ILE*     3.6    19.5    -      -       +      +
     99G  MSE      5.3     1.3    -      -       -      +
----------------------------------------------------------
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Residues in contact with ALA 101 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     91A  TYR*     4.8     0.7    -      -       +      -
     98A  ILE*     3.3    19.6    +      -       +      +
    100A  ARG*     1.3    78.9    -      -       -      +
    102A  ALA*     1.3    63.1    +      -       -      +
    104A  GLN*     3.2    15.1    -      -       -      +
    105A  ILE*     3.1    22.5    -      -       +      +
     98G  ILE*     3.4    18.6    -      -       +      +
    101G  ALA*     3.5    31.4    -      -       +      -
----------------------------------------------------------
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Residues in contact with ALA 102 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     87A  PHE*     3.5    38.6    -      -       +      -
     91A  TYR*     3.8    25.7    +      -       +      -
     98A  ILE      2.9    12.9    +      -       -      +
     99A  MSE      3.2     3.1    +      -       -      +
    101A  ALA*     1.3    77.2    -      -       -      +
    103A  ASN*     1.3    65.1    +      -       -      +
    105A  ILE*     3.1     5.4    +      -       -      +
    106A  PHE*     2.9    32.7    +      -       +      -
----------------------------------------------------------
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Residues in contact with ASN 103 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     87A  PHE*     6.2     0.2    -      -       -      -
     99A  MSE      2.7    44.5    +      -       -      +
    100A  ARG*     3.4     4.4    -      -       -      +
    102A  ALA*     1.3    75.7    -      -       -      +
    104A  GLN*     1.3    57.6    +      -       -      +
    106A  PHE*     4.5     6.8    -      -       -      +
    107A  SER*     2.9    33.4    +      -       -      -
    251A  PHE      4.3     0.2    -      -       -      +
    252A  THR*     4.0    10.9    -      -       -      +
    273A  ARG      3.7     1.9    -      -       -      +
    274A  GLU      3.0    28.2    -      -       -      +
    275A  ILE*     3.2    22.0    +      -       -      +
    276A  GLY*     3.4    12.6    -      -       -      +
----------------------------------------------------------
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Residues in contact with GLN 104 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     51A  CYS*     3.7    17.2    -      -       -      +
     52A  THR*     3.2    46.4    +      -       -      +
     53A  VAL      4.0     0.6    -      -       -      -
     54A  ALA*     2.9    30.9    +      -       -      +
     60A  THR*     4.5     6.6    -      -       -      +
    100A  ARG      3.1    11.4    +      -       -      +
    101A  ALA*     3.2    15.0    -      -       -      +
    103A  ASN*     1.3    78.0    -      -       -      +
    105A  ILE*     1.3    63.9    +      -       +      +
    107A  SER*     3.8     8.7    -      -       -      -
    273A  ARG*     3.6    21.4    +      -       +      +
     96G  ALA*     4.1    10.6    -      -       -      +
     98G  ILE*     3.7    24.6    -      -       +      +
----------------------------------------------------------
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Residues in contact with ILE 105 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     51A  CYS*     3.2    22.4    -      -       +      -
     60A  THR*     5.0    12.6    -      -       +      +
     63A  ILE*     3.8    20.4    -      -       +      -
     64A  LEU*     3.4    36.1    -      -       +      +
     67A  LEU*     3.5    24.0    -      -       +      -
     91A  TYR*     3.2    24.0    -      -       -      +
    101A  ALA*     3.1    27.6    -      -       +      +
    102A  ALA      3.1     3.9    +      -       -      +
    104A  GLN*     1.3    82.6    -      -       +      +
    106A  PHE*     1.3    64.9    +      -       -      +
    107A  SER      3.1     3.2    +      -       -      -
    108A  GLY      3.2     2.4    +      -       -      -
    109A  ILE*     3.5     8.8    +      -       +      +
----------------------------------------------------------
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Residues in contact with PHE 106 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     67A  LEU*     4.0    15.3    -      -       +      -
     83A  ILE*     3.5    41.7    -      -       +      +
     86A  ILE*     3.9    24.7    -      -       +      -
     87A  PHE*     3.7    52.9    -      +       +      -
     91A  TYR*     4.2     4.7    -      +       -      -
    102A  ALA*     2.9    32.3    +      -       +      +
    103A  ASN*     4.2     9.0    -      -       -      +
    105A  ILE*     1.3    73.1    -      -       -      +
    107A  SER*     1.3    57.4    +      -       -      +
    109A  ILE*     3.7    17.9    -      -       +      +
    110A  ASP*     2.7    36.7    +      -       -      +
    276A  GLY*     3.6    10.5    -      -       -      +
----------------------------------------------------------
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Residues in contact with SER 107 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     50A  GLU      4.8     4.6    +      -       -      -
     51A  CYS*     6.0     0.4    -      -       -      -
    103A  ASN      2.9    15.4    +      -       -      -
    104A  GLN      3.8     9.6    -      -       -      -
    105A  ILE      3.1     0.2    -      -       -      -
    106A  PHE*     1.3    76.6    -      -       -      +
    108A  GLY*     1.3    57.8    +      -       -      +
    110A  ASP*     3.9     2.1    -      -       -      +
    111A  MSE      3.0    34.6    +      -       -      +
    272A  PRO*     3.0    41.7    +      -       -      +
    273A  ARG*     3.5     7.4    +      -       -      +
    276A  GLY      3.5    13.0    +      -       -      -
    277A  GLY*     3.6     1.9    -      -       -      +
----------------------------------------------------------
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Residues in contact with GLY 108 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     37A  ILE*     3.4    16.9    -      -       -      +
     49A  GLY*     3.7     0.2    -      -       -      -
     50A  GLU      3.4    28.0    +      -       -      -
     51A  CYS*     3.6    14.8    -      -       -      -
    105A  ILE      3.2     4.9    +      -       -      -
    107A  SER*     1.3    80.6    +      -       -      +
    109A  ILE*     1.3    61.0    +      -       -      +
    111A  MSE      3.2     5.1    -      -       -      +
    112A  ALA      3.1    18.7    +      -       -      -
----------------------------------------------------------
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Residues in contact with ILE 109 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     37A  ILE*     4.2    10.1    -      -       +      +
     39A  ILE*     3.9     4.9    -      -       +      +
     51A  CYS*     4.7     0.2    -      -       -      -
     64A  LEU*     3.8    23.1    -      -       +      -
     67A  LEU*     3.9    28.7    -      -       +      +
     68A  ALA*     4.0    14.4    -      -       +      +
     71A  LEU*     3.7    26.9    -      -       +      -
     83A  ILE*     4.3    16.4    -      -       +      -
     86A  ILE*     5.7     2.2    -      -       +      -
    105A  ILE*     3.5     6.0    +      -       +      +
    106A  PHE*     3.2    24.6    +      -       +      +
    108A  GLY*     1.3    73.0    -      -       -      +
    110A  ASP*     1.3    67.9    +      -       -      +
    112A  ALA*     3.3     4.2    +      -       -      +
    113A  MSE      3.0    31.7    +      -       +      +
----------------------------------------------------------
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Residues in contact with ASP 110 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     79A  VAL*     3.2    18.7    -      -       -      +
     83A  ILE*     4.0    13.4    -      -       +      +
    106A  PHE      2.7    21.2    +      -       -      +
    107A  SER      3.9     2.2    -      -       -      +
    109A  ILE*     1.3    72.3    -      -       -      +
    111A  MSE      1.3    65.3    +      -       -      +
    113A  MSE      3.2     1.4    +      -       -      +
    114A  TRP*     3.0    45.0    +      -       -      -
    276A  GLY      3.8     9.6    -      -       -      +
    277A  GLY*     4.0     2.7    -      -       -      -
    278A  ILE*     2.7    33.3    +      -       -      +
    279A  GLN*     3.1    17.1    +      -       -      +
    280A  PRO*     4.3     5.8    -      -       -      +
----------------------------------------------------------
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Residues in contact with MSE 111 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     48A  ILE      4.2     2.2    -      -       -      -
     49A  GLY*     3.8     3.1    -      -       -      -
     50A  GLU      3.8    25.1    -      -       -      +
    107A  SER*     3.0    21.5    +      -       -      +
    108A  GLY      3.2    10.3    -      -       -      +
    110A  ASP*     1.3    77.7    +      -       -      +
    112A  ALA*     1.3    57.7    +      -       -      +
    114A  TRP*     3.2     2.8    +      -       -      +
    115A  ASP*     3.0    27.2    +      -       -      +
    272A  PRO*     5.5     5.2    -      -       +      -
    278A  ILE*     4.0    15.9    -      -       +      +
    305A  ILE*     3.1    50.3    -      -       +      +
    306A  THR*     4.4    11.9    -      -       -      -
    309A  ALA*     3.3    27.8    -      -       +      -
    356A  LEU*     3.4    19.9    -      -       +      +
----------------------------------------------------------
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Residues in contact with ALA 112 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     37A  ILE*     3.9     5.2    -      -       +      +
     39A  ILE*     3.5    25.6    -      -       +      -
     47A  GLY*     3.4    15.8    -      -       -      +
     48A  ILE      3.7    14.7    +      -       -      +
     49A  GLY      3.6    16.4    -      -       -      +
    108A  GLY      3.1     6.9    +      -       -      +
    109A  ILE      3.7     2.7    -      -       -      +
    111A  MSE      1.3    78.8    -      -       -      +
    113A  MSE      1.3    57.9    +      -       -      +
    115A  ASP*     3.2     0.6    +      -       -      -
    116A  LEU*     2.8    30.8    +      -       -      +
----------------------------------------------------------
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Residues in contact with MSE 113 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
      6A  ILE*     3.6    24.7    -      -       +      -
     39A  ILE*     3.6    18.8    -      -       +      -
     71A  LEU*     4.0    10.8    -      -       +      -
     76A  PRO*     3.5    36.4    -      -       +      +
     79A  VAL*     3.8    32.3    -      -       +      -
     82A  LEU*     3.8    27.8    -      -       +      -
     83A  ILE*     6.5     0.2    -      -       +      -
    109A  ILE*     3.0    26.6    +      -       +      +
    110A  ASP      3.6     7.2    -      -       -      +
    112A  ALA*     1.3    76.9    -      -       -      +
    114A  TRP*     1.3    56.9    +      -       -      +
    116A  LEU*     3.3     5.7    +      -       -      +
    117A  GLN*     2.8    33.4    +      -       -      +
----------------------------------------------------------
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Residues in contact with TRP 114 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     79A  VAL*     3.8    13.8    -      -       +      +
    110A  ASP*     3.0    56.2    +      -       -      +
    113A  MSE      1.3    75.5    -      -       +      +
    115A  ASP*     1.3    61.9    +      -       -      +
    117A  GLN*     3.5    31.9    -      -       -      +
    118A  GLY      2.9    24.9    +      -       -      -
    125A  VAL*     3.7    19.3    -      -       +      +
    128A  LEU*     4.0    30.6    -      -       +      +
    129A  LEU*     4.5    20.2    -      -       +      -
    278A  ILE*     3.9    24.0    -      -       +      -
    279A  GLN*     3.5    35.9    -      -       +      +
    128B  LEU      4.3    12.6    -      -       -      -
    129B  LEU*     4.6     0.4    -      -       -      -
    130B  GLY*     4.1    17.7    -      -       -      -
----------------------------------------------------------
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Residues in contact with ASP 115 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     47A  GLY*     3.2     3.1    -      -       -      -
     48A  ILE*     2.8    27.6    +      -       -      +
    111A  MSE      3.0    13.9    +      -       -      +
    112A  ALA      3.4     7.6    -      -       -      +
    114A  TRP*     1.3    78.0    -      -       -      +
    116A  LEU*     1.3    62.9    +      -       -      +
    118A  GLY      3.3     0.2    +      -       -      -
    119A  LYS*     2.7    59.1    +      -       -      +
    125A  VAL*     4.4     0.6    -      -       -      +
    355A  GLY*     3.5     7.9    -      -       -      -
    356A  LEU*     2.8    44.3    +      -       +      +
    357A  GLY      4.4     0.9    +      -       -      -
    358A  PHE*     4.6     4.7    +      -       -      -
----------------------------------------------------------
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Residues in contact with LEU 116 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
      6A  ILE*     4.5     3.4    -      -       +      -
     39A  ILE*     3.8    30.5    -      -       +      +
     41A  ALA*     4.1    12.3    -      -       +      -
     45A  THR*     3.6    43.1    -      -       +      +
     47A  GLY*     3.8    11.2    -      -       -      +
     76A  PRO*     3.5    28.9    -      -       +      -
    112A  ALA      2.8    17.8    +      -       -      +
    113A  MSE      3.5     5.8    -      -       -      +
    115A  ASP*     1.3    77.8    -      -       -      +
    117A  GLN*     1.3    62.8    +      -       -      +
    119A  LYS*     3.2     4.3    +      -       -      +
    120A  LEU*     2.9    38.8    +      -       +      +
----------------------------------------------------------
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Residues in contact with GLN 117 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     76A  PRO*     3.1    28.7    +      -       +      +
     77A  HIS*     3.5    32.6    +      -       +      +
     79A  VAL*     3.7    15.0    -      -       -      +
    113A  MSE      2.8    20.1    +      -       -      +
    114A  TRP*     3.3    45.8    +      -       -      +
    116A  LEU*     1.3    75.3    -      -       -      +
    118A  GLY*     1.3    57.8    +      -       -      +
    120A  LEU*     3.4     8.8    +      -       -      +
    121A  ALA*     3.0    30.3    +      -       -      +
    128A  LEU*     3.9    11.8    -      -       +      +
    127B  GLN      4.0     9.9    -      -       -      +
    128B  LEU*     5.3     1.4    -      -       -      -
    130B  GLY*     5.5     0.4    +      -       -      -
----------------------------------------------------------
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Residues in contact with GLY 118 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    114A  TRP      2.9    11.1    +      -       -      -
    117A  GLN*     1.3    77.6    -      -       -      +
    119A  LYS*     1.3    51.2    +      -       -      +
    121A  ALA*     3.2     1.7    +      -       -      -
    122A  GLY*     2.6    31.9    +      -       -      -
    123A  LEU      2.9    24.5    +      -       -      -
    128A  LEU*     3.5    14.1    -      -       -      +
    355A  GLY*     3.4    16.7    +      -       -      -
----------------------------------------------------------
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Residues in contact with LYS 119 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     45A  THR*     3.6    24.3    +      -       +      +
     46A  VAL      2.9    25.5    +      -       -      +
     48A  ILE*     4.4    14.1    -      -       -      +
    115A  ASP*     2.7    48.1    +      -       -      +
    116A  LEU      3.7     1.3    -      -       -      +
    118A  GLY*     1.3    75.8    -      -       -      +
    120A  LEU*     1.3    62.3    +      -       -      +
    122A  GLY*     3.5     9.2    +      -       -      -
    354A  PRO*     4.0    27.1    -      -       +      +
    355A  GLY      3.6     0.2    -      -       -      +
    357A  GLY      5.9     0.4    -      -       -      +
    358A  PHE*     4.9    16.5    +      -       -      +
    359A  GLN*     5.9     3.6    -      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 120 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
      4A  VAL*     4.0    22.7    -      -       +      -
     43A  ASP*     3.5    18.6    -      -       -      +
     45A  THR*     3.4    30.7    -      -       -      +
     76A  PRO*     3.8    28.9    -      -       +      -
     77A  HIS*     4.4    12.8    -      -       +      +
    116A  LEU*     2.9    30.7    +      -       +      +
    117A  GLN*     3.7     4.0    -      -       -      +
    119A  LYS*     1.3    75.8    -      -       -      +
    121A  ALA*     1.3    60.3    +      -       -      +
    122A  GLY      3.8     0.2    +      -       -      -
----------------------------------------------------------
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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
----------------------------------------------------------
     77A  HIS*     6.2     1.6    -      -       +      -
    117A  GLN      3.0    18.0    +      -       -      +
    118A  GLY      3.9     1.8    -      -       -      +
    120A  LEU*     1.3    77.4    -      -       -      +
    122A  GLY*     1.3    64.0    +      -       -      +
    123A  LEU*     3.8    26.8    -      -       +      +
    128A  LEU*     4.5     9.0    -      -       +      -
    121B  ALA*     5.1    14.4    -      -       +      -
    123B  LEU*     6.1     3.1    -      -       +      -
----------------------------------------------------------
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Residues in contact with GLY 122 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    118A  GLY      2.6    13.2    +      -       -      -
    119A  LYS      3.5     8.1    +      -       -      -
    120A  LEU      3.4     2.8    -      -       -      -
    121A  ALA*     1.3    76.0    -      -       -      +
    123A  LEU*     1.3    64.0    +      -       -      +
    124A  PRO*     4.8     0.3    -      -       -      +
    354A  PRO*     4.0    21.3    -      -       -      +
----------------------------------------------------------
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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